using System;
using System.Data;
using System.Windows.Forms;
using Npgsql;

namespace PhotoStudioApp
{
    public partial class ClientForm : Form
    {
        private string _connectionString;

        public ClientForm(string connectionString)
        {
            InitializeComponent();
            _connectionString = connectionString;
            LoadClients();
        }

        private void LoadClients()
        {
            using (NpgsqlConnection conn = new NpgsqlConnection(_connectionString))
            {
                conn.Open();
                string sql = "select client_id, last_name, first_name, middle_name, phone from clients";
                NpgsqlDataAdapter adapter = new NpgsqlDataAdapter(sql, conn);
                DataTable dt = new DataTable();
                adapter.Fill(dt);

                dgvClients.DataSource = dt;
                if (dgvClients.Columns.Contains("client_id"))
                {
                    dgvClients.Columns["client_id"].Visible = false;
                }
            }
        }

        private string GetSHA256Hash(string input)
        {
            using (System.Security.Cryptography.SHA256 sha256 = System.Security.Cryptography.SHA256.Create())
            {
                byte[] inputBytes = System.Text.Encoding.UTF8.GetBytes(input);
                byte[] hashBytes = sha256.ComputeHash(inputBytes);
                return BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
            }
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            string lastName = Microsoft.VisualBasic.Interaction.InputBox("Введите фамилию", "Добавление клиента");
            if (!string.IsNullOrEmpty(lastName))
            {
                string firstName = Microsoft.VisualBasic.Interaction.InputBox("Введите имя", "Добавление клиента");
                string middleName = Microsoft.VisualBasic.Interaction.InputBox("Введите отчество (необязательно)", "Добавление клиента");
                string phone = Microsoft.VisualBasic.Interaction.InputBox("Введите телефон", "Добавление клиента");

                using (NpgsqlConnection conn = new NpgsqlConnection(_connectionString))
                {
                    conn.Open();

                    // 1. Создаём пользователя
                    string login = lastName.ToLower() + "_" + firstName.ToLower();
                    string passwordHash = GetSHA256Hash("123"); // пароль по умолчанию

                    string userSql = "insert into users (login, password_hash, role_id) values (@login, @hash, 2) returning user_id";
                    NpgsqlCommand userCmd = new NpgsqlCommand(userSql, conn);
                    userCmd.Parameters.AddWithValue("@login", login);
                    userCmd.Parameters.AddWithValue("@hash", passwordHash);

                    int userId = Convert.ToInt32(userCmd.ExecuteScalar());

                    // 2. Создаём клиента с полученным user_id
                    string clientSql = "insert into clients (user_id, last_name, first_name, middle_name, phone) values (@userId, @lastName, @firstName, @middleName, @phone)";
                    NpgsqlCommand clientCmd = new NpgsqlCommand(clientSql, conn);
                    clientCmd.Parameters.AddWithValue("@userId", userId);
                    clientCmd.Parameters.AddWithValue("@lastName", lastName);
                    clientCmd.Parameters.AddWithValue("@firstName", firstName);
                    clientCmd.Parameters.AddWithValue("@middleName", middleName);
                    clientCmd.Parameters.AddWithValue("@phone", phone);
                    clientCmd.ExecuteNonQuery();

                    MessageBox.Show($"Клиент добавлен! Логин: {login}, пароль: 123");
                    LoadClients();
                }
            }
        }

        private void btnEdit_Click(object sender, EventArgs e)
        {
            if (dgvClients.SelectedRows.Count > 0)
            {
                DataRowView rowView = dgvClients.SelectedRows[0].DataBoundItem as DataRowView;
                if (rowView != null)
                {
                    int clientId = (int)rowView["client_id"];
                    string currentLastName = rowView["last_name"].ToString();
                    string currentFirstName = rowView["first_name"].ToString();
                    string currentMiddleName = rowView["middle_name"].ToString();
                    string currentPhone = rowView["phone"].ToString();

                    string lastName = Microsoft.VisualBasic.Interaction.InputBox("Фамилия", "Редактирование", currentLastName);
                    string firstName = Microsoft.VisualBasic.Interaction.InputBox("Имя", "Редактирование", currentFirstName);
                    string middleName = Microsoft.VisualBasic.Interaction.InputBox("Отчество", "Редактирование", currentMiddleName);
                    string phone = Microsoft.VisualBasic.Interaction.InputBox("Телефон", "Редактирование", currentPhone);

                    using (NpgsqlConnection conn = new NpgsqlConnection(_connectionString))
                    {
                        conn.Open();
                        string sql = "update clients set last_name = @lastName, first_name = @firstName, middle_name = @middleName, phone = @phone where client_id = @clientId";
                        NpgsqlCommand cmd = new NpgsqlCommand(sql, conn);
                        cmd.Parameters.AddWithValue("@lastName", lastName);
                        cmd.Parameters.AddWithValue("@firstName", firstName);
                        cmd.Parameters.AddWithValue("@middleName", middleName);
                        cmd.Parameters.AddWithValue("@phone", phone);
                        cmd.Parameters.AddWithValue("@clientId", clientId);
                        cmd.ExecuteNonQuery();
                        MessageBox.Show("Клиент обновлён");
                        LoadClients();
                    }
                }
            }
            else
            {
                MessageBox.Show("Выберите клиента для редактирования");
            }
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            if (dgvClients.SelectedRows.Count > 0)
            {
                DataRowView rowView = dgvClients.SelectedRows[0].DataBoundItem as DataRowView;
                if (rowView != null)
                {
                    int clientId = (int)rowView["client_id"];
                    if (MessageBox.Show("Удалить клиента?", "Подтверждение", MessageBoxButtons.YesNo) == DialogResult.Yes)
                    {
                        using (NpgsqlConnection conn = new NpgsqlConnection(_connectionString))
                        {
                            conn.Open();
                            // Сначала удаляем клиента
                            string sql = "delete from clients where client_id = @clientId";
                            NpgsqlCommand cmd = new NpgsqlCommand(sql, conn);
                            cmd.Parameters.AddWithValue("@clientId", clientId);
                            cmd.ExecuteNonQuery();
                            MessageBox.Show("Клиент удалён");
                            LoadClients();
                        }
                    }
                }
            }
            else
            {
                MessageBox.Show("Выберите клиента для удаления");
            }
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}