"use client";

import React from "react";
import { useI18n } from "@/hooks/useI18n";
import type { ScanOpportunityRow, ScanTerminalResponse } from "@/lib/dashboard-types";
import { getMarketFocus } from "@/lib/scan-market-focus";

function formatTemperature(value?: number | null, unit?: string | null): string {
  if (value == null || Number.isNaN(Number(value))) return "--";
  return `${Number(value).toFixed(1)}${unit || "°C"}`;
}

function countByRisk(rows: ScanOpportunityRow[]) {
  return rows.reduce(
    (acc, row) => {
      const risk = String(row.risk_level || "").toLowerCase();
      if (risk.includes("high")) acc.high += 1;
      else if (risk.includes("medium")) acc.medium += 1;
      else acc.low += 1;
      return acc;
    },
    { high: 0, medium: 0, low: 0 },
  );
}

export function ScanKPIBar({
  response,
  rows,
  totalCities,
  loading,
}: {
  response: ScanTerminalResponse | null;
  rows: ScanOpportunityRow[];
  totalCities: number;
  loading: boolean;
}) {
  const { locale } = useI18n();
  const isEn = locale === "en-US";
  const riskCounts = countByRisk(rows);
  const tradableRows = rows.filter((row) => row.tradable && !row.closed);
  const liveRows = rows.filter((row) => row.active || row.accepting_orders);
  const bestRow = rows[0] || null;
  const marketFocus = getMarketFocus(rows, locale);
  const statusLabel =
    loading && !response
      ? isEn
        ? "Scanning"
        : "扫描中"
      : response?.status === "stale"
        ? isEn
          ? "Stale"
          : "旧数据"
        : response?.status === "failed"
          ? isEn
            ? "Failed"
            : "失败"
          : isEn
            ? "Live"
            : "最新";

  const cards = [
    {
      label: isEn ? "Scan Status" : "扫描状态",
      value: `${rows.length}/${totalCities || 0}`,
      note:
        loading && response
          ? isEn
            ? "Refreshing latest snapshot"
            : "正在刷新最新快照"
          : response?.status === "stale"
            ? response.stale_reason || (isEn ? "Using last good snapshot" : "正在使用上次成功快照")
            : response?.status === "failed"
              ? response.stale_reason || (isEn ? "No valid snapshot" : "当前没有可用快照")
              : `${isEn ? "Snapshot" : "快照"} · ${statusLabel}`,
      tone: response?.status === "failed" ? "red" : response?.status === "stale" ? "amber" : "cyan",
    },
    {
      label: isEn ? "Book Status" : "盘口状态",
      value: `${liveRows.length}`,
      note: `${isEn ? "Evaluable" : "可评估"} ${tradableRows.length} · ${isEn ? "Pending" : "待评估"} ${Math.max(0, rows.length - tradableRows.length)}`,
      tone: "blue",
    },
    {
      label: isEn ? "Forecast Center" : "预测中枢",
      value: bestRow ? formatTemperature(bestRow.deb_prediction, bestRow.temp_symbol || bestRow.target_unit) : "--",
      note: bestRow
        ? `${isEn ? "Focus" : "焦点"} ${bestRow.city_display_name || bestRow.display_name || bestRow.city} · DEB / ${isEn ? "models" : "模型"} / METAR`
        : isEn
          ? "No active market now"
          : "当前没有活跃市场",
      tone: "green",
    },
    {
      label: isEn ? "Current Region" : "当前主盘",
      value: marketFocus?.label || "--",
      note: marketFocus
        ? isEn
          ? `${marketFocus.stageLabel} · ${marketFocus.activeCityCount || 1} cities in focus`
          : `${marketFocus.stageLabel} · ${marketFocus.activeCityCount || 1} 个城市在焦点窗口`
        : `${isEn ? "Risk" : "风险"} ${riskCounts.high} / ${riskCounts.medium} / ${riskCounts.low}`,
      tone: "orange",
    },
  ];

  return (
    <section className="scan-kpi-bar">
      {cards.map((card) => (
        <article key={card.label} className={`scan-kpi-card ${card.tone}`}>
          <div className="scan-kpi-label">{card.label}</div>
          <div className="scan-kpi-value">{card.value}</div>
          <div className="scan-kpi-note">{card.note}</div>
        </article>
      ))}
    </section>
  );
}