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

export interface Document {
  id: string
  name: string
  filename: string
  mimeType: string
  size: number
  path: string
  siteId?: string
  machineId?: string
  composantId?: string
  productId?: string
  pieceId?: string
}

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

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

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

const fileToBase64 = (file: File): Promise<string> =>
  new Promise((resolve, reject) => {
    const reader = new FileReader()
    reader.onload = () => resolve(reader.result as string)
    reader.onerror = () => reject(new Error(`Lecture du fichier ${file.name} impossible`))
    reader.readAsDataURL(file)
  })

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

  const loadFromEndpoint = async (
    endpoint: string,
    { updateStore = false }: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    loading.value = true
    try {
      const result = await get(endpoint)
      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: { updateStore?: boolean } = {},
  ): Promise<DocumentResult> => {
    return loadFromEndpoint('/documents', { updateStore: options.updateStore ?? true })
  }

  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 dataUrl = await fileToBase64(file)

        const payload = normalizeRelationIds({
          name: file.name,
          filename: file.name,
          mimeType: file.type || 'application/octet-stream',
          size: file.size,
          path: dataUrl,
          ...context,
        })

        const result = await post('/documents', payload)
        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,
    loading,
    loadDocuments,
    loadDocumentsBySite,
    loadDocumentsByMachine,
    loadDocumentsByComponent,
    loadDocumentsByPiece,
    loadDocumentsByProduct,
    uploadDocuments,
    deleteDocument,
  }
}