"""Tiny dependency-free, theme-aware, self-contained SVG figure builders for the logbook.
Each returns a complete <div> with inline <svg> (a few KB), safe to embed in a figure cell."""

PALETTE = ["#2f6df6", "#d9480f", "#2b8a3e", "#8a5cf6", "#e8590c", "#0c8599"]


def _axes(w, h, pad):
    return (f'<line x1="{pad}" y1="{h-pad}" x2="{w-10}" y2="{h-pad}" stroke="currentColor" opacity="0.5"/>'
            f'<line x1="{pad}" y1="10" x2="{pad}" y2="{h-pad}" stroke="currentColor" opacity="0.5"/>')


def line_chart(xs, ys, title, xlabel, ylabel, ymax=100, hline=None, hline_label=None,
               w=720, h=420, pad=54, color="#d9480f"):
    xmin, xmax = min(xs), max(xs)

    def sx(x):
        return pad + (x - xmin) / (xmax - xmin + 1e-9) * (w - pad - 20)

    def sy(y):
        return (h - pad) - (y / ymax) * (h - pad - 20)
    pts = " ".join(f"{sx(x):.1f},{sy(y):.1f}" for x, y in zip(xs, ys))
    dots = "".join(f'<circle cx="{sx(x):.1f}" cy="{sy(y):.1f}" r="4" fill="{color}"/>' for x, y in zip(xs, ys))
    grid = ""
    for gy in range(0, ymax + 1, max(1, ymax // 5)):
        yy = sy(gy)
        grid += (f'<line x1="{pad}" y1="{yy:.1f}" x2="{w-10}" y2="{yy:.1f}" stroke="currentColor" opacity="0.12"/>'
                 f'<text x="{pad-8}" y="{yy+4:.1f}" text-anchor="end" font-size="11" fill="currentColor" opacity="0.7">{gy}</text>')
    xticks = ""
    for x in xs:
        xticks += f'<text x="{sx(x):.1f}" y="{h-pad+16}" text-anchor="middle" font-size="11" fill="currentColor" opacity="0.7">{x}</text>'
    hl = ""
    if hline is not None:
        yy = sy(hline)
        hl = (f'<line x1="{pad}" y1="{yy:.1f}" x2="{w-10}" y2="{yy:.1f}" stroke="#888" stroke-dasharray="5,4"/>'
              f'<text x="{w-14}" y="{yy-5:.1f}" text-anchor="end" font-size="11" fill="currentColor" opacity="0.8">{hline_label or ""}</text>')
    return f'''<div style="max-width:100%;overflow-x:auto">
<svg viewBox="0 0 {w} {h}" width="100%" style="font-family:system-ui,sans-serif;color:inherit">
<text x="{w/2}" y="20" text-anchor="middle" font-size="14" font-weight="600" fill="currentColor">{title}</text>
{grid}{_axes(w,h,pad)}{hl}
<polyline points="{pts}" fill="none" stroke="{color}" stroke-width="3"/>{dots}{xticks}
<text x="{w/2}" y="{h-6}" text-anchor="middle" font-size="12" fill="currentColor" opacity="0.8">{xlabel}</text>
<text x="16" y="{h/2}" text-anchor="middle" font-size="12" fill="currentColor" opacity="0.8" transform="rotate(-90 16 {h/2})">{ylabel}</text>
</svg></div>'''


def grouped_bars(categories, series, title, ylabel, ymax=100, hline=None, hline_label=None,
                 w=760, h=440, pad=56):
    """series: list of (name, [values aligned to categories])."""
    n_cat = len(categories)
    n_ser = len(series)
    plot_w = w - pad - 20
    group_w = plot_w / n_cat
    bar_w = group_w / (n_ser + 0.5)

    def sy(y):
        return (h - pad) - (y / ymax) * (h - pad - 40)
    grid = ""
    for gy in range(0, ymax + 1, max(1, ymax // 5)):
        yy = sy(gy)
        grid += (f'<line x1="{pad}" y1="{yy:.1f}" x2="{w-10}" y2="{yy:.1f}" stroke="currentColor" opacity="0.12"/>'
                 f'<text x="{pad-8}" y="{yy+4:.1f}" text-anchor="end" font-size="11" fill="currentColor" opacity="0.7">{gy}</text>')
    bars = ""
    labels = ""
    for ci, cat in enumerate(categories):
        gx = pad + ci * group_w
        for si, (sname, vals) in enumerate(series):
            v = vals[ci]
            if v is None:
                continue
            bx = gx + 6 + si * bar_w
            by = sy(v)
            bars += (f'<rect x="{bx:.1f}" y="{by:.1f}" width="{bar_w*0.9:.1f}" height="{(h-pad)-by:.1f}" '
                     f'fill="{PALETTE[si%len(PALETTE)]}" rx="2"><title>{sname}: {v}</title></rect>')
        labels += f'<text x="{gx+group_w/2:.1f}" y="{h-pad+16}" text-anchor="middle" font-size="10.5" fill="currentColor" opacity="0.75">{cat}</text>'
    hl = ""
    if hline is not None:
        yy = sy(hline)
        hl = (f'<line x1="{pad}" y1="{yy:.1f}" x2="{w-10}" y2="{yy:.1f}" stroke="#888" stroke-dasharray="5,4"/>'
              f'<text x="{w-14}" y="{yy-5:.1f}" text-anchor="end" font-size="11" fill="currentColor" opacity="0.85">{hline_label or ""}</text>')
    legend = ""
    lx = pad
    for si, (sname, _) in enumerate(series):
        legend += (f'<rect x="{lx}" y="{h-20}" width="12" height="12" fill="{PALETTE[si%len(PALETTE)]}" rx="2"/>'
                   f'<text x="{lx+16}" y="{h-10}" font-size="11" fill="currentColor">{sname}</text>')
        lx += 30 + len(sname) * 7.2
    return f'''<div style="max-width:100%;overflow-x:auto">
<svg viewBox="0 0 {w} {h}" width="100%" style="font-family:system-ui,sans-serif;color:inherit">
<text x="{w/2}" y="20" text-anchor="middle" font-size="14" font-weight="600" fill="currentColor">{title}</text>
{grid}{_axes(w,h,pad)}{hl}{bars}{labels}{legend}
<text x="16" y="{h/2}" text-anchor="middle" font-size="12" fill="currentColor" opacity="0.8" transform="rotate(-90 16 {h/2})">{ylabel}</text>
</svg></div>'''


def wrap(inner, title="figure"):
    return f'<!doctype html><meta charset="utf-8"><title>{title}</title><body style="margin:0;padding:8px">{inner}</body>'