var api = require('../../utils/api'), image = require('../../utils/image'), voice = require('../../utils/voice');
var permissions = require('../../utils/permissions');
var development = require('../../utils/development');
var config = require('../../config');
var STEPS = [
  { target: 'front', tip: '请单人正脸出镜', turn: '正脸居中', mask: 0 },
  { target: 'right', tip: '请右脸出镜', turn: '请向左转头', mask: 2 },
  { target: 'left', tip: '请左脸出镜', turn: '请向右转头', mask: 1 }
];
Page({
  data: { stepIndex: 0, stepText: '1/3', stepTip: STEPS[0].tip, guides: ['正脸居中', '取下眼镜', '光线充足'],
    maskStep: 0, devicePosition: 'front', camError: false, previewUrl: '', doneTip: '', analyzing: false,
    compressWidth: 1, compressHeight: 1, cameraEnabled: false, permissionMessage: '',
    debugMode: false, debugComplete: false, debugPhotos: [],
    showDiagnose: config.environment !== 'production', diagText: '', cameraSupported: false },
  onLoad: function (query) {
    this.alive = true; this.visible = true; this.photos = []; this.busy = false; this.seq = 0;
    var supported = config.nativeCamera === true &&
      (typeof permissions.cameraSupported === 'function' ? permissions.cameraSupported() : true);
    this.cameraSupported = supported;
    this.debugMode = !!(query && query.debug === 'camera' && development.cameraDebugEnabled());
    this.setData({ debugMode: this.debugMode, cameraSupported: supported });
    if (this.debugMode) return;
    var app = typeof getApp === 'function' ? getApp() : null;
    if (!api.user() || !app || !app.globalData.profile) { my.redirectTo({ url: '/pages/splash/splash' }); return; }
    if (!supported) {
      // 淘宝 <camera> 组件不可用：直接用系统相机/相册，页面不再挂相机组件（否则整页崩溃）
      this.setData({ cameraEnabled: false, camError: true,
        permissionMessage: '请用下方按钮拍摄，三张依次为正脸、右脸、左脸。' });
    }
  },
  onReady: function () {
    this.pageReady = true;
    if (this.cameraAuthorized) this.mountCamera();
  },
  onShow: function () {
    this.visible = true;
    if (!this.data.previewUrl && !this.data.analyzing && !this.data.debugComplete) this.renderStep();
    if (!this.cameraSupported) return; // 平台没有内置相机：直接用系统相机/相册
    var that = this;
    permissions.settings().then(function (current) {
      if (!that.alive || !that.visible) return;
      if (permissions.state(current, 'scope.camera') === true) { that.cameraAuthorized = true; that.mountCamera(); }
      else if (permissions.state(current, 'scope.camera') === false) that.setData({ cameraEnabled: false, permissionMessage: '相机权限未开启，可前往授权设置或使用相册。' });
    }).catch(function () {});
  },
  mountCamera: function () {
    if (!this.alive || !this.visible || !this.pageReady || this.data.cameraEnabled || this.data.debugComplete) return;
    if (!this.cameraSupported) return;
    var that = this;
    this.setData({ cameraEnabled: true, camError: false }, function () {
      if (!that.alive || !that.visible) return;
      try {
        that.cameraCtx = my.createCameraContext('skin-camera');
        if (!that.cameraCtx || !that.cameraCtx.takePhoto) that.onCameraError();
      } catch (_) { that.onCameraError(); }
    });
  },
  onEnableCamera: function () {
    if (this.authorizing) return;
    var that = this; this.authorizing = true;
    permissions.ensure('scope.camera').then(function () { that.cameraAuthorized = true; that.mountCamera(); }).catch(function (err) {
      if (that.alive && that.visible) that.setData({ permissionMessage: err.message });
    }).then(function () { that.authorizing = false; });
  },
  onOpenSettings: function () {
    var that = this;
    permissions.open().then(function (current) {
      if (permissions.state(current, 'scope.camera') === true) { that.cameraAuthorized = true; that.mountCamera(); }
    }).catch(function (err) { if (that.alive) my.showToast({ content: err.message, type: 'none' }); });
  },
  onCloseDiagnose: function () { this.setData({ diagText: '' }); },
  // 开发版：把真机上的相机能力/授权返回值直接打在页面上，供截图定位
  onDiagnose: function () {
    var that = this;
    this.setData({ diagText: '检测中…' });
    permissions.diagnose().then(function (info) {
      if (that.alive) that.setData({ diagText: info.join('\n') });
    }).catch(function (err) {
      if (that.alive) that.setData({ diagText: 'diagnose error: ' + (err && err.message ? err.message : String(err)) });
    });
  },
  onHide: function () { this.pause(); },
  onUnload: function () { this.pause(); this.alive = false; this.photos = []; this.debugResults = []; },
  pause: function () {
    this.visible = false; this.seq++; this.busy = false;
    clearTimeout(this.nextTimer);
    if (this.signal) this.signal.canceled = true;
    voice.stop(true);
    this.cameraCtx = null;
    if (this.alive) this.setData({ cameraEnabled: false });
    if (this.alive && this.data.analyzing) this.setData({ analyzing: false, doneTip: '' });
  },
  renderStep: function () {
    var cfg = STEPS[this.data.stepIndex];
    this.setData({ stepText: (this.data.stepIndex + 1) + '/3', stepTip: cfg.tip,
      guides: [cfg.turn, '取下眼镜', '光线充足'], maskStep: cfg.mask, doneTip: '' });
    if (!this.debugMode) voice.play(voice.VOICE.step[this.data.stepIndex]);
  },
  onCameraError: function () {
    this.setData({ camError: true, cameraEnabled: false, permissionMessage: '相机暂不可用，请检查淘宝的系统相机权限，或使用系统相机/相册。' });
    my.showToast({ content: '相机不可用，请使用系统相机或相册', type: 'none' });
  },
  onCameraStop: function () { if (this.alive && this.visible) this.onCameraError(); },
  onShutter: function () {
    if (this.busy || this.data.previewUrl || this.data.analyzing) return;
    if (this.data.camError || !this.cameraCtx) return this.choose(['camera']);
    var that = this, seq = this.seq;
    this.busy = true;
    this.cameraCtx.takePhoto({ quality: 'high', success: function (res) {
      if (!that.alive || !that.visible || seq !== that.seq) return;
      var file = res.tempImagePath || res.tempFilePath || res.apFilePath;
      if (file) that.setData({ previewUrl: file });
      else my.showToast({ content: '拍摄失败，请重试', type: 'none' });
    }, fail: function () {
      if (!that.alive || !that.visible || seq !== that.seq) return;
      // 真机上内置相机 takePhoto 失败（机型/组件差异、权限被拒等）：
      // 不打断流程，直接退回系统相机走 my.chooseImage 那条已验证过的路。
      that.busy = false;
      my.showToast({ content: '内置相机不可用，改用系统相机', type: 'none' });
      that.choose(['camera']);
    }, complete: function () { if (seq === that.seq) that.busy = false; } });
  },
  choose: function (sourceType) {
    if (this.busy || this.data.previewUrl || this.data.analyzing) return;
    var that = this;
    this.busy = true;
    // chooseImage has its own album scope; native capture also needs camera.
    permissions.ensure('scope.album').then(function () {
      if (sourceType[0] === 'camera') return permissions.ensure('scope.camera');
    }).then(function () {
      if (!that.alive || !that.visible) { that.busy = false; return; }
      my.chooseImage({ count: 1, sourceType: sourceType,
      success: function (res) {
        var paths = res.apFilePaths || res.tempFilePaths || [];
        if (that.alive && paths[0]) that.setData({ previewUrl: paths[0] });
      }, fail: function () { if (that.alive && that.visible) my.showToast({ content: '未选取照片，可重试或检查系统权限', type: 'none' }); },
      complete: function () { that.busy = false; } });
    }).catch(function (err) {
      that.busy = false;
      if (that.alive && that.visible) { that.setData({ permissionMessage: err.message }); my.showToast({ content: err.message, type: 'none' }); }
    });
  },
  onSystemCamera: function () { this.choose(['camera']); },
  onAlbum: function () { this.choose(['album']); },
  onFlip: function () {
    if (this.busy || this.data.previewUrl || this.data.analyzing) return;
    this.setData({ devicePosition: this.data.devicePosition === 'front' ? 'back' : 'front' });
  },
  onRetake: function () { if (!this.busy) this.setData({ previewUrl: '' }); },
  onConfirm: function () {
    if (this.busy || !this.data.previewUrl || this.data.analyzing) return;
    var that = this, step = this.data.stepIndex;
    this.busy = true; this.photos[step] = this.data.previewUrl;
    if (!this.debugMode) voice.play(voice.VOICE.shot, { cut: true });
    if (step === 2) { this.setData({ previewUrl: '' }); this.submitPhotos(); return; }
    this.setData({ stepIndex: step + 1, previewUrl: '', doneTip: '拍摄完成。下一张：' + STEPS[step + 1].tip + '，' + STEPS[step + 1].turn });
    this.nextTimer = setTimeout(function () {
      if (!that.alive || !that.visible) return;
      that.busy = false; that.renderStep();
    }, 2000);
  },
  submitPhotos: function () {
    if (!this.photos[0] || !this.photos[1] || !this.photos[2]) return;
    var that = this, seq = ++this.seq, dataUrls = [];
    var debugResults = [];
    this.signal = { canceled: false }; var signal = this.signal;
    this.busy = true; this.setData({ analyzing: true, doneTip: '' });
    if (!this.debugMode) voice.play(voice.VOICE.analyzing);
    // One shared native canvas: draw the photos sequentially.
    this.photos.reduce(function (chain, photo) {
      return chain.then(function () {
        if (signal.canceled) throw { canceled: true };
        return image.compressToBase64(photo, that);
      }).then(function (value) {
        dataUrls.push(value);
        if (that.debugMode) debugResults.push({ key: STEPS[debugResults.length].target,
          title: STEPS[debugResults.length].tip.replace(/^请/, ''), photo: photo,
          width: that.data.compressWidth, height: that.data.compressHeight,
          kilobytes: Math.round(value.replace(/^data:[^,]+,/, '').length * 3 / 4 / 1024) });
      });
    }, Promise.resolve()).then(function () {
      if (signal.canceled) throw { canceled: true };
      if (that.debugMode) {
        if (!that.alive || !that.visible || seq !== that.seq) return;
        that.busy = false; that.cameraCtx = null;
        dataUrls = []; // Do not keep base64, upload, create an account or touch report state.
        that.setData({ analyzing: false, cameraEnabled: false, debugComplete: true, debugPhotos: debugResults });
        return;
      }
      var ordered = [dataUrls[0], dataUrls[2], dataUrls[1]];
      return api.analyze(ordered, getApp().globalData.profile, signal).then(function (payload) {
        if (!that.alive || !that.visible || seq !== that.seq) return;
        getApp().globalData.photos = ordered; getApp().globalData.payload = payload;
        voice.stop(true); my.redirectTo({ url: '/pages/report/report' });
      });
    }).catch(function (err) {
      if (err.canceled || !that.alive || !that.visible || seq !== that.seq) return;
      that.busy = false; that.setData({ analyzing: false });
      if (!that.debugMode) voice.play(voice.VOICE.fail, { cut: true });
      my.showToast({ content: err.message || '照片处理失败，请重新拍摄', type: 'none', duration: 3000 });
    });
  },
  onDebugRestart: function () {
    if (!this.debugMode || !development.cameraDebugEnabled()) return;
    this.photos = []; this.busy = false; this.seq++;
    this.setData({ debugComplete: false, debugPhotos: [], stepIndex: 0, previewUrl: '', analyzing: false });
    this.renderStep(); this.onEnableCamera();
  },
  onCancel: function () {
    if (this.debugMode) { this.photos = []; this.setData({ debugPhotos: [], previewUrl: '' }); }
    this.pause(); my.navigateBack();
  },
  noop: function () {}
});