"use client";

import { useState, useEffect, useRef } from "react";
import Image from "next/image";
import { Button } from "@heroui/react";
import { useApp } from "@/contexts/AppContext";
import { useQuery } from "@tanstack/react-query";
import { useChainId } from "wagmi";
import * as echarts from "echarts";
import { fetchLendingAPYHistory } from "@/lib/api/lending";

type Period = "1W" | "1M" | "1Y";

export default function SupplyContent() {
  const { t } = useApp();
  const chainId = useChainId();
  const [selectedPeriod, setSelectedPeriod] = useState<Period>("1W");
  const chartRef = useRef<HTMLDivElement>(null);
  const chartInstance = useRef<echarts.ECharts | null>(null);

  const { data: apyData, isLoading } = useQuery({
    queryKey: ["lending-apy-history", selectedPeriod, chainId],
    queryFn: () => fetchLendingAPYHistory(selectedPeriod, chainId),
    staleTime: 5 * 60 * 1000,
  });

  const chartData = apyData?.history.map((p) => p.supply_apy) ?? [];
  const xLabels = apyData?.history.map((p) => {
    const d = new Date(p.time);
    if (selectedPeriod === "1W") return `${d.getMonth() + 1}/${d.getDate()} ${String(d.getHours()).padStart(2, "0")}:00`;
    if (selectedPeriod === "1M") return `${d.getMonth() + 1}/${d.getDate()}`;
    return `${d.getFullYear()}/${d.getMonth() + 1}/${d.getDate()}`;
  }) ?? [];

  const currentAPY = apyData?.current_supply_apy ?? 0;
  const apyChange = apyData?.apy_change ?? 0;

  // 初始化 & 销毁（只在 mount/unmount 执行）
  useEffect(() => {
    if (!chartRef.current) return;
    chartInstance.current = echarts.init(chartRef.current);
    const observer = new ResizeObserver(() => chartInstance.current?.resize());
    observer.observe(chartRef.current);
    return () => {
      observer.disconnect();
      chartInstance.current?.dispose();
      chartInstance.current = null;
    };
  }, []);

  // 更新图表数据（period/data 变化时）
  useEffect(() => {
    if (!chartInstance.current) return;

    chartInstance.current.setOption({
      grid: { left: 0, right: 0, top: 10, bottom: 0 },
      tooltip: {
        trigger: "axis",
        show: true,
        confine: true,
        backgroundColor: "rgba(17, 24, 39, 0.9)",
        borderColor: "#374151",
        textStyle: { color: "#f9fafb", fontSize: 12, fontWeight: 500 },
        formatter: (params: any) => {
          const d = params[0];
          return `<div style="padding: 4px 8px;">
            <span style="color: #9ca3af; font-size: 11px;">${d.axisValueLabel}</span><br/>
            <span style="color: #10b981; font-weight: 600; font-size: 14px;">${Number(d.value).toFixed(4)}%</span>
          </div>`;
        },
      },
      xAxis: {
        type: "category",
        data: xLabels,
        axisLine: { show: false },
        axisTick: { show: false },
        axisLabel: {
          show: xLabels.length > 0 && xLabels.length <= 24,
          color: "#9ca3af",
          fontSize: 10,
          fontWeight: 500,
          interval: Math.max(0, Math.floor(xLabels.length / 7) - 1),
        },
      },
      yAxis: {
        type: "value",
        axisLine: { show: false },
        axisTick: { show: false },
        axisLabel: { show: false },
        splitLine: { show: false },
      },
      series: [
        {
          data: chartData,
          type: "line",
          smooth: true,
          symbol: chartData.length <= 30 ? "circle" : "none",
          symbolSize: 4,
          lineStyle: { color: "#10b981", width: 2 },
          itemStyle: { color: "#10b981" },
          areaStyle: {
            color: {
              type: "linear",
              x: 0, y: 0, x2: 0, y2: 1,
              colorStops: [
                { offset: 0, color: "rgba(16, 185, 129, 0.3)" },
                { offset: 1, color: "rgba(16, 185, 129, 0)" },
              ],
            },
          },
        },
      ],
    }, true);
  }, [chartData, xLabels]);

  return (
    <div className="bg-bg-surface dark:bg-gray-800 rounded-3xl border border-border-gray dark:border-gray-700 p-4 md:p-8 flex flex-col gap-4 w-full shadow-md">
      {/* Header */}
      <div className="flex items-center gap-3 flex-shrink-0">
        <Image src="/assets/tokens/usd-coin-usdc-logo-10.svg" alt="USDC" width={32} height={32} />
        <h1 className="text-heading-h2 font-bold text-text-primary dark:text-white leading-[130%] tracking-[-0.01em]">
          {t("supply.usdcLendPool")}
        </h1>
      </div>

      {/* Historical APY Section */}
      <div className="flex items-start justify-between flex-shrink-0">
        {/* Left - APY Display */}
        <div className="flex flex-col gap-1">
          <span className="text-[12px] font-bold text-text-tertiary dark:text-gray-400 leading-[16px] tracking-[1.2px] uppercase">
            {t("supply.historicalApy")}
          </span>
          <div className="flex items-center gap-2">
            <span className="text-heading-h2 font-bold text-[#10b981] dark:text-green-400 leading-[130%] tracking-[-0.01em]">
              {isLoading ? "--" : currentAPY > 0 ? `${currentAPY.toFixed(4)}%` : "--"}
            </span>
            {!isLoading && apyData && apyData.history.length > 1 && (
              <div className={`rounded-full px-2 py-0.5 flex items-center justify-center ${apyChange >= 0 ? "bg-[#e1f8ec] dark:bg-green-900/30" : "bg-red-50 dark:bg-red-900/30"}`}>
                <span className={`text-caption-tiny font-bold leading-[150%] tracking-[0.01em] ${apyChange >= 0 ? "text-[#10b981] dark:text-green-400" : "text-red-500 dark:text-red-400"}`}>
                  {apyChange >= 0 ? "+" : ""}{apyChange.toFixed(4)}%
                </span>
              </div>
            )}
          </div>
        </div>

        {/* Right - Period Selector */}
        <div className="bg-[#F9FAFB] dark:bg-gray-700 rounded-xl p-1 flex items-center gap-1">
          {(["1W", "1M", "1Y"] as Period[]).map((p) => (
            <Button
              key={p}
              size="sm"
              variant={selectedPeriod === p ? "solid" : "light"}
              onPress={() => setSelectedPeriod(p)}
            >
              {p}
            </Button>
          ))}
        </div>
      </div>

      {/* Chart Section — 始终渲染 div，避免 echarts 实例因 DOM 销毁而失效 */}
      <div className="w-full relative" style={{ height: "260px" }}>
        <div
          ref={chartRef}
          className="w-full h-full"
          style={{ background: "linear-gradient(0deg, rgba(16, 185, 129, 0.1) 0%, transparent 100%)" }}
        />
        {/* Loading 遮罩 */}
        {isLoading && (
          <div className="absolute inset-0 flex items-center justify-center bg-white/60 dark:bg-gray-800/60">
            <span className="text-sm text-text-tertiary dark:text-gray-400">{t("common.loading")}</span>
          </div>
        )}
      </div>
    </div>
  );
}