using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Text.RegularExpressions;

using System.Windows.Forms;

using ExpenseTracker.Entity;

using ExpenseTracker.Controller;



namespace ExpenseTracker

{

    public partial class ExpenseForm : BaseForm

    {

        public delegate void ExpenseFormSaved();

        public event ExpenseFormSaved OnExpenseFormSaved;



        private ExpenseTracker.Controller.CategoryController _categoryController;

        private ExpenseTracker.Controller.ExpenseController _expenseController;

        private ExpenseTracker.Entity.Expense _expense;



        public ExpenseForm(ExpenseTracker.Entity.Account account) : base(account)

        {

            _categoryController = new CategoryController(account);

            _expenseController = new ExpenseController(account);

            _expense = new Expense();

            InitializeComponent();

        }



        protected override void OnLoad(EventArgs e)

        {

            PopulateCategoryComboBox();

            PopulateForm();

            btnDelete.Enabled = (FormAction == FormAction.Create) ? false : true;

            base.OnLoad(e);

        }



        public ExpenseTracker.Entity.Expense Expense

        {

            get { return _expense; }

            set { _expense = value; }

        }



        protected void PopulateForm()

        {

            if (FormAction == FormAction.Update && Expense.ExpenseID > 0)

            {

                Expense = _expenseController.GetExpense(Expense.ExpenseID);



                for (int i = 0; i < cbCategory.Items.Count; i++)

                {

                    Category category = cbCategory.Items[i] as Category;

                    if (category.CategoryID == Expense.CategoryID)

                    {

                        cbCategory.SelectedItem = cbCategory.Items[i];

                        break;

                    }

                }



                dtpTransactionDate.Value = Expense.TransactionDate;

                txtItem.Text = Expense.Item;

                txtDescription.Text = Expense.Description;

                SetDefaultNumberValue(txtAmount, Expense.Amount);

                SetDefaultNumberValue(txtGST, Expense.GST);

                SetDefaultNumberValue(txtPST, Expense.PST);

                SetDefaultNumberValue(txtTotal, Expense.Total);

                chkIsDisabled.Checked = Expense.IsDisabled;

            }

        }



        protected void PopulateCategoryComboBox()

        {

            cbCategory.Items.Clear();

            List<Category> list = _categoryController.GetCategories(TransactionType.Expense);

            foreach (Category item in list)

            {

                cbCategory.Items.Add(item);

            }

            cbCategory.DisplayMember = "Title";

            cbCategory.ValueMember = "CategoryID";

        }



        protected bool ValidateForm()

        {

            bool valid = true;

            StringBuilder sb = new StringBuilder();



            if (cbCategory.SelectedItem == null)

            {

                sb.Append("- Select category." + Environment.NewLine);

                valid = false;

            }



            if (String.IsNullOrEmpty(txtItem.Text.Trim()))

            {

                sb.Append("- Enter item." + Environment.NewLine);

                valid = false;

            }



            SetDefaultNumberValue(txtAmount, 0.0F);

            SetDefaultNumberValue(txtGST, 0.0F);

            SetDefaultNumberValue(txtPST, 0.0F);

            SetDefaultNumberValue(txtTotal, 0.0F);



            ValidateNumberValue(txtAmount, "- Enter valid amount.", ref sb, ref valid);

            ValidateNumberValue(txtGST, "- Enter valid GST.", ref sb, ref valid);

            ValidateNumberValue(txtPST, "- Enter valid PST.", ref sb, ref valid);

            ValidateNumberValue(txtTotal, "- Enter valid total.", ref sb, ref valid);



            if (!valid)

            {

                MessageBox.Show("Error:" + Environment.NewLine + sb.ToString());

            }



            return valid;

        }



        protected void FormToObject()

        {

            if (FormAction == FormAction.Create)

            {

                Expense = new Expense();

                Expense.TransactionDate = dtpTransactionDate.Value;

                if (cbCategory.SelectedItem != null)

                {

                    Category category = cbCategory.SelectedItem as Category;

                    Expense.CategoryID = category.CategoryID;

                }

                Expense.Item = txtItem.Text.Trim();

                Expense.Description = txtDescription.Text.Trim();

                Expense.Amount = GetNumberValue(txtAmount, 0.0F);

                Expense.GST = GetNumberValue(txtGST, 0.0F);

                Expense.PST = GetNumberValue(txtPST, 0.0F);

                Expense.Total = GetNumberValue(txtTotal, 0.0F);

                Expense.IsDisabled = chkIsDisabled.Checked;

            }

            else if (FormAction == FormAction.Update)

            {

                Expense.TransactionDate = dtpTransactionDate.Value;

                if (cbCategory.SelectedItem != null)

                {

                    Category category = cbCategory.SelectedItem as Category;

                    Expense.CategoryID = category.CategoryID;

                }

                Expense.Item = txtItem.Text.Trim();

                Expense.Description = txtDescription.Text.Trim();

                Expense.Amount = GetNumberValue(txtAmount, 0.0F);

                Expense.GST = GetNumberValue(txtGST, 0.0F);

                Expense.PST = GetNumberValue(txtPST, 0.0F);

                Expense.Total = GetNumberValue(txtTotal, 0.0F);

                Expense.IsDisabled = chkIsDisabled.Checked;

            }

        }



        private void btnCancel_Click(object sender, EventArgs e)

        {

            this.Close();

        }



        private void btnSave_Click(object sender, EventArgs e)

        {

            if (ValidateForm())

            {

                FormToObject();

                if (FormAction == FormAction.Create)

                {

                    _expenseController.InsertExpense(Expense);

                }

                else if (FormAction == FormAction.Update)

                {

                    _expenseController.UpdateExpense(Expense);

                }



                if (OnExpenseFormSaved != null)

                {

                    OnExpenseFormSaved();

                }

                this.Close();

            }

        }



        private void btnDelete_Click(object sender, EventArgs e)

        {

            if (MessageBox.Show("Are you sure to delete this expense?", "Delete Expense", MessageBoxButtons.YesNo) == DialogResult.Yes)

            {

                _expenseController.DeleteExpense(Expense.ExpenseID);

                if (OnExpenseFormSaved != null)

                {

                    OnExpenseFormSaved();

                }

                this.Close();

            }

        }    



        #region Leave event handlers

        private void txtAmount_Leave(object sender, EventArgs e)

        {

            float amount = GetNumberValue(txtAmount, 0.0F);

            float gst = amount * Configuration.Instance.GSTRate;

            float pst = amount * Configuration.Instance.PSTRate;

            float total = amount + gst + pst;

            txtGST.Text = gst.ToString("N2");

            txtPST.Text = pst.ToString("N2");

            txtTotal.Text = total.ToString("N2");

            SetDefaultNumberValue(txtAmount, 0.0F);

        }



        private void txtGST_Leave(object sender, EventArgs e)

        {

            float amount = GetNumberValue(txtAmount, 0.0F);

            float gst = GetNumberValue(txtGST, 0.0F);

            float pst = amount * Configuration.Instance.PSTRate;

            float total = amount + gst + pst;

            txtPST.Text = pst.ToString("N2");

            txtTotal.Text = total.ToString("N2");

            SetDefaultNumberValue(txtGST, 0.0F);

        }



        private void txtPST_Leave(object sender, EventArgs e)

        {

            float amount = GetNumberValue(txtAmount, 0.0F);

            float gst = GetNumberValue(txtGST, 0.0F);

            float pst = GetNumberValue(txtPST, 0.0F);

            float total = amount + gst + pst;

            txtTotal.Text = total.ToString("N2");

            SetDefaultNumberValue(txtPST, 0.0F);

        }



        private void txtTotal_Leave(object sender, EventArgs e)

        {

            SetDefaultNumberValue(txtTotal, 0.0F);

        }

        #endregion



        #region KeyPress event handlers

        private void txtAmount_KeyPress(object sender, KeyPressEventArgs e)

        {

            ValidateNumberValue(sender, e);

            TrySubmitForm(sender, e);

        }



        private void txtGST_KeyPress(object sender, KeyPressEventArgs e)

        {

            ValidateNumberValue(sender, e);

            TrySubmitForm(sender, e);

        }



        private void txtPST_KeyPress(object sender, KeyPressEventArgs e)

        {

            ValidateNumberValue(sender, e);

            TrySubmitForm(sender, e);

        }



        private void txtTotal_KeyPress(object sender, KeyPressEventArgs e)

        {

            ValidateNumberValue(sender, e);

            TrySubmitForm(sender, e);

        }



        private void txtItem_KeyPress(object sender, KeyPressEventArgs e)

        {

            TrySubmitForm(sender, e);

        }

        #endregion



        #region Number utilties

        private void SetDefaultNumberValue(TextBox textbox, float defaultValue)

        {

            if (String.IsNullOrEmpty(textbox.Text.Trim()))

            {

                textbox.Text = defaultValue.ToString("N2");

            }

        }



        private float GetNumberValue(TextBox textbox, float defaultValue)

        {

            float val = defaultValue;

            if (!String.IsNullOrEmpty(textbox.Text.Trim()))

            {

                if (float.TryParse(textbox.Text.Trim(), out val))

                {

                    return val;

                }

            }

            return val;

        }



        private void ValidateNumberValue(object sender, KeyPressEventArgs e)

        {

            Match match = Regex.Match(e.KeyChar.ToString(), @"\d|\.");

            if (!match.Success)

            {

                e.Handled = true;

            }

            else

            {

                TextBox textbox = (TextBox)sender;

                string text = textbox.Text.Trim() + e.KeyChar.ToString();

                if (!String.IsNullOrEmpty(text))

                {

                    float val;

                    if (!float.TryParse(text, out val))

                    {

                        e.Handled = true;

                    }

                }

            }

        }



        private void TrySubmitForm(object sender, KeyPressEventArgs e)

        {

            if (e.KeyChar == Convert.ToChar(Keys.Enter))

            {

                btnSave_Click(this, null);

            }

        }



        private void ValidateNumberValue(TextBox textbox, string message, ref StringBuilder sb, ref bool valid)

        {

            float val;

            if (!float.TryParse(textbox.Text.Trim(), out val))

            {

                sb.Append(message + Environment.NewLine);

                valid = false;

            }

        }

        #endregion 

            

    }

}