import { useState, useRef, useEffect, useCallback, useMemo } from 'react';
import {
  Dialog,
  DialogContent,
  DialogTitle,
  DialogDescription,
} from '@/components/ui/dialog';
import { cn } from '@/lib/utils';
import { kubernetesApi } from '@/api';
import { useToast } from '@/hooks/use-toast';
import type { JsonData } from '@/types/common';
import i18n from '@/i18n';
import {
  type PodLogsViewerProps,
  type LogLine,
  RING_BUFFER_MAX,
} from './pod-logs-viewer/types'; // types.tsx — 含 highlightKeyword JSX 纯函数
import { LogsHeader } from './pod-logs-viewer/LogsHeader';
import { ControlBar } from './pod-logs-viewer/ControlBar';
import { LogContentArea } from './pod-logs-viewer/LogContentArea';
import { BottomStatusBar } from './pod-logs-viewer/BottomStatusBar';

/**
 * 增强版 Pod 日志查看器 — 增强 DeploymentDetail 的日志体验
 *
 * 功能：容器选择 / 实时跟踪（fetch stream） / 行数限制 / previous 日志 /
 * 时间范围 / 关键字过滤（高亮）/ 下载 / 暂停-继续 / 10000 行环形缓冲
 */
export function PodLogsViewer({
  open,
  onOpenChange,
  clusterCode,
  namespace,
  podName,
  containers = [],
  initialContainer,
}: PodLogsViewerProps) {
  const { toast } = useToast();

  const [fullscreen, setFullscreen] = useState(false);
  const [container, setContainer] = useState<string>(initialContainer || containers[0] || '');
  const [tailLines, setTailLines] = useState<number>(500);
  const [previous, setPrevious] = useState(false);
  const [sinceTime, setSinceTime] = useState<string>('');
  const [keyword, setKeyword] = useState('');
  const [autoScroll, setAutoScroll] = useState(true);

  // 流式状态
  const [streaming, setStreaming] = useState(false);
  const [paused, setPaused] = useState(false);
  const [loading, setLoading] = useState(false);

  // 环形缓冲（state 触发渲染，ref 持久存储）
  const [lines, setLines] = useState<LogLine[]>([]);
  const linesRef = useRef<LogLine[]>([]);
  const lineIdRef = useRef(0);
  const abortRef = useRef<AbortController | null>(null);
  const pausedRef = useRef(false);
  const autoScrollRef = useRef(true);
  const scrollRef = useRef<HTMLDivElement>(null);

  useEffect(() => { pausedRef.current = paused; }, [paused]);
  useEffect(() => { autoScrollRef.current = autoScroll; }, [autoScroll]);

  // 重置全屏状态
  useEffect(() => {
    if (!open) setFullscreen(false);
  }, [open]);

  // 容器列表变化时同步默认值
  useEffect(() => {
    if (open && !container && containers.length > 0) {
      setContainer(initialContainer || containers[0]);
    }
  }, [open, containers, initialContainer, container]);

  // 追加行到环形缓冲（批量更新）
  const appendLines = useCallback((newTexts: string[]) => {
    if (newTexts.length === 0) return;
    const next = [...linesRef.current];
    for (const t of newTexts) {
      next.push({ id: ++lineIdRef.current, text: t });
    }
    if (next.length > RING_BUFFER_MAX) {
      linesRef.current = next.slice(next.length - RING_BUFFER_MAX);
    } else {
      linesRef.current = next;
    }
    setLines(linesRef.current);
  }, []);

  // 自动滚动到底部
  useEffect(() => {
    if (autoScrollRef.current && scrollRef.current) {
      scrollRef.current.scrollTop = scrollRef.current.scrollHeight;
    }
  }, [lines]);

  // 停止流
  const stopStream = useCallback(() => {
    if (abortRef.current) {
      abortRef.current.abort();
      abortRef.current = null;
    }
    setStreaming(false);
    setPaused(false);
  }, []);

  // 一次性拉取日志
  const fetchLogs = useCallback(async () => {
    if (!podName) return;
    stopStream();
    setLoading(true);
    linesRef.current = [];
    setLines([]);
    try {
      const res: JsonData = await kubernetesApi.getPodLogsEnhanced(clusterCode, namespace, podName, {
        container: container || undefined,
        tailLines: tailLines,
        previous,
        sinceTime: sinceTime || undefined,
      });
      const raw = res?.logs ?? res?.data?.logs ?? (typeof res === 'string' ? res : '') ?? '';
      const arr = typeof raw === 'string' ? raw.split('\n') : (Array.isArray(raw) ? raw : String(raw).split('\n'));
      appendLines(arr);
    } catch (e) {
      const msg = e instanceof Error ? e.message : String(e);
      appendLines([`\x1b[31m[获取日志失败: ${msg}]\x1b[0m`]);
      toast({ title: i18n.t('k8s.podLogs.loadFailed'), description: msg, variant: 'destructive' });
    } finally {
      setLoading(false);
    }
  }, [clusterCode, namespace, podName, container, tailLines, previous, sinceTime, appendLines, stopStream, toast]);

  // 启动实时流（fetch ReadableStream，tail -f 效果）
  const startStream = useCallback(async () => {
    if (!podName) return;
    stopStream();
    linesRef.current = [];
    setLines([]);
    setLoading(true);
    setStreaming(true);
    setPaused(false);

    const controller = new AbortController();
    abortRef.current = controller;
    const url = kubernetesApi.buildPodLogsStreamUrl(clusterCode, namespace, podName, {
      container: container || undefined,
      tailLines: tailLines,
      previous,
      sinceTime: sinceTime || undefined,
    });
    const token = (await import('@/store')).useUserStore.getState().token || '';

    try {
      const resp = await fetch(url, {
        signal: controller.signal,
        headers: token ? { Authorization: `Bearer ${token}` } : undefined,
      });
      if (!resp.ok || !resp.body) {
        throw new Error(`HTTP ${resp.status}`);
      }
      setLoading(false);
      const reader = resp.body.getReader();
      const decoder = new TextDecoder();
      let buffer = '';

      const flush = () => {
        if (!buffer) return;
        const parts = buffer.split('\n');
        buffer = parts.pop() ?? '';
        if (parts.length > 0) appendLines(parts);
      };

      while (true) {
        const { done, value } = await reader.read();
        if (done) break;
        buffer += decoder.decode(value, { stream: true });
        if (!pausedRef.current) {
          flush();
        } else {
          buffer = '';
        }
      }
      flush();
      appendLines([i18n.t('\\x1b[33m— 流式结束 —\\x1b[0m')]);
    } catch (e) {
      const errName = (e as { name?: string })?.name;
      if (errName === 'AbortError') {
        appendLines([i18n.t('\\x1b[33m— 已停止 —\\x1b[0m')]);
      } else {
        const msg = e instanceof Error ? e.message : String(e);
        appendLines([`\x1b[31m[流式连接中断: ${msg}]\x1b[0m`]);
      }
    } finally {
      setStreaming(false);
      setPaused(false);
      setLoading(false);
      abortRef.current = null;
    }
  }, [clusterCode, namespace, podName, container, tailLines, previous, sinceTime, appendLines, stopStream]);

  // 打开时自动拉取一次
  useEffect(() => {
    if (open && podName) {
      fetchLogs();
    }
    return () => { stopStream(); };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [open, podName]);

  // 参数变化时若正在流则重启
  useEffect(() => {
    if (!open) return;
    if (streaming) {
      startStream();
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [container, tailLines, previous, sinceTime]);

  const handleClose = useCallback(() => {
    stopStream();
    onOpenChange(false);
  }, [stopStream, onOpenChange]);

  // 下载当前（过滤后）日志
  const handleDownload = useCallback(() => {
    const content = filteredLines.map((l) => l.text).join('\n');
    const filename = `${podName}${container ? '-' + container : ''}-${previous ? 'previous-' : ''}${new Date().toISOString().slice(0, 19).replace(/[:T]/g, '')}.log`;
    const blob = new Blob([content], { type: 'text/plain;charset=utf-8' });
    const a = document.createElement('a');
    a.href = URL.createObjectURL(blob);
    a.download = filename;
    a.click();
    URL.revokeObjectURL(a.href);
    toast({ title: i18n.t('monitor.logPanel.exported'), description: filename });
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [podName, container, previous, toast]);

  // 关键字过滤
  const filteredLines = useMemo(() => {
    if (!keyword.trim()) return lines;
    const kw = keyword.trim().toLowerCase();
    return lines.filter((l) => l.text.toLowerCase().includes(kw));
  }, [lines, keyword]);

  const lineCount = lines.length;
  const matchedCount = filteredLines.length;

  return (
    <Dialog open={open} onOpenChange={(o) => { if (!o) handleClose(); }}>
      <DialogContent
        showCloseButton={false}
        onOpenAutoFocus={(e) => e.preventDefault()}
        className={cn(
          'bg-[var(--dg-bg-secondary)] border-[var(--dg-border)] p-0 gap-0',
          '!duration-0 !transition-none',
          fullscreen
            ? '!max-w-none !w-screen !h-screen !rounded-none !translate-x-0 !translate-y-0 !left-0 !top-0'
            : ''
        )}
        style={fullscreen ? { maxWidth: '100vw', width: '100vw', height: '100vh' } : { maxWidth: '1100px', width: '94vw' }}
      >
        <DialogTitle className="sr-only">日志 — {podName}</DialogTitle>
        <DialogDescription className="sr-only">Pod 容器日志查看</DialogDescription>

        <LogsHeader
          podName={podName}
          streaming={streaming}
          paused={paused}
          loading={loading}
          fullscreen={fullscreen}
          lineCount={lineCount}
          matchedCount={matchedCount}
          keyword={keyword}
          onToggleFullscreen={() => setFullscreen(!fullscreen)}
          onClose={handleClose}
        />

        <ControlBar
          containers={containers}
          container={container}
          onContainerChange={setContainer}
          tailLines={tailLines}
          onTailLinesChange={setTailLines}
          previous={previous}
          onPreviousToggle={() => setPrevious(!previous)}
          sinceTime={sinceTime}
          onSinceTimeChange={setSinceTime}
          keyword={keyword}
          onKeywordChange={setKeyword}
          streaming={streaming}
          paused={paused}
          loading={loading}
          filteredLineCount={filteredLines.length}
          onDownload={handleDownload}
          onRefresh={fetchLogs}
          onStartStream={startStream}
          onStopStream={stopStream}
          onPauseToggle={() => setPaused(!paused)}
        />

        <LogContentArea
          filteredLines={filteredLines}
          lineCount={lineCount}
          loading={loading}
          keyword={keyword}
          fullscreen={fullscreen}
          scrollRef={scrollRef}
          autoScrollRef={autoScrollRef}
          onScrollAt={(atBottom) => setAutoScroll(atBottom)}
        />

        <BottomStatusBar
          lineCount={lineCount}
          matchedCount={matchedCount}
          keyword={keyword}
          container={container}
          previous={previous}
          autoScroll={autoScroll}
          onToggleAutoScroll={() => {
            setAutoScroll(!autoScroll);
            if (!autoScroll && scrollRef.current) {
              scrollRef.current.scrollTop = scrollRef.current.scrollHeight;
            }
          }}
        />
      </DialogContent>
    </Dialog>
  );
}