import uuid
from datetime import datetime
from typing import Literal

from pydantic import BaseModel, EmailStr, Field


class SignupRequest(BaseModel):
    email: EmailStr
    password: str = Field(min_length=8, max_length=200)
    display_name: str = Field(min_length=1, max_length=100)


class LoginRequest(BaseModel):
    email: EmailStr
    password: str


class TokenResponse(BaseModel):
    access_token: str
    token_type: str = "bearer"


class UserOut(BaseModel):
    id: uuid.UUID
    email: EmailStr
    display_name: str
    created_at: datetime

    class Config:
        from_attributes = True


class SongCreateRequest(BaseModel):
    title: str = Field(min_length=1, max_length=200)
    prompt: str = Field(min_length=1, max_length=2000)
    mode: Literal["instrumental", "vocals"] = "instrumental"
    lyrics: str | None = Field(default=None, max_length=4000)
    is_public: bool = False


class SongUpdateRequest(BaseModel):
    title: str | None = Field(default=None, min_length=1, max_length=200)
    is_public: bool | None = None


class SongOut(BaseModel):
    id: uuid.UUID
    user_id: uuid.UUID
    owner_display_name: str | None = None
    title: str
    prompt: str
    lyrics: str | None
    mode: str
    status: str
    error_message: str | None
    duration_seconds: float | None
    cover_seed: int
    is_public: bool
    like_count: int
    liked_by_me: bool = False
    audio_url: str | None = None
    created_at: datetime

    class Config:
        from_attributes = True


class SongListResponse(BaseModel):
    items: list[SongOut]
    total: int