using PIC_Simulator.PIC;
using PIC_Simulator.Properties;
using System;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows.Forms;

namespace PIC_Simulator
{
	public partial class Form1 : Form
	{
		private PICProgramm programm;

		private Timer quartztimer;

		public Form1()
		{
			InitializeComponent();

			quartztimer = new Timer();
			quartztimer.Tick += timer1_Tick;

			for (int i = 0; i < 32; i++)
			{
				var item = new ListViewItem(new[] {"00", "00", "00", "00", "00", "00", "00", "00"});
				lvMemory.Items.Add(item);
			}

			lvSpecial.Items.Add(new ListViewItem(new[] { "W", "0x00" }));
			lvSpecial.Items.Add(new ListViewItem(new[] { "PC", "0x00" }));
			lvSpecial.Items.Add(new ListViewItem(new[] { "Status", "0b00000000" }));
			lvSpecial.Items.Add(new ListViewItem(new[] { "Time", "0ms" }));
		}

		private void Form1_Load(object sender, EventArgs e)
		{
			box_CodeView.Font = new Font("Consolas", 8);

			box_CodeView.Text = Resources.TPicSim1;

			programm = new PICProgramm();
			programm.Laden(Resources.TPicSim1);

			OberflaecheAktualisieren();
		}

		private void cmd_Start_Click(object sender, EventArgs e)
		{
			quartztimer.Stop();
			quartztimer.Interval = int.Parse(insertTime.Text);
			quartztimer.Start();
		}

		private void cmd_next_Click(object sender, EventArgs e)
		{
			StepProgramm();
		}

		private void programmÖffnenToolStripMenuItem_Click(object sender, EventArgs e)
		{
			if (openFileDialog1.ShowDialog() == DialogResult.OK)
			{
				string datei = File.ReadAllText(openFileDialog1.FileName);

				box_CodeView.Text = datei;

				programm = new PICProgramm();
				programm.Laden(datei);

				OberflaecheAktualisieren();
			}
		}

		private void cmdOpenDoc_Click(object sender, EventArgs e)
		{
			string path = Path.GetTempFileName() + ".pdf";
			File.WriteAllBytes(path, Resources.DataSheet);
			System.Diagnostics.Process.Start(path);
		}

		//Funktion um Zeile aktuell ausgeführte Zeile zu markieren
		void Highlight(int line)
		{
			int i1 = box_CodeView.GetFirstCharIndexFromLine(line);
			int i2 = box_CodeView.GetFirstCharIndexFromLine(line + 1);
			if (i2 < 0 || i1 < 0)
			{
				box_CodeView.SelectionStart = 0;
				box_CodeView.SelectionLength = box_CodeView.TextLength;
				box_CodeView.SelectionBackColor = box_CodeView.BackColor;
			}
			else
			{
				box_CodeView.SelectionStart = 0;
				box_CodeView.SelectionLength = box_CodeView.TextLength;
				box_CodeView.SelectionBackColor = box_CodeView.BackColor;
				box_CodeView.SelectionStart = i1;
				box_CodeView.SelectionLength = i2 - i1;
				box_CodeView.SelectionBackColor = Color.SteelBlue;
			}
		}

		private void cmd_reset_Click(object sender, EventArgs e)
		{
			quartztimer.Stop();
			
			programm = new PICProgramm();
			programm.Laden(box_CodeView.Text);

			OberflaecheAktualisieren();
		}

		private void beendenToolStripMenuItem_Click(object sender, EventArgs e)
		{
			this.Close();
		}

		private void timer1_Tick(object sender, EventArgs e)
		{
			StepProgramm();
		}

		private void cmd_Stop_Click(object sender, EventArgs e)
		{
			quartztimer.Stop();
		}

		private void StepProgramm()
		{
			bool finished = programm.Step();

			if (finished) { quartztimer.Stop(); MessageBox.Show("Finished"); return; }

			OberflaecheAktualisieren();
		}

		private void OberflaecheAktualisieren()
		{
			// Zeile highlighten

			if (programm.befehle.Count > 0 && programm.PCCounter < programm.befehle.Count)
			{
				Highlight(programm.befehle[programm.PCCounter].zeilennummer);
			}

			// Memory aktualisieren

			for (int y = 0; y < 32; y++)
			{
				for (int x = 0; x < 8; x++)
				{
					string nummer = string.Format("{0:X2}", programm.Register[y*8 + x]);
					if (nummer != lvMemory.Items[y].SubItems[x].Text) lvMemory.Items[y].SubItems[x].Text = nummer;
				}
			}

			// Spezialregister aktualisieren

			lvSpecial.Items[0].SubItems[1].Text = string.Format("0x{0:X2}", programm.Register_W);
			lvSpecial.Items[1].SubItems[1].Text = string.Format("{0,4}", programm.PCCounter);
			lvSpecial.Items[2].SubItems[1].Text = string.Format("0b{0}", Convert.ToString(programm.GetRegisterOhneBank(PICProgramm.ADDR_STATUS), 2).PadLeft(8, '0'));
			lvSpecial.Items[1].SubItems[1].Text = string.Format("{0}ms", programm.Stepcount * int.Parse(insertTime.Text));

			lbStack.Items.Clear();
			foreach (var u in programm.Stack) lbStack.Items.Add(u.ToString());
		}
	}
}