using System;
using System.IO;
using System.Threading.Tasks;
using System.Windows.Forms;
using Diplom_B.DB;

namespace Diplom_B
{
	public partial class IzvForm : Form
	{
		public int? returnId = null;
		private bool needReturn = false;

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

		private string fileName = "";
		private byte[] fileStruct = null;
		private void UpdateLink(string name = null, byte[] strct = null)
		{
			var size = 23;
			linkFileLabel.Text = "";
			linkFileLabel.Visible = false;
			fileName = name;
			fileStruct = strct;
			if (string.IsNullOrEmpty(fileName) || fileStruct == null || fileStruct.Length <= 0)
				return;
			linkFileLabel.Text = (fileName.Length > size) ? fileName.Substring(0, size - 3) + "..." : fileName;
			linkFileLabel.Visible = true;
		}

		private void ClearBoxes()
		{
			idLabel.Text = "";
			izvNumBox.Text = "";
			invNumBox.Text = "";
			izmNumBox.Text = "";
			ukazZadBox.Text = "";
			ukazVnedrBox.Text = "";
			UpdateLink();
			UpdateDocTable();
		}
		private void UpdateTable(Izveschenie[] arr, bool reset_cursor = false)
		{
			var selected = (!reset_cursor && izvGridView.SelectedRows.Count > 0) ? izvGridView.SelectedRows[0].Index : -1;
			{
				var r = izvGridView.Rows;
				while (r.Count > 0)
					r.Remove(r[0]);
				var c = izvGridView.Columns;
				while (c.Count > 0)
					c.Remove(c[0]);
			}
			{
				var c = izvGridView.Columns;
				c.Add("Id", "№");
				c["Id"].Width = 40;
				c.Add("IzvNum", "Извещение №");
				c["IzvNum"].Width = 90;
				c.Add("InvNum", "Инв. №");
				c["InvNum"].Width = 60;
				c.Add("IzmNum", "Изм. №");
				c["IzmNum"].Width = 60;
				c.Add("UkazZad", "Указания о заделе");
				c["UkazZad"].Width = 130;
				c.Add("UkazVnedr", "Указания о внедр.");
				c["UkazVnedr"].Width = 130;
			}
			{
				var r = izvGridView.Rows;
				foreach (var izv in arr)
					r.Add(new object[] {
						izv.Id,
						izv.IzvNum,
						izv.InvNum,
						izv.IzmNum,
						izv.UkazZad,
						izv.UkazVnedr
					});
			}
			if (izvGridView.Rows.Count > 0)
				izvGridView.Rows[0].Selected = true;
			if (selected != -1 && selected < izvGridView.Rows.Count)
				for (var i = 0; i < izvGridView.Rows.Count; i++)
					izvGridView.Rows[i].Selected = (i == selected);
			izvGridView_CurrentCellChanged(this, new EventArgs());
		}

		private void UpdateDocTable()
    {
			{
				var r = docGridView.Rows;
				while (r.Count > 0)
					r.Remove(r[0]);
				var c = docGridView.Columns;
				while (c.Count > 0)
					c.Remove(c[0]);
			}
			{
				var c = docGridView.Columns;
				c.Add("Id", "№");
				c["Id"].Width = 40;
				c.Add("DecNum", "Дец. №");
				c["DecNum"].Width = 120;
			}
			{
				if (!int.TryParse(idLabel.Text, out int idRes)) return;
				var arr = WorkDB.GetDocumentyFromIzvechenie(idRes);
				var r = docGridView.Rows;
				foreach (var doc in arr)
					r.Add(new object[] {
						doc.Id,
						doc.DecNum
					});
			}
		}

		public IzvForm(bool needReturn = false)
		{
			InitializeComponent();
			this.needReturn = needReturn;
			try
			{
				UpdateTable(WorkDB.ListIzveschenie(searchBox.Text));
				Init();
			}
			catch { ShowError(); }
		}
		private void Init()
		{
			if (Program.user == null) this.Close();
			if (this.needReturn)
			{
				selectButton.Visible = true;
				mainMenuStrip.Visible = false;
				groupBox3.Visible = false;
				this.Height = 360;
			}
			else
			{
				mainMenuStrip.Items[0].Enabled = Program.user.Usr.Dog > 0;
				mainMenuStrip.Items[1].Enabled = Program.user.Usr.Doc > 0;
				mainMenuStrip.Items[2].Enabled = Program.user.Usr.Izv > 0;
				mainMenuStrip.Items[3].Enabled = Program.user.Usr.Post > 0;
				mainMenuStrip.Items[4].Enabled = Program.user.Usr.Izd > 0;
				mainMenuStrip.Items[5].Enabled = Program.user.Usr.Zak > 0;
				mainMenuStrip.Items[6].Enabled = Program.user.Usr.Set > 0;
				mainMenuStrip.Items[2].Enabled = false;
			}
			{
				deleteButton.Enabled = Program.user.Usr.Izv > 2;
				createButton.Enabled = Program.user.Usr.Izv > 2;
				changeButton.Enabled = Program.user.Usr.Izv > 1;
				fileLoadButton.Enabled = Program.user.Usr.Izv > 1;
				resetFileButton.Enabled = Program.user.Usr.Izv > 1;
				addDocButton.Enabled = Program.user.Usr.Izv > 1;
				deleteDocButton.Enabled = Program.user.Usr.Izv > 1;

			}
		}

		private void fileLoadButton_Click(object sender, EventArgs e)
		{
			try
			{
				if (selectFileDialog.ShowDialog() != DialogResult.Cancel)
					if (!string.IsNullOrEmpty(selectFileDialog.FileName))
					{
						var fn = Path.GetFileName(selectFileDialog.FileName);
						var fb = File.ReadAllBytes(selectFileDialog.FileName);
						UpdateLink(fn, fb);
					}
			}
			catch { ShowError(); }
    }
    private void resetFileButton_Click(object sender, EventArgs e)
		{
			UpdateLink();
		}
		private void linkFileLabel_Click(object sender, EventArgs e)
		{
			if (saveFileDialog.ShowDialog() != DialogResult.Cancel)
				if (!string.IsNullOrEmpty(saveFileDialog.FileName))
					File.WriteAllBytes(saveFileDialog.FileName, fileStruct);
		}

		private Task filterDrop;
		private void searchBox_TextChanged(object sender, EventArgs e)
		{
			filterDrop = new Task(() =>
			{
				var fd = filterDrop.Id;
				Task.Delay(1000).Wait();
				if (filterDrop.Id == fd)
					if (InvokeRequired) Invoke((Action)(() => { UpdateTable(WorkDB.ListIzveschenie(searchBox.Text)); }));
					else UpdateTable(WorkDB.ListIzveschenie(searchBox.Text));

			});
			filterDrop.Start();
		}
		private void resetSearchButton_Click(object sender, EventArgs e)
		{
			searchBox.Text = "";
			filterDrop = new Task(() => { return; });
			UpdateTable(WorkDB.ListIzveschenie(searchBox.Text));
		}

		private void izvGridView_CurrentCellChanged(object sender, EventArgs e)
		{
			ClearBoxes();
			if (izvGridView.SelectedRows.Count != 1)
				return;
			{
				var izv = WorkDB.GetIzveschenie((int)izvGridView.SelectedRows[0].Cells[0].Value);
				if (izv == null)
					return;
				idLabel.Text = izv.Id.ToString();
				izvNumBox.Text = izv.IzvNum;
				invNumBox.Text = izv.InvNum.ToString();
				izmNumBox.Text = izv.IzmNum.ToString();
				ukazZadBox.Text = izv.UkazZad;
				ukazVnedrBox.Text = izv.UkazVnedr;
				UpdateLink(izv.FileName, izv.FileStruct);
				UpdateDocTable();
			}
		}

		private void createButton_Click(object sender, EventArgs e)
		{

			if (!int.TryParse(invNumBox.Text, out int invNum)) { ShowError("Инв № не верен."); return; }
			if (!int.TryParse(izmNumBox.Text, out int izmNum)) { ShowError("Изм № не верен."); return; }
			try
			{
				var r = new Izveschenie()
				{
					IzvNum = izvNumBox.Text,
					InvNum = invNum,
					IzmNum = izmNum,
					UkazZad = ukazZadBox.Text,
					UkazVnedr = ukazVnedrBox.Text,
					FileName = fileName,
					FileStruct = fileStruct
				};
				WorkDB.AddIzveschenie(r);
				UpdateTable(WorkDB.ListIzveschenie(searchBox.Text));
			}
			catch { ShowError(); }
		}
    private void changeButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int idRes)) { ShowError("Извещение не выбрано."); return; }
			if (!int.TryParse(invNumBox.Text, out int invNum)) { ShowError("Инв № не верен."); return; }
			if (!int.TryParse(izmNumBox.Text, out int izmNum)) { ShowError("Изм № не верен."); return; }
			var izv = WorkDB.GetIzveschenie(idRes);
			if (izv == null) { ShowError("Нет извещения в БД."); return; }
			try
			{
				izv.IzvNum = izvNumBox.Text;
				izv.InvNum = invNum;
				izv.IzmNum = izmNum;
				izv.UkazZad = ukazZadBox.Text;
				izv.UkazVnedr = ukazVnedrBox.Text;
				izv.FileName = fileName;
				izv.FileStruct = fileStruct;
				WorkDB.ChangeIzveschenie(izv);
			}
			catch { ShowError(); }
			UpdateTable(WorkDB.ListIzveschenie(searchBox.Text));
		}
    private void deleteButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int idRes)) { ShowError("Извещение не выбрано."); return; }
			if (WorkDB.GetDocumentyFromIzvechenie(idRes).Length > 0) { ShowError("Есть связанные документы."); return; }
			var izv = WorkDB.GetIzveschenie(idRes);
			if (izv == null) { ShowError("Поставки не существует."); return; }
			try
			{
				WorkDB.DeleteIzveschenie(izv);
			}
			catch { ShowError(); }
			UpdateTable(WorkDB.ListIzveschenie(searchBox.Text));
		}
    private void resetButton_Click(object sender, EventArgs e)
		{
			ClearBoxes();
		}

		private void MenuItem_Click(object sender, EventArgs e)
		{
			object form = null;
			if ((ToolStripMenuItem)sender == mainMenuStrip.Items[0]) { form = new DogForm(); }
			if ((ToolStripMenuItem)sender == mainMenuStrip.Items[1]) { form = new DocForm(); }
			if ((ToolStripMenuItem)sender == mainMenuStrip.Items[2]) { form = new IzvForm(); }
			if ((ToolStripMenuItem)sender == mainMenuStrip.Items[3]) { form = new PostForm(); }
			if ((ToolStripMenuItem)sender == mainMenuStrip.Items[4]) { form = new IzdForm(); }
			if ((ToolStripMenuItem)sender == mainMenuStrip.Items[5]) { form = new ZakForm(); }
			if ((ToolStripMenuItem)sender == mainMenuStrip.Items[6]) { form = new SetForm(); }
			if (form != null)
			{
				this.Hide();
				((Form)form).Closed += (s, args) => this.Close();
				((Form)form).Show();
			}
		}

		private void addDocButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int izvId)) { ShowError("Извещение не выбрано."); return; }
			var form = new DocForm(true);
			form.ShowDialog();
			var docId = form.returnId;
			if (!docId.HasValue) { return; }
			if (WorkDB.GetDocIzv(docId.Value, izvId) != null) { ShowError("Документ уже в списке."); return; }
			var di = new DocIzv() { DocumentId = docId.Value, IzveschenieId = izvId };
			WorkDB.AddDocIzv(di);
			UpdateDocTable();
		}
		private void deleteDocButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int izvId)) { ShowError("Извещение не выбрано."); return; }
			if (docGridView.SelectedRows.Count != 1) { return; }
			var docId = (int)docGridView.SelectedRows[0].Cells[0].Value;
			var di = WorkDB.GetDocIzv(docId, izvId);
			if (di == null) { ShowError("Записи нет в БД."); return; }
			WorkDB.DeleteDocIzv(di);
			UpdateDocTable();
    }

		private void selectButton_Click(object sender, EventArgs e)
		{
			if (int.TryParse(idLabel.Text, out int idRes))
				returnId = idRes;
			this.Close();
		}

	}
}