import {
  Activity,
  BadgeDollarSign,
  BrainCircuit,
  ChartNoAxesCombined,
  Gauge,
  Repeat2,
  Sparkles,
  Target,
  Users,
} from "lucide-react";
import { useCallback, useEffect, useState } from "react";
import { adminApi } from "../../api/client";
import type { AnalyticsRate, ProductAnalyticsOverview } from "../../api/types";
import { CohortHeatmap } from "../../components/charts/cohort-heatmap";
import { ComparisonBarChart } from "../../components/charts/comparison-bar-chart";
import { FunnelChart } from "../../components/charts/funnel-chart";
import { Card, ErrorState, LoadingState, PageHeader, StatCard } from "../../components/primitives";
import { RangeControl } from "../../components/range-control";
import { formatNumber } from "../../lib/format";

export function AnalyticsPage() {
  const [range, setRange] = useState("30d");
  const [data, setData] = useState<ProductAnalyticsOverview>();
  const [error, setError] = useState<unknown>();

  const load = useCallback(async () => {
    setError(undefined);
    try {
      setData(await adminApi.productAnalytics(range));
    } catch (requestError) {
      setError(requestError);
    }
  }, [range]);

  useEffect(() => {
    void load();
  }, [load]);

  if (error) return <ErrorState error={error} retry={() => void load()} />;
  if (!data) return <LoadingState label="加载产品数据" />;

  const weeklyGrowth = data.northStar.weekOverWeekPercent;

  return (
    <div className="space-y-6">
      <PageHeader
        eyebrow="CEO Dashboard"
        title="产品增长与留存"
        description="围绕成功使用 AI 的核心价值事件，观察增长质量、留存、消耗与付费。"
        actions={<RangeControl value={range} onChange={setRange} />}
      />

      <section className="grid gap-4 sm:grid-cols-2 xl:grid-cols-4" aria-label="北极星指标">
        <StatCard
          label="周 AI 活跃用户"
          value={formatNumber(data.northStar.weeklyAiActiveUsers)}
          hint={
            weeklyGrowth == null
              ? "暂无可比上周数据"
              : `较上周 ${signedPercent(weeklyGrowth)}`
          }
          icon={Sparkles}
          tone="success"
        />
        <StatCard
          label="24 小时激活率"
          value={rateLabel(data.growth.activation24h)}
          hint={`${formatNumber(data.growth.activation24h.numerator)} / ${formatNumber(data.growth.activation24h.denominator)} 位新用户`}
          icon={Target}
        />
        <StatCard
          label="D7 价值留存"
          value={latestMatureRetention(data, "d7")}
          hint="激活后第 7 天再次成功使用 AI"
          icon={Repeat2}
          tone="violet"
        />
        <StatCard
          label="每活跃用户日均消耗"
          value={optionalNumber(data.consumption.averageDailyCreditsPerActiveUser)}
          hint={`周期总消耗 ${formatNumber(data.consumption.totalCredits)} 积分`}
          icon={Gauge}
          tone="warning"
        />
      </section>

      <section className="grid gap-6 xl:grid-cols-2">
        <Card className="overflow-hidden">
          <SectionHeader
            title="增长激活漏斗"
            description="首次启动到首次 AI 成功，显示逐步及累计转化"
            icon={Target}
          />
          <FunnelChart steps={data.growthFunnel} />
        </Card>
        <Card className="overflow-hidden">
          <SectionHeader
            title="留存 Cohort 热力图"
            description="按首次 AI 成功日分组，未成熟窗口显示为 —"
            icon={ChartNoAxesCombined}
          />
          <CohortHeatmap cohorts={data.retention} />
        </Card>
      </section>

      <section className="grid gap-6 xl:grid-cols-[1.25fr_0.75fr]">
        <Card className="overflow-hidden">
          <SectionHeader
            title="AI 使用结构"
            description="客户端功能与执行模式，仅包含白名单元数据"
            icon={BrainCircuit}
          />
          {data.aiFeatures.length === 0 ? (
            <p className="p-8 text-center text-sm text-muted">等待客户端接入事件后显示</p>
          ) : (
            <ComparisonBarChart
              items={[...data.aiFeatures]
                .sort((left, right) => right.successes - left.successes)
                .map((item) => ({
                  id: `${item.feature}-${item.executionMode}`,
                  label: featureLabel(item.feature),
                  value: item.successes,
                  secondaryValue: item.users,
                  hint: executionModeLabel(item.executionMode),
                }))}
              primaryLabel="成功次数"
              secondaryLabel="成功用户"
              primaryTone="violet"
              secondaryTone="success"
            />
          )}
        </Card>

        <Card className="overflow-hidden">
          <SectionHeader
            title="活跃与消耗"
            description="托管调用以服务端结算为准"
            icon={Activity}
          />
          <ComparisonBarChart
            items={[
              { label: "DAU", value: data.activity.dau },
              { label: "WAU", value: data.activity.wau },
              { label: "MAU", value: data.activity.mau },
            ]}
            primaryLabel="AI 活跃用户"
            primaryTone="success"
          />
          <MetricRows
            rows={[
              ["DAU / MAU", optionalPercent(data.activity.stickinessPercent)],
              ["成功 AI 次数", formatNumber(data.activity.successfulAiRequests)],
              ["人均成功次数", optionalDecimal(data.activity.successfulRequestsPerActiveUser)],
              ["用户日消耗中位数", optionalNumber(data.consumption.medianUserDailyCredits)],
              ["单次托管请求积分", optionalDecimal(data.consumption.averageCreditsPerManagedRequest)],
            ]}
          />
        </Card>
      </section>

      <section className="grid gap-6 xl:grid-cols-3">
        <Card className="overflow-hidden">
          <SectionHeader title="付费转化" description="StoreKit 已验证交易" icon={BadgeDollarSign} />
          <ComparisonBarChart
            items={[
              {
                label: "7 天免费转付费",
                value: data.monetization.conversion7d.percent ?? 0,
              },
              {
                label: "30 天免费转付费",
                value: data.monetization.conversion30d.percent ?? 0,
              },
              {
                label: "复购率",
                value: data.monetization.repeatPurchaseRate.percent ?? 0,
              },
            ]}
            primaryLabel="转化率"
            primaryTone="success"
            valueFormatter={(value) => `${value.toFixed(1)}%`}
          />
          <MetricRows
            rows={[
              ["付费用户", formatNumber(data.monetization.payingUsers)],
              ["购买次数", formatNumber(data.monetization.purchases)],
              ["购买积分", formatNumber(data.monetization.creditsPurchased)],
            ]}
          />
        </Card>

        <Card className="overflow-hidden">
          <SectionHeader
            title="推荐增长漏斗"
            description="分享、打开、绑定、激活与奖励"
            icon={Target}
          />
          <FunnelChart steps={data.referralFunnel} />
        </Card>

        <Card className="overflow-hidden">
          <SectionHeader title="体验护栏" description="避免增长被失败体验抵消" icon={Users} />
          <ComparisonBarChart
            items={[
              {
                label: "客户端 AI",
                value: data.guardrails.clientAiSuccessRate.percent ?? 0,
              },
              {
                label: "托管请求",
                value: data.guardrails.managedSuccessRate.percent ?? 0,
              },
            ]}
            primaryLabel="成功率"
            primaryTone="primary"
            valueFormatter={(value) => `${value.toFixed(1)}%`}
          />
          <MetricRows
            rows={[
              ["积分不足阻断用户", formatNumber(data.guardrails.creditBlockedUsers)],
              ["首次价值耗时中位数", optionalMinutes(data.growth.medianTimeToValueMinutes)],
            ]}
          />
        </Card>
      </section>

      <Card className="overflow-hidden">
        <SectionHeader title="渠道质量" description="新增不是终点，重点比较 24 小时激活" icon={Users} />
        <div className="grid gap-0 xl:grid-cols-[1fr_260px]">
          <ComparisonBarChart
            items={data.growth.channels.map((channel) => ({
              label: channelLabel(channel.channel),
              value: channel.installations,
              secondaryValue: channel.activated,
              hint: `激活率 ${rateLabel(channel.activationRate)}`,
            }))}
            primaryLabel="新增安装"
            secondaryLabel="24 小时激活"
            emptyText="暂无渠道归因数据"
          />
          <MetricRows
            rows={[
              ["新增安装", formatNumber(data.growth.newInstallations)],
              ["新增账号", formatNumber(data.growth.newAccounts)],
              ["整体激活率", rateLabel(data.growth.activation24h)],
            ]}
          />
        </div>
      </Card>
    </div>
  );
}

function SectionHeader({
  title,
  description,
  icon: Icon,
}: {
  title: string;
  description: string;
  icon: typeof Activity;
}) {
  return (
    <div className="flex items-center justify-between border-b border-border px-5 py-5">
      <div>
        <h2 className="text-base font-bold">{title}</h2>
        <p className="mt-1 text-xs text-muted">{description}</p>
      </div>
      <span className="grid size-10 place-items-center rounded-2xl bg-primary-soft text-primary">
        <Icon className="size-4" aria-hidden />
      </span>
    </div>
  );
}

function MetricRows({ rows }: { rows: Array<[string, string]> }) {
  return (
    <dl className="divide-y divide-border">
      {rows.map(([label, value]) => (
        <div className="flex items-center justify-between gap-4 px-5 py-3.5" key={label}>
          <dt className="text-sm text-muted">{label}</dt>
          <dd className="text-right text-sm font-semibold tabular-nums">{value}</dd>
        </div>
      ))}
    </dl>
  );
}

function rateLabel(rate?: AnalyticsRate): string {
  return rate?.percent == null ? "—" : `${rate.percent.toFixed(1)}%`;
}

function optionalPercent(value?: number): string {
  return value == null ? "—" : `${value.toFixed(1)}%`;
}

function optionalDecimal(value?: number): string {
  return value == null ? "—" : value.toFixed(2);
}

function optionalNumber(value?: number): string {
  return value == null ? "—" : formatNumber(Math.round(value));
}

function optionalMinutes(value?: number): string {
  return value == null ? "—" : `${Math.round(value)} 分钟`;
}

function signedPercent(value: number): string {
  return `${value >= 0 ? "+" : ""}${value.toFixed(1)}%`;
}

function latestMatureRetention(
  data: ProductAnalyticsOverview,
  key: "d1" | "d7" | "d30",
): string {
  return rateLabel(data.retention.find((cohort) => cohort[key]?.percent != null)?.[key]);
}

function channelLabel(channel: string): string {
  return {
    APP_STORE_ORGANIC: "App Store 自然量",
    REFERRAL: "用户邀请",
    SOCIAL_CONTENT: "社交 / 内容",
    UNKNOWN: "未知来源",
  }[channel] ?? channel;
}

function featureLabel(feature: string): string {
  return {
    TRANSCRIPTION: "语音转写",
    POLISH: "文字润色",
    AI_ASSISTANT: "AI 助手",
    AGENT: "Agent",
    HOTWORD: "快捷指令",
    OTHER: "其他",
  }[feature] ?? feature;
}

function executionModeLabel(mode: string): string {
  return {
    MANAGED: "托管",
    LOCAL: "本地",
    BYOK: "BYOK",
  }[mode] ?? mode;
}