'use client';

import { useMemo } from 'react';
import type { EChartsOption } from 'echarts';
import ReactECharts from 'echarts-for-react';

import { RankChart } from '@/components/data/rank-chart';
import { TrendChart } from '@/components/data/trend-chart';
import { EmptyStateWithBorder } from '@/components/layout/empty';
import { ErrorInline } from '@/components/layout/error';
import { LoadingStateWithBorder } from '@/components/layout/loading';
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { ToggleGroup, ToggleGroupItem } from '@/components/ui/toggle-group';
import type { AccessLogOverview } from '@/lib/services/openflare';
import { formatBytes, formatCompactNumber } from '@/lib/utils/metrics';

import {
  formatOverviewRangeHint,
  formatOverviewTrendLabel,
  OVERVIEW_RANGE_OPTIONS,
  type OverviewRangeHours,
} from './access-log-utils';

function SparklineMetricCard({
  title,
  value,
  hint,
  color,
  fillColor,
  labels,
  values,
  valueFormatter,
}: {
  title: string;
  value: string;
  hint: string;
  color: string;
  fillColor: string;
  labels: string[];
  values: number[];
  valueFormatter?: (value: number) => string;
}) {
  const option = useMemo<EChartsOption>(
    () => ({
      animationDuration: 400,
      grid: {
        left: 0,
        right: 0,
        top: 8,
        bottom: 0,
      },
      xAxis: {
        type: 'category',
        show: false,
        boundaryGap: false,
        data: labels,
      },
      yAxis: {
        type: 'value',
        show: false,
        min: 0,
      },
      tooltip: {
        trigger: 'axis',
        backgroundColor: 'rgba(15, 23, 42, 0.92)',
        borderWidth: 0,
        textStyle: {
          color: '#e2e8f0',
          fontSize: 12,
        },
        formatter: (params: unknown) => {
          const items = Array.isArray(params) ? params : [];
          const item = items[0] as
            { axisValueLabel?: string; value?: number } | undefined;
          if (!item) return '';
          const raw = typeof item.value === 'number' ? item.value : 0;
          const formatted = valueFormatter
            ? valueFormatter(raw)
            : formatCompactNumber(raw);
          return `${item.axisValueLabel ?? ''}<br/>${formatted}`;
        },
      },
      series: [
        {
          type: 'line',
          data: values,
          smooth: true,
          showSymbol: false,
          lineStyle: {
            color,
            width: 2,
          },
          areaStyle: {
            color: fillColor,
          },
        },
      ],
    }),
    [color, fillColor, labels, valueFormatter, values],
  );

  return (
    <Card className='border-dashed shadow-none'>
      <CardContent className='p-4'>
        <div className='flex items-start justify-between gap-3'>
          <div className='min-w-0 space-y-1'>
            <p className='text-[10px] uppercase tracking-wider text-muted-foreground'>
              {title}
            </p>
            <p className='text-2xl font-semibold tracking-tight'>{value}</p>
            <p className='text-[11px] text-muted-foreground'>{hint}</p>
          </div>
          <div className='h-16 w-28 shrink-0 sm:w-36'>
            {labels.length > 0 ? (
              <ReactECharts
                option={option}
                notMerge
                lazyUpdate
                style={{ height: '100%', width: '100%' }}
              />
            ) : null}
          </div>
        </div>
      </CardContent>
    </Card>
  );
}

function RankCard({
  title,
  description,
  items,
  color,
}: {
  title: string;
  description: string;
  items: { label: string; value: number }[];
  color: string;
}) {
  return (
    <Card className='border-dashed shadow-none'>
      <CardHeader className='pb-3'>
        <CardTitle className='text-sm font-semibold text-foreground'>
          {title}
        </CardTitle>
        <CardDescription className='text-xs text-muted-foreground'>
          {description}
        </CardDescription>
      </CardHeader>
      <CardContent className='pt-0'>
        <RankChart
          items={items}
          color={color}
          emptyMessage={`暂无 ${title} 数据`}
        />
      </CardContent>
    </Card>
  );
}

function OverviewRangeSwitch({
  hours,
  onHoursChange,
}: {
  hours: OverviewRangeHours;
  onHoursChange: (hours: OverviewRangeHours) => void;
}) {
  return (
    <div className='flex justify-end'>
      <ToggleGroup
        type='single'
        value={String(hours)}
        onValueChange={(value) => {
          if (!value) return;
          onHoursChange(Number.parseInt(value, 10) as OverviewRangeHours);
        }}
        variant='outline'
        size='sm'
        className='justify-end'
      >
        {OVERVIEW_RANGE_OPTIONS.map((option) => (
          <ToggleGroupItem
            key={option.value}
            value={String(option.value)}
            className='px-2.5 text-xs'
          >
            {option.label}
          </ToggleGroupItem>
        ))}
      </ToggleGroup>
    </div>
  );
}

export function OverviewTab({
  data,
  loading,
  error,
  hours,
  onHoursChange,
  onRetry,
}: {
  data?: AccessLogOverview;
  loading: boolean;
  error: Error | null;
  hours: OverviewRangeHours;
  onHoursChange: (hours: OverviewRangeHours) => void;
  onRetry: () => void;
}) {
  return (
    <div className='space-y-6'>
      <OverviewRangeSwitch hours={hours} onHoursChange={onHoursChange} />

      {loading ? (
        <LoadingStateWithBorder
          title='加载访问概览'
          description='正在聚合请求量、访问量与带宽趋势...'
        />
      ) : error ? (
        <ErrorInline
          message={error.message || '加载访问概览失败'}
          onRetry={onRetry}
        />
      ) : !data ? (
        <EmptyStateWithBorder
          title='暂无概览数据'
          description='当前时间范围内没有可展示的访问统计。'
        />
      ) : (
        <OverviewContent data={data} hours={hours} />
      )}
    </div>
  );
}

function OverviewContent({
  data,
  hours,
}: {
  data: AccessLogOverview;
  hours: number;
}) {
  const requestLabels = data.trends.requests.map((point) =>
    formatOverviewTrendLabel(point.bucket_started_at, hours),
  );
  const requestValues = data.trends.requests.map((point) => point.value);
  const visitValues = data.trends.visits.map((point) => point.value);
  const bandwidthValues = data.trends.bandwidth.map((point) => point.value);
  const hint = formatOverviewRangeHint(hours);

  return (
    <>
      <div className='grid gap-4 lg:grid-cols-3'>
        <SparklineMetricCard
          title='Total Requests'
          value={formatCompactNumber(data.summary.total_requests)}
          hint={hint}
          color='#f59e0b'
          fillColor='rgba(245, 158, 11, 0.18)'
          labels={requestLabels}
          values={requestValues}
        />
        <SparklineMetricCard
          title='Total Visits'
          value={formatCompactNumber(data.summary.total_visits)}
          hint={`${hint} · 独立访客`}
          color='#38bdf8'
          fillColor='rgba(56, 189, 248, 0.16)'
          labels={requestLabels}
          values={visitValues}
        />
        <SparklineMetricCard
          title='Bandwidth Served'
          value={formatBytes(data.summary.bandwidth_served)}
          hint={`${hint} · 已提供数据`}
          color='#34d399'
          fillColor='rgba(52, 211, 153, 0.16)'
          labels={requestLabels}
          values={bandwidthValues}
          valueFormatter={formatBytes}
        />
      </div>

      <Card className='border-dashed shadow-none'>
        <CardHeader>
          <CardTitle className='text-sm font-semibold'>
            Requests over time
          </CardTitle>
          <CardDescription className='text-xs'>
            观察请求量是否出现异常抬升或回落。
          </CardDescription>
        </CardHeader>
        <CardContent>
          <TrendChart
            labels={requestLabels}
            height={280}
            showSummary={false}
            series={[
              {
                label: '请求量',
                color: '#f59e0b',
                fillColor: 'rgba(245, 158, 11, 0.18)',
                variant: 'area',
                values: requestValues,
              },
            ]}
          />
        </CardContent>
      </Card>

      <div className='grid gap-6 xl:grid-cols-3'>
        <RankCard
          title='Top Paths'
          description='访问量最高的请求路径。'
          color='#a78bfa'
          items={data.top_paths.map((item) => ({
            label: item.key,
            value: item.value,
          }))}
        />
        <RankCard
          title='Top Hosts'
          description='流量集中的访问域名。'
          color='#34d399'
          items={data.top_hosts.map((item) => ({
            label: item.key,
            value: item.value,
          }))}
        />
        <RankCard
          title='Top IPs'
          description='请求次数最多的来源 IP。'
          color='#38bdf8'
          items={data.top_ips.map((item) => ({
            label: item.key,
            value: item.value,
          }))}
        />
      </div>
    </>
  );
}