import { useState, useEffect } from 'react'
import { Row, Col, Card, Avatar, Tooltip, Button } from 'antd'
import {
  BarChartOutlined,
  EyeOutlined,
  CalendarOutlined,
  FireOutlined,
  PictureOutlined,
} from '@ant-design/icons'
import useAuthStore from '../../stores/authStore'
import { listEpisodes } from '../../services/episodeService'
import { listTargets } from '../../services/yearlyTargetService'
import './Dashboard.css'

/**
 * 收视份额颜色判定（极易写反，禁止凭直觉）：
 *   audience_share > stretch_target → 🔴 红（优秀）
 *   base_target ≤ audience_share ≤ stretch_target → 🔵 蓝（达标）
 *   audience_share < base_target → 🟢 绿（待提升）
 * 判色取该期 air_date 所属年份的 yearly_targets 行（不是当前年）。
 */
function getShareColor(share, targets, airYear) {
  // 强制转数值，避免后端返回字符串导致数值比较失败
  const n = Number(share)
  const target = targets.find(t => Number(t.year) === Number(airYear))
  if (!target) return '#999'
  if (isNaN(n)) return '#999'
  const stretch = Number(target.stretch_target)
  const base = Number(target.base_target)
  if (n > stretch) return '#c0584f' // 红=超过摸高目标（优秀）
  if (n >= base) return '#5b8db8'   // 蓝=未达摸高目标（达标）
  return '#7aa874'                   // 绿=未达基础目标（待提升）
}

function getBarHeight(share) {
  return Math.round((share / 1.0) * 180)
}

function getShortTitle(title) {
  return title.length > 12 ? title.slice(0, 12) + '...' : title
}

function Dashboard() {
  const { user } = useAuthStore()
  const [episodes, setEpisodes] = useState([])
  const [targets, setTargets] = useState([])
  const [loading, setLoading] = useState(true)

  useEffect(() => {
    Promise.all([
      listEpisodes(9),
      listTargets(),
    ]).then(([epData, tgtData]) => {
      // 按 air_date 倒序取前 9
      const sorted = (epData || []).sort((a, b) => new Date(b.air_date) - new Date(a.air_date)).slice(0, 9)
      setEpisodes(sorted)
      setTargets(tgtData || [])
      setLoading(false)
    }).catch(() => {
      setLoading(false)
    })
  }, [])

  // 显示最近有份额数据的期次（最多9个，不够用真实数据补位）
  const hasShare = episodes.filter(e => e.audience_share != null)
  const displayEpisodes = hasShare.length >= 5 ? hasShare.slice(0, 9) : episodes.slice(0, Math.max(9, hasShare.length || 5))

  const bestEpisode = [...displayEpisodes].filter(e => e.audience_share != null).sort((a, b) => b.audience_share - a.audience_share)[0]

  const showChangeCoverBtn = user?.role === 'zhipianren' || user?.role === 'zebian'

  return (
    <div className="dashboard">
      {/* 顶部 Banner */}
      <div className="dashboard-banner">
        <div className="banner-text">
          <h2>本月收视最佳</h2>
          {bestEpisode ? (
            <p>
              第 {bestEpisode.episode_number} 期 {bestEpisode.program_name} ·
              收视份额 {bestEpisode.audience_share}
            </p>
          ) : (
            <p>暂无收视数据</p>
          )}
        </div>
        {/* 题图渐变占位 */}
        <div className="banner-image-placeholder">
          <div className="banner-placeholder-gradient" />
          {showChangeCoverBtn && (
            <Button
              size="small"
              icon={<PictureOutlined />}
              disabled
              className="change-cover-btn"
            >
              更换题图
            </Button>
          )}
          <span className="placeholder-label">敬请期待</span>
        </div>
      </div>

      {/* KPI Cards */}
      <Row gutter={16} className="kpi-row">
        <Col span={8}>
          <Card className="kpi-card">
            <div className="kpi-icon" style={{ background: '#e8f5e9' }}>
              <EyeOutlined style={{ color: '#6b8e6b', fontSize: 24 }} />
            </div>
            <div className="kpi-info">
              <span className="kpi-value">{displayEpisodes.filter(e => e.audience_share).length || '--'}</span>
              <span className="kpi-label">近 9 期已录</span>
            </div>
          </Card>
        </Col>
        <Col span={8}>
          <Card className="kpi-card">
            <div className="kpi-icon" style={{ background: '#fff3e0' }}>
              <FireOutlined style={{ color: '#ff9800', fontSize: 24 }} />
            </div>
            <div className="kpi-info">
              <span className="kpi-value">
                {bestEpisode ? (bestEpisode.audience_share * 100).toFixed(1) + '%' : '--'}
              </span>
              <span className="kpi-label">最佳收视份额</span>
            </div>
          </Card>
        </Col>
        <Col span={8}>
          <Card className="kpi-card">
            <div className="kpi-icon" style={{ background: '#e3f2fd' }}>
              <CalendarOutlined style={{ color: '#2196f3', fontSize: 24 }} />
            </div>
            <div className="kpi-info">
              <span className="kpi-value">{targets.length || '--'}</span>
              <span className="kpi-label">年度目标条数</span>
            </div>
          </Card>
        </Col>
      </Row>

      {/* 三卡片区域 */}
      <Row gutter={16} className="cards-row">
        {/* 热点雷达 */}
        <Col span={8}>
          <Card className="content-card" title="热点雷达">
            <div className="placeholder-text">
              <BarChartOutlined style={{ fontSize: 32, color: '#ccc', marginBottom: 8 }} />
              <p>热点雷达 · Phase 4c</p>
              <small>编导个人首页核心功能，Phase 4c 实施</small>
            </div>
          </Card>
        </Col>

        {/* 近 9 期收视柱图 */}
        <Col span={8}>
          <Card className="content-card" title="近 9 期收视" loading={loading}>
            <div className="chart-container">
              <div className="bars-wrapper">
                {displayEpisodes.map((ep) => {
                  const airYear = new Date(ep.air_date).getFullYear()
                  const color = ep.audience_share != null
                    ? getShareColor(ep.audience_share, targets, airYear)
                    : '#ccc'
                  return (
                    <div key={ep.id} className="bar-item">
                      <Tooltip title={`${ep.program_name} · ${ep.audience_share ?? '无数据'}`}>
                        <div
                          className="bar"
                          style={{
                            height: ep.audience_share != null ? getBarHeight(ep.audience_share) : 20,
                            backgroundColor: color,
                          }}
                        />
                      </Tooltip>
                      <div className="bar-label-top">{getShortTitle(ep.program_name)}</div>
                      <div className="bar-label-bottom">
                        <Avatar size={20} style={{ fontSize: 10 }}>
                          {(ep.editor_name_snapshot || '?')[0]}
                        </Avatar>
                        <span>{ep.editor_name_snapshot || '未知'}</span>
                      </div>
                    </div>
                  )
                })}
              </div>
              <div className="chart-legend">
                <span className="legend-item"><span className="dot" style={{ background: '#7aa874' }}></span>绿=未达基础目标（待提升）</span>
                <span className="legend-item"><span className="dot" style={{ background: '#5b8db8' }}></span>蓝=未达摸高目标（达标）</span>
                <span className="legend-item"><span className="dot" style={{ background: '#c0584f' }}></span>红=超过摸高目标（优秀）</span>
              </div>
            </div>
          </Card>
        </Col>

        {/* 排播计划 */}
        <Col span={8}>
          <Card className="content-card" title="未来排播计划">
            <div className="placeholder-text">
              <CalendarOutlined style={{ fontSize: 32, color: '#ccc', marginBottom: 8 }} />
              <p>排播计划 · Phase 4b</p>
              <small>甘特图排期使用 frappe-gantt 实现，Phase 4b 开发</small>
            </div>
          </Card>
        </Col>
      </Row>
    </div>
  )
}

export default Dashboard