using EnvelopeRenderer.Desktop.Core.Design;

namespace EnvelopeRenderer.Desktop.Tests;

public class AddressLineCollapserTests
{
    [Fact]
    public void Resolve_NoLineCollapses_EveryLineVisibleAtOriginalY()
    {
        var lines = new[]
        {
            new AddressLineCollapser.Line(100, 300, false),
            new AddressLineCollapser.Line(100, 285, false),
        };

        var resolved = AddressLineCollapser.Resolve(lines);

        Assert.All(resolved, r => Assert.True(r.Visible));
        Assert.Equal(300, resolved[0].EffectiveY, precision: 6);
        Assert.Equal(285, resolved[1].EffectiveY, precision: 6);
    }

    [Fact]
    public void Resolve_SingleBlankLine_SubsequentLineShiftsUpByItsRowHeight()
    {
        var lines = new[]
        {
            new AddressLineCollapser.Line(100, 300, false),
            new AddressLineCollapser.Line(100, 285, true),
            new AddressLineCollapser.Line(100, 270, false),
        };

        var resolved = AddressLineCollapser.Resolve(lines);

        Assert.True(resolved[0].Visible);
        Assert.False(resolved[1].Visible);
        Assert.True(resolved[2].Visible);
        Assert.Equal(285, resolved[2].EffectiveY, precision: 6);
    }

    [Fact]
    public void Resolve_MultipleConsecutiveBlankLines_CollapseWithoutLeavingExtraGaps()
    {
        var lines = new[]
        {
            new AddressLineCollapser.Line(100, 300, false),
            new AddressLineCollapser.Line(100, 285, true),
            new AddressLineCollapser.Line(100, 270, true),
            new AddressLineCollapser.Line(100, 255, false),
        };

        var resolved = AddressLineCollapser.Resolve(lines);

        Assert.False(resolved[1].Visible);
        Assert.False(resolved[2].Visible);
        Assert.True(resolved[3].Visible);
        Assert.Equal(285, resolved[3].EffectiveY, precision: 6);
    }

    [Fact]
    public void Resolve_LinesAtDifferentX_DoNotAffectEachOther()
    {
        var lines = new[]
        {
            new AddressLineCollapser.Line(100, 300, false),
            new AddressLineCollapser.Line(100, 285, true),
            new AddressLineCollapser.Line(400, 300, false),
            new AddressLineCollapser.Line(400, 285, false),
        };

        var resolved = AddressLineCollapser.Resolve(lines);

        Assert.False(resolved[1].Visible);
        Assert.True(resolved[3].Visible);
        Assert.Equal(285, resolved[3].EffectiveY, precision: 6);
    }

    [Fact]
    public void Resolve_LastLineBlank_IsANoOp()
    {
        var lines = new[]
        {
            new AddressLineCollapser.Line(100, 300, false),
            new AddressLineCollapser.Line(100, 285, true),
        };

        var resolved = AddressLineCollapser.Resolve(lines);

        Assert.True(resolved[0].Visible);
        Assert.False(resolved[1].Visible);
    }
}