/**
 * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
 *
 * You are hereby granted a non-exclusive, worldwide, royalty-free license to use,
 * copy, modify, and distribute this software in source code or binary form for use
 * in connection with the web services and APIs provided by Facebook.
 *
 * As with any software that integrates with the Facebook platform, your use of
 * this software is subject to the Facebook Developer Principles and Policies
 * [http://developers.facebook.com/policy/]. This copyright notice shall be
 * included in all copies or substantial portions of the software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

namespace Facebook.Unity
{
    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.Globalization;
    using System.Linq;

    internal static class Utilities
    {
        private const string WarningMissingParameter = "Did not find expected value '{0}' in dictionary";

        public static bool TryGetValue<T>(
            this IDictionary<string, object> dictionary,
            string key,
            out T value)
        {
            object resultObj;
            if (dictionary.TryGetValue(key, out resultObj) && resultObj is T)
            {
                value = (T)resultObj;
                return true;
            }

            value = default(T);
            return false;
        }

        public static long TotalSeconds(this DateTime dateTime)
        {
            TimeSpan t = dateTime - new DateTime(1970, 1, 1);
            long secondsSinceEpoch = (long)t.TotalSeconds;
            return secondsSinceEpoch;
        }

        public static T GetValueOrDefault<T>(
            this IDictionary<string, object> dictionary,
            string key,
            bool logWarning = true)
        {
            T result;
            if (!dictionary.TryGetValue<T>(key, out result))
            {
                FacebookLogger.Warn(WarningMissingParameter, key);
            }

            return result;
        }

        public static string ToCommaSeparateList(this IEnumerable<string> list)
        {
            if (list == null)
            {
                return string.Empty;
            }

            return string.Join(",", list.ToArray());
        }

        public static string AbsoluteUrlOrEmptyString(this Uri uri)
        {
            if (uri == null)
            {
                return string.Empty;
            }

            return uri.AbsoluteUri;
        }

        public static string GetUserAgent(string productName, string productVersion)
        {
            return string.Format(
                CultureInfo.InvariantCulture,
                "{0}/{1}",
                productName,
                productVersion);
        }
    }
}