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second-ear
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"""HTML rendering for the live meter strip and the finding cards.

Gradio's stock components can show a number. They cannot show a number
*against the window it is supposed to sit in*, which is the whole point of a
mix meter — so the bars are hand-rolled with the target range drawn as a
ghost behind the fill.
"""

from __future__ import annotations

import html

from . import dsp, knowledge

STYLE = """
<style>
.se-wrap{--se-bg:#101215;--se-panel:#171a1f;--se-line:#252a31;--se-dim:#7c8794;
 --se-text:#e6eaef;--se-ok:#4ec9a0;--se-note:#5aa7e0;--se-warn:#e0a44a;--se-crit:#e0574a;
 font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,monospace;
 background:var(--se-bg);border:1px solid var(--se-line);border-radius:10px;
 padding:16px 18px;color:var(--se-text);}
.se-verdict{display:flex;align-items:baseline;gap:12px;margin-bottom:14px;
 padding-bottom:12px;border-bottom:1px solid var(--se-line);}
.se-dot{width:9px;height:9px;border-radius:50%;flex:none;box-shadow:0 0 12px currentColor;}
.se-verdict-text{font-size:15px;letter-spacing:-0.01em;line-height:1.3;}
.se-verdict-sub{margin-left:auto;font-size:11px;color:var(--se-dim);white-space:nowrap;}
.se-nums{display:grid;grid-template-columns:repeat(auto-fit,minmax(88px,1fr));
 gap:1px;background:var(--se-line);border:1px solid var(--se-line);border-radius:6px;
 overflow:hidden;margin-bottom:16px;}
.se-num{background:var(--se-panel);padding:9px 11px;}
.se-num-k{font-size:9px;letter-spacing:0.09em;text-transform:uppercase;color:var(--se-dim);}
.se-num-v{font-size:17px;margin-top:3px;font-variant-numeric:tabular-nums;}
.se-bars{display:flex;flex-direction:column;gap:6px;}
.se-bar-row{display:grid;grid-template-columns:118px 1fr 54px;align-items:center;gap:10px;}
.se-bar-label{font-size:10px;color:var(--se-dim);letter-spacing:0.03em;}
.se-track{position:relative;height:16px;background:#0b0d10;border-radius:3px;overflow:hidden;}
.se-target{position:absolute;top:0;bottom:0;background:rgba(255,255,255,.07);
 border-left:1px solid rgba(255,255,255,.16);border-right:1px solid rgba(255,255,255,.16);}
.se-fill{position:absolute;top:3px;bottom:3px;left:0;border-radius:2px;
 transition:width 120ms linear;}
.se-bar-val{font-size:11px;text-align:right;font-variant-numeric:tabular-nums;color:var(--se-dim);}
.se-cards{display:flex;flex-direction:column;gap:9px;}
.se-card{background:var(--se-panel);border:1px solid var(--se-line);border-left-width:3px;
 border-radius:7px;padding:12px 14px;}
.se-card h4{margin:0 0 5px;font-size:13.5px;font-weight:600;letter-spacing:-0.01em;}
.se-card .ev{font-size:10.5px;color:var(--se-dim);margin-bottom:8px;
 font-variant-numeric:tabular-nums;}
.se-card p{margin:0 0 7px;font-size:12.5px;line-height:1.55;
 font-family:ui-sans-serif,system-ui,-apple-system,sans-serif;color:#c3cbd4;}
.se-card .move{font-size:12.5px;line-height:1.55;
 font-family:ui-sans-serif,system-ui,-apple-system,sans-serif;color:var(--se-text);
 border-top:1px dashed var(--se-line);padding-top:7px;}
.se-idle{color:var(--se-dim);font-size:12.5px;padding:26px 0;text-align:center;}
</style>
"""

_TONE = {"ok": "var(--se-ok)", "note": "var(--se-note)",
         "warn": "var(--se-warn)", "critical": "var(--se-crit)"}


def _pct(value: float, lo: float = -30.0, hi: float = 0.0) -> float:
    return max(0.0, min(100.0, (value - lo) / (hi - lo) * 100.0))


def _fmt(v: float, unit: str = "", digits: int = 1) -> str:
    if v is None or v != v or v <= -119:
        return "—"
    return f"{v:.{digits}f}{unit}"


def idle(message: str) -> str:
    return f'{STYLE}<div class="se-wrap"><div class="se-idle">{html.escape(message)}</div></div>'


def meters(rep: dsp.Report | None, genre: str, verdict: str, tone: str,
           extra: str = "") -> str:
    if rep is None:
        return idle("waiting for signal…")

    colour = _TONE.get(tone, "var(--se-dim)")
    windows = knowledge.band_target_windows(genre)

    nums = [
        ("LUFS-S", _fmt(rep.lufs_s)),
        ("True peak", _fmt(rep.true_peak, " dB", 2)),
        ("Crest", _fmt(rep.crest, " dB")),
        ("Corr", f"{rep.stereo.get('correlation', 0):+.2f}"),
        ("Sub corr", f"{rep.stereo.get('sub_correlation', 0):+.2f}"),
        ("Width", _fmt(rep.stereo.get("width_db", -99), " dB")),
    ]
    bpm = rep.rhythm.get("bpm", 0.0)
    if bpm > 0:
        nums.append(("Tempo", f"{bpm:.0f}"))
    key = rep.key.get("key", "—")
    if key and key != "—":
        nums.append(("Key", key))

    num_html = "".join(
        f'<div class="se-num"><div class="se-num-k">{html.escape(k)}</div>'
        f'<div class="se-num-v">{html.escape(v)}</div></div>'
        for k, v in nums
    )

    rows = []
    for band in dsp.BAND_ORDER:
        val = rep.bands.get(band, -60.0)
        lo, hi = windows.get(band, (-20.0, -4.0))
        inside = lo <= val <= hi
        fill = "var(--se-ok)" if inside else (
            "var(--se-warn)" if val > hi else "var(--se-note)")
        t_left, t_right = _pct(lo), _pct(hi)
        rows.append(
            f'<div class="se-bar-row">'
            f'<div class="se-bar-label">{html.escape(dsp.BAND_LABELS[band])}</div>'
            f'<div class="se-track">'
            f'<div class="se-target" style="left:{t_left:.1f}%;width:{max(t_right - t_left, 1):.1f}%"></div>'
            f'<div class="se-fill" style="width:{_pct(val):.1f}%;background:{fill}"></div>'
            f'</div>'
            f'<div class="se-bar-val">{val:+.1f}</div>'
            f'</div>'
        )

    sub = html.escape(extra) if extra else f"{rep.duration:.1f}s window · {html.escape(genre)}"

    return (
        f'{STYLE}<div class="se-wrap">'
        f'<div class="se-verdict">'
        f'<span class="se-dot" style="background:{colour};color:{colour}"></span>'
        f'<span class="se-verdict-text">{html.escape(verdict)}</span>'
        f'<span class="se-verdict-sub">{sub}</span>'
        f'</div>'
        f'<div class="se-nums">{num_html}</div>'
        f'<div class="se-bars">{"".join(rows)}</div>'
        f'</div>'
    )


def cards(diags: list[knowledge.Diagnosis], limit: int = 6) -> str:
    if not diags:
        return idle("no findings yet")
    out = []
    for d in diags[:limit]:
        colour = _TONE.get(d.severity, "var(--se-dim)")
        out.append(
            f'<div class="se-card" style="border-left-color:{colour}">'
            f'<h4 style="color:{colour}">{html.escape(d.headline)}</h4>'
            f'<div class="ev">{html.escape(d.evidence)}</div>'
            f'<p>{html.escape(d.why)}</p>'
            f'<div class="move"><b>Move:</b> {html.escape(d.move)}</div>'
            f'</div>'
        )
    return (f'{STYLE}<div class="se-wrap" style="background:transparent;border:none;padding:0">'
            f'<div class="se-cards">{"".join(out)}</div></div>')