import { useEffect, useState, useRef } from 'react';
import { Col, Spin, Empty, Tag, Progress, Skeleton, Tooltip, Card, Typography } from 'antd';
import {
  InfoCircleOutlined,
  DashboardOutlined,
} from '@ant-design/icons';
import { Column, Pie, Funnel, Line } from '@ant-design/charts';
import type { EntityStat, FieldBreakdown, WidgetData } from './dashboardTypes';
import { TAG_COLORS, WIDGET_ICON_MAP } from './dashboardConstants';

// ── 计数动画 Hook ──

function useCountUp(end: number, duration = 800) {
  const [count, setCount] = useState(0);
  const prevEnd = useRef(end);
  useEffect(() => {
    if (end === prevEnd.current && count > 0) return;
    prevEnd.current = end;
    if (end === 0) { setCount(0); return; }
    const startTime = performance.now();
    function tick(now: number) {
      const elapsed = now - startTime;
      const progress = Math.min(elapsed / duration, 1);
      const eased = 1 - Math.pow(1 - progress, 3);
      setCount(Math.round(end * eased));
      if (progress < 1) requestAnimationFrame(tick);
    }
    requestAnimationFrame(tick);
  }, [end, duration]);
  return count;
}

// ── 共享工具 ──

function prepareChartData(data: WidgetData['data'], dimensionOrder?: string[]) {
  return dimensionOrder
    ? dimensionOrder
        .map((key) => data.find((d) => d.key === key))
        .filter(Boolean)
        .map((d) => ({ key: d!.key, count: d!.count }))
    : data.map((d) => ({ key: d.key, count: d.count }));
}

const TAG_COLOR_MAP: Record<string, string> = {
  blue: '#3B82F6', green: '#10B981', orange: '#F59E0B', red: '#EF4444',
  purple: '#8B5CF6', cyan: '#06B6D4', magenta: '#EC4899', gold: '#EAB308',
  lime: '#84CC16', geekblue: '#6366F1', volcano: '#F97316',
};

function tagStrokeColor(color: string): string {
  return TAG_COLOR_MAP[color] || '#3B82F6';
}

function WidgetCardShell({
  title,
  widgetType,
  children,
}: {
  title: string;
  widgetType: string;
  children: React.ReactNode;
}) {
  return (
    <Card
      size="small"
      title={<span style={{ fontSize: 14 }}>{WIDGET_ICON_MAP[widgetType]} {title}</span>}
      className="erp-fade-in"
    >
      {children}
    </Card>
  );
}

function ChartEmpty() {
  return <Empty image={Empty.PRESENTED_IMAGE_SIMPLE} description="暂无数据" />;
}

// ── 基础子组件 ──

function StatValue({ value, loading }: { value: number; loading: boolean }) {
  const animatedValue = useCountUp(value);
  if (loading) return <Spin size="small" />;
  return <span className="erp-count-up">{animatedValue.toLocaleString()}</span>;
}

/** 顶部统计卡片 */
export function StatCard({ stat, loading, delay }: { stat: EntityStat; loading: boolean; delay: string }) {
  return (
    <Col xs={12} sm={8} lg={Math.max(4, 24 / 5)} key={stat.name}>
      <div
        className={`erp-stat-card ${delay}`}
        style={{ '--card-gradient': stat.gradient, '--card-icon-bg': stat.iconBg } as React.CSSProperties}
      >
        <div className="erp-stat-card-bar" />
        <div className="erp-stat-card-body">
          <div className="erp-stat-card-info">
            <div className="erp-stat-card-title">{stat.displayName}</div>
            <div className="erp-stat-card-value">
              <StatValue value={stat.count} loading={loading} />
            </div>
          </div>
          <div className="erp-stat-card-icon">{stat.icon}</div>
        </div>
      </div>
    </Col>
  );
}

/** 骨架屏卡片 */
export function SkeletonStatCard({ delay }: { delay: string }) {
  return (
    <Col xs={12} sm={8} lg={Math.max(4, 24 / 5)}>
      <div className={`erp-stat-card ${delay}`}>
        <div className="erp-stat-card-bar" style={{ opacity: 0.3 }} />
        <div className="erp-stat-card-body">
          <div className="erp-stat-card-info">
            <div style={{ width: 80, height: 14, marginBottom: 12 }}>
              <Skeleton.Input active size="small" style={{ width: 80, height: 14 }} />
            </div>
            <div style={{ width: 60, height: 32 }}>
              <Skeleton.Input active style={{ width: 60, height: 32 }} />
            </div>
          </div>
          <div style={{ width: 48, height: 48 }}>
            <Skeleton.Avatar active shape="square" size={48} />
          </div>
        </div>
      </div>
    </Col>
  );
}

/** 字段分布卡片 */
export function BreakdownCard({
  breakdown, totalCount, index,
}: { breakdown: FieldBreakdown; totalCount: number; index: number }) {
  const maxCount = Math.max(...breakdown.items.map((i) => i.count), 1);
  return (
    <Col xs={24} sm={12} lg={8} key={breakdown.fieldName}>
      <div className="erp-content-card erp-fade-in" style={{ animationDelay: `${0.05 * index}s`, opacity: 0 }}>
        <div className="erp-section-header" style={{ marginBottom: 16 }}>
          <InfoCircleOutlined className="erp-section-icon" style={{ fontSize: 14 }} />
          <span style={{ fontSize: 14, fontWeight: 600, color: 'var(--erp-text-primary)' }}>
            {breakdown.displayName}
          </span>
          <span style={{ marginLeft: 'auto', fontSize: 12, color: 'var(--erp-text-tertiary)' }}>
            {breakdown.items.length} 项
          </span>
        </div>
        <div style={{ display: 'flex', flexDirection: 'column', gap: 10 }}>
          {breakdown.items.map((item, idx) => {
            const percent = totalCount > 0 ? Math.round((item.count / totalCount) * 100) : 0;
            const barPercent = maxCount > 0 ? Math.round((item.count / maxCount) * 100) : 0;
            const color = TAG_COLORS[idx % TAG_COLORS.length];
            return (
              <div key={`${breakdown.fieldName}-${item.key}-${idx}`}>
                <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', marginBottom: 4 }}>
                  <Tooltip title={`${item.key}: ${item.count} (${percent}%)`}>
                    <Tag color={color} style={{ margin: 0, maxWidth: '60%', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
                      {item.key || '(空)'}
                    </Tag>
                  </Tooltip>
                  <span style={{ fontSize: 13, fontWeight: 600, color: 'var(--erp-text-primary)', fontVariantNumeric: 'tabular-nums' }}>
                    {item.count}
                    <span style={{ fontSize: 11, fontWeight: 400, color: 'var(--erp-text-tertiary)', marginLeft: 4 }}>{percent}%</span>
                  </span>
                </div>
                <Progress
                  percent={barPercent}
                  showInfo={false}
                  strokeColor={tagStrokeColor(color)}
                  trailColor="var(--erp-border-light)"
                  size="small"
                  style={{ marginBottom: 0 }}
                />
              </div>
            );
          })}
        </div>
        {breakdown.items.length === 0 && (
          <Empty image={Empty.PRESENTED_IMAGE_SIMPLE} description="暂无数据" style={{ padding: '12px 0' }} />
        )}
      </div>
    </Col>
  );
}

/** 骨架屏分布卡片 */
export function SkeletonBreakdownCard({ index }: { index: number }) {
  return (
    <Col xs={24} sm={12} lg={8}>
      <div className="erp-content-card erp-fade-in" style={{ animationDelay: `${0.05 * index}s`, opacity: 0 }}>
        <Skeleton active paragraph={{ rows: 4 }} />
      </div>
    </Col>
  );
}

// ── Widget 图表子组件 ──

/** 统计卡片 widget */
function StatWidgetCard({ widgetData }: { widgetData: WidgetData }) {
  const { widget, count } = widgetData;
  const animatedValue = useCountUp(count ?? 0);
  const color = widget.color || '#4F46E5';
  return (
    <Card size="small" className="erp-fade-in" style={{ height: '100%' }}>
      <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
        <div style={{
          width: 40, height: 40, borderRadius: 10, background: `${color}18`,
          display: 'flex', alignItems: 'center', justifyContent: 'center', color, fontSize: 20,
        }}>
          {WIDGET_ICON_MAP[widget.type] || <DashboardOutlined />}
        </div>
        <div style={{ flex: 1 }}>
          <Typography.Text type="secondary" style={{ fontSize: 12 }}>{widget.title}</Typography.Text>
          <div style={{ fontSize: 24, fontWeight: 700, fontVariantNumeric: 'tabular-nums' }}>
            {animatedValue.toLocaleString()}
          </div>
        </div>
      </div>
    </Card>
  );
}

/** 柱状图 widget */
function BarWidgetCard({ widgetData, isDark }: { widgetData: WidgetData; isDark: boolean }) {
  const { widget, data } = widgetData;
  const chartData = prepareChartData(data, widget.dimension_order);
  const axisLabelStyle = { fill: isDark ? '#94A3B8' : '#475569' };
  return (
    <WidgetCardShell title={widget.title} widgetType={widget.type}>
      {chartData.length > 0 ? (
        <Column data={chartData} xField="key" yField="count" colorField="key"
          style={{ maxWidth: 40, maxWidthRatio: 0.6 }}
          axis={{ x: { label: { style: axisLabelStyle } }, y: { label: { style: axisLabelStyle } } }}
        />
      ) : <ChartEmpty />}
    </WidgetCardShell>
  );
}

/** 饼图 widget */
function PieWidgetCard({ widgetData }: { widgetData: WidgetData }) {
  const { widget, data } = widgetData;
  const chartData = data.map((d) => ({ key: d.key, count: d.count }));
  return (
    <WidgetCardShell title={widget.title} widgetType={widget.type}>
      {chartData.length > 0 ? (
        <Pie data={chartData} angleField="count" colorField="key" radius={0.8} innerRadius={0.5}
          label={{ text: 'key', position: 'outside' as const }}
          legend={{ color: { position: 'bottom' as const } }}
        />
      ) : <ChartEmpty />}
    </WidgetCardShell>
  );
}

/** 漏斗图 widget */
function FunnelWidgetCard({ widgetData }: { widgetData: WidgetData }) {
  const { widget, data } = widgetData;
  const chartData = prepareChartData(data, widget.dimension_order);
  return (
    <WidgetCardShell title={widget.title} widgetType={widget.type}>
      {chartData.length > 0 ? (
        <Funnel data={chartData} xField="key" yField="count" legend={{ position: 'bottom' as const }} />
      ) : <ChartEmpty />}
    </WidgetCardShell>
  );
}

/** 折线图 widget */
function LineWidgetCard({ widgetData, isDark }: { widgetData: WidgetData; isDark: boolean }) {
  const { widget, data } = widgetData;
  const chartData = prepareChartData(data, widget.dimension_order);
  const axisLabelStyle = { fill: isDark ? '#94A3B8' : '#475569' };
  return (
    <WidgetCardShell title={widget.title} widgetType={widget.type}>
      {chartData.length > 0 ? (
        <Line data={chartData} xField="key" yField="count" smooth
          axis={{ x: { label: { style: axisLabelStyle } }, y: { label: { style: axisLabelStyle } } }}
        />
      ) : <ChartEmpty />}
    </WidgetCardShell>
  );
}

/** 渲染单个 widget */
export function WidgetRenderer({ widgetData, isDark }: { widgetData: WidgetData; isDark: boolean }) {
  switch (widgetData.widget.type) {
    case 'stat_card': return <StatWidgetCard widgetData={widgetData} />;
    case 'bar_chart': return <BarWidgetCard widgetData={widgetData} isDark={isDark} />;
    case 'pie_chart': return <PieWidgetCard widgetData={widgetData} />;
    case 'funnel_chart': return <FunnelWidgetCard widgetData={widgetData} />;
    case 'line_chart': return <LineWidgetCard widgetData={widgetData} isDark={isDark} />;
    default: return null;
  }
}
