import {
  AuthorizationRequestState,
  AuthorizationResponsePayload,
  AuthorizationResponseState,
  AuthorizationResponseStateStatus,
  AuthorizationResponseStateWithVerifiedData,
  decodeUriAsJson,
  VerifiedAuthorizationResponse,
} from '@sphereon/did-auth-siop'
import { getAgentResolver } from '@sphereon/ssi-sdk-ext.did-utils'
import { shaHasher as defaultHasher } from '@sphereon/ssi-sdk.core'
import { validate as isValidUUID } from 'uuid'
import type { ImportDcqlQueryItem } from '@sphereon/ssi-sdk.pd-manager'
import {
  AdditionalClaims,
  CredentialMapper,
  HasherSync,
  ICredentialSubject,
  IPresentation,
  IVerifiableCredential,
  IVerifiablePresentation,
  JwtDecodedVerifiablePresentation,
  MdocDeviceResponse,
  MdocOid4vpMdocVpToken,
  OriginalVerifiablePresentation,
  SdJwtDecodedVerifiableCredential,
} from '@sphereon/ssi-types'
import { IAgentPlugin } from '@veramo/core'
import { DcqlQuery } from 'dcql'
import {
  IAuthorizationRequestPayloads,
  ICreateAuthRequestArgs,
  IGetAuthRequestStateArgs,
  IGetAuthResponseStateArgs,
  IGetRedirectUriArgs,
  ImportDefinitionsArgs,
  IPEXInstanceOptions,
  IRequiredContext,
  IRPDefaultOpts,
  IRPOptions,
  ISiopRPInstanceArgs,
  ISiopv2RPOpts,
  IUpdateRequestStateArgs,
  IVerifyAuthResponseStateArgs,
  schema,
} from '../index'
import { RPInstance } from '../RPInstance'
import { ISIOPv2RP } from '../types/ISIOPv2RP'

export class SIOPv2RP implements IAgentPlugin {
  private readonly opts: ISiopv2RPOpts
  private static readonly _DEFAULT_OPTS_KEY = '_default'
  private readonly instances: Map<string, RPInstance> = new Map()
  readonly schema = schema.IDidAuthSiopOpAuthenticator

  readonly methods: ISIOPv2RP = {
    siopCreateAuthRequestURI: this.createAuthorizationRequestURI.bind(this),
    siopCreateAuthRequestPayloads: this.createAuthorizationRequestPayloads.bind(this),
    siopGetAuthRequestState: this.siopGetRequestState.bind(this),
    siopGetAuthResponseState: this.siopGetResponseState.bind(this),
    siopUpdateAuthRequestState: this.siopUpdateRequestState.bind(this),
    siopDeleteAuthState: this.siopDeleteState.bind(this),
    siopVerifyAuthResponse: this.siopVerifyAuthResponse.bind(this),
    siopImportDefinitions: this.siopImportDefinitions.bind(this),
    siopGetRedirectURI: this.siopGetRedirectURI.bind(this),
  }

  constructor(opts: ISiopv2RPOpts) {
    this.opts = opts
  }

  public setDefaultOpts(rpDefaultOpts: IRPDefaultOpts, context: IRequiredContext) {
    // We allow setting default options later, because in some cases you might want to query the agent for defaults. This cannot happen when the agent is being build (this is when the constructor is being called)
    this.opts.defaultOpts = rpDefaultOpts
    // We however do require the agent to be responsible for resolution, otherwise people might encounter strange errors, that are very hard to track down
    if (
      !this.opts.defaultOpts.identifierOpts.resolveOpts?.resolver ||
      typeof this.opts.defaultOpts.identifierOpts.resolveOpts.resolver.resolve !== 'function'
    ) {
      this.opts.defaultOpts.identifierOpts.resolveOpts = {
        ...this.opts.defaultOpts.identifierOpts.resolveOpts,
        resolver: getAgentResolver(context, { uniresolverResolution: true, resolverResolution: true, localResolution: true }),
      }
    }
  }

  private async createAuthorizationRequestURI(createArgs: ICreateAuthRequestArgs, context: IRequiredContext): Promise<string> {
    return await this.getRPInstance(
      {
        createWhenNotPresent: true,
        responseRedirectURI: createArgs.responseRedirectURI,
        ...(createArgs.useQueryIdInstance === true && { queryId: createArgs.queryId }),
      },
      context,
    )
      .then((rp) => rp.createAuthorizationRequestURI(createArgs, context))
      .then((URI) => URI.encodedUri)
  }

  private async createAuthorizationRequestPayloads(
    createArgs: ICreateAuthRequestArgs,
    context: IRequiredContext,
  ): Promise<IAuthorizationRequestPayloads> {
    return await this.getRPInstance({ createWhenNotPresent: true, queryId: createArgs.queryId }, context)
      .then((rp) => rp.createAuthorizationRequest(createArgs, context))
      .then(async (request) => {
        const authRequest: IAuthorizationRequestPayloads = {
          authorizationRequest: request.payload,
          requestObject: await request.requestObjectJwt(),
          requestObjectDecoded: request.requestObject?.getPayload(),
        }
        return authRequest
      })
  }

  private async siopGetRequestState(args: IGetAuthRequestStateArgs, context: IRequiredContext): Promise<AuthorizationRequestState | undefined> {
    return await this.getRPInstance({ createWhenNotPresent: false, queryId: args.queryId }, context).then((rp) =>
      rp.get(context).then((rp) => rp.sessionManager.getRequestStateByCorrelationId(args.correlationId, args.errorOnNotFound)),
    )
  }

  private async siopGetResponseState(
    args: IGetAuthResponseStateArgs,
    context: IRequiredContext,
  ): Promise<AuthorizationResponseStateWithVerifiedData | undefined> {
    const rpInstance: RPInstance = await this.getRPInstance({ createWhenNotPresent: false, queryId: args.queryId }, context)
    const authorizationResponseState: AuthorizationResponseState | undefined = await rpInstance
      .get(context)
      .then((rp) => rp.sessionManager.getResponseStateByCorrelationId(args.correlationId, args.errorOnNotFound))
    if (authorizationResponseState === undefined) {
      return undefined
    }

    const responseState = authorizationResponseState as AuthorizationResponseStateWithVerifiedData
    if (responseState.status === AuthorizationResponseStateStatus.VERIFIED) {
      let hasher: HasherSync | undefined
      if (
        CredentialMapper.isSdJwtEncoded(responseState.response.payload.vp_token as OriginalVerifiablePresentation) &&
        (!rpInstance.rpOptions.credentialOpts?.hasher || typeof rpInstance.rpOptions.credentialOpts?.hasher !== 'function')
      ) {
        hasher = defaultHasher
      }

      // FIXME SSISDK-64 currently assuming that all vp tokens are of type EncodedDcqlPresentationVpToken as we only work with DCQL now. But the types still indicate it can be another type of vp token
      const rawVpToken = responseState.response.payload.vp_token
      const vpToken = rawVpToken && (typeof rawVpToken === 'string' ? JSON.parse(rawVpToken) : rawVpToken)
      const claims = []
      for (const [credentialQueryId, presentationValue] of Object.entries(vpToken)) {
        let singleVP: OriginalVerifiablePresentation
        if (Array.isArray(presentationValue)) {
          if (presentationValue.length === 0) {
            throw Error(`DCQL query '${credentialQueryId}' has empty array of presentations`)
          }
          if (presentationValue.length > 1) {
            throw Error(`DCQL query '${credentialQueryId}' has multiple presentations (${presentationValue.length}), but only one is supported atm`)
          }
          singleVP = presentationValue[0] as OriginalVerifiablePresentation
        } else {
          singleVP = presentationValue as OriginalVerifiablePresentation
        }

        // todo this should also include mdl-mdoc
        const presentationDecoded = CredentialMapper.decodeVerifiablePresentation(
          singleVP as OriginalVerifiablePresentation,
          //todo: later we want to conditionally pass in options for mdl-mdoc here
          hasher,
        )
        console.log(`presentationDecoded: ${JSON.stringify(presentationDecoded)}`)

        const allClaims: AdditionalClaims = {}
        const presentationOrClaims = this.presentationOrClaimsFrom(presentationDecoded)
        if ('verifiableCredential' in presentationOrClaims) {
          for (const credential of presentationOrClaims.verifiableCredential) {
            const vc = credential as IVerifiableCredential
            const schemaValidationResult = await context.agent.cvVerifySchema({
              credential,
              hasher,
              validationPolicy: rpInstance.rpOptions.verificationPolicies?.schemaValidation,
            })
            if (!schemaValidationResult.result) {
              responseState.status = AuthorizationResponseStateStatus.ERROR
              responseState.error = new Error(schemaValidationResult.error)
              return responseState
            }

            const credentialSubject = vc.credentialSubject as ICredentialSubject & AdditionalClaims
            if (!('id' in allClaims)) {
              allClaims['id'] = credentialSubject.id
            }

            Object.entries(credentialSubject).forEach(([key, value]) => {
              if (!(key in allClaims)) {
                allClaims[key] = value
              }
            })

            claims.push({
              id: credentialQueryId,
              type: vc.type[0],
              claims: allClaims,
            })
          }
        } else {
          claims.push({
            id: credentialQueryId,
            type: (presentationDecoded as SdJwtDecodedVerifiableCredential).decodedPayload.vct,
            claims: presentationOrClaims,
          })
        }
      }

      responseState.verifiedData = {
        ...(responseState.response.payload.vp_token && {
          authorization_response: {
            vp_token:
              typeof responseState.response.payload.vp_token === 'string'
                ? JSON.parse(responseState.response.payload.vp_token)
                : responseState.response.payload.vp_token,
          },
        }),
        ...(claims.length > 0 && { credential_claims: claims }),
      }
    }

    return responseState
  }

  private presentationOrClaimsFrom = (
    presentationDecoded:
      | JwtDecodedVerifiablePresentation
      | IVerifiablePresentation
      | SdJwtDecodedVerifiableCredential
      | MdocOid4vpMdocVpToken
      | MdocDeviceResponse,
  ): AdditionalClaims | IPresentation => {
    return CredentialMapper.isSdJwtDecodedCredential(presentationDecoded)
      ? presentationDecoded.decodedPayload
      : CredentialMapper.toUniformPresentation(presentationDecoded as OriginalVerifiablePresentation)
  }

  private async siopUpdateRequestState(args: IUpdateRequestStateArgs, context: IRequiredContext): Promise<AuthorizationRequestState> {
    if (args.state !== 'authorization_request_created') {
      throw Error(`Only 'authorization_request_created' status is supported for this method at this point`)
    }
    return await this.getRPInstance({ createWhenNotPresent: false, queryId: args.queryId }, context)
      // todo: In the SIOP library we need to update the signal method to be more like this method
      .then((rp) =>
        rp.get(context).then(async (rp) => {
          await rp.signalAuthRequestRetrieved({
            correlationId: args.correlationId,
            error: args.error ? new Error(args.error) : undefined,
          })
          return (await rp.sessionManager.getRequestStateByCorrelationId(args.correlationId, true)) as AuthorizationRequestState
        }),
      )
  }

  private async siopDeleteState(args: IGetAuthResponseStateArgs, context: IRequiredContext): Promise<boolean> {
    return await this.getRPInstance({ createWhenNotPresent: false, queryId: args.queryId }, context)
      .then((rp) => rp.get(context).then((rp) => rp.sessionManager.deleteStateForCorrelationId(args.correlationId)))
      .then(() => true)
  }

  private async siopVerifyAuthResponse(args: IVerifyAuthResponseStateArgs, context: IRequiredContext): Promise<VerifiedAuthorizationResponse> {
    if (!args.authorizationResponse) {
      throw Error('No SIOPv2 Authorization Response received')
    }
    const authResponse =
      typeof args.authorizationResponse === 'string'
        ? (decodeUriAsJson(args.authorizationResponse) as AuthorizationResponsePayload)
        : args.authorizationResponse
    return await this.getRPInstance({ createWhenNotPresent: false, queryId: args.queryId }, context).then((rp) =>
      rp.get(context).then((rp) =>
        rp.verifyAuthorizationResponse(authResponse, {
          correlationId: args.correlationId,
          ...(args.dcqlQuery && { dcqlQuery: args.dcqlQuery }),
          audience: args.audience,
        }),
      ),
    )
  }

  private async siopImportDefinitions(args: ImportDefinitionsArgs, context: IRequiredContext): Promise<void> {
    const { importItems, tenantId, version, versionControlMode } = args
    await Promise.all(
      importItems.map(async (importItem: ImportDcqlQueryItem) => {
        DcqlQuery.validate(importItem.query)
        console.log(`persisting DCQL definition ${importItem.queryId} with versionControlMode ${versionControlMode}`)

        return context.agent.pdmPersistDefinition({
          definitionItem: {
            queryId: importItem.queryId!,
            tenantId: tenantId,
            version: version,
            query: importItem.query,
          },
          opts: { versionControlMode: versionControlMode },
        })
      }),
    )
  }

  private async siopGetRedirectURI(args: IGetRedirectUriArgs, context: IRequiredContext): Promise<string | undefined> {
    const instanceId = args.queryId ?? SIOPv2RP._DEFAULT_OPTS_KEY
    if (this.instances.has(instanceId)) {
      const rpInstance = this.instances.get(instanceId)
      if (rpInstance !== undefined) {
        const rp = await rpInstance.get(context)
        return await rp.getResponseRedirectUri({
          correlation_id: args.correlationId,
          correlationId: args.correlationId,
          ...(args.state && { state: args.state }),
        })
      }
    }
    return undefined
  }

  async getRPInstance({ createWhenNotPresent, queryId, responseRedirectURI }: ISiopRPInstanceArgs, context: IRequiredContext): Promise<RPInstance> {
    let rpInstanceId: string = SIOPv2RP._DEFAULT_OPTS_KEY
    let rpInstance: RPInstance | undefined
    if (queryId) {
      if (this.instances.has(queryId)) {
        rpInstanceId = queryId
        rpInstance = this.instances.get(rpInstanceId)!
      } else if (isValidUUID(queryId)) {
        try {
          // Check whether queryId is actually the PD item id
          const pd = await context.agent.pdmGetDefinition({ itemId: queryId })
          if (this.instances.has(pd.queryId)) {
            rpInstanceId = pd.queryId
            rpInstance = this.instances.get(rpInstanceId)!
          }
        } catch (ignore) {}
      }
      if (createWhenNotPresent) {
        rpInstanceId = queryId
      } else {
        rpInstance = this.instances.get(rpInstanceId)
      }
    } else {
      rpInstance = this.instances.get(rpInstanceId)
    }

    if (!rpInstance) {
      if (!createWhenNotPresent) {
        return Promise.reject(`No RP instance found for key ${rpInstanceId}`)
      }
      const instanceOpts = this.getInstanceOpts(queryId)
      const rpOpts = await this.getRPOptions(context, { queryId, responseRedirectURI: responseRedirectURI })
      if (!rpOpts.identifierOpts.resolveOpts?.resolver || typeof rpOpts.identifierOpts.resolveOpts.resolver.resolve !== 'function') {
        if (!rpOpts.identifierOpts?.resolveOpts) {
          rpOpts.identifierOpts = { ...rpOpts.identifierOpts }
          rpOpts.identifierOpts.resolveOpts = { ...rpOpts.identifierOpts.resolveOpts }
        }
        console.log('Using agent DID resolver for RP instance with definition id ' + queryId)
        rpOpts.identifierOpts.resolveOpts.resolver = getAgentResolver(context, {
          uniresolverResolution: true,
          localResolution: true,
          resolverResolution: true,
        })
      }
      rpInstance = new RPInstance({ rpOpts, pexOpts: instanceOpts })
      this.instances.set(rpInstanceId, rpInstance)
    }
    if (responseRedirectURI) {
      rpInstance.rpOptions.responseRedirectUri = responseRedirectURI
    }
    return rpInstance
  }

  async getRPOptions(context: IRequiredContext, opts: { queryId?: string; responseRedirectURI?: string }): Promise<IRPOptions> {
    const { queryId, responseRedirectURI: responseRedirectURI } = opts
    const options = this.getInstanceOpts(queryId)?.rpOpts ?? this.opts.defaultOpts
    if (!options) {
      throw Error(`Could not get specific nor default options for definition ${queryId}`)
    }
    if (this.opts.defaultOpts) {
      if (!options.identifierOpts) {
        options.identifierOpts = this.opts.defaultOpts?.identifierOpts
      } else {
        if (!options.identifierOpts.idOpts) {
          options.identifierOpts.idOpts = this.opts.defaultOpts.identifierOpts.idOpts
        }
        if (!options.identifierOpts.supportedDIDMethods) {
          options.identifierOpts.supportedDIDMethods = this.opts.defaultOpts.identifierOpts.supportedDIDMethods
        }
        if (!options.supportedVersions) {
          options.supportedVersions = this.opts.defaultOpts.supportedVersions
        }
      }
      if (!options.identifierOpts.resolveOpts || typeof options.identifierOpts.resolveOpts.resolver?.resolve !== 'function') {
        options.identifierOpts.resolveOpts = {
          ...this.opts.defaultOpts.identifierOpts.resolveOpts,
          resolver:
            this.opts.defaultOpts.identifierOpts?.resolveOpts?.resolver ??
            getAgentResolver(context, { localResolution: true, resolverResolution: true, uniresolverResolution: true }),
        }
      }
    }
    if (responseRedirectURI !== undefined && responseRedirectURI !== options.responseRedirectUri) {
      options.responseRedirectUri = responseRedirectURI
    }
    return options
  }

  getInstanceOpts(queryId?: string): IPEXInstanceOptions | undefined {
    if (!this.opts.instanceOpts) return undefined

    const instanceOpt = queryId ? this.opts.instanceOpts.find((i) => i.queryId === queryId) : undefined

    return instanceOpt ?? this.getDefaultOptions(queryId)
  }

  private getDefaultOptions(queryId: string | undefined) {
    if (!this.opts.instanceOpts) return undefined

    const defaultOptions = this.opts.instanceOpts.find((i) => i.queryId === 'default')
    if (defaultOptions) {
      const clonedOptions = { ...defaultOptions }
      if (queryId !== undefined) {
        clonedOptions.queryId = queryId
      }
      return clonedOptions
    }

    return undefined
  }
}