<!--
  FlowTemplatesSection.vue — Library view of Flow Templates for SettingsPage.

  Shows all templates in a filterable table, with quick-actions per row:
    - Click → opens the global FlowEditorDialog in edit mode
    - Duplicate button → creates an inactive copy
    - Activate/Deactivate toggle → inline PUT is_active
    - "Nouveau" CTA → opens the dialog in create mode

  Protects is_system templates from delete (enforced server-side too).

  Perf notes:
    - Single list call on mount, no pagination (expected fleet ≤ 200)
    - Client-side filter on cached list (O(n) per keystroke, debounced)
    - Debounced `q` filter input (250 ms)
    - Activate/Deactivate toggles the cached row optimistically to avoid
      a full reload on success
-->
<template>
  <div class="ft-section">
    <!-- Toolbar -->
    <div class="row items-center q-mb-md q-gutter-sm">
      <q-input v-model="q" dense outlined debounce="250" placeholder="Rechercher un template…"
        style="flex:1;min-width:200px" clearable>
        <template #prepend><q-icon name="search" color="grey-6" /></template>
      </q-input>
      <q-select v-model="categoryFilter" dense outlined emit-value map-options clearable
        :options="CATEGORY_OPTIONS" label="Catégorie" style="min-width:160px" />
      <q-select v-model="appliesToFilter" dense outlined emit-value map-options clearable
        :options="APPLIES_TO_OPTIONS" label="Applique à" style="min-width:200px" />
      <q-toggle v-model="showInactive" label="Inclure inactifs" color="indigo-6" dense />
      <q-space />
      <q-btn unelevated color="indigo-6" icon="add" label="Nouveau" no-caps dense
        @click="onCreate" />
      <q-btn flat dense icon="refresh" @click="reload" :loading="loading">
        <q-tooltip>Rafraîchir</q-tooltip>
      </q-btn>
    </div>

    <!-- Loading -->
    <div v-if="loading && !rows.length" class="flex flex-center q-pa-xl">
      <q-spinner size="32px" color="indigo-6" />
    </div>

    <!-- Error -->
    <q-banner v-else-if="error" class="bg-red-1 text-red-9 q-mb-md">
      <template #avatar><q-icon name="error" color="red-7" /></template>
      {{ error }}
    </q-banner>

    <!-- Empty -->
    <div v-else-if="!filtered.length" class="text-center text-grey-6 q-py-lg">
      <q-icon name="account_tree" size="32px" color="grey-4" />
      <div class="text-caption q-mt-sm">Aucun template trouvé</div>
      <q-btn flat dense color="indigo-6" label="Créer le premier template" no-caps
        class="q-mt-sm" @click="onCreate" />
    </div>

    <!-- Table -->
    <div v-else class="ft-table-wrap">
      <table class="ft-table">
        <thead>
          <tr>
            <th class="text-left" style="width:40px"></th>
            <th class="text-left">Nom</th>
            <th class="text-left" style="width:110px">Catégorie</th>
            <th class="text-left" style="width:150px">Applique à</th>
            <th class="text-left" style="width:170px">Trigger</th>
            <th class="text-center" style="width:80px">Étapes</th>
            <th class="text-center" style="width:70px">Actif</th>
            <th class="text-center" style="width:110px">Actions</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="r in filtered" :key="r.name" class="ft-row"
            @click="onEdit(r)">
            <td><q-icon :name="r.icon || 'account_tree'" :color="r.is_system ? 'amber-8' : 'indigo-6'" /></td>
            <td>
              <div class="text-weight-medium">{{ r.template_name }}</div>
              <div class="text-caption text-grey-6">
                {{ r.name }}
                <q-badge v-if="r.is_system" color="amber-2" text-color="amber-9" label="système" class="q-ml-xs" />
                <span v-if="r.version" class="q-ml-xs">v{{ r.version }}</span>
              </div>
            </td>
            <td><q-badge :color="categoryColor(r.category)" :label="categoryLabel(r.category)" /></td>
            <td class="text-grey-7 text-caption">{{ r.applies_to || '—' }}</td>
            <td class="text-caption text-grey-7">{{ triggerLabel(r.trigger_event) || '—' }}</td>
            <td class="text-center text-caption">{{ r.step_count || 0 }}</td>
            <td class="text-center" @click.stop>
              <q-toggle :model-value="!!r.is_active" color="green-6" dense
                @update:model-value="v => onToggleActive(r, v)" />
            </td>
            <td class="text-center" @click.stop>
              <q-btn flat round dense size="sm" icon="content_copy" color="indigo-6"
                @click="onDuplicate(r)">
                <q-tooltip>Dupliquer</q-tooltip>
              </q-btn>
              <q-btn v-if="!r.is_system" flat round dense size="sm" icon="delete" color="red-5"
                @click="onDelete(r)">
                <q-tooltip>Supprimer</q-tooltip>
              </q-btn>
            </td>
          </tr>
        </tbody>
      </table>
    </div>

    <div class="text-caption text-grey-6 q-mt-sm">
      {{ filtered.length }} template{{ filtered.length > 1 ? 's' : '' }}
      <span v-if="filtered.length !== rows.length"> · filtrés sur {{ rows.length }}</span>
    </div>
  </div>
</template>

<script setup>
import { computed, onMounted, ref } from 'vue'
import { Notify } from 'quasar'
import { useFlowEditor } from 'src/composables/useFlowEditor'
import {
  listFlowTemplates,
  updateFlowTemplate,
  duplicateFlowTemplate,
  deleteFlowTemplate,
} from 'src/api/flow-templates'

// ── Static option sets ──────────────────────────────────────────────────────

const CATEGORY_OPTIONS = [
  { label: 'Résidentiel',   value: 'residential' },
  { label: 'Commercial',    value: 'commercial' },
  { label: 'Dépannage',     value: 'incident' },
  { label: 'Administratif', value: 'admin' },
  { label: 'Agent AI',      value: 'agent' },
  { label: 'Autre',         value: 'other' },
]

const APPLIES_TO_OPTIONS = [
  { label: 'Quotation',        value: 'Quotation' },
  { label: 'Service Contract', value: 'Service Contract' },
  { label: 'Issue',            value: 'Issue' },
  { label: 'Customer',         value: 'Customer' },
  { label: 'Subscription',     value: 'Subscription' },
]

const TRIGGER_EVENT_LABELS = {
  on_contract_signed:     'Contrat signé',
  on_payment_received:    'Paiement reçu',
  on_subscription_active: 'Abonnement actif',
  on_quotation_created:   'Devis créé',
  on_quotation_accepted:  'Devis accepté',
  on_issue_opened:        'Ticket ouvert',
  on_customer_created:    'Client créé',
  on_dispatch_completed:  'Intervention terminée',
  manual:                 'Manuel',
}

const CATEGORY_COLORS = {
  residential: 'blue-1',
  commercial:  'teal-1',
  incident:    'red-1',
  admin:       'grey-3',
  agent:       'purple-1',
  other:       'grey-2',
}

const CATEGORY_LABELS = Object.fromEntries(CATEGORY_OPTIONS.map(o => [o.value, o.label]))

function categoryLabel (c) { return CATEGORY_LABELS[c] || c }
function categoryColor (c) { return CATEGORY_COLORS[c] || 'grey-2' }
function triggerLabel (t)  { return TRIGGER_EVENT_LABELS[t] || t }

// ── Reactive state ──────────────────────────────────────────────────────────

const rows        = ref([])
const loading     = ref(false)
const error       = ref(null)
const q           = ref('')
const categoryFilter = ref(null)
const appliesToFilter = ref(null)
const showInactive = ref(true)

const fe = useFlowEditor()

// ── Data loading ────────────────────────────────────────────────────────────

/**
 * Load templates from the Hub.
 * Called on mount + after each mutation (or via the refresh button).
 */
async function reload () {
  loading.value = true
  error.value = null
  try {
    rows.value = await listFlowTemplates()
  } catch (e) {
    error.value = e.message
  } finally {
    loading.value = false
  }
}

onMounted(reload)

// ── Client-side filtering (single pass, fast for < 500 rows) ────────────────

const filtered = computed(() => {
  const ql = q.value?.trim().toLowerCase()
  const cat = categoryFilter.value
  const ap = appliesToFilter.value
  return rows.value.filter(r => {
    if (!showInactive.value && !r.is_active) return false
    if (cat && r.category !== cat) return false
    if (ap && r.applies_to !== ap) return false
    if (ql) {
      const hay = `${r.template_name} ${r.name} ${r.tags || ''} ${r.description || ''}`.toLowerCase()
      if (!hay.includes(ql)) return false
    }
    return true
  })
})

// ── Row actions ─────────────────────────────────────────────────────────────

function onCreate () {
  fe.openNew({
    category: categoryFilter.value || 'other',
    applies_to: appliesToFilter.value || null,
    onSaved: () => reload(),
  })
}

function onEdit (row) {
  fe.openTemplate(row.name, { onSaved: () => reload() })
}

async function onDuplicate (row) {
  try {
    const dup = await duplicateFlowTemplate(row.name)
    Notify.create({ type: 'positive', message: `Copie créée (${dup.name})`, timeout: 1500 })
    await reload()
    fe.openTemplate(dup.name, { onSaved: () => reload() })
  } catch (e) {
    Notify.create({ type: 'negative', message: 'Erreur: ' + e.message, timeout: 3000 })
  }
}

async function onDelete (row) {
  if (row.is_system) {
    Notify.create({ type: 'warning', message: 'Les templates système ne peuvent pas être supprimés. Utilisez "Dupliquer".', timeout: 3000 })
    return
  }
  if (!window.confirm(`Supprimer "${row.template_name}" ?`)) return
  try {
    await deleteFlowTemplate(row.name)
    rows.value = rows.value.filter(r => r.name !== row.name)
    Notify.create({ type: 'info', message: 'Supprimé', timeout: 1500 })
  } catch (e) {
    Notify.create({ type: 'negative', message: 'Erreur: ' + e.message, timeout: 3000 })
  }
}

/** Optimistic toggle — revert on API failure. */
async function onToggleActive (row, v) {
  const prev = row.is_active
  row.is_active = v ? 1 : 0
  try {
    await updateFlowTemplate(row.name, { is_active: v ? 1 : 0 })
  } catch (e) {
    row.is_active = prev
    Notify.create({ type: 'negative', message: 'Échec: ' + e.message, timeout: 2500 })
  }
}
</script>

<style scoped>
.ft-section { padding: 4px; }

.ft-table-wrap {
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  overflow-x: auto;
  background: #fff;
}

.ft-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.ft-table thead th {
  background: #f8fafc;
  border-bottom: 1px solid #e2e8f0;
  padding: 8px 12px;
  font-weight: 600;
  color: #475569;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.ft-row td {
  padding: 10px 12px;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: middle;
}

.ft-row { cursor: pointer; transition: background 0.12s; }
.ft-row:hover { background: #f8fafc; }
.ft-row:last-child td { border-bottom: none; }
</style>
