"use client";

import { useRef, useEffect } from "react";
import ReactECharts from "echarts-for-react";
import type { ECharts } from "echarts";
import { Card as ShadcnCard } from "@/components/ui/card";
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group";
import { Label } from "@/components/ui/label";
import { Skeleton } from "@/components/ui/skeleton";
import { MetricToggle } from "@/components/ui/metric-toggle";
import { useTranslation } from "react-i18next";
import { PieChartOutlined } from "@ant-design/icons";
import { motion } from "framer-motion";

interface ModelUsage {
  model_name: string;
  total_cost: number;
  total_count: number;
}

interface ModelDistributionChartProps {
  loading: boolean;
  models: ModelUsage[];
  metric: "cost" | "count";
  onMetricChange: (metric: "cost" | "count") => void;
}

const getPieOption = (
  models: ModelUsage[],
  metric: "cost" | "count",
  t: (key: string) => string
) => {
  const pieData = models
    .map((item) => ({
      type: item.model_name,
      value: metric === "cost" ? Number(item.total_cost) : item.total_count,
    }))
    .filter((item) => item.value > 0);

  const total = pieData.reduce((sum, item) => sum + item.value, 0);

  const sortedData = [...pieData]
    .sort((a, b) => b.value - a.value)
    .reduce((acc, curr) => {
      const percentage = (curr.value / total) * 100;
      if (percentage < 5) {
        const otherIndex = acc.findIndex(
          (item) => item.name === t("panel.modelUsage.others")
        );
        if (otherIndex >= 0) {
          acc[otherIndex].value += curr.value;
        } else {
          acc.push({
            name: t("panel.modelUsage.others"),
            value: curr.value,
          });
        }
      } else {
        acc.push({
          name: curr.type,
          value: curr.value,
        });
      }
      return acc;
    }, [] as { name: string; value: number }[]);

  const isSmallScreen = window.innerWidth < 640;

  return {
    tooltip: {
      show: true,
      trigger: "item",
      backgroundColor: "rgba(255, 255, 255, 0.98)",
      borderColor: "rgba(0, 0, 0, 0.05)",
      borderWidth: 1,
      padding: [14, 18],
      textStyle: {
        color: "#333",
        fontSize: 13,
        lineHeight: 20,
      },
      formatter: (params: any) => {
        const percentage = ((params.value / total) * 100).toFixed(1);
        return `
          <div class="flex flex-col gap-1.5">
            <div class="font-medium text-gray-800">${params.name}</div>
            <div class="flex items-center gap-2">
              <span class="inline-block w-2 h-2 rounded-full" style="background-color: ${
                params.color
              }"></span>
              <span class="text-sm">
                ${metric === "cost" ? t("panel.byAmount") : t("panel.byCount")}
              </span>
              <span class="font-mono text-sm font-medium text-gray-900">
                ${
                  metric === "cost"
                    ? `${t("common.currency")}${params.value.toFixed(4)}`
                    : `${params.value} ${t("common.count")}`
                }
              </span>
            </div>
            <div class="text-xs text-gray-500">
              占 <span class="font-medium text-gray-700">${percentage}%</span>
            </div>
          </div>
        `;
      },
      extraCssText:
        "box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08); border-radius: 8px;",
    },
    legend: {
      show: true,
      orient: "horizontal",
      bottom: isSmallScreen ? 20 : 10,
      type: "scroll",
      itemWidth: 16,
      itemHeight: 16,
      itemGap: 20,
      textStyle: {
        fontSize: 13,
        color: "#555",
        padding: [0, 0, 0, 4],
      },
      pageIconSize: 12,
      pageTextStyle: {
        color: "#666",
      },
    },
    series: [
      {
        name: metric === "cost" ? t("panel.byAmount") : t("panel.byCount"),
        type: "pie",
        radius: isSmallScreen ? ["35%", "65%"] : ["45%", "75%"],
        center: ["50%", "45%"],
        avoidLabelOverlap: false,
        itemStyle: {
          borderRadius: 6,
          borderWidth: 2,
          borderColor: "#fff",
          shadowBlur: 8,
          shadowColor: "rgba(0, 0, 0, 0.1)",
        },
        label: {
          show: !isSmallScreen,
          position: "outside",
          alignTo: "labelLine",
          margin: 6,
          formatter: (params: any) => {
            const percentage = ((params.value / total) * 100).toFixed(1);
            return [
              `{name|${params.name}}`,
              `{value|${
                metric === "cost"
                  ? `${t("common.currency")}${params.value.toFixed(4)}`
                  : `${params.value} ${t("common.count")}`
              }}`,
              `{per|${percentage}%}`,
            ].join("\n");
          },
          rich: {
            name: {
              fontSize: 13,
              color: "#444",
              padding: [0, 0, 3, 0],
              fontWeight: 500,
              width: 120,
              overflow: "break",
            },
            value: {
              fontSize: 12,
              color: "#666",
              padding: [3, 0],
              fontFamily: "monospace",
            },
            per: {
              fontSize: 12,
              color: "#888",
              padding: [2, 0, 0, 0],
            },
          },
          lineHeight: 16,
        },
        labelLayout: {
          hideOverlap: true,
          moveOverlap: "shiftY",
        },
        labelLine: {
          show: !isSmallScreen,
          length: 20,
          length2: 20,
          minTurnAngle: 90,
          maxSurfaceAngle: 90,
          smooth: true,
        },
        data: sortedData,
        zlevel: 0,
        padAngle: 2,
        emphasis: {
          scale: true,
          scaleSize: 8,
          focus: "self",
          itemStyle: {
            shadowBlur: 16,
            shadowOffsetX: 0,
            shadowColor: "rgba(0, 0, 0, 0.15)",
          },
          label: {
            show: !isSmallScreen,
          },
          labelLine: {
            show: !isSmallScreen,
            lineStyle: {
              width: 2,
            },
          },
        },
        select: {
          disabled: true,
        },
      },
    ],
    graphic: [
      {
        type: "text",
        left: "center",
        top: "40%",
        style: {
          text:
            metric === "cost"
              ? `${t("common.total")}\n${t("common.currency")}${total.toFixed(
                  2
                )}`
              : `${t("common.total")}\n${total}${t("common.count")}`,
          textAlign: "center",
          fontSize: 15,
          fontWeight: "500",
          lineHeight: 22,
          fill: "#333",
        },
        zlevel: 2,
      },
    ],
    animation: true,
    animationDuration: 500,
    universalTransition: true,
  };
};

export default function ModelDistributionChart({
  loading,
  models,
  metric,
  onMetricChange,
}: ModelDistributionChartProps) {
  const chartRef = useRef<ECharts>();
  const { t } = useTranslation("common");

  useEffect(() => {
    const handleResize = () => {
      if (chartRef.current) {
        chartRef.current.resize();
        chartRef.current.setOption(getPieOption(models, metric, t));
      }
    };

    window.addEventListener("resize", handleResize);
    return () => window.removeEventListener("resize", handleResize);
  }, [metric, models, t]);

  return (
    <motion.div
      initial={{ opacity: 0, y: 20 }}
      animate={{ opacity: 1, y: 0 }}
      transition={{ delay: 0.2 }}
      className="col-span-full bg-gradient-to-br from-card to-card/95 text-card-foreground rounded-xl border shadow-sm overflow-hidden"
    >
      <div className="relative">
        <div className="absolute inset-0 bg-gradient-to-r from-primary/5 via-transparent to-primary/5 pointer-events-none" />

        <div className="relative p-6 space-y-6">
          <div className="flex flex-col sm:flex-row sm:items-center gap-3">
            <div className="flex items-center gap-3 flex-1">
              <div className="w-12 h-12 bg-gradient-to-br from-primary/10 to-primary/5 flex items-center justify-center rounded-xl shrink-0">
                <PieChartOutlined className="text-xl text-primary" />
              </div>
              <div className="space-y-1">
                <h3 className="text-2xl font-semibold bg-gradient-to-br from-foreground to-foreground/80 bg-clip-text text-transparent">
                  {t("panel.modelUsage.title")}
                </h3>
              </div>
            </div>
            <div className="sm:ml-auto">
              <MetricToggle value={metric} onChange={onMetricChange} />
            </div>
          </div>

          {loading ? (
            <div className="h-[350px] sm:h-[450px] flex items-center justify-center">
              <Skeleton className="w-full h-full rounded-lg" />
            </div>
          ) : (
            <div className="h-[350px] sm:h-[450px] transition-all duration-300">
              <ReactECharts
                option={getPieOption(models, metric, t)}
                style={{ height: "100%", width: "100%" }}
                onChartReady={(instance) => (chartRef.current = instance)}
              />
            </div>
          )}
        </div>
      </div>
    </motion.div>
  );
}