using ClaudeDo.Data;
using Xunit;

namespace ClaudeDo.Data.Tests;

public class TaskPromptComposerTests
{
    [Fact]
    public void Composes_title_description_and_open_steps()
    {
        var result = TaskPromptComposer.Compose(
            "Refactor diff viewer",
            "Share the row template.",
            new (string, bool)[] { ("Done step", true), ("Open step", false) });

        Assert.Equal(
            "Refactor diff viewer\n\nShare the row template.\n\n## Sub-Tasks\n- [ ] Open step\n",
            result);
    }

    [Fact]
    public void Drops_resolved_steps_and_omits_section_when_none_open()
    {
        var result = TaskPromptComposer.Compose(
            "Title",
            "Desc",
            new (string, bool)[] { ("a", true), ("b", true) });

        Assert.Equal("Title\n\nDesc", result);
    }

    [Fact]
    public void Omits_description_when_blank()
    {
        var result = TaskPromptComposer.Compose("Title", "   ", new (string, bool)[] { ("open", false) });

        Assert.Equal("Title\n\n## Sub-Tasks\n- [ ] open\n", result);
    }

    [Fact]
    public void Title_only_when_no_description_or_steps()
    {
        Assert.Equal("Just a title", TaskPromptComposer.Compose("Just a title", null, System.Array.Empty<(string, bool)>()));
    }

    [Fact]
    public void Attachment_section_present_when_paths_given()
    {
        var result = TaskPromptComposer.Compose(
            "Title", null, System.Array.Empty<(string, bool)>(),
            new[] { "/a/b/file1.txt", "/a/b/file2.txt" });

        Assert.Contains("## Reference files", result);
        Assert.Contains("- /a/b/file1.txt", result);
        Assert.Contains("- /a/b/file2.txt", result);
    }

    [Fact]
    public void Attachment_section_absent_when_null()
    {
        var result = TaskPromptComposer.Compose("Title", null, System.Array.Empty<(string, bool)>(), null);
        Assert.DoesNotContain("Reference files", result);
    }

    [Fact]
    public void Attachment_section_absent_when_empty()
    {
        var result = TaskPromptComposer.Compose("Title", null, System.Array.Empty<(string, bool)>(),
            System.Array.Empty<string>());
        Assert.DoesNotContain("Reference files", result);
    }

    [Fact]
    public void Attachment_paths_order_preserved()
    {
        var paths = new[] { "/z/last.txt", "/a/first.txt", "/m/middle.txt" };
        var result = TaskPromptComposer.Compose("Title", null, System.Array.Empty<(string, bool)>(), paths);

        var idxZ = result.IndexOf("/z/last.txt", StringComparison.Ordinal);
        var idxA = result.IndexOf("/a/first.txt", StringComparison.Ordinal);
        var idxM = result.IndexOf("/m/middle.txt", StringComparison.Ordinal);

        Assert.True(idxZ < idxA && idxA < idxM, "Paths should appear in the original order.");
    }
}