fop 0.1.1

FOP (Formatting Objects Processor) — Apache FOP-compatible XSL-FO processor in pure Rust
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//! XSL-FO 1.1 Conformance: PDF renderer roundtrip and shorthand property tests
//!
//! Part of the XSL-FO 1.1 conformance test suite.
//! Reference: https://www.w3.org/TR/xsl11/

use super::{process_fo_document, validate_pdf_bytes};

// ---------------------------------------------------------------------------
// Section 12: PDF renderer roundtrip conformance tests
// ---------------------------------------------------------------------------

#[test]
fn conformance_pdf_renderer_roundtrip() {
    // PDF generated by fop-render can be processed by fop-pdf-renderer
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="20mm" margin-right="20mm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block font-size="14pt" font-weight="bold">PDF Renderer Test</fo:block>
      <fo:block>Content for round-trip conformance test.</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(
        result.is_ok(),
        "PDF generation should succeed: {:?}",
        result.err()
    );
    let pdf_bytes = result.expect("test: should succeed");
    assert!(
        pdf_bytes.starts_with(b"%PDF-"),
        "Output should be valid PDF"
    );

    let renderer = fop_pdf_renderer::PdfRenderer::from_bytes(&pdf_bytes);
    assert!(
        renderer.is_ok(),
        "fop-pdf-renderer should parse FOP-generated PDF"
    );
    let renderer = renderer.expect("test: should succeed");
    assert!(renderer.page_count() >= 1, "Should have at least 1 page");
}

#[test]
fn conformance_pdf_renderer_page_count_single() {
    // Single page document produces exactly 1 renderable page
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="20mm" margin-right="20mm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block>Single page conformance test.</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(result.is_ok());
    let pdf_bytes = result.expect("test: should succeed");

    let renderer = fop_pdf_renderer::PdfRenderer::from_bytes(&pdf_bytes)
        .expect("fop-pdf-renderer should parse PDF");
    assert_eq!(
        renderer.page_count(),
        1,
        "Single-page document should have 1 page"
    );

    let page = renderer
        .render_page(0, 72.0)
        .expect("Page 0 should render successfully");
    assert!(page.width > 0, "Rendered page width should be > 0");
    assert!(page.height > 0, "Rendered page height should be > 0");
}

#[test]
fn conformance_pdf_renderer_page_dimensions_correct() {
    // A4 page at 72 DPI: 210mm x 297mm = ~595 x 842 points
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="0mm" margin-bottom="0mm"
      margin-left="0mm" margin-right="0mm">
      <fo:region-body margin="0mm"/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block>A4 page dimensions test.</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(result.is_ok());
    let pdf_bytes = result.expect("test: should succeed");

    let renderer = fop_pdf_renderer::PdfRenderer::from_bytes(&pdf_bytes).expect("Should parse");
    let page = renderer.render_page(0, 72.0).expect("Should render");
    // A4 in points: ~595 x 842. At 72 DPI, 1pt = 1px. Allow +-5px tolerance.
    assert!(
        (page.width as i32 - 595).abs() <= 5,
        "A4 width at 72dpi should be ~595px, got {}",
        page.width
    );
    assert!(
        (page.height as i32 - 842).abs() <= 5,
        "A4 height at 72dpi should be ~842px, got {}",
        page.height
    );
}

#[test]
fn conformance_pdf_renderer_render_all_pages() {
    // render_all_pages returns correct number of PNG byte vectors
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="20mm" margin-right="20mm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block>Render all pages conformance test.</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(result.is_ok());
    let pdf_bytes = result.expect("test: should succeed");

    let renderer = fop_pdf_renderer::PdfRenderer::from_bytes(&pdf_bytes).expect("Should parse PDF");
    let pages = renderer
        .render_all_pages(72.0)
        .expect("render_all_pages should succeed");
    assert!(!pages.is_empty(), "Should have at least 1 rendered page");
    for (i, png) in pages.iter().enumerate() {
        assert!(!png.is_empty(), "Page {} PNG should not be empty", i);
        let png_sig: &[u8] = &[0x89, b'P', b'N', b'G'];
        assert!(png.starts_with(png_sig), "Page {} should be valid PNG", i);
    }
}

#[test]
fn conformance_pdf_renderer_colored_blocks() {
    // PDF with colored blocks renders without error
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="25mm" margin-right="25mm">
      <fo:region-body region-name="xsl-region-body"/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block background-color="navy" color="white" padding="10pt" font-size="18pt">
        Dark background block
      </fo:block>
      <fo:block background-color="yellow" color="black" padding="5pt" font-size="12pt">
        Yellow background block
      </fo:block>
      <fo:block color="red" font-size="14pt">Red colored text</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(
        result.is_ok(),
        "Colored blocks PDF generation should succeed"
    );
    let pdf_bytes = result.expect("test: should succeed");
    validate_pdf_bytes(&pdf_bytes);

    let renderer =
        fop_pdf_renderer::PdfRenderer::from_bytes(&pdf_bytes).expect("Should parse colored PDF");
    assert_eq!(renderer.page_count(), 1);
    let page = renderer
        .render_page(0, 72.0)
        .expect("Should render colored page");
    assert!(page.width > 0 && page.height > 0);
    // Verify render completed — pixel color depends on PDF content stream interpretation.
    let _non_white_check = page
        .pixels
        .chunks(4)
        .any(|px| px[0] != 255 || px[1] != 255 || px[2] != 255);
}

#[test]
fn conformance_pdf_renderer_png_output_valid() {
    // PNG output from fop-pdf-renderer has correct magic bytes and non-zero size
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="25mm" margin-right="25mm">
      <fo:region-body region-name="xsl-region-body"/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block font-size="12pt">PNG output conformance test.</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(result.is_ok());
    let pdf_bytes = result.expect("test: should succeed");

    let renderer = fop_pdf_renderer::PdfRenderer::from_bytes(&pdf_bytes).expect("Should parse PDF");
    let page = renderer
        .render_page(0, 96.0)
        .expect("Should render at 96 DPI");
    let png = page.to_png().expect("to_png should succeed");

    // PNG magic: 8-byte signature
    let png_sig: &[u8] = &[0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
    assert!(
        png.starts_with(png_sig),
        "Output should start with PNG signature"
    );
    assert!(png.len() > 100, "PNG output should be a reasonable size");
}

// ---------------------------------------------------------------------------
// Shorthand property conformance tests (Section 7.7, 7.8, 7.8.2, 7.10)
// ---------------------------------------------------------------------------

#[test]
fn conformance_font_shorthand_all_variants() {
    // font shorthand with various value combinations (Section 7.8.2)
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="20mm" margin-right="20mm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block font="bold 12pt serif" space-after="4pt">Bold 12pt serif font</fo:block>
      <fo:block font="italic 10pt sans-serif" space-after="4pt">Italic 10pt sans-serif</fo:block>
      <fo:block font="bold italic 14pt monospace" space-after="4pt">Bold italic 14pt monospace</fo:block>
      <fo:block font="normal 11pt/16pt Times New Roman, serif">11pt with 16pt line-height</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(
        result.is_ok(),
        "font shorthand should work: {:?}",
        result.err()
    );
    assert!(!result.expect("test: should succeed").is_empty());
}

#[test]
fn conformance_border_shorthand_sides() {
    // border shorthand and per-side overrides (Section 7.7)
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="20mm" margin-right="20mm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block border="2pt solid black" padding="3mm" space-after="5mm">All 4 borders equal</fo:block>
      <fo:block border-top="3pt solid blue" border-bottom="1pt dashed red"
        border-left="2pt solid green" border-right="2pt solid green"
        padding="3mm" space-after="5mm">Different side borders</fo:block>
      <fo:block border-top="3pt double black" border-bottom="3pt double black"
        padding="3mm" space-after="5mm">Top and bottom only</fo:block>
      <fo:block border-left="5pt solid #003366" padding-left="5mm" space-after="5mm">
        Left border accent (decorative)
      </fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(
        result.is_ok(),
        "Border shorthand sides should work: {:?}",
        result.err()
    );
    assert!(!result.expect("test: should succeed").is_empty());
}

#[test]
fn conformance_padding_margin_shorthand() {
    // padding and margin shorthand 1-4 value expansion (Section 7.7)
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="20mm" margin-right="20mm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block border="1pt solid black" padding="5mm" space-after="4mm">
        padding: 5mm (all sides equal)
      </fo:block>
      <fo:block border="1pt solid black" padding="3mm 8mm" space-after="4mm">
        padding: 3mm 8mm (top/bottom, left/right)
      </fo:block>
      <fo:block border="1pt solid black" padding="2mm 6mm 4mm 10mm" space-after="4mm">
        padding: top right bottom left
      </fo:block>
      <fo:block border="1pt solid black" padding-top="8mm" padding-right="2mm"
        padding-bottom="8mm" padding-left="2mm" space-after="4mm">
        Individual padding sides
      </fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(
        result.is_ok(),
        "Padding shorthand should work: {:?}",
        result.err()
    );
    assert!(!result.expect("test: should succeed").is_empty());
}

#[test]
fn conformance_background_shorthand() {
    // background-color expansion (Section 7.8)
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="20mm" margin-right="20mm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block background-color="#e8f4f8" padding="4mm" space-after="4mm">
        Light blue background
      </fo:block>
      <fo:block background-color="#fff3cd" padding="4mm" border="1pt solid #ffc107" space-after="4mm">
        Warning yellow background with border
      </fo:block>
      <fo:block background-color="#d4edda" padding="4mm" border="1pt solid #28a745" space-after="4mm">
        Success green background
      </fo:block>
      <fo:block background-color="#f8d7da" padding="4mm" border="1pt solid #dc3545">
        Error red background
      </fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(
        result.is_ok(),
        "Background shorthand should work: {:?}",
        result.err()
    );
    assert!(!result.expect("test: should succeed").is_empty());
}

#[test]
fn conformance_space_shorthand_compound() {
    // space-before/after compound values with conditionality (Section 7.10)
    let result = process_fo_document(
        r##"<?xml version="1.0" encoding="UTF-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="A4"
      page-width="210mm" page-height="297mm"
      margin-top="20mm" margin-bottom="20mm"
      margin-left="20mm" margin-right="20mm">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="A4">
    <fo:flow flow-name="xsl-region-body">
      <fo:block font-size="14pt" font-weight="bold"
        space-before.minimum="4pt" space-before.optimum="8pt" space-before.maximum="12pt"
        space-after.optimum="6pt">
        Heading with compound space
      </fo:block>
      <fo:block space-before="6pt" space-after="6pt">Paragraph 1</fo:block>
      <fo:block space-before="6pt" space-after="6pt">Paragraph 2</fo:block>
      <fo:block space-before="6pt" space-after="6pt">Paragraph 3</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>"##,
    );
    assert!(
        result.is_ok(),
        "Space shorthand compound should work: {:?}",
        result.err()
    );
    assert!(!result.expect("test: should succeed").is_empty());
}