using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Diplom_O.DataBase;

namespace Diplom_O
{
	public partial class LearnForm : Form
	{
		private readonly ColumnConf[] tableMainColumns = {
			new ColumnConf(name: "№"),
			new ColumnConf(name: "Название обр. учр.", size: 140, warp: true),
			new ColumnConf(name: "Уровень", size: 140),
			new ColumnConf(name: "Специальность", size: 140),
			new ColumnConf(name: "Дата окончания", size: 80),
			new ColumnConf(name: "Курсы", size: 140, warp: true),
			new ColumnConf(name: "Проф. переподготовка", size: 140, warp: true)
		};

		private Rabotnik rabotnik = null;
		private void linkRabLabel_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
		{
			var form = new RabForm(true);
			form.ShowDialog();
			if (form.isCanceled)
				rabotnik = null;
			else
				rabotnik = form.formResult;
			ResetLinkRabotnik();
			resetLearnTable();
		}
		private void ResetLinkRabotnik()
    {
			if (rabotnik == null)
			{
				linkRabLabel.Text = "Выбрать сотрудника...";
				return;
			}
			var chel = FuncDB.ChelGetById(rabotnik.ChelId);
			if (chel == null)
			{
				linkRabLabel.Text = "Выбрать сотрудника...";
				return;
			}
			var res = chel.FName.ToString() + " " +
							chel.SName[0].ToString() + "." +
								((!string.IsNullOrEmpty(chel.TName)) ?
									chel.TName[0].ToString() + "." : "");
			linkRabLabel.Text = res;
		}

		private void resetLearnTable()
		{
			try
			{
				var res = rabotnik == null ? Array.Empty<string[]>() : FuncDB.LearnListTableMain(rabotnik.ChelId);
				this.ResetTable(
					learnGridView,
					tableMainColumns,
					res
				);
			}
			catch (Exception e)
			{
				this.ShowError(errorLabel, e.Message);
			}
		}
		private Learn selectedLearnTable()
		{
			try
			{
				if (learnGridView.SelectedRows.Count != 1)
					throw new Exception("Образование не выбрано.");
				if (int.TryParse((string)learnGridView.SelectedRows[0].Cells[0].Value, out int value))
					return FuncDB.LearnGetById(value);
				else
					throw new Exception("Ошибка в таблице.");
			}
			catch (Exception e)
			{
				this.ShowError(errorLabel, e.Message);
				return null;
			}
		}

		public LearnForm()
		{
			InitializeComponent();
			this.correctUpperMenu(menuStrip, 4);
			ResetLinkRabotnik(); 
			resetLearnTable();
			
			linkRabLabel.Enabled =
				addButton.Enabled =
				changeButton.Enabled =
				delButton.Enabled = false;
			
			var user = this.GetUser();
			if (user == null)
				return;
			linkRabLabel.Enabled = FuncDB.AccessGetByUserIdFormIdAccessId(user.Id, 4, 0) != null;
			delButton.Enabled = FuncDB.AccessGetByUserIdFormIdAccessId(user.Id, 4, 1) != null;
			changeButton.Enabled = FuncDB.AccessGetByUserIdFormIdAccessId(user.Id, 4, 2) != null;
			addButton.Enabled = FuncDB.AccessGetByUserIdFormIdAccessId(user.Id, 4, 3) != null;
		}

		private void addButton_Click(object sender, EventArgs e)
		{
			try
			{
				if (rabotnik == null)
					throw new Exception("Не выбран сотрудник.");
				var form = new SupportForms.LearnForm(chelId: rabotnik.ChelId);
				form.ShowDialog();
				if (!form.isCanceled)
				{
					resetLearnTable();
				}
			}
			catch (Exception ex)
			{
				this.ShowError(errorLabel, ex.Message);
			}
		}
		private void changeButton_Click(object sender, EventArgs e)
		{
			try
			{
				var form = new SupportForms.LearnForm(selectedLearnTable());
				form.ShowDialog();
				if (!form.isCanceled)
					resetLearnTable();
			}
			catch (Exception ex)
			{
				this.ShowError(errorLabel, ex.Message);
			}
		}
		private void delButton_Click(object sender, EventArgs e)
		{
			try
			{
				FuncDB.LearnDelete(selectedLearnTable());
				resetLearnTable();
			}
			catch (Exception ex)
			{
				this.ShowError(errorLabel, ex.Message);
			}
		}

		private void upperMenuClicked(object sender, ToolStripItemClickedEventArgs e)
		{
			this.upperMenuClicked((MenuStrip)sender);
			if (this.GetNextForm() != -1)
				Close();
		}
  }
}