<template>
  <q-page padding>
    <div class="row items-center q-mb-md">
      <q-icon name="document_scanner" size="28px" class="q-mr-sm" color="primary" />
      <div class="text-h6">Scanner une facture</div>
      <q-space />
      <q-badge v-if="ollamaStatus" :color="ollamaStatus.online ? 'green' : 'red'"
        :label="ollamaStatus.online ? 'Gemini en ligne' : 'Vision hors ligne'" />
    </div>

    <!-- Upload / Camera -->
    <q-card class="q-mb-md" v-if="!result">
      <q-card-section>
        <div class="text-center q-gutter-md">
          <q-btn color="primary" icon="photo_camera" label="Prendre une photo" size="lg" @click="$refs.camera.click()" />
          <q-btn color="secondary" icon="upload_file" label="Importer un fichier" size="lg" @click="$refs.fileInput.click()" />
        </div>
        <input ref="camera" type="file" accept="image/*" capture="environment" class="hidden" @change="onFile" />
        <input ref="fileInput" type="file" accept="image/*,.pdf" class="hidden" @change="onFile" />
      </q-card-section>

      <!-- Preview -->
      <q-card-section v-if="preview" class="text-center">
        <img :src="preview" style="max-width:100%;max-height:400px;border-radius:8px" />
        <div class="q-mt-md">
          <q-btn color="primary" icon="document_scanner" label="Analyser avec Gemini Vision" :loading="processing" @click="runOcr" size="lg" />
        </div>
        <q-linear-progress v-if="processing" indeterminate color="primary" class="q-mt-sm" />
        <div v-if="processing" class="text-caption text-grey q-mt-xs">Analyse en cours... (habituellement 2-5s)</div>
      </q-card-section>
    </q-card>

    <!-- Error -->
    <q-banner v-if="error" type="negative" class="q-mb-md text-negative" rounded>
      <template v-slot:avatar><q-icon name="error" color="negative" /></template>
      {{ error }}
      <template v-slot:action>
        <q-btn flat label="Réessayer" @click="error = null" />
      </template>
    </q-banner>

    <!-- Results -->
    <template v-if="result">
      <q-card class="q-mb-md">
        <q-card-section>
          <div class="row items-center q-mb-sm">
            <q-icon name="check_circle" color="positive" size="24px" class="q-mr-sm" />
            <div class="text-subtitle1 text-weight-bold">Résultat OCR</div>
            <q-space />
            <q-btn flat dense icon="restart_alt" label="Nouvelle" @click="reset" />
          </div>

          <!-- Side by side: image + data -->
          <div class="row q-gutter-md">
            <div class="col-12 col-md-5">
              <img :src="preview" style="width:100%;border-radius:8px" />
            </div>
            <div class="col">
              <div class="ocr-grid">
                <div class="ocr-field">
                  <label>Fournisseur</label>
                  <q-input v-model="result.vendor" dense outlined />
                </div>
                <div class="ocr-field">
                  <label>No facture</label>
                  <q-input v-model="result.invoice_number" dense outlined />
                </div>
                <div class="ocr-field">
                  <label>Date</label>
                  <q-input v-model="result.date" dense outlined type="date" />
                </div>
                <div class="ocr-field">
                  <label>Échéance</label>
                  <q-input v-model="result.due_date" dense outlined type="date" />
                </div>
                <div class="ocr-field">
                  <label>Sous-total</label>
                  <q-input v-model.number="result.subtotal" dense outlined type="number" prefix="$" />
                </div>
                <div class="ocr-field">
                  <label>TPS (5%)</label>
                  <q-input v-model.number="result.tax_gst" dense outlined type="number" prefix="$" />
                </div>
                <div class="ocr-field">
                  <label>TVQ (9.975%)</label>
                  <q-input v-model.number="result.tax_qst" dense outlined type="number" prefix="$" />
                </div>
                <div class="ocr-field">
                  <label>Total</label>
                  <q-input v-model.number="result.total" dense outlined type="number" prefix="$" class="text-weight-bold" />
                </div>
              </div>

              <!-- Line items -->
              <div v-if="result.items?.length" class="q-mt-md">
                <div class="text-caption text-weight-bold text-grey-7 q-mb-xs">ARTICLES</div>
                <DataTable :rows="result.items" :columns="itemCols" row-key="description" flat dense hide-pagination
                  :pagination="{ rowsPerPage: 0 }" class="ops-table">
                  <template #body-cell-rate="p">
                    <q-td :props="p" class="text-right">{{ formatMoney(p.row.rate) }}</q-td>
                  </template>
                  <template #body-cell-amount="p">
                    <q-td :props="p" class="text-right">{{ formatMoney(p.row.amount) }}</q-td>
                  </template>
                </DataTable>
              </div>

              <!-- Notes -->
              <div v-if="result.notes" class="q-mt-md">
                <div class="text-caption text-weight-bold text-grey-7 q-mb-xs">NOTES</div>
                <div class="text-body2" style="white-space:pre-line">{{ result.notes }}</div>
              </div>
            </div>
          </div>
        </q-card-section>

        <q-card-actions align="right" class="q-px-md q-pb-md">
          <q-btn flat label="Annuler" @click="reset" />
          <q-btn color="primary" icon="save" label="Créer dans ERPNext" :loading="saving" @click="createInErpNext" />
        </q-card-actions>
      </q-card>

      <!-- Raw JSON toggle -->
      <q-expansion-item label="JSON brut" dense header-class="text-caption text-grey-7">
        <pre class="q-pa-sm" style="background:#f1f5f9;border-radius:8px;font-size:12px;overflow-x:auto">{{ JSON.stringify(result, null, 2) }}</pre>
      </q-expansion-item>
    </template>
  </q-page>
</template>

<script setup>
import { ref, onMounted } from 'vue'
import DataTable from 'src/components/shared/DataTable.vue'
import { ocrBill, checkOllamaStatus } from 'src/api/ocr'
import { createDoc } from 'src/api/erp'
import { formatMoney } from 'src/composables/useFormatters'
import { Notify } from 'quasar'

const preview = ref(null)
const imageBase64 = ref(null)
const processing = ref(false)
const saving = ref(false)
const result = ref(null)
const error = ref(null)
const ollamaStatus = ref(null)

const itemCols = [
  { name: 'description', label: 'Description', field: 'description', align: 'left' },
  { name: 'qty', label: 'Qté', field: 'qty', align: 'center' },
  { name: 'rate', label: 'Prix', field: 'rate', align: 'right' },
  { name: 'amount', label: 'Montant', field: 'amount', align: 'right' },
]

function onFile (e) {
  const file = e.target.files?.[0]
  if (!file) return
  error.value = null
  result.value = null
  preview.value = URL.createObjectURL(file)

  const reader = new FileReader()
  reader.onload = () => { imageBase64.value = reader.result }
  reader.readAsDataURL(file)
}

async function runOcr () {
  if (!imageBase64.value) return
  processing.value = true
  error.value = null
  try {
    result.value = await ocrBill(imageBase64.value)
  } catch (e) {
    error.value = e.message
  } finally {
    processing.value = false
  }
}

async function createInErpNext () {
  if (!result.value) return
  saving.value = true
  try {
    const r = result.value
    const doc = await createDoc('Purchase Invoice', {
      supplier: r.vendor || 'Unknown',
      bill_no: r.invoice_number || '',
      bill_date: r.date || new Date().toISOString().slice(0, 10),
      due_date: r.due_date || null,
      items: (r.items || []).map((item, i) => ({
        item_code: 'Expense - OCR',
        description: item.description,
        qty: item.qty || 1,
        rate: item.rate || item.amount || 0,
        idx: i + 1,
      })),
      remarks: r.notes || 'Imported via OCR',
    })
    Notify.create({ type: 'positive', message: 'Facture créée: ' + doc.name })
  } catch (e) {
    Notify.create({ type: 'negative', message: 'Erreur: ' + e.message })
  } finally {
    saving.value = false
  }
}

function reset () {
  preview.value = null
  imageBase64.value = null
  result.value = null
  error.value = null
}

onMounted(async () => {
  ollamaStatus.value = await checkOllamaStatus()
})
</script>

<style scoped>
.ocr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.ocr-field label {
  font-size: 0.72rem;
  font-weight: 600;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
</style>
