import React, { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import { adminAPI } from '@/api';

const SVGIcon: React.FC<{ children: React.ReactNode; size?: number }> = ({ children, size = 20 }) => (
  <svg width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" strokeLinejoin="round">
    {children}
  </svg>
);

interface DashboardStats {
  total_users: number;
  active_users: number;
  total_models: number;
  enabled_models: number;
  total_conversations: number;
  active_conversations: number;
  total_knowledge_bases: number;
  total_documents: number;
  today_orders: number;
  today_tokens: number;
  week_tokens: number;
  total_tokens: number;
  today_conversations: number;
  server_time: string;
}

interface DailyStat {
  date: string;
  tokens: number;
}

const quickEntries = [
  { path: '/admin/models', label: '大模型库', desc: '管理AI模型与供应商', icon: <SVGIcon><path d="M12 2L2 7l10 5 10-5-10-5z"/><path d="M2 17l10 5 10-5"/><path d="M2 12l10 5 10-5"/></SVGIcon> },
  { path: '/admin/settings', label: '网站设置', desc: '品牌、邮件、短信配置', icon: <SVGIcon><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1-2.83 2.83l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83-2.83l.06-.06A1.65 1.65 0 0 0 4.68 15a1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 2.83-2.83l.06.06A1.65 1.65 0 0 0 9 4.68a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 2.83l-.06.06A1.65 1.65 0 0 0 19.4 9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1z"/></SVGIcon> },
  { path: '/admin/payment', label: '支付配置', desc: '微信、支付宝渠道配置', icon: <SVGIcon><rect x="2" y="5" width="20" height="14" rx="2"/><line x1="2" y1="10" x2="22" y2="10"/></SVGIcon> },
  { path: '/admin/services', label: '增值服务', desc: '服务管理与定制订单', icon: <SVGIcon><polyline points="16 3 21 3 21 8"/><line x1="4" y1="20" x2="21" y2="3"/><polyline points="21 16 21 21 16 21"/><line x1="15" y1="15" x2="21" y2="21"/><line x1="4" y1="4" x2="9" y2="9"/></SVGIcon> },
  { path: '/admin/membership', label: '会员体系', desc: '订阅计划与自动化规则', icon: <SVGIcon><path d="M20.59 13.41l-7.17 7.17a2 2 0 0 1-2.83 0L2 12V2h10l8.59 8.59a2 2 0 0 1 0 2.82z"/><line x1="7" y1="7" x2="7.01" y2="7"/></SVGIcon> },
  { path: '/admin/market', label: '应用市场', desc: '应用审核与优惠券管理', icon: <SVGIcon><rect x="3" y="3" width="7" height="7" rx="1.2"/><rect x="14" y="3" width="7" height="7" rx="1.2"/><rect x="3" y="14" width="7" height="7" rx="1.2"/><rect x="14" y="14" width="7" height="7" rx="1.2"/></SVGIcon> },
  { path: '/admin/logs', label: '日志风控', desc: '操作/调用/付费日志与风控', icon: <SVGIcon><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"/><polyline points="14 2 14 8 20 8"/><line x1="16" y1="13" x2="8" y2="13"/><line x1="16" y1="17" x2="8" y2="17"/></SVGIcon> },
];

// SVG Bar Chart Component
const BarChart: React.FC<{ data: DailyStat[] }> = ({ data }) => {
  if (!data || data.length === 0) return <div style={{ color: '#6B7280', textAlign: 'center', padding: 40 }}>暂无数据</div>;

  const maxVal = Math.max(...data.map(d => d.tokens), 1);
  const w = 600, h = 200, padLeft = 55, padRight = 10, padTop = 10, padBottom = 25;
  const barAreaW = w - padLeft - padRight;
  const barAreaH = h - padTop - padBottom;
  const barGap = 2;
  const barW = Math.max(2, (barAreaW / data.length) - barGap);

  // Y axis ticks
  const yTicks = [0, Math.round(maxVal * 0.25), Math.round(maxVal * 0.5), Math.round(maxVal * 0.75), maxVal];

  const formatK = (n: number) => n >= 10000 ? (n / 1000).toFixed(0) + 'k' : String(n);
  const formatDate = (d: string) => {
    const parts = d.split('-');
    return parts.length >= 2 ? `${parts[1]}/${parts[2]}` : d;
  };

  return (
    <svg width={w} height={h} viewBox={`0 0 ${w} ${h}`} style={{ width: '100%', height: 'auto', maxWidth: 600 }}>
      {/* Grid lines */}
      {yTicks.map((tick, i) => {
        const y = padTop + barAreaH - (tick / maxVal) * barAreaH;
        return (
          <g key={i}>
            <line x1={padLeft} y1={y} x2={w - padRight} y2={y} stroke="rgba(0,0,0,0.06)" strokeWidth="0.5" />
            <text x={padLeft - 8} y={y + 4} textAnchor="end" fontSize="10" fill="#6B7280">{formatK(tick)}</text>
          </g>
        );
      })}
      {/* Bars */}
      {data.map((d, i) => {
        const barH = (d.tokens / maxVal) * barAreaH;
        const x = padLeft + i * (barAreaW / data.length);
        const y = padTop + barAreaH - barH;
        return (
          <g key={i}>
            <rect x={x + barGap / 2} y={y} width={barW} height={Math.max(barH, 1)} rx="2" fill="#6C63FF" opacity="0.85">
              <title>{`${d.date}: ${d.tokens.toLocaleString()} tokens`}</title>
            </rect>
            {/* X label - every 7th bar */}
            {i % Math.max(1, Math.floor(data.length / 8)) === 0 && (
              <text x={x + barW / 2} y={h - 6} textAnchor="middle" fontSize="9" fill="#6B7280">{formatDate(d.date)}</text>
            )}
          </g>
        );
      })}
    </svg>
  );
};

// Mini Donut for stat cards
const MiniDonut: React.FC<{ value: number; max: number; color: string }> = ({ value, max, color }) => {
  const pct = max > 0 ? Math.min(value / max, 1) : 0;
  const r = 16, c = 20, circumference = 2 * Math.PI * r;
  const dash = circumference * pct;
  return (
    <svg width={c * 2} height={c * 2} viewBox={`0 0 ${c * 2} ${c * 2}`}>
      <circle cx={c} cy={c} r={r} fill="none" stroke="rgba(0,0,0,0.06)" strokeWidth="3" />
      <circle cx={c} cy={c} r={r} fill="none" stroke={color} strokeWidth="3"
        strokeDasharray={`${dash} ${circumference - dash}`} strokeLinecap="round"
        transform={`rotate(-90 ${c} ${c})`} style={{ transition: 'stroke-dasharray 0.6s ease' }} />
      <text x={c} y={c + 4} textAnchor="middle" fontSize="9" fontWeight="600" fill={color}>
        {Math.round(pct * 100)}%
      </text>
    </svg>
  );
};

const Dashboard: React.FC = () => {
  const navigate = useNavigate();
  const [stats, setStats] = useState<DashboardStats>({
    total_users: 0, active_users: 0, total_models: 0, enabled_models: 0,
    total_conversations: 0, active_conversations: 0, total_knowledge_bases: 0, total_documents: 0,
    today_orders: 0, today_tokens: 0, week_tokens: 0, total_tokens: 0,
    today_conversations: 0, server_time: '',
  });
  const [dailyStats, setDailyStats] = useState<DailyStat[]>([]);
  const [operationLogs, setOperationLogs] = useState<any[]>([]);
  const [auditLogs, setAuditLogs] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const fetchData = async () => {
      setLoading(true);
      try {
        const [statsRes, dailyRes, logsRes, auditRes] = await Promise.all([
          adminAPI.getStats() as any,
          (adminAPI as any).getDailyStats?.(30) || Promise.resolve({ data: [] }),
          adminAPI.getRecentLogs() as any,
          adminAPI.getRecentAudit() as any,
        ]);
        // Stats: backend returns raw dict (no {code,data} wrapper) — use .data or the response itself
        const statsData = statsRes?.data || statsRes;
        if (statsData && typeof statsData === 'object') setStats(statsData);

        // Daily stats: backend returns {code, data: {days, data: [...]}} — access nested .data.data
        const dailyData = dailyRes?.data?.data || (Array.isArray(dailyRes?.data) ? dailyRes.data : []) || [];
        setDailyStats(Array.isArray(dailyData) ? dailyData : []);

        // Recent logs: backend returns raw list (no wrapper) — use the response directly if it's an array
        const logsData = Array.isArray(logsRes) ? logsRes : (Array.isArray(logsRes?.data) ? logsRes.data : []);
        setOperationLogs(logsData);

        // Recent audit: same as logs
        const auditData = Array.isArray(auditRes) ? auditRes : (Array.isArray(auditRes?.data) ? auditRes.data : []);
        setAuditLogs(auditData);
      } catch (err) {
        console.error('Dashboard数据加载失败:', err);
      } finally {
        setLoading(false);
      }
    };
    fetchData();
  }, []);

  const formatDate = (d: string) => {
    if (!d) return '-';
    const dt = new Date(d);
    if (isNaN(dt.getTime())) return d.slice(0, 19) || '-';
    return dt.toLocaleDateString('zh-CN', { month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit' });
  };

  const formatTokens = (n: number): string => {
    if (n >= 100000000) return (n / 100000000).toFixed(2) + '亿';
    if (n >= 10000) return (n / 10000).toFixed(1) + '万';
    return n.toLocaleString('en-US');
  };

  const statCardDefs = [
    { label: '总用户', value: stats.total_users, sub: `活跃 ${stats.active_users}`, color: '#6C63FF', bg: 'rgba(108,99,255,0.12)', subBg: 'rgba(108,99,255,0.08)',
      icon: <SVGIcon size={22}><path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/><circle cx="9" cy="7" r="4"/><path d="M23 21v-2a4 4 0 0 0-3-3.87"/><path d="M16 3.13a4 4 0 0 1 0 7.75"/></SVGIcon> },
    { label: 'AI模型', value: stats.total_models, sub: `启用 ${stats.enabled_models}`, color: '#219B5E', bg: 'rgba(33,155,94,0.12)', subBg: 'rgba(33,155,94,0.08)',
      icon: <SVGIcon size={22}><path d="M12 2L2 7l10 5 10-5-10-5z"/><path d="M2 17l10 5 10-5"/><path d="M2 12l10 5 10-5"/></SVGIcon> },
    { label: '对话数', value: stats.total_conversations, sub: `活跃 ${stats.active_conversations}`, color: '#E8922C', bg: 'rgba(232,146,44,0.12)', subBg: 'rgba(232,146,44,0.08)',
      icon: <SVGIcon size={22}><path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/></SVGIcon> },
    { label: '知识库', value: stats.total_knowledge_bases, sub: `文档 ${stats.total_documents}`, color: '#3B82F6', bg: 'rgba(59,130,246,0.12)', subBg: 'rgba(59,130,246,0.08)',
      icon: <SVGIcon size={22}><path d="M4 19.5A2.5 2.5 0 0 1 6.5 17H20"/><path d="M6.5 2H20v20H6.5A2.5 2.5 0 0 1 4 19.5v-15A2.5 2.5 0 0 1 6.5 2z"/></SVGIcon> },
    { label: '今日对话', value: stats.today_conversations, sub: `订单 ${stats.today_orders}`, color: '#8B5CF6', bg: 'rgba(139,92,246,0.12)', subBg: 'rgba(139,92,246,0.08)',
      icon: <SVGIcon size={22}><polyline points="22 12 18 12 15 21 9 3 6 12 2 12"/></SVGIcon> },
    { label: '今日Token', value: stats.today_tokens, sub: `本周 ${formatTokens(stats.week_tokens)}`, color: '#EC4899', bg: 'rgba(236,72,153,0.12)', subBg: 'rgba(236,72,153,0.08)', format: true,
      icon: <SVGIcon size={22}><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></SVGIcon> },
  ];

  if (loading) {
    return (
      <div style={{ animation: 'fadeIn var(--transition-normal)', padding: 'var(--space-2xl)', textAlign: 'center' }}>
        <div className="audit-spinner" />
        <span style={{ marginLeft: 'var(--space-md)', color: 'var(--color-text-tertiary)' }}>加载仪表盘数据...</span>
      </div>
    );
  }

  return (
    <div style={{ animation: 'fadeIn var(--transition-normal)' }}>
      <h1 className="admin-page-title">平台驾驶舱</h1>

      {/* Stats Cards Row */}
      <div className="admin-stats" style={{ display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: '16px', marginBottom: '24px' }}>
        {statCardDefs.map((s, i) => (
          <div key={i} className="admin-stat-card" style={{
            display: 'flex', alignItems: 'flex-start', gap: 'var(--space-lg)',
            padding: 'var(--space-lg) var(--space-xl)',
          }}>
            <div style={{
              width: 48, height: 48, borderRadius: 14,
              background: s.bg, color: s.color,
              display: 'flex', alignItems: 'center', justifyContent: 'center',
              flexShrink: 0,
            }}>
              {s.icon}
            </div>
            <div style={{ flex: 1, minWidth: 0 }}>
              <div className="admin-stat-label">{s.label}</div>
              <div className="admin-stat-value" style={{ fontSize: 'var(--text-xl)' }}>
                {s.format ? formatTokens(s.value as number) : (s.value as number).toLocaleString()}
              </div>
              <div style={{
                fontSize: 11, color: s.color, marginTop: 2,
                background: s.subBg || s.bg, padding: '1px 6px', borderRadius: 4,
                display: 'inline-block',
              }}>{s.sub}</div>
            </div>
          </div>
        ))}
      </div>

      {/* Charts Row */}
      <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fill, minmax(400px, 1fr))', gap: 'var(--space-xl)', marginBottom: 'var(--space-xl)' }}>
        {/* Token Trend Chart */}
        <div className="admin-card">
          <div className="admin-card-header">
            <h3 className="admin-card-title">
              <SVGIcon size={18}><polyline points="22 12 18 12 15 21 9 3 6 12 2 12"/></SVGIcon>
              {' '}Token消耗趋势（近30天）
            </h3>
          </div>
          <div style={{ padding: 'var(--space-lg)', display: 'flex', justifyContent: 'center' }}>
            <BarChart data={dailyStats} />
          </div>
        </div>

        {/* System Health */}
        <div className="admin-card">
          <div className="admin-card-header">
            <h3 className="admin-card-title">
              <SVGIcon size={18}><circle cx="12" cy="12" r="10"/><path d="M12 6v6l4 2"/></SVGIcon>
              {' '}平台概览
            </h3>
          </div>
          <div style={{ padding: 'var(--space-lg)' }}>
            {[
              { label: '累计Token消耗', value: formatTokens(stats.total_tokens), color: '#6C63FF', pct: 100 },
              { label: '模型利用率', value: `${stats.enabled_models}/${stats.total_models}`, color: '#219B5E', pct: stats.total_models > 0 ? stats.enabled_models / stats.total_models : 0 },
              { label: '用户活跃率', value: `${stats.active_users}/${stats.total_users}`, color: '#E8922C', pct: stats.total_users > 0 ? stats.active_users / stats.total_users : 0 },
              { label: '对话活跃率', value: `${stats.active_conversations}/${stats.total_conversations}`, color: '#3B82F6', pct: stats.total_conversations > 0 ? stats.active_conversations / stats.total_conversations : 0 },
            ].map((item, i) => (
              <div key={i} style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', padding: '10px 0', borderBottom: i < 3 ? '1px solid rgba(0,0,0,0.06)' : 'none' }}>
                <div style={{ display: 'flex', alignItems: 'center', gap: 10 }}>
                  <MiniDonut value={item.pct * 100} max={100} color={item.color} />
                  <span style={{ fontSize: 13, color: '#1A1F36' }}>{item.label}</span>
                </div>
                <span style={{ fontSize: 15, fontWeight: 700, color: item.color, fontFamily: 'var(--font-mono)' }}>{item.value}</span>
              </div>
            ))}
            <div style={{ marginTop: 12, fontSize: 11, color: '#6B7280', textAlign: 'center' }}>
              服务器时间: {stats.server_time ? new Date(stats.server_time).toLocaleString('zh-CN') : '-'}
            </div>
          </div>
        </div>
      </div>

      {/* Quick Actions */}
      <div style={{ marginBottom: 'var(--space-xl)' }}>
        <h3 style={{ fontSize: 15, fontWeight: 600, marginBottom: 12, color: '#1A1F36' }}>快捷入口</h3>
        <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fill, minmax(180px, 1fr))', gap: 'var(--space-md)' }}>
          {quickEntries.map((entry) => (
            <div
              key={entry.path}
              onClick={() => navigate(entry.path)}
              style={{
                background: '#FFFFFF', borderRadius: 'var(--radius-lg)', border: '1px solid rgba(0,0,0,0.08)',
                padding: 'var(--space-md) var(--space-lg)', cursor: 'pointer', transition: 'all 0.2s',
                display: 'flex', alignItems: 'center', gap: 'var(--space-md)',
                boxShadow: '0 1px 3px rgba(0,0,0,0.04)',
              }}
              onMouseEnter={(e) => {
                e.currentTarget.style.borderColor = '#6C63FF';
                e.currentTarget.style.boxShadow = '0 2px 8px rgba(108,99,255,0.15)';
                e.currentTarget.style.transform = 'translateY(-1px)';
              }}
              onMouseLeave={(e) => {
                e.currentTarget.style.borderColor = 'var(--color-border)';
                e.currentTarget.style.boxShadow = 'none';
                e.currentTarget.style.transform = 'none';
              }}
            >
              <div style={{ color: '#6C63FF', flexShrink: 0 }}>{entry.icon}</div>
              <div>
                <div style={{ fontSize: 13, fontWeight: 600, color: '#1A1F36' }}>{entry.label}</div>
                <div style={{ fontSize: 11, color: '#6B7280' }}>{entry.desc}</div>
              </div>
            </div>
          ))}
        </div>
      </div>

      {/* Recent Logs */}
      <div className="admin-card" style={{ marginBottom: 'var(--space-xl)' }}>
        <div className="admin-card-header">
          <h3 className="admin-card-title">最近操作日志</h3>
          <span style={{ fontSize: 12, color: '#6B7280' }}>最近10条</span>
        </div>
        <div style={{ overflowX: 'auto' }}>
          <table className="admin-table">
            <thead>
              <tr>
                <th>用户</th>
                <th>操作</th>
                <th>目标</th>
                <th>详情</th>
                <th>IP</th>
                <th>时间</th>
              </tr>
            </thead>
            <tbody>
              {operationLogs.length > 0 ? operationLogs.map(log => (
                <tr key={log.id}>
                  <td style={{ fontWeight: 500 }}>{log.username}</td>
                  <td><span className="admin-badge badge-info">{log.action}</span></td>
                  <td>{log.target}</td>
                  <td style={{ maxWidth: 200, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{log.detail}</td>
                  <td style={{ fontFamily: 'var(--font-mono)', fontSize: 'var(--text-xs)', color: 'var(--color-text-tertiary)' }}>{log.ip}</td>
                  <td style={{ fontSize: 'var(--text-xs)', color: 'var(--color-text-tertiary)' }}>{formatDate(log.created_at)}</td>
                </tr>
              )) : (
                <tr><td colSpan={6} style={{ textAlign: 'center', color: 'var(--color-text-tertiary)', padding: 'var(--space-lg)' }}>暂无操作日志</td></tr>
              )}
            </tbody>
          </table>
        </div>
      </div>

      {/* Recent Audit Logs */}
      <div className="admin-card">
        <div className="admin-card-header">
          <h3 className="admin-card-title">最近审计日志</h3>
          <span style={{ fontSize: 12, color: '#6B7280' }}>最近10条</span>
        </div>
        <div style={{ overflowX: 'auto' }}>
          <table className="admin-table">
            <thead>
              <tr>
                <th>操作人</th>
                <th>操作类型</th>
                <th>目标类型</th>
                <th>详情</th>
                <th>时间</th>
              </tr>
            </thead>
            <tbody>
              {auditLogs.length > 0 ? auditLogs.map(log => (
                <tr key={log.id}>
                  <td style={{ fontWeight: 500 }}>{log.admin_name}</td>
                  <td><span className="admin-badge badge-warning">{log.action}</span></td>
                  <td><span className="admin-badge badge neutral">{log.target_type}</span></td>
                  <td>{log.detail}</td>
                  <td style={{ fontSize: 'var(--text-xs)', color: 'var(--color-text-tertiary)' }}>{formatDate(log.created_at)}</td>
                </tr>
              )) : (
                <tr><td colSpan={5} style={{ textAlign: 'center', color: 'var(--color-text-tertiary)', padding: 'var(--space-lg)' }}>暂无审计日志</td></tr>
              )}
            </tbody>
          </table>
        </div>
      </div>
    </div>
  );
};

export default Dashboard;