import { ref } from 'vue'
import { useToast } from './useToast'
import { useApi } from './useApi'
import { buildConstructeurRequestPayload, uniqueConstructeurIds } from '~/shared/constructeurUtils'
import { useConstructeurs } from './useConstructeurs'
import { extractRelationId, normalizeRelationIds } from '~/shared/apiRelations'

const pieces = ref([])
const total = ref(0)
const loading = ref(false)

const extractCollection = (payload) => {
  if (Array.isArray(payload)) {
    return payload
  }
  if (Array.isArray(payload?.member)) {
    return payload.member
  }
  if (Array.isArray(payload?.['hydra:member'])) {
    return payload['hydra:member']
  }
  if (Array.isArray(payload?.data)) {
    return payload.data
  }
  return []
}

const extractTotal = (payload, fallbackLength) => {
  if (typeof payload?.totalItems === 'number') {
    return payload.totalItems
  }
  if (typeof payload?.['hydra:totalItems'] === 'number') {
    return payload['hydra:totalItems']
  }
  return fallbackLength
}

export function usePieces () {
  const { showSuccess, showError, showInfo } = useToast()
  const { get, post, patch, delete: del } = useApi()
  const { ensureConstructeurs } = useConstructeurs()

  const withResolvedConstructeurs = async (piece) => {
    if (!piece || typeof piece !== 'object') {
      return piece
    }
    if (!piece.typePieceId) {
      const typePieceId = extractRelationId(piece.typePiece)
      if (typePieceId) {
        piece.typePieceId = typePieceId
      }
    }
    if (!piece.productId) {
      const productId = extractRelationId(piece.product)
      if (productId) {
        piece.productId = productId
      }
    }
    const productIds = Array.isArray(piece.productIds) ? piece.productIds.filter(Boolean) : []
    if (productIds.length === 0 && piece.productId) {
      piece.productIds = [piece.productId]
    } else if (productIds.length > 0) {
      piece.productIds = productIds.map((id) => String(id))
      if (!piece.productId) {
        piece.productId = piece.productIds[0] || null
      }
    }
    const ids = uniqueConstructeurIds(
      piece.constructeurIds,
      piece.constructeurs,
      piece.constructeur,
    )
    const hasResolvedConstructeurs =
      Array.isArray(piece.constructeurs)
      && piece.constructeurs.length > 0
      && piece.constructeurs.every((item) => item && typeof item === 'object')

    if (ids.length && !hasResolvedConstructeurs) {
      const resolved = await ensureConstructeurs(ids)
      if (resolved.length) {
        piece.constructeurs = resolved
        piece.constructeurIds = ids
      }
    }
    return piece
  }

  /**
   * Load pieces with pagination and search support
   * @param {Object} options - Query options
   * @param {string} [options.search] - Search term for name/reference
   * @param {number} [options.page=1] - Current page (1-based)
   * @param {number} [options.itemsPerPage=30] - Items per page
   * @param {string} [options.orderBy='name'] - Field to order by
   * @param {string} [options.orderDir='asc'] - Order direction (asc/desc)
   */
  const loadPieces = async (options = {}) => {
    loading.value = true
    try {
      const {
        search = '',
        page = 1,
        itemsPerPage = 30,
        orderBy = 'name',
        orderDir = 'asc'
      } = options

      const params = new URLSearchParams()
      params.set('itemsPerPage', String(itemsPerPage))
      params.set('page', String(page))

      if (search && search.trim()) {
        // API Platform uses property filters
        params.set('name', search.trim())
      }

      // API Platform OrderFilter syntax: order[field]=direction
      params.set(`order[${orderBy}]`, orderDir)

      const result = await get(`/pieces?${params.toString()}`)
      if (result.success) {
        const items = extractCollection(result.data)
        const enrichedItems = await Promise.all(items.map((item) => withResolvedConstructeurs(item)))
        pieces.value = enrichedItems
        total.value = extractTotal(result.data, items.length)
        return {
          success: true,
          data: {
            items: enrichedItems,
            total: total.value,
            page,
            itemsPerPage
          }
        }
      }
      return result
    } catch (error) {
      console.error('Erreur lors du chargement des pièces:', error)
      return { success: false, error: error.message }
    } finally {
      loading.value = false
    }
  }

  const createPiece = async (pieceData) => {
    loading.value = true
    try {
      const normalizedPayload = normalizeRelationIds(buildConstructeurRequestPayload(pieceData))
      const result = await post('/pieces', normalizedPayload)
      if (result.success) {
        const enriched = await withResolvedConstructeurs(result.data)
        pieces.value.unshift(enriched)
        total.value += 1
        const displayName = result.data?.name
          || pieceData?.definition?.name
          || pieceData?.name
          || 'Pièce'
        showSuccess(`Pièce "${displayName}" créée avec succès`)
      }
      return result
    } catch (error) {
      console.error('Erreur lors de la création de la pièce:', error)
      return { success: false, error: error.message }
    } finally {
      loading.value = false
    }
  }

  const updatePieceData = async (id, pieceData) => {
    loading.value = true
    try {
      const normalizedPayload = normalizeRelationIds(buildConstructeurRequestPayload(pieceData))
      const result = await patch(`/pieces/${id}`, normalizedPayload)
      if (result.success) {
        const updated = await withResolvedConstructeurs(result.data)
        const index = pieces.value.findIndex(piece => piece.id === id)
        if (index !== -1) {
          pieces.value[index] = updated
        }
        showSuccess(`Pièce "${updated?.name || pieceData.name || ''}" mise à jour avec succès`)
      }
      return result
    } catch (error) {
      console.error('Erreur lors de la mise à jour de la pièce:', error)
      return { success: false, error: error.message }
    } finally {
      loading.value = false
    }
  }

  const deletePiece = async (id) => {
    loading.value = true
    try {
      const result = await del(`/pieces/${id}`)
      if (result.success) {
        const deletedPiece = pieces.value.find(piece => piece.id === id)
        pieces.value = pieces.value.filter(piece => piece.id !== id)
        total.value = Math.max(0, total.value - 1)
        showSuccess(`Pièce "${deletedPiece?.name || 'inconnu'}" supprimée avec succès`)
      }
      return result
    } catch (error) {
      console.error('Erreur lors de la suppression de la pièce:', error)
      return { success: false, error: error.message }
    } finally {
      loading.value = false
    }
  }

  const getPieces = () => pieces.value
  const isLoading = () => loading.value

  return {
    pieces,
    total,
    loading,
    loadPieces,
    createPiece,
    updatePiece: updatePieceData,
    deletePiece,
    getPieces,
    isLoading
  }
}