import React, { useState, useEffect } from 'react'

export default function YichensBoard() {
  const [todayStats, setTodayStats] = useState({ total: 0, deals: 0, wants: 0, others: 0 })
  const [todayCategory, setTodayCategory] = useState([])
  const [posts, setPosts] = useState([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState(null)
  const [expandedPosts, setExpandedPosts] = useState({})
  const [postTypeFilter, setPostTypeFilter] = useState('all')
  const [categoryFilter, setCategoryFilter] = useState('')
  const [page, setPage] = useState(1)
  const [totalPosts, setTotalPosts] = useState(0)
  const [searchKeyword, setSearchKeyword] = useState('')

  const today = new Date()
  const dateStr = today.getFullYear() + '/' + (today.getMonth() + 1) + '/' + today.getDate()

  useEffect(() => { 
    console.log('YichensBoard: 开始加载数据')
    fetchTodayStats()
  }, [])

  const fetchTodayStats = async () => {
    try {
      console.log('YichensBoard: 请求 /api/yichens/stats/today')
      const res = await fetch('/api/yichens/stats/today')
      if (!res.ok) throw new Error('stats API error: ' + res.status)
      const data = await res.json()
      console.log('YichensBoard: stats data', data)
      setTodayStats(data)
    } catch(e) { 
      console.error('YichensBoard: fetchTodayStats error', e)
      setError(e.message)
    }
  }

  const fetchPosts = async (p, cat) => {
    setLoading(true)
    setError(null)
    const currentPage = p !== undefined ? p : page
    const currentCat = cat !== undefined ? cat : categoryFilter
    
    let url = '/api/yichens/posts?limit=50&offset=' + ((currentPage - 1) * 390)
    if (postTypeFilter === 'deal') url += '&post_type=deal'
    else if (postTypeFilter === 'want') url += '&post_type=want'
    else if (postTypeFilter === 'other') url += '&post_type=normal'
    
    try {
      console.log('YichensBoard: 请求 posts', url)
      const res = await fetch(url)
      if (!res.ok) throw new Error('posts API error: ' + res.status)
      let data = await res.json() || []
      console.log('YichensBoard: posts data count', data.length)
      if (currentCat) {
        if (currentCat === '龙') {
          data = data.filter(p => p.category && (p.category.includes('龙') || p.category.includes('纪念钞')))
        } else if (currentCat === '蛇') {
          data = data.filter(p => p.category && p.category.includes('蛇'))
        } else if (currentCat === '马') {
          data = data.filter(p => p.category && p.category.includes('马'))
        } else if (currentCat === '其他') {
          data = data.filter(p => p.category && !p.category.includes('龙') && !p.category.includes('纪念钞') && !p.category.includes('蛇') && !p.category.includes('马'))
        }
      }
      if (searchKeyword) {
        const kw = searchKeyword.trim()
        if (kw) {
          data = data.filter(p => 
            (p.title && p.title.includes(kw)) ||
            (p.content && p.content.includes(kw)) ||
            (p.category && p.category.includes(kw)) ||
            (p.contact && p.contact.includes(kw))
          )
        }
      }
      setPosts(data)
      setTotalPosts(todayStats.total || 0)
    } catch(e) { 
      console.error('YichensBoard: fetchPosts error', e)
      setError(e.message)
      setPosts([]) 
    }
    setLoading(false)
  }

  useEffect(() => { 
    if (todayStats.total > 0) {
      // fetchTodayCategory() 
      fetchPosts(1, '')
    }
  }, [todayStats])

  useEffect(() => {
    setPage(1)
    fetchPosts(1, '')
  }, [searchKeyword])

  const togglePost = id => setExpandedPosts(p => ({ ...p, [id]: !p[id] }))

  const StatCard = ({ label, value, color, onClick }) => (
    <div onClick={onClick} style={{ 
      background: 'linear-gradient(145deg, #1f2937 0%, #111827 100%)', 
      borderRadius: 12, padding: '12px 8px', border: '1px solid #374151',
      cursor: onClick ? 'pointer' : 'default',
      textAlign: 'center'
    }}>
      <div style={{ color: '#9ca3af', fontSize: 11, marginBottom: 4 }}>{label}</div>
      <div style={{ color: color || '#fff', fontSize: 20, fontWeight: 'bold' }}>{value}</div>
    </div>
  )

  if (error) {
    return (
      <div style={{ padding: 20, textAlign: 'center', color: '#ef4444' }}>
        <div>加载失败: {error}</div>
        <button onClick={() => { setError(null); fetchTodayStats(); }} style={{ marginTop: 10, padding: '8px 16px', background: '#3b82f6', color: '#fff', border: 'none', borderRadius: 6, cursor: 'pointer' }}>
          重试
        </button>
      </div>
    )
  }

  return (
    <div style={{ padding: '0' }}>
      <div style={{ marginBottom: 16 }}>
        <div style={{ color: '#f9fafb', fontSize: 14, fontWeight: 600, marginBottom: 10 }}>
          📈 连体钞/纪念钞 <span style={{ color: '#9ca3af', fontWeight: 400 }}>{dateStr}</span>
        </div>
        <div style={{ display: 'grid', gridTemplateColumns: 'repeat(4, 1fr)', gap: 8 }}>
          <StatCard label='全部' value={todayStats.total} color='#3b82f6' onClick={() => { setPostTypeFilter('all'); setCategoryFilter(''); setPage(1); fetchPosts(1, '') }} />
          <StatCard label='出售' value={todayStats.deals} color='#10b981' onClick={() => { setPostTypeFilter('deal'); setCategoryFilter(''); setPage(1); fetchPosts(1, '') }} />
          <StatCard label='求购' value={todayStats.wants} color='#f59e0b' onClick={() => { setPostTypeFilter('want'); setCategoryFilter(''); setPage(1); fetchPosts(1, '') }} />
          <StatCard label='其他' value={todayStats.others || 0} color='#8b5cf6' onClick={() => { setPostTypeFilter('other'); setCategoryFilter(''); setPage(1); fetchPosts(1, '') }} />
        </div>
      </div>

      <div style={{ background: 'linear-gradient(145deg, #1f2937 0%, #111827 100%)', borderRadius: 12, padding: 12, marginBottom: 20, border: '1px solid #374151' }}>
        <div style={{ color: '#f9fafb', fontSize: 14, fontWeight: 600, marginBottom: 8 }}>📊 今日分类统计</div>
        <div style={{ color: '#9ca3af', fontSize: 12 }}>龙: {todayStats.dragons || 0} | 马: {todayStats.horses || 0} | 蛇: {todayStats.snakes || 0} | 天马: {todayStats.tianma || 0}</div>
      </div>

      <div style={{ marginBottom: 12 }}>
        <div style={{ display: 'flex', gap: 8 }}>
          <input 
            type="text" 
            placeholder="搜索标题、内容、分类..." 
            value={searchKeyword}
            onChange={(e) => { setSearchKeyword(e.target.value); setPage(1); fetchPosts(1, '') }}
            style={{ flex: 1, padding: '10px 14px', borderRadius: 8, border: '1px solid #374151', background: '#1f2937', color: '#fff', fontSize: 13, outline: 'none' }}
          />
          <button 
            onClick={() => { setSearchKeyword(''); setPage(1); fetchPosts(1, '') }}
            style={{ padding: '10px 16px', borderRadius: 8, border: 'none', background: '#4b5563', color: '#fff', cursor: 'pointer', fontSize: 13 }}>
            清空
          </button>
        </div>
        {searchKeyword && <div style={{ color: '#9ca3af', fontSize: 12, marginTop: 6 }}>搜索: "{searchKeyword}"，找到 {posts.length} 条结果</div>}
      </div>

      <div style={{ display: 'flex', gap: 8, marginBottom: 12 }}>
        {[{key:'all',label:'全部'},{key:'deal',label:'出售'},{key:'want',label:'求购'},{key:'other',label:'其他'}].map(k => (
          <button key={k.key} onClick={() => { setPostTypeFilter(k.key==='other'?'other':k.key); setCategoryFilter(''); setPage(1); fetchPosts(1, '') }}
            style={{ padding: '8px 16px', borderRadius: 8, border: 'none',
              background: postTypeFilter===k.key ? 'linear-gradient(135deg, #3b82f6 0%, #2563eb 100%)' : '#374151', color: '#fff', cursor: 'pointer', fontSize: 13 }}>
            {k.label}
          </button>
        ))}
      </div>

      <div style={{ display: 'flex', gap: 8, marginBottom: 16 }}>
        {[{key:'',label:'全部'},{key:'龙',label:'龙钞'},{key:'蛇',label:'蛇钞'},{key:'马',label:'马钞'},{key:'其他',label:'其他'}].map(k => (
          <button key={k.key} onClick={() => { setCategoryFilter(k.key); setPage(1); fetchPosts(1, k.key) }}
            style={{ padding: '8px 16px', borderRadius: 8, border: 'none',
              background: categoryFilter===k.key ? 'linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%)' : '#374151', color: '#fff', cursor: 'pointer', fontSize: 13 }}>
            {k.label}
          </button>
        ))}
      </div>

      {loading ? <div style={{textAlign:'center',color:'#9ca3af',padding:40}}>加载中...</div> : (
        <div>
          <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
            {posts.length === 0 ? (
              <div style={{ textAlign: 'center', color: '#9ca3af', padding: 40 }}>暂无帖子数据</div>
            ) : (
              posts.map(post => (
                <div key={post.post_id} style={{ background: 'linear-gradient(145deg, #1f2937 0%, #111827 100%)', borderRadius: 12, padding: 16, border: '1px solid #374151' }}>
                  <div onClick={() => togglePost(post.post_id)} style={{ cursor: 'pointer' }}>
                    <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: 8 }}>
                      <span style={{ color: '#fff', fontSize: 15, fontWeight: 500, flex: 1 }}>{post.title||'无标题'}</span>
                      <div style={{ display: 'flex', gap: 4 }}>
                        <span style={{ color: post.post_type==='deal'?'#10b981':post.post_type==='want'?'#f59e0b':post.post_type==='normal'?'#8b5cf6':'#9ca3af', fontSize: 12 }}>
                          {post.post_type==='deal'?'出售':post.post_type==='want'?'求购':post.post_type==='normal'?'其他':'普通'}
                        </span>
                        <span style={{ padding: '2px 8px', borderRadius: 4, fontSize: 11, background: post.category?.includes('龙') ? 'rgba(251,191,36,0.4)' : post.category?.includes('马') ? 'rgba(180,83,9,0.4)' : post.category?.includes('蛇') ? 'rgba(249,168,212,0.4)' : 'rgba(139,92,246,0.4)', color: post.category?.includes('龙') ? '#fde047' : post.category?.includes('马') ? '#d97706' : post.category?.includes('蛇') ? '#fbcfe8' : '#c4b5fd' }}>
                          {post.category || '-'}
                        </span>
                      </div>
                    </div>
                    <div style={{ display: 'flex', justifyContent: 'space-between', color: '#9ca3af', fontSize: 12 }}>
                      <span>{post.author_username||'未知'}</span>
                      <span>{post.post_time?.substring(0,16)||''}</span>
                    </div>
                  </div>
                  {expandedPosts[post.post_id] && post.content && (
                    <div style={{ marginTop: 12, paddingTop: 12, borderTop: '1px solid #374151' }}>
                      <div style={{ color: '#e2e8f0', fontSize: 13, lineHeight: 1.6, whiteSpace: 'pre-wrap', wordBreak: 'break-word', maxHeight: 300, overflowY: 'auto' }}>
                        {post.content}
                      </div>
                      {post.url && <a href={post.url} target='_blank' rel='noopener noreferrer' style={{ display:'inline-block', marginTop:12, padding:'8px 16px', background:'rgba(59,130,246,0.2)', borderRadius:8, color:'#60a5fa', textDecoration:'none', fontSize:13 }}>查看原帖</a>}
                    </div>
                  )}
                </div>
              ))
            )}
          </div>

          <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', padding: '12px 16px', background: '#1e293b', borderRadius: 12, marginTop: 16 }}>
            <div style={{ color: '#9ca3af', fontSize: 12 }}>
              共 {totalPosts} 条帖子，{Math.ceil(totalPosts / 50)} 页，当前第 {page} 页
            </div>
            <div style={{ display: 'flex', gap: 8 }}>
              {page > 1 ? (
                <button onClick={() => { const newPage = page - 1; setPage(newPage); fetchPosts(newPage, categoryFilter) }} style={{ padding: '6px 12px', borderRadius: 6, border: 'none', background: '#3b82f6', color: '#fff', cursor: 'pointer', fontSize: 12 }}>上一页</button>
              ) : (
                <span style={{ padding: '6px 12px', borderRadius: 6, background: '#374151', color: '#6b7280', fontSize: 12 }}>上一页</span>
              )}
              {posts.length >= 50 ? (
                <button onClick={() => { const newPage = page + 1; setPage(newPage); fetchPosts(newPage, categoryFilter) }} style={{ padding: '6px 12px', borderRadius: 6, border: 'none', background: '#3b82f6', color: '#fff', cursor: 'pointer', fontSize: 12 }}>下一页</button>
              ) : (
                <span style={{ padding: '6px 12px', borderRadius: 6, background: '#374151', color: '#6b7280', fontSize: 12 }}>下一页</span>
              )}
            </div>
          </div>
        </div>
      )}
    </div>
  )
}
