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(false)
  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 API_BASE = localStorage.getItem('API_BASE') || ''

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

  useEffect(() => { fetchTodayStats(); fetchPosts(1, '') }, [])

  const fetchTodayStats = async () => {
    try {
      const res = await fetch(API_BASE + '/api/yichens/stats/today')
      setTodayStats(await res.json())
    } catch(e) { console.error(e) }
  }

  const fetchTodayCategory = async () => {
    try {
      const res = await fetch(API_BASE + '/api/yichens/stats/today-category')
      setTodayCategory(await res.json())
    } catch(e) { console.error(e) }
  }

  const fetchPosts = async (p, cat) => {
    setLoading(true)
    const currentPage = p !== undefined ? p : page
    const currentCat = cat !== undefined ? cat : categoryFilter
    
    let url = API_BASE + '/api/yichens/posts?limit=390&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 {
      const res = await fetch(url)
      let data = await res.json() || []
      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'))
        }
      }
      // 搜索关键词过滤 - 强匹配（完全包含）
      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 { setPosts([]) }
    setLoading(false)
  }

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

  // 搜索关键词变化时重新获取数据
  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>
  )

  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={{ display: 'flex', gap: 6, overflowX: 'auto', paddingBottom: 4 }}>
          {todayCategory.map(cat => (
            <span key={cat.category} style={{ padding: '4px 10px', background: 'rgba(59,130,246,0.2)', borderRadius: 16, color: '#93c5fd', fontSize: 11, whiteSpace: 'nowrap' }}>
              {cat.category} ({cat.count})
            </span>
          ))}
        </div>
      </div>

      {/* 搜索框 */}
      <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.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>

          {/* 分页按钮移到页面底部 */}
          <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 / 390)} 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 >= 390 ? (
                <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>
  )
}