from fastapi import APIRouter, Header, HTTPException, status
from pydantic import BaseModel

from backend.app.services.link_service import create_link, list_public_links, list_tags, update_link
from backend.app.services.plugin_manager import plugin_manager
from backend.app.services.token_service import validate_token

router = APIRouter()


class LinkCreate(BaseModel):
    title: str
    url: str
    comment: str = ''
    timestamp: str | None = None
    tags: list[str] = []


class LinkUpdate(BaseModel):
    title: str
    url: str
    comment: str = ''
    tags: list[str] = []


@router.get('/tags')
def available_tags():
    return list_tags()


@router.post('/links', status_code=status.HTTP_201_CREATED)
def create_link_endpoint(payload: LinkCreate, authorization: str | None = Header(default=None)):
    if not authorization or not authorization.startswith('Bearer '):
        raise HTTPException(status_code=401, detail='Missing or invalid Authorization header')
    token = authorization.replace('Bearer ', '', 1)
    info = validate_token(token)
    if info is None:
        raise HTTPException(status_code=401, detail='Token expired or invalid')

    try:
        record = create_link(info['user_id'], payload.title, payload.url, payload.comment, payload.timestamp, payload.tags)
    except ValueError as error:
        raise HTTPException(status_code=422, detail=str(error)) from error
    plugin_manager.dispatch({'type': 'link_created', **record})
    return record


@router.put('/links/{link_id}')
def update_link_endpoint(
    link_id: str,
    payload: LinkUpdate,
    authorization: str | None = Header(default=None),
):
    if not authorization or not authorization.startswith('Bearer '):
        raise HTTPException(status_code=401, detail='Missing or invalid Authorization header')
    info = validate_token(authorization.replace('Bearer ', '', 1))
    if info is None:
        raise HTTPException(status_code=401, detail='Token expired or invalid')

    try:
        record = update_link(link_id, info['user_id'], payload.title, payload.url, payload.comment, payload.tags)
    except ValueError as error:
        raise HTTPException(status_code=422, detail=str(error)) from error
    if record is None:
        raise HTTPException(status_code=404, detail='Link not found or not owned by user')
    return record


@router.get('/links')
def list_links():
    return list_public_links()