"""笔记相关路由"""
from fastapi import APIRouter, Depends, HTTPException, Request
from sqlalchemy.orm import Session
from models import get_db, Note
from middleware.user_context import UserContext

router = APIRouter(tags=["笔记"])


@router.get("/api/notes")
def list_notes(folder_id: int = None, db: Session = Depends(get_db), request: Request = None):
    """获取笔记列表（仅当前用户）"""
    user_id = UserContext.get_user_id(request)
    q = db.query(Note).filter(Note.created_by == user_id)
    if folder_id:
        q = q.filter(Note.folder_id == folder_id)
    return q.order_by(Note.updated_at.desc()).all()


@router.post("/api/notes")
def create_note(data: dict, db: Session = Depends(get_db), request: Request = None):
    """创建笔记"""
    user_id = UserContext.get_user_id(request)
    note = Note(
        title=data.get("title", "无标题"),
        content=data.get("content", ""),
        folder_id=data.get("folder_id"),
        created_by=user_id,
        updated_by=user_id,
    )
    db.add(note)
    db.commit()
    db.refresh(note)
    return {"id": note.id, "title": note.title, "content": note.content,
            "folder_id": note.folder_id, "created_by": note.created_by, "updated_by": note.updated_by,
            "created_at": str(note.created_at), "updated_at": str(note.updated_at)}


@router.get("/api/notes/{note_id}")
def get_note(note_id: int, db: Session = Depends(get_db), request: Request = None):
    """获取单个笔记"""
    user_id = UserContext.get_user_id(request)
    note = db.query(Note).filter(Note.id == note_id, Note.created_by == user_id).first()
    if not note:
        raise HTTPException(404, "笔记不存在")
    return {"id": note.id, "title": note.title, "content": note.content,
            "folder_id": note.folder_id, "created_by": note.created_by, "updated_by": note.updated_by,
            "created_at": str(note.created_at), "updated_at": str(note.updated_at)}


@router.put("/api/notes/{note_id}")
def update_note(note_id: int, data: dict, db: Session = Depends(get_db), request: Request = None):
    """更新笔记"""
    user_id = UserContext.get_user_id(request)
    note = db.query(Note).filter(Note.id == note_id, Note.created_by == user_id).first()
    if not note:
        raise HTTPException(404, "笔记不存在")
    if "title" in data:
        note.title = data["title"]
    if "content" in data:
        note.content = data["content"]
    if "folder_id" in data:
        note.folder_id = data["folder_id"]
    note.updated_by = user_id
    db.commit()
    db.refresh(note)
    return {"ok": True}


@router.delete("/api/notes/{note_id}")
def delete_note(note_id: int, db: Session = Depends(get_db), request: Request = None):
    """删除笔记"""
    user_id = UserContext.get_user_id(request)
    note = db.query(Note).filter(Note.id == note_id, Note.created_by == user_id).first()
    if not note:
        raise HTTPException(404, "笔记不存在")
    db.delete(note)
    db.commit()
    return {"ok": True}


# ===== 分享 =====
import secrets

@router.post("/api/notes/{note_id}/share")
def share_note(note_id: int, data: dict = {}, db: Session = Depends(get_db), request: Request = None):
    """生成/刷新分享链接，可设置有效期"""
    from datetime import datetime, timedelta
    user_id = UserContext.get_user_id(request)
    note = db.query(Note).filter(Note.id == note_id, Note.created_by == user_id).first()
    if not note:
        raise HTTPException(404, "笔记不存在")
    note.share_token = secrets.token_urlsafe(16)

    # 有效期: 7d / 30d / 1y / forever
    ttl = data.get("ttl", "forever")
    if ttl == "7d":
        note.share_expires_at = datetime.utcnow() + timedelta(days=7)
    elif ttl == "30d":
        note.share_expires_at = datetime.utcnow() + timedelta(days=30)
    elif ttl == "1y":
        note.share_expires_at = datetime.utcnow() + timedelta(days=365)
    else:
        note.share_expires_at = None  # 永久

    db.commit()
    return {
        "share_token": note.share_token,
        "url": f"/share/{note.share_token}",
        "expires_at": note.share_expires_at.strftime("%Y-%m-%d %H:%M") if note.share_expires_at else "永久有效",
    }


@router.delete("/api/notes/{note_id}/share")
def unshare_note(note_id: int, db: Session = Depends(get_db), request: Request = None):
    """取消分享"""
    user_id = UserContext.get_user_id(request)
    note = db.query(Note).filter(Note.id == note_id, Note.created_by == user_id).first()
    if not note:
        raise HTTPException(404, "笔记不存在")
    note.share_token = None
    db.commit()
    return {"ok": True}


# ===== 移动 =====
@router.put("/api/notes/{note_id}/move")
def move_note(note_id: int, data: dict, db: Session = Depends(get_db), request: Request = None):
    """移动笔记到另一个文件夹"""
    user_id = UserContext.get_user_id(request)
    note = db.query(Note).filter(Note.id == note_id, Note.created_by == user_id).first()
    if not note:
        raise HTTPException(404, "笔记不存在")
    note.folder_id = data.get("folder_id")
    db.commit()
    return {"ok": True, "folder_id": note.folder_id}


# ===== 分享管理 =====
@router.get("/api/shares")
def list_shares(db: Session = Depends(get_db), request: Request = None):
    """列出当前用户已分享的笔记"""
    user_id = UserContext.get_user_id(request)
    notes = db.query(Note).filter(
        Note.share_token.isnot(None),
        Note.created_by == user_id,
    ).order_by(Note.updated_at.desc()).all()
    result = []
    for n in notes:
        result.append({
            "id": n.id,
            "title": n.title,
            "share_token": n.share_token,
            "share_url": f"/share/{n.share_token}",
            "share_expires_at": n.share_expires_at.strftime("%Y-%m-%d %H:%M") if n.share_expires_at else "永久有效",
            "created_by": n.created_by,
            "updated_at": str(n.updated_at),
        })
    return result