from __future__ import annotations
from datetime import datetime
from typing import ClassVar, Literal
from uuid import UUID

from pydantic import BaseModel, ConfigDict, Field

from schemas.todo import TodoOrder


class TodoCreate(BaseModel):
    model_config: ClassVar[ConfigDict] = ConfigDict(extra="forbid")

    title: str = Field(..., min_length=1, max_length=255)
    description: str | None = Field(None, max_length=1000)
    priority: int = Field(1, ge=1, le=4)
    order: TodoOrder | None = None
    schedule_item_ids: list[UUID] = Field(default_factory=list)


class TodoUpdate(BaseModel):
    model_config: ClassVar[ConfigDict] = ConfigDict(extra="forbid")

    title: str | None = Field(None, min_length=1, max_length=255)
    description: str | None = Field(None, max_length=1000)
    priority: int | None = Field(None, ge=1, le=4)
    order: TodoOrder | None = None
    status: Literal["pending", "done", "canceled"] | None = None
    schedule_item_ids: list[UUID] | None = None


class ScheduleItemBasic(BaseModel):
    model_config: ClassVar[ConfigDict] = ConfigDict(from_attributes=True)

    id: UUID
    title: str
    start_at: datetime
    end_at: datetime | None


class TodoResponse(BaseModel):
    model_config: ClassVar[ConfigDict] = ConfigDict(from_attributes=True)

    id: UUID
    owner_id: UUID
    title: str
    description: str | None
    priority: int
    order: TodoOrder
    status: str
    completed_at: datetime | None
    created_at: datetime
    updated_at: datetime
    schedule_items: list[ScheduleItemBasic] = Field(default_factory=list)


class TodoReorderItem(BaseModel):
    model_config: ClassVar[ConfigDict] = ConfigDict(extra="forbid")

    id: UUID
    priority: int = Field(..., ge=1, le=4)
    order: TodoOrder


class TodoReorderRequest(BaseModel):
    model_config: ClassVar[ConfigDict] = ConfigDict(extra="forbid")

    items: list[TodoReorderItem] = Field(..., min_length=1)


class TodoComplete(BaseModel):
    model_config: ClassVar[ConfigDict] = ConfigDict(extra="forbid")

    pass