import type { ReactNode } from "react";

import { Col, Descriptions, Divider, Row, Skeleton, Space, Statistic } from "tdesign-react";

import type { TargetMetricsResponse, TargetStatus } from "../../shared/api";

import { formatDurationUnit } from "../utils/time";
import { TrendChart } from "./TrendChart";

interface OverviewStatItemProps {
  color?: string;
  suffix?: ReactNode;
  title: string;
  value: number;
}

interface OverviewTabProps {
  metricsData: null | TargetMetricsResponse;
  metricsLoading: boolean;
  target: TargetStatus;
}

export function OverviewTab({ metricsData, metricsLoading, target }: OverviewTabProps) {
  const stats = metricsData?.stats ?? null;
  const mttr = formatDurationUnit(stats?.mttr ?? null);
  const longestOutage = formatDurationUnit(stats?.longestOutage ?? null);
  const currentUpStreak = stats?.currentStreak?.up ? stats.currentStreak.count : 0;

  return (
    <Space className="full-width" direction="vertical" size={16}>
      <Divider align="left">基本信息</Divider>
      <Descriptions
        items={[
          { content: target.target, label: "目标地址" },
          { content: target.interval, label: "检查间隔" },
          {
            content: target.latestCheck ? new Date(target.latestCheck.timestamp).toLocaleString("zh-CN") : "-",
            label: "最新检查时间",
          },
          { content: target.latestCheck?.statusDetail ?? "-", label: "状态详情" },
        ]}
      />

      <Divider align="left">统计</Divider>
      {metricsLoading ? (
        <Skeleton animation="gradient" />
      ) : stats ? (
        <Row gutter={[16, 16]}>
          <Col span={3}>
            <OverviewStatItem color="green" suffix="%" title="可用率" value={stats.availability} />
          </Col>
          <Col span={3}>
            <OverviewStatItem
              suffix={stats.avgDurationMs === null ? "" : "ms"}
              title="平均延迟"
              value={stats.avgDurationMs ?? 0}
            />
          </Col>
          <Col span={3}>
            <OverviewStatItem
              suffix={stats.p95DurationMs === null ? "" : "ms"}
              title="P95 延迟"
              value={stats.p95DurationMs ?? 0}
            />
          </Col>
          <Col span={3}>
            <OverviewStatItem color="blue" title="检查总数" value={stats.totalChecks} />
          </Col>
          <Col span={3}>
            <OverviewStatItem suffix={mttr.suffix} title="MTTR" value={mttr.value} />
          </Col>
          <Col span={3}>
            <OverviewStatItem suffix={longestOutage.suffix} title="最长故障" value={longestOutage.value} />
          </Col>
          <Col span={3}>
            <OverviewStatItem color="red" suffix="次" title="故障次数" value={stats.incidentCount} />
          </Col>
          <Col span={3}>
            <OverviewStatItem color="green" suffix="次" title="连续正常" value={currentUpStreak} />
          </Col>
        </Row>
      ) : (
        <div className="trend-empty">暂无指标数据</div>
      )}

      <Divider align="left">趋势</Divider>
      {metricsLoading ? (
        <Skeleton animation="gradient" />
      ) : metricsData ? (
        <TrendChart data={metricsData.trend} />
      ) : (
        <div className="trend-empty">暂无趋势数据</div>
      )}
    </Space>
  );
}

function OverviewStatItem({ color, suffix, title, value }: OverviewStatItemProps) {
  return (
    <div className="overview-stat-card summary-stat-col">
      <Statistic color={color} suffix={suffix} title={title} value={value} />
    </div>
  );
}