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legato-demo
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"""ABC notation utilities: MusicXML conversion and HTML visualization."""
import html as html_module
import json
import os
import subprocess
import tempfile

from config import ABC2XML_PATH, APP_DIR

def abc_to_musicxml_file(abc: str):
    """Convert ABC to MusicXML using abc2xml.py; return file path for download or None."""
    if not (abc or "").strip():
        return None
    try:
        result = subprocess.run(
            [os.environ.get("PYTHON", "python"), ABC2XML_PATH, "-"],
            input=(abc or "").strip().encode("utf-8"),
            capture_output=True,
            cwd=APP_DIR,
            timeout=30,
        )
        if result.returncode != 0 or not result.stdout:
            return None
        xml_bytes = result.stdout
        if isinstance(xml_bytes, bytes):
            xml_str = xml_bytes.decode("utf-8", errors="replace")
        else:
            xml_str = xml_bytes
        tmpdir = tempfile.mkdtemp(prefix="musicxml_")
        score_path = os.path.join(tmpdir, "score.musicxml")
        try:
            with open(score_path, "w", encoding="utf-8") as f:
                f.write(xml_str)
            return score_path
        except Exception:
            try:
                os.unlink(score_path)
            except Exception:
                pass
            try:
                os.rmdir(tmpdir)
            except Exception:
                pass
            return None
    except Exception:
        return None


def abc_viz_html(abc: str) -> str:
    """Generate HTML with ABCJS for rendering ABC notation in Gradio."""
    viz_abc = abc or ""
    data_attr = html_module.escape(json.dumps(viz_abc), quote=True)
    # Gradio strips <script> in gr.HTML; use iframe srcdoc so ABCJS runs inside the frame.
    inner = (
        '<!DOCTYPE html><html><head><meta charset="utf-8">'
        '<style>body{overflow:auto;margin:0;} #abc-viz{width:100%;}</style></head><body>'
        '<div id="abc-viz" data-abc="' + data_attr + '"></div>'
        '<script src="https://cdnjs.cloudflare.com/ajax/libs/abcjs/6.4.0/abcjs-basic-min.js"><\x2fscript>'
        '<script>'
        '(function(){ var el=document.getElementById("abc-viz"); if(!el) return; '
        'var run=function(){ try { var abc=JSON.parse(el.getAttribute("data-abc")); '
        'if(typeof ABCJS!=="undefined"&&abc) ABCJS.renderAbc("abc-viz",abc,{responsive:"resize"}); } catch(e){ el.innerHTML="<span>Invalid ABC</span>"; } }; '
        'if(typeof ABCJS!=="undefined") run(); else { var s=document.createElement("script"); '
        's.src="https://cdnjs.cloudflare.com/ajax/libs/abcjs/6.4.0/abcjs-basic-min.js"; s.onload=run; document.head.appendChild(s); } })();'
        '<\x2fscript></body></html>'
    )
    srcdoc_escaped = inner.replace("&", "&amp;").replace('"', "&quot;")
    return '<iframe sandbox="allow-scripts" title="ABC notation" style="width:100%;height:60vh;max-height:400px;display:block;" srcdoc="' + srcdoc_escaped + '"></iframe>'