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_B.DB;

namespace Diplom_B
{
  public partial class StatForm : Form
  {
    public StatForm()
    {
      InitializeComponent();
			Init();
			UpdateTable(WorkDB.ListStatus());
		}

		private void Init()
		{
			if (Program.user == null) this.Close();
			{
				deleteButton.Enabled = Program.user.Usr.Set > 2;
				createButton.Enabled = Program.user.Usr.Set > 2;
				changeButton.Enabled = Program.user.Usr.Set > 1;
			}
		}

		private void UpdateTable(Status[] arr, bool reset_cursor = false)
		{
			var selected = (!reset_cursor && statGridView.SelectedRows.Count > 0) ? statGridView.SelectedRows[0].Index : -1;
			{
				var r = statGridView.Rows;
				while (r.Count > 0)
					r.Remove(r[0]);
				var c = statGridView.Columns;
				while (c.Count > 0)
					c.Remove(c[0]);
			}
			{
				var c = statGridView.Columns;
				c.Add("Id", "№");
				c["Id"].Width = 40;
				c.Add("Name", "Наим.");
				c["Name"].Width = 100;
			}
			{
				var r = statGridView.Rows;
				foreach (var stat in arr)
					r.Add(new object[] {
						stat.Id,
						stat.Stat,
					});
			}
			if (statGridView.Rows.Count > 0)
				statGridView.Rows[0].Selected = true;
			if (selected != -1 && selected < statGridView.Rows.Count)
				for (var i = 0; i < statGridView.Rows.Count; i++)
					statGridView.Rows[i].Selected = (i == selected);
			statGridView_CurrentCellChanged(this, new EventArgs());
		}

		private Task errDrop;
		private void ShowError(string msg = null)
		{
			errorLable.Text = string.IsNullOrEmpty(msg) ? "Неизвестная ошибка." : msg;
			errorLable.Visible = true;
			errDrop = new Task(() =>
			{
				var fd = errDrop.Id;
				Task.Delay(5000).Wait();
				if (errDrop.Id == fd)
					if (InvokeRequired) Invoke((Action)(() => { errorLable.Visible = false; }));
					else errorLable.Visible = false;
			});
			errDrop.Start();
		}

		private void statGridView_CurrentCellChanged(object sender, EventArgs e)
		{
			if (statGridView.SelectedRows.Count != 1)
				return;
			{
				var stat = WorkDB.GetStatus((int)statGridView.SelectedRows[0].Cells[0].Value);
				if (stat == null)
					return;
				nameBox.Text = stat.Stat;
			}
		}

		private void createButton_Click(object sender, EventArgs e)
		{
			if (string.IsNullOrEmpty(nameBox.Text)) { ShowError("Статус пустой."); return; }
			if (WorkDB.GetStatusList().Contains(nameBox.Text)) { ShowError("Статус существует."); return; }

			try
			{
				var r = new Status() { Stat = nameBox.Text };
				WorkDB.AddStatus(r);
				UpdateTable(WorkDB.ListStatus());
			}
			catch { ShowError(); }
		}
		private void changeButton_Click(object sender, EventArgs e)
		{
			try
			{
				if (statGridView.SelectedRows.Count != 1) { ShowError("Статус не выбран."); return; }
				if (string.IsNullOrEmpty(nameBox.Text)) { ShowError("Название пустое."); return; }
				var stat = WorkDB.GetStatus((int)statGridView.SelectedRows[0].Cells[0].Value);
				if (stat.Stat != nameBox.Text && WorkDB.GetStatusList().Contains(nameBox.Text)) { ShowError("Статус существует."); return; }
				stat.Stat = nameBox.Text;
				WorkDB.ChangeStatus(stat);
				UpdateTable(WorkDB.ListStatus());
			}
			catch { ShowError(); }
		}
		private void deleteButton_Click(object sender, EventArgs e)
		{
			if (statGridView.SelectedRows.Count != 1) { ShowError("Статус не выбран."); return; }
			if (WorkDB.ListStatus().Length <= 1) { ShowError("Нельзя удалить."); return; }
			if (WorkDB.GetPostavkyFromStatus((int)statGridView.SelectedRows[0].Cells[0].Value).Length > 0) { ShowError("Есть связи с поставками."); return; }
			var stat = WorkDB.GetStatus((int)statGridView.SelectedRows[0].Cells[0].Value);
			if (stat == null) { ShowError("Статуса нет."); return; }
			try { WorkDB.DeleteStatus(stat); }
			catch { ShowError(); }
			UpdateTable(WorkDB.ListStatus());
		}
	}
}