using trakker.Models;

namespace trakker.Forms
{
    /// <summary>
    /// Form used to view and edit a <see cref="Client"/> model. Fields on the form
    /// are data-bound to the provided client instance and basic validation is
    /// performed on required fields.
    /// </summary>
    public partial class ClientForm : Form
    {
        /// <summary>
        /// The client instance being edited by this form.
        /// </summary>
        private readonly Client _client;

        /// <summary>
        /// Binding source that connects the client model to the form controls.
        /// </summary>
        private BindingSource bindingSource = new BindingSource();

        /// <summary>
        /// Error provider used to display validation errors next to input controls.
        /// </summary>
        private ErrorProvider errorProvider = new ErrorProvider();

        /// <summary>
        /// Initializes a new instance of the <see cref="ClientForm"/> class bound to
        /// the provided <paramref name="client"/>. Sets up data bindings for all
        /// visible input controls and configures dialog button behavior.
        /// </summary>
        /// <param name="client">The <see cref="Client"/> instance to edit. Must not be null.</param>
        public ClientForm(Client client)
        {
            _client = client;
            InitializeComponent();

            // Bind model properties to controls so the UI reflects and updates the model.
            bindingSource.DataSource = _client;
            textBoxName.DataBindings.Add("Text", bindingSource, "Name", true);
            textBoxCompany.DataBindings.Add("Text", bindingSource, "Company", true);
            textBoxEmail.DataBindings.Add("Text", bindingSource, "Email", true);
            maskedTextBox_Phone.DataBindings.Add("Text", bindingSource, "Phone", true);
            textBoxAddressStreet.DataBindings.Add("Text", bindingSource, "AddressStreet", true);
            textBoxAddressCity.DataBindings.Add("Text", bindingSource, "AddressCity", true);
            comboBoxAddressState.DataBindings.Add("Text", bindingSource, "AddressState", true);
            maskedTextBoxAddressPostal.DataBindings.Add("Text", bindingSource, "AddressPostal", true);
            richTextBoxNotes.DataBindings.Add("Text", bindingSource, "Notes", true);

            // Configure dialog buttons and window behavior.
            buttonOkay.DialogResult = DialogResult.OK;
            buttonCancel.DialogResult = DialogResult.Cancel;
            this.CancelButton = CancelButton;
            this.StartPosition = FormStartPosition.CenterParent;
        }

        /// <summary>
        /// Gets the <see cref="Client"/> instance edited by the form.
        /// </summary>
        public Client Client { get => _client; private set { } }

        /// <summary>
        /// Validates the Name field. If the name is empty or whitespace, an error is set
        /// on the <see cref="errorProvider"/> and the event is canceled to prevent the
        /// form from closing.
        /// </summary>
        private void textBoxName_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(textBoxName.Text))
            {
                errorProvider.SetError(textBoxName, "Name is required.");
                errorProvider.SetIconAlignment(textBoxName, ErrorIconAlignment.MiddleRight);
                errorProvider.SetIconPadding(textBoxName, 2);
                e.Cancel = true;
            }
            else
            {
                errorProvider.SetError(textBoxName, "");
            }
        }

        /// <summary>
        /// Validates the Email field. If the email is empty or whitespace, an error is set
        /// on the <see cref="errorProvider"/> and the event is canceled to prevent the
        /// form from closing. Note: this validation only checks presence, not format.
        /// </summary>
        private void textBoxEmail_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(textBoxEmail.Text))
            {
                errorProvider.SetError(textBoxEmail, "Email is required.");
                errorProvider.SetIconAlignment(textBoxEmail, ErrorIconAlignment.MiddleRight);
                errorProvider.SetIconPadding(textBoxEmail, 2);
                e.Cancel = true;
            }
            else
            {
                errorProvider.SetError(textBoxEmail, "");
            }
        }
    }
}