using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Diplom_B.DB;

namespace Diplom_B
{
	public partial class DocForm : 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 = "";
			invNumBox.Text = "";
			decNumBox.Text = "";
			nameBox.Text = "";
			primechanieBox.Text = "";
			UpdateLink();
			UpdateDogTable();
			UpdateIzvTable();
		}
		private void UpdateTable(Document[] arr, bool reset_cursor = false)
		{
			var selected = (!reset_cursor && docGridView.SelectedRows.Count > 0) ? docGridView.SelectedRows[0].Index : -1;
			{
				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("InvNum", "Инв. №");
				c["InvNum"].Width = 100;
				c.Add("DecNum", "Дец. №");
				c["DecNum"].Width = 100;
				c.Add("Name", "Название");
				c["Name"].Width = 100;
				c.Add("Prim", "Примечание");
				c["Prim"].Width = 150;
				c["Prim"].DefaultCellStyle.WrapMode = DataGridViewTriState.True;
			}
			{
				var r = docGridView.Rows;
				foreach (var doc in arr)
					r.Add(new object[] {
						doc.Id,
						doc.InvNum,
						doc.DecNum,
						doc.Name,
						doc.Primechanie
					});
			}
			if (docGridView.Rows.Count > 0)
				docGridView.Rows[0].Selected = true;
			if (selected != -1 && selected < docGridView.Rows.Count)
				for (var i = 0; i < docGridView.Rows.Count; i++)
					docGridView.Rows[i].Selected = (i == selected);
			docGridView_CurrentCellChanged(this, new EventArgs());
		}

		private void UpdateDogTable()
		{
			{
				var r = dogGridView.Rows;
				while (r.Count > 0)
					r.Remove(r[0]);
				var c = dogGridView.Columns;
				while (c.Count > 0)
					c.Remove(c[0]);
			}
			{
				var c = dogGridView.Columns;
				c.Add("Id", "№");
				c["Id"].Width = 40;
				c.Add("DogNum", "Дог. №");
				c["DogNum"].Width = 120;
			}
			{
				if (!int.TryParse(idLabel.Text, out int idRes)) return;
				var arr = WorkDB.GetDogovorFromDocumenty(idRes);
				var r = dogGridView.Rows;
				foreach (var dog in arr)
					r.Add(new object[] {
						dog.Id,
						dog.DogNum
					});
			}
		}
		private void UpdateIzvTable()
		{
			{
				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", "Изв. №");
				c["IzvNum"].Width = 120;
			}
			{
				if (!int.TryParse(idLabel.Text, out int idRes)) return;
				var arr = WorkDB.GetIzvechenieFromDocumenty(idRes);
				var r = izvGridView.Rows;
				foreach (var izv in arr)
					r.Add(new object[] {
						izv.Id,
						izv.IzvNum
					});
			}
		}

		public DocForm(bool needReturn = false)
		{
			InitializeComponent();
			this.needReturn = needReturn;
			try
      {
				UpdateTable(WorkDB.ListDocumenty(searchBox.Text));
				Init();
      }
			catch { throw; }
		}
		private void Init()
		{
			if (Program.user == null) this.Close();
			if (this.needReturn)
			{
				selectButton.Visible = true;
				mainMenuStrip.Visible = false;
				groupBox3.Visible = false;
				groupBox4.Visible = false;
				this.Height = 385;
			}
			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[1].Enabled = false;
			}
			{
				deleteButton.Enabled = Program.user.Usr.Doc > 2;
				createButton.Enabled = Program.user.Usr.Doc > 2;
				changeButton.Enabled = Program.user.Usr.Doc > 1;
				fileLoadButton.Enabled = Program.user.Usr.Doc > 1;
				resetFileButton.Enabled = Program.user.Usr.Doc > 1;
				addDogButton.Enabled = Program.user.Usr.Doc > 1;
				delDogButton.Enabled = Program.user.Usr.Doc > 1;
				addIzvButton.Enabled = Program.user.Usr.Doc > 1;
				delIzvButton.Enabled = Program.user.Usr.Doc > 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)
		{
			try
			{
				filterDrop = new Task(() =>
				{
					var fd = filterDrop.Id;
					Task.Delay(1000).Wait();
					if (filterDrop.Id == fd)
						if (InvokeRequired) Invoke((Action)(() => { UpdateTable(WorkDB.ListDocumenty(searchBox.Text)); }));
						else UpdateTable(WorkDB.ListDocumenty(searchBox.Text));

				});
				filterDrop.Start();
			}
			catch (Exception ex) { ShowError(ex.Message); }
		}
		private void resetSearchButton_Click(object sender, EventArgs e)
		{
			searchBox.Text = "";
			filterDrop = new Task(() => { return; });
			UpdateTable(WorkDB.ListDocumenty(searchBox.Text));
		}

		private void docGridView_CurrentCellChanged(object sender, EventArgs e)
		{
			ClearBoxes();
			if (docGridView.SelectedRows.Count != 1)
				return;
			{
				var doc = WorkDB.GetDocument((int)docGridView.SelectedRows[0].Cells[0].Value);
				if (doc == null)
					return;
				idLabel.Text = doc.Id.ToString();
				invNumBox.Text = doc.InvNum;
				decNumBox.Text = doc.DecNum;
				nameBox.Text = doc.Name;
				primechanieBox.Text = doc.Primechanie;
				UpdateLink(doc.FileName, doc.FileStruct);
				UpdateDogTable();
				UpdateIzvTable();
			}
		}

		private void createButton_Click(object sender, EventArgs e)
		{
			try
			{
				var r = new Document()
				{
					InvNum = invNumBox.Text,
					DecNum = decNumBox.Text,
					Name = nameBox.Text,
					Primechanie = primechanieBox.Text,
					FileName = fileName,
					FileStruct = fileStruct
				};
				WorkDB.AddDocument(r);
				UpdateTable(WorkDB.ListDocumenty(searchBox.Text));
			}
			catch { ShowError(); }
		}
		private void changeButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int idRes)) { ShowError("Документ не выбрано."); return; }
			var doc = WorkDB.GetDocument(idRes);
			if (doc == null) { ShowError("Нет документа в БД."); return; }
			try
			{
				doc.InvNum = invNumBox.Text;
				doc.DecNum = decNumBox.Text;
				doc.Name = nameBox.Text;
				doc.Primechanie = primechanieBox.Text;
				doc.FileName = fileName;
				doc.FileStruct = fileStruct;
				WorkDB.ChangeDocument(doc);
			}
			catch { ShowError(); }
			UpdateTable(WorkDB.ListDocumenty(searchBox.Text));
		}
		private void deleteButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int idRes)) { ShowError("Документ не выбран."); return; }
			if (WorkDB.GetDogovorFromDocumenty(idRes).Length > 0) { ShowError("Есть связанные договора."); return; }
			if (WorkDB.GetIzvechenieFromDocumenty(idRes).Length > 0) { ShowError("Есть связанные извещения."); return; }
			var doc = WorkDB.GetDocument(idRes);
			if (doc == null) { ShowError("Документа не существует."); return; }
			try
			{
				WorkDB.DeleteDocument(doc);
			}
			catch { ShowError(); }
			UpdateTable(WorkDB.ListDocumenty(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 addDogButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int docId)) { ShowError("Документ не выбран."); return; }
			var form = new DogForm(true);
			form.ShowDialog();
			var dogId = form.returnId;
			if (!dogId.HasValue) { return; }
			if (WorkDB.GetDogDoc(dogId.Value, docId) != null) { ShowError("Договор уже в списке."); return; }
			var dd = new DogDoc() { DogovorId = dogId.Value, DocumentId = docId };
			WorkDB.AddDogDoc(dd);
			UpdateDogTable();
		}
		private void delDogButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int docId)) { ShowError("Документ не выбран."); return; }
			if (dogGridView.SelectedRows.Count != 1) { return; }
			var dogId = (int)dogGridView.SelectedRows[0].Cells[0].Value;
			var dd = WorkDB.GetDogDoc(dogId, docId);
			if (dd == null) { ShowError("Записи нет в БД."); return; }
			WorkDB.DeleteDogDoc(dd);
			UpdateDogTable();
		}

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

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

	}
}