using Guna.UI2.WinForms;
using Npgsql;
using System;
using System.Data;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DeanOfficeApp
{
    public partial class UserManagementForm : Form
    {
        private Guna2DataGridView dgvUsers;
        private Guna2TextBox txtUsername, txtPassword, txtFullName;
        private Guna2ComboBox cmbRole;
        private Guna2Button btnAdd, btnUpdate, btnDelete, btnRefresh;
        private Guna2HtmlLabel lblUsername, lblPassword, lblFullName, lblRole;

        private readonly string _connString = "Host=245e1-rw.db.pub.dbaas.postgrespro.ru;Port=5432;Database=dbpractice;Username=mardasov_mv;Password=A4%2x$$2Ynr";

        public UserManagementForm()
        {
            InitializeComponent();
            this.Load += async (s, e) => await LoadUsersAsync();
        }

        // Асинхронная загрузка списка пользователей
        private async Task LoadUsersAsync()
        {
            try
            {
                Cursor = Cursors.WaitCursor;
                string sql = "SELECT user_id, username, role, full_name FROM appuser ORDER BY user_id";
                using (var conn = new NpgsqlConnection(_connString))
                {
                    await conn.OpenAsync();
                    using (var cmd = new NpgsqlCommand(sql, conn))
                    {
                        var dt = new DataTable();
                        dt.Load(await cmd.ExecuteReaderAsync());
                        dgvUsers.DataSource = dt;
                        if (dgvUsers.Columns.Contains("user_id"))
                            dgvUsers.Columns["user_id"].Visible = false;
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Ошибка загрузки пользователей: {ex.Message}");
            }
            finally
            {
                Cursor = Cursors.Default;
            }
        }

        // Хеширование пароля через BCrypt
        private string HashPassword(string password) => BCrypt.Net.BCrypt.HashPassword(password);

        // Добавление нового пользователя
        private async void btnAdd_Click(object sender, EventArgs e)
        {
            string username = txtUsername.Text.Trim();
            string password = txtPassword.Text.Trim();
            string fullName = txtFullName.Text.Trim();
            string role = cmbRole.SelectedItem?.ToString();

            if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(role))
            {
                MessageBox.Show("Заполните логин, пароль и роль.");
                return;
            }

            string hash = HashPassword(password);
            string sql = "INSERT INTO appuser (username, password_hash, role, full_name) VALUES (@u, @p, @r, @f)";

            try
            {
                Cursor = Cursors.WaitCursor;
                using (var conn = new NpgsqlConnection(_connString))
                {
                    await conn.OpenAsync();
                    using (var cmd = new NpgsqlCommand(sql, conn))
                    {
                        cmd.Parameters.AddWithValue("@u", username);
                        cmd.Parameters.AddWithValue("@p", hash);
                        cmd.Parameters.AddWithValue("@r", role);
                        cmd.Parameters.AddWithValue("@f", fullName);
                        await cmd.ExecuteNonQueryAsync();
                    }
                }
                await LoadUsersAsync();
                ClearFields();
                MessageBox.Show("Пользователь добавлен.");
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Ошибка: {ex.Message}");
            }
            finally
            {
                Cursor = Cursors.Default;
            }
        }

        // Обновление данных пользователя
        private async void btnUpdate_Click(object sender, EventArgs e)
        {
            if (dgvUsers.CurrentRow == null)
            {
                MessageBox.Show("Выберите пользователя для обновления.");
                return;
            }
            int userId = (int)dgvUsers.CurrentRow.Cells["user_id"].Value;
            string username = txtUsername.Text.Trim();
            string password = txtPassword.Text.Trim();
            string fullName = txtFullName.Text.Trim();
            string role = cmbRole.SelectedItem?.ToString();

            if (string.IsNullOrEmpty(username) || string.IsNullOrEmpty(role))
            {
                MessageBox.Show("Заполните логин и роль.");
                return;
            }

            try
            {
                Cursor = Cursors.WaitCursor;
                using (var conn = new NpgsqlConnection(_connString))
                {
                    await conn.OpenAsync();
                    NpgsqlCommand cmd;
                    if (!string.IsNullOrEmpty(password))
                    {
                        string hash = HashPassword(password);
                        string sql = "UPDATE appuser SET username=@u, password_hash=@p, role=@r, full_name=@f WHERE user_id=@id";
                        cmd = new NpgsqlCommand(sql, conn);
                        cmd.Parameters.AddWithValue("@p", hash);
                    }
                    else
                    {
                        string sql = "UPDATE appuser SET username=@u, role=@r, full_name=@f WHERE user_id=@id";
                        cmd = new NpgsqlCommand(sql, conn);
                    }
                    cmd.Parameters.AddWithValue("@u", username);
                    cmd.Parameters.AddWithValue("@r", role);
                    cmd.Parameters.AddWithValue("@f", fullName);
                    cmd.Parameters.AddWithValue("@id", userId);
                    await cmd.ExecuteNonQueryAsync();
                }
                await LoadUsersAsync();
                ClearFields();
                MessageBox.Show("Пользователь обновлён.");
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Ошибка: {ex.Message}");
            }
            finally
            {
                Cursor = Cursors.Default;
            }
        }

        // Удаление пользователя
        private async void btnDelete_Click(object sender, EventArgs e)
        {
            if (dgvUsers.CurrentRow == null)
            {
                MessageBox.Show("Выберите пользователя для удаления.");
                return;
            }
            int userId = (int)dgvUsers.CurrentRow.Cells["user_id"].Value;
            if (MessageBox.Show("Удалить пользователя?", "Подтверждение", MessageBoxButtons.YesNo) != DialogResult.Yes)
                return;

            try
            {
                Cursor = Cursors.WaitCursor;
                using (var conn = new NpgsqlConnection(_connString))
                {
                    await conn.OpenAsync();
                    var cmd = new NpgsqlCommand("DELETE FROM appuser WHERE user_id=@id", conn);
                    cmd.Parameters.AddWithValue("@id", userId);
                    await cmd.ExecuteNonQueryAsync();
                }
                await LoadUsersAsync();
                ClearFields();
                MessageBox.Show("Пользователь удалён.");
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Ошибка: {ex.Message}");
            }
            finally
            {
                Cursor = Cursors.Default;
            }
        }

        // Обновить список пользователей
        private async void btnRefresh_Click(object sender, EventArgs e)
        {
            await LoadUsersAsync();
            ClearFields();
        }

        // Заполнение полей при выборе строки в таблице
        private void dgvUsers_SelectionChanged(object sender, EventArgs e)
        {
            if (dgvUsers.CurrentRow != null)
            {
                txtUsername.Text = dgvUsers.CurrentRow.Cells["username"].Value.ToString();
                txtFullName.Text = dgvUsers.CurrentRow.Cells["full_name"].Value?.ToString() ?? "";
                string role = dgvUsers.CurrentRow.Cells["role"].Value.ToString();
                cmbRole.SelectedItem = role;
                txtPassword.Text = ""; // пароль не отображаем
            }
        }

        private void ClearFields()
        {
            txtUsername.Clear();
            txtPassword.Clear();
            txtFullName.Clear();
            cmbRole.SelectedIndex = -1;
        }

        // Пустой обработчик (можно удалить, но оставлен для совместимости)
        private void UserManagementForm_Load(object sender, EventArgs e) { }

        // ==================== ДИЗАЙНЕР ====================
        // Ниже расположен полный код InitializeComponent, сгенерированный конструктором.
        // Он должен быть идентичен вашему существующему, но я привожу его для полноты.
        private void InitializeComponent()
        {
            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle1 = new System.Windows.Forms.DataGridViewCellStyle();
            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle2 = new System.Windows.Forms.DataGridViewCellStyle();
            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle3 = new System.Windows.Forms.DataGridViewCellStyle();
            this.dgvUsers = new Guna.UI2.WinForms.Guna2DataGridView();
            this.txtUsername = new Guna.UI2.WinForms.Guna2TextBox();
            this.txtPassword = new Guna.UI2.WinForms.Guna2TextBox();
            this.txtFullName = new Guna.UI2.WinForms.Guna2TextBox();
            this.cmbRole = new Guna.UI2.WinForms.Guna2ComboBox();
            this.btnAdd = new Guna.UI2.WinForms.Guna2Button();
            this.btnUpdate = new Guna.UI2.WinForms.Guna2Button();
            this.btnDelete = new Guna.UI2.WinForms.Guna2Button();
            this.btnRefresh = new Guna.UI2.WinForms.Guna2Button();
            this.lblUsername = new Guna.UI2.WinForms.Guna2HtmlLabel();
            this.lblPassword = new Guna.UI2.WinForms.Guna2HtmlLabel();
            this.lblFullName = new Guna.UI2.WinForms.Guna2HtmlLabel();
            this.lblRole = new Guna.UI2.WinForms.Guna2HtmlLabel();
            ((System.ComponentModel.ISupportInitialize)(this.dgvUsers)).BeginInit();
            this.SuspendLayout();
            // 
            // dgvUsers
            // 
            this.dgvUsers.AllowUserToAddRows = false;
            this.dgvUsers.AllowUserToDeleteRows = false;
            dataGridViewCellStyle1.BackColor = System.Drawing.Color.White;
            this.dgvUsers.AlternatingRowsDefaultCellStyle = dataGridViewCellStyle1;
            dataGridViewCellStyle2.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
            dataGridViewCellStyle2.BackColor = System.Drawing.Color.FromArgb(100, 88, 255);
            dataGridViewCellStyle2.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, 204);
            dataGridViewCellStyle2.ForeColor = System.Drawing.Color.White;
            dataGridViewCellStyle2.SelectionBackColor = System.Drawing.SystemColors.Highlight;
            dataGridViewCellStyle2.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
            dataGridViewCellStyle2.WrapMode = System.Windows.Forms.DataGridViewTriState.True;
            this.dgvUsers.ColumnHeadersDefaultCellStyle = dataGridViewCellStyle2;
            this.dgvUsers.ColumnHeadersHeight = 40;
            dataGridViewCellStyle3.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
            dataGridViewCellStyle3.BackColor = System.Drawing.Color.White;
            dataGridViewCellStyle3.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, 204);
            dataGridViewCellStyle3.ForeColor = System.Drawing.Color.FromArgb(71, 69, 94);
            dataGridViewCellStyle3.SelectionBackColor = System.Drawing.Color.FromArgb(231, 229, 255);
            dataGridViewCellStyle3.SelectionForeColor = System.Drawing.Color.FromArgb(71, 69, 94);
            dataGridViewCellStyle3.WrapMode = System.Windows.Forms.DataGridViewTriState.False;
            this.dgvUsers.DefaultCellStyle = dataGridViewCellStyle3;
            this.dgvUsers.GridColor = System.Drawing.Color.FromArgb(230, 230, 230);
            this.dgvUsers.Location = new System.Drawing.Point(20, 160);
            this.dgvUsers.Name = "dgvUsers";
            this.dgvUsers.ReadOnly = true;
            this.dgvUsers.RowHeadersVisible = false;
            this.dgvUsers.RowTemplate.Height = 30;
            this.dgvUsers.Size = new System.Drawing.Size(760, 320);
            this.dgvUsers.TabIndex = 0;
            this.dgvUsers.SelectionChanged += new System.EventHandler(this.dgvUsers_SelectionChanged);
            // 
            // txtUsername
            // 
            this.txtUsername.Cursor = System.Windows.Forms.Cursors.IBeam;
            this.txtUsername.DefaultText = "";
            this.txtUsername.Font = new System.Drawing.Font("Segoe UI", 9F);
            this.txtUsername.Location = new System.Drawing.Point(150, 20);
            this.txtUsername.Name = "txtUsername";
            this.txtUsername.PlaceholderText = "Логин";
            this.txtUsername.Size = new System.Drawing.Size(200, 36);
            this.txtUsername.TabIndex = 1;
            // 
            // txtPassword
            // 
            this.txtPassword.Cursor = System.Windows.Forms.Cursors.IBeam;
            this.txtPassword.DefaultText = "";
            this.txtPassword.Font = new System.Drawing.Font("Segoe UI", 9F);
            this.txtPassword.Location = new System.Drawing.Point(150, 70);
            this.txtPassword.Name = "txtPassword";
            this.txtPassword.PlaceholderText = "Пароль (оставьте пустым, чтобы не менять)";
            this.txtPassword.Size = new System.Drawing.Size(200, 36);
            this.txtPassword.TabIndex = 2;
            // 
            // txtFullName
            // 
            this.txtFullName.Cursor = System.Windows.Forms.Cursors.IBeam;
            this.txtFullName.DefaultText = "";
            this.txtFullName.Font = new System.Drawing.Font("Segoe UI", 9F);
            this.txtFullName.Location = new System.Drawing.Point(150, 120);
            this.txtFullName.Name = "txtFullName";
            this.txtFullName.PlaceholderText = "Полное имя";
            this.txtFullName.Size = new System.Drawing.Size(200, 36);
            this.txtFullName.TabIndex = 3;
            // 
            // cmbRole
            // 
            this.cmbRole.BackColor = System.Drawing.Color.Transparent;
            this.cmbRole.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed;
            this.cmbRole.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.cmbRole.Font = new System.Drawing.Font("Segoe UI", 10F);
            this.cmbRole.ForeColor = System.Drawing.Color.FromArgb(68, 88, 112);
            this.cmbRole.ItemHeight = 30;
            this.cmbRole.Items.AddRange(new object[] { "admin", "manager", "teacher", "student" });
            this.cmbRole.Location = new System.Drawing.Point(150, 170);
            this.cmbRole.Name = "cmbRole";
            this.cmbRole.Size = new System.Drawing.Size(200, 36);
            this.cmbRole.TabIndex = 4;
            // 
            // btnAdd
            // 
            this.btnAdd.BorderRadius = 8;
            this.btnAdd.FillColor = System.Drawing.Color.FromArgb(40, 167, 69);
            this.btnAdd.Font = new System.Drawing.Font("Segoe UI", 9F);
            this.btnAdd.ForeColor = System.Drawing.Color.White;
            this.btnAdd.Location = new System.Drawing.Point(400, 20);
            this.btnAdd.Name = "btnAdd";
            this.btnAdd.Size = new System.Drawing.Size(100, 36);
            this.btnAdd.TabIndex = 5;
            this.btnAdd.Text = "Добавить";
            this.btnAdd.Click += new System.EventHandler(this.btnAdd_Click);
            // 
            // btnUpdate
            // 
            this.btnUpdate.BorderRadius = 8;
            this.btnUpdate.FillColor = System.Drawing.Color.FromArgb(255, 193, 7);
            this.btnUpdate.Font = new System.Drawing.Font("Segoe UI", 9F);
            this.btnUpdate.ForeColor = System.Drawing.Color.Black;
            this.btnUpdate.Location = new System.Drawing.Point(520, 20);
            this.btnUpdate.Name = "btnUpdate";
            this.btnUpdate.Size = new System.Drawing.Size(100, 36);
            this.btnUpdate.TabIndex = 6;
            this.btnUpdate.Text = "Обновить";
            this.btnUpdate.Click += new System.EventHandler(this.btnUpdate_Click);
            // 
            // btnDelete
            // 
            this.btnDelete.BorderRadius = 8;
            this.btnDelete.FillColor = System.Drawing.Color.FromArgb(220, 53, 69);
            this.btnDelete.Font = new System.Drawing.Font("Segoe UI", 9F);
            this.btnDelete.ForeColor = System.Drawing.Color.White;
            this.btnDelete.Location = new System.Drawing.Point(640, 20);
            this.btnDelete.Name = "btnDelete";
            this.btnDelete.Size = new System.Drawing.Size(100, 36);
            this.btnDelete.TabIndex = 7;
            this.btnDelete.Text = "Удалить";
            this.btnDelete.Click += new System.EventHandler(this.btnDelete_Click);
            // 
            // btnRefresh
            // 
            this.btnRefresh.BorderRadius = 8;
            this.btnRefresh.FillColor = System.Drawing.Color.FromArgb(52, 73, 94);
            this.btnRefresh.Font = new System.Drawing.Font("Segoe UI", 9F);
            this.btnRefresh.ForeColor = System.Drawing.Color.White;
            this.btnRefresh.Location = new System.Drawing.Point(400, 70);
            this.btnRefresh.Name = "btnRefresh";
            this.btnRefresh.Size = new System.Drawing.Size(100, 36);
            this.btnRefresh.TabIndex = 8;
            this.btnRefresh.Text = "Обновить список";
            this.btnRefresh.Click += new System.EventHandler(this.btnRefresh_Click);
            // 
            // lblUsername
            // 
            this.lblUsername.BackColor = System.Drawing.Color.Transparent;
            this.lblUsername.Location = new System.Drawing.Point(20, 32);
            this.lblUsername.Name = "lblUsername";
            this.lblUsername.Size = new System.Drawing.Size(37, 15);
            this.lblUsername.TabIndex = 9;
            this.lblUsername.Text = "Логин:";
            // 
            // lblPassword
            // 
            this.lblPassword.BackColor = System.Drawing.Color.Transparent;
            this.lblPassword.Location = new System.Drawing.Point(20, 82);
            this.lblPassword.Name = "lblPassword";
            this.lblPassword.Size = new System.Drawing.Size(44, 15);
            this.lblPassword.TabIndex = 10;
            this.lblPassword.Text = "Пароль:";
            // 
            // lblFullName
            // 
            this.lblFullName.BackColor = System.Drawing.Color.Transparent;
            this.lblFullName.Location = new System.Drawing.Point(20, 132);
            this.lblFullName.Name = "lblFullName";
            this.lblFullName.Size = new System.Drawing.Size(33, 15);
            this.lblFullName.TabIndex = 11;
            this.lblFullName.Text = "ФИО:";
            // 
            // lblRole
            // 
            this.lblRole.BackColor = System.Drawing.Color.Transparent;
            this.lblRole.Location = new System.Drawing.Point(20, 182);
            this.lblRole.Name = "lblRole";
            this.lblRole.Size = new System.Drawing.Size(31, 15);
            this.lblRole.TabIndex = 12;
            this.lblRole.Text = "Роль:";
            // 
            // UserManagementForm
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.BackColor = System.Drawing.Color.FromArgb(240, 242, 245);
            this.ClientSize = new System.Drawing.Size(800, 500);
            this.Controls.Add(this.dgvUsers);
            this.Controls.Add(this.txtUsername);
            this.Controls.Add(this.txtPassword);
            this.Controls.Add(this.txtFullName);
            this.Controls.Add(this.cmbRole);
            this.Controls.Add(this.btnAdd);
            this.Controls.Add(this.btnUpdate);
            this.Controls.Add(this.btnDelete);
            this.Controls.Add(this.btnRefresh);
            this.Controls.Add(this.lblUsername);
            this.Controls.Add(this.lblPassword);
            this.Controls.Add(this.lblFullName);
            this.Controls.Add(this.lblRole);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.Name = "UserManagementForm";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
            this.Text = "Управление пользователями";
            this.Load += new System.EventHandler(this.UserManagementForm_Load);
            ((System.ComponentModel.ISupportInitialize)(this.dgvUsers)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();
        }
    }
}