import React, { useEffect, useState } from 'react';
import {
  AppstoreOutlined,
  BarChartOutlined,
  BulbOutlined,
  CalendarOutlined,
  LineChartOutlined,
  RiseOutlined,
  FullscreenOutlined,
  LeftOutlined,
  RightOutlined,
  TableOutlined,
} from '@ant-design/icons';
import { Alert, DatePicker, Select, Skeleton } from 'antd';
import dayjs from 'dayjs';
import {
  SycmDashboardMetric,
  SycmGrowthFactorCard,
  SycmInsightNotice,
  SycmMetricStrip,
  SycmRecommendationCard,
  SycmRealtimeTrendChart,
  SycmSegmentedSwitch,
  SycmSimpleTable,
  SycmSparkline,
} from '../../components/Common';
import { getDevelopmentDashboard, getProductAnalysisMeta } from '../../api/productAnalysis';
import './stylePreview.css';

const overviewMetrics = [
  { key: 'payAmount', label: '支付金额', value: '暂无数据', change: '无可比', compare: '暂无数据', tone: 'up', featured: true },
  { key: 'payOrderCount', label: '支付订单数', value: '暂无数据', change: '无可比', compare: '暂无数据', tone: 'up' },
  { key: 'visitorCount', label: '访客数', value: '暂无数据', change: '无可比', compare: '暂无数据', tone: 'up' },
  { key: 'buyerCount', label: '支付买家数', value: '暂无数据', change: '无可比', compare: '暂无数据', tone: 'up' },
  { key: 'conversionRate', label: '支付转化率', value: '暂无数据', change: '无可比', compare: '暂无数据', tone: 'up' },
  { key: 'payGoodsQty', label: '支付件数', value: '暂无数据', change: '无可比', compare: '暂无数据', tone: 'up' },
  { key: 'favoriteCount', label: '收藏人数', value: '暂无数据', change: '无可比', compare: '暂无数据', tone: 'up' },
  { key: 'goodsPv', label: '商品浏览量', value: '暂无数据', change: '无可比', compare: '暂无数据', tone: 'up' },
];

const topOverviewMetrics = overviewMetrics.slice(0, 8);

const growthFactors = [
  { key: 'payAmount', label: '支付金额', trendKey: 'payAmount' },
  { key: 'payOrderCount', label: '支付订单数', trendKey: 'payOrderCount' },
  { key: 'payGoodsQty', label: '支付件数', trendKey: 'payGoodsQty' },
  { key: 'favoriteCount', label: '收藏人数', trendKey: 'favoriteCount' },
];

const adColumns = [
  { key: 'scene', title: '经营指标', primary: true },
  { key: 'spend', title: '当前周期' },
  { key: 'click', title: '上一周期' },
  { key: 'roi', title: '环比变化' },
];

const suggestions = [
  {
    tag: '经营提示',
    title: '关注核心经营指标的周期变化',
    desc: '结合支付金额、支付订单数、支付件数与访客变化，判断当前周期的增长质量。',
    action: '查看指标',
    tone: 'default',
  },
];

const guidelineItems = [
  { icon: AppstoreOutlined, label: '白底卡片', value: '1px 边框 + 轻阴影' },
  { icon: BarChartOutlined, label: '12px 密度', value: '表格/辅助信息优先 12px' },
  { icon: LineChartOutlined, label: '业务图表', value: '3px 线宽 + 弱网格' },
  { icon: TableOutlined, label: '模块即规范', value: '新子页面以本页验收' },
];

const formatToneIcon = (tone) => (tone === 'down' ? '↓' : '↑');
const formatValueParts = (value) => {
  const match = value.match(/^(.+?\.)(\d+%?)$/);
  return match ? { main: match[1], decimal: match[2] } : { main: value, decimal: '' };
};
const renderValueParts = (value) => {
  const parts = formatValueParts(value);
  return (
    <>
      <span>{parts.main}</span>
      {parts.decimal ? <small>{parts.decimal}</small> : null}
    </>
  );
};

const PERIOD_MAP = { 日: 'day', 周: 'week', 月: 'month' };
const PERIOD_PICKER_MAP = { 日: 'date', 周: 'week', 月: 'month' };
const { RangePicker } = DatePicker;
const DASHBOARD_REQUEST_TIMEOUT_MS = Math.max(
  Number(import.meta.env.VITE_DASHBOARD_REQUEST_TIMEOUT_MS) || Number(import.meta.env.VITE_API_REQUEST_TIMEOUT_MS) || 180000,
  15000
);
const numberFormatter = new Intl.NumberFormat('zh-CN', { maximumFractionDigits: 0 });
const moneyFormatter = new Intl.NumberFormat('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 });

const formatDashboardValue = (value, format) => {
  if (value === null || value === undefined || !Number.isFinite(Number(value))) return '暂无数据';
  if (format === 'money') return moneyFormatter.format(Number(value));
  if (format === 'percent') return `${Number(value).toFixed(2)}%`;
  return numberFormatter.format(Number(value));
};

const formatChange = (value) => (
  value === null || value === undefined || !Number.isFinite(Number(value))
    ? '无可比'
    : `${Math.abs(Number(value)).toFixed(2)}%`
);
const formatShortDate = (value) => (value ? value.slice(5) : '暂无');
const formatCompactMoney = (value) => {
  if (!Number.isFinite(Number(value))) return '暂无数据';
  const amount = Number(value);
  return amount >= 10000 ? `${(amount / 10000).toFixed(2)}万` : moneyFormatter.format(amount);
};

const resolvePeriodDateRange = (value, period) => {
  const selected = value.startOf('day');
  if (period === '月') {
    return [selected.startOf('month'), selected.endOf('month').startOf('day')];
  }
  if (period === '周') {
    const weekday = selected.day();
    const monday = selected.add(weekday === 0 ? -6 : 1 - weekday, 'day');
    return [monday, monday.add(6, 'day')];
  }
  return [selected, selected];
};

const buildTrendChart = (rows = []) => {
  if (!rows.length) {
    return { xLabels: [], yLabels: [], path: '', areaPath: '', points: [] };
  }
  const displayed = rows.length <= 6
    ? rows
    : Array.from({ length: 6 }, (_, index) => rows[Math.round((rows.length - 1) * index / 5)]);
  const maxValue = Math.max(...displayed.map((row) => Number(row.payAmount) || 0), 1);
  const points = displayed.map((row, index) => {
    const x = displayed.length === 1 ? 356 : 76 + (560 * index) / (displayed.length - 1);
    const y = 392 - ((Number(row.payAmount) || 0) / maxValue) * 300;
    return { ...row, x, primaryY: y, compareY: null, primaryValue: formatCompactMoney(row.payAmount), compareValue: '无对比', label: row.date };
  });
  const path = points.map((point, index) => `${index ? 'L' : 'M'}${point.x.toFixed(1)} ${point.primaryY.toFixed(1)}`).join(' ');
  return {
    xLabels: displayed.map((row) => formatShortDate(row.date)),
    yLabels: [1, 0.75, 0.5, 0.25].map((ratio, index) => ({ label: formatCompactMoney(maxValue * ratio), y: 92 + index * 78 })),
    path,
    areaPath: path ? `${path} L${points.at(-1).x.toFixed(1)} 392 L${points[0].x.toFixed(1)} 392 Z` : '',
    points,
  };
};

const activateWithKeyboard = (callback) => (event) => {
  if (event.key === 'Enter' || event.key === ' ') {
    event.preventDefault();
    callback();
  }
};

const DevelopmentStylePreview = () => {
  const [suggestionIndex, setSuggestionIndex] = useState(0);
  const [selectedMetricIndex, setSelectedMetricIndex] = useState(0);
  const [selectedGrowthIndex, setSelectedGrowthIndex] = useState(0);
  const [activePeriod, setActivePeriod] = useState('周');
  const [periodPickerType, setPeriodPickerType] = useState('周');
  const [periodPickerOpen, setPeriodPickerOpen] = useState(false);
  const [customStartDate, setCustomStartDate] = useState('');
  const [customEndDate, setCustomEndDate] = useState('');
  const [selectedAdScene, setSelectedAdScene] = useState('支付金额');
  const [recommendationFeedback, setRecommendationFeedback] = useState({});
  const [selectedJourney, setSelectedJourney] = useState('曝光人数');
  const [selectedGuideline, setSelectedGuideline] = useState(guidelineItems[0].label);
  const [dashboard, setDashboard] = useState(null);
  const [dashboardLoading, setDashboardLoading] = useState(true);
  const [dashboardError, setDashboardError] = useState('');
  const [shopName, setShopName] = useState('');
  const [shopOptions, setShopOptions] = useState([{ value: '', label: '全部店铺' }]);
  const [shopOptionsLoading, setShopOptionsLoading] = useState(true);

  useEffect(() => {
    let active = true;
    getProductAnalysisMeta().then((response) => {
      if (!active) return;
      const shops = Array.isArray(response?.data?.shops) ? response.data.shops : [];
      setShopOptions([
        { value: '', label: '全部店铺' },
        ...shops.map((name) => ({ value: name, label: name })),
      ]);
    }).catch(() => {
      if (active) setShopOptions([{ value: '', label: '全部店铺' }]);
    }).finally(() => {
      if (active) setShopOptionsLoading(false);
    });
    return () => {
      active = false;
    };
  }, []);

  useEffect(() => {
    const controller = new AbortController();
    const params = customStartDate && customEndDate
      ? { startDate: customStartDate, endDate: customEndDate, shopName: shopName || undefined }
      : { period: PERIOD_MAP[activePeriod] || 'week', shopName: shopName || undefined };
    getDevelopmentDashboard(params, { signal: controller.signal, timeout: DASHBOARD_REQUEST_TIMEOUT_MS }).then((response) => {
      const payload = response?.data || {};
      setDashboard(payload);
    }).catch((error) => {
      if (error?.code !== 'ERR_CANCELED') {
        setDashboardError(error?.response?.data?.error || error.message || '首页数据加载失败');
      }
    }).finally(() => {
      if (!controller.signal.aborted) setDashboardLoading(false);
    });
    return () => controller.abort();
  }, [activePeriod, customStartDate, customEndDate, shopName]);

  const applyDateRange = (startDate, endDate, period) => {
    setDashboardLoading(true);
    setDashboardError('');
    setActivePeriod(period);
    setCustomStartDate(startDate.format('YYYY-MM-DD'));
    setCustomEndDate(endDate.format('YYYY-MM-DD'));
    setPeriodPickerOpen(false);
  };
  const handlePeriodChange = (period) => {
    setPeriodPickerType(period);
    setPeriodPickerOpen(true);
  };
  const handlePeriodDateChange = (value) => {
    if (!value) {
      setPeriodPickerOpen(false);
      return;
    }
    const [startDate, endDate] = resolvePeriodDateRange(value, periodPickerType);
    applyDateRange(startDate, endDate, periodPickerType);
  };
  const handleCustomDateChange = (value) => {
    if (!Array.isArray(value) || value.length !== 2 || !value[0] || !value[1]) {
      setDashboardLoading(true);
      setDashboardError('');
      setActivePeriod('周');
      setPeriodPickerType('周');
      setCustomStartDate('');
      setCustomEndDate('');
      return;
    }
    applyDateRange(value[0], value[1], '自定义');
  };
  const handleShopChange = (value) => {
    setShopName(value || '');
    setDashboardLoading(true);
    setDashboardError('');
  };
  const displayedDateRange = customStartDate && customEndDate
    ? [dayjs(customStartDate), dayjs(customEndDate)]
    : dashboard?.startDate && dashboard?.latestDate
      ? [dayjs(dashboard.startDate), dayjs(dashboard.latestDate)]
      : null;
  const periodPickerValue = customStartDate || dashboard?.latestDate
    ? dayjs(customStartDate || dashboard.latestDate)
    : null;
  const displayedOverviewMetrics = topOverviewMetrics.map((fallback) => {
    const metric = dashboard?.metrics?.find((item) => item.key === fallback.key);
    if (!metric) return fallback;
    const tone = Number(metric.change) < 0 ? 'down' : 'up';
    return {
      ...fallback,
      label: metric.label || fallback.label,
      value: formatDashboardValue(metric.value, metric.format),
      compare: formatDashboardValue(metric.previous, metric.format),
      change: formatChange(metric.change),
      tone,
    };
  });
  const trendChart = buildTrendChart(dashboard?.trend || []);
  const dashboardMetricMap = new Map((dashboard?.metrics || []).map((item) => [item.key, item]));
  const displayedGrowthFactors = growthFactors.map((item) => {
    const metric = dashboardMetricMap.get(item.key) || {};
    return {
      ...item,
      value: formatDashboardValue(metric.value, metric.format),
      change: formatChange(metric.change),
      benchmark: formatDashboardValue(metric.previous, metric.format),
      series: (dashboard?.trend || []).map((row) => ({
        label: row.date,
        value: Number(row[item.trendKey]) || 0,
        display: formatDashboardValue(row[item.trendKey], metric.format),
      })),
    };
  });
  const efficiencyMetricKeys = ['payAmount', 'payOrderCount', 'payGoodsQty'];
  const displayedAdStats = efficiencyMetricKeys.map((key) => {
    const metric = dashboardMetricMap.get(key) || {};
    const tone = Number(metric.change) < 0 ? 'down' : 'up';
    const change = formatChange(metric.change);
    return {
      label: metric.label || key,
      value: formatDashboardValue(metric.value, metric.format),
      trend: change === '无可比' ? change : `${formatToneIcon(tone)} ${change}`,
      tone,
    };
  });
  const displayedAdRows = efficiencyMetricKeys.map((key) => {
    const metric = dashboardMetricMap.get(key) || {};
    const tone = Number(metric.change) < 0 ? 'down' : 'up';
    const change = formatChange(metric.change);
    return {
      scene: metric.label || key,
      spend: formatDashboardValue(metric.value, metric.format),
      click: formatDashboardValue(metric.previous, metric.format),
      roi: change === '无可比' ? change : `${formatToneIcon(tone)} ${change}`,
    };
  });
  const currentTotals = (dashboard?.trend || []).reduce((result, row) => ({
    impressionCount: result.impressionCount + (Number(row.impressionCount) || 0),
  }), { impressionCount: 0 });
  const journeySteps = [
    { label: '曝光人数', value: formatDashboardValue(currentTotals.impressionCount, 'integer'), sub: '商品曝光人数' },
    { label: '访客人数', value: formatDashboardValue(dashboardMetricMap.get('visitorCount')?.value, 'integer'), sub: '进入商品详情' },
    { label: '商品浏览', value: formatDashboardValue(dashboardMetricMap.get('goodsPv')?.value, 'integer'), sub: '商品浏览次数' },
    { label: '收藏人数', value: formatDashboardValue(dashboardMetricMap.get('favoriteCount')?.value, 'integer'), sub: '产生收藏行为' },
    { label: '支付买家', value: formatDashboardValue(dashboardMetricMap.get('buyerCount')?.value, 'integer'), sub: '完成支付买家' },
  ];
  const suggestion = suggestions[suggestionIndex];
  const moveSuggestion = (offset) => {
    setSuggestionIndex((current) => (current + offset + suggestions.length) % suggestions.length);
  };

  return (
    <div className="development-style-preview">
    <main className="preview-workbench">
      <section className="preview-hero-grid">
        <section className="preview-overview-panel">
          <header className="preview-overview-header">
            <div className="preview-overview-title">
              <span className="preview-overview-title__mark" />
              <h1>数据概览</h1>
            </div>
            <span className="preview-overview-time">
              {dashboard?.latestDate ? `统计日期 ${dashboard.startDate} 至 ${dashboard.latestDate}` : '统计日期加载中'}
              {dashboardLoading && dashboard ? '（更新中）' : ''}
            </span>
              <div className="preview-overview-actions">
              <Select
                className="preview-shop-select"
                value={shopName}
                options={shopOptions}
                loading={shopOptionsLoading}
                onChange={handleShopChange}
                showSearch
                optionFilterProp="label"
                placeholder="选择店铺"
                aria-label="筛选店铺"
                popupMatchSelectWidth={260}
              />
              <div className="preview-period-selector">
                <SycmSegmentedSwitch
                  items={['日', '周', '月']}
                  activeKey={periodPickerOpen ? periodPickerType : activePeriod}
                  onChange={handlePeriodChange}
                  className="preview-period-switch"
                />
                <DatePicker
                  className="preview-period-picker-anchor"
                  popupClassName="preview-period-picker-popup"
                  picker={PERIOD_PICKER_MAP[periodPickerType]}
                  value={periodPickerValue}
                  open={periodPickerOpen}
                  onChange={handlePeriodDateChange}
                  onOpenChange={(open) => {
                    if (!open) setPeriodPickerOpen(false);
                  }}
                  allowClear={false}
                  inputReadOnly
                  disabledDate={(current) => current?.isAfter(dayjs(), 'day')}
                />
              </div>
              <RangePicker
                className={`preview-custom-date${activePeriod === '自定义' ? ' is-active' : ''}`}
                value={displayedDateRange}
                onChange={handleCustomDateChange}
                allowClear
                format="YYYY-MM-DD"
                placeholder={['开始日期', '结束日期']}
                suffixIcon={<CalendarOutlined />}
                disabledDate={(current, info) => {
                  if (current?.isAfter(dayjs(), 'day')) return true;
                  return info?.from
                    ? Math.abs(current.startOf('day').diff(info.from.startOf('day'), 'day')) > 89
                    : false;
                }}
              />
              <button type="button" className="preview-primary-action"><FullscreenOutlined />全部指标</button>
            </div>
          </header>
          {dashboardError ? <Alert type="error" showIcon message={dashboardError} className="preview-dashboard-alert" /> : null}

          <div className="preview-overview-body">
            <section className="preview-metrics" aria-label="核心经营指标">
              {dashboardLoading && !dashboard ? <Skeleton active paragraph={{ rows: 8 }} /> : displayedOverviewMetrics.map((item, index) => (
                <SycmDashboardMetric
                  key={item.label}
                  label={item.label}
                  value={renderValueParts(item.value)}
                  trend={item.change === '无可比' ? item.change : `${formatToneIcon(item.tone)} ${item.change}`}
                  trendTone={item.tone}
                  footerLabel="上一周期"
                  footerValue={item.compare}
                  selected={selectedMetricIndex === index}
                  className={`preview-metric-card${index === 0 ? ' is-featured' : ''}`}
                  slotPrefix="preview-metric-card"
                  role="button"
                  tabIndex={0}
                  aria-pressed={selectedMetricIndex === index}
                  onClick={() => setSelectedMetricIndex(index)}
                  onKeyDown={activateWithKeyboard(() => setSelectedMetricIndex(index))}
                />
              ))}
            </section>

            <SycmRealtimeTrendChart
              aria-label="选定周期成交金额趋势"
              className="preview-realtime-chart-card"
              legendClassName="preview-realtime-legend"
              plotClassName="preview-realtime-chart"
              gridClassName="preview-realtime-chart__grid"
              yAxisClassName="preview-realtime-chart__y-axis"
              areaClassName="preview-realtime-chart__area"
              lineClassName="preview-realtime-chart__line"
              axisClassName="preview-realtime-chart__axis"
              gradientId="previewRealtimeArea"
              legendItems={[{ label: '成交金额', tone: 'today' }]}
              yAxisLabels={trendChart.yLabels}
              xAxisLabels={trendChart.xLabels}
              primaryAreaPath={trendChart.areaPath}
              primaryPath={trendChart.path}
              tooltipItems={trendChart.points}
            />
          </div>
        </section>

      </section>

      <section className="preview-growth-section">
        <header className="preview-growth-section__header">
          <h2>增长因子</h2>
        </header>
        <div className="preview-growth-grid">
          {displayedGrowthFactors.map((item, index) => (
            <SycmGrowthFactorCard
              key={item.label}
              title={item.label}
              value={renderValueParts(item.value)}
              selected={selectedGrowthIndex === index}
              className="preview-growth-card"
              slotPrefix="preview-growth-card"
              role="button"
              tabIndex={0}
              aria-pressed={selectedGrowthIndex === index}
              onClick={() => setSelectedGrowthIndex(index)}
              onKeyDown={activateWithKeyboard(() => setSelectedGrowthIndex(index))}
              sparkline={(
                <SycmSparkline
                  data={item.series}
                  seriesName={item.label}
                  aria-label={`${item.label}近7日趋势`}
                />
              )}
              rows={[
                <>较上一周期 <b>{item.change}</b></>,
                <>上一周期 <em>{item.benchmark}</em></>,
              ]}
            />
          ))}
        </div>

        <div className="preview-ad-grid">
          <SycmInsightNotice
            className="preview-insight-card"
            slotPrefix="preview-insight-card"
            icon={<BulbOutlined />}
            title="拼多多核心经营数据"
            description="支付金额、支付订单数、支付件数、访客和收藏数据均来自拼多多商品日维度业务表。"
          />
        </div>

        <div className="preview-business-grid">
          <SycmMetricStrip className="preview-ad-stats" slotPrefix="preview-ad-stats" items={displayedAdStats} />

          <SycmSimpleTable
            className="preview-table-card"
            slotPrefix="preview-table-card"
            title="经营效率详情"
            extra={dashboard?.latestDate || '加载中'}
            columns={adColumns}
            rows={displayedAdRows}
            rowKey="scene"
            selectedRowKey={selectedAdScene}
            onRowClick={(_, key) => setSelectedAdScene(key)}
          />

          <section className="preview-suggestion-module" aria-label="投放建议轮播">
            <header>
              <h2>投放建议</h2>
              <div className="preview-suggestion-pager">
                <span>{suggestionIndex + 1}/{suggestions.length}</span>
                <button type="button" aria-label="上一条投放建议" onClick={() => moveSuggestion(-1)}><LeftOutlined /></button>
                <button type="button" aria-label="下一条投放建议" onClick={() => moveSuggestion(1)}><RightOutlined /></button>
              </div>
            </header>
            <div className="preview-suggestion-carousel">
              <SycmRecommendationCard
                key={suggestion.title}
                className="preview-suggestion-card"
                slotPrefix="preview-suggestion-card"
                tone={suggestion.tone}
                tag={suggestion.tag}
                title={suggestion.title}
                description={suggestion.desc}
                actions={[
                  {
                    label: '有用',
                    selected: recommendationFeedback[suggestion.title] === '有用',
                    onClick: () => setRecommendationFeedback((current) => ({ ...current, [suggestion.title]: '有用' })),
                  },
                  {
                    label: '无用',
                    selected: recommendationFeedback[suggestion.title] === '无用',
                    onClick: () => setRecommendationFeedback((current) => ({ ...current, [suggestion.title]: '无用' })),
                  },
                  {
                    label: suggestion.action,
                    primary: true,
                    selected: recommendationFeedback[suggestion.title] === suggestion.action,
                    onClick: () => setRecommendationFeedback((current) => ({ ...current, [suggestion.title]: suggestion.action })),
                  },
                ]}
              />
            </div>
          </section>
        </div>
      </section>

      <section className="preview-card preview-journey-card">
        <div className="preview-card__header">
          <div>
            <h2>客户旅程</h2>
            <p>从潜客到支付的漏斗式业务模块，保持横向扫描效率</p>
          </div>
          <RiseOutlined />
        </div>
        <div className="preview-journey">
          {journeySteps.map((step, index) => (
            <article
              key={step.label}
              className={selectedJourney === step.label ? 'is-selected' : undefined}
              role="button"
              tabIndex={0}
              aria-pressed={selectedJourney === step.label}
              onClick={() => setSelectedJourney(step.label)}
              onKeyDown={activateWithKeyboard(() => setSelectedJourney(step.label))}
            >
              <span>{step.label}</span>
              <strong>{step.value}</strong>
              <em>{step.sub}</em>
              {index < journeySteps.length - 1 ? <b aria-hidden="true" /> : null}
            </article>
          ))}
        </div>
      </section>

      <section className="preview-guidelines" aria-label="UI 规范基准">
        {guidelineItems.map((item) => {
          const Icon = item.icon;
          return (
            <div
              key={item.label}
              className={selectedGuideline === item.label ? 'is-selected' : undefined}
              role="button"
              tabIndex={0}
              aria-pressed={selectedGuideline === item.label}
              onClick={() => setSelectedGuideline(item.label)}
              onKeyDown={activateWithKeyboard(() => setSelectedGuideline(item.label))}
            >
              <Icon />
              <span>{item.label}</span>
              <strong>{item.value}</strong>
            </div>
          );
        })}
      </section>
      </main>
    </div>
  );
};

export default DevelopmentStylePreview;