using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Threading.Tasks;
using System.Xml.Linq;
using JD.MicrosoftAchievement.Service.Extension;
using Plume.Interfaces.Services;

namespace JD.MicrosoftAchievement.Service
{
    public sealed class MicrosoftAchievementService : IMicrosoftAchievementService
    {
        #region IMicrosoftAchievementService

        public Task<Achievement[]> ReadAchievementsAsync(string settingsFilePath) => Task.Run(() =>
        {
            if (settingsFilePath is null)
            {
                throw new ArgumentNullException(nameof(settingsFilePath));
            }
            if (!File.Exists(settingsFilePath))
            {
                throw new ArgumentException($"Settings file \"{settingsFilePath}\" does not exists", nameof(settingsFilePath));
            }

            List<Achievement> achievements = new List<Achievement>();

            using (ZipArchive archive = ZipFile.OpenRead(settingsFilePath))
            {
                ZipArchiveEntry entry = archive.Entries.FirstOrDefault(e => e.Name == "achievements2017.xml");
                if (entry is null) throw new ArgumentException($"Could not find \"achievements2017.xml\" in settings file \"{settingsFilePath}\"", nameof(settingsFilePath));

                using (Stream stream = entry.Open())
                {
                    XDocument document = XDocument.Load(stream);

                    foreach (XElement element in document.Root.GetElements("Achievement"))
                    {
                        achievements.Add(new Achievement(
                            int.TryParse(element.GetElement("AchievementId")?.Value, out int id) ? id : -1,
                            element.GetElement("AchievementNameId")?.Value,
                            element.GetElement("LockedDescriptionId")?.Value,
                            element.GetElement("UnlockedDescriptionId")?.Value,
                            element.GetElement("IsHidden")?.Value == "true",
                            element.GetElement("BaseAchievement")?.Value == "true",
                            int.TryParse(element.GetElement("Rewards").GetElement("Gamerscore")?.Value, out int gamerscore) ? gamerscore : 0));
                    }
                }
            }

            return achievements.ToArray();
        });

        public Task UpdateAchievementsAsync(string settingsFilePath, Achievement[] achievements) => Task.Run(() =>
        {
            if (settingsFilePath is null)
            {
                throw new ArgumentNullException(nameof(settingsFilePath));
            }
            if (achievements is null)
            {
                throw new ArgumentNullException(nameof(achievements));
            }
            if (!File.Exists(settingsFilePath))
            {
                throw new ArgumentException($"Settings file \"{settingsFilePath}\" does not exist", nameof(settingsFilePath));
            }

            FileInfo settingsFile = new FileInfo(settingsFilePath);
            settingsFile.Attributes &= ~FileAttributes.ReadOnly;

            using (ZipArchive archive = ZipFile.Open(settingsFilePath, ZipArchiveMode.Update))
            {
                ZipArchiveEntry entry = archive.Entries.FirstOrDefault(e => e.FullName == "achievements2017.xml");
                if (entry is null) throw new ArgumentException($"Could not find \"achievements2017.xml\" in settings file \"{settingsFilePath}\"", nameof(settingsFilePath));

                XDocument document;

                using (Stream stream = entry.Open())
                {
                    document = XDocument.Load(stream);
                }

                Dictionary<int, Achievement> achievementsById = achievements.ToDictionary(a => a.Id);

                foreach (XElement element in document.Root.GetElements("Achievement"))
                {
                    if (int.TryParse(element.GetElement("AchievementId")?.Value, out int id)
                        && achievementsById.TryGetValue(id, out Achievement achievement))
                    {
                        element.UpdateOrAddElement("IsHidden", achievement.IsSecret ? "true" : "false");
                        element.UpdateOrAddElement("BaseAchievement", achievement.IsBaseAchievement ? "true" : "false");
                        element.UpdateOrAddElement("Rewards", null).UpdateOrAddElement("Gamerscore", achievement.Gamerscore.ToString());
                    }
                }

                entry.Delete();
                using (Stream stream = archive.CreateEntry(entry.Name).Open())
                {
                    document.Save(stream);
                }
            }
        });

        public Task UpdateLocalizationAsync(string settingsFilePath, LocalizedString[] localizedStrings) => Task.Run(() =>
        {
            if (settingsFilePath is null)
            {
                throw new ArgumentNullException(nameof(settingsFilePath));
            }
            if (localizedStrings is null)
            {
                throw new ArgumentNullException(nameof(localizedStrings));
            }
            if (!File.Exists(settingsFilePath))
            {
                throw new ArgumentException($"Settings file \"{settingsFilePath}\" does not exists", nameof(settingsFilePath));
            }

            FileInfo settingsFile = new FileInfo(settingsFilePath);
            settingsFile.Attributes &= ~FileAttributes.ReadOnly;

            using (ZipArchive archive = ZipFile.Open(settingsFilePath, ZipArchiveMode.Update))
            {
                ZipArchiveEntry entry = archive.Entries.FirstOrDefault(e => e.FullName == "localization.xml");
                if (entry is null) throw new ArgumentException($"Could not find \"localization.xml\" in settings file \"{settingsFilePath}\"", nameof(settingsFilePath));

                XDocument document;

                using (Stream stream = entry.Open())
                {
                    document = XDocument.Load(stream);
                }

                Dictionary<string, LocalizedString> localizedStringsById = localizedStrings.ToDictionary(a => a.Id);

                foreach (XElement element in document.Root.GetElements("LocalizedString"))
                {
                    if (localizedStringsById.TryGetValue(element.Attribute("id")?.Value, out LocalizedString localizedString))
                    {
                        element.RemoveNodes();

                        foreach (KeyValuePair<string, string> pair in localizedString.Values)
                        {
                            element.AddElement("Value", pair.Value).SetAttributeValue("locale", pair.Key);
                        }
                    }
                }

                entry.Delete();
                using (Stream stream = archive.CreateEntry(entry.Name).Open())
                {
                    document.Save(stream);
                }
            }
        });

        #endregion

        #region IService

        public void Initialize(IServiceContext serviceContext)
        { }

        #endregion

        #region IDisposable

        public void Dispose()
        { }

        #endregion
    }
}