using JournalBot.Shared;
using Xunit;

public class RuntimeReaderTests
{
    private static string MakeRuntime()
    {
        var root = Path.Combine(Path.GetTempPath(), "jb_test_" + Guid.NewGuid().ToString("N"));
        foreach (var sub in new[] { "queue/pending", "queue/done", "queue/failed", "logs" })
            Directory.CreateDirectory(Path.Combine(root, sub));
        return root;
    }

    [Fact]
    public void ReadHistory_parsesDoneItemsNewestFirst()
    {
        var root = MakeRuntime();
        var done = Path.Combine(root, "queue", "done");
        File.WriteAllText(Path.Combine(done, "1.json"),
            "{\"update_id\":1,\"received_at\":\"2026-06-14T10:00:00+02:00\",\"type\":\"text\",\"text\":\"a\",\"target_path\":\"05 Daily Notes/2026-06-14.md\",\"processed_at\":\"2026-06-14T11:00:00+02:00\"}");
        File.WriteAllText(Path.Combine(done, "2.json"),
            "{\"update_id\":2,\"received_at\":\"2026-06-14T12:00:00+02:00\",\"type\":\"voice\",\"text\":\"b\",\"processed_at\":\"2026-06-14T13:00:00+02:00\"}");

        var reader = new RuntimeReader(root);
        var history = reader.ReadHistory();

        Assert.Equal(2, history.Count);
        Assert.Equal(2, history[0].UpdateId); // newest processed_at first
        Assert.Equal("05 Daily Notes/2026-06-14.md", history[1].TargetPath);
    }

    [Fact]
    public void ReadHistory_readsUmlautsAsUtf8()
    {
        var root = MakeRuntime();
        var done = Path.Combine(root, "queue", "done");
        // Python writes done items as UTF-8; read-back must not mangle umlauts.
        File.WriteAllText(Path.Combine(done, "1.json"),
            "{\"update_id\":1,\"received_at\":\"2026-06-14T10:00:00+02:00\",\"type\":\"text\",\"text\":\"Geburtstagsfeier für Jörg\",\"processed_at\":\"2026-06-14T11:00:00+02:00\"}",
            System.Text.Encoding.UTF8);

        var history = new RuntimeReader(root).ReadHistory();

        Assert.Single(history);
        Assert.Equal("Geburtstagsfeier für Jörg", history[0].Text);
    }

    [Fact]
    public void TailLog_readsUmlautsAsUtf8()
    {
        var root = MakeRuntime();
        File.WriteAllText(Path.Combine(root, "logs", "service.log"),
            "Klärung: Eintrag geschrieben für Jörg", System.Text.Encoding.UTF8);

        var lines = new RuntimeReader(root).TailLog("service.log", 5);

        Assert.Equal("Klärung: Eintrag geschrieben für Jörg", lines[^1]);
    }

    [Fact]
    public void ReadStatus_countsPendingAndFailed()
    {
        var root = MakeRuntime();
        File.WriteAllText(Path.Combine(root, "queue", "pending", "1.json"), "{}");
        File.WriteAllText(Path.Combine(root, "queue", "pending", "2.json"), "{}");
        File.WriteAllText(Path.Combine(root, "queue", "failed", "3.json"), "{}");

        var status = new RuntimeReader(root).ReadStatus();

        Assert.Equal(2, status.Pending);
        Assert.Equal(1, status.Failed);
    }

    [Fact]
    public void TailLog_returnsLastLines()
    {
        var root = MakeRuntime();
        File.WriteAllText(Path.Combine(root, "logs", "service.log"),
            string.Join("\n", Enumerable.Range(1, 100).Select(i => $"line {i}")));

        var lines = new RuntimeReader(root).TailLog("service.log", 5);

        Assert.Equal(5, lines.Count);
        Assert.Equal("line 100", lines[^1]);
    }
}