from flask import Blueprint, request, url_for
from ..lib.babycode import babycode_to_html
from ..constants import REACTION_EMOJI
from .users import is_logged_in, get_active_user
from ..models import APIRateLimits, Threads, Reactions
from ..db import db

bp = Blueprint("api", __name__, url_prefix="/api/")


@bp.post('/thread-updates/<thread_id>')
def thread_updates(thread_id):
    thread = Threads.find({'id': thread_id})
    if not thread:
        return {'error': 'no such thread'}, 404
    target_time = request.json.get('since')
    if not target_time:
        return {'error': 'missing parameter "since"'}, 400
    try:
        target_time = int(target_time)
    except:
        return {'error': 'parameter "since" is not/cannot be converted to a number'}, 400

    q = 'SELECT id FROM posts WHERE thread_id = ? AND posts.created_at > ? ORDER BY posts.created_at ASC LIMIT 1'
    new_post = db.fetch_one(q, thread_id, target_time)
    if not new_post:
        return {'status': 'none'}

    url = url_for('threads.thread', slug=thread.slug, after=new_post['id'], _anchor=f"post-{new_post['id']}")
    return {'status': 'new_post', 'url': url}


@bp.post('/babycode-preview')
def babycode_preview():
    if not is_logged_in():
        return {'error': 'not authorized'}, 401
    user = get_active_user()
    if not APIRateLimits.is_allowed(user.id, 'babycode_preview', 5):
        return {'error': 'too many requests'}, 429
    markup = request.json.get('markup')
    if not markup or not isinstance(markup, str):
        return {'error': 'markup field missing or invalid type'}, 400
    rendered = babycode_to_html(markup)
    return {'html': rendered}


@bp.post('/add-reaction/<post_id>')
def add_reaction(post_id):
    if not is_logged_in():
        return {'error': 'not authorized', 'error_code': 401}, 401
    user = get_active_user()
    reaction_text = request.json.get('emoji')
    if not reaction_text or not isinstance(reaction_text, str):
        return {'error': 'emoji field missing or invalid type', 'error_code': 400}, 400
    if reaction_text not in REACTION_EMOJI:
        return {'error': 'unsupported reaction', 'error_code': 400}, 400

    reaction = Reactions.find({
        'user_id': user.id,
        'post_id': int(post_id),
        'reaction_text': reaction_text,
    })

    if reaction:
        return {'error': 'reaction already exists', 'error_code': 409}, 409

    reaction = Reactions.create({
        'user_id': user.id,
        'post_id': int(post_id),
        'reaction_text': reaction_text,
    })

    return {'status': 'added'}


@bp.post('/remove-reaction/<post_id>')
def remove_reaction(post_id):
    if not is_logged_in():
        return {'error': 'not authorized'}, 401
    user = get_active_user()
    reaction_text = request.json.get('emoji')
    if not reaction_text or not isinstance(reaction_text, str):
        return {'error': 'emoji field missing or invalid type'}, 400
    if reaction_text not in REACTION_EMOJI:
        return {'error': 'unsupported reaction'}, 400

    reaction = Reactions.find({
        'user_id': user.id,
        'post_id': int(post_id),
        'reaction_text': reaction_text,
    })

    if not reaction:
        return {'error': 'reaction does not exist'}, 404

    reaction.delete()

    return {'status': 'removed'}