import { useCallback, useEffect, useMemo, useState } from 'react';
import { useNavigate } from 'react-router-dom';
import type { PartnerWeeklyReportResponse } from '@dukang/shared-types';
import PageHeader from '@dukang/shared-ui/PageHeader';
import PullToRefresh from '@dukang/shared-ui/PullToRefresh';
import { fetchPartnerWeeklyReport } from '../lib/weeklyReport';
import { usePartnerPageView } from '../lib/usePageView';

function fmtMoney(n: number) {
  return n.toLocaleString('zh-CN', { minimumFractionDigits: 0, maximumFractionDigits: 0 });
}

function fmtGrowth(n: number) {
  const sign = n > 0 ? '+' : '';
  return `${sign}${n}%`;
}

export default function WeeklyReportPage() {
  usePartnerPageView('partner_weekly_report_view');
  const navigate = useNavigate();
  const [selectedStart, setSelectedStart] = useState<string | undefined>();
  const [data, setData] = useState<PartnerWeeklyReportResponse | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');

  const loadWeeklyReport = useCallback(() => {
    setLoading(true);
    setError('');
    return fetchPartnerWeeklyReport(selectedStart)
      .then(setData)
      .catch((e) => {
        setData(null);
        setError(e instanceof Error ? e.message : '加载失败');
      })
      .finally(() => setLoading(false));
  }, [selectedStart]);

  useEffect(() => {
    void loadWeeklyReport();
  }, [loadWeeklyReport]);

  const maxDailyGmv = useMemo(() => {
    if (!data?.dailyGmv.length) return 1;
    return Math.max(1, ...data.dailyGmv.map((item) => item.amount));
  }, [data]);

  const topStores = data?.storeRanking.slice(0, 3) ?? [];
  const summary = data?.summary;
  const growthPositive = (summary?.gmvGrowthPercent ?? 0) >= 0;

  return (
    <PullToRefresh onRefresh={loadWeeklyReport} className="page-no-tab">
      <PageHeader title="数据周报" onBack={() => navigate('/')} />

      <main className="partner-weekly-page">
        <section className="partner-weekly-title-section">
          <h2>经营数据周报</h2>
          {data && (
            <div className="partner-weekly-tabs">
              {data.availablePeriods.map((period) => (
                <button
                  key={period.startDate}
                  type="button"
                  className={`partner-weekly-tab${
                    period.startDate === data.period.startDate ? ' active' : ''
                  }`}
                  onClick={() => setSelectedStart(period.startDate)}
                >
                  {period.label}
                </button>
              ))}
            </div>
          )}
        </section>

        {loading && <p className="label-md text-muted partner-weekly-state">加载中…</p>}
        {!loading && error && (
          <p className="label-md text-error partner-weekly-state">{error}</p>
        )}

        {!loading && !error && data && summary && (
          <>
            <section className="partner-weekly-hero">
              <div className="partner-weekly-hero-top">
                <div>
                  <p className="partner-weekly-hero-label">累计成交额 (GMV)</p>
                  <p className="partner-weekly-hero-gmv">¥{fmtMoney(summary.gmv)}</p>
                </div>
                <div
                  className={`partner-weekly-growth-badge${
                    growthPositive ? ' partner-weekly-growth-badge--up' : ' partner-weekly-growth-badge--down'
                  }`}
                >
                  <span className="material-symbols-outlined">
                    {growthPositive ? 'trending_up' : 'trending_down'}
                  </span>
                  <span>{fmtGrowth(summary.gmvGrowthPercent)}</span>
                </div>
              </div>
              <div className="partner-weekly-hero-grid">
                <div>
                  <p className="label-md text-muted">活跃门店</p>
                  <p className="partner-weekly-stat-value">
                    {summary.activeStoreCount}
                    <span className="partner-weekly-stat-sub">/ {summary.totalStoreCount}</span>
                  </p>
                </div>
                <div>
                  <p className="label-md text-muted">订单总量</p>
                  <p className="partner-weekly-stat-value">{summary.orderCount}</p>
                </div>
              </div>
            </section>

            <section className="partner-weekly-card">
              <div className="partner-weekly-card-header">
                <div className="partner-weekly-card-title">
                  <span className="material-symbols-outlined partner-weekly-icon-amber">storefront</span>
                  <h3 className="headline-md">本周新签约门店</h3>
                </div>
                <p className="partner-weekly-target">
                  {summary.newStoreCount}
                  <span className="partner-weekly-target-sub">/ {summary.newStoreTarget}</span>
                </p>
              </div>
              <div className="partner-weekly-progress-track">
                <div
                  className="partner-weekly-progress-bar"
                  style={{ width: `${summary.newStoreProgressPercent}%` }}
                />
              </div>
              <p className="label-md text-muted partner-weekly-progress-hint">
                已完成本周目标的 {summary.newStoreProgressPercent}%。
                {summary.newStoreCount < summary.newStoreTarget
                  ? `还差 ${summary.newStoreTarget - summary.newStoreCount} 家！`
                  : '目标已达成！'}
              </p>
            </section>

            <section className="partner-weekly-card">
              <div className="partner-weekly-card-header">
                <h3 className="headline-md">每日成交趋势</h3>
                <span className="label-md text-muted">过去 7 天</span>
              </div>
              <div className="partner-weekly-chart">
                <div className="partner-weekly-chart-bars">
                  {data.dailyGmv.map((item) => {
                    const height = Math.max(8, Math.round((item.amount / maxDailyGmv) * 100));
                    const isMax = item.amount === maxDailyGmv && item.amount > 0;
                    return (
                      <div
                        key={item.date}
                        className={`partner-weekly-chart-bar${isMax ? ' partner-weekly-chart-bar--peak' : ''}`}
                        style={{ height: `${height}%` }}
                        title={`${item.weekdayLabel} ¥${fmtMoney(item.amount)}`}
                      />
                    );
                  })}
                </div>
                <div className="partner-weekly-chart-labels">
                  {data.dailyGmv.map((item) => (
                    <span key={item.date}>{item.weekdayLabel}</span>
                  ))}
                </div>
              </div>
            </section>

            <section className="partner-weekly-rank-section">
              <div className="partner-weekly-card-header">
                <h3 className="headline-md">门店业绩排行</h3>
                <button
                  type="button"
                  className="partner-weekly-link"
                  onClick={() => navigate('/stores')}
                >
                  查看全部
                  <span className="material-symbols-outlined">arrow_forward</span>
                </button>
              </div>
              {topStores.length === 0 ? (
                <p className="label-md text-muted partner-weekly-empty">本周暂无核销排行数据</p>
              ) : (
                <div className="partner-weekly-rank-list">
                  {topStores.map((store) => (
                    <div
                      key={store.storeId}
                      className={`partner-weekly-rank-row${
                        store.rank === 1 ? ' partner-weekly-rank-row--first' : ''
                      }`}
                    >
                      <div className="partner-weekly-rank-badge">
                        {store.rank === 1 ? (
                          <span className="material-symbols-outlined">workspace_premium</span>
                        ) : (
                          <span>{store.rank}</span>
                        )}
                      </div>
                      <div className="partner-weekly-rank-info">
                        <p className="partner-weekly-rank-name">{store.name}</p>
                        {store.subtitle && (
                          <p className="label-md text-muted">{store.subtitle}</p>
                        )}
                      </div>
                      <p className="partner-weekly-rank-amount">¥{fmtMoney(store.redeemAmount)}</p>
                    </div>
                  ))}
                </div>
              )}
            </section>

            <section className="partner-weekly-insight">
              <span className="material-symbols-outlined">tips_and_updates</span>
              <div>
                <p className="headline-md">合伙人经营策略</p>
                <p className="body-md text-muted">{data.insight}</p>
              </div>
            </section>
          </>
        )}
      </main>
    </PullToRefresh>
  );
}