import { Injectable, inject } from '@angular/core'
import { Observable } from 'rxjs'
import { map } from 'rxjs/operators'
import { AuditLogEntry } from 'src/app/data/auditlog-entry'
import { CustomField } from 'src/app/data/custom-field'
import {
  DOCUMENT_SORT_FIELDS,
  DOCUMENT_SORT_FIELDS_FULLTEXT,
  Document,
  DocumentVersionInfo,
} from 'src/app/data/document'
import { DocumentMetadata } from 'src/app/data/document-metadata'
import { DocumentSuggestions } from 'src/app/data/document-suggestions'
import { FilterRule } from 'src/app/data/filter-rule'
import { Results } from 'src/app/data/results'
import { SETTINGS_KEYS } from 'src/app/data/ui-settings'
import { queryParamsFromFilterRules } from '../../utils/query-params'
import {
  PermissionAction,
  PermissionType,
  PermissionsService,
} from '../permissions.service'
import { SettingsService } from '../settings.service'
import { AbstractPaperlessService } from './abstract-paperless-service'
import { CustomFieldsService } from './custom-fields.service'

export interface SelectionDataItem {
  id: number
  document_count: number
}

export interface SelectionData {
  selected_storage_paths: SelectionDataItem[]
  selected_correspondents: SelectionDataItem[]
  selected_tags: SelectionDataItem[]
  selected_document_types: SelectionDataItem[]
  selected_custom_fields: SelectionDataItem[]
}

export enum BulkEditSourceMode {
  LATEST_VERSION = 'latest_version',
  EXPLICIT_SELECTION = 'explicit_selection',
}

export type DocumentBulkEditMethod =
  | 'set_correspondent'
  | 'set_document_type'
  | 'set_storage_path'
  | 'add_tag'
  | 'remove_tag'
  | 'modify_tags'
  | 'modify_custom_fields'
  | 'set_permissions'

export interface MergeDocumentsRequest {
  metadata_document_id?: number
  delete_originals?: boolean
  archive_fallback?: boolean
  source_mode?: BulkEditSourceMode
}

export interface EditPdfOperation {
  page: number
  rotate?: number
  doc?: number
}

export interface EditPdfDocumentsRequest {
  operations: EditPdfOperation[]
  delete_original?: boolean
  update_document?: boolean
  include_metadata?: boolean
  source_mode?: BulkEditSourceMode
}

export interface RemovePasswordDocumentsRequest {
  password: string
  update_document?: boolean
  delete_original?: boolean
  include_metadata?: boolean
  source_mode?: BulkEditSourceMode
}

@Injectable({
  providedIn: 'root',
})
export class DocumentService extends AbstractPaperlessService<Document> {
  private permissionsService = inject(PermissionsService)
  private settingsService = inject(SettingsService)
  private customFieldService = inject(CustomFieldsService)

  private _searchQuery: string

  private _sortFields
  get sortFields() {
    return this._sortFields
  }

  private _sortFieldsFullText
  get sortFieldsFullText() {
    return this._sortFieldsFullText
  }

  private customFields: CustomField[] = []

  constructor() {
    super()
    this.resourceName = 'documents'
    this.reload()
  }

  public reload() {
    if (
      this.permissionsService.currentUserCan(
        PermissionAction.View,
        PermissionType.CustomField
      )
    ) {
      this.customFieldService.listAll().subscribe((fields) => {
        this.customFields = fields.results
        this.setupSortFields()
      })
    }

    this.setupSortFields()
  }

  private setupSortFields() {
    this._sortFields = [...DOCUMENT_SORT_FIELDS]
    if (
      this.permissionsService.currentUserCan(
        PermissionAction.View,
        PermissionType.CustomField
      )
    ) {
      this.customFields.forEach((field) => {
        this._sortFields.push({
          field: `custom_field_${field.id}`,
          name: field.name,
        })
      })
    }
    let excludes = []
    if (
      !this.permissionsService.currentUserCan(
        PermissionAction.View,
        PermissionType.Correspondent
      )
    ) {
      excludes.push('correspondent__name')
    }
    if (
      !this.permissionsService.currentUserCan(
        PermissionAction.View,
        PermissionType.DocumentType
      )
    ) {
      excludes.push('document_type__name')
    }
    if (
      !this.permissionsService.currentUserCan(
        PermissionAction.View,
        PermissionType.User
      )
    ) {
      excludes.push('owner')
    }
    if (!this.settingsService.get(SETTINGS_KEYS.NOTES_ENABLED)) {
      excludes.push('num_notes')
    }
    this._sortFields = this._sortFields.filter(
      (field) => !excludes.includes(field.field)
    )
    this._sortFieldsFullText = [
      ...this._sortFields,
      ...DOCUMENT_SORT_FIELDS_FULLTEXT,
    ]
  }

  listFiltered(
    page?: number,
    pageSize?: number,
    sortField?: string,
    sortReverse?: boolean,
    filterRules?: FilterRule[],
    extraParams = {}
  ): Observable<Results<Document>> {
    return this.list(
      page,
      pageSize,
      sortField,
      sortReverse,
      Object.assign(extraParams, queryParamsFromFilterRules(filterRules))
    )
  }

  listAllFilteredIds(filterRules?: FilterRule[]): Observable<number[]> {
    return this.listFiltered(1, 100000, null, null, filterRules, {
      fields: 'id',
    }).pipe(map((response) => response.results.map((doc) => doc.id)))
  }

  get(
    id: number,
    versionID: number = null,
    fields: string = null
  ): Observable<Document> {
    const params: { full_perms: boolean; version?: string; fields?: string } = {
      full_perms: true,
    }
    if (versionID) {
      params.version = versionID.toString()
    }
    if (fields) {
      params.fields = fields
    }
    return this.http.get<Document>(this.getResourceUrl(id), {
      params,
    })
  }

  getPreviewUrl(
    id: number,
    original: boolean = false,
    versionID: number = null
  ): string {
    let url = new URL(this.getResourceUrl(id, 'preview'))
    if (this._searchQuery) url.hash = `#search="${this.searchQuery}"`
    if (original) {
      url.searchParams.append('original', 'true')
    }
    if (versionID) {
      url.searchParams.append('version', versionID.toString())
    }
    return url.toString()
  }

  getThumbUrl(id: number, versionID: number = null): string {
    let url = new URL(this.getResourceUrl(id, 'thumb'))
    if (versionID) {
      url.searchParams.append('version', versionID.toString())
    }
    return url.toString()
  }

  getDownloadUrl(
    id: number,
    original: boolean = false,
    versionID: number = null,
    followFormatting: boolean = false
  ): string {
    let url = new URL(this.getResourceUrl(id, 'download'))
    if (original) {
      url.searchParams.append('original', 'true')
    }
    if (versionID) {
      url.searchParams.append('version', versionID.toString())
    }
    if (followFormatting) {
      url.searchParams.append('follow_formatting', 'true')
    }
    return url.toString()
  }

  uploadVersion(documentId: number, file: File, versionLabel?: string) {
    const formData = new FormData()
    formData.append('document', file, file.name)
    if (versionLabel) {
      formData.append('version_label', versionLabel)
    }
    return this.http.post<string>(
      this.getResourceUrl(documentId, 'update_version'),
      formData
    )
  }

  getVersions(documentId: number): Observable<Document> {
    return this.http.get<Document>(this.getResourceUrl(documentId), {
      params: {
        fields: 'id,versions',
      },
    })
  }

  getRootId(documentId: number) {
    return this.http.get<{ root_id: number }>(
      this.getResourceUrl(documentId, 'root')
    )
  }

  deleteVersion(rootDocumentId: number, versionId: number) {
    return this.http.delete<{ result: string; current_version_id: number }>(
      this.getResourceUrl(rootDocumentId, `versions/${versionId}`)
    )
  }

  updateVersionLabel(
    rootDocumentId: number,
    versionId: number,
    versionLabel: string | null
  ): Observable<DocumentVersionInfo> {
    return this.http.patch<DocumentVersionInfo>(
      this.getResourceUrl(rootDocumentId, `versions/${versionId}`),
      { version_label: versionLabel }
    )
  }

  getNextAsn(): Observable<number> {
    return this.http.get<number>(this.getResourceUrl(null, 'next_asn'))
  }

  patch(o: Document, versionID: number = null): Observable<Document> {
    o.remove_inbox_tags = !!this.settingsService.get(
      SETTINGS_KEYS.DOCUMENT_EDITING_REMOVE_INBOX_TAGS
    )
    this.clearCache()
    return this.http.patch<Document>(this.getResourceUrl(o.id), o, {
      params: versionID ? { version: versionID.toString() } : {},
    })
  }

  uploadDocument(formData) {
    return this.http.post(
      this.getResourceUrl(null, 'post_document'),
      formData,
      { reportProgress: true, observe: 'events' }
    )
  }

  getMetadata(
    id: number,
    versionID: number = null
  ): Observable<DocumentMetadata> {
    let url = new URL(this.getResourceUrl(id, 'metadata'))
    if (versionID) {
      url.searchParams.append('version', versionID.toString())
    }
    return this.http.get<DocumentMetadata>(url.toString())
  }

  bulkEdit(ids: number[], method: DocumentBulkEditMethod, args: any) {
    return this.http.post(this.getResourceUrl(null, 'bulk_edit'), {
      documents: ids,
      method: method,
      parameters: args,
    })
  }

  deleteDocuments(ids: number[]) {
    return this.http.post(this.getResourceUrl(null, 'delete'), {
      documents: ids,
    })
  }

  reprocessDocuments(ids: number[]) {
    return this.http.post(this.getResourceUrl(null, 'reprocess'), {
      documents: ids,
    })
  }

  rotateDocuments(
    ids: number[],
    degrees: number,
    sourceMode: BulkEditSourceMode = BulkEditSourceMode.LATEST_VERSION
  ) {
    return this.http.post(this.getResourceUrl(null, 'rotate'), {
      documents: ids,
      degrees,
      source_mode: sourceMode,
    })
  }

  mergeDocuments(ids: number[], request: MergeDocumentsRequest = {}) {
    return this.http.post(this.getResourceUrl(null, 'merge'), {
      documents: ids,
      ...request,
    })
  }

  editPdfDocuments(ids: number[], request: EditPdfDocumentsRequest) {
    return this.http.post(this.getResourceUrl(null, 'edit_pdf'), {
      documents: ids,
      ...request,
    })
  }

  removePasswordDocuments(
    ids: number[],
    request: RemovePasswordDocumentsRequest
  ) {
    return this.http.post(this.getResourceUrl(null, 'remove_password'), {
      documents: ids,
      ...request,
    })
  }

  getSelectionData(ids: number[]): Observable<SelectionData> {
    return this.http.post<SelectionData>(
      this.getResourceUrl(null, 'selection_data'),
      { documents: ids }
    )
  }

  getSuggestions(id: number): Observable<DocumentSuggestions> {
    return this.http.get<DocumentSuggestions>(
      this.getResourceUrl(id, 'suggestions')
    )
  }

  getHistory(id: number): Observable<AuditLogEntry[]> {
    return this.http.get<AuditLogEntry[]>(this.getResourceUrl(id, 'history'))
  }

  bulkDownload(
    ids: number[],
    content = 'both',
    useFilenameFormatting: boolean = false
  ) {
    return this.http.post(
      this.getResourceUrl(null, 'bulk_download'),
      {
        documents: ids,
        content: content,
        follow_formatting: useFilenameFormatting,
      },
      { responseType: 'blob' }
    )
  }

  public set searchQuery(query: string) {
    this._searchQuery = query.trim()
  }

  public get searchQuery(): string {
    return this._searchQuery
  }

  emailDocuments(
    documentIds: number[],
    addresses: string,
    subject: string,
    message: string,
    useArchiveVersion: boolean
  ): Observable<any> {
    return this.http.post(this.getResourceUrl(null, 'email'), {
      documents: documentIds,
      addresses: addresses,
      subject: subject,
      message: message,
      use_archive_version: useArchiveVersion,
    })
  }
}