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

namespace Password_Generator
{
    public partial class Form1 : Form
    {
        public const int WM_NCLBUTTONDOWN = 0xA1;
        public const int HT_CAPTION = 0x2;

        [DllImportAttribute("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd,
                         int Msg, int wParam, int lParam);
        [DllImportAttribute("user32.dll")]
        public static extern bool ReleaseCapture();
        public Form1()
        {
            InitializeComponent();
        }
        Random rand = new Random();
        private void button1_Click(object sender, EventArgs e)
        {
            string b = "";
            string a = "";
            if (checkBox1.Checked == true)
            {
                if (!a.Contains("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"))
                    a += "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
            }
            if(checkBox1.Checked==false)
                if(a.Contains("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ)"))
                    a.Replace("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ","");


                if (checkBox2.Checked == true)
                {
                    if (!a.Contains("123456789"))
                        a += "123456789";
                }
            if (checkBox2.Checked == false)
                if (a.Contains("123456789)"))
                    a.Replace("123456789", "");

            if (checkBox3.Checked == true)
            {
                if (!a.Contains("~!@#$%^&*()_+=-[]}{;':/.,?><"))
                    a += "~!@#$%^&*()_+=-[]}{;':/.,?><";
            }
            if (checkBox3.Checked == false)
                if (a.Contains("~!@#$%^&*()_+=-[]}{;':/.,?><"))
                    a.Replace("~!@#$%^&*()_+=-[]}{;':/.,?><", "");

            if (textBox1.Text == "" || (checkBox1.Checked == false && checkBox2.Checked == false && checkBox3.Checked == false))
            {
                if (textBox1.Text == "" && (checkBox1.Checked == false && checkBox2.Checked == false && checkBox3.Checked == false))
                    MessageBox.Show("Nu ai introdus numărul de caractere şi nu ai ales tipul caracterelor!");
                else
                {
                    if (textBox1.Text == "")
                        MessageBox.Show("Nu ai ales numărul de caractere!");
                    if (checkBox1.Checked == false && checkBox2.Checked == false && checkBox3.Checked == false)
                        MessageBox.Show("Nu ai selectat niciun fel de caracter!");
                }

            }
            else
            {
                b = "";
                int c = Convert.ToInt32(textBox1.Text);
                for (int i = 1; i <= c; i++)
                {
                    b += a[rand.Next(0, a.Length)];

                }
                richTextBox1.Text = b;
            }






        }

        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!char.IsControl(e.KeyChar)
        && !char.IsDigit(e.KeyChar)
        && e.KeyChar != '.')
            {
                e.Handled = true;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (richTextBox1.Text != "")
                Clipboard.SetText(richTextBox1.Text);
        }

        private void label4_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void label4_MouseEnter(object sender, EventArgs e)
        {
            label4.BackColor = Color.White;
        }

        private void label4_MouseLeave(object sender, EventArgs e)
        {
            label4.BackColor = Color.DarkGray;
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void label1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
            }
        }
    }
}