using System.ComponentModel;
using trakker.Models;

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

        private BindingList<Client>? _clients;

        /// <summary>
        /// Binding source that connects the project 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="ProjectForm"/> class bound to
        /// the provided <paramref name="project"/>. Sets up data bindings for all
        /// visible input controls and configures dialog button behavior.
        /// </summary>
        /// <param name="project">The <see cref="Project"/> instance to edit. Must not be null.</param>
        /// <param name="clients">The list of <see cref="Client"/> instances to select from. Must not be null.</param>
        /// <param name="status">The binding source for status values. Must not be null.</param>
        public ProjectForm(Project project, BindingList<Client> clients, BindingSource status)
        {
            _project = project;
            _clients = clients;
            InitializeComponent();

            Text = "Project Details";

            comboBoxClient.DataSource = _clients;
            comboBoxClient.DisplayMember = "Name";
            comboBoxClient.ValueMember = "ClientId";

            dateTimePickerStartDate.Format = DateTimePickerFormat.Custom;
            dateTimePickerStartDate.CustomFormat = "yyyy-MM-dd";
            dateTimePickerEndDate.Format = DateTimePickerFormat.Custom;
            dateTimePickerEndDate.CustomFormat = "yyyy-MM-dd";

            // Bind model properties to controls so the UI reflects and updates the model.
            bindingSource.DataSource = _project;
            comboBoxClient.DataBindings.Add("SelectedValue", bindingSource, "ClientId", true);
            textBoxName.DataBindings.Add("Text", bindingSource, "ProjectName", true);
            richTextBoxDescription.DataBindings.Add("Text", bindingSource, "Description", true);
            dateTimePickerStartDate.DataBindings.Add("Value", bindingSource, "StartDate", true);
            dateTimePickerEndDate.DataBindings.Add("Value", bindingSource, "EndDate", true);
            textBoxHourlyRate.DataBindings.Add("Text", bindingSource, "HourlyRate", true);
            textBoxBudget.DataBindings.Add("Text", bindingSource, "Budget", true);
            comboBoxStatus.DataSource = status;
            comboBoxStatus.DisplayMember = "Display";
            comboBoxStatus.ValueMember = "Value";
            comboBoxStatus.DataBindings.Add("SelectedValue", bindingSource, "Status", true);
            richTextBoxNotes.DataBindings.Add("Text", bindingSource, "Notes", true);

            labelCreatedUpdatedDT.Text = $"Created: {_project.CreatedAt:G} | Updated: {_project.UpdatedAt:G}";

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

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

        public BindingList<Client>? Clients { get => _clients; set { _clients = value; } }

        /// <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, "");
            //}
        }

    }
}