"""Public AI contracts. Client input never contains provider history or tool results."""

from typing import Literal
from urllib.parse import urlsplit

from pydantic import Field, SecretStr, field_validator

from ..schemas import AlphaFilters, Contract


class ModelSettingsInput(Contract):
    base_url: str = Field(max_length=2000)
    api_key: SecretStr | None = None
    model: str = Field(min_length=1, max_length=200)
    protocol: Literal["chat_completions", "responses"] = "chat_completions"
    enabled: bool = False

    @field_validator("base_url")
    @classmethod
    def valid_url(cls, value):
        value = value.strip().rstrip("/")
        url = urlsplit(value)
        if (
            url.scheme not in ("http", "https")
            or not url.hostname
            or url.username
            or url.password
            or url.query
            or url.fragment
        ):
            raise ValueError("请输入不含账户、查询参数或片段的 HTTP/HTTPS API 根地址")
        if url.path.endswith(("/chat/completions", "/responses")):
            raise ValueError("请填写 API 根地址，例如 https://example.com/v1")
        return value


class PageContext(Contract):
    page: Literal["alphas", "account", "datasets"] = "alphas"
    alpha_id: str | None = Field(default=None, max_length=100, pattern=r"^[A-Za-z0-9_-]+$")
    selected_ids: list[str] = Field(default_factory=list, max_length=100)
    filters: AlphaFilters = Field(default_factory=AlphaFilters)

    @field_validator("selected_ids")
    @classmethod
    def check_ids(cls, value):
        from ..schemas import valid_ids

        return valid_ids(value) if value else []


class RunInput(Contract):
    request_id: str = Field(min_length=1, max_length=100, pattern=r"^[A-Za-z0-9_-]+$")
    message: str = Field(min_length=1, max_length=20000)
    context: PageContext = Field(default_factory=PageContext)


class Decision(Contract):
    approved: bool