import { z } from 'zod'

import { findCommonOpenapiSchemaProperties } from './openapi/find-common-openapi-schema-properties.js'
import { flattenOpenapiSchema } from './openapi/flatten-openapi-schema.js'
import {
  EventResourceSchema,
  OpenapiOperationSchema,
  PropertySchema,
  ResourceSchema,
} from './openapi/schemas.js'
import type {
  Openapi,
  OpenapiAuthMethod,
  OpenapiOperation,
  OpenapiPathItem,
  OpenapiPaths,
  OpenapiSchema,
} from './openapi/types.js'
import {
  type CodeSample,
  type CodeSampleDefinition,
  CodeSampleDefinitionSchema,
  createCodeSample,
  createResourceSample,
  type ResourceSample,
  type ResourceSampleDefinition,
  ResourceSampleDefinitionSchema,
  type SyntaxName,
} from './samples/index.js'
import {
  mapOpenapiToSeamAuthMethod,
  type SeamAuthMethod,
  type SeamWorkspaceScope,
} from './seam.js'

const paginationResponseKey = 'pagination'

export interface Blueprint {
  title: string
  routes: Route[]
  namespaces: Namespace[]
  resources: Resource[]
  pagination: Pagination | null
  events: EventResource[]
  actionAttempts: ActionAttempt[]
}

export interface Route {
  path: string
  name: string
  namespacePath: string | null
  endpoints: Endpoint[]
  parentPath: string | null
  isUndocumented: boolean
  isDeprecated: boolean
  isDraft: boolean
}

export interface Resource {
  resourceType: string
  properties: Property[]
  description: string
  routePath: string
  isDeprecated: boolean
  deprecationMessage: string
  isUndocumented: boolean
  undocumentedMessage: string
  isDraft: boolean
  draftMessage: string
  propertyGroups: PropertyGroup[]
  resourceSamples: ResourceSample[]
}

export interface PropertyGroup {
  name: string
  propertyGroupKey: string
}

export interface VariantGroup {
  name: string
  variantGroupKey: string
}

export interface Pagination {
  properties: Property[]
  description: string
  responseKey: string
}

export interface EventResource extends Resource {
  resourceType: 'event'
  eventType: string
}

export interface ActionAttempt extends Resource {
  resourceType: 'action_attempt'
  actionAttemptType: string
}

export interface Namespace {
  name: string
  path: string
  parentPath: string | null
  isDeprecated: boolean
  isUndocumented: boolean
  isDraft: boolean
}

export interface Endpoint {
  title: string
  path: string
  name: string
  parentPath: string | null
  description: string
  isDeprecated: boolean
  deprecationMessage: string
  isUndocumented: boolean
  undocumentedMessage: string
  isDraft: boolean
  draftMessage: string
  request: Request
  response: Response
  hasPagination: boolean
  codeSamples: CodeSample[]
  authMethods: SeamAuthMethod[]
  workspaceScope: SeamWorkspaceScope
}

interface BaseParameter {
  name: string
  description: string
  isRequired: boolean
  isDeprecated: boolean
  deprecationMessage: string
  isUndocumented: boolean
  undocumentedMessage: string
  isDraft: boolean
  draftMessage: string
  hasDefault: boolean
}

interface StringParameter extends BaseParameter {
  format: 'string'
  jsonType: 'string'
  default?: string | null
}

interface NumberParameter extends BaseParameter {
  format: 'number'
  jsonType: 'number'
  default?: number | null
}

interface EnumParameter extends BaseParameter {
  format: 'enum'
  jsonType: 'string'
  values: EnumValue[]
  default?: string | null
}

interface RecordParameter extends BaseParameter {
  format: 'record'
  jsonType: 'object'
}

interface BaseListParameter extends BaseParameter {
  format: 'list'
  jsonType: 'array'
}

type ListParameter =
  | StringListParameter
  | NumberListParameter
  | BooleanListParameter
  | DatetimeListParameter
  | IdListParameter
  | EnumListParameter
  | ObjectListParameter
  | RecordListParameter
  | DiscriminatedListParameter

interface StringListParameter extends BaseListParameter {
  itemFormat: 'string'
  default?: string[]
}

interface NumberListParameter extends BaseListParameter {
  itemFormat: 'number'
  default?: number[]
}

interface BooleanListParameter extends BaseListParameter {
  itemFormat: 'boolean'
  default?: boolean[]
}

interface DatetimeListParameter extends BaseListParameter {
  itemFormat: 'datetime'
  default?: string[]
}

interface IdListParameter extends BaseListParameter {
  itemFormat: 'id'
  default?: string[]
}

interface EnumListParameter extends BaseListParameter {
  itemFormat: 'enum'
  itemEnumValues: EnumValue[]
  default?: EnumValue[]
}

interface ObjectListParameter extends BaseListParameter {
  itemFormat: 'object'
  itemParameters: Parameter[]
}

interface RecordListParameter extends BaseListParameter {
  itemFormat: 'record'
}

interface DiscriminatedListParameter extends BaseListParameter {
  itemFormat: 'discriminated_object'
  discriminator: string
  variants: Array<{
    parameters: Parameter[]
    description: BaseParameter['description']
  }>
}

interface BooleanParameter extends BaseParameter {
  format: 'boolean'
  jsonType: 'boolean'
  default?: boolean | null
}

interface ObjectParameter extends BaseParameter {
  format: 'object'
  jsonType: 'object'
  parameters: Parameter[]
}

interface DatetimeParameter extends BaseParameter {
  format: 'datetime'
  jsonType: 'string'
  default?: string | null
}

interface IdParameter extends BaseParameter {
  format: 'id'
  jsonType: 'string'
  default?: string | null
}

export type Parameter =
  | StringParameter
  | NumberParameter
  | EnumParameter
  | RecordParameter
  | ListParameter
  | BooleanParameter
  | ObjectParameter
  | DatetimeParameter
  | IdParameter

export interface Request {
  methods: Method[]
  semanticMethod: Method
  preferredMethod: Method
  parameters: Parameter[]
}

export type Response = VoidResponse | ResourceResponse | ResourceListResponse

interface BaseResponse {
  description: string
}

interface VoidResponse extends BaseResponse {
  responseType: 'void'
}

interface ResourceResponse extends BaseResponse {
  responseType: 'resource'
  responseKey: string
  resourceType: string
  actionAttemptType: string | null
  batchResourceTypes: Array<{ batchKey: string; resourceType: string }> | null
}

interface ResourceListResponse extends BaseResponse {
  responseType: 'resource_list'
  responseKey: string
  resourceType: string
}

interface BaseProperty {
  name: string
  description: string
  isDeprecated: boolean
  deprecationMessage: string
  isUndocumented: boolean
  undocumentedMessage: string
  isDraft: boolean
  draftMessage: string
  propertyGroupKey: string | null
}

export type Property =
  | StringProperty
  | NumberProperty
  | EnumProperty
  | RecordProperty
  | ListProperty
  | ObjectProperty
  | BooleanProperty
  | DatetimeProperty
  | IdProperty
  | BatchResourceProperty

interface StringProperty extends BaseProperty {
  format: 'string'
  jsonType: 'string'
}

interface NumberProperty extends BaseProperty {
  format: 'number'
  jsonType: 'number'
}

export interface EnumProperty extends BaseProperty {
  format: 'enum'
  jsonType: 'string'
  values: EnumValue[]
}

type EnumValue = BaseProperty

interface RecordProperty extends BaseProperty {
  format: 'record'
  jsonType: 'object'
}

interface BaseListProperty extends BaseProperty {
  format: 'list'
  jsonType: 'array'
}

interface StringListProperty extends BaseListProperty {
  itemFormat: 'string'
}

interface NumberListProperty extends BaseListProperty {
  itemFormat: 'number'
}

interface BooleanListProperty extends BaseListProperty {
  itemFormat: 'boolean'
}

interface DatetimeListProperty extends BaseListProperty {
  itemFormat: 'datetime'
}

interface IdListProperty extends BaseListProperty {
  itemFormat: 'id'
}

interface BatchResourceProperty extends BaseProperty {
  format: 'record'
  jsonType: 'object'
  resourceType: string
}

interface EnumListProperty extends BaseListProperty {
  itemFormat: 'enum'
  itemEnumValues: EnumValue[]
}

interface ObjectListProperty extends BaseListProperty {
  itemFormat: 'object'
  itemProperties: Property[]
}

interface RecordListProperty extends BaseListProperty {
  itemFormat: 'record'
}

export interface DiscriminatedListProperty extends BaseListProperty {
  itemFormat: 'discriminated_object'
  discriminator: string
  variantGroups: VariantGroup[]
  variants: Array<{
    resourceType: string | null
    variantGroupKey: string | null
    properties: Property[]
    description: BaseProperty['description']
  }>
}

type ListProperty =
  | StringListProperty
  | NumberListProperty
  | BooleanListProperty
  | DatetimeListProperty
  | IdListProperty
  | EnumListProperty
  | ObjectListProperty
  | RecordListProperty
  | DiscriminatedListProperty

interface BooleanProperty extends BaseProperty {
  format: 'boolean'
  jsonType: 'boolean'
}

interface ObjectProperty extends BaseProperty {
  format: 'object'
  jsonType: 'object'
  properties: Property[]
  propertyGroups: PropertyGroup[]
}

interface DatetimeProperty extends BaseProperty {
  format: 'datetime'
  jsonType: 'string'
}

interface IdProperty extends BaseProperty {
  format: 'id'
  jsonType: 'string'
}

export type Method = 'GET' | 'POST' | 'PUT' | 'DELETE' | 'PATCH'

interface Context extends Required<BlueprintOptions> {
  codeSampleDefinitions: CodeSampleDefinition[]
  resourceSampleDefinitions: ResourceSampleDefinition[]
  validActionAttemptTypes: string[]
  validResourceTypes: string[]
  schemas: Record<string, unknown>
}

export const TypesModuleSchema = z.object({
  codeSampleDefinitions: z.array(CodeSampleDefinitionSchema).default([]),
  resourceSampleDefinitions: z
    .array(ResourceSampleDefinitionSchema)
    .default([]),
  // TODO: Import and use openapi zod schema here
  openapi: z.any(),
  schemas: z.record(z.string(), z.unknown()).optional().default({}),
})

export type TypesModuleInput = z.input<typeof TypesModuleSchema>

export type TypesModule = z.output<typeof TypesModuleSchema>

export interface BlueprintOptions {
  formatCode?: (content: string, syntax: SyntaxName) => Promise<string>
}

export const createBlueprint = async (
  typesModule: TypesModuleInput,
  { formatCode = async (content) => content }: BlueprintOptions = {},
): Promise<Blueprint> => {
  const { schemas, codeSampleDefinitions, resourceSampleDefinitions } =
    TypesModuleSchema.parse(typesModule)

  // TODO: Move openapi to TypesModuleSchema
  const openapi = typesModule.openapi as Openapi

  const validActionAttemptTypes = extractValidActionAttemptTypes(
    openapi.components.schemas,
  )
  const validResourceTypes = extractValidResourceTypes(
    openapi.components.schemas,
  )

  const context: Context = {
    codeSampleDefinitions,
    resourceSampleDefinitions,
    formatCode,
    schemas,
    validActionAttemptTypes,
    validResourceTypes,
  }

  const routes = await createRoutes(openapi.paths, context)
  const namespaces = createNamespaces(routes)

  const pagination = openapi.components.schemas[paginationResponseKey]
  const openapiSchemas = Object.fromEntries(
    Object.entries(openapi.components.schemas).filter(
      ([k]) => k !== paginationResponseKey,
    ),
  )

  const resources = await createResources(openapiSchemas, routes, context)
  const actionAttempts = await createActionAttempts(
    openapi.components.schemas,
    routes,
    context,
  )
  const events = await createEvents(openapiSchemas, routes, context)

  assertSeamPathsAreUndocumented({
    routes,
    namespaces,
    resources,
    events,
    actionAttempts,
  })

  assertDocumentedEndpointsDontReferenceUndocumentedResources({
    routes,
    resources,
  })

  return {
    title: openapi.info.title,
    routes,
    namespaces,
    resources,
    pagination: createPagination(pagination, openapiSchemas),
    events,
    actionAttempts,
  }
}

const isSeamPath = (path: string): boolean =>
  path === '/seam' || path.startsWith('/seam/')

const assertSeamPathsAreUndocumented = ({
  routes,
  namespaces,
  resources,
  events,
  actionAttempts,
}: Pick<
  Blueprint,
  'routes' | 'namespaces' | 'resources' | 'events' | 'actionAttempts'
>): void => {
  const offenders = [
    ...routes.flatMap((route) => {
      const routeOffenders =
        isSeamPath(route.path) && !route.isUndocumented
          ? [`route ${route.path}`]
          : []
      const endpointOffenders = route.endpoints.flatMap((endpoint) =>
        isSeamPath(endpoint.path) && !endpoint.isUndocumented
          ? [`endpoint ${endpoint.path}`]
          : [],
      )

      return [...routeOffenders, ...endpointOffenders]
    }),
    ...namespaces.flatMap((namespace) =>
      isSeamPath(namespace.path) && !namespace.isUndocumented
        ? [`namespace ${namespace.path}`]
        : [],
    ),
    ...resources.flatMap((resource) =>
      isSeamPath(resource.routePath) && !resource.isUndocumented
        ? [`resource ${resource.routePath}`]
        : [],
    ),
    ...events.flatMap((event) =>
      isSeamPath(event.routePath) && !event.isUndocumented
        ? [`event ${event.routePath}`]
        : [],
    ),
    ...actionAttempts.flatMap((actionAttempt) =>
      isSeamPath(actionAttempt.routePath) && !actionAttempt.isUndocumented
        ? [`action_attempt ${actionAttempt.routePath}`]
        : [],
    ),
  ]

  if (offenders.length > 0) {
    throw new Error(
      `All /seam entries must be marked undocumented. Found: ${offenders.join(', ')}`,
    )
  }
}

const assertDocumentedEndpointsDontReferenceUndocumentedResources = ({
  routes,
  resources,
}: Pick<Blueprint, 'routes' | 'resources'>): void => {
  const undocumentedResourceTypes = new Set(
    resources.filter((r) => r.isUndocumented).map((r) => r.resourceType),
  )

  const offenders: string[] = []

  for (const route of routes) {
    for (const endpoint of route.endpoints) {
      if (endpoint.isUndocumented) continue
      if (endpoint.response.responseType === 'void') continue
      if (!('resourceType' in endpoint.response)) continue

      const { resourceType } = endpoint.response
      if (undocumentedResourceTypes.has(resourceType)) {
        offenders.push(
          `${endpoint.path} references undocumented resource '${resourceType}'`,
        )
      }
    }
  }

  if (offenders.length > 0) {
    throw new Error(
      `Documented endpoints must not reference undocumented resources. Found:\n${offenders.join('\n')}`,
    )
  }
}

const extractValidActionAttemptTypes = (
  schemas: Openapi['components']['schemas'],
): string[] => {
  const actionAttemptSchema = schemas['action_attempt']
  if (
    actionAttemptSchema == null ||
    typeof actionAttemptSchema !== 'object' ||
    !('oneOf' in actionAttemptSchema) ||
    !Array.isArray(actionAttemptSchema.oneOf)
  ) {
    return []
  }

  const processedActionAttemptTypes = new Set<string>()
  actionAttemptSchema.oneOf.forEach((schema) => {
    const actionType = schema.properties?.['action_type']?.enum?.[0]
    if (typeof actionType === 'string') {
      processedActionAttemptTypes.add(actionType)
    }
  })

  return Array.from(processedActionAttemptTypes)
}

const extractValidResourceTypes = (
  schemas: Openapi['components']['schemas'],
): string[] => {
  return Object.keys(schemas)
}

const createRoutes = async (
  paths: OpenapiPaths,
  context: Context,
): Promise<Route[]> => {
  const routeMap = new Map<string, Route>()
  const pathEntries = Object.entries(paths)

  for (const [path, pathItem] of pathEntries) {
    const namespacePath = getNamespacePath(path, paths)

    const route = await createRoute(namespacePath, path, pathItem, context)

    const existingRoute = routeMap.get(route.path)
    if (existingRoute != null) {
      existingRoute.endpoints.push(...route.endpoints)
      continue
    }

    routeMap.set(route.path, route)
  }

  const routes = Array.from(routeMap.values())

  return routes
    .map(addIsDeprecatedToRoute)
    .map(addIsUndocumentedToRoute)
    .map(addIsDraftToRoute)
}

const getNamespacePath = (path: string, paths: OpenapiPaths): string | null => {
  // Hold namespace in array to allow nested namespaces
  // e.g. namespace for `/foo/bar/baz/get` = `/foo/bar`
  const namespace: string[] = []

  const pathParts = path.split('/').filter((path) => Boolean(path))

  const pathKeys = Object.keys(paths)

  for (const [index, part] of pathParts.entries()) {
    // Namespaces must be consecutive. If there was a path with an endpoint
    // previously, then this part is not in the namespace.
    if (namespace.length !== index) {
      continue
    }

    // An endpoint is a route that ends without further paths. i.e., ends in
    // a letter (not slash).
    const endpoints = pathKeys.filter((key) =>
      new RegExp(`^/${[...namespace, part].join('/')}/\\w+$`).test(key),
    )

    if (endpoints.length === 0) {
      namespace.push(part)
    }
  }

  if (namespace.length === 0) {
    return null
  }

  return `/${namespace.join('/')}`
}

const createRoute = async (
  namespacePath: string | null,
  path: string,
  pathItem: OpenapiPathItem,
  context: Context,
): Promise<Route> => {
  const pathParts = path.split('/')
  const routePath = `/${pathParts.slice(1, -1).join('/')}`
  const name = pathParts.at(-2)
  if (name == null) {
    throw new Error(`Could not resolve name for route at ${path}`)
  }

  const endpoint = await createEndpoint(path, pathItem, context)

  return {
    path: routePath,
    name,
    namespacePath,
    endpoints: endpoint != null ? [endpoint] : [],
    parentPath: getParentPath(routePath),
    isUndocumented: false,
    isDeprecated: false,
    isDraft: false,
  }
}

const addIsDeprecatedToRoute = (route: Route): Route => ({
  ...route,
  isDeprecated: route.endpoints.every((endpoint) => endpoint.isDeprecated),
})

const addIsUndocumentedToRoute = (route: Route): Route => ({
  ...route,
  isUndocumented: route.endpoints.every((endpoint) => endpoint.isUndocumented),
})

const addIsDraftToRoute = (route: Route): Route => ({
  ...route,
  isDraft: route.endpoints.every((endpoint) => endpoint.isDraft),
})

const createNamespaces = (routes: Route[]): Namespace[] => {
  const namespacePaths = [
    ...new Set(
      routes.flatMap((r) => (r.namespacePath == null ? [] : [r.namespacePath])),
    ),
  ]

  return namespacePaths.map((path) => {
    const namespaceRoutes = routes.filter((r) => r.namespacePath === path)

    const pathParts = path.split('/')
    const name = pathParts.at(-1)
    if (name == null) {
      throw new Error(`Could not resolve name for route at ${path}`)
    }

    const isDeprecated = namespaceRoutes.every((r) => r.isDeprecated)
    const isUndocumented = namespaceRoutes.every((r) => r.isUndocumented)
    const isDraft = namespaceRoutes.every((r) => r.isDraft)

    return {
      name,
      path,
      parentPath: getParentPath(path),
      isDeprecated,
      isUndocumented,
      isDraft,
    }
  })
}

const createEndpoint = async (
  path: string,
  pathItem: OpenapiPathItem,
  context: Context,
): Promise<Endpoint | null> => {
  const validMethods: Method[] = ['GET', 'POST', 'PUT', 'DELETE', 'PATCH']
  const validOperations = Object.entries(pathItem).filter(
    ([method, operation]) =>
      validMethods.includes(method.toUpperCase() as Method) &&
      typeof operation === 'object' &&
      operation !== null,
  )
  const supportedMethods = validOperations.map(
    ([method]) => method.toUpperCase() as Method,
  )

  const validOperation = validOperations.find(([m]) => m === 'post')
  if (validOperation == null) {
    throw new Error(`No valid post operation found for ${path}`)
  }

  const [_, operation] = validOperation

  return await createEndpointFromOperation(
    supportedMethods,
    operation as OpenapiOperation,
    path,
    context,
  )
}

const createEndpointFromOperation = async (
  methods: Method[],
  operation: OpenapiOperation,
  path: string,
  context: Context,
): Promise<Endpoint> => {
  const pathParts = path.split('/')
  const endpointPath = `/${pathParts.slice(1).join('/')}`

  const name = pathParts.at(-1)
  if (name == null) {
    throw new Error(`Could not resolve name for endpoint at ${path}`)
  }

  const parsedOperation = OpenapiOperationSchema.parse(operation, {
    path: pathParts,
  })

  const title = parsedOperation['x-title']

  const description = normalizeDescription(parsedOperation.description)

  const isUndocumented = parsedOperation['x-undocumented'].length > 0
  const undocumentedMessage = parsedOperation['x-undocumented']

  const deprecationMessage = parsedOperation['x-deprecated']
  const isDeprecated = deprecationMessage.length > 0

  const isDraft = parsedOperation['x-draft'].length > 0
  const draftMessage = parsedOperation['x-draft']

  const request = createRequest(methods, operation, path)
  const { hasPagination, ...response } = createResponse(
    operation,
    path,
    context,
  )

  const operationAuthMethods = parsedOperation.security.map(
    (securitySchema) => {
      const [authMethod = ''] = Object.keys(securitySchema)
      return authMethod as OpenapiAuthMethod
    },
  )
  const endpointAuthMethods = [
    ...new Set(
      operationAuthMethods
        .map(mapOpenapiToSeamAuthMethod)
        .filter(
          (authMethod): authMethod is SeamAuthMethod => authMethod != null,
        ),
    ),
  ]

  const workspaceScope = getWorkspaceScope(operationAuthMethods)

  const endpoint: Omit<Endpoint, 'codeSamples'> = {
    title,
    name,
    path: endpointPath,
    parentPath: getParentPath(endpointPath),
    description,
    isDeprecated,
    deprecationMessage,
    isUndocumented,
    undocumentedMessage,
    isDraft,
    draftMessage,
    response,
    request,
    hasPagination,
    authMethods: endpointAuthMethods,
    workspaceScope,
  }

  return {
    ...endpoint,
    codeSamples: await Promise.all(
      context.codeSampleDefinitions
        .filter(({ request }) => request.path === endpointPath)
        .map(
          async (codeSampleDefinition) =>
            await createCodeSample(codeSampleDefinition, {
              endpoint,
              formatCode: context.formatCode,
            }),
        ),
    ),
  }
}

export const getWorkspaceScope = (
  authMethods: OpenapiAuthMethod[],
): SeamWorkspaceScope => {
  const hasWorkspaceUnscoped = authMethods.some((method) =>
    method.endsWith('_without_workspace'),
  )

  const workspaceScopedAuthMethods: OpenapiAuthMethod[] = [
    'api_key',
    'client_session',
    'client_session_with_customer',
    'console_session_token_with_workspace',
    'pat_with_workspace',
    'publishable_key',
  ]
  const hasWorkspaceScoped = authMethods.some((method) =>
    workspaceScopedAuthMethods.includes(method),
  )

  const hasNoAuthMethods = !hasWorkspaceUnscoped && !hasWorkspaceScoped
  if (hasNoAuthMethods) return 'none'

  const hasOnlyUnscopedAuth = hasWorkspaceUnscoped && !hasWorkspaceScoped
  if (hasOnlyUnscopedAuth) return 'none'

  const hasBothScopedAndUnscoped = hasWorkspaceUnscoped && hasWorkspaceScoped
  if (hasBothScopedAndUnscoped) return 'optional'

  const hasOnlyScopedAuth = !hasWorkspaceUnscoped && hasWorkspaceScoped
  if (hasOnlyScopedAuth) return 'required'

  return 'none'
}

const createRequest = (
  methods: Method[],
  operation: OpenapiOperation,
  path: string,
): Request => {
  if (methods.length === 0) {
    // eslint-disable-next-line no-console
    console.warn(`At least one HTTP method should be specified for ${path}`)
  }

  if (methods.length > 2) {
    // eslint-disable-next-line no-console
    console.warn(
      `More than two methods detected for ${path}. Was this intended?`,
    )
  }

  if (!methods.includes('POST')) {
    throw new Error(`POST method is missing for ${path}`)
  }

  const semanticMethod = getSemanticMethod(methods)
  const preferredMethod = getPreferredMethod(methods, semanticMethod, operation)

  return {
    methods,
    semanticMethod,
    preferredMethod,
    parameters: createRequestBody(operation, path),
  }
}

const createRequestBody = (
  operation: OpenapiOperation,
  path: string,
): Parameter[] => {
  // This should be done by the createParameters but for some reason it's not
  // TODO: remove this in favour of using createParameters
  if (!('requestBody' in operation) || operation.requestBody === undefined) {
    return []
  }

  const { requestBody } = operation
  const jsonSchema = requestBody.content?.['application/json']?.schema
  if (jsonSchema == null) return []

  const flattenedSchema = flattenOpenapiSchema(jsonSchema)
  if (flattenedSchema.type !== 'object' || flattenedSchema.properties == null) {
    return []
  }

  return createParameters(
    flattenedSchema.properties,
    path,
    flattenedSchema.required,
  )
}

const createParameters = (
  properties: Record<string, OpenapiSchema>,
  path: string,
  requiredParameters: string[] = [],
): Parameter[] =>
  Object.entries(properties)
    .map(([name, property]) => {
      // Don't flatten discriminated arrays as they are handled separately in createParameter
      if (
        property.type === 'array' &&
        'items' in property &&
        'discriminator' in property.items
      ) {
        return [name, property] as [string, OpenapiSchema]
      }

      return [name, flattenOpenapiSchema(property)] as [string, OpenapiSchema]
    })
    .filter(([name, property]) => {
      if (property.type == null) {
        // eslint-disable-next-line no-console
        console.warn(
          `The ${name} property for ${path} will not be documented since it does not define a type.`,
        )
        return false
      }
      return true
    })
    .map(([name, property]) =>
      createParameter(name, property, path, requiredParameters),
    )

const createParameter = (
  name: string,
  property: OpenapiSchema,
  path: string,
  requiredParameters: string[],
): Parameter => {
  const parsedProp = PropertySchema.parse(property, {
    path: [...path.split('/'), name],
  })

  const baseParam: BaseParameter & {
    default?: any
  } = {
    name,
    description: normalizeDescription(String(parsedProp.description ?? '')),
    isRequired: requiredParameters.includes(name),
    isDeprecated: parsedProp['x-deprecated'].length > 0,
    deprecationMessage: parsedProp['x-deprecated'],
    isUndocumented: parsedProp['x-undocumented'].length > 0,
    undocumentedMessage: parsedProp['x-undocumented'],
    isDraft: parsedProp['x-draft'].length > 0,
    draftMessage: parsedProp['x-draft'],
    hasDefault: 'default' in parsedProp,
  }

  if (baseParam.hasDefault) {
    baseParam.default = parsedProp.default
  }

  switch (parsedProp.type) {
    case 'string':
      if (parsedProp.enum !== undefined) {
        return {
          ...baseParam,
          format: 'enum',
          jsonType: 'string',
          values: parsedProp.enum.map((value: string | boolean) => {
            const enumValue = parsedProp['x-enums']?.[String(value)]
            if (parsedProp['x-enums'] != null && enumValue == null) {
              throw new Error(
                `Missing enum value definition in x-enums for "${String(value)}"`,
              )
            }
            return {
              name: String(value),
              description: normalizeDescription(
                String(enumValue?.description ?? ''),
              ),
              isDeprecated: Boolean(enumValue?.deprecated?.length ?? 0),
              deprecationMessage: enumValue?.deprecated ?? '',
              isUndocumented: Boolean(enumValue?.undocumented?.length ?? 0),
              undocumentedMessage: enumValue?.undocumented ?? '',
              isDraft: Boolean(enumValue?.draft?.length ?? 0),
              draftMessage: enumValue?.draft ?? '',
            }
          }),
        }
      }
      if (parsedProp.format === 'date-time') {
        return { ...baseParam, format: 'datetime', jsonType: 'string' }
      }
      if (parsedProp.format === 'uuid') {
        return { ...baseParam, format: 'id', jsonType: 'string' }
      }
      return { ...baseParam, format: 'string', jsonType: 'string' }
    case 'boolean':
      return { ...baseParam, format: 'boolean', jsonType: 'boolean' }
    case 'array': {
      return createArrayParameter(baseParam, property, path)
    }
    case 'object':
      if (property.properties !== undefined) {
        return {
          ...baseParam,
          format: 'object',
          jsonType: 'object',
          parameters: createParameters(property.properties, path),
        }
      }
      return { ...baseParam, format: 'record', jsonType: 'object' }
    case 'number':
    case 'integer':
      return {
        ...baseParam,
        format: 'number',
        jsonType: 'number',
      }
    default:
      throw new Error(`Unsupported property type: ${parsedProp.type}`)
  }
}

const createArrayParameter = (
  baseParam: BaseParameter,
  property: OpenapiSchema,
  path: string,
): Parameter => {
  function createListParameter<T extends BaseListParameter>(
    format: string,
    extraProps: Partial<T> = {},
  ): T {
    return {
      ...baseParam,
      format: 'list' as const,
      jsonType: 'array' as const,
      itemFormat: format,
      ...extraProps,
    } as unknown as T
  }

  const fallbackListParameter =
    createListParameter<RecordListParameter>('record')

  if (property.items == null) {
    return fallbackListParameter
  }

  if ('oneOf' in property.items) {
    if (
      !property.items.oneOf.every(
        (schema: OpenapiSchema) => schema.type === 'object',
      )
    ) {
      return fallbackListParameter
    }

    if (property.items.discriminator?.propertyName == null) {
      throw new Error(
        `Missing discriminator property name for ${baseParam.name} in ${path}`,
      )
    }

    return createListParameter<DiscriminatedListParameter>(
      'discriminated_object',
      {
        discriminator: property.items.discriminator.propertyName,
        variants: property.items.oneOf.map((schema: OpenapiSchema) => ({
          parameters: createParameters(
            schema.properties ?? {},
            path,
            schema.required ?? [],
          ),
          description: normalizeDescription(schema.description ?? ''),
        })),
      },
    )
  }

  const itemParameter = createParameter('item', property.items, path, [])

  switch (itemParameter.format) {
    case 'string':
      return createListParameter<StringListParameter>('string')

    case 'number':
      return createListParameter<NumberListParameter>('number')

    case 'boolean':
      return createListParameter<BooleanListParameter>('boolean')

    case 'datetime':
      return createListParameter<DatetimeListParameter>('datetime')

    case 'id':
      return createListParameter<IdListParameter>('id')

    case 'enum':
      return createListParameter<EnumListParameter>('enum', {
        itemEnumValues: itemParameter.values,
      })

    case 'object':
      return createListParameter<ObjectListParameter>('object', {
        itemParameters: itemParameter.parameters,
      })

    case 'record':
      return createListParameter<RecordListParameter>('record')

    default:
      return fallbackListParameter
  }
}

const createPagination = (
  schema: Openapi['components']['schemas'][number] | undefined,
  schemas: Openapi['components']['schemas'],
): Pagination | null => {
  if (schema == null) return null
  return {
    responseKey: paginationResponseKey,
    description: normalizeDescription(schema.description ?? ''),
    properties: createProperties(
      schema.properties ?? {},
      [paginationResponseKey],
      [],
      schemas,
    ),
  }
}

export const createResources = async (
  schemas: Openapi['components']['schemas'],
  routes: Route[],
  context: Context,
): Promise<Resource[]> => {
  const resources: Resource[] = []
  for (const [schemaName, schema] of Object.entries(schemas)) {
    const { success: isValidEventSchema, data: parsedEvent } =
      EventResourceSchema.safeParse(schema)

    if (isValidEventSchema) {
      const commonProperties = findCommonOpenapiSchemaProperties(
        parsedEvent.oneOf,
      )
      const eventSchema: OpenapiSchema = {
        'x-route-path': parsedEvent['x-route-path'],
        properties: commonProperties,
        type: 'object',
      }
      const resource = await createResource(
        schemaName,
        eventSchema,
        schemas,
        routes,
        context,
      )
      resources.push(resource)
      continue
    }

    const { success: isValidResourceSchema } = ResourceSchema.safeParse(schema)
    if (isValidResourceSchema) {
      const resource = await createResource(
        schemaName,
        schema,
        schemas,
        routes,
        context,
      )
      resources.push(resource)
      continue
    }
  }

  return resources
}

const createResource = async (
  schemaName: string,
  schema: OpenapiSchema,
  schemas: Openapi['components']['schemas'],
  routes: Route[],
  context: Context,
): Promise<Resource> => {
  const routePath = validateRoutePath(
    schemaName,
    schema['x-route-path'],
    routes,
  )

  const propertyGroups = getPropertyGroups(schema)
  const resourceType = schemaName

  const resource: Omit<Resource, 'resourceSamples'> = {
    resourceType,
    properties: createProperties(
      schema.properties ?? {},
      [schemaName],
      propertyGroups,
      schemas,
    ),
    description: normalizeDescription(schema.description ?? ''),
    isDeprecated: schema.deprecated ?? false,
    routePath,
    deprecationMessage: schema['x-deprecated'] ?? '',
    isUndocumented: (schema['x-undocumented'] ?? '').length > 0,
    undocumentedMessage: schema['x-undocumented'] ?? '',
    isDraft: (schema['x-draft'] ?? '').length > 0,
    draftMessage: schema['x-draft'] ?? '',
    propertyGroups,
  }

  return {
    ...resource,
    resourceSamples: await Promise.all(
      context.resourceSampleDefinitions
        .filter(
          (resourceSample) => resourceSample.resource_type === resourceType,
        )
        .map(
          async (resourceSampleDefinition) =>
            await createResourceSample(resourceSampleDefinition, {
              resource,
              schemas: context.schemas,
              formatCode: context.formatCode,
            }),
        ),
    ),
  }
}

const validateRoutePath = (
  resourceName: string,
  routePath: string | undefined,
  routes: Route[],
): string => {
  if (routePath == null || routePath.length === 0) {
    throw new Error(`Resource ${resourceName} is missing a route path`)
  }
  if (!routes.some((r) => r.path === routePath)) {
    throw new Error(`Route path ${routePath} not found in routes`)
  }

  return routePath
}

const getPropertyGroups = (schema: OpenapiSchema): PropertyGroup[] => {
  const rawPropertyGroups = schema['x-property-groups'] ?? {}

  const propertyGroups: Record<string, PropertyGroup> = {}

  for (const [key, group] of Object.entries(rawPropertyGroups)) {
    propertyGroups[key] = {
      name: group.name,
      propertyGroupKey: key,
    }
  }

  return Object.values(propertyGroups)
}

const getVariantGroups = (schema: OpenapiSchema): VariantGroup[] => {
  const rawVariantGroups = schema['x-variant-groups'] ?? {}

  const variantGroups: Record<string, VariantGroup> = {}

  for (const [key, group] of Object.entries(rawVariantGroups)) {
    variantGroups[key] = {
      name: group.name,
      variantGroupKey: key,
    }
  }

  return Object.values(variantGroups)
}

const createResponse = (
  operation: OpenapiOperation,
  path: string,
  context: Context,
): Response & { hasPagination: boolean } => {
  if (!('responses' in operation) || operation.responses == null) {
    throw new Error(
      `Missing responses in operation for ${operation.operationId}`,
    )
  }

  const parsedOperation = OpenapiOperationSchema.parse(operation, {
    path: [...path.split('/')],
  })
  const { responses } = operation

  const okResponse = responses['200']

  if (typeof okResponse !== 'object' || okResponse == null) {
    return {
      responseType: 'void',
      description: normalizeDescription('Unknown'),
      hasPagination: false,
    }
  }

  const description = normalizeDescription(okResponse.description ?? '')

  if (!('x-response-key' in parsedOperation)) {
    throw new Error(`Missing responseKey for ${path}`)
  }

  const responseKey = parsedOperation['x-response-key']

  if (responseKey === null) {
    return {
      responseType: 'void',
      description,
      hasPagination: false,
    }
  }

  if (responseKey == null) {
    throw new Error(`Missing responseKey for ${path}`)
  }

  const content = 'content' in okResponse ? okResponse.content : null
  if (typeof content !== 'object' || content === null) {
    return {
      responseType: 'void',
      description,
      hasPagination: false,
    }
  }

  const jsonContent =
    'application/json' in content ? content['application/json'] : null
  if (jsonContent === null) {
    return {
      responseType: 'void',
      description,
      hasPagination: false,
    }
  }

  const schema = 'schema' in jsonContent ? jsonContent.schema : null
  if (schema === null) {
    return {
      responseType: 'void',
      description,
      hasPagination: false,
    }
  }

  if (
    'type' in schema &&
    'properties' in schema &&
    schema.type === 'object' &&
    typeof schema.properties === 'object' &&
    schema.properties !== null
  ) {
    const { properties } = schema

    if (!(responseKey in properties)) {
      throw new Error(
        `Response key '${responseKey}' not found in response schema for ${path}`,
      )
    }

    const refKey = responseKey
    if (refKey != null && properties[refKey] != null) {
      const props = schema.properties[refKey]
      const refString = props?.$ref ?? props?.items?.$ref
      const resourceType = refString?.split('/').at(-1) ?? 'unknown'

      const actionAttemptType = validateActionAttemptType(
        parsedOperation['x-action-attempt-type'] ?? null,
        responseKey,
        path,
        resourceType,
        context.validActionAttemptTypes,
      )

      const batchKeys = parsedOperation['x-batch-keys']
      const batchResourceTypes = batchKeys
        ? batchKeys.flatMap((key) => {
            const resourceRef = props?.properties?.[key]?.items?.$ref
            if (resourceRef == null) {
              return []
            }

            // get last part of $ref. e.g. { '$ref': '#/components/schemas/space' }
            const batchResourceType = resourceRef.split('/').at(-1)
            if (batchResourceType == null) {
              return []
            }

            if (!context.validResourceTypes.includes(batchResourceType)) {
              throw new Error(
                `Unknown batch resource type '${batchResourceType}' referenced by ${path}`,
              )
            }

            return [
              {
                batchKey: key,
                resourceType: batchResourceType,
              },
            ]
          })
        : null

      return {
        responseType: props?.type === 'array' ? 'resource_list' : 'resource',
        responseKey: refKey,
        resourceType,
        description,
        hasPagination:
          (paginationResponseKey in properties &&
            properties[paginationResponseKey]?.$ref?.endsWith(
              `/${paginationResponseKey}`,
            )) ??
          false,
        actionAttemptType,
        batchResourceTypes: batchResourceTypes ?? null,
      }
    }
  }

  return {
    responseType: 'void',
    description: normalizeDescription('Unknown'),
    hasPagination: false,
  }
}

const validateActionAttemptType = (
  actionAttemptType: string | null,
  responseKey: string,
  path: string,
  resourceType: string,
  validActionAttemptTypes: string[],
): string | null => {
  const excludedPaths = ['/action_attempts']
  const isPathExcluded = excludedPaths.some((p) => path.startsWith(p))

  if (resourceType !== 'action_attempt') {
    return null
  }

  if (
    actionAttemptType == null &&
    responseKey === 'action_attempt' &&
    !isPathExcluded
  ) {
    throw new Error(`Missing action_attempt_type for path ${path}`)
  }

  if (
    actionAttemptType != null &&
    !validActionAttemptTypes.includes(actionAttemptType)
  ) {
    throw new Error(
      `Invalid action_attempt_type '${actionAttemptType}' for path ${path}`,
    )
  }

  return actionAttemptType
}

export const createProperties = (
  properties: Record<string, OpenapiSchema>,
  parentPaths: string[],
  propertyGroups: PropertyGroup[],
  schemas: Openapi['components']['schemas'],
): Property[] =>
  Object.entries(properties)
    .map(([name, property]) => {
      // Don't flatten discriminated arrays as they are handled separately in createProperty
      if (
        property.type === 'array' &&
        'items' in property &&
        'discriminator' in property.items
      ) {
        return [name, property] as [string, OpenapiSchema]
      }

      return [name, flattenOpenapiSchema(property)] as [string, OpenapiSchema]
    })
    .filter(([name, property]) => {
      if (property.type == null) {
        // eslint-disable-next-line no-console
        console.warn(
          `The ${name} property for ${parentPaths.join('.')} will not be documented since it does not define a type.`,
        )
        return false
      }

      return true
    })
    .map(([name, prop]) =>
      createProperty(name, prop, parentPaths, propertyGroups, schemas),
    )

const createProperty = (
  name: string,
  prop: OpenapiSchema,
  parentPaths: string[],
  propertyGroups: PropertyGroup[],
  schemas: Openapi['components']['schemas'],
): Property => {
  const parsedProp = parsePropertySchema(name, prop, parentPaths, schemas)

  if (name.startsWith('ext_')) {
    throw new Error(
      `Property cannot start with ext_ : ${parentPaths.join('.')}.${name}`,
    )
  }

  const propertyGroupKey = parsedProp['x-property-group-key'] as string
  validateGroupKey(propertyGroupKey, name, parentPaths, propertyGroups)

  const baseProperty = {
    name,
    description: normalizeDescription(String(parsedProp.description ?? '')),
    isDeprecated: parsedProp['x-deprecated'].length > 0,
    deprecationMessage: parsedProp['x-deprecated'],
    isUndocumented: parsedProp['x-undocumented'].length > 0,
    undocumentedMessage: parsedProp['x-undocumented'],
    isDraft: parsedProp['x-draft'].length > 0,
    draftMessage: parsedProp['x-draft'],
    propertyGroupKey: propertyGroupKey === '' ? null : propertyGroupKey,
  }

  if (
    parentPaths.includes('batch') &&
    prop.type === 'array' &&
    prop.items?.$ref
  ) {
    const refPath = prop.items.$ref
    const resourceType = refPath.split('/').pop()

    if (resourceType) {
      const batchResourceProperty: BatchResourceProperty = {
        ...baseProperty,
        format: 'record',
        jsonType: 'object',
        resourceType,
      }

      return batchResourceProperty
    }
  }

  switch (parsedProp.type) {
    case 'string':
      if (parsedProp.enum !== undefined) {
        return {
          ...baseProperty,
          format: 'enum',
          jsonType: 'string',
          values: parsedProp.enum.map((value: string | boolean) => {
            const enumValue = parsedProp['x-enums']?.[String(value)]
            if (parsedProp['x-enums'] != null && enumValue == null) {
              throw new Error(
                `Missing enum value definition in x-enums for "${String(value)}"`,
              )
            }
            return {
              name: String(value),
              description: normalizeDescription(
                String(enumValue?.description ?? ''),
              ),
              isDeprecated: Boolean(enumValue?.deprecated?.length ?? 0),
              deprecationMessage: enumValue?.deprecated ?? '',
              isUndocumented: Boolean(enumValue?.undocumented?.length ?? 0),
              undocumentedMessage: enumValue?.undocumented ?? '',
              isDraft: Boolean(enumValue?.draft?.length ?? 0),
              draftMessage: enumValue?.draft ?? '',
            }
          }),
        }
      }
      if (parsedProp.format === 'date-time') {
        return { ...baseProperty, format: 'datetime', jsonType: 'string' }
      }
      if (parsedProp.format === 'uuid') {
        return { ...baseProperty, format: 'id', jsonType: 'string' }
      }
      return { ...baseProperty, format: 'string', jsonType: 'string' }
    case 'boolean':
      return { ...baseProperty, format: 'boolean', jsonType: 'boolean' }
    case 'array': {
      return createArrayProperty(baseProperty, prop, parentPaths, schemas)
    }
    case 'object':
      if (prop.properties !== undefined) {
        const nestedPropertyGroups = getPropertyGroups(prop)
        return {
          ...baseProperty,
          format: 'object',
          jsonType: 'object',
          propertyGroups: nestedPropertyGroups,
          properties: createProperties(
            prop.properties,
            [...parentPaths, name],
            nestedPropertyGroups,
            schemas,
          ),
        }
      }
      return { ...baseProperty, format: 'record', jsonType: 'object' }
    case 'number':
    case 'integer':
      return {
        ...baseProperty,
        format: 'number',
        jsonType: 'number',
      }
    default:
      throw new Error(`Unsupported property type: ${parsedProp.type}`)
  }
}

const validateGroupKey = (
  groupKey: string | null,
  propertyName: string,
  parentPaths: string[],
  groups: PropertyGroup[] | VariantGroup[],
): void => {
  if (groupKey == null || groupKey.length === 0) return

  const resourceName = parentPaths.at(0)
  if (resourceName == null) {
    throw new Error(
      `Missing resource name for property "${propertyName}" in ${parentPaths.join('.')}`,
    )
  }

  const validGroupKeys = groups.map((g) => {
    if ('propertyGroupKey' in g) return g.propertyGroupKey
    if ('variantGroupKey' in g) return g.variantGroupKey
    throw new Error('Expected propertyGroupKey or variantGroupKey')
  })
  if (validGroupKeys.length === 0) {
    throw new Error(
      `The "${propertyName}" has group ${groupKey} but ${parentPaths.join('.')} does not define any groups.`,
    )
  }

  if (!validGroupKeys.includes(groupKey)) {
    throw new Error(
      `Invalid property group "${groupKey}" for property "${propertyName}" in resource "${resourceName}". Valid groups are: ${validGroupKeys.join(', ')}`,
    )
  }
}

const createArrayProperty = (
  baseProperty: BaseProperty,
  prop: OpenapiSchema,
  parentPaths: string[],
  schemas: Openapi['components']['schemas'],
): Property => {
  function createListProperty<T extends ListProperty>(
    format: string,
    extraProps: Partial<T> = {},
  ): T {
    return {
      ...baseProperty,
      format: 'list' as const,
      jsonType: 'array' as const,
      itemFormat: format,
      ...extraProps,
    } as unknown as T
  }

  const fallbackListProperty = createListProperty<RecordListProperty>('record')

  if (prop.items == null) {
    return fallbackListProperty
  }

  if ('oneOf' in prop.items) {
    if (!prop.items.oneOf.every((schema) => schema.type === 'object')) {
      return fallbackListProperty
    }

    if (prop.items.discriminator?.propertyName == null) {
      throw new Error(
        `Missing discriminator property name for ${baseProperty.name} in ${parentPaths.join('.')}`,
      )
    }

    const variantGroups = getVariantGroups(prop)

    return createListProperty<DiscriminatedListProperty>(
      'discriminated_object',
      {
        discriminator: prop.items.discriminator.propertyName,
        variantGroups,
        variants: prop.items.oneOf.map((schema) => {
          const errorCode = schema.properties?.['error_code']?.enum?.[0]

          if (
            errorCode != null &&
            !(
              'x-resource-type' in schema &&
              schema['x-resource-type'] != null &&
              schema['x-resource-type'].length > 0
            )
          ) {
            throw new Error(`Missing resource_type for error code ${errorCode}`)
          }

          const resourceType = schema['x-resource-type'] ?? null
          const variantGroupKey = schema['x-variant-group-key'] ?? null
          validateGroupKey(
            variantGroupKey,
            baseProperty.name,
            parentPaths,
            variantGroups,
          )
          return {
            resourceType,
            variantGroupKey,
            properties: createProperties(
              schema.properties ?? {},
              [...parentPaths, baseProperty.name],
              [],
              schemas,
            ),
            description: normalizeDescription(schema.description ?? ''),
          }
        }),
      },
    )
  }

  const itemProperty = createProperty(
    'item',
    prop.items,
    [...parentPaths, baseProperty.name],
    [],
    schemas,
  )

  switch (itemProperty.format) {
    case 'string':
      return createListProperty<StringListProperty>('string')

    case 'number':
      return createListProperty<NumberListProperty>('number')

    case 'boolean':
      return createListProperty<BooleanListProperty>('boolean')

    case 'datetime':
      return createListProperty<DatetimeListProperty>('datetime')

    case 'id':
      return createListProperty<IdListProperty>('id')

    case 'enum':
      return createListProperty<EnumListProperty>('enum', {
        itemEnumValues: itemProperty.values,
      })

    case 'object':
      if (!('properties' in itemProperty)) {
        throw new Error(
          `Missing properties for object in ${parentPaths.join('.')}`,
        )
      }

      return createListProperty<ObjectListProperty>('object', {
        itemProperties: itemProperty.properties,
      })

    case 'record':
      return createListProperty<RecordListProperty>('record')

    default:
      return fallbackListProperty
  }
}

const parsePropertySchema = (
  name: string,
  prop: OpenapiSchema,
  parentPaths: string[],
  schemas: Openapi['components']['schemas'],
): z.infer<typeof PropertySchema> => {
  if (parentPaths.includes('batch')) {
    return parseBatchPropertySchema(name, prop, parentPaths, schemas)
  }

  return PropertySchema.parse(prop, {
    path: [...parentPaths, name],
  })
}

/**
 * Parses the correct schema for a batch property. Batch properties have the following path:
 * `batch.some_resources` where the correct schema should be for `some_resource`. Try to
 * extract the schema name from the $ref path and parse it from global openapi schemas.
 */
const parseBatchPropertySchema = (
  name: string,
  prop: OpenapiSchema,
  parentPaths: string[],
  schemas: Openapi['components']['schemas'],
): z.infer<typeof PropertySchema> => {
  const refPath = prop.items?.$ref
  // Extract schema name from ref like '#/components/schemas/access_code' -> 'access_code'
  const schemaName = refPath?.split('/').pop()

  if (schemaName == null || schemas[schemaName] == null) {
    throw new Error(
      `Missing $ref schema "${schemaName}" for property "batch.${name}"`,
    )
  }

  const referencedSchema = schemas[schemaName]

  return PropertySchema.parse(referencedSchema, {
    path: [...parentPaths, name],
  })
}

export const getSemanticMethod = (methods: Method[]): Method => {
  if (methods.length === 1) {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    return methods[0]!
  }

  const priorityOrder: Method[] = ['PUT', 'PATCH', 'GET', 'DELETE', 'POST']

  for (const method of priorityOrder) {
    if (methods.includes(method)) {
      return method
    }
  }

  return 'POST'
}

export const getPreferredMethod = (
  methods: Method[],
  semanticMethod: Method,
  operation: OpenapiOperation,
): Method => {
  if (methods.length === 1) {
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    return methods[0]!
  }

  if (methods.includes('POST')) {
    if (semanticMethod === 'GET' || semanticMethod === 'DELETE') {
      const hasComplexParameters =
        (operation.parameters?.some(
          (param) =>
            param.schema?.type === 'array' || param.schema?.type === 'object',
        ) ??
          false) ||
        operation.requestBody?.content?.['application/json']?.schema?.type ===
          'object'

      if (hasComplexParameters) {
        return 'POST'
      }
    }
  }

  return semanticMethod
}

const createEvents = async (
  schemas: Openapi['components']['schemas'],
  routes: Route[],
  context: Context,
): Promise<EventResource[]> => {
  const eventSchema = schemas['event']
  if (
    eventSchema == null ||
    typeof eventSchema !== 'object' ||
    !('oneOf' in eventSchema) ||
    !Array.isArray(eventSchema.oneOf)
  ) {
    return []
  }

  const events = await Promise.all(
    eventSchema.oneOf.map(async (schema) => {
      if (
        typeof schema !== 'object' ||
        schema.properties?.['event_type']?.enum?.[0] == null
      ) {
        return null
      }

      const eventType = schema.properties['event_type'].enum[0]

      if (!('x-route-path' in schema && schema['x-route-path'].length > 0)) {
        throw new Error(`Missing route_path for event type ${eventType}`)
      }

      const resource = await createResource(
        'event',
        schema,
        schemas,
        routes,
        context,
      )
      return {
        ...resource,
        eventType,
        resourceSamples: resource.resourceSamples.filter(
          (resourceSample) =>
            resourceSample.properties['event_type'] === eventType,
        ),
      }
    }),
  )

  return events.filter((event): event is EventResource => event !== null)
}

const createActionAttempts = async (
  schemas: Openapi['components']['schemas'],
  routes: Route[],
  context: Context,
): Promise<ActionAttempt[]> => {
  const actionAttemptSchema = schemas['action_attempt']
  if (
    actionAttemptSchema == null ||
    typeof actionAttemptSchema !== 'object' ||
    !('oneOf' in actionAttemptSchema) ||
    !Array.isArray(actionAttemptSchema.oneOf)
  ) {
    return []
  }

  const schemasByActionType = new Map<string, OpenapiSchema[]>()

  for (const schema of actionAttemptSchema.oneOf) {
    if (
      typeof schema !== 'object' ||
      schema.properties?.['action_type']?.enum?.[0] == null
    ) {
      continue
    }

    const actionType = schema.properties['action_type'].enum[0]
    const currentSchemas = schemasByActionType.get(actionType)

    if (currentSchemas == null) {
      schemasByActionType.set(actionType, [schema])
    } else {
      currentSchemas.push(schema)
    }
  }

  return await Promise.all(
    Array.from(schemasByActionType.entries()).map(
      async ([actionType, actionAttemptSchemas]) => {
        const mergedProperties: Record<string, OpenapiSchema> = {}

        const allPropertyKeys = new Set<string>()
        for (const schema of actionAttemptSchemas) {
          if (schema.properties != null) {
            Object.keys(schema.properties).forEach((key) => {
              allPropertyKeys.add(key)
            })
          }
        }

        for (const propKey of allPropertyKeys) {
          const propDefinitions = actionAttemptSchemas
            .filter((schema) => schema.properties?.[propKey] != null)
            .map((schema) => schema.properties?.[propKey])

          if (propDefinitions.length === 0) continue

          const nonNullableDefinition = propDefinitions.find((prop) => {
            if (prop == null) return false

            return !('nullable' in prop && prop.nullable === true)
          })

          mergedProperties[propKey] =
            nonNullableDefinition ?? propDefinitions[0] ?? {}
        }

        // Ensure standard status field
        mergedProperties['status'] = {
          ...mergedProperties['status'],
          type: 'string',
          enum: ['success', 'pending', 'error'],
        }

        const schemaWithMergedProperties: OpenapiSchema = {
          ...(actionAttemptSchema['x-route-path'] != null && {
            'x-route-path': actionAttemptSchema['x-route-path'],
          }),
          ...actionAttemptSchemas[0],
          properties: mergedProperties,
        }

        const resource = await createResource(
          'action_attempt',
          schemaWithMergedProperties,
          schemas,
          routes,
          context,
        )

        return {
          ...resource,
          resourceType: 'action_attempt',
          actionAttemptType: actionType,
          resourceSamples: resource.resourceSamples.filter(
            (resourceSample) =>
              resourceSample.properties['action_type'] === actionType,
          ),
        }
      },
    ),
  )
}

const getParentPath = (path: string): string | null =>
  path.split('/').length === 2 ? null : path.split('/').slice(0, -1).join('/')

const normalizeDescription = (content: string): string =>
  content
    .split('\n\n')
    .map((s) => s.trim())
    .join('\n\n')