"""
数据库服务
实现项目映射、分支模式匹配等功能
"""

import asyncio
from typing import Optional, List, Dict, Any
from datetime import datetime
import structlog
import re
from sqlalchemy import create_engine, Column, Integer, String, DateTime, Text, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.sql import text

from app.config import get_settings

logger = structlog.get_logger()
Base = declarative_base()


# 数据库模型
class APIKey(Base):
    """API 密钥模型"""
    __tablename__ = "api_keys"
    
    id = Column(Integer, primary_key=True, autoincrement=True)
    key = Column(String(255), unique=True, nullable=False)
    description = Column(Text)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)


class ProjectMapping(Base):
    """项目映射模型"""
    __tablename__ = "project_mappings"
    
    id = Column(Integer, primary_key=True, autoincrement=True)
    repository_name = Column(String(255), unique=True, nullable=False)
    default_job = Column(String(255))
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # 关系
    branch_jobs = relationship("BranchJob", back_populates="project", cascade="all, delete-orphan")
    branch_patterns = relationship("BranchPattern", back_populates="project", cascade="all, delete-orphan")


class BranchJob(Base):
    """分支任务映射模型"""
    __tablename__ = "branch_jobs"
    
    id = Column(Integer, primary_key=True, autoincrement=True)
    project_id = Column(Integer, ForeignKey("project_mappings.id"), nullable=False)
    branch_name = Column(String(255), nullable=False)
    job_name = Column(String(255), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # 关系
    project = relationship("ProjectMapping", back_populates="branch_jobs")


class BranchPattern(Base):
    """分支模式映射模型"""
    __tablename__ = "branch_patterns"
    
    id = Column(Integer, primary_key=True, autoincrement=True)
    project_id = Column(Integer, ForeignKey("project_mappings.id"), nullable=False)
    pattern = Column(String(255), nullable=False)
    job_name = Column(String(255), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # 关系
    project = relationship("ProjectMapping", back_populates="branch_patterns")


class TriggerLog(Base):
    """触发日志模型"""
    __tablename__ = "trigger_logs"
    
    id = Column(Integer, primary_key=True, autoincrement=True)
    repository_name = Column(String(255), nullable=False)
    branch_name = Column(String(255), nullable=False)
    commit_sha = Column(String(255), nullable=False)
    job_name = Column(String(255), nullable=False)
    status = Column(String(50), nullable=False)
    error_message = Column(Text)
    created_at = Column(DateTime, default=datetime.utcnow)


class DatabaseService:
    """数据库服务"""
    
    def __init__(self):
        self.settings = get_settings()
        self.engine = None
        self.SessionLocal = None
        self._init_database()
    
    def _init_database(self):
        """初始化数据库"""
        try:
            self.engine = create_engine(
                self.settings.database.url,
                echo=self.settings.database.echo,
                pool_size=self.settings.database.pool_size,
                max_overflow=self.settings.database.max_overflow
            )
            
            # 创建表
            Base.metadata.create_all(bind=self.engine)
            
            # 创建会话工厂
            self.SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=self.engine)
            
            logger.info("Database initialized successfully")
            
        except Exception as e:
            logger.error("Failed to initialize database", error=str(e))
            raise
    
    def get_session(self):
        """获取数据库会话"""
        return self.SessionLocal()
    
    async def get_project_mapping(self, repository_name: str) -> Optional[Dict[str, Any]]:
        """
        获取项目映射
        
        Args:
            repository_name: 仓库名
            
        Returns:
            Dict: 项目映射信息
        """
        try:
            def _get_mapping():
                session = self.get_session()
                try:
                    project = session.query(ProjectMapping).filter(
                        ProjectMapping.repository_name == repository_name
                    ).first()
                    
                    if not project:
                        return None
                    
                    # 构建返回数据
                    result = {
                        "id": project.id,
                        "repository_name": project.repository_name,
                        "default_job": project.default_job,
                        "branch_jobs": [],
                        "branch_patterns": []
                    }
                    
                    # 添加分支任务映射
                    for branch_job in project.branch_jobs:
                        result["branch_jobs"].append({
                            "id": branch_job.id,
                            "branch_name": branch_job.branch_name,
                            "job_name": branch_job.job_name
                        })
                    
                    # 添加分支模式映射
                    for pattern in project.branch_patterns:
                        result["branch_patterns"].append({
                            "id": pattern.id,
                            "pattern": pattern.pattern,
                            "job_name": pattern.job_name
                        })
                    
                    return result
                    
                finally:
                    session.close()
            
            # 在线程池中执行数据库操作
            loop = asyncio.get_event_loop()
            return await loop.run_in_executor(None, _get_mapping)
            
        except Exception as e:
            logger.error("Failed to get project mapping", 
                        repository_name=repository_name, error=str(e))
            return None
    
    async def determine_job_name(self, repository_name: str, branch_name: str) -> Optional[str]:
        """
        根据分支名确定任务名
        
        Args:
            repository_name: 仓库名
            branch_name: 分支名
            
        Returns:
            str: 任务名
        """
        try:
            project = await self.get_project_mapping(repository_name)
            if not project:
                return None
            
            # 1. 检查精确分支匹配
            for branch_job in project["branch_jobs"]:
                if branch_job["branch_name"] == branch_name:
                    logger.debug("Found exact branch match", 
                               branch=branch_name, job=branch_job["job_name"])
                    return branch_job["job_name"]
            
            # 2. 检查模式匹配
            for pattern in project["branch_patterns"]:
                try:
                    if re.match(pattern["pattern"], branch_name):
                        logger.debug("Branch matched pattern", 
                                   branch=branch_name, pattern=pattern["pattern"], 
                                   job=pattern["job_name"])
                        return pattern["job_name"]
                except re.error as e:
                    logger.error("Invalid regex pattern", 
                               pattern=pattern["pattern"], error=str(e))
                    continue
            
            # 3. 使用默认任务
            if project["default_job"]:
                logger.debug("Using default job", 
                           branch=branch_name, job=project["default_job"])
                return project["default_job"]
            
            return None
            
        except Exception as e:
            logger.error("Failed to determine job name", 
                        repository_name=repository_name, branch_name=branch_name, 
                        error=str(e))
            return None
    
    async def log_trigger(self, log_data: Dict[str, Any]) -> bool:
        """
        记录触发日志
        
        Args:
            log_data: 日志数据
            
        Returns:
            bool: 是否成功
        """
        try:
            def _log_trigger():
                session = self.get_session()
                try:
                    log = TriggerLog(
                        repository_name=log_data["repository_name"],
                        branch_name=log_data["branch_name"],
                        commit_sha=log_data["commit_sha"],
                        job_name=log_data["job_name"],
                        status=log_data["status"],
                        error_message=log_data.get("error_message")
                    )
                    
                    session.add(log)
                    session.commit()
                    return True
                    
                except Exception as e:
                    session.rollback()
                    logger.error("Failed to log trigger", error=str(e))
                    return False
                finally:
                    session.close()
            
            loop = asyncio.get_event_loop()
            return await loop.run_in_executor(None, _log_trigger)
            
        except Exception as e:
            logger.error("Failed to log trigger", error=str(e))
            return False
    
    async def get_trigger_logs(self, repository_name: str = None, 
                             branch_name: str = None, limit: int = 100) -> List[Dict[str, Any]]:
        """
        获取触发日志
        
        Args:
            repository_name: 仓库名（可选）
            branch_name: 分支名（可选）
            limit: 限制数量
            
        Returns:
            List: 日志列表
        """
        try:
            def _get_logs():
                session = self.get_session()
                try:
                    query = session.query(TriggerLog)
                    
                    if repository_name:
                        query = query.filter(TriggerLog.repository_name == repository_name)
                    
                    if branch_name:
                        query = query.filter(TriggerLog.branch_name == branch_name)
                    
                    logs = query.order_by(TriggerLog.created_at.desc()).limit(limit).all()
                    
                    return [
                        {
                            "id": log.id,
                            "repository_name": log.repository_name,
                            "branch_name": log.branch_name,
                            "commit_sha": log.commit_sha,
                            "job_name": log.job_name,
                            "status": log.status,
                            "error_message": log.error_message,
                            "created_at": log.created_at.isoformat()
                        }
                        for log in logs
                    ]
                    
                finally:
                    session.close()
            
            loop = asyncio.get_event_loop()
            return await loop.run_in_executor(None, _get_logs)
            
        except Exception as e:
            logger.error("Failed to get trigger logs", error=str(e))
            return []
    
    async def create_project_mapping(self, mapping_data: Dict[str, Any]) -> bool:
        """
        创建项目映射
        
        Args:
            mapping_data: 映射数据
            
        Returns:
            bool: 是否成功
        """
        try:
            def _create_mapping():
                session = self.get_session()
                try:
                    # 创建项目映射
                    project = ProjectMapping(
                        repository_name=mapping_data["repository_name"],
                        default_job=mapping_data.get("default_job")
                    )
                    
                    session.add(project)
                    session.flush()  # 获取 ID
                    
                    # 添加分支任务映射
                    for branch_job in mapping_data.get("branch_jobs", []):
                        job = BranchJob(
                            project_id=project.id,
                            branch_name=branch_job["branch_name"],
                            job_name=branch_job["job_name"]
                        )
                        session.add(job)
                    
                    # 添加分支模式映射
                    for pattern in mapping_data.get("branch_patterns", []):
                        pattern_obj = BranchPattern(
                            project_id=project.id,
                            pattern=pattern["pattern"],
                            job_name=pattern["job_name"]
                        )
                        session.add(pattern_obj)
                    
                    session.commit()
                    return True
                    
                except Exception as e:
                    session.rollback()
                    logger.error("Failed to create project mapping", error=str(e))
                    return False
                finally:
                    session.close()
            
            loop = asyncio.get_event_loop()
            return await loop.run_in_executor(None, _create_mapping)
            
        except Exception as e:
            logger.error("Failed to create project mapping", error=str(e))
            return False


# 全局数据库服务实例
_database_service: Optional[DatabaseService] = None


def get_database_service() -> DatabaseService:
    """获取数据库服务实例"""
    global _database_service
    if _database_service is None:
        _database_service = DatabaseService()
    return _database_service