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

const grades = ['艺术类', '幼儿园', '一年级', '二年级', '三年级', '四年级', '五年级', '六年级']
const subjects = ['美术', '书法', '音乐', '舞蹈', '语文', '数学', '英语']
const initialDefaults: StudentProfileDefaults = {
  grade: '艺术类',
  subject: '美术',
  lessonDurationMinutes: 60
}

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

function normalizeDuration(value: number): number {
  if (Number.isNaN(value)) return 60
  return Math.min(360, Math.max(15, Math.round(value / 15) * 15))
}

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

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

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

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

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

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

  onDurationInput(event: InputEvent) {
    this.setData({ 'defaults.lessonDurationMinutes': normalizeDuration(Number(event.detail.value)) })
  },

  onDurationChange(event: PickerEvent) {
    this.setData({ 'defaults.lessonDurationMinutes': normalizeDuration(Number(event.detail.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 })
    }
  }
})