// 主机监控时间范围选择器 — 预设 + 自定义 // Logan.Li
import { useState, useRef, useEffect } from 'react';
import { Calendar, ChevronDown, Timer } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import {
  TIME_RANGE_PRESETS,
  type HostMonitorTimeRange,
  type TimeRangePresetId,
} from './types';
import { presetToRange, toDatetimeLocalValue, formatRangeSummary } from './timeRange';
import { useTranslation } from 'react-i18next';

interface Props {
  value: HostMonitorTimeRange;
  onChange: (range: HostMonitorTimeRange) => void;
}

export function HostTimeRangePicker({ value, onChange }: Props) {
  const { t } = useTranslation();
  const [customOpen, setCustomOpen] = useState(false);
  const now = new Date();
  const [customStart, setCustomStart] = useState(toDatetimeLocalValue(new Date(now.getTime() - 3600_000)));
  const [customEnd, setCustomEnd] = useState(toDatetimeLocalValue(now));
  const popRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const handler = (e: MouseEvent) => {
      if (popRef.current && !popRef.current.contains(e.target as Node)) setCustomOpen(false);
    };
    document.addEventListener('mousedown', handler);
    return () => document.removeEventListener('mousedown', handler);
  }, []);

  const selectPreset = (id: TimeRangePresetId) => {
    if (id === 'custom') return;
    onChange(presetToRange(id));
    setCustomOpen(false);
  };

  const applyCustom = () => {
    const start = new Date(customStart);
    const end = new Date(customEnd);
    if (Number.isNaN(start.getTime()) || Number.isNaN(end.getTime())) return;
    const s = start.getTime() <= end.getTime() ? start : end;
    const e = start.getTime() <= end.getTime() ? end : start;
    onChange({
      preset: 'custom',
      label: t('aiops.providerCustom'),
      start: s.toISOString(),
      end: e.toISOString(),
      buckets: Math.min(120, Math.max(36, Math.ceil((e.getTime() - s.getTime()) / 60_000 / 2))),
    });
    setCustomOpen(false);
  };

  return (
    <div className="flex items-center gap-2 flex-wrap">
      <span className="text-[11px] dg-text-muted hidden sm:inline-flex items-center gap-1">
        <Timer className="h-3 w-3" />
        时间范围
      </span>
      <div className="flex items-center gap-1 rounded-md border border-[var(--dg-border)] p-0.5 bg-[var(--dg-bg-secondary)] flex-wrap">
        {TIME_RANGE_PRESETS.map((p) => (
          <Button
            key={p.id}
            type="button"
            variant="ghost"
            size="sm"
            className={`h-6 text-[11px] px-2 rounded ${value.preset === p.id ? 'dg-btn-primary shadow-sm' : 'dg-text-secondary hover:dg-text-primary'}`}
            onClick={() => selectPreset(p.id)}
          >
            {p.label}
          </Button>
        ))}
        <div className="relative" ref={popRef}>
          <Button
            type="button"
            variant="ghost"
            size="sm"
            className={`h-6 text-[11px] px-2 rounded gap-1 ${value.preset === 'custom' ? 'dg-btn-primary shadow-sm' : 'dg-text-secondary hover:dg-text-primary'}`}
            onClick={() => setCustomOpen((v) => !v)}
          >
            <Calendar className="h-3 w-3" />
            自定义
            <ChevronDown className={`h-3 w-3 transition-transform ${customOpen ? 'rotate-180' : ''}`} />
          </Button>
          {customOpen && (
            <div className="absolute right-0 top-full mt-1 z-50 w-72 rounded-lg border border-[var(--dg-border)] bg-[var(--dg-bg-primary)] p-3 shadow-lg">
              <p className="text-xs font-medium text-[var(--dg-text-primary)] mb-2"> {t('monitor.lbl.unlimited')} </p>
              <div className="space-y-2">
                <div>
                  <label className="text-[10px] dg-text-muted"> {t('common.start')} </label>
                  <Input
                    type="datetime-local"
                    value={customStart}
                    onChange={(e) => setCustomStart(e.target.value)}
                    className="h-8 text-xs dg-input mt-0.5"
                  />
                </div>
                <div>
                  <label className="text-[10px] dg-text-muted"> {t('monitor.lbl.unlimited')} </label>
                  <Input
                    type="datetime-local"
                    value={customEnd}
                    onChange={(e) => setCustomEnd(e.target.value)}
                    className="h-8 text-xs dg-input mt-0.5"
                  />
                </div>
              </div>
              <div className="flex justify-end gap-2 mt-3">
                <Button type="button" variant="ghost" size="sm" className="h-7 text-xs" onClick={() => setCustomOpen(false)}>
                  取消
                </Button>
                <Button type="button" size="sm" className="h-7 text-xs dg-btn-primary" onClick={applyCustom}>
                  应用
                </Button>
              </div>
            </div>
          )}
        </div>
      </div>
      <span className="text-[10px] dg-text-muted tabular-nums hidden md:inline">
        {formatRangeSummary(value)}
      </span>
    </div>
  );
}