using GCMM.Properties;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GCMM
{
    partial class MainForm
    {

        public void GetInstalledMods()
        {
            foreach (var modPath in Directory.GetFiles(Settings.Default.GamePath + @"\Plugins", "*.dll"))
            {
                try
                {
                    var an = AssemblyName.GetAssemblyName(modPath);
                    if (an.Name == "0Harmony") continue;
                    AddUpdateModInList(new ModInfo { Name = an.Name, Version = an.Version.ToString(), LastUpdated = File.GetLastWriteTime(modPath) });
                }
                catch (BadImageFormatException)
                { //Not a .NET assembly
                }
            }
        }

        public async void GetAvailableMods()
        {
            string reposURL = "/api/v1/repos/search?sort=updated&order=desc";
            using (var client = GetClient())
            {
                var obj = JObject.Parse(await client.DownloadStringTaskAsync(reposURL));
                if (!(bool)obj["ok"]) return;
                foreach (var repo in obj["data"])
                {
                    var mod = new ModInfo
                    {
                        Name = repo["name"].ToString(),
                        Author = repo["owner"]["username"].ToString(),
                        LastUpdated = (DateTime)repo["updated_at"]
                    };
                    if (await FetchModInfo(mod)) //If it's actually a mod
                        AddUpdateModInList(mod);
                }
            }
        }

        public async Task<bool> FetchModInfo(ModInfo mod)
        {
            string repoURL = "/api/v1/repos/" + mod.Author + "/" + mod.Name + "/releases";
            using (var client = GetClient())
            {
                var obj = JArray.Parse(await client.DownloadStringTaskAsync(repoURL));
                var release = obj.FirstOrDefault(rel => !(bool)rel["prerelease"] && !(bool)rel["draft"]);
                if (release == null)
                    return false;
                else
                {
                    mod.DownloadURL = release["assets"].First["browser_download_url"].ToString();
                    mod.LastUpdated = (DateTime)release["published_at"];
                    mod.LatestVersion = release["tag_name"].ToString().Replace("v", "");
                    return true;
                }
            }
        }

        public void AddUpdateModInList(ModInfo mod)
        {
            if (mods.ContainsKey(mod.Name) ^ modlist.Items.ContainsKey(mod.Name))
                throw new InvalidOperationException("The mod isn't present in one of the two places: " + mod.Name);
            if (modlist.Items.ContainsKey(mod.Name))
            {
                var omod = mods[mod.Name];
                var item = modlist.Items[mod.Name];
                var items = item.SubItems;
                omod.Author = mod.Author ?? omod.Author;
                omod.Version = mod.Version ?? omod.Version;
                omod.LatestVersion = mod.LatestVersion ?? omod.LatestVersion;
                omod.LastUpdated = mod.LastUpdated == default ? omod.LastUpdated : mod.LastUpdated;
                items[1].Text = omod.Author ?? "";
                items[2].Text = omod.Version ?? omod.LatestVersion;
                items[3].Text = omod.LastUpdated.ToString();
                item.Group = omod.Installed ? modlist.Groups["installed"] : modlist.Groups["available"];
                if (mod.Version != mod.LatestVersion)
                    items[2].ForeColor = Color.Red;
            }
            else
            {
                mods.Add(mod.Name, mod);
                var item = new ListViewItem(new[] { mod.Name, mod.Author ?? "", mod.Version ?? mod.LatestVersion ?? "", mod.LastUpdated.ToString() }, modlist.Groups[mod.Installed ? "installed" : "available"]);
                item.Name = mod.Name;
                modlist.Items.Add(item);
            }
        }

        public void RemoveModFromList(ModInfo mod)
        {
            if (mods.Remove(mod.Name))
                modlist.Items.RemoveByKey(mod.Name);
        }
    }
}