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

const products = ref([])
const total = ref(0)
const loading = ref(false)
const loaded = ref(false)
const error = ref(null)

const replaceInCache = (item) => {
  if (!item?.id) {
    return false
  }
  const index = products.value.findIndex((product) => product.id === item.id)
  if (index === -1) {
    products.value.unshift(item)
    return true
  }
  const clone = products.value.slice()
  clone[index] = item
  products.value = clone
  return false
}

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

  const withResolvedConstructeurs = async (product) => {
    if (!product || typeof product !== 'object') {
      return product
    }
    const ids = uniqueConstructeurIds(
      product.constructeurIds,
      product.constructeurs,
      product.constructeur,
    )
    const hasConstructeurs =
      Array.isArray(product.constructeurs) && product.constructeurs.length > 0

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

  const loadProducts = async (options = {}) => {
    if (loading.value) {
      return {
        success: true,
        data: { items: products.value, total: total.value },
      }
    }
    if (loaded.value && !options.force) {
      return {
        success: true,
        data: { items: products.value, total: total.value },
      }
    }

    loading.value = true
    error.value = null
    try {
      const result = await get('/products?limit=100')
      if (result.success) {
        const items = Array.isArray(result.data?.items) ? result.data.items : []
        const enrichedItems = await Promise.all(items.map((item) => withResolvedConstructeurs(item)))
        products.value = enrichedItems
        total.value = typeof result.data?.total === 'number' ? result.data.total : items.length
        loaded.value = true
      } else if (result.error) {
        error.value = result.error
        showError(`Impossible de charger les produits: ${result.error}`)
      }
      return result
    } catch (err) {
      console.error('Erreur lors du chargement des produits:', err)
      const message = err?.message ?? 'Erreur inconnue'
      error.value = message
      showError(`Impossible de charger les produits: ${message}`)
      return { success: false, error: message }
    } finally {
      loading.value = false
    }
  }

  const createProduct = async (payload) => {
    const normalizedPayload = buildConstructeurRequestPayload(payload)
    loading.value = true
    error.value = null
    try {
      const result = await post('/products', normalizedPayload)
      if (result.success && result.data) {
        const enriched = await withResolvedConstructeurs(result.data)
        const added = replaceInCache(enriched)
        if (added) {
          total.value += 1
        }
      } else if (result.error) {
        error.value = result.error
        showError(result.error)
      }
      return result
    } catch (err) {
      console.error('Erreur lors de la création du produit:', err)
      const message = err?.message ?? 'Erreur inconnue'
      error.value = message
      showError(message)
      return { success: false, error: message }
    } finally {
      loading.value = false
    }
  }

  const updateProduct = async (id, payload) => {
    const normalizedPayload = buildConstructeurRequestPayload(payload)
    loading.value = true
    error.value = null
    try {
      const result = await patch(`/products/${id}`, normalizedPayload)
      if (result.success && result.data) {
        const enriched = await withResolvedConstructeurs(result.data)
        replaceInCache(enriched)
      } else if (result.error) {
        error.value = result.error
        showError(result.error)
      }
      return result
    } catch (err) {
      console.error('Erreur lors de la mise à jour du produit:', err)
      const message = err?.message ?? 'Erreur inconnue'
      error.value = message
      showError(message)
      return { success: false, error: message }
    } finally {
      loading.value = false
    }
  }

  const deleteProduct = async (id) => {
    loading.value = true
    error.value = null
    try {
      const result = await del(`/products/${id}`)
      if (result.success) {
        const removed = products.value.find((product) => product.id === id)
        products.value = products.value.filter((product) => product.id !== id)
        total.value = Math.max(0, total.value - 1)
      } else if (result.error) {
        error.value = result.error
        showError(result.error)
      }
      return result
    } catch (err) {
      console.error('Erreur lors de la suppression du produit:', err)
      const message = err?.message ?? 'Erreur inconnue'
      error.value = message
      showError(message)
      return { success: false, error: message }
    } finally {
      loading.value = false
    }
  }

  const getProduct = async (id, options = {}) => {
    const shouldForce = !!options.force
    if (!shouldForce) {
      const cached = products.value.find((product) => product.id === id)
      if (cached && Array.isArray(cached.constructeurs) && cached.constructeurs.length > 0) {
        return { success: true, data: cached }
      }
    }

    try {
      const result = await get(`/products/${id}`)
      if (result.success && result.data) {
        const enriched = await withResolvedConstructeurs(result.data)
        replaceInCache(enriched)
        return { success: true, data: enriched }
      }
      return result
    } catch (err) {
      console.error('Erreur lors du chargement du produit:', err)
      const message = err?.message ?? 'Erreur inconnue'
      return { success: false, error: message }
    }
  }

  const clearProductsCache = () => {
    products.value = []
    total.value = 0
    loaded.value = false
    error.value = null
  }

  return {
    products,
    total,
    loading,
    loaded,
    error,
    loadProducts,
    createProduct,
    updateProduct,
    deleteProduct,
    getProduct,
    clearProductsCache,
  }
}