using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Zelvaci
{
    public partial class InteractiveViewForm : Form
    {
        private int steps = 1;
        public List<pair> prog = new List<pair>();
        private int maxSteps = 0;

        public InteractiveViewForm()
        {
            InitializeComponent();
        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            if (maxSteps == 0) {
                int pppp = 0;
                foreach (pair p in prog) {
                    switch (p.typ) {
                        case prikaz.FORWARD:
                            if (pppp > 0) {
                                maxSteps++;
                            }
                            break;
                        case prikaz.PEN:
                            pppp = p.parameters[0];
                            break;
                    }
                }
            }
            if (maxSteps <= 1) {
                nextButton.Enabled = false;
                if(maxSteps == 0)
                    return;
            }
            Graphics g = e.Graphics;
            g.FillRectangle(Brushes.White, 0, 0, 700, 700);
            Color c = Color.Black;
            float x = 350, y = 350; // pozice želvy
            int rotation = -90;
            int pen = 0;
            int stepsDone = 0;
            foreach (pair p in prog)
            {
                switch (p.typ) {
                    case prikaz.FORWARD:
                        
                        float endX = x + p.parameters[0] * (float)Math.Cos(rotation * (Math.PI / 180));
                        float endY = y + p.parameters[0] * (float)Math.Sin(rotation * (Math.PI / 180));
                        if (pen > 0) {
                            float startX = x;
                            float startY = y;
                            stepsDone++;
                            if (stepsDone == maxSteps)
                                pen = 10;
                            g.DrawLine(new Pen(c, pen), new PointF(startX, startY), new PointF(endX, endY));
                        }
                        x = endX;
                        y = endY;
                        break;
                    case prikaz.LEFT:
                        rotation -= p.parameters[0];
                        break;
                    case prikaz.RIGHT:
                        rotation += p.parameters[0];
                        break;
                    case prikaz.PEN:
                        pen = p.parameters[0];
                        break;
                    case prikaz.COLOR:
                        int r, gg, b;
                        r = Math.Max(0, Math.Min(255, p.parameters[0]));
                        gg = Math.Max(0, Math.Min(255, p.parameters[1]));
                        b = Math.Max(0, Math.Min(255, p.parameters[2]));
                        c = Color.FromArgb(r, gg, b);
                        break;
                }

                if (steps == stepsDone)
                    break;
            }

            if (steps == maxSteps && stepsDone == maxSteps) {
                g.FillEllipse(Brushes.Red, x - 5, y - 5, 10, 10);
                float endX = x + 12 * (float)Math.Cos(rotation * (Math.PI / 180));
                float endY = y + 12 * (float)Math.Sin(rotation * (Math.PI / 180));
                g.DrawLine(Pens.Red, new PointF(x, y), new PointF(endX, endY));
            }
            
        }

        private void nextButton_Click(object sender, EventArgs e)
        {
            
            prevButton.Enabled = true;
            if (steps != maxSteps) {
                steps++;
                pictureBox1.Refresh();
            }
            if (steps == maxSteps)
                nextButton.Enabled = false;
        }

        private void prevButton_Click(object sender, EventArgs e) {
            nextButton.Enabled = true;
            if (steps != 0) {
                steps--;
                pictureBox1.Refresh();
            }
            if (steps == 0)
                prevButton.Enabled = false;
        }
    }
}