using System;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Windows.Forms;
using Discord;
using Discord.WebSocket;
using DML.AppCore;
using DML.AppCore.Classes;
using DML.Application.Classes;
using DML.Client;
using static SweetLib.Utils.Logger.Logger;

namespace DML.Application
{
    public partial class MainForm : Form
    {
        private bool IsInitialized { get; set; } = false;
        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Shown(object sender, System.EventArgs e)
        {
            Trace("MainForm shown executed.");
            RefreshComponents();

            IsInitialized = true;
        }

        private void RefreshComponents()
        {
            Debug("Refreshing components...");

            lbVersion.Text = $"v{Assembly.GetExecutingAssembly().GetName().Version} Copyright © by Serraniel"; 

            Trace("Refreshing operating folder component...");
            edOperatingFolder.Text = Core.Settings.OperatingFolder;

            Trace("Refreshing name scheme component...");
            edNameScheme.Text = Core.Settings.FileNameScheme;

            Trace("Refreshing skip existing files component...");
            cbSkipExisting.Checked = Core.Settings.SkipExistingFiles;

            Trace("Refreshing thread limit component...");
            edThreadLimit.Value = Core.Settings.ThreadLimit;

            if (cbGuild.Items.Count == 0)
            {
                Trace("Adding guilds to component...");
                cbGuild.Items.AddRange(DMLClient.Client.Guilds.OrderBy(g => g.Name).Select(g => g.Name).ToArray());
                cbGuild.SelectedIndex = 0;
                Trace("Guild component initialized.");
            }

            Trace("Refreshing job list component...");
            var oldIndex = lbxJobs.SelectedIndex;
            lbxJobs.Items.Clear();
            foreach (var job in Core.Scheduler.JobList)
            {
                lbxJobs.Items.Add(
                    $"{FindServerById(job.GuildId)?.Name}:{FindChannelById(FindServerById(job.GuildId), job.ChannelId)?.Name}");
            }
            lbxJobs.SelectedIndex = oldIndex;
        }

        private void DoSomethingChanged(object sender, System.EventArgs e)
        {
            Debug($"DoSomethingChanged excuted by {sender}.");
            if (!IsInitialized)
            {
                Trace("Form not initialized. Leaving DoSomethingChanged...");
                return;
            }

            Trace("Updating operating folder...");
            Core.Settings.OperatingFolder = edOperatingFolder.Text;

            Trace("Updating name scheme...");
            Core.Settings.FileNameScheme = edNameScheme.Text;

            Trace("Updating skip existing files...");
            Core.Settings.SkipExistingFiles = cbSkipExisting.Checked;

            Trace("Updating thread limit...");
            Core.Settings.ThreadLimit = (int)edThreadLimit.Value;

            Trace("Storing new settings...");
            Core.Settings.Store();

            Info("New settings have been saved.");
        }

        private void btnSearchFolders_Click(object sender, System.EventArgs e)
        {
            Trace("Operating folder button pressed.");
            using (var browserDialog = new FolderBrowserDialog())
            {
                Debug("Showing file browser dialog for operating folder...");

                browserDialog.SelectedPath = edOperatingFolder.Text;
                browserDialog.ShowNewFolderButton = true;
                browserDialog.Description = "Select an operating folder...";

                if (browserDialog.ShowDialog() == DialogResult.OK)
                {
                    edOperatingFolder.Text = browserDialog.SelectedPath;
                    Debug("Updated operating folder.");
                }
            }
        }

        private SocketGuild FindServerByName(string name)
        {
            Trace($"Trying to find server by name: {name}");
            return (from s in DMLClient.Client.Guilds where s.Name == name select s).FirstOrDefault();
        }

        private SocketTextChannel FindChannelByName(SocketGuild server, string name)
        {
            Trace($"Trying to find channel in {server} by name: {name}");
            return (from c in server.TextChannels where c.Name == name select c).FirstOrDefault();
        }

        private SocketGuild FindServerById(ulong id)
        {
            Trace($"Trying to find server by Id: {id}");
            return (from s in DMLClient.Client.Guilds where s.Id == id select s).FirstOrDefault();
        }

        private SocketTextChannel FindChannelById(SocketGuild server, ulong id)
        {
            Trace($"Trying to find channel in {server} by id: {id}");
            return (from c in server.TextChannels where c.Id == id select c).FirstOrDefault();
        }

        private void cbGuild_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            Trace("Guild index changed.");
            Debug("Updating channel dropdown component...");

            UseWaitCursor = true;
            try
            {
                var guild = FindServerByName(cbGuild.Text);

                if (guild != null)
                {
                    Trace("Cleaning channel component from old values...");
                    cbChannel.Items.Clear();

                    Trace("Adding new channels...");
                    cbChannel.Items.AddRange(guild.TextChannels.OrderBy(c => c.Position).Select(c => c.Name).ToArray());
                    Trace($"Added {cbChannel.Items.Count} channels.");

                    cbChannel.SelectedIndex = 0;
                }
                else
                {
                    Warn($"Guild {cbGuild.Text} could not be found!");
                }
            }
            finally
            {
                UseWaitCursor = false;
            }

            Debug("Finished updating channel dropdown component.");
        }

        private void btnAddJob_Click(object sender, System.EventArgs e)
        {
            var job = new Job
            {
                GuildId = FindServerByName(cbGuild.Text).Id,
                ChannelId = FindChannelByName(FindServerByName(cbGuild.Text), cbChannel.Text).Id
            };

            if (!(from j in Core.Scheduler.JobList
                  where j.GuildId == job.GuildId && j.ChannelId == job.ChannelId
                  select j).Any())
            {
                job.Store();
                Core.Scheduler.JobList.Add(job);
            }

            RefreshComponents();
        }

        private void btnDelete_Click(object sender, System.EventArgs e)
        {
            Trace("Deleting job pressed.");

            if (lbxJobs.SelectedIndex < 0)
            {
                Warn("No job selected.");
                MessageBox.Show("No job has been seleted.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }

            var jobNameData = lbxJobs.SelectedItem.ToString().Split(':');

            var guildName = "";
            for (var i = 0; i < jobNameData.Length - 1; i++)
                guildName += jobNameData[i] + ":";
            guildName = guildName.Substring(0, guildName.Length - 1);

            var channelName = jobNameData[jobNameData.Length - 1];

            var guild = FindServerByName(guildName);
            var channel = FindChannelByName(guild, channelName);

            foreach (var job in Core.Scheduler.JobList)
            {
                if (job.GuildId == guild.Id && job.ChannelId == channel.Id)
                {
                    Core.Scheduler.JobList.Remove(job);
                    Core.Scheduler.RunningJobs.Remove(job.Id);
                    job.Stop();
                    job.Delete();
                    break;
                }
            }

            lbxJobs.SelectedIndex = -1;
            RefreshComponents();
        }

        private void tmrRefreshProgress_Tick(object sender, System.EventArgs e)
        {
            var scanned = Core.Scheduler.MessagesScanned;
            var totalAttachments = Core.Scheduler.TotalAttachments;
            var done = Core.Scheduler.AttachmentsDownloaded;

            var progress = totalAttachments > 0 ? (int)(100 * done / totalAttachments) : 0;
            progress = Math.Min(Math.Max(0, progress), 100);
            pgbProgress.Maximum = 100;
            pgbProgress.Value = progress;

            lbProgress.Text = $"Scanned: {scanned} Downloaded: {done} Open: {totalAttachments - done}";
        }

        private void aboutToolStripMenuItem_Click(object sender, System.EventArgs e)
        {
            MessageBox.Show(Properties.Resources.AboutString);
        }

        private void visitGithubToolStripMenuItem_Click(object sender, System.EventArgs e)
        {
            Process.Start("https://github.com/Serraniel/DiscordMediaLoader/");
        }
    }
}