using DbTools;
using System.Data.SQLite;
using System.IO;
using System.Windows.Forms;

namespace DbToolsTester.Forms {
    public partial class MainForm : DevExpress.XtraEditors.XtraForm {
        public static MainForm Instance { get; private set; }
        public string DatabaseName { get; set; }
        public string Database1File { get; set; }
        public string Database2File { get; set; }

        public MainForm() {
            InitializeComponent();
            Instance = this;
        }

        private void XtraTabControl1_CustomHeaderButtonClick(object sender, DevExpress.XtraTab.ViewInfo.CustomHeaderButtonEventArgs e) {
            string tag = e.Button.Tag?.ToString();
            if (tag == "open") {
                OpenForm frm = new OpenForm();
                if (frm.ShowDialog(this) == DialogResult.OK) {
                    // Databases are set in OpenForm
                    SetDatabases(frm.Db1Path, frm.Db2Path);
                }
            } else if (tag == "clear") {
                Database1File = null;
                Database2File = null;

                db1Sql.Clear();
                db2Sql.Clear();
                deltaSql.Clear();

                Text = "DbSync Tester";
            }
        }

        public void SetDatabases(string db1File, string db2File) {
            Database1File = db1File;
            Database2File = db2File;
            DatabaseName = Path.GetFileNameWithoutExtension(Database1File);
            Text += " [ Production DB = " + Path.GetFileName(Database1File) + "; Schema DB = " + Path.GetFileName(Database2File) + " ]";
        }

        private string getDatabaseFile(string title = "Select Database File...") {
            OpenFileDialog dlg = new OpenFileDialog() {
                Filter = "Database Files (*.sql;*.sqlite;*.db)|*.sql;*.sqlite;*.db|SQL Files (*.sql)|*.sql|Sqlite Files (*.sqlite;*.db)|*.sqlite;*.db|Text Files (*.txt)|*.txt|All Files (*.*)|*.*",
                CheckFileExists = true,
                Multiselect = false,
                Title = title
            };
            if (dlg.ShowDialog() == DialogResult.OK) {
                return dlg.FileName;
            }
            return null;
        }

        private async void ToolbarItemClicked(object sender, DevExpress.XtraBars.ItemClickEventArgs e) {
            if (e.Item.Equals(bbiDelta)) {
                deltaSql.Clear();

                SQLiteConnection db1 = new SQLiteConnection("Data Source=" + Database1File + ";Version=3;");
                SQLiteConnection db2 = new SQLiteConnection("Data Source=" + Database2File + ";Version=3;");

                SqlBuilder builder = new SqlBuilder();
                string[] missingTables = builder.GetMissingTables(db1, db2);
                foreach (string table in missingTables) {
                    string sql = await builder.GetTableCreateSqlAsync(db2, table);
                    deltaSql.AppendText(sql + "\r\n");
                }

                //Delta delta = new Delta();
                //deltaSql.Text = delta.BuildDelta(db1, db2, btsRemoveUnusedTables.Checked, btsRemoveUnusedColumns.Checked);
                //db1Sql.Text = delta.Db1Sql;
                //db2Sql.Text = delta.Db2Sql;
            } else if (e.Item.Equals(bbiApplyBoth)) {
                if (string.IsNullOrEmpty(deltaSql.Text)) {
                    MessageBox.Show("No delta SQL to apply.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }

                using (var db1 = new SQLiteConnection("Data Source=" + Database1File + ";Version=3;")) {
                    db1.Open();
                    Delta delta = new Delta();
                    bool success = delta.ApplyDelta(db1, deltaSql.Text);
                    if (success) {
                        MessageBox.Show("Delta applied successfully.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    } else {
                        MessageBox.Show("Failed to apply delta." + (delta.LastError != null ? "\r\n\r\n" + delta.LastError.Message : ""), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            } else if (e.Item.Equals(bbiBuildTableCreate)) {
                TableChooserForm frm = new TableChooserForm();
                if (frm.ShowDialog(this) == DialogResult.OK) {
                    using (var cn = new SQLiteConnection("Data Source=" + (frm.SelectedDatabase == Path.GetFileName(Database1File) ? Database1File : Database2File) + ";Version=3;")) {
                        SqlBuilder builder = new SqlBuilder();
                        string sql = await builder.GetTableCreateSqlAsync(cn, frm.SelectedTable);
                        if (!string.IsNullOrEmpty(sql)) {
                            deltaSql.Text = sql;
                        } else {
                            MessageBox.Show("Failed to get CREATE TABLE SQL for table " + frm.SelectedTable, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        }
                    }
                }
            }
        }
    }
}