"use client";

import { useEffect, useMemo, useState } from "react";
import { CheckCircle, Database, ClockClockwise } from "@phosphor-icons/react";
import type {
  QuoteDetail,
  QuoteItem,
  RateOption,
  ServiceLevel,
} from "@/lib/frontend/types";
import { formatUSD, formatPercent } from "@/lib/frontend/format";
import { Card } from "@/components/ui/card";

const LEVEL_LABEL: Record<ServiceLevel, string> = {
  standard: "标准",
  guaranteed: "保证送达",
};

const RATE_LABEL: Record<RateOption, string> = {
  lowest: "最低价",
  fastest: "最快",
  bestValue: "最优性价比",
};

const RATE_ORDER: RateOption[] = ["lowest", "bestValue", "fastest"];

interface QuoteCardProps {
  quote: QuoteDetail;
  defaultLevel?: ServiceLevel;
  defaultRate?: RateOption;
}

function findTier(
  quotes: QuoteItem[],
  level: ServiceLevel,
  rate: RateOption,
): QuoteItem | undefined {
  return quotes.find(
    (q) => q.service_level === level && q.rate_option === rate,
  );
}

function SourceBadge({ quote }: { quote: QuoteDetail }) {
  if (quote.source_type === "cache") {
    return (
      <span className="inline-flex items-center gap-1 rounded-sm bg-primary/10 px-2 py-0.5 text-xs text-primary">
        <Database size={12} weight="fill" />
        缓存命中
      </span>
    );
  }
  if (quote.source_type === "stale") {
    return (
      <span className="inline-flex items-center gap-1 rounded-sm bg-amber-100 px-2 py-0.5 text-xs text-warning">
        <ClockClockwise size={12} weight="fill" />
        非实时
      </span>
    );
  }
  return (
    <span className="inline-flex items-center gap-1 rounded-sm bg-green-100 px-2 py-0.5 text-xs text-success">
      <CheckCircle size={12} weight="fill" />
      实时报价
    </span>
  );
}

export function QuoteCard({
  quote,
  defaultLevel = "standard",
  defaultRate = "lowest",
}: QuoteCardProps) {
  const [level, setLevel] = useState<ServiceLevel>(defaultLevel);
  const [rate, setRate] = useState<RateOption>(defaultRate);
  const quotes = quote.quotes ?? [];
  const item = findTier(quotes, level, rate) ?? quotes[0];
  const availableRates = useMemo(
    () =>
      RATE_ORDER.filter((rt) =>
        quotes.some((q) => q.service_level === level && q.rate_option === rt),
      ),
    [quotes, level],
  );

  useEffect(() => {
    if (availableRates.length > 0 && !availableRates.includes(rate)) {
      setRate(availableRates[0]!);
    }
  }, [availableRates, rate]);

  if (!item) {
    return (
      <Card>
        <p className="text-sm text-text-secondary">暂无报价数据</p>
      </Card>
    );
  }

  return (
    <Card className="relative">
      {!quote.is_realtime && (
        <span className="absolute right-4 top-4 rounded-sm bg-amber-100 px-2 py-0.5 text-xs text-warning">
          非实时报价，仅供参考
        </span>
      )}

      <div className="mb-4 flex flex-wrap items-center justify-between gap-2">
        <div className="flex gap-1 rounded-md bg-bg p-1">
          {(["standard", "guaranteed"] as ServiceLevel[]).map((lv) => (
            <button
              key={lv}
              type="button"
              onClick={() => setLevel(lv)}
              className={`rounded-sm px-3 py-1.5 text-sm font-medium transition-colors ${
                level === lv
                  ? "bg-surface text-primary shadow-card"
                  : "text-text-secondary"
              }`}
            >
              {LEVEL_LABEL[lv]}
            </button>
          ))}
        </div>
        <SourceBadge quote={quote} />
      </div>

      <div className="mb-3 flex gap-1 rounded-md bg-bg p-1">
        {availableRates.map((rt) => (
          <button
            key={rt}
            type="button"
            onClick={() => setRate(rt)}
            className={`rounded-sm px-3 py-1.5 text-sm font-medium transition-colors ${
              rate === rt
                ? "bg-surface text-primary shadow-card"
                : "text-text-secondary"
            }`}
          >
            {RATE_LABEL[rt]}
          </button>
        ))}
      </div>

      <div className="flex items-end justify-between gap-4">
        <div>
          <p className="text-sm text-text-secondary">
            {item.carrier} · {item.transit_description}
          </p>
          <p className="mt-1 font-mono text-3xl font-semibold text-text-primary num">
            {formatUSD(item.final_total)}
          </p>
        </div>
        <div className="text-right text-sm text-text-secondary">
          <p>时效 {item.transit_days} 天</p>
          <p className="num">原价 {formatUSD(item.raw_total)}</p>
        </div>
      </div>

      <div className="mt-5 border-t border-border pt-4">
        <p className="mb-2 text-sm font-medium text-text-secondary">价格明细</p>
        <ul className="space-y-1.5 text-sm">
          {item.breakdown.map((b) => (
            <li key={b.item} className="flex justify-between">
              <span className="text-text-secondary">{b.item}</span>
              <span className="num font-mono text-text-primary">
                {formatUSD(b.amount)}
              </span>
            </li>
          ))}
          <li className="flex justify-between border-t border-border pt-1.5 font-medium">
            <span>客户最终价（加价 {formatPercent(item.markup_percent)}）</span>
            <span className="num font-mono text-primary">
              {formatUSD(item.final_total)}
            </span>
          </li>
        </ul>
      </div>

      <p className="mt-3 font-mono text-xs text-text-disabled">
        单号 {quote.quote_id}
      </p>
    </Card>
  );
}