import { useEffect } from 'react';
import { createPortal } from 'react-dom';
import { X, Terminal, Clock, Maximize2 } from 'lucide-react';
import ReactMarkdown from 'react-markdown';
import remarkGfm from 'remark-gfm';

// 模块级常量：保持引用稳定，避免每次渲染重建数组
const REMARK_PLUGINS = [remarkGfm];

interface ToolDetailModalProps {
  toolName: string;
  status: string;
  statusLabel: string;
  arguments?: unknown;
  resultContent: string;
  callContent: string;
  durationMs?: number;
  onClose: () => void;
}

function formatDuration(ms: number): string {
  if (ms < 1000) return `${ms}ms`;
  if (ms < 60000) return `${(ms / 1000).toFixed(1)}s`;
  const minutes = Math.floor(ms / 60000);
  const seconds = Math.floor((ms % 60000) / 1000);
  return `${minutes}m ${seconds}s`;
}

function formatJSON(text: string): string {
  if (!text) return '';
  try {
    const parsed = JSON.parse(text);
    return JSON.stringify(parsed, null, 2);
  } catch {
    return text;
  }
}

export function ToolDetailModal({
  toolName,
  status,
  statusLabel,
  arguments: args,
  resultContent,
  callContent,
  durationMs,
  onClose,
}: ToolDetailModalProps) {
  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    document.addEventListener('keydown', handleKeyDown);
    return () => document.removeEventListener('keydown', handleKeyDown);
  }, [onClose]);

  const displayContent = resultContent || callContent;
  const formattedContent = formatJSON(displayContent);

  const statusColor =
    status === 'calling'
      ? 'var(--accent-amber)'
      : status === 'result'
        ? 'var(--accent-green)'
        : status === 'pending'
          ? 'var(--accent-amber)'
          : 'var(--text-muted)';

  // portal 到 body：在虚拟化消息行内打开时，行元素的 transform 会成为
  // fixed 后代的包含块，遮罩/定位全部失效（同 ImageLightbox）。
  // z-[10000]：高于下拉选择器（z-[9999]）等全局浮层。
  return createPortal(
    <div
      className="fixed inset-0 z-[10000] flex items-center justify-center bg-black/80 backdrop-blur-sm animate-fade-in"
      onClick={onClose}
    >
      {/* Modal container */}
      <div
        className="relative w-[90vw] max-w-4xl max-h-[90vh] rounded-2xl border border-[var(--border-color)] bg-[var(--bg-secondary)] shadow-2xl flex flex-col overflow-hidden animate-scale-in"
        onClick={(e) => e.stopPropagation()}
      >
        {/* Header */}
        <div className="flex items-center gap-3 shrink-0 px-6 py-4 border-b border-[var(--border-color)] bg-[var(--bg-tertiary)]/50">
          <div className="flex items-center gap-2.5">
            <Terminal className="h-5 w-5 text-[var(--accent-cyan)]" />
            <span className="text-lg font-semibold text-[var(--text-primary)]">{toolName}</span>
          </div>
          <span
            className="px-2.5 py-1 rounded-full text-sm font-medium"
            style={{
              backgroundColor: `color-mix(in srgb, ${statusColor} 12%, transparent)`,
              color: statusColor,
              border: `1px solid color-mix(in srgb, ${statusColor} 25%, transparent)`,
            }}
          >
            {statusLabel}
          </span>
          {durationMs != null && (
            <span className="flex items-center gap-1.5 text-sm text-[var(--text-muted)]">
              <Clock className="h-4 w-4" />
              {formatDuration(durationMs)}
            </span>
          )}
          <button
            onClick={onClose}
            className="ml-auto p-2 rounded-lg text-[var(--text-muted)] hover:text-[var(--text-primary)] hover:bg-[var(--overlay-hover)] transition-colors"
            aria-label="关闭"
            title="关闭 (Esc)"
          >
            <X className="h-5 w-5" />
          </button>
        </div>

        {/* Body — scrollable */}
        <div className="flex-1 overflow-y-auto p-6 space-y-5">
          {/* Arguments */}
          {args !== undefined && args !== null && (
            <div>
              <div className="text-base font-semibold text-[var(--text-primary)] mb-2 flex items-center gap-2">
                <span className="w-1 h-5 rounded-full bg-[var(--accent-cyan)] inline-block" />
                参数
              </div>
              <pre className="text-base leading-relaxed text-[var(--text-secondary)] font-mono whitespace-pre-wrap bg-[var(--overlay-dim)] rounded-xl p-4 overflow-x-auto border border-[var(--border-color)]">
                {JSON.stringify(args, null, 2)}
              </pre>
            </div>
          )}

          {/* Result / Output */}
          {displayContent && (
            <div>
              <div className="text-base font-semibold text-[var(--text-primary)] mb-2 flex items-center gap-2">
                <span className="w-1 h-5 rounded-full bg-[var(--accent-green)] inline-block" />
                {resultContent ? '结果' : '输出'}
              </div>
              <div className="text-base leading-relaxed text-[var(--text-secondary)] font-mono whitespace-pre-wrap bg-[var(--overlay-dim)] rounded-xl p-4 overflow-x-auto border border-[var(--border-color)] markdown-content">
                <ReactMarkdown remarkPlugins={REMARK_PLUGINS}>{formattedContent}</ReactMarkdown>
              </div>
            </div>
          )}
        </div>

        {/* Footer */}
        <div className="shrink-0 px-6 py-3 border-t border-[var(--border-color)] bg-[var(--bg-tertiary)]/30 flex items-center justify-between text-sm text-[var(--text-muted)]">
          <span>按 Esc 关闭</span>
          <span className="flex items-center gap-1">
            <Maximize2 className="h-3.5 w-3.5" />
            放大视图
          </span>
        </div>
      </div>
    </div>,
    document.body,
  );
}