var ble = require('../../services/ble')
var i18n = require('../../i18n/index')

// Manual care page: user directly picks a care function (-> single light
// wavelength), regions and duration, then starts — skipping the smart scan.
//
// Care function -> wavelength (protocol WAVELENGTH: IR=1, R=2, UV=3, Y=4).
// SINGLE light per session: buildVendorCommand only lights one wavelength.
// FUTURE EXTENSION: a composite/multi-light care mode would require the vendor
// command builder to accept several wavelengths at once — not implemented here.
Page({
  data: {
    statusBarHeight: 44,
    // fixed safe brightness for care sessions: 140 ≈ 55% (护理中档位).
    // Do NOT expose a brightness slider (safety); the hardware also enforces
    // its own current/thermal limits regardless of this value.
    brightness: 140,
    functions: [
      { id: 'rejuvenate', wavelength: 2, wl: 'red', color: '#E8503A' },
      { id: 'acne', wavelength: 3, wl: 'uv', color: '#7C4DFF' },
      { id: 'eventone', wavelength: 4, wl: 'yellow', color: '#F5B841' },
      { id: 'revitalize', wavelength: 1, wl: 'infrared', color: '#8B2E3C' }
    ],
    selectedFunctionId: 'rejuvenate',
    selectedWavelength: 2,
    // region mask mapping identical to treatment-setup: 右=0x01 左=0x02 上=0x04 中=0x08 下=0x10
    regions: [
      { key: 'right', mask: 0x01, checked: true },
      { key: 'left', mask: 0x02, checked: true },
      { key: 'top', mask: 0x04, checked: true },
      { key: 'middle', mask: 0x08, checked: true },
      { key: 'bottom', mask: 0x10, checked: true }
    ],
    // safety: a single session must NOT exceed 10 minutes (hardware caps at 10).
    durations: [5, 10],
    selectedMinutes: 10,
    durationOptions: [],
    submitting: false,
    error: ''
  },

  onLoad: function () {
    var app = getApp()
    if (app && app.globalData && app.globalData.statusBarHeight) {
      this.setData({ statusBarHeight: app.globalData.statusBarHeight })
    }
  },

  onShow: function () {
    i18n.bind(this)
    this.refreshDurationOptions()
  },

  // Duration labels carry a dynamic number, which WXML cannot substitute, so
  // build the final strings in JS. Re-run on every onShow to follow locale.
  refreshDurationOptions: function () {
    var options = this.data.durations.map(function (min) {
      return { min: min, label: i18n.t('manual.durationUnit', { min: min }) }
    })
    this.setData({ durationOptions: options })
  },

  onBack: function () {
    wx.navigateBack({
      fail: function () {
        wx.reLaunch({ url: '/pages/index/index' })
      }
    })
  },

  onSelectFunction: function (e) {
    var id = e.currentTarget.dataset.id
    var funcs = this.data.functions
    var wavelength = this.data.selectedWavelength
    for (var i = 0; i < funcs.length; i++) {
      if (funcs[i].id === id) {
        wavelength = funcs[i].wavelength
        break
      }
    }
    this.setData({ selectedFunctionId: id, selectedWavelength: wavelength })
  },

  onToggleRegion: function (e) {
    var idx = e.currentTarget.dataset.idx
    var regions = this.data.regions
    regions[idx].checked = !regions[idx].checked
    this.setData({ regions: regions })
  },

  onSelectDuration: function (e) {
    var min = parseInt(e.currentTarget.dataset.min, 10)
    this.setData({ selectedMinutes: min })
  },

  onStart: function () {
    var self = this

    if (!ble.isConnected()) {
      self.setData({ error: i18n.t('common.deviceNotConnected') })
      return
    }

    var mask = 0
    self.data.regions.forEach(function (r) {
      if (r.checked) mask |= r.mask
    })

    if (mask === 0) {
      wx.showToast({ title: i18n.t('manual.noRegionSelected'), icon: 'none' })
      return
    }

    var wavelength = self.data.selectedWavelength
    var durationMs = self.data.selectedMinutes * 60000

    self.setData({ submitting: true, error: '' })

    ble.setParams({
      region_mask: mask,
      wavelength: wavelength,
      brightness: self.data.brightness,
      duration_ms: durationMs,
      mode: 0,
      control: 0x02
    }).then(function () {
      return ble.startTreatment(mask)
    }).then(function () {
      self.setData({ submitting: false })
      wx.redirectTo({
        url: '/pages/treating/treating?regions=' + mask +
          '&wavelength=' + wavelength +
          '&duration=' + durationMs +
          '&mode=0'
      })
    }).catch(function (err) {
      self.setData({
        submitting: false,
        error: (err && err.error_msg) || i18n.t('manual.startFailed')
      })
    })
  }
})