"""
消息业务模型
定义消息的数据结构和业务逻辑
"""
from dataclasses import dataclass, field
from datetime import datetime
from typing import Optional, List
from config import ProtocolType, SerializationType
from models.field import Field


@dataclass
class Message:
    """
    消息模型类

    Attributes:
        id: 消息ID
        full_name: 完整名称（如 Radar.Receiver.v3）
        system_name: 系统名（如 Radar）
        message_type: 消息类型（如 Receiver）
        version: 版本号（如 v3）
        fields: 关联的字段列表
        description: 描述信息
        protocol: 传输协议
        serialization: 序列化格式
        created_time: 创建时间
        updated_time: 更新时间
    """

    full_name: str
    system_name: str
    message_type: str
    version: str
    protocol: ProtocolType
    serialization: SerializationType
    id: Optional[int] = None
    fields: List[Field] = field(default_factory=list)
    description: Optional[str] = None
    created_time: Optional[datetime] = None
    updated_time: Optional[datetime] = None

    def __post_init__(self):
        """初始化后处理"""
        # 确保protocol和serialization是枚举类型
        if isinstance(self.protocol, str):
            self.protocol = ProtocolType(self.protocol)

        if isinstance(self.serialization, str):
            self.serialization = SerializationType(self.serialization)

        # 从full_name解析system_name、message_type和version
        if self.full_name and not self.system_name:
            self._parse_full_name()

    def _parse_full_name(self):
        """从完整名称解析系统名、消息类型和版本"""
        parts = self.full_name.split('.')
        if len(parts) >= 3:
            self.system_name = parts[0]
            self.message_type = parts[1]
            self.version = parts[2]
        elif len(parts) == 2:
            self.system_name = parts[0]
            self.message_type = parts[1]
            self.version = "v1"

    @staticmethod
    def build_full_name(system_name: str, message_type: str, version: str) -> str:
        """
        构建完整消息名

        Args:
            system_name: 系统名
            message_type: 消息类型
            version: 版本号

        Returns:
            完整消息名
        """
        return f"{system_name}.{message_type}.{version}"

    def add_field(self, field_obj: Field):
        """添加字段"""
        if field_obj not in self.fields:
            self.fields.append(field_obj)

    def remove_field(self, field_obj: Field):
        """移除字段"""
        if field_obj in self.fields:
            self.fields.remove(field_obj)

    def get_field_by_name(self, full_name: str) -> Optional[Field]:
        """根据完整名称获取字段"""
        for f in self.fields:
            if f.full_name == full_name:
                return f
        return None

    def validate(self) -> tuple[bool, str]:
        """
        验证消息数据的有效性

        Returns:
            (是否有效, 错误信息)
        """
        if not self.full_name:
            return False, "消息完整名称不能为空"

        if not self.system_name:
            return False, "系统名不能为空"

        if not self.message_type:
            return False, "消息类型不能为空"

        if not self.version:
            return False, "版本号不能为空"

        if not self.fields or len(self.fields) == 0:
            return False, "消息至少需要包含一个字段"

        if not self.protocol:
            return False, "传输协议不能为空"

        if not self.serialization:
            return False, "序列化格式不能为空"

        return True, ""

    def to_dict(self) -> dict:
        """转换为字典"""
        return {
            'id': self.id,
            'full_name': self.full_name,
            'system_name': self.system_name,
            'message_type': self.message_type,
            'version': self.version,
            'description': self.description,
            'protocol': self.protocol.value if isinstance(self.protocol, ProtocolType) else self.protocol,
            'serialization': self.serialization.value if isinstance(self.serialization,
                                                                    SerializationType) else self.serialization,
            'fields': [f.to_dict() for f in self.fields],
            'created_time': self.created_time.isoformat() if self.created_time else None,
            'updated_time': self.updated_time.isoformat() if self.updated_time else None,
        }

    @classmethod
    def from_dict(cls, data: dict) -> 'Message':
        """从字典创建对象"""
        # 解析字段列表
        fields = []
        if 'fields' in data:
            fields = [Field.from_dict(f) if isinstance(f, dict) else f for f in data['fields']]

        # 解析时间
        created_time = None
        if data.get('created_time'):
            if isinstance(data['created_time'], str):
                created_time = datetime.fromisoformat(data['created_time'])
            else:
                created_time = data['created_time']

        updated_time = None
        if data.get('updated_time'):
            if isinstance(data['updated_time'], str):
                updated_time = datetime.fromisoformat(data['updated_time'])
            else:
                updated_time = data['updated_time']

        return cls(
            id=data.get('id'),
            full_name=data['full_name'],
            system_name=data['system_name'],
            message_type=data['message_type'],
            version=data['version'],
            protocol=data['protocol'],
            serialization=data['serialization'],
            fields=fields,
            description=data.get('description'),
            created_time=created_time,
            updated_time=updated_time,
        )

    def __str__(self) -> str:
        """字符串表示"""
        return f"Message(id={self.id}, full_name={self.full_name}, fields={len(self.fields)})"

    def __repr__(self) -> str:
        """详细字符串表示"""
        return self.__str__()