using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
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; }

        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;

            PopulateProfileComboBox();
        }

        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);
        }

        private void CommitFirstTimeScaneToDatabase(Snapshot snapshot)
        {
            var db = new DB();
            db.InsertNewFileRecord(snapshot.Files.Values.ToList(), GetSelectedProfile().Id, GetSelectedFolderGroup().Id, GetSelectedFolderGroup().Path);
        }

        private void CompareButton_Click(object sender, EventArgs e)
        {
            var db = new DB();
            var p = GetProfileToCompare();
            var f = GetFolderGroupToCompare();

        }

        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;
        }

        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).";
        }

        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;
        }

        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();
        }
    }
}