<template>
  <ReportScaffold
    title="Âge des comptes à recevoir"
    :loading="loading" :error="error" :has-run="hasRun"
    :cards="cards" :columns="columns" :rows="rows" row-key="customer" searchable
    :pagination="{ rowsPerPage: 50, sortBy: 'total', descending: true }"
    empty="Aucun solde à recevoir à cette date."
    @retry="loadReport" @export="doExport">
    <template #filters>
      <q-input v-model="asOfDate" type="date" label="En date du" dense outlined stack-label style="width:160px;max-width:100%" />
      <q-btn color="primary" label="Générer" icon="play_arrow" @click="loadReport" :loading="loading" />
    </template>
    <template #chart>
      <div v-if="summary" class="ops-card q-mb-md" style="height:280px;position:relative"><canvas ref="chartCanvas"></canvas></div>
    </template>
    <template #body-cell-total="props">
      <q-td :props="props"><span class="text-weight-bold text-negative">{{ formatMoney(props.value) }}</span></q-td>
    </template>
    <template #body-cell-d120="props">
      <q-td :props="props">
        <span :class="props.value > 0 ? 'text-negative text-weight-bold' : ''">{{ props.value > 0 ? formatMoney(props.value) : '—' }}</span>
      </q-td>
    </template>
  </ReportScaffold>
</template>

<script setup>
import { ref, computed, nextTick } from 'vue'
import { fetchARReport } from 'src/api/reports'
import { formatMoney } from 'src/composables/useFormatters'
import { exportCsv } from 'src/composables/useCsvExport'
import ReportScaffold from 'src/components/shared/ReportScaffold.vue'
let Chart = null // chart.js ~90 KB → chargé à la demande au 1er rendu de graphique (hors du chunk de la page)

const asOfDate = ref(new Date().toISOString().slice(0, 10))
const loading = ref(false)
const error = ref('')
const hasRun = ref(false)
const rows = ref([])
const summary = ref(null)
const chartCanvas = ref(null)
let chartInstance = null

const cards = computed(() => {
  const s = summary.value
  if (!s) return []
  return [
    { label: 'Courant', value: formatMoney(s.current), valueClass: 'text-positive' },
    { label: '30 jours', value: formatMoney(s.d30), valueClass: 'text-warning' },
    { label: '60 jours', value: formatMoney(s.d60), valueClass: 'text-orange' },
    { label: '90 jours', value: formatMoney(s.d90), valueClass: 'text-deep-orange' },
    { label: '120+ jours', value: formatMoney(s.d120), valueClass: 'text-negative' },
    { label: 'Total dû', value: formatMoney(s.total), valueClass: 'text-negative' },
  ]
})

const columns = [
  { name: 'customer', label: '#Client', field: 'customer', align: 'left', sortable: true },
  { name: 'customer_name', label: 'Nom', field: 'customer_name', align: 'left', sortable: true },
  { name: 'current', label: 'Courant', field: 'current', align: 'right', sortable: true, format: v => v > 0 ? formatMoney(v) : '—' },
  { name: 'd30', label: '30 jours', field: 'd30', align: 'right', sortable: true, format: v => v > 0 ? formatMoney(v) : '—' },
  { name: 'd60', label: '60 jours', field: 'd60', align: 'right', sortable: true, format: v => v > 0 ? formatMoney(v) : '—' },
  { name: 'd90', label: '90 jours', field: 'd90', align: 'right', sortable: true, format: v => v > 0 ? formatMoney(v) : '—' },
  { name: 'd120', label: '120+', field: 'd120', align: 'right', sortable: true },
  { name: 'total', label: 'Total', field: 'total', align: 'right', sortable: true },
]

async function loadReport () {
  loading.value = true
  error.value = ''
  hasRun.value = true
  try {
    const res = await fetchARReport(asOfDate.value)
    rows.value = res.rows || []
    summary.value = res.summary || null
    await nextTick()
    renderChart()
  } catch (e) {
    console.error('AR report error:', e)
    error.value = 'Échec du chargement du rapport — réessayez.'
  } finally {
    loading.value = false
  }
}

async function renderChart () {
  if (chartInstance) chartInstance.destroy()
  if (!chartCanvas.value || !summary.value) return
  if (!Chart) Chart = (await import('chart.js/auto')).default
  const s = summary.value
  chartInstance = new Chart(chartCanvas.value, {
    type: 'doughnut',
    data: {
      labels: ['Courant', '30 jours', '60 jours', '90 jours', '120+ jours'],
      datasets: [{
        data: [s.current, s.d30, s.d60, s.d90, s.d120],
        backgroundColor: ['#10b981', '#f59e0b', '#f97316', '#ef4444', '#991b1b'],
        borderWidth: 2,
        borderColor: '#fff',
      }],
    },
    options: {
      responsive: true,
      maintainAspectRatio: false,
      plugins: {
        legend: { position: 'right', labels: { font: { size: 12 } } },
        tooltip: { callbacks: { label: ctx => ctx.label + ': ' + formatMoney(ctx.parsed) } },
      },
    },
  })
}

function doExport () {
  if (!rows.value.length) return
  const headers = ['#Client', 'Nom', 'Courant', '30 jours', '60 jours', '90 jours', '120+ jours', 'Total']
  const data = rows.value.map(r => [r.customer, r.customer_name, r.current.toFixed(2), r.d30.toFixed(2), r.d60.toFixed(2), r.d90.toFixed(2), r.d120.toFixed(2), r.total.toFixed(2)])
  const totalRow = summary.value
    ? ['', 'TOTAL', summary.value.current.toFixed(2), summary.value.d30.toFixed(2), summary.value.d60.toFixed(2), summary.value.d90.toFixed(2), summary.value.d120.toFixed(2), summary.value.total.toFixed(2)]
    : null
  exportCsv(`age_comptes_${asOfDate.value}`, headers, data, { totalRow })
}
</script>
