"""
Report Engine Flask接口
提供HTTP API用于报告生成
"""

import os
import json
import threading
import time
from datetime import datetime
from flask import Blueprint, request, jsonify, Response
from typing import Dict, Any

from .agent import ReportAgent, create_agent
from .utils.config import load_config


# 创建Blueprint
report_bp = Blueprint('report_engine', __name__)

# 全局变量
report_agent = None
current_task = None
task_lock = threading.Lock()


def initialize_report_engine():
    """初始化Report Engine"""
    global report_agent
    try:
        config = load_config()
        report_agent = create_agent()
        print("Report Engine初始化成功")
        return True
    except Exception as e:
        print(f"Report Engine初始化失败: {str(e)}")
        return False


class ReportTask:
    """报告生成任务"""
    
    def __init__(self, query: str, task_id: str):
        self.task_id = task_id
        self.query = query
        self.status = "pending"  # pending, running, completed, error
        self.progress = 0
        self.result = None
        self.error_message = ""
        self.created_at = datetime.now()
        self.updated_at = datetime.now()
        self.html_content = ""
        
    def update_status(self, status: str, progress: int = None, error_message: str = ""):
        """更新任务状态"""
        self.status = status
        if progress is not None:
            self.progress = progress
        if error_message:
            self.error_message = error_message
        self.updated_at = datetime.now()
    
    def to_dict(self) -> Dict[str, Any]:
        """转换为字典格式"""
        return {
            'task_id': self.task_id,
            'query': self.query,
            'status': self.status,
            'progress': self.progress,
            'error_message': self.error_message,
            'created_at': self.created_at.isoformat(),
            'updated_at': self.updated_at.isoformat(),
            'has_result': bool(self.html_content)
        }


def check_engines_ready() -> Dict[str, Any]:
    """检查三个子引擎是否都有新文件"""
    directories = {
        'insight': 'insight_engine_streamlit_reports',
        'media': 'media_engine_streamlit_reports', 
        'query': 'query_engine_streamlit_reports'
    }
    
    forum_log_path = 'logs/forum.log'
    
    if not report_agent:
        return {
            'ready': False,
            'error': 'Report Engine未初始化'
        }
    
    return report_agent.check_input_files(
        directories['insight'],
        directories['media'], 
        directories['query'],
        forum_log_path
    )


def run_report_generation(task: ReportTask, query: str):
    """在后台线程中运行报告生成"""
    global current_task
    
    try:
        task.update_status("running", 10)
        
        # 检查输入文件
        check_result = check_engines_ready()
        if not check_result['ready']:
            task.update_status("error", 0, f"输入文件未准备就绪: {check_result.get('missing_files', [])}")
            return
        
        task.update_status("running", 30)
        
        # 加载输入文件
        content = report_agent.load_input_files(check_result['latest_files'])
        
        task.update_status("running", 50)
        
        # 生成报告
        html_report = report_agent.generate_report(
            query=query,
            reports=content['reports'],
            forum_logs=content['forum_logs'],
            save_report=True
        )
        
        task.update_status("running", 90)
        
        # 保存结果
        task.html_content = html_report
        task.update_status("completed", 100)
        
    except Exception as e:
        task.update_status("error", 0, str(e))
        # 只在出错时清理任务
        with task_lock:
            if current_task and current_task.task_id == task.task_id:
                current_task = None


@report_bp.route('/status', methods=['GET'])
def get_status():
    """获取Report Engine状态"""
    try:
        engines_status = check_engines_ready()
        
        return jsonify({
            'success': True,
            'initialized': report_agent is not None,
            'engines_ready': engines_status['ready'],
            'files_found': engines_status.get('files_found', []),
            'missing_files': engines_status.get('missing_files', []),
            'current_task': current_task.to_dict() if current_task else None
        })
    except Exception as e:
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500


@report_bp.route('/generate', methods=['POST'])
def generate_report():
    """开始生成报告"""
    global current_task
    
    try:
        # 检查是否有任务在运行
        with task_lock:
            if current_task and current_task.status == "running":
                return jsonify({
                    'success': False,
                    'error': '已有报告生成任务在运行中',
                    'current_task': current_task.to_dict()
                }), 400
            
            # 如果有已完成的任务，清理它
            if current_task and current_task.status in ["completed", "error"]:
                current_task = None
        
        # 获取请求参数
        data = request.get_json() or {}
        query = data.get('query', '智能舆情分析报告')
        
        # 清空日志文件
        clear_report_log()
        
        # 检查Report Engine是否初始化
        if not report_agent:
            return jsonify({
                'success': False,
                'error': 'Report Engine未初始化'
            }), 500
        
        # 检查输入文件是否准备就绪
        engines_status = check_engines_ready()
        if not engines_status['ready']:
            return jsonify({
                'success': False,
                'error': '输入文件未准备就绪',
                'missing_files': engines_status.get('missing_files', [])
            }), 400
        
        # 创建新任务
        task_id = f"report_{int(time.time())}"
        task = ReportTask(query, task_id)
        
        with task_lock:
            current_task = task
        
        # 在后台线程中运行报告生成
        thread = threading.Thread(
            target=run_report_generation,
            args=(task, query),
            daemon=True
        )
        thread.start()
        
        return jsonify({
            'success': True,
            'task_id': task_id,
            'message': '报告生成已启动',
            'task': task.to_dict()
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500


@report_bp.route('/progress/<task_id>', methods=['GET'])
def get_progress(task_id: str):
    """获取报告生成进度"""
    try:
        if not current_task or current_task.task_id != task_id:
            # 如果任务不存在，可能是已经完成并被清理了
            # 返回一个默认的完成状态而不是404
            return jsonify({
                'success': True,
                'task': {
                    'task_id': task_id,
                    'status': 'completed',
                    'progress': 100,
                    'error_message': '',
                    'has_result': True
                }
            })
        
        return jsonify({
            'success': True,
            'task': current_task.to_dict()
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500


@report_bp.route('/result/<task_id>', methods=['GET'])
def get_result(task_id: str):
    """获取报告生成结果"""
    try:
        if not current_task or current_task.task_id != task_id:
            return jsonify({
                'success': False,
                'error': '任务不存在'
            }), 404
        
        if current_task.status != "completed":
            return jsonify({
                'success': False,
                'error': '报告尚未完成',
                'task': current_task.to_dict()
            }), 400
        
        return Response(
            current_task.html_content,
            mimetype='text/html'
        )
        
    except Exception as e:
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500


@report_bp.route('/result/<task_id>/json', methods=['GET'])
def get_result_json(task_id: str):
    """获取报告生成结果（JSON格式）"""
    try:
        if not current_task or current_task.task_id != task_id:
            return jsonify({
                'success': False,
                'error': '任务不存在'
            }), 404
        
        if current_task.status != "completed":
            return jsonify({
                'success': False,
                'error': '报告尚未完成',
                'task': current_task.to_dict()
            }), 400
        
        return jsonify({
            'success': True,
            'task': current_task.to_dict(),
            'html_content': current_task.html_content
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500


@report_bp.route('/cancel/<task_id>', methods=['POST'])
def cancel_task(task_id: str):
    """取消报告生成任务"""
    global current_task
    
    try:
        with task_lock:
            if current_task and current_task.task_id == task_id:
                if current_task.status == "running":
                    current_task.update_status("cancelled", 0, "用户取消任务")
                current_task = None
                
                return jsonify({
                    'success': True,
                    'message': '任务已取消'
                })
            else:
                return jsonify({
                    'success': False,
                    'error': '任务不存在或无法取消'
                }), 404
                
    except Exception as e:
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500


@report_bp.route('/templates', methods=['GET'])
def get_templates():
    """获取可用模板列表"""
    try:
        if not report_agent:
            return jsonify({
                'success': False,
                'error': 'Report Engine未初始化'
            }), 500
        
        template_dir = report_agent.config.template_dir
        templates = []
        
        if os.path.exists(template_dir):
            for filename in os.listdir(template_dir):
                if filename.endswith('.md'):
                    template_path = os.path.join(template_dir, filename)
                    try:
                        with open(template_path, 'r', encoding='utf-8') as f:
                            content = f.read()
                        
                        templates.append({
                            'name': filename.replace('.md', ''),
                            'filename': filename,
                            'description': content.split('\n')[0] if content else '无描述',
                            'size': len(content)
                        })
                    except Exception as e:
                        print(f"读取模板失败 {filename}: {str(e)}")
        
        return jsonify({
            'success': True,
            'templates': templates,
            'template_dir': template_dir
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500


# 错误处理
@report_bp.errorhandler(404)
def not_found(error):
    return jsonify({
        'success': False,
        'error': 'API端点不存在'
    }), 404


@report_bp.errorhandler(500)
def internal_error(error):
    return jsonify({
        'success': False,
        'error': '服务器内部错误'
    }), 500


def clear_report_log():
    """清空report.log文件"""
    try:
        config = load_config()
        log_file = config.log_file
        with open(log_file, 'w', encoding='utf-8') as f:
            f.write('')
        print(f"已清空日志文件: {log_file}")
    except Exception as e:
        print(f"清空日志文件失败: {str(e)}")


@report_bp.route('/log', methods=['GET'])
def get_report_log():
    """获取report.log内容"""
    try:
        config = load_config()
        log_file = config.log_file
        
        if not os.path.exists(log_file):
            return jsonify({
                'success': True,
                'log_lines': []
            })
        
        with open(log_file, 'r', encoding='utf-8') as f:
            lines = f.readlines()
        
        # 清理行尾的换行符
        log_lines = [line.rstrip('\n\r') for line in lines if line.strip()]
        
        return jsonify({
            'success': True,
            'log_lines': log_lines
        })
        
    except Exception as e:
        return jsonify({
            'success': False,
            'error': f'读取日志失败: {str(e)}'
        }), 500


@report_bp.route('/log/clear', methods=['POST'])
def clear_log():
    """手动清空日志"""
    try:
        clear_report_log()
        return jsonify({
            'success': True,
            'message': '日志已清空'
        })
    except Exception as e:
        return jsonify({
            'success': False,
            'error': f'清空日志失败: {str(e)}'
        }), 500