using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using MetroFramework;
using MetroFramework.Forms;

namespace Учет_вещей
{
    public partial class Form1 : MetroForm
    {
        private User _currentUser;
        private Device _selectedDevice;

        public Form1()
        {
            InitializeComponent();
            this.Theme = MetroFramework.MetroThemeStyle.Light;
            this.Style = MetroFramework.MetroColorStyle.Blue;
            this.BorderStyle = MetroFormBorderStyle.FixedSingle;
            this.ShadowType = MetroFormShadowType.AeroShadow;

            this.Text = "Учет оборудования";
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Показываем форму логина
            using (var loginForm = new LoginForm())
            {
                if (loginForm.ShowDialog() == DialogResult.OK)
                {
                    _currentUser = loginForm.CurrentUser;
                    ConfigureFormForUser();
                    RefreshDevicesGrid();
                }
                else
                {
                    Close(); // Выход, если пользователь отменил вход
                }
            }

            // Настройка ComboBox для типов устройств и состояний
            cmbFilterType.Items.Add("Все типы");
            foreach (DeviceType type in Enum.GetValues(typeof(DeviceType)))
            {
                cmbFilterType.Items.Add(type.ToString());
                cmbDeviceType.Items.Add(type.ToString());
            }
            cmbFilterType.SelectedIndex = 0;

            cmbFilterState.Items.Add("Все состояния");
            foreach (DeviceState state in Enum.GetValues(typeof(DeviceState)))
            {
                cmbFilterState.Items.Add(state.ToString());
                cmbDeviceState.Items.Add(state.ToString());
            }
            cmbFilterState.SelectedIndex = 0;

            // Текущая дата для нового устройства
            dtpRegistrationDate.Value = DateTime.Today;

            // Обработчик выбора строки в DataGridView
            dgvDevices.SelectionChanged += DgvDevices_SelectionChanged;
        }

        private void ConfigureFormForUser()
        {
            Text = $"Учёт техники в организации - {_currentUser.Username} ({_currentUser.Role})";

            bool isAdmin = _currentUser.Role == UserRole.Admin;
            btnAdd.Enabled = isAdmin;
            btnEdit.Enabled = isAdmin;
            btnDelete.Enabled = isAdmin;
            btnSave.Enabled = isAdmin;
            panelDeviceDetails.Enabled = isAdmin;
        }

        private void RefreshDevicesGrid(List<Device> devices = null)
        {
            devices = devices ?? DbManager.GetAllDevices();

            dgvDevices.DataSource = null;
            dgvDevices.DataSource = devices;

            // Настройка столбцов
            if (dgvDevices.Columns.Count > 0)
            {
                dgvDevices.Columns["Id"].HeaderText = "ID";
                dgvDevices.Columns["Id"].Width = 40;
                dgvDevices.Columns["Name"].HeaderText = "Наименование";
                dgvDevices.Columns["Name"].Width = 150;
                dgvDevices.Columns["InventoryNumber"].HeaderText = "Инв. номер";
                dgvDevices.Columns["InventoryNumber"].Width = 80;
                dgvDevices.Columns["TypeString"].HeaderText = "Тип";
                dgvDevices.Columns["Type"].Visible = false;
                dgvDevices.Columns["Location"].HeaderText = "Местоположение";
                dgvDevices.Columns["ResponsiblePerson"].HeaderText = "Отв. лицо";
                dgvDevices.Columns["StateString"].HeaderText = "Состояние";
                dgvDevices.Columns["State"].Visible = false;
                dgvDevices.Columns["RegistrationDate"].HeaderText = "Дата регистрации";
                dgvDevices.Columns["RegistrationDate"].DefaultCellStyle.Format = "dd.MM.yyyy";
            }

            // Обновляем статистику
            UpdateStatistics();
        }

        private void UpdateStatistics()
        {
            Dictionary<DeviceType, int> stats = DbManager.GetDeviceTypeStats();
            lvStatistics.Items.Clear();

            foreach (var item in stats)
            {
                ListViewItem lvi = new ListViewItem(item.Key.ToString());
                lvi.SubItems.Add(item.Value.ToString());
                lvStatistics.Items.Add(lvi);
            }

            // Общее количество устройств
            int totalDevices = stats.Values.Sum();
            ListViewItem totalItem = new ListViewItem("ВСЕГО");
            totalItem.SubItems.Add(totalDevices.ToString());
            totalItem.Font = new Font(lvStatistics.Font, FontStyle.Bold);
            lvStatistics.Items.Add(totalItem);
        }

        private void ClearDeviceForm()
        {
            txtDeviceName.Text = "";
            txtInventoryNumber.Text = "";
            txtLocation.Text = "";
            txtResponsiblePerson.Text = "";
            cmbDeviceType.SelectedIndex = -1;
            cmbDeviceState.SelectedIndex = -1;
            dtpRegistrationDate.Value = DateTime.Today;
            _selectedDevice = null;
        }

        private void FillDeviceForm(Device device)
        {
            if (device == null) return;

            txtDeviceName.Text = device.Name;
            txtInventoryNumber.Text = device.InventoryNumber;
            txtLocation.Text = device.Location;
            txtResponsiblePerson.Text = device.ResponsiblePerson;
            cmbDeviceType.SelectedItem = device.Type.ToString();
            cmbDeviceState.SelectedItem = device.State.ToString();
            dtpRegistrationDate.Value = device.RegistrationDate;
            _selectedDevice = device;
        }

        private Device GetDeviceFromForm()
        {
            if (string.IsNullOrEmpty(txtDeviceName.Text) ||
                string.IsNullOrEmpty(txtInventoryNumber.Text) ||
                cmbDeviceType.SelectedIndex == -1 ||
                cmbDeviceState.SelectedIndex == -1)
            {
                MetroMessageBox.Show(this,
                    "Пожалуйста, заполните все обязательные поля",
                    "Ошибка",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Warning);
                return null;
            }

            Device device = new Device
            {
                Name = txtDeviceName.Text,
                InventoryNumber = txtInventoryNumber.Text,
                Type = (DeviceType)Enum.Parse(typeof(DeviceType), cmbDeviceType.SelectedItem.ToString()),
                Location = txtLocation.Text,
                ResponsiblePerson = txtResponsiblePerson.Text,
                State = (DeviceState)Enum.Parse(typeof(DeviceState), cmbDeviceState.SelectedItem.ToString()),
                RegistrationDate = dtpRegistrationDate.Value
            };

            if (_selectedDevice != null)
                device.Id = _selectedDevice.Id;

            return device;
        }

        private void DgvDevices_SelectionChanged(object sender, EventArgs e)
        {
            if (dgvDevices.SelectedRows.Count > 0 && dgvDevices.SelectedRows[0].DataBoundItem is Device selectedDevice)
            {
                FillDeviceForm(selectedDevice);
            }
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            ClearDeviceForm();
        }

        private void btnEdit_Click(object sender, EventArgs e)
        {
            if (dgvDevices.SelectedRows.Count == 0)
            {
                MetroMessageBox.Show(this,
                    "Выберите устройство для редактирования",
                    "Информация",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Information);
                return;
            }

            if (dgvDevices.SelectedRows[0].DataBoundItem is Device selectedDevice)
            {
                FillDeviceForm(selectedDevice);
            }
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            if (dgvDevices.SelectedRows.Count == 0)
            {
                MetroMessageBox.Show(this,
                    "Выберите устройство для удаления",
                    "Информация",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Information);
                return;
            }

            if (dgvDevices.SelectedRows[0].DataBoundItem is Device selectedDevice)
            {
                if (MetroMessageBox.Show(this,
                    $"Вы действительно хотите удалить устройство \"{selectedDevice.Name}\"?",
                    "Подтверждение удаления",
                    MessageBoxButtons.YesNo,
                    MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    DbManager.DeleteDevice(selectedDevice.Id);
                    RefreshDevicesGrid();
                    ClearDeviceForm();
                }
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            Device device = GetDeviceFromForm();
            if (device == null) return;

            if (_selectedDevice == null)
            {
                // Добавление нового устройства
                DbManager.AddDevice(device);
            }
            else
            {
                // Обновление существующего устройства
                DbManager.UpdateDevice(device);
            }

            RefreshDevicesGrid();
            ClearDeviceForm();
        }

        private void btnFilter_Click(object sender, EventArgs e)
        {
            DeviceType? filterType = null;
            if (cmbFilterType.SelectedIndex > 0)
            {
                filterType = (DeviceType)Enum.Parse(typeof(DeviceType), cmbFilterType.SelectedItem.ToString());
            }

            DeviceState? filterState = null;
            if (cmbFilterState.SelectedIndex > 0)
            {
                filterState = (DeviceState)Enum.Parse(typeof(DeviceState), cmbFilterState.SelectedItem.ToString());
            }

            string location = txtFilterLocation.Text;
            string searchText = txtSearch.Text;

            var filteredDevices = DbManager.FilterDevices(filterType, filterState, location, searchText);
            RefreshDevicesGrid(filteredDevices);
        }

        private void btnResetFilter_Click(object sender, EventArgs e)
        {
            cmbFilterType.SelectedIndex = 0;
            cmbFilterState.SelectedIndex = 0;
            txtFilterLocation.Text = "";
            txtSearch.Text = "";
            RefreshDevicesGrid();
        }

        private void btnExport_Click(object sender, EventArgs e)
        {
            try
            {
                SaveFileDialog saveDialog = new SaveFileDialog
                {
                    Filter = "CSV файлы (*.csv)|*.csv|Текстовые файлы (*.txt)|*.txt|Все файлы (*.*)|*.*",
                    Title = "Экспорт данных",
                    FileName = "Учет_техники_" + DateTime.Now.ToString("dd_MM_yyyy")
                };

                if (saveDialog.ShowDialog() == DialogResult.OK)
                {
                    DbManager.ExportToCsv(saveDialog.FileName);
                    MetroMessageBox.Show(this,
                        "Данные успешно экспортированы",
                        "Экспорт",
                        MessageBoxButtons.OK,
                        MessageBoxIcon.Information);
                }
            }
            catch (Exception ex)
            {
                MetroMessageBox.Show(this,
                    "Ошибка при экспорте данных: " + ex.Message,
                    "Ошибка",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Error);
            }
        }
    }
}