"""
数据库模型定义
使用SQLAlchemy ORM（可选）
"""
from sqlalchemy import (
    Column, Integer, String, Float, DateTime, ForeignKey, Table, Text
)
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship
from datetime import datetime

Base = declarative_base()


class FieldModel(Base):
    """字段数据库模型"""
    __tablename__ = 'fields'

    id = Column(Integer, primary_key=True, autoincrement=True)
    full_name = Column(String(255), unique=True, nullable=False)
    domain = Column(String(100), nullable=False, index=True)
    sub_domains = Column(String(255))
    name = Column(String(100), nullable=False, index=True)
    type = Column(String(50), nullable=False, index=True)
    range_min = Column(String(100))
    range_max = Column(String(100))
    default_value = Column(String(255))
    unit = Column(String(50))
    description = Column(Text)
    created_time = Column(DateTime, default=datetime.now)
    updated_time = Column(DateTime, default=datetime.now, onupdate=datetime.now)

    # 关系
    messages = relationship('MessageFieldAssociation', back_populates='field')

    def __repr__(self):
        return f"<FieldModel(id={self.id}, full_name='{self.full_name}')>"


class MessageModel(Base):
    """消息数据库模型"""
    __tablename__ = 'messages'

    id = Column(Integer, primary_key=True, autoincrement=True)
    full_name = Column(String(255), unique=True, nullable=False)
    system_name = Column(String(100), nullable=False, index=True)
    message_type = Column(String(100), nullable=False, index=True)
    version = Column(String(50), nullable=False, index=True)
    description = Column(Text)
    protocol = Column(String(50), nullable=False)
    serialization = Column(String(50), nullable=False)
    created_time = Column(DateTime, default=datetime.now)
    updated_time = Column(DateTime, default=datetime.now, onupdate=datetime.now)

    # 关系
    fields = relationship('MessageFieldAssociation', back_populates='message')

    def __repr__(self):
        return f"<MessageModel(id={self.id}, full_name='{self.full_name}')>"


class MessageFieldAssociation(Base):
    """消息-字段关联表"""
    __tablename__ = 'message_fields'

    id = Column(Integer, primary_key=True, autoincrement=True)
    message_id = Column(Integer, ForeignKey('messages.id', ondelete='CASCADE'), nullable=False)
    field_id = Column(Integer, ForeignKey('fields.id', ondelete='CASCADE'), nullable=False)
    field_order = Column(Integer, nullable=False)

    # 关系
    message = relationship('MessageModel', back_populates='fields')
    field = relationship('FieldModel', back_populates='messages')

    def __repr__(self):
        return f"<MessageFieldAssociation(message_id={self.message_id}, field_id={self.field_id})>"


class MappingModel(Base):
    """映射模型数据库模型"""
    __tablename__ = 'mapping_models'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String(255), unique=True, nullable=False)
    mapping_type = Column(String(50), nullable=False, index=True)
    source_field_ids = Column(Text, nullable=False)  # JSON格式存储
    target_field_id = Column(Integer, ForeignKey('fields.id', ondelete='CASCADE'), nullable=False)
    operator = Column(String(50))
    operand = Column(String(255))
    language = Column(String(50))
    code = Column(Text)
    description = Column(Text)
    created_time = Column(DateTime, default=datetime.now)
    updated_time = Column(DateTime, default=datetime.now, onupdate=datetime.now)

    def __repr__(self):
        return f"<MappingModel(id={self.id}, name='{self.name}')>"


class GraphNodeModel(Base):
    """映射图节点模型"""
    __tablename__ = 'mapping_graph_nodes'

    id = Column(Integer, primary_key=True, autoincrement=True)
    field_id = Column(Integer, ForeignKey('fields.id', ondelete='CASCADE'), unique=True, nullable=False)
    x_position = Column(Float, default=0.0)
    y_position = Column(Float, default=0.0)

    def __repr__(self):
        return f"<GraphNodeModel(id={self.id}, field_id={self.field_id})>"


class GraphEdgeModel(Base):
    """映射图边模型"""
    __tablename__ = 'mapping_graph_edges'

    id = Column(Integer, primary_key=True, autoincrement=True)
    source_field_id = Column(Integer, ForeignKey('fields.id', ondelete='CASCADE'), nullable=False)
    target_field_id = Column(Integer, ForeignKey('fields.id', ondelete='CASCADE'), nullable=False)
    mapping_id = Column(Integer, ForeignKey('mapping_models.id', ondelete='CASCADE'), nullable=False)
    weight = Column(Float, default=1.0)

    def __repr__(self):
        return f"<GraphEdgeModel(id={self.id}, {self.source_field_id}->{self.target_field_id})>"


class CompositeMappingModel(Base):
    """复合映射模型"""
    __tablename__ = 'composite_mappings'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String(255), unique=True, nullable=False)
    description = Column(Text)
    created_time = Column(DateTime, default=datetime.now)
    updated_time = Column(DateTime, default=datetime.now, onupdate=datetime.now)

    # 关系
    items = relationship('CompositeMappingItemModel', back_populates='composite')

    def __repr__(self):
        return f"<CompositeMappingModel(id={self.id}, name='{self.name}')>"


class CompositeMappingItemModel(Base):
    """复合映射项模型"""
    __tablename__ = 'composite_mapping_items'

    id = Column(Integer, primary_key=True, autoincrement=True)
    composite_id = Column(Integer, ForeignKey('composite_mappings.id', ondelete='CASCADE'), nullable=False)
    mapping_id = Column(Integer, ForeignKey('mapping_models.id', ondelete='CASCADE'), nullable=False)
    item_order = Column(Integer, nullable=False)

    # 关系
    composite = relationship('CompositeMappingModel', back_populates='items')

    def __repr__(self):
        return f"<CompositeMappingItemModel(composite_id={self.composite_id}, mapping_id={self.mapping_id})>"