# -*- coding: utf-8 -*-
"""Pydantic 스키마 + 공통 페이지네이션 응답."""
from datetime import datetime
from typing import Generic, TypeVar

from pydantic import BaseModel

T = TypeVar("T")


class PaginatedResponse(BaseModel, Generic[T]):
    items: list[T]
    total: int
    page: int
    page_size: int
    total_pages: int
    has_next: bool
    has_prev: bool

    @classmethod
    def create(cls, items: list[T], total: int, page: int, page_size: int) -> "PaginatedResponse[T]":
        total_pages = (total + page_size - 1) // page_size if page_size else 0
        return cls(
            items=items, total=total, page=page, page_size=page_size, total_pages=total_pages,
            has_next=page < total_pages, has_prev=page > 1,
        )


# ---- auth ----
class UserOut(BaseModel):
    user_uuid: str
    nickname: str
    email: str | None = None
    profile_image_url: str | None = None
    bio: str | None = None
    credits: int
    is_admin: bool = False


class ProfileUpdate(BaseModel):
    nickname: str | None = None
    profile_image_url: str | None = None   # data URL 또는 외부 URL, ""=기본으로 되돌림
    bio: str | None = None


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


# ---- content / feed ----
class FeedItem(BaseModel):
    id: str
    sc: str
    title: str
    video: str | None
    views: int
    likes: int
    liked: bool = False
    comments: int = 0
    mine: bool = False
    createdAt: datetime | None = None


# ---- create ----
class CreateReq(BaseModel):
    scenario: str
    input: str
    scenes: int = 12
    seconds: int = 45


# ---- comment ----
class CommentReq(BaseModel):
    body: str
    parent_id: int | None = None
    nickname: str | None = None


class ReplyItem(BaseModel):
    id: int
    body: str | None
    nickname: str
    is_mine: bool
    created_at: datetime


class CommentItem(BaseModel):
    id: int
    body: str | None
    nickname: str
    is_mine: bool
    created_at: datetime
    replies: list[ReplyItem] = []


# ---- credit ----
class CreditTx(BaseModel):
    amount: int
    balance_after: int
    type: str
    reason: str | None
    created_at: datetime


class ChargeReq(BaseModel):
    amount: int
    message: str | None = None