<template>
  <dialog ref="dialogRef" class="modal" :class="{ 'modal-open': visible }">
    <div class="modal-box max-w-lg">
      <h3 class="text-lg font-bold">Restaurer la version {{ preview?.version }}</h3>

      <div v-if="!preview" class="flex justify-center py-8">
        <span class="loading loading-spinner loading-md" />
      </div>

      <template v-else>
        <div class="mt-4 space-y-4">
          <!-- Restore mode explanation -->
          <div
            class="alert text-sm"
            :class="preview.restoreMode === 'full' ? 'alert-info' : 'alert-warning'"
          >
            <div class="flex flex-col gap-1">
              <!-- FULL MODE -->
              <template v-if="preview.restoreMode === 'full'">
                <span class="font-semibold">Restauration complete</span>

                <!-- Machine: always full, no category -->
                <template v-if="entityType === 'machine'">
                  <span>Tous les elements de la machine seront restaures :</span>
                  <ul class="ml-4 list-disc text-xs">
                    <li>Nom, reference, prix</li>
                    <li>Site</li>
                    <li>Fournisseurs</li>
                    <li>Champs personnalises</li>
                  </ul>
                </template>

                <!-- Composant -->
                <template v-else-if="entityType === 'composant'">
                  <span>La categorie est identique. Tous les elements du composant seront restaures :</span>
                  <ul class="ml-4 list-disc text-xs">
                    <li>Nom, reference, description, prix</li>
                    <li>Fournisseurs</li>
                    <li>Structure : pieces, sous-composants et produits lies</li>
                    <li>Champs personnalises</li>
                  </ul>
                </template>

                <!-- Piece -->
                <template v-else-if="entityType === 'piece'">
                  <span>La categorie est identique. Tous les elements de la piece seront restaures :</span>
                  <ul class="ml-4 list-disc text-xs">
                    <li>Nom, reference, description, prix</li>
                    <li>Fournisseurs</li>
                    <li>Produits lies</li>
                    <li>Champs personnalises</li>
                  </ul>
                </template>

                <!-- Product -->
                <template v-else-if="entityType === 'product'">
                  <span>La categorie est identique. Tous les elements du produit seront restaures :</span>
                  <ul class="ml-4 list-disc text-xs">
                    <li>Nom, reference, prix fournisseur</li>
                    <li>Fournisseurs</li>
                    <li>Champs personnalises</li>
                  </ul>
                </template>
              </template>

              <!-- PARTIAL MODE (never for machines) -->
              <template v-else>
                <span class="font-semibold">Restauration partielle</span>

                <!-- Composant -->
                <template v-if="entityType === 'composant'">
                  <span>La categorie du composant a change depuis cette version. Seuls les champs de base seront restaures :</span>
                  <ul class="ml-4 list-disc text-xs">
                    <li>Nom, reference, description, prix</li>
                    <li>Fournisseurs</li>
                  </ul>
                  <span class="mt-1 text-xs font-medium">Ne seront PAS modifies :</span>
                  <ul class="ml-4 list-disc text-xs opacity-70">
                    <li>Structure actuelle (pieces, sous-composants, produits lies)</li>
                    <li>Champs personnalises actuels</li>
                  </ul>
                </template>

                <!-- Piece -->
                <template v-else-if="entityType === 'piece'">
                  <span>La categorie de la piece a change depuis cette version. Seuls les champs de base seront restaures :</span>
                  <ul class="ml-4 list-disc text-xs">
                    <li>Nom, reference, description, prix</li>
                    <li>Fournisseurs</li>
                  </ul>
                  <span class="mt-1 text-xs font-medium">Ne seront PAS modifies :</span>
                  <ul class="ml-4 list-disc text-xs opacity-70">
                    <li>Produits lies actuels</li>
                    <li>Champs personnalises actuels</li>
                  </ul>
                </template>

                <!-- Product -->
                <template v-else-if="entityType === 'product'">
                  <span>La categorie du produit a change depuis cette version. Seuls les champs de base seront restaures :</span>
                  <ul class="ml-4 list-disc text-xs">
                    <li>Nom, reference, prix fournisseur</li>
                    <li>Fournisseurs</li>
                  </ul>
                  <span class="mt-1 text-xs font-medium">Ne seront PAS modifies :</span>
                  <ul class="ml-4 list-disc text-xs opacity-70">
                    <li>Champs personnalises actuels</li>
                  </ul>
                </template>
              </template>
            </div>
          </div>

          <!-- Diff -->
          <div v-if="Object.keys(preview.diff).length" class="space-y-2">
            <h4 class="text-sm font-semibold">Changements qui seront appliques</h4>
            <ul class="space-y-1 text-sm">
              <li
                v-for="(change, field) in preview.diff"
                :key="field"
                class="flex flex-col rounded-md border border-base-200 px-3 py-2"
              >
                <span class="font-medium text-base-content">{{ fieldLabels[field] || formatFieldLabel(String(field)) }}</span>
                <span class="text-xs text-error line-through">{{ formatValue(change.current) }}</span>
                <span class="text-xs text-success">{{ formatValue(change.restored) }}</span>
              </li>
            </ul>
          </div>

          <div v-else class="text-sm text-base-content/60">
            Aucune difference detectee — l'entite est deja dans l'etat de cette version.
          </div>

          <!-- Warnings -->
          <div v-if="preview.warnings.length" class="space-y-1">
            <h4 class="text-sm font-semibold text-warning">Avertissements</h4>
            <ul class="space-y-1">
              <li
                v-for="(warning, i) in preview.warnings"
                :key="i"
                class="alert alert-warning py-2 text-xs"
              >
                {{ warning.message }}
              </li>
            </ul>
          </div>
        </div>

        <div class="modal-action">
          <button class="btn btn-ghost btn-sm md:btn-md" :disabled="restoring" @click="$emit('close')">
            Annuler
          </button>
          <button class="btn btn-primary btn-sm md:btn-md" :disabled="restoring" @click="$emit('confirm')">
            <span v-if="restoring" class="loading loading-spinner loading-sm mr-2" />
            Confirmer la restauration
          </button>
        </div>
      </template>
    </div>
    <form method="dialog" class="modal-backdrop" @click="$emit('close')">
      <button type="button">close</button>
    </form>
  </dialog>
</template>

<script setup lang="ts">
import type { RestorePreview } from '~/composables/useEntityVersions'

defineProps<{
  visible: boolean
  preview: RestorePreview | null
  restoring: boolean
  fieldLabels: Record<string, string>
  entityType: 'machine' | 'composant' | 'piece' | 'product'
}>()

defineEmits<{
  close: []
  confirm: []
}>()

const formatFieldLabel = (field: string): string => {
  if (field.startsWith('customField:')) {
    return `Champ perso : ${field.replace('customField:', '')}`
  }
  return field
}

const formatValue = (value: unknown): string => {
  if (value === null || value === undefined) return '—'
  if (Array.isArray(value)) {
    return value.map((v) => (typeof v === 'object' && v !== null ? (v as any).name || (v as any).id || JSON.stringify(v) : String(v))).join(', ') || '—'
  }
  if (typeof value === 'object') return JSON.stringify(value)
  return String(value)
}
</script>
