"""用户数据 JSON API — 收藏、阅读状态、笔记。"""

from __future__ import annotations

from fastapi import APIRouter, Depends, HTTPException, Request
from fastapi.responses import HTMLResponse
from pydantic import BaseModel
from sqlalchemy.orm import Session

from app.database import get_db
from app.services.user_data import (
    get_note,
    save_note,
    set_reading_status,
    toggle_bookmark,
)

router = APIRouter(prefix="/api", tags=["user-data"])


# ── 请求模型 ──────────────────────────────────────────────────────────


class ReadingStatusRequest(BaseModel):
    status: str


class NoteRequest(BaseModel):
    content: str


# ── 收藏 ──────────────────────────────────────────────────────────────


@router.post("/bookmark/{arxiv_id}")
def bookmark_toggle(arxiv_id: str, request: Request, db: Session = Depends(get_db)):
    """切换收藏状态。支持 HTMX 局部刷新和 JSON 响应。"""
    result = toggle_bookmark(db, arxiv_id)

    if "error" in result:
        raise HTTPException(status_code=404, detail=result["error"])

    # HTMX 请求 → 返回 HTML 片段
    if request.headers.get("HX-Request"):
        star = "★" if result["bookmarked"] else "☆"
        active_class = " active" if result["bookmarked"] else ""
        html = (
            f'<button class="btn-bookmark{active_class}" '
            f'hx-post="/api/bookmark/{arxiv_id}" '
            f'hx-target="#user-data-{arxiv_id}" '
            f'hx-swap="outerHTML">'
            f"{star}</button>"
        )
        return HTMLResponse(content=html)

    return result


# ── 阅读状态 ──────────────────────────────────────────────────────────


@router.post("/reading-status/{arxiv_id}")
def reading_status_update(
    arxiv_id: str,
    body: ReadingStatusRequest,
    db: Session = Depends(get_db),
):
    """更新阅读状态。"""
    result = set_reading_status(db, arxiv_id, body.status)

    if "error" in result:
        if result["error"] == "not_found":
            raise HTTPException(status_code=404, detail="Paper not found")
        elif result["error"] == "invalid_status":
            raise HTTPException(
                status_code=422,
                detail=f"Invalid status. Valid: {result['valid']}",
            )

    return result


# ── 笔记 ──────────────────────────────────────────────────────────────


@router.get("/note/{arxiv_id}")
def note_get(arxiv_id: str, db: Session = Depends(get_db)):
    """获取笔记。"""
    result = get_note(db, arxiv_id)
    if result is None:
        raise HTTPException(status_code=404, detail="Paper not found")
    return result


@router.post("/note/{arxiv_id}")
def note_save(arxiv_id: str, body: NoteRequest, db: Session = Depends(get_db)):
    """保存笔记。"""
    result = save_note(db, arxiv_id, body.content)

    if "error" in result:
        raise HTTPException(status_code=404, detail=result["error"])

    return result