"""大屏公共结构；组件属性、事件与数据源配置保持开放"""

from typing import Annotated, Self

from pydantic import Field, model_validator

from .base import ExtensibleModel, JsonObject, NonBlankString

Number = int | float
PositiveNumber = Annotated[Number, Field(gt=0)]


class Canvas(ExtensibleModel):
    width: PositiveNumber
    height: PositiveNumber


class Layout(ExtensibleModel):
    x: Number
    y: Number
    width: PositiveNumber
    height: PositiveNumber


class ScreenNode(ExtensibleModel):
    id: NonBlankString
    type: NonBlankString
    layout: Layout
    name: str | None = None
    props: JsonObject = Field(default_factory=dict)
    style: JsonObject | None = None
    events: list[JsonObject] | None = None


class Screen(ExtensibleModel):
    canvas: Canvas
    nodes: list[ScreenNode]
    # 保持前端字段名；数据源的具体类型与绑定校验后续再引入
    dataSource: list[JsonObject] = Field(default_factory=list)

    @model_validator(mode="after")
    def unique_node_ids(self) -> Self:
        seen: set[str] = set()
        for node in self.nodes:
            if node.id in seen:
                raise ValueError(f"重复的节点 ID: {node.id}")
            seen.add(node.id)
        return self