using System;
using System.Globalization;
using Xunit;

namespace Terminal.Gui.ViewsTests;
public class DateFieldTests {
	[Fact, TestDate]
	public void Constructors_Defaults ()
	{
		var df = new DateField ();
		Assert.Equal (DateTime.MinValue, df.Date);
		Assert.Equal (1, df.CursorPosition);
		Assert.Equal (new Rect (0, 0, 12, 1), df.Frame);
		Assert.Equal (" 01/01/0001", df.Text);

		var date = DateTime.Now;
		df = new DateField (date);
		Assert.Equal (date, df.Date);
		Assert.Equal (1, df.CursorPosition);
		Assert.Equal (new Rect (0, 0, 12, 1), df.Frame);
		Assert.Equal ($" {date.ToString (CultureInfo.InvariantCulture.DateTimeFormat.ShortDatePattern)}", df.Text);

		df = new DateField (date) { X = 1, Y = 2 };
		Assert.Equal (date, df.Date);
		Assert.Equal (1, df.CursorPosition);
		Assert.Equal (new Rect (1, 2, 12, 1), df.Frame);
		Assert.Equal ($" {date.ToString (CultureInfo.InvariantCulture.DateTimeFormat.ShortDatePattern)}", df.Text);
	}

	[Fact, TestDate]
	public void CursorPosition_Min_Is_Always_One_Max_Is_Always_Max_Format ()
	{
		var df = new DateField ();
		Assert.Equal (1, df.CursorPosition);
		df.CursorPosition = 0;
		Assert.Equal (1, df.CursorPosition);
		df.CursorPosition = 11;
		Assert.Equal (10, df.CursorPosition);
	}

	[Fact, TestDate]
	public void CursorPosition_Min_Is_Always_One_Max_Is_Always_Max_Format_After_Selection ()
	{
		var df = new DateField ();
		// Start selection
		Assert.True (df.NewKeyDownEvent (new (KeyCode.CursorLeft | KeyCode.ShiftMask)));
		Assert.Equal (1, df.SelectedStart);
		Assert.Equal (1, df.SelectedLength);
		Assert.Equal (0, df.CursorPosition);
		// Without selection
		Assert.True (df.NewKeyDownEvent (new (KeyCode.CursorLeft)));
		Assert.Equal (-1, df.SelectedStart);
		Assert.Equal (0, df.SelectedLength);
		Assert.Equal (1, df.CursorPosition);
		df.CursorPosition = 10;
		Assert.True (df.NewKeyDownEvent (new (KeyCode.CursorRight | KeyCode.ShiftMask)));
		Assert.Equal (10, df.SelectedStart);
		Assert.Equal (1, df.SelectedLength);
		Assert.Equal (11, df.CursorPosition);
		Assert.True (df.NewKeyDownEvent (new (KeyCode.CursorRight)));
		Assert.Equal (-1, df.SelectedStart);
		Assert.Equal (0, df.SelectedLength);
		Assert.Equal (10, df.CursorPosition);
	}

	[Fact, TestDate]
	public void KeyBindings_Command ()
	{
		DateField df = new DateField (DateTime.Parse ("12/12/1971")) {
			ReadOnly = true
		};
		Assert.True (df.NewKeyDownEvent (new (KeyCode.Delete)));
		Assert.Equal (" 12/12/1971", df.Text);
		df.ReadOnly = false;
		Assert.True (df.NewKeyDownEvent (new (KeyCode.D | KeyCode.CtrlMask)));
		Assert.Equal (" 02/12/1971", df.Text);
		df.CursorPosition = 4;
		df.ReadOnly = true;
		Assert.True (df.NewKeyDownEvent (new (KeyCode.Delete)));
		Assert.Equal (" 02/12/1971", df.Text);
		df.ReadOnly = false;
		Assert.True (df.NewKeyDownEvent (new (KeyCode.Backspace)));
		Assert.Equal (" 02/02/1971", df.Text);
		Assert.True (df.NewKeyDownEvent (new (KeyCode.Home)));
		Assert.Equal (1, df.CursorPosition);
		Assert.True (df.NewKeyDownEvent (new (KeyCode.End)));
		Assert.Equal (10, df.CursorPosition);
		Assert.True (df.NewKeyDownEvent (new (KeyCode.A | KeyCode.CtrlMask)));
		Assert.Equal (1, df.CursorPosition);
		Assert.True (df.NewKeyDownEvent (new (KeyCode.E | KeyCode.CtrlMask)));
		Assert.Equal (10, df.CursorPosition);
		Assert.True (df.NewKeyDownEvent (new (KeyCode.CursorLeft)));
		Assert.Equal (9, df.CursorPosition);
		Assert.True (df.NewKeyDownEvent (new (KeyCode.CursorRight)));
		Assert.Equal (10, df.CursorPosition);
		// Non-numerics are ignored
		Assert.False (df.NewKeyDownEvent (new (KeyCode.A)));
		df.ReadOnly = true;
		df.CursorPosition = 1;
		Assert.True (df.NewKeyDownEvent (new (KeyCode.D1)));
		Assert.Equal (" 02/02/1971", df.Text);
		df.ReadOnly = false;
		Assert.True (df.NewKeyDownEvent (new (KeyCode.D1)));
		Assert.Equal (" 12/02/1971", df.Text);
		Assert.Equal (2, df.CursorPosition);
		Assert.True (df.NewKeyDownEvent (new (KeyCode.D | KeyCode.AltMask)));
		Assert.Equal (" 10/02/1971", df.Text);
	}

	[Fact, TestDate]
	public void Typing_With_Selection_Normalize_Format ()
	{
		DateField df = new DateField (DateTime.Parse ("12/12/1971")) {
			// Start selection at before the first separator /
			CursorPosition = 2
		};
		// Now select the separator /
		Assert.True (df.NewKeyDownEvent (new (KeyCode.CursorRight | KeyCode.ShiftMask)));
		Assert.Equal (2, df.SelectedStart);
		Assert.Equal (1, df.SelectedLength);
		Assert.Equal (3, df.CursorPosition);
		// Type 3 over the separator
		Assert.True (df.NewKeyDownEvent (new (KeyCode.D3)));
		// The format was normalized and replaced again with /
		Assert.Equal (" 12/12/1971", df.Text);
		Assert.Equal (4, df.CursorPosition);
	}

	[Fact, TestDate, AutoInitShutdown]
	public void Copy_Paste ()
	{
		DateField df1 = new DateField (DateTime.Parse ("12/12/1971"));
		DateField df2 = new DateField (DateTime.Parse ("12/31/2023"));
		// Select all text
		Assert.True (df2.NewKeyDownEvent (new (KeyCode.End | KeyCode.ShiftMask)));
		Assert.Equal (1, df2.SelectedStart);
		Assert.Equal (10, df2.SelectedLength);
		Assert.Equal (11, df2.CursorPosition);
		// Copy from df2
		Assert.True (df2.NewKeyDownEvent (new (KeyCode.C | KeyCode.CtrlMask)));
		// Paste into df1
		Assert.True (df1.NewKeyDownEvent (new (KeyCode.V | KeyCode.CtrlMask)));
		Assert.Equal (" 12/31/2023", df1.Text);
		Assert.Equal (11, df1.CursorPosition);
	}

	[Fact, TestDate]
	public void Date_Start_From_01_01_0001_And_End_At_12_31_9999 ()
	{
		DateField df = new DateField (DateTime.Parse ("01/01/0001"));
		Assert.Equal (" 01/01/0001", df.Text);
		df.Date = DateTime.Parse ("12/31/9999");
		Assert.Equal (" 12/31/9999", df.Text);
	}

	[Fact]
	public void Using_Pt_Culture ()
	{
		CultureInfo cultureBackup = CultureInfo.CurrentCulture;
		CultureInfo.CurrentCulture = new CultureInfo ("pt-PT");
		DateField df = new DateField (DateTime.Parse ("12/12/1971")) {
			// Move to the first 2
			CursorPosition = 2
		};
		// Type 3 over the separator
		Assert.True (df.NewKeyDownEvent (new (KeyCode.D3)));
		// If InvariantCulture was used this will fail but not with PT culture
		Assert.Equal (" 13/12/1971", df.Text);
		Assert.Equal ("13/12/1971", df.Date.ToString (CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern));
		Assert.Equal (4, df.CursorPosition);
		CultureInfo.CurrentCulture = cultureBackup;
	}
}