import { useMemo, useState } from "react";
import { useTranslation } from "react-i18next";
import { UsageHero } from "./UsageHero";
import { UsageTrendChart } from "./UsageTrendChart";
import { RequestLogTable } from "./RequestLogTable";
import { ProviderStatsTable } from "./ProviderStatsTable";
import { ModelStatsTable } from "./ModelStatsTable";
import {
  KNOWN_APP_TYPES,
  type AppTypeFilter,
  type UsageRangeSelection,
} from "@/types/usage";
import { motion } from "framer-motion";
import {
  BarChart3,
  ListFilter,
  Activity,
  RefreshCw,
  Coins,
} from "lucide-react";
import { Button } from "@/components/ui/button";
import { useQueryClient } from "@tanstack/react-query";
import { usageKeys } from "@/lib/query/usage";
import { useUsageEventBridge } from "@/hooks/useUsageEventBridge";
import {
  Accordion,
  AccordionContent,
  AccordionItem,
  AccordionTrigger,
} from "@/components/ui/accordion";
import { PricingConfigPanel } from "@/components/usage/PricingConfigPanel";
import { cn } from "@/lib/utils";
import { getLocaleFromLanguage } from "./format";
import { getUsageRangePresetLabel, resolveUsageRange } from "@/lib/usageRange";
import { UsageDateRangePicker } from "./UsageDateRangePicker";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";

const APP_FILTER_OPTIONS: AppTypeFilter[] = ["all", ...KNOWN_APP_TYPES];

export function UsageDashboard() {
  const { t, i18n } = useTranslation();
  const queryClient = useQueryClient();
  const [range, setRange] = useState<UsageRangeSelection>({ preset: "today" });
  const [appType, setAppType] = useState<AppTypeFilter>("all");
  const [refreshIntervalMs, setRefreshIntervalMs] = useState(30000);

  // 后端写入新日志时 emit `usage-log-recorded`，本 hook 立刻 invalidate 所有
  // usage 查询，实现实时刷新（仅在 Dashboard 挂载时生效，离开页面自动取消监听）
  useUsageEventBridge();

  const refreshIntervalOptionsMs = [0, 5000, 10000, 30000, 60000] as const;
  const changeRefreshInterval = () => {
    const currentIndex = refreshIntervalOptionsMs.indexOf(
      refreshIntervalMs as (typeof refreshIntervalOptionsMs)[number],
    );
    const safeIndex = currentIndex >= 0 ? currentIndex : 3;
    const nextIndex = (safeIndex + 1) % refreshIntervalOptionsMs.length;
    const next = refreshIntervalOptionsMs[nextIndex];
    setRefreshIntervalMs(next);
    queryClient.invalidateQueries({ queryKey: usageKeys.all });
  };

  const language = i18n.resolvedLanguage || i18n.language || "en";
  const locale = getLocaleFromLanguage(language);
  const resolvedRange = useMemo(() => resolveUsageRange(range), [range]);
  const rangeLabel = useMemo(() => {
    if (range.preset !== "custom") {
      return getUsageRangePresetLabel(range.preset, t);
    }

    return `${new Date(resolvedRange.startDate * 1000).toLocaleString(locale)} - ${new Date(
      resolvedRange.endDate * 1000,
    ).toLocaleString(locale)}`;
  }, [locale, range, resolvedRange.endDate, resolvedRange.startDate, t]);

  return (
    <motion.div
      initial={{ opacity: 0, y: 10 }}
      animate={{ opacity: 1, y: 0 }}
      transition={{ duration: 0.4 }}
      className="space-y-8 pb-8"
    >
      <div className="flex flex-col lg:flex-row lg:items-end justify-between gap-4 mb-2">
        <div className="flex flex-col gap-1">
          <h2 className="text-2xl font-bold tracking-tight">
            {t("usage.title")}
          </h2>
          <p className="text-sm text-muted-foreground">{t("usage.subtitle")}</p>
        </div>

        <div className="flex flex-wrap items-center gap-2">
          <div className="flex items-center p-1 bg-muted/30 rounded-lg border border-border/50">
            {APP_FILTER_OPTIONS.map((type) => (
              <button
                key={type}
                type="button"
                onClick={() => setAppType(type)}
                className={cn(
                  "px-3 py-1.5 rounded-md text-sm font-medium transition-all",
                  appType === type
                    ? "bg-background text-primary shadow-sm"
                    : "text-muted-foreground hover:text-foreground hover:bg-muted/50",
                )}
              >
                {t(`usage.appFilter.${type}`)}
              </button>
            ))}
          </div>

          <div className="flex items-center gap-2 ml-auto lg:ml-0">
            <Button
              type="button"
              variant="outline"
              size="sm"
              className="h-9 px-3 text-xs"
              title={t("common.refresh", "刷新")}
              onClick={changeRefreshInterval}
            >
              <RefreshCw className="mr-2 h-3.5 w-3.5" />
              {refreshIntervalMs > 0 ? `${refreshIntervalMs / 1000}s` : "--"}
            </Button>

            <UsageDateRangePicker
              selection={range}
              triggerLabel={rangeLabel}
              onApply={(nextRange) => setRange(nextRange)}
            />
          </div>
        </div>
      </div>

      <UsageHero
        range={range}
        appType={appType === "all" ? undefined : appType}
        refreshIntervalMs={refreshIntervalMs}
      />

      <UsageTrendChart
        range={range}
        rangeLabel={rangeLabel}
        appType={appType}
        refreshIntervalMs={refreshIntervalMs}
      />

      <div className="space-y-4">
        <Tabs defaultValue="logs" className="w-full">
          <div className="flex items-center justify-between mb-4">
            <TabsList className="bg-muted/50">
              <TabsTrigger value="logs" className="gap-2">
                <ListFilter className="h-4 w-4" />
                {t("usage.requestLogs")}
              </TabsTrigger>
              <TabsTrigger value="providers" className="gap-2">
                <Activity className="h-4 w-4" />
                {t("usage.providerStats")}
              </TabsTrigger>
              <TabsTrigger value="models" className="gap-2">
                <BarChart3 className="h-4 w-4" />
                {t("usage.modelStats")}
              </TabsTrigger>
            </TabsList>
          </div>

          <motion.div
            initial={{ opacity: 0, y: 10 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{ delay: 0.2 }}
          >
            <TabsContent value="logs" className="mt-0">
              <RequestLogTable
                range={range}
                rangeLabel={rangeLabel}
                appType={appType}
                refreshIntervalMs={refreshIntervalMs}
                onRangeChange={setRange}
              />
            </TabsContent>

            <TabsContent value="providers" className="mt-0">
              <ProviderStatsTable
                range={range}
                appType={appType}
                refreshIntervalMs={refreshIntervalMs}
              />
            </TabsContent>

            <TabsContent value="models" className="mt-0">
              <ModelStatsTable
                range={range}
                appType={appType}
                refreshIntervalMs={refreshIntervalMs}
              />
            </TabsContent>
          </motion.div>
        </Tabs>
      </div>

      <Accordion type="multiple" defaultValue={[]} className="w-full space-y-4">
        <AccordionItem
          value="pricing"
          className="rounded-xl glass-card overflow-hidden"
        >
          <AccordionTrigger className="px-6 py-4 hover:no-underline hover:bg-muted/50 data-[state=open]:bg-muted/50">
            <div className="flex items-center gap-3">
              <Coins className="h-5 w-5 text-yellow-500" />
              <div className="text-left">
                <h3 className="text-base font-semibold">
                  {t("settings.advanced.pricing.title")}
                </h3>
                <p className="text-sm text-muted-foreground font-normal">
                  {t("settings.advanced.pricing.description")}
                </p>
              </div>
            </div>
          </AccordionTrigger>
          <AccordionContent className="px-6 pb-6 pt-4 border-t border-border/50">
            <PricingConfigPanel />
          </AccordionContent>
        </AccordionItem>
      </Accordion>
    </motion.div>
  );
}