import { ref } from 'vue'
import { useApi } from './useApi'
import { useToast } from './useToast'
import { extractCollection } from '~/shared/utils/apiHelpers'

export interface Document {
  id: string
  name: string
  filename: string
  mimeType: string
  size: number
  fileUrl: string
  downloadUrl: string
  /** @deprecated Legacy Base64 data URI — use fileUrl instead */
  path?: string
  createdAt?: string
  siteId?: string
  machineId?: string
  composantId?: string
  productId?: string
  pieceId?: string
  site?: { id: string; name?: string } | null
  machine?: { id: string; name?: string } | null
  composant?: { id: string; name?: string } | null
  piece?: { id: string; name?: string } | null
  product?: { id: string; name?: string } | null
}

export interface UploadContext {
  siteId?: string
  machineId?: string
  composantId?: string
  productId?: string
  pieceId?: string
}

export interface DocumentResult {
  success: boolean
  data?: Document | Document[]
  error?: string
}

interface LoadDocumentsOptions {
  search?: string
  page?: number
  itemsPerPage?: number
  orderBy?: string
  orderDir?: 'asc' | 'desc'
  attachmentFilter?: string
  force?: boolean
}

const documents = ref<Document[]>([])
const total = ref(0)
const loading = ref(false)
const loaded = ref(false)

const extractTotal = (payload: unknown, fallbackLength: number): number => {
  const p = payload as Record<string, unknown> | null
  if (typeof p?.totalItems === 'number') return p.totalItems
  if (typeof p?.['hydra:totalItems'] === 'number') return p['hydra:totalItems']
  return fallbackLength
}

export function useDocuments() {
  const { get, postFormData, delete: del } = useApi()
  const { showError, showSuccess } = useToast()

  const loadFromEndpoint = async (
    endpoint: string,
    { updateStore = false, itemsPerPage }: { updateStore?: boolean; itemsPerPage?: number } = {},
  ): Promise<DocumentResult> => {
    loading.value = true
    try {
      const url = itemsPerPage ? `${endpoint}${endpoint.includes('?') ? '&' : '?'}itemsPerPage=${itemsPerPage}` : endpoint
      const result = await get(url)
      if (result.success) {
        const data = extractCollection(result.data)
        if (updateStore) {
          documents.value = data
        }
        return { success: true, data }
      }
      if (result.error) {
        showError(result.error)
      }
      return result as DocumentResult
    } catch (error) {
      const err = error as Error
      console.error(`Erreur lors du chargement des documents (${endpoint}):`, error)
      showError('Impossible de charger les documents')
      return { success: false, error: err.message }
    } finally {
      loading.value = false
    }
  }

  const loadDocuments = async (options: LoadDocumentsOptions = {}): Promise<DocumentResult> => {
    const {
      search = '',
      page = 1,
      itemsPerPage = 30,
      orderBy = 'createdAt',
      orderDir = 'desc',
      attachmentFilter = 'all',
      force = false,
    } = options

    if (!force && loaded.value && !search && page === 1 && attachmentFilter === 'all') {
      return { success: true, data: documents.value }
    }

    if (loading.value) {
      return { success: true, data: documents.value }
    }

    loading.value = true
    try {
      const params = new URLSearchParams()
      params.set('itemsPerPage', String(itemsPerPage))
      params.set('page', String(page))

      if (search && search.trim()) {
        params.set('name', search.trim())
      }

      if (attachmentFilter && attachmentFilter !== 'all') {
        params.set(`exists[${attachmentFilter}]`, 'true')
      }

      params.set(`order[${orderBy}]`, orderDir)

      const result = await get(`/documents?${params.toString()}`)
      if (result.success) {
        const items = extractCollection(result.data)
        documents.value = items
        total.value = extractTotal(result.data, items.length)
        loaded.value = true
        return { success: true, data: items }
      }
      if (result.error) {
        showError(result.error)
      }
      return result as DocumentResult
    } catch (error) {
      const err = error as Error
      console.error('Erreur lors du chargement des documents:', error)
      showError('Impossible de charger les documents')
      return { success: false, error: err.message }
    } finally {
      loading.value = false
    }
  }

  const loadDocumentsBySite = async (
    siteId: string,
    options: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    if (!siteId) {
      return { success: false, error: 'Aucun site sélectionné' }
    }
    return loadFromEndpoint(`/documents/site/${siteId}`, { updateStore: options.updateStore ?? false })
  }

  const loadDocumentsByMachine = async (
    machineId: string,
    options: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    if (!machineId) {
      return { success: false, error: 'Aucune machine sélectionnée' }
    }
    return loadFromEndpoint(`/documents/machine/${machineId}`, { updateStore: options.updateStore ?? false })
  }

  const loadDocumentsByComponent = async (
    componentId: string,
    options: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    if (!componentId) {
      return { success: false, error: 'Aucun composant sélectionné' }
    }
    return loadFromEndpoint(`/documents/composant/${componentId}`, { updateStore: options.updateStore ?? false })
  }

  const loadDocumentsByProduct = async (
    productId: string,
    options: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    if (!productId) {
      return { success: false, error: 'Aucun produit sélectionné' }
    }
    return loadFromEndpoint(`/documents/product/${productId}`, { updateStore: options.updateStore ?? false })
  }

  const loadDocumentsByPiece = async (
    pieceId: string,
    options: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    if (!pieceId) {
      return { success: false, error: 'Aucune pièce sélectionnée' }
    }
    return loadFromEndpoint(`/documents/piece/${pieceId}`, { updateStore: options.updateStore ?? false })
  }

  const uploadDocuments = async (
    { files, context = {} }: { files: File[]; context?: UploadContext },
    { updateStore = false }: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    if (!files.length) {
      return { success: false, error: 'Aucun fichier sélectionné' }
    }

    loading.value = true
    const created: Document[] = []

    try {
      for (const file of files) {
        const formData = new FormData()
        formData.append('file', file)
        formData.append('name', file.name)

        if (context.siteId) formData.append('siteId', context.siteId)
        if (context.machineId) formData.append('machineId', context.machineId)
        if (context.composantId) formData.append('composantId', context.composantId)
        if (context.productId) formData.append('productId', context.productId)
        if (context.pieceId) formData.append('pieceId', context.pieceId)

        const result = await postFormData('/documents', formData)
        if (result.success) {
          created.push(result.data as Document)
          showSuccess(`Document "${file.name}" ajouté`)
        } else if (result.error) {
          showError(`Erreur sur ${file.name} : ${result.error}`)
        }
      }

      if (created.length) {
        if (updateStore) {
          documents.value = [...created, ...documents.value]
        }
        return { success: true, data: created }
      }

      return { success: false, error: 'Aucun document ajouté' }
    } catch (error) {
      const err = error as Error
      console.error("Erreur lors de l'upload des documents:", error)
      showError("Échec de l'ajout des documents")
      return { success: false, error: err.message }
    } finally {
      loading.value = false
    }
  }

  const deleteDocument = async (
    id: string | number,
    { updateStore = false }: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    if (!id) {
      return { success: false, error: 'Identifiant manquant' }
    }

    loading.value = true
    try {
      const result = await del(`/documents/${id}`)
      if (result.success) {
        if (updateStore) {
          documents.value = documents.value.filter((doc) => doc.id !== id)
        }
        showSuccess('Document supprimé')
      }
      return result as DocumentResult
    } catch (error) {
      const err = error as Error
      console.error('Erreur lors de la suppression du document:', error)
      showError('Impossible de supprimer le document')
      return { success: false, error: err.message }
    } finally {
      loading.value = false
    }
  }

  return {
    documents,
    total,
    loading,
    loaded,
    loadDocuments,
    loadDocumentsBySite,
    loadDocumentsByMachine,
    loadDocumentsByComponent,
    loadDocumentsByPiece,
    loadDocumentsByProduct,
    uploadDocuments,
    deleteDocument,
  }
}