// ─────────────────────────────────────────────────────────────────────────────
// Field-targeted scanner overlay (Gemini single-value extraction).
// Opt-in: pages include this when ui.page({ includeScanner: true }).
//
// Usage from page code:
//   scanner.open('serial_number', 'Numéro de série', function (value) {
//     // value is confirmed by the tech; write it into the target input.
//   }, { equipment_type, brand, model })
//
// The page must also include <div id="fsOv"> markup, which shell.js injects
// automatically when includeScanner is on.
// ─────────────────────────────────────────────────────────────────────────────
(function () {
  var stream = null
  var field = ''
  var fieldLabel = ''
  var ctx = {}
  var callback = null

  function $ (id) { return document.getElementById(id) }
  function esc (s) { return window._esc(s) }

  function open (fieldKey, label, cb, context) {
    field = fieldKey; fieldLabel = label; callback = cb; ctx = context || {}
    $('fsLabel').textContent = 'Scanner : ' + label
    $('fsResult').innerHTML = '<div class="sr sm ta-c">Cadrez l\'étiquette puis appuyez sur <b>Capturer</b></div>'
    $('fsOv').classList.add('open')
    startCam()
  }

  function close () {
    $('fsOv').classList.remove('open')
    stopCam()
    callback = null
  }

  function startCam () {
    var v = $('fsVid')
    if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
      v.style.display = 'none'
      $('fsResult').innerHTML = '<div class="sr" style="color:#ef4444">Caméra indisponible</div>'
      return
    }
    navigator.mediaDevices.getUserMedia({
      video: { facingMode: 'environment', width: { ideal: 1280 }, height: { ideal: 720 } }
    }).then(function (s) {
      stream = s
      v.srcObject = s
      v.style.display = 'block'
    }).catch(function (e) {
      $('fsResult').innerHTML = '<div class="sr" style="color:#ef4444">Caméra refusée: ' + (e.message || '') + '</div>'
    })
  }
  function stopCam () {
    if (stream) { stream.getTracks().forEach(function (t) { t.stop() }); stream = null }
    var v = $('fsVid'); if (v) v.srcObject = null
  }

  function capture () {
    var v = $('fsVid'), c = $('fsCnv')
    if (!v.videoWidth) { window.toast('Caméra non prête', false); return }
    c.width = v.videoWidth; c.height = v.videoHeight
    var cctx = c.getContext('2d'); cctx.drawImage(v, 0, 0, c.width, c.height)
    var b64 = c.toDataURL('image/jpeg', 0.85)

    $('fsResult').innerHTML = '<div class="sr sm ta-c">🤖 Analyse par Gemini Vision…</div>'

    var payload = { image: b64, field: field }
    if (ctx.equipment_type) payload.equipment_type = ctx.equipment_type
    if (ctx.brand)          payload.brand          = ctx.brand
    if (ctx.model)          payload.model          = ctx.model
    if (ctx.hint)           payload.hint           = ctx.hint

    window.api.post('/field-scan', payload).then(function (r) {
      var d = r.data || {}
      if (!d.ok || !d.value) {
        $('fsResult').innerHTML = '<div class="sr" style="color:#ef4444;text-align:center">❌ Non détecté — rapprochez-vous et réessayez.</div>'
        return
      }
      var pct = Math.round((d.confidence || 0) * 100)
      var color = pct >= 70 ? '#22c55e' : pct >= 40 ? '#f59e0b' : '#ef4444'
      $('fsResult').innerHTML =
        '<div class="sr">' +
          '<div class="fs-val">' + esc(d.value) + '</div>' +
          '<div class="sm ta-c">Confiance : <b style="color:' + color + '">' + pct + '%</b></div>' +
          '<div class="conf-bar"><div class="f" style="width:' + pct + '%;background:' + color + '"></div></div>' +
          '<div style="display:flex;gap:8px;margin-top:12px">' +
            '<button class="btn btn-sm" style="background:' + color + ';color:#fff;flex:1" onclick="scanner.confirm(&quot;' + esc(d.value) + '&quot;)">✓ Utiliser</button>' +
            '<button class="btn btn-sm btn-muted" onclick="scanner.capture()">↻ Réessayer</button>' +
          '</div>' +
        '</div>'
    }).catch(function (e) {
      $('fsResult').innerHTML = '<div class="sr" style="color:#ef4444">Erreur réseau : ' + (e.message || '') + '</div>'
    })
  }

  function confirm (value) {
    if (callback) callback(value)
    close()
  }

  // Bind close button + ESC
  window.addEventListener('load', function () {
    var x = document.querySelector('#fsOv .fs-close')
    if (x) x.addEventListener('click', close)
    var cap = document.querySelector('#fsOv .fs-capture')
    if (cap) cap.addEventListener('click', capture)
    var can = document.querySelector('#fsOv .fs-cancel')
    if (can) can.addEventListener('click', close)
  })

  window.scanner = { open: open, close: close, capture: capture, confirm: confirm }
})()