import uuid
from datetime import datetime
from typing import Literal

from pydantic import BaseModel, Field, field_validator

LedgerRole = Literal["VIEWER", "EDITOR", "MANAGER"]


class LedgerRead(BaseModel):
    id: uuid.UUID
    title: str
    description: str
    status: Literal["ACTIVE", "ARCHIVED"]
    owner_id: uuid.UUID
    owner_name: str
    generation: int
    updated_at: datetime
    current_revision_id: uuid.UUID | None
    current_revision_no: int | None
    current_revision_file_size: int | None
    current_revision_mime_type: str | None
    current_revision_created_at: datetime | None
    role: LedgerRole
    can_edit: bool
    can_manage: bool
    can_export: bool
    allow_export: bool
    allow_edit_request: bool
    allow_sheet_structure_edit: bool
    file_type: Literal["cell"] = "cell"
    extension: Literal["xlsx"] = "xlsx"
    can_request_edit: bool
    edit_request_status: Literal["PENDING", "APPROVED", "REJECTED"] | None = None
    can_transfer_ownership: bool


class LedgerSettings(BaseModel):
    title: str = Field(min_length=1, max_length=240)
    description: str = Field(default="", max_length=500)
    status: Literal["ACTIVE", "ARCHIVED"]
    owner_id: uuid.UUID
    allow_export: bool = False
    allow_edit_request: bool | None = None
    allow_sheet_structure_edit: bool = False
    generation: int = Field(ge=1)

    @field_validator("title")
    @classmethod
    def trim_title(cls, value):
        value = value.strip()
        if not value:
            raise ValueError("台账名称不能为空")
        return value


class LedgerMemberUpsert(BaseModel):
    user_id: uuid.UUID
    role: LedgerRole


class LedgerMemberRead(BaseModel):
    user_id: uuid.UUID
    full_name: str
    email: str
    role: LedgerRole
    is_active: bool
    protected_label: str | None = None


class LedgerCandidateRead(BaseModel):
    user_id: uuid.UUID
    full_name: str
    email: str
    role_in_study: str
    can_be_editor: bool = True
    can_be_manager: bool = True


class LedgerAccessSettings(BaseModel):
    generation: int = Field(ge=1)
    allow_export: bool | None = None
    allow_edit_request: bool | None = None
    allow_sheet_structure_edit: bool | None = None


class LedgerRestore(BaseModel):
    generation: int = Field(ge=1)