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

namespace api42_Homework2 {
    public partial class frmEmployee : Form {
        public frmEmployee() {
            InitializeComponent();
        }

        private void btnFindEmployee_Click(object sender, EventArgs e) {
            string strPath = @"C:\Users\Adrian\Desktop\company.txt";
            string[] strArray = File.ReadAllLines(strPath);
            int employeeNum;
            bool inputExists = false;

            if (txtEmployee.Text.Trim() == "") return;

            if (int.TryParse(txtEmployee.Text, out employeeNum)) {
                foreach (string employeeStr in strArray) {
                    string[] employeeDetails = employeeStr.Split(',');

                    if (int.Parse(employeeDetails[0]) == employeeNum) {
                        lblEmployeeOutput.Text = string.Format("Employee ID: {0}\nFirst Name: {1}\nLast Name: {2}\nDepartment ID: {3}", employeeDetails[0], employeeDetails[2], employeeDetails[3], employeeDetails[1]);
                        inputExists = true;
                    }
                }
            } else {
                foreach (string employeeStr in strArray) {
                    string[] employeeDetails = employeeStr.Split(',');
                    string[] inputSplit = txtEmployee.Text.Split(' ');

                    if (inputSplit.Length >= 2 && employeeStr.Contains(inputSplit[0]) && employeeStr.Contains(inputSplit[1])) {
                        lblEmployeeOutput.Text = string.Format("Employee ID: {0}\nFirst Name: {1}\nLast Name: {2}\nDepartment ID: {3}", employeeDetails[0], employeeDetails[2], employeeDetails[3], employeeDetails[1]);
                        inputExists = true;
                    }
                    if (!inputExists) {
                        lblEmployeeOutput.Text = "Unable to find employee: " + txtEmployee.Text;
                    }
                }
            }
        }

        private void btnUpdateDept_Click(object sender, EventArgs e) {
            string strPath = @"C:\Users\Adrian\Desktop\company.txt";
            string[] strArray = File.ReadAllLines(strPath);
            int num;

            if (!lblEmployeeOutput.Text.Contains("Employee ID:")) return;
            if (!int.TryParse(txtNewDeptID.Text, out num) || num < 1 || num > 7){
                MessageBox.Show("Please enter a number between 1 and 7 inclusive.");
            }

            string[] employeeDetails = lblEmployeeOutput.Text.Split('\n');

            for (int i = 0; i < employeeDetails.Length; i++) {
                employeeDetails[i] = employeeDetails[i].Split(new string[] { ": " }, StringSplitOptions.None)[1];
            }

            employeeDetails[3] = txtNewDeptID.Text;
            using (StreamWriter writer = new StreamWriter(strPath, false)) {
                foreach (string line in strArray) {
                    if (line.Contains(employeeDetails[0])) {
                        string newLine = string.Format("{0},{1},{2},{3}", employeeDetails[0], employeeDetails[3], employeeDetails[1], employeeDetails[2]);
                        writer.WriteLine(newLine);
                    } else {
                        writer.WriteLine(line);
                    }
                }
            }
        }

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

        private void btnAddEmployee_Click(object sender, EventArgs e) {
            string[] employeeNew = {txtEmployeeNum.Text, txtDeptId.Text, txtFirstName.Text, txtLastName.Text};
            string strPath = @"C:\Users\Adrian\Desktop\company.txt";
            string[] strArray = File.ReadAllLines(strPath);
            int num;


            foreach (string newDetail in employeeNew) {
                if (newDetail.Trim() == "") {
                    MessageBox.Show("Please fill out all the fields");
                    return;
                }
            }

            foreach (string line in strArray) {
                if (line.Contains(employeeNew[0])) {
                    MessageBox.Show("This employee number is already in use.");
                    return;
                }
            }
            if (employeeNew[0].Length != 9) {
                MessageBox.Show("Employee numbers must be 9 digits long.");
                return;
            }
            if (!int.TryParse(employeeNew[1], out num) || num < 1 || num > 7) {
                MessageBox.Show("Department ID must be between 1 and 7 inclusive.");
                return;
            }

            using (StreamWriter writer = new StreamWriter(strPath, false)) {
                foreach (string line in strArray) {
                    writer.WriteLine(line);
                }
                writer.WriteLine(string.Format("{0},{1},{2},{3}", employeeNew[0], employeeNew[1], employeeNew[2], employeeNew[3]));
            }
        }

        private void btnClear_Click(object sender, EventArgs e) {
            txtDeptId.Text = "";
            txtEmployee.Text = "";
            txtEmployeeNum.Text = "";
            txtFirstName.Text = "";
            txtLastName.Text = "";
            txtNewDeptID.Text = "";
            lblEmployeeOutput.Text = "";
            txtEmployee.Focus();
        }
    }
}