import { computed } from 'vue'
import { roundTypeOptions, scoreTypeOptions } from '@/constants/business'

export interface QuestionItem {
  id: string
  questionId: string | null
  score: number
  time: number
  title: string
  scoreType: Api.Competition.QuestionScoreType
  uiType?: string
  templateId?: number
}

export interface RoundModel {
  id: string
  name: string
  questions: QuestionItem[]
}

function generateId() {
  return `q_${Date.now()}_${Math.random().toString(36).slice(2, 9)}`
}

export function useQuestionConfig(props: any) {
  // 计算每个轮次的分数
  const getRoundScore = (roundIndex: number) => {
    const round = props.modelValue?.rounds?.[roundIndex]
    if (!round)
      return 0
    return round.questions.reduce((sum: number, item: any) => sum + (Number(item.score) || 0), 0)
  }

  // 计算每个轮次的时长
  const getRoundTime = (roundIndex: number) => {
    const round = props.modelValue?.rounds?.[roundIndex]
    if (!round)
      return 0
    return round.questions.reduce((sum: number, item: any) => sum + (Number(item.time) || 0), 0)
  }

  // 总计统计
  const totalStats = computed(() => {
    const rounds = props.modelValue?.rounds || []
    return rounds.reduce((acc: any, round: any) => {
      acc.count += round.questions.length
      acc.score += round.questions.reduce((sum: number, item: any) => sum + (Number(item.score) || 0), 0)
      acc.time += round.questions.reduce((sum: number, item: any) => sum + (Number(item.time) || 0), 0)
      return acc
    }, { count: 0, score: 0, time: 0 })
  })

  // 新增轮次
  function addRound(customName?: string, customCount?: number, roundType?: Api.Competition.CompetitionRoundType) {
    if (!props.modelValue.rounds) {
      props.modelValue.rounds = []
    }
    const index = props.modelValue.rounds.length + 1
    const count = typeof customCount === 'number' ? customCount : 10
    const name = typeof customName === 'string' ? customName : `第${index}轮：比赛环节`

    props.modelValue.rounds.push({
      id: `round_${Date.now()}`,
      name,
      roundType: roundType || roundTypeOptions[0].value,
      questions: Array.from({ length: count }).map(() => ({
        id: generateId(),
        questionId: null,
        score: 5,
        time: 30,
        title: '',
        scoreType: scoreTypeOptions[0].value,
      })),
    })
  }

  // 删除轮次
  function removeRound(index: number) {
    props.modelValue.rounds.splice(index, 1)
    // 重命名剩余轮次
    props.modelValue.rounds.forEach((round: RoundModel, idx: number) => {
      round.name = round.name.replace(/第\d+轮/, `第${idx + 1}轮`)
    })
  }

  // 新增题目
  function addQuestion(roundIndex: number) {
    const round = props.modelValue.rounds[roundIndex]
    if (round) {
      round.questions.push({
        id: generateId(),
        value: null,
        score: 5,
        time: 30,
        title: '',
        scoreType: scoreTypeOptions[0].value,
      })
    }
  }

  // 删除题目
  function removeQuestion(roundIndex: number, questionIndex: number) {
    const round = props.modelValue.rounds[roundIndex]
    if (round) {
      round.questions.splice(questionIndex, 1)
    }
  }

  function validate() {
    const rounds = props.modelValue?.rounds || []
    if (rounds.length === 0) {
      window.$message?.error('请至少配置一个比赛环节')
      return false
    }

    for (let i = 0; i < rounds.length; i++) {
      const round = rounds[i]
      if (round.questions.length === 0) {
        window.$message?.error(`${round.name} 至少需要配置一道题目`)
        return false
      }
      for (let j = 0; j < round.questions.length; j++) {
        const question = round.questions[j]
        const questionPrefix = `${round.name} 第 ${j + 1} 题`

        if (!question.questionId) {
          window.$message?.error(`${questionPrefix}未选择题型`)
          return false
        }
        if (!question.uiType) {
          window.$message?.error(`${questionPrefix}未选择UI类型`)
          return false
        }
        if (!question.templateId) {
          window.$message?.error(`${questionPrefix}未选择模板`)
          return false
        }
        if (!question.time) {
          window.$message?.error(`${questionPrefix}未设置答题时间`)
          return false
        }
        if (!question.scoreType) {
          window.$message?.error(`${questionPrefix}未设置分数规则`)
          return false
        }
        if (!question.title) {
          window.$message?.error(`${questionPrefix}未填写标题`)
          return false
        }
        if (question.score === null || question.score === undefined) {
          window.$message?.error(`${questionPrefix}未设置分数`)
          return false
        }
      }
    }
    return true
  }

  function reset() {
    // 默认重置为1个轮次，10个题目
    props.modelValue.rounds = []
    addRound()
  }

  return {
    getRoundScore,
    getRoundTime,
    totalStats,
    addRound,
    removeRound,
    addQuestion,
    removeQuestion,
    validate,
    reset,
  }
}