from pydantic import BaseModel, ConfigDict, Field
from datetime import datetime, date, time
from typing import Optional, Literal

TodoPriority = Literal["none", "low", "medium", "high"]
RecurrenceRule = Literal["daily", "weekly", "monthly"]


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

    title: str = Field(min_length=1, max_length=255)
    description: Optional[str] = Field(None, max_length=5000)
    priority: TodoPriority = "medium"
    due_date: Optional[date] = None
    due_time: Optional[time] = None
    category: Optional[str] = Field(None, max_length=100)
    recurrence_rule: Optional[RecurrenceRule] = None
    project_id: Optional[int] = None


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

    title: Optional[str] = Field(None, min_length=1, max_length=255)
    description: Optional[str] = Field(None, max_length=5000)
    priority: Optional[TodoPriority] = None
    due_date: Optional[date] = None
    due_time: Optional[time] = None
    completed: Optional[bool] = None
    category: Optional[str] = Field(None, max_length=100)
    recurrence_rule: Optional[RecurrenceRule] = None
    project_id: Optional[int] = None


class TodoResponse(BaseModel):
    id: int
    title: str
    description: Optional[str]
    priority: str
    due_date: Optional[date]
    due_time: Optional[time]
    completed: bool
    completed_at: Optional[datetime]
    category: Optional[str]
    recurrence_rule: Optional[str]
    reset_at: Optional[datetime]
    next_due_date: Optional[date]
    project_id: Optional[int]
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)