import time

from flask import jsonify, request

from llm_server.custom_redis import flask_cache
from . import bp
from ... import opts
from ...cluster.backend import get_backends_from_model, is_valid_model
from ...cluster.cluster_config import cluster_config, get_a_cluster_backend


@bp.route('/v1/model', methods=['GET'])
@bp.route('/<model_name>/v1/model', methods=['GET'])
def get_model(model_name=None):
    # We will manage caching ourself since we don't want to cache
    # when the backend is down. Also, Cloudflare won't cache 500 errors.
    cache_key = 'model_cache::' + request.url
    cached_response = flask_cache.get(cache_key)

    if cached_response:
        return cached_response

    if not model_name:
        model_name = cluster_config.get_backend(get_a_cluster_backend()).get('model')

    if not is_valid_model(model_name):
        response = jsonify({
            'code': 400,
            'msg': 'Model does not exist.',
        }), 400
    else:
        num_backends = len(get_backends_from_model(model_name))
        response = jsonify({
            'result': opts.manual_model_name if opts.manual_model_name else model_name,
            'model_backend_count': num_backends,
            'timestamp': int(time.time())
        }), 200
        flask_cache.set(cache_key, response, timeout=60)

    return response