from pydantic import BaseModel, Field
from typing import Optional, List
from datetime import datetime
from enum import Enum

class PriorityLevel(str, Enum):
    LOW = "low"
    MEDIUM = "medium"
    HIGH = "high"

class BoardStatus(str, Enum):
    TODO = "todo"
    IN_PROGRESS = "in_progress"
    REVIEW = "review"
    DONE = "done"

class TagBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=50)

class TagCreate(TagBase):
    pass

class TagResponse(TagBase):
    id: int
    created_at: datetime

    class Config:
        from_attributes = True

class SubtaskBase(BaseModel):
    title: str = Field(..., min_length=1, max_length=100)
    completed: bool = False

class SubtaskCreate(SubtaskBase):
    pass

class SubtaskUpdate(BaseModel):
    title: Optional[str] = Field(None, min_length=1, max_length=100)
    completed: Optional[bool] = None

class SubtaskResponse(SubtaskBase):
    id: int
    todo_id: int
    created_at: datetime
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True

class TodoBase(BaseModel):
    title: str = Field(..., min_length=1, max_length=100)
    description: Optional[str] = None
    completed: bool = False
    priority: PriorityLevel = PriorityLevel.MEDIUM
    status: BoardStatus = BoardStatus.TODO
    due_date: Optional[datetime] = None
    remind_at: Optional[datetime] = None
    board_id: Optional[int] = None

class TodoCreate(TodoBase):
    tag_ids: Optional[List[int]] = []

class TodoCreateWithTags(TodoBase):
    tags: Optional[List[str]] = []

class TodoUpdate(BaseModel):
    title: Optional[str] = Field(None, min_length=1, max_length=100)
    description: Optional[str] = None
    completed: Optional[bool] = None
    priority: Optional[PriorityLevel] = None
    status: Optional[BoardStatus] = None
    due_date: Optional[datetime] = None
    remind_at: Optional[datetime] = None
    board_id: Optional[int] = None
    tag_ids: Optional[List[int]] = None

class TodoResponse(TodoBase):
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None
    tags: List[TagResponse] = []
    subtasks: List[SubtaskResponse] = []

    class Config:
        from_attributes = True

class TodoBoardBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=100)
    description: Optional[str] = None

class TodoBoardCreate(TodoBoardBase):
    pass

class TodoBoardUpdate(BaseModel):
    name: Optional[str] = Field(None, min_length=1, max_length=100)
    description: Optional[str] = None

class TodoBoardResponse(TodoBoardBase):
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True

class TodoBoardDetailResponse(TodoBoardResponse):
    todos: List[TodoResponse] = []

    class Config:
        from_attributes = True

class HealthResponse(BaseModel):
    status: str