# 文件位置: app/routes/api.py
# 文件名: api.py

"""
API路由
处理研究相关的API请求
"""
from flask import Blueprint, request, jsonify, current_app, send_file
from app.services.research_manager import ResearchManager
from app.services.task_manager import task_manager
from app.utils.validators import validate_question, validate_outline_feedback
import os

api_bp = Blueprint('api', __name__)
research_manager = ResearchManager()

@api_bp.route('/research', methods=['POST'])
def create_research():
    """创建新的研究任务"""
    try:
        data = request.get_json()
        
        # 验证输入
        question = data.get('question', '').strip()
        error = validate_question(question)
        if error:
            return jsonify({"error": error}), 400
        
        # 创建研究会话
        session = research_manager.create_session(question)
        
        # 自动开始研究（可选）
        auto_start = data.get('auto_start', True)
        if auto_start:
            result = research_manager.start_research(session.id)
            return jsonify({
                "session_id": session.id,
                "status": "started",
                "message": "研究已开始",
                "created_at": session.created_at.isoformat()
            })
        else:
            return jsonify({
                "session_id": session.id,
                "status": "created",
                "message": "研究会话已创建，等待开始",
                "created_at": session.created_at.isoformat()
            })
            
    except Exception as e:
        current_app.logger.error(f"创建研究失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/research/<session_id>/start', methods=['POST'])
def start_research(session_id):
    """手动开始研究"""
    try:
        result = research_manager.start_research(session_id)
        return jsonify(result)
    except ValueError as e:
        return jsonify({"error": str(e)}), 404
    except Exception as e:
        current_app.logger.error(f"开始研究失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/research/<session_id>/status', methods=['GET'])
def get_research_status(session_id):
    """获取研究状态"""
    try:
        status = research_manager.get_session_status(session_id)
        if "error" in status:
            return jsonify(status), 404
            
        # 添加任务信息
        tasks = task_manager.get_session_tasks(session_id)
        status['tasks'] = tasks
        
        return jsonify(status)
    except Exception as e:
        current_app.logger.error(f"获取状态失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/research/<session_id>/outline', methods=['GET'])
def get_research_outline(session_id):
    """获取研究大纲"""
    try:
        session = research_manager.get_session(session_id)
        if not session:
            return jsonify({"error": "Session not found"}), 404
        
        if not session.outline:
            return jsonify({"error": "Outline not yet created"}), 400
        
        return jsonify({
            "main_topic": session.outline.main_topic,
            "research_questions": session.outline.research_questions,
            "sub_topics": [
                {
                    "id": st.id,
                    "topic": st.topic,
                    "explain": st.explain,
                    "priority": st.priority,
                    "status": st.status
                }
                for st in session.outline.sub_topics
            ],
            "version": session.outline.version
        })
    except Exception as e:
        current_app.logger.error(f"获取大纲失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/research/<session_id>/outline', methods=['PUT'])
def update_research_outline(session_id):
    """更新研究大纲（用户反馈）"""
    try:
        data = request.get_json()
        feedback = data.get('feedback', '').strip()
        
        error = validate_outline_feedback(feedback)
        if error:
            return jsonify({"error": error}), 400
        
        # TODO: 实现大纲更新逻辑
        # 这需要调用AI服务来修改大纲
        
        return jsonify({
            "message": "大纲更新请求已接收",
            "status": "processing"
        })
        
    except Exception as e:
        current_app.logger.error(f"更新大纲失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/research/<session_id>/cancel', methods=['POST'])
def cancel_research(session_id):
    """取消研究"""
    try:
        # 取消任务
        cancelled_count = task_manager.cancel_session_tasks(session_id)
        
        # 更新会话状态
        result = research_manager.cancel_research(session_id)
        if "error" in result:
            return jsonify(result), 404
            
        result['cancelled_tasks'] = cancelled_count
        return jsonify(result)
    except Exception as e:
        current_app.logger.error(f"取消研究失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/research/<session_id>/report', methods=['GET'])
def get_research_report(session_id):
    """获取研究报告"""
    try:
        format = request.args.get('format', 'json')
        
        report_content = research_manager.get_research_report(session_id)
        if not report_content:
            return jsonify({"error": "Report not available"}), 404
        
        if format == 'markdown':
            # 返回Markdown文件
            report_path = os.path.join(
                current_app.config['REPORTS_DIR'], 
                f"{session_id}.md"
            )
            if os.path.exists(report_path):
                return send_file(
                    report_path,
                    mimetype='text/markdown',
                    as_attachment=True,
                    download_name=f"research_report_{session_id}.md"
                )
            else:
                # 临时创建文件
                with open(report_path, 'w', encoding='utf-8') as f:
                    f.write(report_content)
                return send_file(
                    report_path,
                    mimetype='text/markdown',
                    as_attachment=True,
                    download_name=f"research_report_{session_id}.md"
                )
        else:
            # 返回JSON格式
            return jsonify({
                "session_id": session_id,
                "report": report_content,
                "format": "markdown"
            })
            
    except Exception as e:
        current_app.logger.error(f"获取报告失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/research/<session_id>/subtopic/<subtopic_id>', methods=['GET'])
def get_subtopic_detail(session_id, subtopic_id):
    """获取子主题详情"""
    try:
        session = research_manager.get_session(session_id)
        if not session:
            return jsonify({"error": "Session not found"}), 404
        
        if not session.outline:
            return jsonify({"error": "Outline not created"}), 400
        
        # 找到对应的子主题
        subtopic = None
        for st in session.outline.sub_topics:
            if st.id == subtopic_id:
                subtopic = st
                break
        
        if not subtopic:
            return jsonify({"error": "Subtopic not found"}), 404
        
        return jsonify({
            "id": subtopic.id,
            "topic": subtopic.topic,
            "explain": subtopic.explain,
            "priority": subtopic.priority,
            "status": subtopic.status,
            "search_count": subtopic.search_count,
            "max_searches": subtopic.max_searches,
            "progress": subtopic.get_total_searches() / subtopic.max_searches * 100,
            "has_report": subtopic.report is not None
        })
        
    except Exception as e:
        current_app.logger.error(f"获取子主题详情失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/research/sessions', methods=['GET'])
def list_research_sessions():
    """列出所有研究会话"""
    try:
        limit = request.args.get('limit', 20, type=int)
        offset = request.args.get('offset', 0, type=int)
        
        sessions = research_manager.list_sessions(limit=limit, offset=offset)
        
        return jsonify({
            "sessions": sessions,
            "total": len(sessions),
            "limit": limit,
            "offset": offset
        })
        
    except Exception as e:
        current_app.logger.error(f"列出会话失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/tasks/status', methods=['GET'])
def get_tasks_status():
    """获取任务管理器状态"""
    try:
        tasks = task_manager.tasks
        
        status_counts = {
            'pending': 0,
            'running': 0,
            'completed': 0,
            'failed': 0,
            'cancelled': 0
        }
        
        for task in tasks.values():
            status_counts[task.status.value] += 1
        
        return jsonify({
            "total_tasks": len(tasks),
            "status_counts": status_counts,
            "sessions_count": len(task_manager.session_tasks)
        })
        
    except Exception as e:
        current_app.logger.error(f"获取任务状态失败: {e}")
        return jsonify({"error": str(e)}), 500

@api_bp.route('/test/connections', methods=['GET'])
def test_connections():
    """测试API连接（仅开发环境）"""
    if not current_app.debug:
        return jsonify({"error": "Not available in production"}), 403
    
    from app.services.search_service import SearchService
    from app.services.ai_service import AIService
    
    results = {
        "deepseek_api": False,
        "tavily_api": False,
        "task_manager": False
    }
    
    try:
        # 测试DeepSeek API
        ai_service = AIService()
        test_result = ai_service.analyze_question_type("test question")
        results["deepseek_api"] = bool(test_result)
    except Exception as e:
        current_app.logger.error(f"DeepSeek API测试失败: {e}")
    
    try:
        # 测试Tavily API
        search_service = SearchService()
        results["tavily_api"] = search_service.test_connection()
    except Exception as e:
        current_app.logger.error(f"Tavily API测试失败: {e}")
    
    # 测试任务管理器
    try:
        # 提交一个测试任务
        def test_task():
            return "test"
        
        task_id = task_manager.submit_task(test_task)
        status = task_manager.get_task_status(task_id)
        results["task_manager"] = status is not None
    except Exception as e:
        current_app.logger.error(f"任务管理器测试失败: {e}")
    
    return jsonify({
        "connections": results,
        "all_connected": all(results.values())
    })