using Moq;
using Xunit.Abstractions;

namespace UnitTests_Parallelizable.TextTests;

public class CollectionNavigatorTests
{
    private static readonly string [] simpleStrings =
    {
        "apricot", // 0
        "arm", // 1
        "bat", // 2
        "batman", // 3
        "candle" // 4
    };

    private readonly ITestOutputHelper _output;

    public CollectionNavigatorTests (ITestOutputHelper output) { _output = output; }

    [Fact]
    public void AtSymbol ()
    {
        var strings = new [] { "apricot", "arm", "ta", "@bob", "@bb", "text", "egg", "candle" };

        var n = new CollectionNavigator (strings);
        Assert.Equal (3, n.GetNextMatchingItem (0, '@'));
        Assert.Equal (3, n.GetNextMatchingItem (3, 'b'));
        Assert.Equal (4, n.GetNextMatchingItem (3, 'b'));
    }

    [Fact]
    public void Cycling ()
    {
        // cycling with 'b'
        var n = new CollectionNavigator (simpleStrings);
        Assert.Equal (2, n.GetNextMatchingItem (0, 'b'));
        Assert.Equal (3, n.GetNextMatchingItem (2, 'b'));

        // if 4 (candle) is selected it should loop back to bat
        Assert.Equal (2, n.GetNextMatchingItem (4, 'b'));

        // cycling with 'a'
        n = new CollectionNavigator (simpleStrings);
        Assert.Equal (0, n.GetNextMatchingItem (-1, 'a'));
        Assert.Equal (1, n.GetNextMatchingItem (0, 'a'));

        // if 4 (candle) is selected it should loop back to apricot
        Assert.Equal (0, n.GetNextMatchingItem (4, 'a'));
    }

    [Fact]
    public void Delay ()
    {
        var strings = new [] { "$$", "$100.00", "$101.00", "$101.10", "$200.00", "apricot" };
        var current = 0;
        var n = new CollectionNavigator (strings);

        // No delay
        Assert.Equal (strings.IndexOf ("apricot"), current = n.GetNextMatchingItem (current, 'a'));
        Assert.Equal ("a", n.SearchString);
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$", n.SearchString);
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$$", n.SearchString);

        // Delay 
        Thread.Sleep (n.TypingDelay + 10);
        Assert.Equal (strings.IndexOf ("apricot"), current = n.GetNextMatchingItem (current, 'a'));
        Assert.Equal ("a", n.SearchString);

        Thread.Sleep (n.TypingDelay + 10);
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$", n.SearchString);

        Thread.Sleep (n.TypingDelay + 10);
        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$", n.SearchString);

        Thread.Sleep (n.TypingDelay + 10);
        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$", n.SearchString);

        Thread.Sleep (n.TypingDelay + 10);
        Assert.Equal (strings.IndexOf ("$101.10"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$", n.SearchString);

        Thread.Sleep (n.TypingDelay + 10);
        Assert.Equal (strings.IndexOf ("$101.10"), current = n.GetNextMatchingItem (current, '2')); // Shouldn't move
        Assert.Equal ("2", n.SearchString);
    }

    [Fact]
    public void FullText ()
    {
        var strings = new [] { "apricot", "arm", "ta", "target", "text", "egg", "candle" };

        var n = new CollectionNavigator (strings);
        var current = 0;
        Assert.Equal (strings.IndexOf ("ta"), current = n.GetNextMatchingItem (current, 't'));

        // should match "te" in "text"
        Assert.Equal (strings.IndexOf ("text"), current = n.GetNextMatchingItem (current, 'e'));

        // still matches text
        Assert.Equal (strings.IndexOf ("text"), current = n.GetNextMatchingItem (current, 'x'));

        // nothing starts texa so it should NOT jump to apricot
        Assert.Equal (strings.IndexOf ("text"), current = n.GetNextMatchingItem (current, 'a'));

        Thread.Sleep (n.TypingDelay + 100);

        // nothing starts "texa". Since were past timedelay we DO jump to apricot
        Assert.Equal (strings.IndexOf ("apricot"), current = n.GetNextMatchingItem (current, 'a'));
    }

    [Theory]
    [InlineData (KeyCode.A, true)]
    [InlineData (KeyCode.Z, true)]
    [InlineData (KeyCode.D0, true)]
    [InlineData (KeyCode.A | KeyCode.ShiftMask, true)]
    [InlineData (KeyCode.Z | KeyCode.ShiftMask, true)]
    [InlineData (KeyCode.Space, true)]
    [InlineData (KeyCode.Z | KeyCode.CtrlMask, false)]
    [InlineData (KeyCode.Z | KeyCode.AltMask, false)]
    [InlineData (KeyCode.F1, false)]
    [InlineData (KeyCode.Delete, false)]
    [InlineData (KeyCode.Esc, false)]
    [InlineData (KeyCode.ShiftMask, false)]
    public void IsCompatibleKey_Does_Not_Allow_Alt_And_Ctrl_Keys (KeyCode keyCode, bool compatible)
    {
        var m = new DefaultCollectionNavigatorMatcher ();
        Assert.Equal (compatible, m.IsCompatibleKey (keyCode));
    }

    [Fact]
    public void MinimizeMovement_False_ShouldMoveIfMultipleMatches ()
    {
        var strings = new [] { "$$", "$100.00", "$101.00", "$101.10", "$200.00", "apricot", "c", "car", "cart" };
        var current = 0;
        var n = new CollectionNavigator (strings);
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, "$$"));
        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, "$"));
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, "$$")); // back to top
        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, "$"));
        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, "$"));
        Assert.Equal (strings.IndexOf ("$101.10"), current = n.GetNextMatchingItem (current, "$"));
        Assert.Equal (strings.IndexOf ("$200.00"), current = n.GetNextMatchingItem (current, "$"));

        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, "$")); // back to top
        Assert.Equal (strings.IndexOf ("apricot"), current = n.GetNextMatchingItem (current, "a"));
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, "$")); // back to top

        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, "$100.00"));
        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, "$"));
        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, "$101.00"));
        Assert.Equal (strings.IndexOf ("$200.00"), current = n.GetNextMatchingItem (current, "$2"));

        Assert.Equal (strings.IndexOf ("$200.00"), current = n.GetNextMatchingItem (current, "$200.00"));
        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, "$101.00"));
        Assert.Equal (strings.IndexOf ("$200.00"), current = n.GetNextMatchingItem (current, "$2"));

        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, "$101.00"));
        Assert.Equal (strings.IndexOf ("$200.00"), current = n.GetNextMatchingItem (current, "$2"));

        Assert.Equal (strings.IndexOf ("car"), current = n.GetNextMatchingItem (current, "car"));
        Assert.Equal (strings.IndexOf ("cart"), current = n.GetNextMatchingItem (current, "car"));

        Assert.Equal (-1, current = n.GetNextMatchingItem (current, "x"));
    }

    [Fact]
    public void MinimizeMovement_True_ShouldStayOnCurrentIfMultipleMatches ()
    {
        var strings = new [] { "$$", "$100.00", "$101.00", "$101.10", "$200.00", "apricot", "c", "car", "cart" };
        var current = 0;
        var n = new CollectionNavigator (strings);
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, "$$", true));
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, "$", true));
        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, "$$", true)); // back to top
        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, "$1", true));
        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, "$", true));
        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, "$", true));

        Assert.Equal (strings.IndexOf ("car"), current = n.GetNextMatchingItem (current, "car", true));
        Assert.Equal (strings.IndexOf ("car"), current = n.GetNextMatchingItem (current, "car", true));

        Assert.Equal (-1, current = n.GetNextMatchingItem (current, "x", true));
    }

    [Fact]
    public void MutliKeySearchPlusWrongKeyStays ()
    {
        var strings = new [] { "a", "c", "can", "candle", "candy", "yellow", "zebra" };
        var current = 0;
        var n = new CollectionNavigator (strings);

        // https://github.com/gui-cs/Terminal.Gui/pull/2132#issuecomment-1298425573
        // One thing that it currently does that is different from Explorer is that as soon as you hit a wrong key then it jumps to that index.
        // So if you type cand then z it jumps you to something beginning with z. In the same situation Windows Explorer beeps (not the best!)
        // but remains on candle.
        // We might be able to update the behaviour so that a 'wrong' keypress (z) within 500ms of a 'right' keypress ("can" + 'd') is
        // simply ignored (possibly ending the search process though). That would give a short delay for user to realise the thing
        // they typed doesn't exist and then start a new search (which would be possible 500ms after the last 'good' keypress).
        // This would only apply for 2+ character searches where theres been a successful 2+ character match right before.

        Assert.Equal (strings.IndexOf ("a"), current = n.GetNextMatchingItem (current, 'a'));
        Assert.Equal ("a", n.SearchString);
        Assert.Equal (strings.IndexOf ("c"), current = n.GetNextMatchingItem (current, 'c'));
        Assert.Equal ("c", n.SearchString);
        Assert.Equal (strings.IndexOf ("can"), current = n.GetNextMatchingItem (current, 'a'));
        Assert.Equal ("ca", n.SearchString);
        Assert.Equal (strings.IndexOf ("can"), current = n.GetNextMatchingItem (current, 'n'));
        Assert.Equal ("can", n.SearchString);
        Assert.Equal (strings.IndexOf ("candle"), current = n.GetNextMatchingItem (current, 'd'));
        Assert.Equal ("cand", n.SearchString);

        // Same as above, but with a 'wrong' key (z)
        Thread.Sleep (n.TypingDelay + 10);
        Assert.Equal (strings.IndexOf ("a"), current = n.GetNextMatchingItem (current, 'a'));
        Assert.Equal ("a", n.SearchString);
        Assert.Equal (strings.IndexOf ("c"), current = n.GetNextMatchingItem (current, 'c'));
        Assert.Equal ("c", n.SearchString);
        Assert.Equal (strings.IndexOf ("can"), current = n.GetNextMatchingItem (current, 'a'));
        Assert.Equal ("ca", n.SearchString);
        Assert.Equal (strings.IndexOf ("can"), current = n.GetNextMatchingItem (current, 'n'));
        Assert.Equal ("can", n.SearchString);
        Assert.Equal (strings.IndexOf ("can"), current = n.GetNextMatchingItem (current, 'z')); // Shouldn't move
        Assert.Equal ("can", n.SearchString); // Shouldn't change
    }

    [Fact]
    public void OutOfBoundsShouldBeIgnored ()
    {
        var n = new CollectionNavigator (simpleStrings);

        // Expect saying that index 500 is the current selection should not cause
        // error and just be ignored (treated as no selection)
        Assert.Equal (2, n.GetNextMatchingItem (500, 'b'));
    }

    [Fact]
    public void ShouldAcceptNegativeOne ()
    {
        var n = new CollectionNavigator (simpleStrings);

        // Expect that index of -1 (i.e. no selection) should work correctly
        // and select the first entry of the letter 'b'
        Assert.Equal (2, n.GetNextMatchingItem (-1, 'b'));
    }

    [Fact]
    public void Symbols ()
    {
        var strings = new [] { "$$", "$100.00", "$101.00", "$101.10", "$200.00", "apricot" };
        var current = 0;
        var n = new CollectionNavigator (strings);
        Assert.Equal (strings.IndexOf ("apricot"), current = n.GetNextMatchingItem (current, 'a'));
        Assert.Equal ("a", n.SearchString);

        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$", n.SearchString);

        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, '1'));
        Assert.Equal ("$1", n.SearchString);

        Assert.Equal (strings.IndexOf ("$100.00"), current = n.GetNextMatchingItem (current, '0'));
        Assert.Equal ("$10", n.SearchString);

        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, '1'));
        Assert.Equal ("$101", n.SearchString);

        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, '.'));
        Assert.Equal ("$101.", n.SearchString);

        // stay on the same item becuase still in timedelay
        Assert.Equal (strings.IndexOf ("$101.00"), current = n.GetNextMatchingItem (current, 'a'));
        Assert.Equal ("$101.", n.SearchString);

        Thread.Sleep (n.TypingDelay + 100);

        // another '$' means searching for "$" again
        Assert.Equal (strings.IndexOf ("$101.10"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$", n.SearchString);

        Assert.Equal (strings.IndexOf ("$$"), current = n.GetNextMatchingItem (current, '$'));
        Assert.Equal ("$$", n.SearchString);
    }

    [Fact]
    public void Unicode ()
    {
        var strings = new [] { "apricot", "arm", "ta", "丗丙业丞", "丗丙丛", "text", "egg", "candle" };

        var n = new CollectionNavigator (strings);
        var current = 0;
        Assert.Equal (strings.IndexOf ("丗丙业丞"), current = n.GetNextMatchingItem (current, '丗'));

        // 丗丙业丞 is as good a match as 丗丙丛
        // so when doing multi character searches we should
        // prefer to stay on the same index unless we invalidate
        // our typed text
        Assert.Equal (strings.IndexOf ("丗丙业丞"), current = n.GetNextMatchingItem (current, '丙'));

        // No longer matches 丗丙业丞 and now only matches 丗丙丛
        // so we should move to the new match
        Assert.Equal (strings.IndexOf ("丗丙丛"), current = n.GetNextMatchingItem (current, '丛'));

        // nothing starts "丗丙丛a". Since were still in the timedelay we do not jump to apricot
        Assert.Equal (strings.IndexOf ("丗丙丛"), current = n.GetNextMatchingItem (current, 'a'));

        Thread.Sleep (n.TypingDelay + 100);

        // nothing starts "丗丙丛a". Since were past timedelay we DO jump to apricot
        Assert.Equal (strings.IndexOf ("apricot"), current = n.GetNextMatchingItem (current, 'a'));
    }

    [Fact]
    public void Word ()
    {
        var strings = new [] { "apricot", "arm", "bat", "batman", "bates hotel", "candle" };
        var current = 0;
        var n = new CollectionNavigator (strings);
        Assert.Equal (strings.IndexOf ("bat"), current = n.GetNextMatchingItem (current, 'b')); // match bat
        Assert.Equal (strings.IndexOf ("bat"), current = n.GetNextMatchingItem (current, 'a')); // match bat
        Assert.Equal (strings.IndexOf ("bat"), current = n.GetNextMatchingItem (current, 't')); // match bat

        Assert.Equal (
                      strings.IndexOf ("bates hotel"),
                      current = n.GetNextMatchingItem (current, 'e')
                     ); // match bates hotel

        Assert.Equal (
                      strings.IndexOf ("bates hotel"),
                      current = n.GetNextMatchingItem (current, 's')
                     ); // match bates hotel

        Assert.Equal (
                      strings.IndexOf ("bates hotel"),
                      current = n.GetNextMatchingItem (current, ' ')
                     ); // match bates hotel
    }
    [Fact]
    public void CustomMatcher_NeverMatches ()
    {
        var strings = new [] { "apricot", "arm", "bat", "batman", "bates hotel", "candle" };
        var current = 0;
        var n = new CollectionNavigator (strings);

        var matchNone = new Mock<ICollectionNavigatorMatcher> ();

        matchNone.Setup (m => m.IsMatch (It.IsAny<string> (), It.IsAny<object> ()))
                 .Returns (false);

        n.Matcher = matchNone.Object;

        Assert.Equal (0, current = n.GetNextMatchingItem (current, 'b')); // no matches
        Assert.Equal (0, current = n.GetNextMatchingItem (current, 'a')); // no matches
        Assert.Equal (0, current = n.GetNextMatchingItem (current, 't')); // no matches
    }
}
