import { View, Text, Button, Image, ScrollView, PageContainer } from '@tarojs/components'
import Taro, { useLoad, useDidShow } from '@tarojs/taro'
import { useState, useEffect } from 'react'
import { getCompetitionDetail, enrollCompetition, getMyCompetitionEnrollment, getProjects, getComments } from '../../api'
import MarkdownReader from '../../components/MarkdownReader'
import './detail.scss'

export default function CompetitionDetail() {
  const [detail, setDetail] = useState<any>(null)
  const [enrollment, setEnrollment] = useState<any>(null)
  const [projects, setProjects] = useState<any[]>([])
  const [myProject, setMyProject] = useState<any>(null)
  const [activeTab, setActiveTab] = useState(0)
  const [loading, setLoading] = useState(false)
  const [showComments, setShowComments] = useState(false)
  const [comments, setComments] = useState<any[]>([])

  useLoad((options) => {
    const { id } = options
    if (id) {
      fetchDetail(id)
      fetchEnrollment(id)
      fetchProjects(id)
    }
  })

  useDidShow(() => {
    // 每次显示页面时刷新一下我的项目信息（比如从编辑页返回）
    if (detail?.id) {
        fetchMyProject(detail.id)
    }
  })

  const fetchDetail = async (id) => {
    setLoading(true)
    try {
      const res = await getCompetitionDetail(id)
      setDetail(res)
      fetchMyProject(id)
    } catch (e) {
      Taro.showToast({ title: '加载详情失败', icon: 'none' })
    } finally {
      setLoading(false)
    }
  }

  const fetchMyProject = async (competitionId) => {
    try {
        // 获取当前用户的所有项目，然后筛选出当前比赛的
        // 或者直接调用 getProjects 并传入 contestant__user=me (如果后端支持)
        // 目前后端 ProjectViewSet 默认返回：所有submitted + 自己的draft/submitted
        // 所以我们直接调 getProjects({ competition: competitionId }) 然后在前端找自己的
        
        // 更好的方式：后端 ProjectViewSet 应该已经过滤了，返回列表中如果有一条是自己的，那就是自己的
        // 但这里我们还是显式地请求一下，或者在 fetchProjects 的结果里找
        
        const userInfo = Taro.getStorageSync('userInfo')
        if (!userInfo) return

        const res = await getProjects({ competition: competitionId })
        const list = res.results || res
        const myProj = list.find((p: any) => p.contestant_info?.nickname === userInfo.nickname) // 这是一个简化的判断，最好用 ID
        // 由于 API 返回的 contestant_info 没有 user_id，我们可能需要在 project 对象里加一个 is_mine 字段
        // 或者，我们可以依赖后端返回的 contestant.user.id 与当前 user.id 比对。
        // 但前端拿不到 contestant.user.id (ProjectSerializer 没返回)。
        
        // 既然我们之前做了一个 getMyEnrollments，我们可以通过 enrollment id 来匹配
        // 但这里为了简便，我们可以假设 getProjects 返回的数据里，如果 contestant_info 匹配当前用户昵称... 不太靠谱
        
        // 让我们修改 API 或者用另一种方式：
        // 直接请求 getProjects，带上一个特殊参数 mine=true ? 后端 ProjectViewSet 逻辑比较复杂
        
        // 让我们回顾一下 ProjectViewSet:
        // q |= Q(contestant__user=user)
        // 所以返回的列表里肯定包含我的项目。
        
        // 既然我们已经有 enrollment 信息，我们可以用 enrollment.id 来匹配 project.contestant
        if (enrollment) {
             const mine = list.find((p: any) => p.contestant === enrollment.id)
             setMyProject(mine)
        } else {
            // 如果 enrollment 还没加载完，先不管，等 enrollment 加载完再匹配?
            // 或者我们再次 fetchEnrollment 后再 fetchProjects
        }
        
    } catch (e) {
        console.error(e)
    }
  }

  const fetchEnrollment = async (id) => {
    try {
      const res = await getMyCompetitionEnrollment(id)
      setEnrollment(res)
      // 获取到 enrollment 后，去匹配 myProject
      if (projects.length > 0) {
          const mine = projects.find((p: any) => p.contestant === res.id)
          setMyProject(mine)
      } else {
          // 如果 projects 还没加载，重新加载一次 projects 或者等待 fetchProjects 完成
          // 其实 fetchProjects 也在运行，它完成后也会设置 projects
      }
    } catch (e) {
      // 没报名则无数据，忽略
    }
  }

  const fetchProjects = async (id) => {
    try {
      // 注意：这里我们去掉了 status='submitted'，因为我们要找自己的 draft
      const res = await getProjects({ competition: id })
      const list = res.results || res
      const allProjects = Array.isArray(list) ? list : []
      
      // 过滤出 submitted 的给列表显示
      const submittedProjects = allProjects.filter(p => p.status === 'submitted')
      setProjects(submittedProjects)
      
      // 尝试找自己的项目 (Draft or Submitted)
      // 需要 enrollment 信息
      // 这里暂时没法直接 setMyProject，因为 enrollment 可能还没回来
      // 我们在 useEffect 里监听 enrollment 和 projects 的变化来设置 myProject
    } catch (e) {
      console.error('Fetch projects failed', e)
    }
  }
  
  // 监听变化设置 myProject
  useEffect(() => {
      if (enrollment && projects.length >= 0) { // projects could be empty
          // 重新获取一次所有项目以包含 draft? 
          // 上面的 fetchProjects 已经把 submitted 过滤给 setProjects 了。
          // 所以我们需要在 fetchProjects 里就把 allProjects 存下来？或者单独存 myProject
          
          // 让我们重构 fetchProjects，专门获取一次“我的项目”
          fetchMySpecificProject(detail?.id, enrollment.id)
      }
  }, [enrollment])

  const fetchMySpecificProject = async (compId, enrollId) => {
      if (!compId || !enrollId) return
      try {
          const res = await getProjects({ competition: compId })
          const list = res.results || res
          const mine = list.find((p: any) => p.contestant === enrollId)
          setMyProject(mine)
      } catch (e) {}
  }

  const fetchComments = async (projectId) => {
    Taro.showLoading({ title: '加载中' })
    try {
        const res = await getComments({ project: projectId })
        const list = res.results || res.data || res || []
        setComments(Array.isArray(list) ? list : [])
        setShowComments(true)
    } catch (e) {
        Taro.showToast({ title: '获取评语失败', icon: 'none' })
    } finally {
        Taro.hideLoading()
    }
  }

  const handleEnroll = async () => {
    if (!detail) return
    try {
      await enrollCompetition(detail.id, { role: 'contestant' })
      Taro.showToast({ title: '报名成功', icon: 'success' })
      fetchEnrollment(detail.id)
    } catch (e) {
      Taro.showToast({ title: e.message || '报名失败', icon: 'none' })
    }
  }

  const getStatusText = (status) => {
    const map = {
      'registration': '报名中',
      'submission': '作品提交中',
      'judging': '评审中',
      'ended': '已结束',
    }
    return map[status] || status
  }

  if (loading || !detail) return <View className='loading'>加载中...</View>

  return (
    <ScrollView scrollY className='comp-detail'>
      <Image 
        className='banner' 
        mode='aspectFill' 
        src={detail.display_cover_image || 'https://via.placeholder.com/400x200'} 
      />
      
      <View className='content'>
        <View className='header'>
          <Text className='title'>{detail.title}</Text>
          <Text className={`status ${detail.status}`}>{getStatusText(detail.status)}</Text>
        </View>
        
        <View className='tabs'>
          {['详情', '参赛项目', '排行榜'].map((tab, index) => (
            <View 
              key={index} 
              className={`tab-item ${activeTab === index ? 'active' : ''}`}
              onClick={() => setActiveTab(index)}
            >
              {tab}
            </View>
          ))}
        </View>

        {activeTab === 0 && (
          <>
            <View className='section'>
              <Text className='section-title'>简介</Text>
              <MarkdownReader content={detail.description} />
            </View>

            <View className='section'>
              <Text className='section-title'>规则</Text>
              <MarkdownReader content={detail.rule_description} />
            </View>

            <View className='section'>
              <Text className='section-title'>参赛条件</Text>
              <MarkdownReader content={detail.condition_description} />
            </View>
          </>
        )}

        {activeTab === 1 && (
          <View className='project-list'>
            {projects.map(project => (
              <View className='project-card' key={project.id}>
                <Image 
                  className='cover' 
                  mode='aspectFill' 
                  src={project.display_cover_image || 'https://via.placeholder.com/120x90'} 
                />
                <View className='info'>
                  <Text className='title'>{project.title}</Text>
                  <View className='author'>
                    <View className='user'>
                      <Image className='avatar' src={project.contestant_info?.avatar_url || ''} />
                      <Text>{project.contestant_info?.nickname || '参赛者'}</Text>
                    </View>
                    {project.final_score > 0 && <Text className='score'>{project.final_score}分</Text>}
                  </View>
                  <Button size='mini' style={{ marginTop: '8px', fontSize: '12px', background: 'transparent', color: '#666', border: '1px solid #ddd' }} onClick={(e) => {
                    e.stopPropagation()
                    fetchComments(project.id)
                  }}>查看评语</Button>
                </View>
              </View>
            ))}
            {projects.length === 0 && <View className='empty'>暂无参赛项目</View>}
          </View>
        )}

        {activeTab === 2 && (
          <View className='ranking-list'>
            {projects
              .filter(p => p.final_score > 0)
              .sort((a, b) => b.final_score - a.final_score)
              .map((project, index) => (
              <View className='rank-item' key={project.id}>
                <Text className={`rank-num top${index + 1}`}>{index + 1}</Text>
                <View className='info'>
                  <Image className='avatar' src={project.contestant_info?.avatar_url || ''} />
                  <View className='detail'>
                     <Text className='nickname'>{project.contestant_info?.nickname || '参赛者'}</Text>
                     <Text className='project-title'>{project.title}</Text>
                  </View>
                </View>
                <Text className='score'>{project.final_score}</Text>
              </View>
            ))}
            {projects.filter(p => p.final_score > 0).length === 0 && <View className='empty'>暂无排名数据</View>}
          </View>
        )}
      </View>

      <View className='footer-action'>
        {enrollment ? (
          myProject ? (
              <View style={{ display: 'flex', width: '100%', gap: '10px' }}>
                <Button 
                    className='btn enrolled'
                    style={{ flex: 1 }}
                    onClick={() => Taro.navigateTo({ url: `/pages/competition/project?id=${myProject.id}` })}
                >
                    我的作品 ({myProject.status === 'submitted' ? '已提交' : '草稿'})
                </Button>
                <Button 
                    className='btn'
                    style={{ width: '80px', background: '#fff', color: '#333', border: '1px solid #ddd', fontSize: '12px', padding: 0, display: 'flex', alignItems: 'center', justifyContent: 'center' }}
                    onClick={() => fetchComments(myProject.id)}
                >
                    评语
                </Button>
              </View>
          ) : (
            enrollment.status === 'approved' ? (
              <Button 
                className='btn enrolled'
                onClick={() => Taro.navigateTo({ url: `/pages/competition/project?competitionId=${detail.id}` })}
              >
                立即提交作品
              </Button>
            ) : (
              <Button disabled className='btn enrolled'>
                报名审核中
              </Button>
            )
          )
        ) : (
          <Button 
            className='btn enroll' 
            onClick={handleEnroll} 
            disabled={detail.status !== 'registration'}
          >
            {detail.status === 'registration' ? '立即报名' : '报名未开始/已结束'}
          </Button>
        )}
      </View>

      <PageContainer show={showComments} onClickOverlay={() => setShowComments(false)} position='bottom' round>
        <View className='comments-container' style={{ padding: '20px', maxHeight: '60vh', background: '#fff', borderTopLeftRadius: '16px', borderTopRightRadius: '16px' }}>
            <Text style={{ fontSize: '18px', fontWeight: 'bold', marginBottom: '16px', display: 'block', textAlign: 'center' }}>评委评语</Text>
            <ScrollView scrollY style={{ height: '300px' }}>
                {comments.length > 0 ? comments.map((c: any) => (
                    <View key={c.id} style={{ marginBottom: '16px', borderBottom: '1px solid #eee', paddingBottom: '8px' }}>
                        <View style={{ display: 'flex', justifyContent: 'space-between', marginBottom: '4px' }}>
                            <Text style={{ fontWeight: 'bold', fontSize: '14px' }}>{c.judge_name || '评委'}</Text>
                            <Text style={{ fontSize: '12px', color: '#999' }}>{c.created_at?.substring(0, 16)}</Text>
                        </View>
                        <Text style={{ display: 'block', color: '#333', fontSize: '14px', lineHeight: '1.5' }}>{c.content}</Text>
                    </View>
                )) : <Text style={{ color: '#999', textAlign: 'center', display: 'block', marginTop: '20px' }}>暂无评语</Text>}
            </ScrollView>
            <Button onClick={() => setShowComments(false)} style={{ marginTop: '16px' }}>关闭</Button>
        </View>
      </PageContainer>
    </ScrollView>
  )
}