import {
  copyApiRequestId,
  getApiErrorMessage,
  getApiRequestId,
  getProfileDefaults,
  updateProfileDefaults
} from '../../utils/api'
import type { StudentProfileDefaults } from '../../utils/types'

const grades = ['初一', '初二', '初三']
const subjects = ['美术', '书法', '音乐', '舞蹈', '语文', '数学', '英语']
const durationPresets = [45, 60, 90, 120]
const durationStep = 15
const minimumDuration = 15
const maximumDuration = 360
const initialDefaults: StudentProfileDefaults = {
  grade: '初一',
  subject: '数学',
  lessonDurationMinutes: 60
}

type PickerEvent = { detail: { value: string | number } }

function normalizeDuration(value: number): number {
  if (Number.isNaN(value)) return 60
  return Math.min(maximumDuration, Math.max(minimumDuration, Math.round(value / durationStep) * durationStep))
}

Page({
  data: {
    defaults: initialDefaults,
    grades,
    subjects,
    durationPresets,
    minimumDuration,
    maximumDuration,
    loading: false,
    saving: false,
    errorMessage: '',
    errorRequestId: ''
  },

  onShow() {
    void this.loadDefaults()
  },

  async loadDefaults(showSuccess = false) {
    this.setData({ loading: true, errorMessage: '', errorRequestId: '' })
    try {
      const defaults = await getProfileDefaults()
      this.setData({
        defaults: {
          ...defaults,
          lessonDurationMinutes: normalizeDuration(defaults.lessonDurationMinutes)
        }
      })
      if (showSuccess) wx.showToast({ title: '预设已刷新', icon: 'success' })
    } catch (error) {
      this.setData({ errorMessage: getApiErrorMessage(error), errorRequestId: getApiRequestId(error) })
    } finally {
      this.setData({ loading: false })
    }
  },

  onReload() {
    void this.loadDefaults(true)
  },

  copyRequestId() {
    copyApiRequestId(this.data.errorRequestId)
  },

  onGradeChange(event: PickerEvent) {
    this.setData({ 'defaults.grade': grades[Number(event.detail.value)] })
  },

  onSubjectChange(event: PickerEvent) {
    this.setData({ 'defaults.subject': subjects[Number(event.detail.value)] })
  },

  decreaseDuration() {
    this.setData({
      'defaults.lessonDurationMinutes': normalizeDuration(
        this.data.defaults.lessonDurationMinutes - durationStep
      )
    })
  },

  increaseDuration() {
    this.setData({
      'defaults.lessonDurationMinutes': normalizeDuration(
        this.data.defaults.lessonDurationMinutes + durationStep
      )
    })
  },

  selectDurationPreset(event: WechatMiniprogram.TouchEvent) {
    const { value } = event.currentTarget.dataset as { value: number | string }
    this.setData({ 'defaults.lessonDurationMinutes': normalizeDuration(Number(value)) })
  },

  async save() {
    const defaults = {
      ...this.data.defaults,
      lessonDurationMinutes: normalizeDuration(this.data.defaults.lessonDurationMinutes)
    }
    this.setData({ saving: true })
    try {
      const saved = await updateProfileDefaults(defaults)
      this.setData({ defaults: saved, errorMessage: '' })
      wx.showToast({ title: '预设项已保存', icon: 'success' })
      setTimeout(() => wx.navigateBack(), 450)
    } catch (error) {
      wx.showToast({ title: getApiErrorMessage(error), icon: 'none' })
    } finally {
      this.setData({ saving: false })
    }
  }
})