<template>
  <DocumentPreviewModal
    :document="previewDocument"
    :visible="previewVisible"
    @close="closePreview"
  />
  <main class="container mx-auto px-6 py-10">
    <div v-if="loading" class="flex flex-col items-center gap-4 py-20 text-center">
      <span class="loading loading-spinner loading-lg" aria-hidden="true" />
      <p class="text-sm text-base-content/70">Chargement de la pièce…</p>
    </div>

    <div v-else-if="!piece" class="max-w-xl mx-auto">
      <div class="alert alert-error shadow-lg">
        <div>
          <h2 class="font-semibold text-lg">Pièce introuvable</h2>
          <p class="text-sm text-base-content/80">
            Nous n'avons pas pu retrouver la pièce demandée. Elle a peut-être été supprimée.
          </p>
        </div>
      </div>
      <NuxtLink to="/pieces-catalog" class="btn btn-primary mt-6">
        Retour au catalogue
      </NuxtLink>
    </div>

    <section v-else class="card border border-base-200 bg-base-100 shadow-sm max-w-5xl mx-auto">
      <div class="card-body space-y-6">
        <header class="flex flex-col gap-2 md:flex-row md:items-center md:justify-between">
          <div>
            <h1 class="text-3xl font-semibold text-base-content">Modifier la pièce</h1>
            <p class="text-sm text-base-content/70">
              Ajustez les informations de la pièce et ses champs personnalisés.
            </p>
          </div>
          <NuxtLink to="/pieces-catalog" class="btn btn-ghost btn-sm md:btn-md self-start">
            Retour au catalogue
          </NuxtLink>
        </header>

        <div class="grid grid-cols-1 gap-4 md:grid-cols-2">
          <div class="form-control">
            <label class="label">
              <span class="label-text">Catégorie de pièce</span>
            </label>
            <select
              v-model="selectedTypeId"
              class="select select-bordered select-sm md:select-md"
              disabled
            >
              <option value="">Sélectionner une catégorie</option>
              <option
                v-for="type in pieceTypeList"
                :key="type.id"
                :value="type.id"
              >
                {{ type.name }}
              </option>
            </select>
            <p class="text-xs text-base-content/60 mt-1">
              La catégorie d'origine ne peut pas être modifiée depuis cette page.
            </p>
          </div>
        </div>

        <div class="grid grid-cols-1 gap-4 md:grid-cols-2">
          <div class="form-control">
            <label class="label">
              <span class="label-text">Nom de la pièce</span>
            </label>
            <input
              v-model="editionForm.name"
              type="text"
              class="input input-bordered input-sm md:input-md"
              :disabled="saving"
              placeholder="Nom affiché dans le catalogue"
              required
            >
          </div>
        </div>

        <div class="grid grid-cols-1 gap-4 md:grid-cols-2">
          <div class="form-control">
            <label class="label">
              <span class="label-text">Référence</span>
            </label>
            <input
              v-model="editionForm.reference"
              type="text"
              class="input input-bordered input-sm md:input-md"
              :disabled="saving"
              placeholder="Référence interne ou fournisseur"
            >
          </div>

          <div class="form-control">
            <label class="label">
              <span class="label-text">Fournisseur</span>
            </label>
            <ConstructeurSelect
              v-model="editionForm.constructeurIds"
              class="w-full"
              :disabled="saving"
              placeholder="Rechercher un ou plusieurs fournisseurs..."
              :initial-options="piece?.constructeurs || []"
            />
          </div>
        </div>

        <div class="grid grid-cols-1 gap-4 md:grid-cols-2">
          <div class="form-control">
            <label class="label">
              <span class="label-text">Prix indicatif (€)</span>
            </label>
            <input
              v-model="editionForm.prix"
              type="number"
              step="0.01"
              min="0"
              class="input input-bordered input-sm md:input-md"
              :disabled="saving"
              placeholder="Valeur indicatrice"
            >
          </div>
        </div>

        <div
          v-if="structureProducts.length"
          class="space-y-3 rounded-lg border border-base-200 bg-base-200/40 p-4"
        >
          <header class="space-y-1">
            <h2 class="font-semibold text-base-content">
              Produit requis par le squelette
            </h2>
            <p class="text-xs text-base-content/70">
              Cette pièce doit rester liée à un produit catalogue répondant aux critères suivants.
            </p>
          </header>
          <ul class="space-y-2 text-sm text-base-content/80">
            <li
              v-for="(description, index) in productRequirementDescriptions"
              :key="`edit-requirement-${index}`"
              class="flex items-start gap-2"
            >
              <span class="mt-0.5 inline-flex h-2 w-2 flex-shrink-0 rounded-full bg-primary"></span>
              <span>{{ description }}</span>
            </li>
          </ul>
          <div class="grid grid-cols-1 gap-3 md:grid-cols-2">
            <div
              v-for="entry in productRequirementEntries"
              :key="entry.key"
              class="form-control"
            >
              <label class="label">
                <span class="label-text text-xs font-medium">
                  {{ entry.label }}
                </span>
              </label>
              <ProductSelect
                :model-value="productSelections[entry.index] || null"
                :disabled="saving"
                :type-product-id="entry.typeProductId"
                helper-text="Un produit valide est requis pour cette pièce."
                @update:model-value="(value) => setProductSelection(entry.index, value)"
              />
            </div>
          </div>
        </div>

        <div v-if="selectedType || resolvedStructure" class="space-y-3 rounded-lg border border-base-200 bg-base-200/40 p-4">
          <div class="flex items-center justify-between gap-4">
            <div>
              <h2 class="font-semibold text-base-content">Squelette sélectionné</h2>
              <p class="text-xs text-base-content/70">
                {{ selectedType?.description || 'Ce squelette définit la structure et les champs personnalisés de la pièce.' }}
              </p>
            </div>
            <span class="badge badge-outline">{{ formatPieceStructurePreview(resolvedStructure) }}</span>
          </div>

          <details v-if="resolvedStructure" class="collapse collapse-arrow bg-base-100">
            <summary class="collapse-title text-sm font-medium">
              Consulter le détail du squelette
            </summary>
            <div class="collapse-content space-y-2 text-sm text-base-content/80">
              <div v-if="getStructureCustomFields(resolvedStructure).length" class="space-y-1">
                <h3 class="font-semibold text-sm text-base-content">Champs personnalisés</h3>
                <ul class="list-disc list-inside space-y-1">
                  <li v-for="field in getStructureCustomFields(resolvedStructure)" :key="field.name">
                    <span class="font-medium">{{ field.name }}</span>
                    <span v-if="field.value !== undefined && field.value !== null"> : {{ field.value }}</span>
                  </li>
                </ul>
              </div>

              <p v-else class="text-xs text-base-content/70">
                Ce squelette ne définit pas encore de champs personnalisés.
              </p>
            </div>
          </details>
        </div>

        <div v-if="customFieldInputs.length" class="space-y-4 rounded-lg border border-base-200 bg-base-200/40 p-4">
          <header class="space-y-1">
            <h2 class="font-semibold text-base-content">Champs personnalisés</h2>
            <p class="text-xs text-base-content/70">
              Mettez à jour les valeurs propres à cette pièce.
            </p>
          </header>
          <div class="grid grid-cols-1 gap-4 md:grid-cols-2">
            <div
              v-for="(field, index) in customFieldInputs"
              :key="fieldKey(field, index)"
              class="form-control"
            >
              <label class="label">
                <span class="label-text">{{ field.name }}</span>
                <span v-if="field.required" class="label-text-alt text-error">*</span>
              </label>
              <input
                v-if="field.type === 'text'"
                v-model="field.value"
                type="text"
                class="input input-bordered input-sm md:input-md"
                :required="field.required"
                :disabled="saving"
              >
              <input
                v-else-if="field.type === 'number'"
                v-model="field.value"
                type="number"
                step="0.01"
                class="input input-bordered input-sm md:input-md"
                :required="field.required"
                :disabled="saving"
              >
              <select
                v-else-if="field.type === 'select'"
                v-model="field.value"
                class="select select-bordered select-sm md:select-md"
                :required="field.required"
                :disabled="saving"
              >
                <option value="">Sélectionner...</option>
                <option
                  v-for="option in field.options"
                  :key="option"
                  :value="option"
                >
                  {{ option }}
                </option>
              </select>
              <div v-else-if="field.type === 'boolean'" class="flex items-center gap-2">
                <input
                  v-model="field.value"
                  type="checkbox"
                  class="checkbox checkbox-sm"
                  true-value="true"
                  false-value="false"
                  :disabled="saving"
                >
                <span class="text-sm">{{ field.value === 'true' ? 'Oui' : 'Non' }}</span>
              </div>
              <input
                v-else-if="field.type === 'date'"
                v-model="field.value"
                type="date"
                class="input input-bordered input-sm md:input-md"
                :required="field.required"
                :disabled="saving"
              >
              <input
                v-else
                v-model="field.value"
                type="text"
                class="input input-bordered input-sm md:input-md"
                :required="field.required"
                :disabled="saving"
              >
            </div>
          </div>
        </div>

        <div class="space-y-4 rounded-lg border border-base-200 bg-base-200/40 p-4">
          <header class="flex flex-col gap-1 md:flex-row md:items-center md:justify-between">
            <div>
              <h2 class="font-semibold text-base-content">Documents</h2>
              <p class="text-xs text-base-content/70">
                Gérez les documents associés à cette pièce.
              </p>
            </div>
            <span v-if="selectedFiles.length" class="badge badge-outline">
              {{ selectedFiles.length }} document{{ selectedFiles.length > 1 ? 's' : '' }} prêt{{ selectedFiles.length > 1 ? 's' : '' }} à être ajouté{{ selectedFiles.length > 1 ? 's' : '' }}
            </span>
          </header>
          <div :class="{ 'pointer-events-none opacity-60': saving || uploadingDocuments }">
            <DocumentUpload
              v-model="selectedFiles"
              title="Déposer vos fichiers"
              subtitle="Formats acceptés : PDF, images, documents…"
              @files-added="handleFilesAdded"
            />
          </div>
          <p v-if="uploadingDocuments" class="text-xs text-base-content/70">
            Téléversement des documents en cours…
          </p>
          <p v-else-if="loadingDocuments" class="text-xs text-base-content/70">
            Chargement des documents en cours…
          </p>
          <div v-else-if="pieceDocuments.length" class="space-y-2">
            <div
              v-for="document in pieceDocuments"
              :key="document.id || document.path || document.name"
              class="flex items-center justify-between rounded border border-base-200 bg-base-100 px-3 py-2"
            >
              <div class="flex items-center gap-3 text-sm">
                <div
                  class="flex-shrink-0 overflow-hidden rounded-md border border-base-200 bg-base-200/70 flex items-center justify-center"
                  :class="documentThumbnailClass(document)"
                >
                  <img
                    v-if="isImageDocument(document) && document.path"
                    :src="document.path"
                    class="h-full w-full object-cover"
                    :alt="`Aperçu de ${document.name}`"
                  >
                  <iframe
                    v-else-if="shouldInlinePdf(document)"
                    :src="documentPreviewSrc(document)"
                    class="h-full w-full border-0 bg-white"
                    title="Aperçu PDF"
                  />
                  <component
                    v-else
                    :is="documentIcon(document).component"
                    class="h-6 w-6"
                    :class="documentIcon(document).colorClass"
                    aria-hidden="true"
                  />
                </div>
                <div>
                  <div class="font-medium">
                    {{ document.name }}
                  </div>
                  <div class="text-xs text-base-content/70">
                    {{ document.mimeType || 'Inconnu' }} • {{ formatSize(document.size) }}
                  </div>
                </div>
              </div>
              <div class="flex items-center gap-2">
                <button
                  type="button"
                  class="btn btn-ghost btn-xs"
                  :disabled="!canPreviewDocument(document)"
                  :title="canPreviewDocument(document) ? 'Consulter le document' : 'Aucun aperçu disponible pour ce type'"
                  @click="openPreview(document)"
                >
                  Consulter
                </button>
                <button
                  type="button"
                  class="btn btn-ghost btn-xs"
                  @click="downloadDocument(document)"
                >
                  Télécharger
                </button>
                <button
                  type="button"
                  class="btn btn-error btn-xs"
                  :disabled="uploadingDocuments"
                  @click="removeDocument(document.id)"
                >
                  Supprimer
                </button>
              </div>
            </div>
          </div>
          <p v-else class="text-xs text-base-content/70">
            Aucun document n'est associé à cette pièce pour le moment.
          </p>
        </div>

        <section class="space-y-3 rounded-lg border border-base-200 bg-base-200/40 p-4">
          <header class="flex items-center justify-between gap-3">
            <div>
              <h2 class="font-semibold text-base-content">Historique</h2>
              <p class="text-xs text-base-content/70">
                Qui a changé quoi, et quand.
              </p>
            </div>
            <span v-if="historyEntries.length" class="badge badge-outline">
              {{ historyEntries.length }} entrée{{ historyEntries.length > 1 ? 's' : '' }}
            </span>
          </header>

          <div v-if="historyLoading" class="flex items-center gap-2 text-sm text-base-content/70">
            <span class="loading loading-spinner loading-sm" aria-hidden="true" />
            Chargement de l’historique…
          </div>

          <div v-else-if="historyError" class="alert alert-warning">
            <span>{{ historyError }}</span>
          </div>

          <p v-else-if="historyEntries.length === 0" class="text-xs text-base-content/70">
            Aucun changement enregistré pour le moment.
          </p>

          <ul v-else class="max-h-80 space-y-2 overflow-y-auto pr-1">
            <li
              v-for="entry in historyEntries"
              :key="entry.id"
              class="rounded-md border border-base-200 bg-base-100 px-3 py-2"
            >
              <div class="flex flex-wrap items-center justify-between gap-2 text-xs text-base-content/70">
                <span class="font-medium text-base-content">
                  {{ historyActionLabel(entry.action) }}
                </span>
                <span>{{ formatHistoryDate(entry.createdAt) }}</span>
              </div>
              <p class="mt-1 text-xs text-base-content/60">
                Par {{ entry.actor?.label || 'Inconnu' }}
              </p>

              <ul
                v-if="historyDiffEntries(entry).length"
                class="mt-2 space-y-1 text-xs"
              >
                <li
                  v-for="diffEntry in historyDiffEntries(entry)"
                  :key="`${entry.id}-${diffEntry.field}`"
                  class="flex flex-col gap-0.5"
                >
                  <span class="font-medium text-base-content/80">{{ diffEntry.label }}</span>
                  <span class="text-base-content/60">
                    {{ diffEntry.fromLabel }} → {{ diffEntry.toLabel }}
                  </span>
                </li>
              </ul>

              <p
                v-else-if="entry.snapshot?.name"
                class="mt-2 text-xs text-base-content/70"
              >
                {{ entry.snapshot.name }}
              </p>
            </li>
          </ul>
        </section>

        <div class="flex flex-col gap-3 md:flex-row md:justify-end">
          <NuxtLink to="/pieces-catalog" class="btn btn-ghost" :class="{ 'btn-disabled': saving }">
            Annuler
          </NuxtLink>
          <button type="button" class="btn btn-primary" :disabled="!canSubmit" @click="submitEdition">
            <span v-if="saving" class="loading loading-spinner loading-sm mr-2" />
            Enregistrer les modifications
          </button>
        </div>
      </div>
    </section>
  </main>
</template>

<script setup lang="ts">
import { computed, onMounted, reactive, ref, watch } from 'vue'
import { useRoute, useRouter } from '#imports'
import ConstructeurSelect from '~/components/ConstructeurSelect.vue'
import DocumentUpload from '~/components/DocumentUpload.vue'
import DocumentPreviewModal from '~/components/DocumentPreviewModal.vue'
import ProductSelect from '~/components/ProductSelect.vue'
import { usePieceTypes } from '~/composables/usePieceTypes'
import { usePieces } from '~/composables/usePieces'
import { useCustomFields } from '~/composables/useCustomFields'
import { useApi } from '~/composables/useApi'
import { useToast } from '~/composables/useToast'
import { useDocuments } from '~/composables/useDocuments'
import { useConstructeurs } from '~/composables/useConstructeurs'
import { usePieceHistory, type PieceHistoryEntry } from '~/composables/usePieceHistory'
import { extractRelationId } from '~/shared/apiRelations'
import { canPreviewDocument } from '~/utils/documentPreview'
import { formatPieceStructurePreview } from '~/shared/modelUtils'
import { uniqueConstructeurIds } from '~/shared/constructeurUtils'
import type { PieceModelProduct, PieceModelStructure } from '~/shared/types/inventory'
import type { ModelType } from '~/services/modelTypes'
import { getModelType } from '~/services/modelTypes'
import {
  type CustomFieldInput,
  fieldKey,
  buildCustomFieldInputs,
  requiredCustomFieldsFilled as _requiredCustomFieldsFilled,
  saveCustomFieldValues as _saveCustomFieldValues,
} from '~/shared/utils/customFieldFormUtils'
import {
  documentIcon,
  formatSize,
  shouldInlinePdf,
  documentPreviewSrc,
  documentThumbnailClass,
  downloadDocument,
} from '~/shared/utils/documentDisplayUtils'
import {
  historyActionLabel,
  formatHistoryDate,
  historyDiffEntries as _historyDiffEntries,
} from '~/shared/utils/historyDisplayUtils'

interface PieceCatalogType extends ModelType {
  structure: PieceModelStructure | null
  customFields?: Array<Record<string, any>>
}

const route = useRoute()
const router = useRouter()
const { get } = useApi()
const { pieceTypes, loadPieceTypes } = usePieceTypes()
const { updatePiece } = usePieces()
const { upsertCustomFieldValue, updateCustomFieldValue } = useCustomFields()
const toast = useToast()
const { loadDocumentsByPiece, uploadDocuments, deleteDocument } = useDocuments()
const { ensureConstructeurs } = useConstructeurs()
const {
  history,
  loading: historyLoading,
  error: historyError,
  loadHistory,
} = usePieceHistory()

const piece = ref<any | null>(null)
const loading = ref(true)
const saving = ref(false)
const selectedFiles = ref<File[]>([])
const uploadingDocuments = ref(false)
const loadingDocuments = ref(false)
const pieceDocuments = ref<any[]>([])
const previewDocument = ref<any | null>(null)
const previewVisible = ref(false)

const historyEntries = computed<PieceHistoryEntry[]>(() => history.value)

const historyFieldLabels: Record<string, string> = {
  name: 'Nom',
  reference: 'Référence',
  prix: 'Prix',
  typePiece: 'Catégorie',
  product: 'Produit lié',
  productIds: 'Produits liés',
  constructeurIds: 'Fournisseurs',
}

const historyDiffEntries = (entry: PieceHistoryEntry) =>
  _historyDiffEntries(entry, historyFieldLabels)

const selectedTypeId = ref<string>('')
const pieceTypeDetails = ref<any | null>(null)
const editionForm = reactive({
  name: '' as string,
  reference: '' as string,
  constructeurIds: [] as string[],
  prix: '' as string,
})
const productSelections = ref<(string | null)[]>([])

const customFieldInputs = ref<CustomFieldInput[]>([])
const resolvedStructure = computed<PieceModelStructure | null>(() =>
  pieceTypeDetails.value?.structure ?? selectedType.value?.structure ?? null,
)

const refreshCustomFieldInputs = (
  structureOverride?: PieceModelStructure | null,
  valuesOverride?: any[] | null,
) => {
  const structure = structureOverride ?? resolvedStructure.value ?? null
  const values = valuesOverride ?? piece.value?.customFieldValues ?? null
  customFieldInputs.value = buildCustomFieldInputs(structure, values)
}
const openPreview = (doc: any) => {
  if (!doc || !canPreviewDocument(doc)) {
    return
  }
  previewDocument.value = doc
  previewVisible.value = true
}
const closePreview = () => {
  previewVisible.value = false
  previewDocument.value = null
}
const removeDocument = async (documentId: string | number | null | undefined) => {
  if (!documentId) {
    return
  }
  const result = await deleteDocument(documentId, { updateStore: false })
  if (result.success) {
    pieceDocuments.value = pieceDocuments.value.filter((doc) => doc.id !== documentId)
  }
}
const handleFilesAdded = async (files: File[]) => {
  if (!files?.length || !piece.value?.id) {
    return
  }
  uploadingDocuments.value = true
  try {
    const result = await uploadDocuments(
      {
        files,
        context: { pieceId: piece.value.id },
      },
      { updateStore: false },
    )
    if (result.success) {
      selectedFiles.value = []
      await refreshDocuments()
    }
  } finally {
    uploadingDocuments.value = false
  }
}
const refreshDocuments = async () => {
  if (!piece.value?.id) {
    pieceDocuments.value = []
    return
  }
  loadingDocuments.value = true
  try {
    const result = await loadDocumentsByPiece(piece.value.id, { updateStore: false })
    if (result.success) {
      pieceDocuments.value = Array.isArray(result.data) ? result.data : result.data ? [result.data] : []
    }
  } finally {
    loadingDocuments.value = false
  }
}

const pieceTypeList = computed<PieceCatalogType[]>(() => (pieceTypes.value || []) as PieceCatalogType[])

const selectedType = computed(() => {
  if (!selectedTypeId.value) {
    return null
  }
  return pieceTypeList.value.find((type) => type.id === selectedTypeId.value) ?? null
})

const getStructureProducts = (structure: PieceModelStructure | null) =>
  Array.isArray(structure?.products) ? structure.products : []

const getStructureCustomFields = (structure: PieceModelStructure | null) =>
  Array.isArray(structure?.customFields) ? structure.customFields : []

const structureProducts = computed(() =>
  getStructureProducts(resolvedStructure.value),
)

const requiresProductSelection = computed(() => structureProducts.value.length > 0)

const describeProductRequirement = (requirement: PieceModelProduct, index: number) => {
  if (!requirement) {
    return `Produit ${index + 1}`
  }
  const parts: string[] = []
  if (requirement.role) {
    parts.push(requirement.role)
  }
  if (requirement.typeProductLabel) {
    parts.push(requirement.typeProductLabel)
  } else if (requirement.typeProductId) {
    parts.push(`Catégorie #${requirement.typeProductId}`)
  }
  if (requirement.familyCode) {
    parts.push(`Famille ${requirement.familyCode}`)
  }
  if (parts.length === 0) {
    parts.push(`Produit ${index + 1}`)
  }
  return parts.join(' • ')
}

const productRequirementDescriptions = computed(() =>
  structureProducts.value.map((requirement, index) =>
    describeProductRequirement(requirement, index),
  ),
)

const ensureProductSelections = (count: number) => {
  const next = Array.from({ length: count }, (_, index) => productSelections.value[index] ?? null)
  productSelections.value = next
}

let pendingProductIds: string[] = []

const productRequirementEntries = computed(() =>
  structureProducts.value.map((requirement, index) => ({
    index,
    key: `piece-product-requirement-${index}-${requirement?.typeProductId || 'any'}`,
    label: describeProductRequirement(requirement, index),
    typeProductId: requirement?.typeProductId ? String(requirement.typeProductId) : null,
  })),
)

const productSelectionsFilled = computed(() =>
  !requiresProductSelection.value ||
  productRequirementEntries.value.every((entry) => {
    const value = productSelections.value[entry.index]
    return typeof value === 'string' && value.trim().length > 0
  }),
)

const setProductSelection = (index: number, value: string | null) => {
  const normalized = typeof value === 'string' ? value : null
  const next = [...productSelections.value]
  next[index] = normalized
  productSelections.value = next
}

watch(structureProducts, (products) => {
  ensureProductSelections(products.length)
  if (!pendingProductIds.length || products.length === 0) {
    return
  }
  const next = Array.from(
    { length: products.length },
    (_, index) => pendingProductIds[index] ?? null,
  )
  productSelections.value = next
  pendingProductIds = []
})

const requiredCustomFieldsFilled = computed(() =>
  _requiredCustomFieldsFilled(customFieldInputs.value),
)

const canSubmit = computed(() =>
  Boolean(
    piece.value &&
    editionForm.name &&
    requiredCustomFieldsFilled.value &&
    productSelectionsFilled.value &&
    !saving.value,
  ),
)

const fetchPiece = async () => {
  const id = route.params.id
  if (!id || typeof id !== 'string') {
    piece.value = null
    pieceDocuments.value = []
    return
  }
  const result = await get(`/pieces/${id}`)
  if (result.success) {
    piece.value = result.data
    pieceDocuments.value = Array.isArray(result.data?.documents) ? result.data.documents : []

    // Use customFieldValues from entity response (enriched with customField definitions via serialization groups)
    const customValues = Array.isArray(result.data?.customFieldValues) ? result.data.customFieldValues : []
    refreshCustomFieldInputs(undefined, customValues)

    // Use cached type from loadPieceTypes() instead of separate getModelType() call
    loadPieceTypeDetailsFromCache(result.data)

    // History is non-blocking — template handles its own loading state
    loadHistory(result.data.id).catch(() => {})
  } else {
    piece.value = null
    pieceDocuments.value = []
  }
}

const loadPieceTypeDetailsFromCache = (currentPiece: any) => {
  const typeId = currentPiece?.typePieceId
    || extractRelationId(currentPiece?.typePiece)
    || ''
  if (!typeId) {
    pieceTypeDetails.value = null
    return
  }
  // Look up in the already-loaded pieceTypes cache (from loadPieceTypes in onMounted)
  const cachedType = (pieceTypes.value || []).find((t: any) => t.id === typeId) ?? null
  if (cachedType) {
    pieceTypeDetails.value = cachedType
    refreshCustomFieldInputs((cachedType.structure as PieceModelStructure | null) ?? null, currentPiece?.customFieldValues ?? null)
    return
  }
  // Fallback: fetch if not in cache (edge case)
  getModelType(typeId).then((type) => {
    if (type && typeof type === 'object') {
      pieceTypeDetails.value = type
      refreshCustomFieldInputs((type.structure as PieceModelStructure | null) ?? null, currentPiece?.customFieldValues ?? null)
    }
  }).catch(() => {
    pieceTypeDetails.value = null
  })
}

let initialized = false

watch(
  [piece, selectedType],
  ([currentPiece, currentType]) => {
    if (!currentPiece || initialized) {
      return
    }

    const resolvedTypeId = currentPiece.typePieceId
      || extractRelationId(currentPiece.typePiece)
      || ''
    if (resolvedTypeId && !currentPiece.typePieceId) {
      currentPiece.typePieceId = resolvedTypeId
    }
    selectedTypeId.value = resolvedTypeId

    editionForm.name = currentPiece.name || ''
    editionForm.reference = currentPiece.reference || ''
    editionForm.constructeurIds = uniqueConstructeurIds(
      currentPiece,
      Array.isArray(currentPiece.constructeurs) ? currentPiece.constructeurs : [],
      currentPiece.constructeur ? [currentPiece.constructeur] : [],
    )
    editionForm.prix = currentPiece.prix !== null && currentPiece.prix !== undefined ? String(currentPiece.prix) : ''
    if (editionForm.constructeurIds.length) {
      void ensureConstructeurs(editionForm.constructeurIds)
    }

    const existingProductIds = Array.isArray(currentPiece.productIds) && currentPiece.productIds.length
      ? currentPiece.productIds.map((id: unknown) => String(id))
      : currentPiece.product?.id || currentPiece.productId
        ? [String(currentPiece.product?.id || currentPiece.productId)]
        : []
    pendingProductIds = existingProductIds
    ensureProductSelections(structureProducts.value.length)
    if (existingProductIds.length && structureProducts.value.length) {
      const next = Array.from(
        { length: structureProducts.value.length },
        (_, index) => existingProductIds[index] ?? null,
      )
      productSelections.value = next
      pendingProductIds = []
    }

    refreshCustomFieldInputs(currentType?.structure ?? null, currentPiece.customFieldValues)

    initialized = true
  },
  { immediate: true },
)

watch(selectedType, (currentType) => {
  if (!piece.value || !currentType) {
    return
  }
  if (!pieceTypeDetails.value) {
    refreshCustomFieldInputs(currentType.structure, piece.value.customFieldValues)
  }
})

watch(resolvedStructure, (currentStructure) => {
  if (!piece.value) {
    return
  }
  ensureProductSelections(structureProducts.value.length)
  refreshCustomFieldInputs(currentStructure, piece.value.customFieldValues)
})

const submitEdition = async () => {
  if (!piece.value) {
    return
  }

  if (!productSelectionsFilled.value) {
    toast.showError('Sélectionnez un produit conforme au squelette.')
    return
  }

  const rawPrice = typeof editionForm.prix === 'string'
    ? editionForm.prix.trim()
    : editionForm.prix === null || editionForm.prix === undefined
      ? ''
      : String(editionForm.prix).trim()

  const constructeurIds = uniqueConstructeurIds(editionForm.constructeurIds)

  const payload: Record<string, any> = {
    name: editionForm.name.trim(),
    constructeurIds,
  }

  const reference = editionForm.reference.trim()
  payload.reference = reference ? reference : null

  const normalizedProductIds = productRequirementEntries.value
    .map((entry) => productSelections.value[entry.index])
    .filter((value): value is string => typeof value === 'string' && value.trim().length > 0)
    .map((value) => value.trim())

  payload.productIds = normalizedProductIds
  payload.productId = normalizedProductIds[0] || null

  if (rawPrice) {
    const parsed = Number(rawPrice)
    if (!Number.isNaN(parsed)) {
      payload.prix = String(parsed)
    }
  } else {
    payload.prix = null
  }

  saving.value = true
  try {
    const result = await updatePiece(piece.value.id, payload)
    if (result.success && result.data) {
      const updatedPiece = result.data as Record<string, any>
      await _saveCustomFieldValues(
        'piece',
        updatedPiece.id,
        [
          updatedPiece?.typePiece?.pieceCustomFields,
          updatedPiece?.typeMachinePieceRequirement?.typePiece?.pieceCustomFields,
        ],
        { customFieldInputs, upsertCustomFieldValue, updateCustomFieldValue, toast },
      )
      await router.push('/pieces-catalog')
    }
  } catch (error: any) {
    toast.showError(error?.message || 'Erreur lors de la mise à jour de la pièce')
  } finally {
    saving.value = false
  }
}

onMounted(async () => {
  await Promise.allSettled([loadPieceTypes(), fetchPiece()])
  loading.value = false
})
</script>
