using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.IO;
using System.Linq;
using System.Drawing;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DataOrganizer
{
    public partial class FileManager : Form
    {
        private List<DB.Profile> Profiles { get; set; } = new List<DB.Profile>();
        private List<DB.FolderGroup> FolderGroups { get; set; } = new List<DB.FolderGroup>();
        private Snapshot ActiveSnapshot { get; set; }
        private Snapshot ComparisionSnapshot { get; set; }
        private Dictionary<string, TreeNode> DiffTreeNodes { get; set; } = new Dictionary<string, TreeNode>();

        public FileManager()
        {
            InitializeComponent();

            ScanSelectedFolderGroupButton.Click += ScanSelectedFolderGroupButton_Click;
            SelectProfileComboBoxMainMenu.SelectedIndexChanged += SelectProfileComboBoxMainMenu_SelectedIndexChanged;
            SelectFolderGroupComboBoxMainMenu.SelectedIndexChanged += SelectFolderGroupComboBoxMainMenu_SelectedIndexChanged;
            CompareAgainstProfileComboBox.SelectedIndexChanged += CompareAgainstProfileComboBox_SelectedIndexChanged;
            CompareAgainstFolderGroupComboBox.SelectedIndexChanged += CompareAgainstFolderGroupComboBox_SelectedIndexChanged;
            CompareButton.Click += CompareButton_Click;
            DiffViewTreeView.NodeMouseClick += DiffViewTreeView_NodeMouseClick;

            PopulateProfileComboBox();
        }

        private void DiffViewTreeView_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            if (!ActiveSnapshot.TopLevelFolders.ContainsKey(e.Node.Name)) return;

            SelectedFolderViewGroupTreeView.Nodes.Clear();
            ComparisionFolderViewTreeView.Nodes.Clear();

            var folderA = ActiveSnapshot.Directories[e.Node.Name];
            var folderB = ComparisionSnapshot.Directories[e.Node.Name];

            SelectedFolderViewGroupTreeView.Nodes.Add(BuildTreeNode(folderA));
            ComparisionFolderViewTreeView.Nodes.Add(BuildTreeNode(folderB));
        }

        private void ScanSelectedFolderGroupButton_Click(object sender, EventArgs e)
        {
            var folderGroup = GetSelectedFolderGroup();
            var files = GetAllFilesFromDirectory(new DirectoryInfo(folderGroup.Path));
            var snapshot = new Snapshot(files, folderGroup);

            foreach (var folder in snapshot.Root.Folders.Values)
                DiffViewTreeView.Nodes.Add(BuildTreeNode(folder));

            CommitFilesChangesButton.Enabled = true;
            MoveNewFilesButton.Enabled = true;

            if (ActiveSnapshot.Files.Count == 0) CommitFirstTimeScaneToDatabase(snapshot);

            //TODO: reload the form to have these changes active in the global snapshot
        }

        private void CommitFirstTimeScaneToDatabase(Snapshot snapshot)
        {
            var db = new DB();
            db.InsertNewFileRecord(snapshot.Files.Values.ToList(), GetSelectedProfile().Id, GetSelectedFolderGroup().Id, GetSelectedFolderGroup().Path);
            ClearForm();
            UpdateStatusLabel($"Committed {snapshot.Files.Count} records to the database.");
        }

        private void CompareButton_Click(object sender, EventArgs e)
        {
            var db = new DB();
            var p = GetProfileToCompare();
            var f = GetFolderGroupToCompare();
            var renames = new List<SnapshotComparsion.RenamedFile>();
            ComparisionSnapshot = new Snapshot(db.GetFilesForProfileByFolderGroup(p.Id, f.Id), f);
            var diff = ActiveSnapshot.Diff(ComparisionSnapshot);

            foreach (var folder in ActiveSnapshot.Directories.Values)
            {
                if (!folder.IsRootFolder)
                {
                    var noRoot = folder.FullPath.Remove(0, ActiveSnapshot.Root.FullPath.Length + 1);
                    var w = Path.Combine(f.Path, noRoot);

                    if (ComparisionSnapshot.Directories.ContainsKey(w))
                    {
                        renames.AddRange(ActiveSnapshot.FindFileRenames(folder, ComparisionSnapshot.Directories[w]));
                    }
                }
                else
                {
                    var compareRoot = ComparisionSnapshot.Directories.Single(x => x.Value.IsRootFolder).Value;

                    renames.AddRange(ActiveSnapshot.FindFileRenames(folder, compareRoot));
                }
            }

            foreach (var rename in renames)
            {
                DiffViewTreeView.Nodes.Add($"From: {rename.From.Name}");
                DiffViewTreeView.Nodes.Add($"To: {rename.To.Name}");
            }
            var dupCount = 0;

            //foreach(var folder in ActiveSnapshot.TopLevelFolders.Keys)
            //{
            //    foreach(var dup in ActiveSnapshot.FindDuplicates(ActiveSnapshot.Directories[folder]))
            //    {
            //        var node = new TreeNode($"{dup.File.Name} ({dup.Duplicates.Count})") { ToolTipText = dup.File.FullPath };
            //        foreach(var d in dup.Duplicates)
            //        {
            //            node.Nodes.Add(new TreeNode(d.Name) { ToolTipText = d.FullPath });
            //            dupCount++;
            //        }
            //        DiffViewTreeView.Nodes.Add(node);
            //    }
            //}
            UpdateStatusLabel($"Found {dupCount} duplicate files.");
            //foreach(var file in diff.NewFiles)
            //    AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingInsert);

            //foreach (var file in diff.ModifiedFiles)
            //    AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingUpdate);

            //foreach (var file in diff.DeletedFiles)
            //    AddFileSnapshotToDiffView(file, GetSelectedFolderGroup(), FileSnapshot.FileStatus.PendingDelete);
        }

        private void AddFileSnapshotToDiffView(FileSnapshot file, DB.FolderGroup folderGroup, FileSnapshot.FileStatus fileStatus = FileSnapshot.FileStatus.None)
        {
            var folder = file.ParentFolder;

            while (folder != null)
            {
                if (folder.FullPath == folderGroup.Path) break;

                var n = new TreeNode(folder.Name) { Name = folder.FullPath };
                if (!DiffTreeNodes.ContainsKey(n.Name))
                {
                    if(folder.Parent != null && folder.Parent.FullPath == folderGroup.Path)
                    {
                        DiffViewTreeView.Nodes.Add(n);
                    }
                    DiffTreeNodes.Add(n.Name, n);
                }

                folder = folder.Parent;
            }

            var node = new TreeNode(file.Name) { Name = file.FullPath };
            DiffTreeNodes.Add(file.FullPath, node);
            DiffTreeNodes[file.ParentFolder.FullPath].Nodes.Add(node);

            switch (fileStatus)
            {
                case FileSnapshot.FileStatus.PendingInsert:
                    node.BackColor = Color.LightBlue;
                    break;
                case FileSnapshot.FileStatus.PendingUpdate:
                    node.BackColor = Color.Orange;
                    node.ForeColor = Color.White;
                    break;
                case FileSnapshot.FileStatus.PendingDelete:
                    node.BackColor = Color.Red;
                    break;
            }
        }

        private void CompareAgainstProfileComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            ClearDiffResults();

            CompareAgainstFolderGroupComboBox.Items.Clear();

            var profile = GetProfileToCompare();

            foreach(var folder in profile.FolderGroups)
                CompareAgainstFolderGroupComboBox.Items.Add(folder.Name);

            if(profile.FolderGroups.Count > 0) CompareAgainstFolderGroupComboBox.SelectedIndex = 0;
        }

        private void CompareAgainstFolderGroupComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            ClearDiffResults();

            CompareButton.Enabled = ActiveSnapshot.Files.Count > 0;

            ComparisionFolderViewGroupBox.Text = $"Folder View of {GetProfileToCompare().Name}:";
        }

        private void SelectFolderGroupComboBoxMainMenu_SelectedIndexChanged(object sender, EventArgs e)
        {
            ClearForm(true);

            var db = new DB();
            var folderGroup = GetSelectedFolderGroup();

            var files = db.GetFilesForProfileByFolderGroup(GetSelectedProfile().Id, folderGroup.Id);
            ActiveSnapshot = new Snapshot(files, folderGroup);

            //foreach (var orgFolder in ActiveSnapshot.Root.Folders.Values)
            //{
            //    FolderGroupTreeView.Nodes.Add(BuildTreeNode(orgFolder));
            //}

            CompareButton.Enabled = files.Count > 0;

            if (CompareAgainstFolderGroupComboBox.FindString(folderGroup.Name) != -1)
                CompareAgainstFolderGroupComboBox.SelectedIndex = CompareAgainstFolderGroupComboBox.FindString(folderGroup.Name);

            if (files.Count == 0) 
                ScanSelectedFolderGroupButton.Text = "Scan Folder Group";

            SelectedProfileDataLabel.Text = $"Loaded snapshot data for {files.Count} file(s).";
            SelectedGroupFolderViewGroupBox.Text = $"Folder View of {GetSelectedProfile().Name}:";
        }

        private TreeNode BuildTreeNode(Folder folder)
        {
            var node = new TreeNode(folder.Name) { Name = folder.FullPath };

            foreach(var dir in folder.Folders.Values)
            {
                node.Nodes.Add(BuildTreeNode(dir));
            }

            foreach(var file in folder.Files.Values)
            {
                node.Nodes.Add(new TreeNode(file.Name) { Name = file.FullPath });
            }

            return node;
        }

        private List<FileInfo> GetAllFilesFromDirectory(DirectoryInfo directory)
        {
            var files = new List<FileInfo>();

            files.AddRange(directory.EnumerateFiles());

            foreach (var dir in directory.EnumerateDirectories())
            {
                UpdateStatusLabel($"Scanning Directory {dir.Name}...");
                files.AddRange(GetAllFilesFromDirectory(dir));
            }

            return files;
        }

        private void SelectProfileComboBoxMainMenu_SelectedIndexChanged(object sender, EventArgs e)
        {
            ClearForm();

            FolderGroups = GetSelectedProfile().FolderGroups;

            SelectFolderGroupComboBoxMainMenu.Items.Clear();
            CompareAgainstProfileComboBox.Items.Clear();

            foreach (var folder in FolderGroups)
                SelectFolderGroupComboBoxMainMenu.Items.Add(folder.Name);

            if (FolderGroups.Count > 0) SelectFolderGroupComboBoxMainMenu.SelectedIndex = 0;

            if(Profiles.Count > 1)
            {
                foreach(var profile in Profiles)
                    if(profile.Name != SelectProfileComboBoxMainMenu.Text)
                        CompareAgainstProfileComboBox.Items.Add(profile.Name);

                CompareAgainstProfileComboBox.SelectedIndex = 0;
            }
        }

        private void ClearForm(bool isFolderGroupChange = false)
        {
            DiffViewTreeView.Nodes.Clear();
            if (!isFolderGroupChange)
            {
                CompareAgainstProfileComboBox.Items.Clear();
                CompareAgainstFolderGroupComboBox.Items.Clear();
            }
            CompareButton.Enabled = false;

            ScanSelectedFolderGroupButton.Text = "Scan for Changes";
            MoveNewFilesButton.Enabled = false;
            CommitFilesChangesButton.Enabled = false;
            SelectedGroupFolderViewGroupBox.Text = string.Empty;
            SelectedFolderViewGroupTreeView.Nodes.Clear();
            ComparisionFolderViewGroupBox.Text = string.Empty;
            ComparisionFolderViewTreeView.Nodes.Clear();
        }

        private void ClearDiffResults()
        {
            DiffViewTreeView.Nodes.Clear();
        }

        private void PopulateProfileComboBox()
        {
            var db = new DB();
            Profiles = db.GetProfiles();
            SelectProfileComboBoxMainMenu.Items.Clear();

            foreach(var profile in Profiles)
                SelectProfileComboBoxMainMenu.Items.Add(profile.Name);

            if (Profiles.Count > 0)
            {
                if(Profiles.Count(x => x.MachineName == Environment.MachineName) == 1)
                    SelectProfileComboBoxMainMenu.SelectedIndex = Profiles.FindIndex(x => x.MachineName == Environment.MachineName);
                else 
                    SelectProfileComboBoxMainMenu.SelectedIndex = 0;
            }
        }

        private void RefreshForm()
        {
            ClearForm();

            PopulateProfileComboBox();
        }

        private DB.Profile GetSelectedProfile()
        {
            return Profiles[SelectProfileComboBoxMainMenu.SelectedIndex];
        }

        private DB.FolderGroup GetSelectedFolderGroup()
        {
            return FolderGroups[SelectFolderGroupComboBoxMainMenu.SelectedIndex];
        }

        private DB.Profile GetProfileToCompare()
        {
            return Profiles.First(x => x.Name == CompareAgainstProfileComboBox.Text);
        }

        private DB.FolderGroup GetFolderGroupToCompare()
        {
            return GetProfileToCompare().FolderGroups.First(x => x.Name == CompareAgainstFolderGroupComboBox.Text);
        }

        private void ProfilesManageMainMenu_Click(object sender, EventArgs e)
        {
            var form = new ProfileManager();
            form.ShowDialog();

            RefreshForm();
        }

        private void NamingPatternsManageMainMenu_Click(object sender, EventArgs e)
        {
            var form = new NamingConventionManager();
            form.ShowDialog();
        }

        private void UpdateStatusLabel(string message)
        {
            StatusLabel.Text = message;
            statusStrip1.Refresh();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var form = new FolderBrowserDialog();

            if(form.ShowDialog() == DialogResult.OK)
            {
                textBox1.Text = form.SelectedPath;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //Compare
            
        }
    }
}