<template>
  <div>
    <div class="no-print">
      <button class="print-btn" :disabled="!printer" @click="print">Print QR Code</button>
      <label>Position:
        <select class="position-select" v-model="position">
          <option value="1">1 - Top Left</option>
          <option value="2">2 - Top Right</option>
          <option value="3">3 - Middle Left</option>
          <option value="4">4 - Middle Right</option>
          <option value="5">5 - Bottom Left</option>
          <option value="6">6 - Bottom Right</option>
        </select>
      </label>
    </div>

    <div v-if="loading" class="loading-msg">Loading...</div>

    <div v-else-if="printer" class="print-sheet">
      <div
        v-for="pos in 6"
        :key="pos"
        class="label"
        :class="[`pos-${pos}`, pos === parseInt(position) ? 'active' : 'inactive']"
      >
        <template v-if="pos === parseInt(position)">
          <div class="csf-name">{{ labelName }}</div>
          <div class="qr-container">
            <img v-if="qrImage" :src="qrImage" class="qr-img" alt="QR" />
          </div>
          <div class="info-section">
            <div class="info-inner">
              <div v-if="fqdn" class="info-row">{{ fqdn }}</div>
              <div v-if="ipAddress" class="info-row">{{ ipAddress }}</div>
            </div>
          </div>
        </template>
      </div>
    </div>

    <div v-else class="error-msg">Printer not found</div>
  </div>
</template>

<script setup>
import { ref, computed, onMounted, watch, nextTick } from 'vue'
import { useRoute } from 'vue-router'
import { printersApi } from '@/api'
import { renderQrDataUrl } from '@/utils/codes'
import { buildQrUrl } from '@/utils/qrTarget'
import { getPrinterHostnameTemplate } from '@/utils/siteSettings'

const route = useRoute()
const loading = ref(true)
const printer = ref(null)
const position = ref('1')
// Render QR to a data-URL image, not a live <canvas>: canvases are unreliable
// in print output, images print every time.
const qrImage = ref('')

// What goes on the label's prominent top line: the printer's NAME, e.g.
// 8201-HPLaserJetPro. Sites keep that name in different places - the Windows
// queue name when one is set, otherwise the asset's name, and in practice most
// printers carry it as the assetnumber and nothing else, so that is the last
// fallback rather than a blank label. This is a name, not an identifier line:
// the label deliberately carries no separate "Asset #".
const labelName = computed(() =>
  printer.value?.printer?.windowsname
  || printer.value?.name
  || printer.value?.assetnumber
  || '')

const ipAddress = computed(() => {
  // Check direct ipaddress field first (from list API)
  if (printer.value?.ipaddress && printer.value.ipaddress !== 'USB') return printer.value.ipaddress
  // Fall back to communications array (from detail API)
  if (!printer.value?.communications?.length) return null
  const primary = printer.value.communications.find(c => c.isprimary) || printer.value.communications[0]
  return primary?.ipaddress || primary?.address || null
})

// The printer's FQDN. A stored hostname wins; otherwise the site builds one from
// the IP through the printer_hostname_template setting (ADR-015), the same way
// PrinterForm and the toner report derive it.
const hostnameTemplate = ref('')

const fqdn = computed(() => {
  const stored = printer.value?.printer?.hostname
  if (stored) return stored
  if (!ipAddress.value || !hostnameTemplate.value) return ''
  return hostnameTemplate.value.replace('{ip}', ipAddress.value.replace(/\./g, '-'))
})

onMounted(async () => {
  try {
    hostnameTemplate.value = await getPrinterHostnameTemplate()
    const response = await printersApi.get(route.params.id)
    printer.value = response.data.data
  } catch (error) {
    console.error('Error loading printer:', error)
  } finally {
    loading.value = false
    await nextTick()
    generateQR()
  }
})

watch(position, async () => {
  await nextTick()
  generateQR()
})

async function generateQR() {
  if (!printer.value) return
  const p = printer.value
  const detailId = p.printer?.printerid || p.assetid
  const qrUrl = await buildQrUrl('qr_target_printer', `/printers/${detailId}`, {
    printerid: p.printer?.printerid || '',
    assetid: p.assetid || '',
    assetnumber: p.assetnumber || '',
    serialnumber: p.serialnumber || '',
    ip: ipAddress.value || '',
    hostname: p.printer?.windowsname || p.name || '',
  })
  qrImage.value = await renderQrDataUrl(qrUrl)
}

function print() {
  window.print()
}
</script>

<style scoped>
@page { size: letter; margin: 0; }

.no-print { margin-bottom: 20px; text-align: center; padding: 20px; }

.print-btn {
  padding: 10px 30px;
  font-size: 16px;
  cursor: pointer;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 5px;
  margin: 5px;
}
.print-btn:hover:not(:disabled) { background: var(--primary-dark); }
.print-btn:disabled { background: var(--text-light); cursor: not-allowed; }

.position-select { padding: 8px; font-size: 14px; margin-left: 10px; }

.loading-msg, .error-msg {
  text-align: center;
  padding: 2rem;
  font-size: 1.125rem;
  color: var(--text-light);
}

.print-sheet {
  width: 8.5in;
  height: 11in;
  background: white;
  margin: 0 auto;
  position: relative;
  border: 1px solid #ccc;
}

.label {
  width: 3in;
  height: 3in;
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.1in;
  box-sizing: border-box;
}
.label.inactive { border: 1px dashed #ccc; }
.label.active { border: 2px solid var(--primary); }

.qr-img { width: 144px; height: 144px; display: block; }

.pos-1 { top: 0.875in; left: 1.1875in; }
.pos-2 { top: 0.875in; left: 4.3125in; }
.pos-3 { top: 4in; left: 1.1875in; }
.pos-4 { top: 4in; left: 4.3125in; }
.pos-5 { top: 7.125in; left: 1.1875in; }
.pos-6 { top: 7.125in; left: 4.3125in; }

.model-name { font-size: 11pt; font-weight: bold; text-align: center; margin-bottom: 0.1in; color: #000; }
.qr-container { text-align: center; }
.info-section { margin-top: 0.1in; display: flex; flex-direction: column; align-items: center; }
.info-inner { text-align: left; }
.info-row { font-size: 9pt; color: #333; margin: 1px 0; white-space: nowrap; }
.csf-name { font-size: 12pt; font-weight: bold; font-family: monospace; text-align: center; margin-bottom: 0.06in; color: #000; }

@media print {
  /* Force rendered images/colors to print even when "Background graphics" is
     off, otherwise the QR image can drop out. */
  body, .print-sheet, .label, .qr-img, .qr-container {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  body { padding: 0; margin: 0; background: white; }
  .no-print { display: none !important; }
  .print-sheet { border: none; margin: 0; width: 8.5in; height: 11in; overflow: hidden; }
  .label { border: none !important; }
  .label.inactive { visibility: hidden; }
}
</style>
