<template>
  <main class="mx-auto flex w-full max-w-4xl flex-col gap-8 px-4 py-8 sm:px-6 lg:px-8">
    <header class="space-y-2">
      <div class="flex items-center justify-between gap-4">
        <div>
          <h1 class="text-3xl font-bold text-base-content">{{ title }}</h1>
          <p class="text-base text-base-content/70">
            Mettez à jour la structure et les champs personnalisés de cette catégorie de pièce pour préparer les futures créations.
          </p>
        </div>
        <button type="button" class="btn btn-ghost" @click="$router.back()">
          Retour au catalogue
        </button>
      </div>
    </header>

    <section class="rounded-xl border border-base-300 bg-base-100 p-6 shadow-sm">
      <div v-if="loading" class="flex items-center justify-center py-16">
        <span class="loading loading-spinner loading-lg" aria-hidden="true"></span>
        <span class="ml-3 text-sm text-base-content/70">Chargement de la catégorie…</span>
      </div>
      <ModelTypeForm
        v-else
        mode="edit"
        initial-category="PIECE"
        :initial-data="initialData"
        :lock-category="true"
        :saving="saving"
        :readonly="!canEdit"
        @submit="handleSubmit"
        @cancel="handleCancel"
      />
    </section>

    <!-- Comments -->
    <div class="mt-4">
      <CommentSection
        entity-type="piece_category"
        :entity-id="String(route.params.id)"
        :entity-name="initialData?.name"
        show-resolved
      />
    </div>

    <SyncConfirmationModal
      :preview="syncPreviewData"
      :open="showSyncModal"
      :loading="syncLoading"
      @confirm="handleSyncConfirm"
      @cancel="handleSyncCancel"
    />
  </main>
</template>

<script setup lang="ts">
import { computed, onMounted, ref } from 'vue'
import { useHead, useRoute, useRouter } from '#imports'
import ModelTypeForm from '~/components/model-types/ModelTypeForm.vue'
import { getModelType, updateModelType, syncPreview, syncExecute, type ModelTypePayload, type SyncPreviewResult } from '~/services/modelTypes'
import type { PieceModelStructure } from '~/shared/types/inventory'
import { usePieceTypes } from '~/composables/usePieceTypes'
import { useToast } from '~/composables/useToast'

const { canEdit } = usePermissions()
const route = useRoute()
const router = useRouter()
const { showError, showSuccess } = useToast()
const { loadPieceTypes } = usePieceTypes()

const loading = ref(true)
const saving = ref(false)
const initialData = ref<Partial<ModelTypePayload> | null>(null)
const showSyncModal = ref(false)
const syncLoading = ref(false)
const syncPreviewData = ref<SyncPreviewResult | null>(null)
const pendingPayload = ref<Partial<ModelTypePayload> | null>(null)

const title = computed(() =>
  initialData.value?.name ? `Modifier « ${initialData.value.name} »` : 'Modifier une catégorie de pièce',
)

useHead(() => ({
  title: title.value,
}))

const navigateBackToList = async () => {
  await router.push('/piece-category').catch(() => {
    showError("Navigation impossible vers la liste des catégories.")
  })
}

const normalizeError = (error: any) => {
  const message = error?.data?.message || error?.message || 'Une erreur est survenue.'
  return Array.isArray(message) ? message[0] : message
}

const loadCategory = async () => {
  loading.value = true
  try {
    const id = String(route.params.id)
    const response = await getModelType(id)

    if (response.category !== 'PIECE') {
      showError("Cette catégorie n'est pas une pièce.")
      await navigateBackToList()
      return
    }

    initialData.value = {
      name: response.name,
      code: response.code,
      category: response.category,
      notes: response.notes ?? response.description ?? '',
      structure: (response.structure as PieceModelStructure | null) ?? undefined,
      referenceFormula: response.referenceFormula ?? null,
      requiredFieldsForReference: response.requiredFieldsForReference ?? null,
    }

  } catch (error) {
    showError(normalizeError(error))
    await navigateBackToList()
  } finally {
    loading.value = false
  }
}

const handleCancel = () => {
  navigateBackToList()
}

const handleSubmit = async (payload: Parameters<typeof updateModelType>[1]) => {
  if (!canEdit.value) return
  const id = String(route.params.id)
  saving.value = true
  try {
    const enrichedPayload = {
      ...payload,
      description: payload?.notes ?? null,
    }

    // Get sync preview BEFORE saving
    const preview = await syncPreview(id, enrichedPayload.structure || {})

    const hasImpact = preview && (
      Object.values(preview.additions || {}).some(v => v > 0)
      || Object.values(preview.deletions || {}).some(v => v > 0)
      || Object.values(preview.modifications || {}).some(v => v > 0)
    )

    if (hasImpact) {
      // Show modal for confirmation
      pendingPayload.value = enrichedPayload
      syncPreviewData.value = preview
      showSyncModal.value = true
    } else {
      // No impact — save directly + sync
      await updateModelType(id, enrichedPayload)
      await syncExecute(id, { confirmDeletions: false, confirmTypeChanges: false })
      await loadPieceTypes({ force: true })
      await loadCategory()
      showSuccess('Catégorie de pièce mise à jour avec succès.')
    }
  } catch (error) {
    showError(normalizeError(error))
  } finally {
    saving.value = false
  }
}

const handleSyncConfirm = async () => {
  if (!pendingPayload.value) return
  const id = String(route.params.id)

  syncLoading.value = true
  try {
    const hasDeletions = syncPreviewData.value && Object.values(syncPreviewData.value.deletions || {}).some(v => v > 0)
    const hasModifications = syncPreviewData.value && Object.values(syncPreviewData.value.modifications || {}).some(v => v > 0)

    await updateModelType(id, pendingPayload.value)
    await syncExecute(id, {
      confirmDeletions: !!hasDeletions,
      confirmTypeChanges: !!hasModifications,
    })
    await loadPieceTypes({ force: true })
    await loadCategory()
    showSuccess('Catégorie de pièce mise à jour avec succès.')
  } catch (error) {
    showError(normalizeError(error))
  } finally {
    syncLoading.value = false
    showSyncModal.value = false
    pendingPayload.value = null
    syncPreviewData.value = null
  }
}

const handleSyncCancel = () => {
  showSyncModal.value = false
  pendingPayload.value = null
  syncPreviewData.value = null
}

onMounted(() => {
  loadCategory()
})
</script>
