internal static partial class Program
{
    static Task TestParserExtractsBoldDateAsync()
    {
        var content = """
    ---
    type: journal
    ---
    **Date:** 2026-02-22
    ## Summary
    hello
    """;

        var entry = JournalParser.ParseJournalContent(content, "2026-02-01");
        Assert(entry.Date == "2026-02-22", "Parser should read date from **Date:** marker.");
        return Task.CompletedTask;
    }

    static Task TestParserExtractsPlainDateAsync()
    {
        var content = """
    Date: 2026-02-23
    ## Summary
    hello
    """;

        var entry = JournalParser.ParseJournalContent(content, "2026-02-01");
        Assert(entry.Date == "2026-02-23", "Parser should read date from Date: marker.");
        return Task.CompletedTask;
    }

    static Task TestParserFallsBackToFileStemAsync()
    {
        var content = """
    ## Summary
    no explicit date
    """;

        var entry = JournalParser.ParseJournalContent(content, "2026-02-24");
        Assert(entry.Date == "2026-02-24", "Parser should fall back to file stem when no date marker is present.");
        return Task.CompletedTask;
    }

    static Task TestParserCapturesSectionsAsync()
    {
        var content = """
    Date: 2026-02-25
    ## Summary
    line one
    line two
    ### Events / Triggers - Work
    trigger line
    ## reflection notes
    anchor line
    """;

        var entry = JournalParser.ParseJournalContent(content, "2026-02-01");

        Assert(entry.Sections.ContainsKey("Summary"), "Parser should capture Summary section.");
        Assert(entry.Sections.ContainsKey("Events / Triggers"), "Parser should capture Events / Triggers section.");
        Assert(entry.Sections.ContainsKey("Reflection"), "Parser should match canonical section title by substring.");
        Assert(entry.GetSection("Summary").Contains("line one"), "Summary section content mismatch.");
        Assert(entry.GetSection("Events / Triggers").Contains("trigger line"), "Events / Triggers section content mismatch.");
        Assert(entry.GetSection("Reflection").Contains("anchor line"), "Reflection section content mismatch.");

        return Task.CompletedTask;
    }

    static Task TestParserIgnoresNonCanonicalHeadersAsync()
    {
        var content = """
    ## Summary
    keep this
    ## Totally Custom Header
    should not be captured
    ### Events / Triggers
    keep this too
    """;

        var entry = JournalParser.ParseJournalContent(content, "2026-02-01");

        Assert(entry.GetSection("Summary").Contains("keep this"), "Summary section should be captured.");
        Assert(!entry.GetSection("Summary").Contains("should not be captured"), "Non-canonical section content should not bleed into previous section.");
        Assert(entry.GetSection("Events / Triggers").Contains("keep this too"), "Canonical section after custom header should be captured.");

        return Task.CompletedTask;
    }

    static Task TestParserCapturesCheckboxStatesAsync()
    {
        var content = """
    ## Summary
    - [x] took medication
    - [ ] drank water
    * [X] wrote reflection
    ## Events / Triggers
    - [ ] talked to manager
    """;

        var entry = JournalParser.ParseJournalContent(content, "2026-02-01");

        Assert(entry.GetCheckboxState("Summary", "took medication") is true, "Expected checked state for '- [x]' checkbox.");
        Assert(entry.GetCheckboxState("Summary", "drank water") is false, "Expected unchecked state for '- [ ]' checkbox.");
        Assert(entry.GetCheckboxState("Summary", "wrote reflection") is true, "Expected checked state for '* [X]' checkbox.");
        Assert(entry.GetCheckboxState("Events / Triggers", "talked to manager") is false, "Expected unchecked state in Events / Triggers section.");
        Assert(entry.GetCheckboxState("Summary", "missing item") is null, "Missing checkbox text should return null.");

        return Task.CompletedTask;
    }

    static Task TestParserCapturesMultilineFragmentsAsync()
    {
        var content = """
    Date: 2026-02-26
    ## Summary
    text
    !TRIGGER @2026-02-26T10:15:00Z #stress #body
    first line
    second line
    !NOTE #daily
    short note
    """;

        var entry = JournalParser.ParseJournalContent(content, "2026-02-01");

        Assert(entry.Fragments.Count == 2, "Expected two parsed fragments.");
        Assert(entry.Fragments[0].Type == "!TRIGGER", "First fragment type mismatch.");
        Assert(entry.Fragments[0].Description == "first line\nsecond line", "First fragment multiline description mismatch.");
        Assert(entry.Fragments[0].Tags.Count == 2, "First fragment tag count mismatch.");
        Assert(entry.Fragments[0].Tags[0] == "stress" && entry.Fragments[0].Tags[1] == "body", "First fragment tags mismatch.");
        Assert(entry.Fragments[1].Type == "!NOTE", "Second fragment type mismatch.");
        Assert(entry.Fragments[1].Description == "short note", "Second fragment description mismatch.");
        Assert(entry.Fragments[1].Tags.Count == 1 && entry.Fragments[1].Tags[0] == "daily", "Second fragment tags mismatch.");

        return Task.CompletedTask;
    }

    static Task TestParserFragmentBoundaryBehaviorAsync()
    {
        var content = """
    !TRIGGER #a
    line one
    !NOTE this starts another fragment header
    line two
    """;

        var fragments = JournalParser.ParseFragments(content);
        Assert(fragments.Count == 1, "Expected one parsed fragment because second boundary line is not a valid fragment header.");
        Assert(fragments[0].Description == "line one", "First fragment boundary capture mismatch.");
        return Task.CompletedTask;
    }
}