from sqlalchemy import Boolean, CheckConstraint, Integer, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.models.base import Base, TimestampMixin, SoftDeleteMixin


class ImageEngine(Base, TimestampMixin, SoftDeleteMixin):
    __tablename__ = "image_engines"
    __table_args__ = (
        CheckConstraint("max_generation_count BETWEEN 1 AND 5", name="ck_image_engines_max_generation_count"),
        CheckConstraint("multi_image_max_images BETWEEN 1 AND 15", name="ck_image_engines_multi_image_max_images"),
        CheckConstraint("max_reference_image_count BETWEEN 0 AND 14", name="ck_image_engines_max_reference_image_count"),
    )

    id: Mapped[str] = mapped_column(String(32), primary_key=True)
    name: Mapped[str] = mapped_column(String(64), nullable=False)
    provider: Mapped[str] = mapped_column(String(32), nullable=False)
    api_base: Mapped[str] = mapped_column(String(512), nullable=False)
    api_key: Mapped[str] = mapped_column(String(256), default="")
    model_name: Mapped[str] = mapped_column(String(128), default="")
    supported_models: Mapped[str] = mapped_column(Text, default='["doubao-seedream-5-0-260128"]')
    # {"2K":{"1:1":"2048×2048",...}, "4K":{"1:1":"4096×4096",...}}
    supported_sizes: Mapped[str] = mapped_column(Text, default='{}')
    default_size: Mapped[str] = mapped_column(String(32), default="2K")
    max_image_count: Mapped[int] = mapped_column(Integer, default=0)

    # 管理后台只配置能力开关与数量上限；本次实际生成数量保存在 ChatGenerationTask.generation_count。
    multi_generation_enabled: Mapped[bool] = mapped_column(
        Boolean,
        default=False,
        server_default="false",
        nullable=False,
    )
    max_generation_count: Mapped[int] = mapped_column(
        Integer,
        default=1,
        server_default="1",
        nullable=False,
    )

    # 火山组图接口能力约束。多份图片始终只调用一次 sequential_image_generation=auto 接口。
    multi_image_max_images: Mapped[int] = mapped_column(Integer, default=15, server_default="15", nullable=False)
    max_reference_image_count: Mapped[int] = mapped_column(Integer, default=14, server_default="14", nullable=False)
    # 留空表示不向供应商传 output_format；用于兼容不支持该参数的模型。
    output_format: Mapped[str] = mapped_column(String(16), default="", server_default="", nullable=False)
    generate_url: Mapped[str | None] = mapped_column(String(512), nullable=True, default="")
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    priority: Mapped[int] = mapped_column(Integer, default=0)