import { Shield, UploadCloud, FileCheck, Loader2, RefreshCw } from 'lucide-react';
import { useState } from 'react';
import { useAppStore, useCurrentProject } from '../../stores/useAppStore';
import { useUIStore } from '../../stores/useUIStore';
import { useChatStore } from '../../stores/useChatStore';

import { ParseDeliveryStandard } from '../../../bindings/engimind/internal/parser/parseservice.js';
import { StreamTemplateDirectory } from '../../../bindings/engimind/internal/chat/chatservice.js';
import { Events } from '@wailsio/runtime';

export function TemplateCard() {
  const currentProject = useCurrentProject();
  const { isParsingTemplate, hasNewTemplatePending, setParsingTemplate, setNewTemplatePending, setEditingOutline } = useUIStore();
  const setProjects = useAppStore(s => s.setProjects);
  const currentProjectId = useAppStore(s => s.currentProjectId);
  const [pendingMarkdown, setPendingMarkdown] = useState('');

  const startTemplateParse = async () => {
    if (!pendingMarkdown) return;

    try {
      setParsingTemplate(true);
      setNewTemplatePending(false);

      const activeModelId = useAppStore.getState().activeModelId;
      if (!activeModelId) {
        alert("提示：请先在配置中心连接一个有效的大语言模型提供商，否则无法进行文件解析！");
        setParsingTemplate(false);
        setNewTemplatePending(true);
        return;
      }

      const cs = useChatStore.getState();
      const userMsgId = Date.now();
      const assistantMsgId = userMsgId + 1;
      const msgIdStr = assistantMsgId.toString();

      cs.addMessage({ id: userMsgId, role: 'user', content: '我上传了一份工程交付文档。请帮我深度解析并归纳出标准大纲结构。' });
      cs.addMessage({ id: assistantMsgId, role: 'assistant', content: '', status: 'processing' });

      let unSub = Events.On("chat_stream_" + msgIdStr, (e: any) => {
        const fullText = Array.isArray(e.data) ? e.data[0] : e.data;
        if (typeof fullText === 'string') {
          const msg = cs.messages.find(m => m.id === assistantMsgId);
          if (msg && fullText.length > msg.content.length) {
            cs.updateMessage(assistantMsgId, { content: fullText });
          }
        }
      });

      // Invoke LLM to extract standard chapters
      let jsonStr = await StreamTemplateDirectory(pendingMarkdown, activeModelId, msgIdStr);
      unSub();
      
      cs.updateMessage(assistantMsgId, { status: 'success' });
      
      let jsonStrClean = jsonStr.replace(/<think>[\s\S]*?<\/think>/g, '').trim();
      jsonStrClean = jsonStrClean.replace(/```json/g, '').replace(/```/g, '').trim();
      
      const startIdx = jsonStrClean.indexOf('[');
      const endIdx = jsonStrClean.lastIndexOf(']');
      if (startIdx !== -1 && endIdx !== -1 && endIdx > startIdx) {
        jsonStrClean = jsonStrClean.substring(startIdx, endIdx + 1);
      }
      
      let parsedChapters;
      try {
        parsedChapters = JSON.parse(jsonStrClean);
      } catch (err) {
        console.error("LLM json decode failed:", jsonStrClean);
        alert("模型解析出的结果不符合要求格式，请重试！\n模型原始输出片段：" + jsonStrClean.substring(0, 100) + "...");
        setParsingTemplate(false);
        setNewTemplatePending(true);
        return;
      }

      if (!Array.isArray(parsedChapters)) {
        parsedChapters = parsedChapters.chapters || parsedChapters.data || [];
        if (!Array.isArray(parsedChapters)) {
          parsedChapters = [parsedChapters];
        }
      }

      const chapters = parsedChapters.map((c: any, i: number) => ({
        id: c.id || `generated-${Date.now()}-${i}`,
        title: c.title || `第${i+1}节 内容生成`,
        status: 'idle',
        progress: 0,
        content: c.content || ''
      }));

      // Update project directory globally
      setProjects(prev => prev.map(p => {
        if (p.id !== currentProjectId) return p;
        return {
          ...p,
          activeTemplate: {
            name: 'AI 深层解析大纲', version: 'v1.0 (Auto)',
            chapters,
          },
        };
      }));

      setParsingTemplate(false);
      setPendingMarkdown('');
      setEditingOutline(true);

    } catch (err: any) {
      console.error(err);
      alert("模型解析遇到错误：" + (err.message || err));
      setParsingTemplate(false);
      setNewTemplatePending(true);
    }
  };

  const handleUploadClick = async () => {
    if (currentProject.activeTemplate.chapters && currentProject.activeTemplate.chapters.length > 0) {
      if (!window.confirm("当前已经存在解析好的交付标准目录，确定要重新上传并替换吗？已有的内容和结构将会被覆盖。")) {
        return;
      }
    }
    
    try {
      const markdownContent = await ParseDeliveryStandard();
      if (markdownContent) {
        setPendingMarkdown(markdownContent);
        setNewTemplatePending(true);
      }
    } catch (error: any) {
      alert("读取或转换文件内容失败: " + (error.message || error));
    }
  };

  return (
    <div className="p-3 mx-2 my-4 mt-auto rounded-[14px] bg-[#F1EFEA]">
      <div className="flex items-center justify-between mb-3 text-[10px] font-medium text-[#8E8B83] uppercase tracking-[0.15em] px-1">
        <div className="flex items-center gap-2"><Shield size={12} className="text-[#2D2D2D]" /> 交付标准</div>
        <button
          onClick={handleUploadClick}
          className="p-1 hover:bg-[#EBE9E4] rounded-md text-[#8E8B83] hover:text-[#2D2D2D] transition-colors"
          title="上传交付标准"
        >
          <UploadCloud size={14} />
        </button>
      </div>
      <div className={`relative p-3 rounded-xl border transition-all duration-300 bg-[#FFFFFF] border-[#E5E4E0] shadow-[0_2px_10px_-4px_rgba(0,0,0,0.05)] ${
        isParsingTemplate ? 'border-[#E5E4E0] animate-pulse ring-1 ring-[#E5E4E0]' : ''
      }`}>
        {isParsingTemplate ? (
          <div className="flex flex-col items-center py-1 gap-2">
            <Loader2 size={16} className="text-[#D97757] animate-spin" />
            <span className="text-[9px] font-medium text-[#D97757] uppercase">AI 解析目录中...</span>
          </div>
        ) : hasNewTemplatePending ? (
          <button
            onClick={startTemplateParse}
            className="w-full py-1.5 bg-[#D97757] text-white rounded-lg text-[11px] font-medium transition-all hover:bg-[#C86444] shadow-sm transform hover:scale-[1.01]"
          >
            开始大模型解析目录
          </button>
        ) : (
          <div className="flex items-start gap-3">
            <FileCheck size={16} className="text-[#8E8B83] mt-0.5" />
            <div className="min-w-0 flex-1">
              <p className="text-[12px] font-medium text-[#2D2D2D] truncate text-left">{currentProject.activeTemplate.name}</p>
              <div className="flex items-center gap-2 mt-1">
                <span className="inline-flex items-center gap-1.5 text-[9px] font-mono text-[#8E8B83]">
                  <span className="w-1.5 h-1.5 rounded-full bg-[#D97757]" />
                  {currentProject.activeTemplate.version} ACTIVE
                </span>
                <RefreshCw size={10} className="text-[#C2C0B8]" />
              </div>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}