"""海报模板模型（AI 生图方案）。"""
from sqlalchemy import Column, String, Text, SmallInteger, BigInteger, TIMESTAMP, func
from insurance.db.compat import db


class PosterTemplate(db.Model):
    """海报模板表（AI 生图方案）。"""
    __tablename__ = "poster_templates"

    id = Column(BigInteger, primary_key=True, autoincrement=True)
    name = Column(String(100), nullable=False, comment="模板名称")
    scenario_tag = Column(String(50), nullable=True, comment="场景标签")
    style_description = Column(Text, nullable=False, comment="AI 生图风格描述 prompt 片段")
    color_scheme = Column(Text, nullable=True, comment="配色方案 JSON")
    reference_image = Column(String(500), nullable=True, comment="参考图地址")
    preview_image = Column(String(500), nullable=True, comment="预览图地址")
    status = Column(SmallInteger, default=1, comment="1=启用, 0=停用")
    created_at = Column(TIMESTAMP, server_default=func.now())
    updated_at = Column(TIMESTAMP, server_default=func.now(), onupdate=func.now())

    def to_dict(self):
        import json
        color_scheme = None
        if self.color_scheme:
            try:
                color_scheme = json.loads(self.color_scheme)
            except (json.JSONDecodeError, TypeError):
                color_scheme = None
        return {
            "id": self.id,
            "name": self.name,
            "scenarioTag": self.scenario_tag,
            "styleDescription": self.style_description,
            "colorScheme": color_scheme,
            "referenceImage": self.reference_image,
            "previewImage": self.preview_image,
            "status": self.status,
            "createdAt": self.created_at.isoformat() if self.created_at else None,
            "updatedAt": self.updated_at.isoformat() if self.updated_at else None,
        }