using Xunit;
using NozCli.Core.Client;

namespace NozCli.Tests;

public class NoteLinkHelperTests
{
    // ── AddLink — neue Sektion ────────────────────────────────────────────────

    [Fact]
    public void AddLink_NoSection_AppendsSieheAuch()
    {
        var md     = "# Notiz\n\nEtwas Text.";
        var result = NoteLinkHelper.AddLink(md, "psychologie/flow");

        Assert.Contains("## Siehe auch", result);
        Assert.Contains("- [[psychologie/flow]]", result);
    }

    [Fact]
    public void AddLink_NoSection_BodyUntouched()
    {
        var md     = "# Notiz\n\nEtwas Text.";
        var result = NoteLinkHelper.AddLink(md, "psychologie/flow");

        Assert.StartsWith("# Notiz\n\nEtwas Text.", result);
    }

    // ── AddLink — existierende Sektion ────────────────────────────────────────

    [Fact]
    public void AddLink_ExistingSection_AppendsToSection()
    {
        var md = "# Notiz\n\nText.\n\n## Siehe auch\n\n- [[anderes/link]]\n";
        var result = NoteLinkHelper.AddLink(md, "psychologie/flow");

        Assert.Contains("- [[anderes/link]]", result);
        Assert.Contains("- [[psychologie/flow]]", result);
    }

    [Fact]
    public void AddLink_AlreadyLinked_NoChange()
    {
        var md     = "# Notiz\n\n## Siehe auch\n\n- [[psychologie/flow]]\n";
        var result = NoteLinkHelper.AddLink(md, "psychologie/flow");

        Assert.Equal(md, result);
    }

    [Fact]
    public void AddLink_ExistingSection_DoesNotBleedIntoNextSection()
    {
        var md = "# Notiz\n\n## Siehe auch\n\n- [[a]]\n\n## Weiteres\n\nAnderer Inhalt.\n";
        var result = NoteLinkHelper.AddLink(md, "b/new-note");

        Assert.Contains("- [[b/new-note]]", result);
        // The new link should appear before "## Weiteres"
        var linkIdx    = result.IndexOf("- [[b/new-note]]", StringComparison.Ordinal);
        var weitersIdx = result.IndexOf("## Weiteres",      StringComparison.Ordinal);
        Assert.True(linkIdx < weitersIdx);
    }

    // ── ApplyPlaceholders ─────────────────────────────────────────────────────

    [Fact]
    public void ApplyPlaceholders_ReplacesAllTokens()
    {
        var body   = "# {{title}}\n\ntopic: {{topic}}\nlang: {{lang}}\nstatus: {{status}}";
        var result = NoteLinkHelper.ApplyPlaceholders(body, "Mein Rezept", "kochen", "de", "seed");

        Assert.Contains("# Mein Rezept", result);
        Assert.Contains("topic: kochen", result);
        Assert.Contains("lang: de", result);
        Assert.Contains("status: seed", result);
        Assert.DoesNotContain("{{", result);
    }

    [Fact]
    public void ApplyPlaceholders_DateIsCurrentDay()
    {
        var body   = "Datum: {{date}}";
        var result = NoteLinkHelper.ApplyPlaceholders(body, "", "", "", "");
        var today  = DateTime.UtcNow.ToString("yyyy-MM-dd");
        Assert.Contains(today, result);
    }
}