/**
 * SSACodeModal - R 代码模态框 (Unified Record Architecture)
 *
 * 从 currentRecord.steps 聚合所有步骤的可复现代码。
 */
import React, { useEffect, useState } from 'react';
import { X, Download, Loader2 } from 'lucide-react';
import { useSSAStore } from '../stores/ssaStore';

export const SSACodeModal: React.FC = () => {
  const {
    codeModalVisible,
    setCodeModalVisible,
    addToast,
    currentRecordId,
    analysisHistory,
    executionMode,
    agentExecution,
  } = useSSAStore();

  const [code, setCode] = useState<string>('');
  const [isLoading, setIsLoading] = useState(false);

  const record = currentRecordId
    ? analysisHistory.find((r) => r.id === currentRecordId) ?? null
    : null;

  useEffect(() => {
    if (!codeModalVisible) return;
    setIsLoading(true);
    try {
      if (executionMode === 'agent' && agentExecution?.generatedCode) {
        const header = `# ========================================\n# Agent 生成的 R 代码\n# 分析任务: ${agentExecution.query || '统计分析'}\n# ========================================\n`;
        setCode(header + agentExecution.generatedCode);
      } else {
        const steps = record?.steps ?? [];
        const successSteps = steps.filter(
          (s) => (s.status === 'success' || s.status === 'warning') && s.result
        );
        if (successSteps.length > 0) {
          const allCode = successSteps
            .map((s) => {
              const stepCode = (s.result as any)?.reproducible_code;
              const header = `# ========================================\n# 步骤 ${s.step_number}: ${s.tool_name}\n# ========================================\n`;
              return header + (stepCode || '# 该步骤暂无可用代码');
            })
            .join('\n\n');
          setCode(allCode);
        } else {
          setCode('# 暂无可用代码\n# 请先执行分析');
        }
      }
    } finally {
      setIsLoading(false);
    }
  }, [codeModalVisible, record, executionMode, agentExecution]);

  if (!codeModalVisible) return null;

  const handleClose = () => setCodeModalVisible(false);

  const generateFilename = () => {
    const now = new Date();
    const pad = (n: number) => n.toString().padStart(2, '0');
    const ts = `${now.getFullYear()}${pad(now.getMonth() + 1)}${pad(now.getDate())}_${pad(now.getHours())}${pad(now.getMinutes())}${pad(now.getSeconds())}`;
    const rawTitle = executionMode === 'agent'
      ? (agentExecution?.query || 'agent_analysis')
      : (record?.plan?.title || 'analysis');
    const title = rawTitle
      .replace(/[^a-zA-Z0-9\u4e00-\u9fa5_-]/g, '_')
      .slice(0, 30);
    return `SSA_${title}_${ts}.R`;
  };

  const handleDownload = () => {
    try {
      const blob = new Blob([code], { type: 'text/plain' });
      const url = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = generateFilename();
      a.click();
      URL.revokeObjectURL(url);
      addToast('R 脚本已下载', 'success');
      handleClose();
    } catch {
      addToast('下载失败', 'error');
    }
  };

  const handleCopy = () => {
    navigator.clipboard.writeText(code);
    addToast('代码已复制', 'success');
  };

  return (
    <div className="code-modal-overlay" onClick={handleClose}>
      <div className="code-modal pop-in" onClick={(e) => e.stopPropagation()}>
        <header className="code-modal-header">
          <h3 className="code-modal-title">
            <span className="r-icon">R</span>
            R 源代码交付
          </h3>
          <button className="code-modal-close" onClick={handleClose}>
            <X size={16} />
          </button>
        </header>

        <div className="code-modal-body">
          {isLoading ? (
            <div className="code-loading">
              <Loader2 size={24} className="spin" />
              <span>加载代码中...</span>
            </div>
          ) : (
            <pre className="code-block">
              <code>{code}</code>
            </pre>
          )}
        </div>

        <footer className="code-modal-footer">
          <button className="copy-btn" onClick={handleCopy} disabled={isLoading}>
            复制代码
          </button>
          <button className="download-btn" onClick={handleDownload} disabled={isLoading}>
            <Download size={14} />
            下载 .R 文件
          </button>
        </footer>
      </div>
    </div>
  );
};

export default SSACodeModal;