import { has, intersection, isNumber, isObjectLike } from '#lodash'
import type { MaybeNullOrUndefined, Nullable } from '../../core/helpers/utilityTypes.js'
import type { PartialDeep } from 'type-fest'
import { UnformattableSerializedViewerStateError } from '../errors/index.js'
import { coerceUndefinedValuesToNull } from '../../core/index.js'

export const defaultViewModeEdgeColorValue = 'DEFAULT_EDGE_COLOR'

/** Redefining these is unfortunate. Especially since they are not part of viewer-core */
export enum MeasurementType {
  PERPENDICULAR = 0,
  POINTTOPOINT = 1,
  AREA = 2,
  POINT = 3
}

export interface MeasurementOptions {
  visible: boolean
  type?: MeasurementType
  vertexSnap?: boolean
  units?: string
  precision?: number
  chain?: boolean
}

export interface MeasurementData {
  type: MeasurementType
  startPoint: readonly [number, number, number] // vec3
  endPoint: readonly [number, number, number] // vec3
  startNormal: readonly [number, number, number] // vec3
  endNormal: readonly [number, number, number] // vec3
  value: number
  innerPoints?: (readonly [number, number, number])[] // array of vec3
  units?: string
  precision?: number
  uuid: string
}

export const defaultMeasurementOptions: Readonly<MeasurementOptions> = Object.freeze({
  visible: true,
  type: MeasurementType.POINTTOPOINT,
  vertexSnap: false,
  units: 'm',
  precision: 2
})

export interface SectionBoxData {
  min: number[]
  max: number[]
  rotation?: number[]
}

/**
 * v1 -> v1.1
 * - ui.filters.propertyFilter.isApplied field added
 * - ui.spotlightUserId swapped for spotlightUserSessionId
 * v1.1 -> v1.2
 * - ui.diff added
 * v1.2 -> v1.3
 * - ui.filters.selectedObjectIds removed in favor of ui.filters.selectedObjectApplicationIds
 * v1.3 -> 1.4
 * - ui.viewMode -> ui.viewMode.mode
 * - ui.viewMode has new keys: edgesEnabled, edgesWeight, outlineOpacity, edgesColor
 * v1.4 -> 1.5
 * - ui.measurement.measurements added
 * v1.5 -> 1.6
 * - ui.filters.propertyFilter -> propertyFilters
 * - activeColorFilterId added
 * v1.6 -> 1.7
 * - ui.filters.filterLogic added
 * - ui.filters.propertyFilters.condition updated
 * v1.7 -> 1.8
 * - ui.filters.propertyFilters.numericRange added
 */
export const SERIALIZED_VIEWER_STATE_VERSION = 1.8

export type SerializedViewerState = {
  projectId: string
  sessionId: string
  viewer: {
    metadata: {
      filteringState: Nullable<{
        passMin?: MaybeNullOrUndefined<number>
        passMax?: MaybeNullOrUndefined<number>
      }>
    }
  }
  resources: {
    request: {
      resourceIdString: string
      threadFilters: {
        includeArchived?: MaybeNullOrUndefined<boolean>
        loadedVersionsOnly?: MaybeNullOrUndefined<boolean>
      }
    }
  }
  ui: {
    threads: {
      openThread: {
        threadId: Nullable<string>
        isTyping: boolean
        newThreadEditor: boolean
      }
    }
    diff: {
      command: Nullable<string>
      time: number
      mode: number
    }
    spotlightUserSessionId: Nullable<string>
    filters: {
      isolatedObjectIds: string[]
      hiddenObjectIds: string[]
      /** Map of object id => application id or null, if no application id */
      selectedObjectApplicationIds: Record<string, string | null>
      propertyFilters: Array<{
        key: Nullable<string>
        isApplied: boolean
        selectedValues: string[]
        id: string
        condition: string
        numericRange?: { min: number; max: number }
      }>
      activeColorFilterId: Nullable<string>
      filterLogic: string
    }
    camera: {
      position: number[]
      target: number[]
      isOrthoProjection: boolean
      zoom: number
    }
    viewMode: {
      mode: number
      edgesEnabled: boolean
      edgesWeight: number
      outlineOpacity: number
      edgesColor: typeof defaultViewModeEdgeColorValue | number
    }
    sectionBox: Nullable<SectionBoxData>
    lightConfig: {
      intensity?: number
      indirectLightIntensity?: number
      elevation?: number
      azimuth?: number
    }
    explodeFactor: number
    selection: Nullable<number[]>
    measurement: {
      enabled: boolean
      options: Nullable<MeasurementOptions>
      measurements: Array<MeasurementData>
    }
  }
}

export type VersionedSerializedViewerState = {
  version: number
  state: SerializedViewerState
}

type UnformattedState = PartialDeep<
  SerializedViewerState & {
    // Properties removed from earlier viewer state versions
    ui: {
      filters: {
        selectedObjectIds: string[]
        // Legacy single propertyFilter for migration
        propertyFilter: {
          key: Nullable<string>
          isApplied: boolean
        }
      }
    }
  }
>

/**
 * Note: This only does superficial validation. To really ensure that all of the keys are there, even if prefilled with default values, make sure you invoke
 * formatSerializedViewerState() on the state afterwards
 */
export const isSerializedViewerState = (val: unknown): val is SerializedViewerState => {
  if (!val) return false
  const keys: Array<keyof SerializedViewerState> = [
    'projectId',
    'sessionId',
    'resources',
    'ui',
    'viewer'
  ]
  if (!isObjectLike(val)) return false

  const valKeys = Object.keys(val as Record<string, unknown>)
  if (intersection(valKeys, keys).length !== keys.length) return false

  return true
}

const initializeMissingData = (state: UnformattedState): SerializedViewerState => {
  const throwInvalidError = (missingPath: string): never => {
    throw new UnformattableSerializedViewerStateError(
      'Required data missing from SerializedViewerState: ' + missingPath
    )
  }

  const measurementOptions = {
    ...defaultMeasurementOptions,
    ...state.ui?.measurement?.options
  }

  const selectedObjectApplicationIds = {
    // Parse legacy object ids array as object
    ...(state.ui?.filters?.selectedObjectIds?.reduce((ret, id) => {
      ret[id] = null
      return ret
    }, {} as Record<string, string | null>) ?? {}),
    // Sanitize incoming object
    ...coerceUndefinedValuesToNull(
      state.ui?.filters?.selectedObjectApplicationIds || {}
    )
  }

  const viewModeType = isNumber(state.ui?.viewMode)
    ? state.ui.viewMode
    : state.ui?.viewMode?.mode

  const viewModeSettings = isNumber(state.ui?.viewMode) ? {} : state.ui?.viewMode

  return {
    projectId: state.projectId || throwInvalidError('projectId'),
    sessionId: state.sessionId || `nullSessionId-${Math.random() * 1000}`,
    viewer: {
      ...(state.viewer || {}),
      metadata: {
        ...(state.viewer?.metadata || {}),
        filteringState: state.viewer?.metadata?.filteringState || null
      }
    },
    resources: {
      ...(state.resources || {}),
      request: {
        ...(state.resources?.request || {}),
        resourceIdString:
          state.resources?.request?.resourceIdString ||
          throwInvalidError('resources.request.resourceIdString'),
        threadFilters: {
          ...(state.resources?.request?.threadFilters || {}),
          includeArchived:
            state.resources?.request?.threadFilters?.includeArchived || false,
          loadedVersionsOnly:
            state.resources?.request?.threadFilters?.loadedVersionsOnly || false
        }
      }
    },
    ui: {
      ...(state.ui || {}),
      threads: {
        ...(state.ui?.threads || {}),
        openThread: {
          ...(state.ui?.threads?.openThread || {}),
          threadId: state.ui?.threads?.openThread?.threadId || null,
          isTyping: state.ui?.threads?.openThread?.isTyping || false,
          newThreadEditor: state.ui?.threads?.openThread?.newThreadEditor || false
        }
      },
      diff: {
        ...(state.ui?.diff || {}),
        command: state.ui?.diff?.command || null,
        time: state.ui?.diff?.time || 0.5,
        mode: state.ui?.diff?.mode || 1
      },
      spotlightUserSessionId: state.ui?.spotlightUserSessionId || null,
      filters: (() => {
        const baseFilters = {
          ...(state.ui?.filters || {}),
          isolatedObjectIds: state.ui?.filters?.isolatedObjectIds || [],
          hiddenObjectIds: state.ui?.filters?.hiddenObjectIds || [],
          selectedObjectApplicationIds,
          activeColorFilterId: state.ui?.filters?.activeColorFilterId || null
        }

        // Migration logic: handle legacy propertyFilter and new propertyFilters
        let propertyFilters: Array<{
          key: Nullable<string>
          isApplied: boolean
          selectedValues: string[]
          id: string
          condition: string
          numericRange?: { min: number; max: number }
        }> = []

        // If new propertyFilters exist and are not empty, use them
        if (
          state.ui?.filters?.propertyFilters &&
          Array.isArray(state.ui.filters.propertyFilters) &&
          state.ui.filters.propertyFilters.length > 0
        ) {
          // Map legacy condition values to new format
          propertyFilters = state.ui.filters.propertyFilters.map((filter) => ({
            ...filter,
            condition:
              filter.condition === 'AND'
                ? 'is'
                : filter.condition === 'OR'
                ? 'is'
                : filter.condition
          }))
        }
        // If legacy propertyFilter exists but no propertyFilters (or empty propertyFilters), migrate it
        else if (state.ui?.filters?.propertyFilter?.key) {
          propertyFilters = [
            {
              key: state.ui.filters.propertyFilter.key,
              isApplied: state.ui.filters.propertyFilter.isApplied || false,
              selectedValues: [], // Legacy didn't have selectedValues
              id: 'legacy-filter', // Generate a consistent ID for legacy filter
              condition: 'is'
            }
          ]
        }

        return {
          ...baseFilters,
          propertyFilters,
          filterLogic: state.ui?.filters?.filterLogic || 'all'
        }
      })(),
      camera: {
        ...(state.ui?.camera || {}),
        position: state.ui?.camera?.position || throwInvalidError('ui.camera.position'),
        target: state.ui?.camera?.target || throwInvalidError('ui.camera.target'),
        isOrthoProjection: state.ui?.camera?.isOrthoProjection || false,
        zoom: state.ui?.camera?.zoom || 1
      },
      viewMode: {
        mode: viewModeType ?? 0,
        edgesEnabled: viewModeSettings?.edgesEnabled ?? true,
        edgesWeight: viewModeSettings?.edgesWeight ?? 1,
        outlineOpacity: viewModeSettings?.outlineOpacity ?? 0.75,
        edgesColor: viewModeSettings?.edgesColor ?? defaultViewModeEdgeColorValue
      },
      sectionBox:
        state.ui?.sectionBox?.min?.length && state.ui?.sectionBox.max?.length
          ? // Complains otherwise
            (state.ui.sectionBox as SectionBoxData)
          : null,
      lightConfig: {
        ...(state.ui?.lightConfig || {}),
        intensity: state.ui?.lightConfig?.intensity,
        indirectLightIntensity: state.ui?.lightConfig?.indirectLightIntensity,
        elevation: state.ui?.lightConfig?.elevation,
        azimuth: state.ui?.lightConfig?.azimuth
      },
      explodeFactor: state.ui?.explodeFactor || 0,
      selection: state.ui?.selection || null,
      measurement: {
        enabled: state.ui?.measurement?.enabled ?? false,
        options: measurementOptions,
        measurements: state.ui?.measurement?.measurements || []
      }
    }
  }
}

/**
 * Formats SerializedViewerState by bringing it up to date with the structure of the latest version
 * and ensuring missing keys are initialized with default values
 */
export const formatSerializedViewerState = (
  state: UnformattedState
): SerializedViewerState => {
  const finalState = initializeMissingData(state)
  return finalState
}

export const inputToVersionedState = (
  inputSerializedViewerState: unknown
): Nullable<VersionedSerializedViewerState> => {
  const state = isSerializedViewerState(inputSerializedViewerState)
    ? formatSerializedViewerState(inputSerializedViewerState)
    : null
  if (!state) return null

  return {
    version: SERIALIZED_VIEWER_STATE_VERSION,
    state
  }
}

export const isVersionedSerializedViewerState = (
  data: unknown
): data is VersionedSerializedViewerState => {
  if (!data || !isObjectLike(data)) return false
  if (!has(data, 'version')) return false
  const stateRaw = (data as Record<string, unknown>).state
  return isSerializedViewerState(stateRaw)
}