"""前端组件目录及查询结果"""

from typing import Self

from pydantic import BaseModel, ConfigDict, Field, model_validator

from app.schemas.base import ExtensibleModel, JsonObject, NonBlankString
from app.schemas.material_field import MISSING, FieldGroup, lookup
from app.schemas.screen import Layout, PositiveNumber


class ComponentSummary(BaseModel):
    key: NonBlankString  # 目录编号
    type: NonBlankString  # 前端实际组件类型
    name: NonBlankString  # 组件名称
    description: NonBlankString  # 组件用途
    default_width: PositiveNumber  # 默认宽度，单位 px
    default_height: PositiveNumber  # 默认高度，单位 px


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


class EventOption(ExtensibleModel):
    label: NonBlankString
    value: NonBlankString = Field(description="事件类型，即节点 events[].type")


class EventGroup(ExtensibleModel):
    """多个物料共用的一组事件，物料按 key 引用；前端接口展开成 eventOptions 数组"""

    key: NonBlankString
    options: list[EventOption]


class ComponentDefinition(ExtensibleModel):
    model_config = ConfigDict(serialize_by_alias=True)
    key: NonBlankString = Field(description="目录中的唯一编号，不是 Screen 节点 ID")
    type: NonBlankString = Field(
        description="前端实际注册的节点 type，不根据图表名称猜测"
    )
    name: NonBlankString = Field(description="组件名称")
    description: NonBlankString = Field(description="组件用途和支持的展示方式")
    tags: list[NonBlankString] = Field(
        default_factory=list, description="用于检索的分类和关键词"
    )
    renderer: NonBlankString = Field(description="渲染能力标识，当前从前端实现映射而来")
    group: NonBlankString
    icon: NonBlankString | None = None
    schema_: MaterialTemplate = Field(
        alias="schema", description="完整默认物料配置，不包含实例 ID"
    )
    field_groups: list[NonBlankString | FieldGroup] = Field(
        default_factory=list,
        description="字段分组：字符串引用目录的共享分组，对象为本物料独有的分组；"
        "前端属性面板的 setters 由它派生，不单独保存",
    )
    event_groups: list[NonBlankString] = Field(
        default_factory=list,
        description="引用目录的共享事件组，按顺序展开成前端的 eventOptions",
    )
    rows_path: NonBlankString | None = Field(
        default=None,
        description="组件数据行（对象数组）的点路径，例如 props.option.dataset.source；"
        "节点的 filters 作用在这里，后端检查按它取列；前端各物料自己知道数据行在哪",
    )
    data_source: bool = Field(
        default=False,
        description="组件可以绑定数据源（节点 dataId）：绑定后运行时的数据行换成数据源的数据，不再读 rows_path；"
        "前端按它决定是否显示数据源绑定。需要 rows_path",
    )
    usage_notes: list[NonBlankString] = Field(
        default_factory=list, description="配置、数据绑定及使用限制说明"
    )

    def template(self) -> JsonObject:
        """默认配置的 JSON；style 为 null 表示未设置，字段默认值按路径不存在处理"""
        data = self.schema_.model_dump(mode="json")
        if data.get("style") is None:
            data.pop("style", None)
        return data

    @model_validator(mode="after")
    def consistent_type(self) -> Self:
        if self.type != self.schema_.type:
            raise ValueError("目录 type 必须与 schema.type 一致")
        if "id" in self.schema_.model_extra:
            raise ValueError("默认物料配置不能包含实例 ID")
        if self.rows_path is not None:
            try:
                rows = lookup(self.template(), self.rows_segments)
            except ValueError:
                rows = MISSING
            if not isinstance(rows, list):
                raise ValueError(f"rows_path {self.rows_path} 在默认配置里不是数组")
        if self.data_source and self.rows_path is None:
            raise ValueError("data_source 的物料要声明 rows_path：绑定的数据源替换的是这里的数据行")
        return self

    @property
    def rows_segments(self) -> list[str | int]:
        return [
            int(part) if part.isdigit() else part for part in self.rows_path.split(".")
        ]


def _default_problem(field, template: JsonObject) -> str | None:
    """默认值只有一个来源：默认配置有该路径时取它，没有时字段必须声明 default；
    跟随主题的颜色由前端按画布主题取，默认配置里不能写死"""
    try:
        current = lookup(template, field.segments)
    except ValueError:
        return "的路径与默认配置结构冲突"
    if field.themed:
        return None if current is MISSING else "跟随主题，默认配置里不能写死颜色"
    if field.example and current is MISSING:
        return "标为示例内容，默认配置里要有这个值"
    if current is MISSING:
        if field.default is None:
            return "在默认配置中不存在，需要声明 default"
        error = field.value_error(field.default)
        return f"的 default {error}" if error else None
    if field.default is not None:
        return "在默认配置中已有值，不能再声明 default"
    error = field.value_error(current)
    return f"的默认配置值 {error}" if error else None


class ComponentCatalog(ExtensibleModel):
    version: NonBlankString = Field(
        description="前端组件目录版本，后续用于检查是否与前端匹配"
    )
    components: list[ComponentDefinition]
    field_groups: list[FieldGroup] = Field(
        default_factory=list, description="多个物料共用的字段分组，物料按 key 引用"
    )
    event_groups: list[EventGroup] = Field(
        default_factory=list, description="多个物料共用的事件组，物料按 key 引用"
    )

    def event_options(self, component: ComponentDefinition) -> list[JsonObject]:
        """物料引用的事件组按顺序展开，即前端的 eventOptions"""
        groups = {group.key: group for group in self.event_groups}
        return [
            option.model_dump(mode="json")
            for key in component.event_groups
            for option in groups[key].options
        ]

    @model_validator(mode="after")
    def unique_keys(self) -> Self:
        keys = [component.key for component in self.components]
        if len(keys) != len(set(keys)):
            raise ValueError("组件目录 key 不能重复")
        shared = [group.key for group in self.field_groups]
        if len(shared) != len(set(shared)):
            raise ValueError("共享字段分组 key 不能重复")
        event_groups = [group.key for group in self.event_groups]
        if len(event_groups) != len(set(event_groups)):
            raise ValueError("共享事件组 key 不能重复")
        for component in self.components:
            groups = [
                group.key if isinstance(group, FieldGroup) else group
                for group in component.field_groups
            ]
            if len(groups) != len(set(groups)):
                raise ValueError(f"物料 {component.key} 的字段分组 key 重复")
            if missing := [
                group
                for group in component.field_groups
                if isinstance(group, str) and group not in shared
            ]:
                raise ValueError(
                    f"物料 {component.key} 引用了不存在的共享分组: {missing}"
                )
            if shadowed := [
                group.key
                for group in component.field_groups
                if isinstance(group, FieldGroup) and group.key in shared
            ]:
                raise ValueError(
                    f"物料 {component.key} 的独有分组与共享分组重名: {shadowed}"
                )
            if missing := [
                key for key in component.event_groups if key not in event_groups
            ]:
                raise ValueError(f"物料 {component.key} 引用了不存在的事件组: {missing}")
            events = [option["value"] for option in self.event_options(component)]
            if len(events) != len(set(events)):
                raise ValueError(f"物料 {component.key} 的事件类型重复")
            by_key = {group.key: group for group in self.field_groups}
            fields = [
                field
                for group in component.field_groups
                for field in (by_key[group] if isinstance(group, str) else group).fields
            ]
            paths = [field.path for field in fields]
            if duplicated := sorted({path for path in paths if paths.count(path) > 1}):
                raise ValueError(f"物料 {component.key} 的字段路径重复: {duplicated}")
            template = component.template()
            for field in fields:
                problem = _default_problem(field, template)
                if problem:
                    raise ValueError(f"物料 {component.key} 字段 {field.path} {problem}")
        return self