"""
Mock任务模块 - 用于没有Redis时的开发测试

当Redis不可用时，可以使用这个模块来模拟Celery任务
"""
import time
import threading
from typing import Dict, Any, List
import uuid


class MockAsyncResult:
    """模拟Celery AsyncResult"""
    
    def __init__(self, task_id: str):
        self.id = task_id
        self.state = 'PENDING'
        self.info = {}
    
    def ready(self) -> bool:
        return self.state in ['SUCCESS', 'FAILURE']
    
    def successful(self) -> bool:
        return self.state == 'SUCCESS'
    
    def failed(self) -> bool:
        return self.state == 'FAILURE'


class MockCeleryTask:
    """模拟Celery任务"""
    
    def __init__(self, func):
        self.func = func
        self._results = {}
    
    def delay(self, *args, **kwargs):
        """模拟异步执行"""
        task_id = str(uuid.uuid4())
        
        # 创建结果对象
        result = MockAsyncResult(task_id)
        self._results[task_id] = result
        
        # 在后台线程中执行任务
        def run_task():
            try:
                result.state = 'PROGRESS'
                result.info = {'progress': 0}
                
                # 执行实际任务
                task_result = self.func(*args, **kwargs)
                
                result.state = 'SUCCESS'
                result.info = task_result
                
            except Exception as e:
                result.state = 'FAILURE'
                result.info = {'error': str(e)}
        
        thread = threading.Thread(target=run_task)
        thread.daemon = True
        thread.start()
        
        return result
    
    def apply_async(self, args=None, kwargs=None):
        """模拟apply_async"""
        args = args or []
        kwargs = kwargs or {}
        return self.delay(*args, **kwargs)


def mock_scan_aws_resources(task_id: int, credential_ids: List[int], 
                           regions: List[str], project_metadata: Dict[str, Any]) -> Dict[str, Any]:
    """
    模拟AWS资源扫描任务
    
    这个函数会模拟扫描过程，但不会实际调用AWS API
    """
    from app import db
    from app.models import Task, TaskLog, Report
    import os
    
    print(f"🔄 Mock: 开始扫描任务 {task_id}")
    
    # 更新任务状态
    task = db.session.get(Task, task_id)
    if not task:
        return {'status': 'error', 'message': 'Task not found'}
    
    try:
        task.status = 'running'
        task.progress = 0
        db.session.commit()
        
        # 添加开始日志
        log = TaskLog(
            task_id=task_id,
            level='info',
            message='Mock scan started',
            details='{"mode": "mock", "credentials": ' + str(len(credential_ids)) + ', "regions": ' + str(len(regions)) + '}'
        )
        db.session.add(log)
        db.session.commit()
        
        # 模拟扫描过程
        steps = [
            (20, "初始化扫描环境"),
            (40, "扫描VPC资源"),
            (60, "扫描EC2实例"),
            (80, "扫描RDS数据库"),
            (100, "生成报告")
        ]
        
        for progress, message in steps:
            time.sleep(2)  # 模拟扫描时间
            task.progress = progress
            
            # 添加进度日志
            log = TaskLog(
                task_id=task_id,
                level='info',
                message=f'Mock: {message}',
                details=f'{{"progress": {progress}}}'
            )
            db.session.add(log)
            db.session.commit()
            
            print(f"🔄 Mock: {message} ({progress}%)")
        
        # 模拟生成报告
        reports_folder = 'reports'
        os.makedirs(reports_folder, exist_ok=True)
        
        report_filename = f"mock-report-{task_id}-{int(time.time())}.docx"
        report_path = os.path.join(reports_folder, report_filename)
        
        # 创建一个简单的文本文件作为模拟报告
        with open(report_path, 'w', encoding='utf-8') as f:
            f.write(f"""Mock AWS Resource Scan Report
            
Task ID: {task_id}
Project: {project_metadata.get('projectName', 'Unknown')}
Client: {project_metadata.get('clientName', 'Unknown')}
Regions: {', '.join(regions)}
Credentials: {len(credential_ids)} accounts

This is a mock report generated for testing purposes.
No actual AWS resources were scanned.

Generated at: {time.strftime('%Y-%m-%d %H:%M:%S')}
""")
        
        # 创建报告记录
        report = Report(
            task_id=task_id,
            file_name=report_filename,
            file_path=report_path,
            file_size=os.path.getsize(report_path)
        )
        db.session.add(report)
        
        # 完成任务
        task.status = 'completed'
        task.progress = 100
        
        # 添加完成日志
        log = TaskLog(
            task_id=task_id,
            level='info',
            message='Mock scan completed successfully',
            details=f'{{"report_path": "{report_path}", "file_size": {report.file_size}}}'
        )
        db.session.add(log)
        db.session.commit()
        
        print(f"✅ Mock: 任务 {task_id} 完成")
        
        return {
            'status': 'success',
            'message': 'Mock scan completed',
            'resources_found': 42,  # 模拟找到的资源数量
            'report_path': report_path
        }
        
    except Exception as e:
        # 处理错误
        task.status = 'failed'
        
        # 添加错误日志
        log = TaskLog(
            task_id=task_id,
            level='error',
            message=f'Mock scan failed: {str(e)}',
            details=f'{{"error_type": "{type(e).__name__}", "error_message": "{str(e)}"}}'
        )
        db.session.add(log)
        db.session.commit()
        
        print(f"❌ Mock: 任务 {task_id} 失败: {e}")
        
        return {
            'status': 'error',
            'message': f'Mock scan failed: {str(e)}'
        }


# 创建模拟任务
scan_aws_resources = MockCeleryTask(mock_scan_aws_resources)