"""Bounded direct research inputs; unknown properties are rejected at the interface."""

from datetime import date, datetime
from typing import Annotated, Literal

from pydantic import Field, model_validator

from ..backtests.contracts import Candidate, SimulationSettings
from ..catalog.contracts import CatalogFilters, Scope
from ..schemas import Contract

Identifier = Annotated[str, Field(min_length=1, max_length=100)]
RunId = Annotated[str, Field(min_length=1, max_length=36)]
AlphaId = Annotated[str, Field(min_length=1, max_length=100, pattern=r"^[A-Za-z0-9_-]+$")]


class Empty(Contract):
    pass


class Authentication(Contract):
    action: Literal["connect", "verify"] = "connect"


class ConnectionReference(Contract):
    job_id: RunId | None = None


class Page(Contract):
    limit: int = Field(default=25, ge=1, le=100)
    offset: int = Field(default=0, ge=0)


class CompleteSettings(SimulationSettings):
    @model_validator(mode="before")
    @classmethod
    def complete(cls, value):
        if isinstance(value, dict) and set(cls.model_fields) - value.keys():
            raise ValueError("必须提供每项完整设置；先读取 get_research_capabilities")
        return value

    model_config = {"json_schema_extra": {"required": list(SimulationSettings.model_fields)}}


class DirectCandidate(Candidate):
    settings: CompleteSettings


class Provenance(Contract):
    reference: str | None = Field(default=None, max_length=200)
    batch_id: str | None = Field(default=None, max_length=200)
    hypothesis: str | None = Field(default=None, max_length=2000)
    parent_run_id: RunId | None = None


class Submit(Contract):
    name: str = Field(min_length=1, max_length=200)
    candidates: list[DirectCandidate] = Field(min_length=1, max_length=100)
    idempotency_key: Identifier
    duplicate_policy: Literal["reject", "rerun"] = "reject"
    source: Provenance = Field(default_factory=Provenance)

    @model_validator(mode="after")
    def unique_ids(self):
        if len({c.client_item_id for c in self.candidates}) != len(self.candidates):
            raise ValueError("client_item_id 必须唯一")
        return self


class Control(Contract):
    run_id: RunId
    action: Literal["pause", "resume", "stop", "recover"]
    expected_version: int = Field(ge=1)
    idempotency_key: Identifier


class CatalogSearch(Contract):
    filters: CatalogFilters
    dataset_id: str | None = Field(default=None, min_length=1, max_length=200)


class Scopes(Contract):
    kind: Literal["scopes"]


class SettingOptions(Page):
    kind: Literal["settings"]


class Operators(Page):
    kind: Literal["operators"]
    q: str = Field(default="", max_length=300)
    category: str | None = None


class Availability(Contract):
    kind: Literal["field_availability"]
    field_id: Identifier
    scope: Scope


class Metadata(Contract):
    query: Annotated[Scopes | SettingOptions | Operators | Availability, Field(discriminator="kind")]


class CatalogRefresh(Contract):
    kind: Literal["catalog"]
    scope: Scope
    dataset_id: str | None = Field(default=None, min_length=1, max_length=200)


class OperatorsRefresh(Contract):
    kind: Literal["operators"]


class SettingsRefresh(Contract):
    kind: Literal["settings"]


class PnlRefresh(Contract):
    kind: Literal["pnl"]
    alpha_ids: list[Identifier] = Field(min_length=1, max_length=100)


class Refresh(Contract):
    query: Annotated[
        CatalogRefresh | OperatorsRefresh | SettingsRefresh | Availability | PnlRefresh,
        Field(discriminator="kind"),
    ]


class JobReference(Page):
    job_id: RunId


class SelfCorrelationCheck(Contract):
    alpha_ids: list[AlphaId] = Field(min_length=1, max_length=100)


class SelfCorrelationReference(Contract):
    alpha_id: AlphaId


class History(Page):
    source: str | None = Field(default=None, max_length=100)
    reference: str | None = Field(default=None, max_length=200)
    status: str | None = Field(default=None, max_length=30)
    created_from: datetime | None = None
    created_to: datetime | None = None
    scope: Scope | None = None
    q: str = Field(default="", max_length=300)
    candidates: list[DirectCandidate] | None = Field(default=None, min_length=1, max_length=100)

    @model_validator(mode="after")
    def dates(self):
        for value in (self.created_from, self.created_to):
            if value and not value.tzinfo:
                raise ValueError("时间须包含时区")
        if self.created_from and self.created_to and self.created_from > self.created_to:
            raise ValueError("起始时间不能晚于结束时间")
        return self


class RunReference(Contract):
    run_id: RunId
    after: int | None = Field(default=None, ge=0)
    event_limit: int = Field(default=25, ge=1, le=100)


class Results(Page):
    run_id: RunId
    item_ids: list[RunId] | None = Field(default=None, min_length=1, max_length=100)


class Artifact(Page):
    item_id: RunId
    kind: Literal["snapshot", "pnl"]
    date_from: date | None = None
    date_to: date | None = None

    @model_validator(mode="after")
    def dates(self):
        if self.kind == "snapshot" and (self.date_from or self.date_to):
            raise ValueError("日期筛选仅用于 PnL")
        if self.date_from and self.date_to and self.date_from > self.date_to:
            raise ValueError("起始日期不能晚于结束日期")
        return self