using ApplicationServices;
using DataLayer;

namespace HangoverWinForms;

public partial class Form1
{
	private string deletedCheckedTemplate;

	private void Load_deletedTab()
	{
		deletedCheckedTemplate = deletedCheckedLbl.Text;
	}

	private void deletedTab_VisibleChanged(object sender, EventArgs e)
	{
		if (!deletedTab.Visible)
			return;

		if (deletedCbl.Items.Count == 0)
			reload();
	}

	private void deletedCbl_ItemCheck(object sender, ItemCheckEventArgs e)
	{
		// CheckedItems.Count is not updated until after the event fires
		setLabel(e.NewValue);
	}

	private void checkAllBtn_Click(object sender, EventArgs e)
	{
		for (var i = 0; i < deletedCbl.Items.Count; i++)
			deletedCbl.SetItemChecked(i, true);
	}

	private void uncheckAllBtn_Click(object sender, EventArgs e)
	{
		for (var i = 0; i < deletedCbl.Items.Count; i++)
			deletedCbl.SetItemChecked(i, false);
	}

	private async void saveBtn_Click(object sender, EventArgs e)
	{
		var libraryBooksToRestore = deletedCbl.CheckedItems.Cast<LibraryBook>().ToList();
		saveBtn.Enabled = false;
		var qtyChanges = await libraryBooksToRestore.RestoreBooksAsync();
		if (qtyChanges > 0)
			Invoke(reload);
		Invoke(() => saveBtn.Enabled = true);
	}

	private void reload()
	{
		deletedCbl.Items.Clear();
		List<LibraryBook> deletedBooks = DbContexts.GetDeletedLibraryBooks();

		foreach (var lb in deletedBooks.Where(lb => lb.Book.ContentType is not ContentType.Parent))
			deletedCbl.Items.Add(lb);

		setLabel();
	}

	private void setLabel(CheckState? checkedState = null)
	{
		var pre = deletedCbl.CheckedItems.Count;
		int count = checkedState switch
		{
			CheckState.Checked => pre + 1,
			CheckState.Unchecked => pre - 1,
			_ => pre,
		};

		deletedCheckedLbl.Text = string.Format(deletedCheckedTemplate, count, deletedCbl.Items.Count);
	}
}