from __future__ import annotations

from datetime import datetime
from typing import Any, Literal

from pydantic import BaseModel, ConfigDict, Field


class CaseStatusWriteRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    status_key: str = Field(min_length=1, max_length=120)
    label: str = Field(min_length=1, max_length=255)
    category: str = Field(default="open", max_length=30)
    terminal: bool = False
    sort_order: int = Field(default=100, ge=-10_000, le=10_000)
    active: bool = True
    expected_revision: int | None = Field(default=None, ge=1)


class CaseTypeWriteRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    type_key: str = Field(min_length=1, max_length=120)
    label: str = Field(min_length=1, max_length=255)
    description: str | None = Field(default=None, max_length=4_000)
    initial_status_key: str = Field(min_length=1, max_length=120)
    allowed_status_keys: list[str] = Field(default_factory=list, max_length=100)
    active: bool = True
    expected_revision: int | None = Field(default=None, ge=1)


class CaseWriteRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    record: dict[str, Any]
    idempotency_key: str = Field(min_length=1, max_length=255)


class CaseGrantRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    subject_kind: Literal[
        "account",
        "identity",
        "group",
        "role",
        "function",
        "function_assignment",
        "organization_unit",
        "service_account",
    ]
    subject_id: str = Field(min_length=1, max_length=255)
    permissions: list[Literal["read", "update", "share", "admin"]] = Field(
        default_factory=lambda: ["read"],
        min_length=1,
        max_length=4,
    )


class CaseUpdateRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    expected_revision: int = Field(ge=1)
    recorded_at: datetime
    change_reason: str = Field(min_length=1, max_length=1_000)
    idempotency_key: str = Field(min_length=1, max_length=255)
    status_key: str | None = Field(default=None, min_length=1, max_length=120)
    title: str | None = Field(default=None, min_length=1, max_length=500)
    access_mode: Literal["tenant", "restricted"] | None = None
    access_grants: list[CaseGrantRequest] | None = Field(
        default=None,
        max_length=500,
    )
    party_refs: list[dict[str, Any]] | None = Field(default=None, max_length=500)
    assignment_refs: list[dict[str, Any]] | None = Field(default=None, max_length=500)
    evidence_refs: list[dict[str, Any]] | None = Field(default=None, max_length=1_000)
    decision_refs: list[dict[str, Any]] | None = Field(default=None, max_length=500)
    record_refs: list[dict[str, Any]] | None = Field(default=None, max_length=500)
    deadline_at: datetime | None = None
    closed_at: datetime | None = None
    metadata: dict[str, Any] | None = None


class CaseOwnerReferenceRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    owner_module: str = Field(min_length=1, max_length=120)
    kind: str = Field(min_length=1, max_length=120)
    object_id: str = Field(min_length=1, max_length=1_000)
    tenant_id: str = Field(min_length=1, max_length=255)
    version: str = Field(min_length=1, max_length=255)
    path: str = Field(min_length=1, max_length=2_000)


class CaseEvidenceLinkRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    expected_revision: int = Field(ge=1)
    recorded_at: datetime
    change_reason: str = Field(min_length=1, max_length=1_000)
    idempotency_key: str = Field(min_length=1, max_length=255)
    reference: CaseOwnerReferenceRequest


class CaseEvidenceUnlinkRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    expected_revision: int = Field(ge=1)
    recorded_at: datetime
    change_reason: str = Field(min_length=1, max_length=1_000)
    idempotency_key: str = Field(min_length=1, max_length=255)


class CaseDecisionRequest(BaseModel):
    model_config = ConfigDict(extra="forbid")

    expected_case_revision: int = Field(ge=1)
    effective_at: datetime
    decision_type: str = Field(min_length=1, max_length=120)
    operative_result: str = Field(min_length=1, max_length=20_000)
    reasoning: str = Field(min_length=1, max_length=50_000)
    conditions: list[str] = Field(default_factory=list, max_length=100)
    change_reason: str = Field(min_length=1, max_length=1_000)
    idempotency_key: str = Field(min_length=1, max_length=255)


class CaseListResponse(BaseModel):
    cases: list[dict[str, Any]]
    total: int
    offset: int
    limit: int


class CaseHistoryResponse(BaseModel):
    revisions: list[dict[str, Any]]


class CaseTimelineResponse(BaseModel):
    entries: list[dict[str, Any]]


__all__ = [
    "CaseGrantRequest",
    "CaseDecisionRequest",
    "CaseEvidenceLinkRequest",
    "CaseEvidenceUnlinkRequest",
    "CaseHistoryResponse",
    "CaseListResponse",
    "CaseStatusWriteRequest",
    "CaseTimelineResponse",
    "CaseTypeWriteRequest",
    "CaseUpdateRequest",
    "CaseWriteRequest",
]