"""Plotly figure factories for the DNA benchmark leaderboard."""

import json

import numpy as np
import pandas as pd
import plotly.graph_objects as go

from src.constants import (
    CATEGORY_COLORS,
    CATEGORY_DISPLAY_NAMES,
    CLASSIFICATION_METRICS,
    TASK_SEQ_LENGTHS,
)

# Model colour palette — pastel, full-opacity friendly, distinct from CATEGORY_COLORS
_MODEL_PALETTE = ["#F08E9E", "#64BDAD", "#F7C96A", "#7FAACC", "#B09AD8", "#80C89A", "#F5A978"]

# Shared horizontal legend layout used across multiple figures.
_LEGEND_H = dict(
    orientation="h", yanchor="bottom", y=1.02, xanchor="right", x=1,
    itemclick="toggle", itemdoubleclick="toggleothers",
)

# Speed/resource column metadata: col -> (display label, higher_x_is_better)
_SPEED_META: dict[str, tuple[str, bool]] = {
    "test_throughput_seq_s":   ("Throughput (seq/s)", True),
    "test_embedding_time_s":   ("Embedding Time (s)", False),
    "peak_vram_extraction_mb": ("Peak VRAM (MB)",     False),
    "vram_model_mb":           ("VRAM (MB)",          False),
}


def _model_color_map(models: list[str]) -> dict[str, str]:
    return {m: _MODEL_PALETTE[i % len(_MODEL_PALETTE)] for i, m in enumerate(sorted(models))}


def _pareto_mask(x: np.ndarray, y: np.ndarray, higher_x_better: bool) -> np.ndarray:
    """Return boolean mask: True = point is not dominated on (x, y).

    Dominated means some other point is at least as good on both axes and strictly
    better on at least one. y is always "higher is better" (MCC/metric).
    """
    n = len(x)
    dominated = np.zeros(n, dtype=bool)
    for i in range(n):
        for j in range(n):
            if i == j:
                continue
            x_ge = (x[j] >= x[i]) if higher_x_better else (x[j] <= x[i])
            y_ge = y[j] >= y[i]
            x_gt = (x[j] > x[i]) if higher_x_better else (x[j] < x[i])
            y_gt = y[j] > y[i]
            if x_ge and y_ge and (x_gt or y_gt):
                dominated[i] = True
                break
    return ~dominated


def _norm(val) -> str:
    """Normalise a possibly-null field to empty string."""
    if val is None or (isinstance(val, float) and pd.isna(val)):
        return ""
    return str(val)


def _fmt_layer(params_str) -> str:
    """Short label for layer selection from layer_selection_params JSON string."""
    if params_str is None or (isinstance(params_str, float) and pd.isna(params_str)):
        return "default"
    try:
        params = json.loads(params_str) if isinstance(params_str, str) else params_str
        if not params:
            return "default"
        idx = params.get("layer_index")
        strategy = params.get("strategy") or params.get("layer_selection_strategy")
        parts = []
        if strategy:
            parts.append(str(strategy))
        if idx is not None:
            parts.append(f"({int(idx)})")
        return " ".join(parts) if parts else "default"
    except (json.JSONDecodeError, TypeError):
        return "default"


def _variant_label(row: pd.Series) -> str:
    """Human-readable config label: 'short-hf-id · pooling · layer · head'."""
    parts = []
    hf = row.get("model_hf_id")
    if hf is not None and not (isinstance(hf, float) and pd.isna(hf)):
        parts.append(str(hf).rsplit("/", 1)[-1])
    pool = row.get("pooling_strategy")
    if pool is not None and not (isinstance(pool, float) and pd.isna(pool)):
        parts.append(str(pool))
    parts.append(_fmt_layer(row.get("layer_selection_params")))
    head = row.get("head_type")
    if head is not None and not (isinstance(head, float) and pd.isna(head)):
        parts.append(str(head))
    return " · ".join(parts)


def _variant_key_col(df: pd.DataFrame) -> pd.Series:
    """Return a Series of stable variant key strings (model_hf_id|pooling|layer|head)."""
    def _col(name: str) -> pd.Series:
        return df[name].map(_norm) if name in df.columns else pd.Series("", index=df.index)

    layer = (
        df["layer_selection_params"].apply(_fmt_layer)
        if "layer_selection_params" in df.columns
        else pd.Series("default", index=df.index)
    )
    return _col("model_hf_id") + "|" + _col("pooling_strategy") + "|" + layer + "|" + _col("head_type")


def _variant_hover_lines(vdf: pd.DataFrame) -> str:
    """Multi-line config block for heatmap hover, sourced from first row of variant group."""
    row = vdf.iloc[0]
    lines = []
    hf = row.get("model_hf_id")
    if hf is not None and not (isinstance(hf, float) and pd.isna(hf)):
        lines.append(f"HF model: {hf}")
    pool = row.get("pooling_strategy")
    if pool is not None and not (isinstance(pool, float) and pd.isna(pool)):
        lines.append(f"Pooling: {pool}")
    lines.append(f"Layer: {_fmt_layer(row.get('layer_selection_params'))}")
    head = row.get("head_type")
    if head is not None and not (isinstance(head, float) and pd.isna(head)):
        lines.append(f"Head: {head}")
    return "<br>".join(lines)


# ---------------------------------------------------------------------------
# 0. Top-N filter helper
# ---------------------------------------------------------------------------

def top_n_variants(df: pd.DataFrame, metric: str, n: int) -> pd.DataFrame:
    """Return df filtered to the top-N variants by mean metric (all tasks of those variants kept)."""
    if not n or df.empty or metric not in df.columns:
        return df
    tmp = df.copy()
    tmp["_vkey"] = _variant_key_col(tmp)
    # dropna first: nlargest on a nullable Float64 Series pads with NA once real values run
    # out (e.g. a metric only a few variants report, like AUPRC), pulling in variants that
    # never reported this metric at all instead of just returning fewer real ones.
    means = tmp.groupby("_vkey")[metric].mean().dropna()
    top_keys = set(means.nlargest(n).index)
    return df[tmp["_vkey"].isin(top_keys)].reset_index(drop=True)


# ---------------------------------------------------------------------------
# 1. Ranking bar — variant leaderboard as horizontal bar chart
# ---------------------------------------------------------------------------

def ranking_bar(df: pd.DataFrame, metric: str) -> go.Figure:
    """Horizontal bar chart: one bar per variant sorted by Overall mean, legend by model family."""
    if df.empty or metric not in df.columns:
        return go.Figure()

    df = df.copy()
    df["_vkey"] = _variant_key_col(df)

    models = sorted(df["model_alias"].unique()) if "model_alias" in df.columns else []
    model_color_map = _model_color_map(models)
    metric_label = CLASSIFICATION_METRICS.get(metric, metric)

    records = []
    for vkey, group in df.groupby("_vkey"):
        first = group.iloc[0]
        model = _norm(first.get("model_alias", ""))
        label = _variant_label(first)
        overall_vals = group[metric].dropna()
        overall = round(float(overall_vals.mean()), 3) if not overall_vals.empty else None
        breakdown = {}
        for cat_key, cat_label in CATEGORY_DISPLAY_NAMES.items():
            if cat_key == "other":
                continue
            cat_data = group[group["task_category"] == cat_key][metric].dropna()
            breakdown[cat_label] = round(float(cat_data.mean()), 3) if not cat_data.empty else None
        records.append({"label": label, "model": model, "overall": overall, "breakdown": breakdown})

    records.sort(key=lambda r: r["overall"])  # ascending → best at top (plotly y goes bottom-to-top)
    y_order = [r["label"] for r in records]

    fig = go.Figure()
    legend_shown: set[str] = set()
    for rec in records:
        m = rec["model"]
        color = model_color_map.get(m, _MODEL_PALETTE[0])
        show_legend = m not in legend_shown
        legend_shown.add(m)
        breakdown_lines = "<br>".join(
            f"{k}: {v:.3f}" for k, v in rec["breakdown"].items() if v is not None
        )
        hover = f"<b>{rec['label']}</b><br>Overall: {rec['overall']:.3f}"
        if breakdown_lines:
            hover += "<br>" + breakdown_lines
        fig.add_trace(go.Bar(
            y=[rec["label"]],
            x=[rec["overall"]],
            orientation="h",
            name=m,
            marker_color=color,
            legendgroup=m,
            showlegend=show_legend,
            hovertemplate=hover + "<extra></extra>",
        ))

    n = len(records)
    height = max(400, n * 26 + 120)
    left_margin = min(max((len(lbl) for lbl in y_order), default=20) * 7, 380)

    fig.update_layout(
        title=f"Variant ranking — {metric_label}",
        xaxis_title=metric_label,
        height=height,
        template="plotly_white",
        legend=_LEGEND_H,
        margin=dict(l=left_margin, r=20, t=60, b=40),
    )
    fig.update_yaxes(
        categoryorder="array",
        categoryarray=y_order,
        automargin=True,
    )
    return fig


# ---------------------------------------------------------------------------
# 2. Strip plot — per-task scores per variant, coloured by task category
# ---------------------------------------------------------------------------

def strip_plot(df: pd.DataFrame, metric: str) -> go.Figure:
    """Strip/dot plot: y = variant (rank 1 at top), x = metric per task, dots by task category."""
    if df.empty or metric not in df.columns:
        return go.Figure()

    df = df.copy()
    df["_vkey"] = _variant_key_col(df)
    metric_label = CLASSIFICATION_METRICS.get(metric, metric)

    # Order variants globally by mean metric descending (rank 1 = i=0 = top)
    vkey_means = df.groupby("_vkey")[metric].mean().sort_values(ascending=False)
    ordered_vkeys = vkey_means.index.tolist()
    vkey_to_i = {vk: i for i, vk in enumerate(ordered_vkeys)}

    fig = go.Figure()
    shown_cats: set[str] = set()
    rng = np.random.default_rng(seed=42)

    for cat, cat_df in df.groupby("task_category"):
        color = CATEGORY_COLORS.get(cat, CATEGORY_COLORS["other"])
        cat_label = CATEGORY_DISPLAY_NAMES.get(cat, cat)
        show_legend = cat not in shown_cats
        shown_cats.add(cat)

        y_base = cat_df["_vkey"].map(vkey_to_i).astype(float)
        y_jitter = y_base + rng.uniform(-0.3, 0.3, len(cat_df))

        fig.add_trace(go.Scatter(
            x=cat_df[metric],
            y=y_jitter,
            mode="markers",
            name=cat_label,
            marker=dict(color=color, size=6, opacity=0.6, line=dict(width=1, color="white")),
            text=cat_df["task_name"],
            hovertemplate=f"<b>%{{text}}</b><br>{metric_label}: %{{x:.3f}}<extra></extra>",
            legendgroup="cat_" + cat,
            showlegend=show_legend,
        ))

    # Short vertical tick at mean per variant
    for vk, i in vkey_to_i.items():
        mean_val = float(vkey_means[vk])
        fig.add_shape(
            type="line",
            x0=mean_val, x1=mean_val,
            y0=i - 0.35, y1=i + 0.35,
            line=dict(color="rgba(60,60,60,0.6)", width=2),
        )

    tick_labels = [_variant_label(df[df["_vkey"] == vk].iloc[0]) for vk in ordered_vkeys]
    n = len(ordered_vkeys)
    height = max(500, n * 22 + 120)

    fig.update_layout(
        title=f"{metric_label} per task by variant — rank 1 at top",
        xaxis_title=metric_label,
        height=height,
        template="plotly_white",
        legend=_LEGEND_H,
    )
    fig.update_yaxes(
        tickmode="array",
        tickvals=list(range(n)),
        ticktext=tick_labels,
        autorange="reversed",  # i=0 (rank 1) at top
        automargin=True,
    )
    return fig


# ---------------------------------------------------------------------------
# 3. Heatmap — single model: all variants as rows; multi-model: best variant per family
# ---------------------------------------------------------------------------

def heatmap_variants(
    df: pd.DataFrame,
    metric: str,
    model_alias: str | list[str],
    aggregate_by_dataset: bool = False,
    show_all_variants: bool = False,
) -> go.Figure:
    """Heatmap: variant rows vs task columns.

    Single model: rows = all config variants.
    Multiple models: rows = best variant per family (highest mean metric for that family),
    unless show_all_variants is True, in which case every variant of every selected model is a row.
    """
    metric_label = CLASSIFICATION_METRICS.get(metric, metric)

    if isinstance(model_alias, str):
        model_aliases = [model_alias] if model_alias else []
    else:
        model_aliases = [m for m in (model_alias or []) if m]

    if not model_aliases or df.empty or metric not in df.columns:
        return go.Figure()

    multi_model = len(model_aliases) > 1

    mdf = (
        df[df["model_alias"].isin(model_aliases)]
        if multi_model
        else df[df["model_alias"] == model_aliases[0]]
    ).copy()
    if mdf.empty:
        return go.Figure()

    mdf["_vkey"] = _variant_key_col(mdf)

    if multi_model and not show_all_variants:
        rows_iter = []
        for m in model_aliases:
            family_df = mdf[mdf["model_alias"] == m]
            if family_df.empty:
                continue
            # Pick the variant with highest mean metric for this family. A variant/head
            # (e.g. ridge, regression-only) that never reports this metric has an all-NaN
            # group mean — idxmax would raise, and it'd render as an all-blank row anyway.
            vkey_means = family_df.groupby("_vkey")[metric].mean().dropna()
            if vkey_means.empty:
                continue
            best_vkey = vkey_means.idxmax()
            best_df = family_df[family_df["_vkey"] == best_vkey]
            rows_iter.append((_variant_label(best_df.iloc[0]), best_df))
    else:
        configs = sorted(
            c for c in mdf["_vkey"].unique() if mdf[mdf["_vkey"] == c][metric].notna().any()
        )
        rows_iter = [
            (_variant_label(mdf[mdf["_vkey"] == c].iloc[0]), mdf[mdf["_vkey"] == c])
            for c in configs
        ]

    # A task/dataset only gets a column if the selected metric is ever reported for it —
    # e.g. bulk_rna_expression is regression-only (r2_test), so it never has mcc_test/
    # accuracy_test/etc. and would otherwise render as an all-blank column.
    if aggregate_by_dataset:
        col_keys = (
            sorted(
                d for d in mdf["dataset_name"].dropna().unique()
                if df[df["dataset_name"] == d][metric].notna().any()
            )
            if "dataset_name" in mdf.columns
            else []
        )
        col_names = col_keys

        def _cell_vals(vdf: pd.DataFrame, col_key: str) -> pd.Series:
            return vdf[vdf["dataset_name"] == col_key][metric].dropna()
    else:
        col_keys, col_names = [], []
        for cat in CATEGORY_DISPLAY_NAMES:
            for task in sorted(mdf[mdf["task_category"] == cat]["task_name"].unique()):
                if not df[df["task_name"] == task][metric].notna().any():
                    continue
                col_keys.append(task)
                col_names.append(task)

        def _cell_vals(vdf: pd.DataFrame, col_key: str) -> pd.Series:
            return vdf[vdf["task_name"] == col_key][metric].dropna()

    if not rows_iter:
        return go.Figure()

    col_names = col_names + ["Overall"]

    rows_z, rows_text, rows_hover, row_labels = [], [], [], []
    for label, vdf in rows_iter:
        z_row, t_row, h_row = [], [], []
        config_lines = _variant_hover_lines(vdf)
        for col_key, col_name in zip(col_keys, col_names[:-1]):
            vals = _cell_vals(vdf, col_key)
            v = round(float(vals.mean()), 3) if not vals.empty else None
            z_row.append(v)
            t_row.append(f"{v:.3f}" if v is not None else "—")
            v_str = f"{v:.3f}" if v is not None else "N/A"
            h_row.append(f"<b>{col_name}</b><br>{metric_label}: {v_str}<br>{config_lines}")
        overall_vals = vdf[metric].dropna()
        overall = round(float(overall_vals.mean()), 3) if not overall_vals.empty else None
        z_row.append(overall)
        t_row.append(f"{overall:.3f}" if overall is not None else "—")
        ov_str = f"{overall:.3f}" if overall is not None else "N/A"
        h_row.append(f"<b>Overall</b><br>{metric_label}: {ov_str}<br>{config_lines}")
        rows_z.append(z_row)
        rows_text.append(t_row)
        rows_hover.append(h_row)
        row_labels.append(label)

    if len(rows_z) > 1:
        sort_idx = sorted(range(len(rows_z)), key=lambda i: rows_z[i][-1] or -1, reverse=True)
        rows_z = [rows_z[i] for i in sort_idx][::-1]
        rows_text = [rows_text[i] for i in sort_idx][::-1]
        rows_hover = [rows_hover[i] for i in sort_idx][::-1]
        row_labels = [row_labels[i] for i in sort_idx][::-1]

    zmin = -1 if metric == "mcc_test" else 0
    n_data_cols = len(col_keys)
    cell_font_size = 9 if n_data_cols > 10 else 12
    tick_angle = -45 if not aggregate_by_dataset else 0

    fig = go.Figure(
        go.Heatmap(
            z=rows_z,
            x=col_names,
            y=row_labels,
            text=rows_text,
            texttemplate="%{text}",
            textfont=dict(size=cell_font_size, color="black"),
            hovertext=rows_hover,
            hovertemplate="%{hovertext}<extra></extra>",
            colorscale="RdYlGn",
            zmin=zmin,
            zmax=1,
            colorbar=dict(title=metric_label, thickness=14, nticks=5, tickformat=".2f", lenmode="pixels", len=220),
            hoverongaps=False,
        )
    )

    fig.add_shape(
        type="rect",
        x0=n_data_cols - 0.5, x1=n_data_cols + 0.5,
        y0=-0.5, y1=len(rows_z) - 0.5,
        line=dict(color="#333", width=2),
        fillcolor="rgba(0,0,0,0)",
    )

    n_rows = len(rows_z)
    left_margin = min(max(len(lbl) for lbl in row_labels) * 7, 320)
    bottom_margin = 120 if not aggregate_by_dataset else 20
    t_margin = 120 if not aggregate_by_dataset else 80
    v_overhead = t_margin + bottom_margin
    height = max(v_overhead + 80, n_rows * 48 + v_overhead + 20)

    title = f"{metric_label} — {', '.join(model_aliases)}"
    if multi_model:
        title += " (best variant per family)"

    fig.update_layout(
        title=title,
        height=height,
        template="plotly_white",
        xaxis=dict(side="top", tickfont=dict(size=9 if not aggregate_by_dataset else 11), tickangle=tick_angle),
        yaxis=dict(tickfont=dict(size=10), automargin=True),
        margin=dict(l=left_margin, r=20, t=t_margin, b=bottom_margin),
    )
    return fig


# ---------------------------------------------------------------------------
# 4 & 5. Grouped bar chart — shared helper + two public wrappers
# ---------------------------------------------------------------------------

def _grouped_bar(
    df: pd.DataFrame,
    metric: str,
    x_items: list,
    x_labels: list[str],
    get_vals,  # Callable[[variant_df, item], pd.Series]
    title: str,
    legend_by_model: bool = False,
) -> go.Figure:
    """Grouped bar: one bar series per variant, coloured by model family. Sorted by overall mean.

    legend_by_model=True collapses legend entries to model alias (one entry per family).
    """
    df = df.copy()
    df["_vkey"] = _variant_key_col(df)

    models = sorted(df["model_alias"].unique()) if "model_alias" in df.columns else []
    model_color_map = _model_color_map(models)
    metric_label = CLASSIFICATION_METRICS.get(metric, metric)

    vkey_order = df.groupby("_vkey")[metric].mean().sort_values(ascending=False).index.tolist()

    fig = go.Figure()
    legend_shown: set[str] = set()
    for vkey in vkey_order:
        vdf = df[df["_vkey"] == vkey]
        first = vdf.iloc[0]
        model = _norm(first.get("model_alias", ""))
        label = _variant_label(first)
        color = model_color_map.get(model, _MODEL_PALETTE[0])
        y_vals = [
            round(float(vals.mean()), 3) if not (vals := get_vals(vdf, item).dropna()).empty else None
            for item in x_items
        ]
        if legend_by_model:
            show_legend = model not in legend_shown
            legend_shown.add(model)
            fig.add_trace(go.Bar(
                name=model, x=x_labels, y=y_vals, marker_color=color,
                legendgroup=model, showlegend=show_legend,
                hovertemplate=f"<b>{label}</b><br>%{{x}}: %{{y:.3f}}<extra></extra>",
            ))
        else:
            fig.add_trace(go.Bar(name=label, x=x_labels, y=y_vals, marker_color=color))

    fig.update_layout(
        title=title, yaxis_title=metric_label, barmode="group",
        height=440, template="plotly_white", legend=_LEGEND_H,
    )
    return fig


def bar_plot_per_category(df: pd.DataFrame, metric: str) -> go.Figure:
    """Grouped bar: X = task category, bar series = variants coloured by model family."""
    if df.empty or metric not in df.columns:
        return go.Figure()
    active_cats = df["task_category"].unique()
    categories = [k for k in CATEGORY_DISPLAY_NAMES if k != "other" and k in active_cats]
    metric_label = CLASSIFICATION_METRICS.get(metric, metric)
    return _grouped_bar(
        df, metric,
        x_items=categories,
        x_labels=[CATEGORY_DISPLAY_NAMES[c] for c in categories],
        get_vals=lambda mdf, cat: mdf[mdf["task_category"] == cat][metric],
        title=f"{metric_label} per task category",
        legend_by_model=True,
    )


def bar_plot_per_task(df: pd.DataFrame, metric: str, category: str) -> go.Figure:
    """Grouped bar: X = individual tasks within category, bar series = variants."""
    if df.empty or metric not in df.columns or not category:
        return go.Figure()
    task_df = df[df["task_category"] == category]
    if task_df.empty:
        fig = go.Figure()
        fig.add_annotation(text=f"No data for category '{category}'", showarrow=False,
                           xref="paper", yref="paper", x=0.5, y=0.5)
        return fig
    tasks = sorted(task_df["task_name"].unique())
    metric_label = CLASSIFICATION_METRICS.get(metric, metric)
    cat_label = CATEGORY_DISPLAY_NAMES.get(category, category)
    return _grouped_bar(
        task_df, metric,
        x_items=tasks,
        x_labels=tasks,
        get_vals=lambda mdf, task: mdf[mdf["task_name"] == task][metric],
        title=f"{metric_label} per task — {cat_label}",
        legend_by_model=True,
    )


# ---------------------------------------------------------------------------
# 6. Speed vs Performance scatter — one point per variant, Pareto highlighted
# ---------------------------------------------------------------------------

def scatter_speed(
    df: pd.DataFrame,
    metric: str,
    speed_col: str | None = None,
    log_scale: bool = True,
) -> go.Figure:
    """Scatter: mean metric vs mean speed/VRAM, one point per variant.

    Pareto-frontier variants (not dominated on the two axes) are highlighted
    with a larger marker, black outline, and short text label. Dominated
    variants are shown faded. Speed values are averaged across tasks because
    throughput and embedding time vary with sequence length.
    """
    if df.empty or metric not in df.columns:
        return go.Figure()

    available = [c for c in _SPEED_META if c in df.columns]
    if not available:
        fig = go.Figure()
        fig.add_annotation(
            text="Speed metrics not available in data",
            showarrow=False, xref="paper", yref="paper", x=0.5, y=0.5,
        )
        return fig

    if speed_col is None or speed_col not in df.columns:
        speed_col = available[0]

    speed_lbl, higher_x_better = _SPEED_META[speed_col]
    metric_label = CLASSIFICATION_METRICS.get(metric, metric)

    df = df.copy()
    df["_vkey"] = _variant_key_col(df)

    # Aggregate to one row per variant; speed cols averaged across tasks
    agg_cols: dict = {metric: "mean", "model_alias": "first"}
    for c in available:
        agg_cols[c] = "mean"

    vdf = df.groupby("_vkey").agg(agg_cols).reset_index()

    # Full hover label (variant_label) and short display label for Pareto text
    first_rows = {vk: grp.iloc[0] for vk, grp in df.groupby("_vkey")}
    vdf["_label"] = vdf["_vkey"].map(lambda vk: _variant_label(first_rows[vk]))
    vdf["_short"] = vdf["_vkey"].map(
        lambda vk: (
            _norm(first_rows[vk].get("model_alias", ""))
            + (" · " + _norm(first_rows[vk].get("pooling_strategy", ""))
               if _norm(first_rows[vk].get("pooling_strategy", "")) else "")
        )
    )

    valid = vdf[[speed_col, metric]].notna().all(axis=1)
    vdf = vdf[valid].reset_index(drop=True)
    if vdf.empty:
        fig = go.Figure()
        fig.add_annotation(
            text=f"No valid data for {speed_lbl}",
            showarrow=False, xref="paper", yref="paper", x=0.5, y=0.5,
        )
        return fig

    pareto = _pareto_mask(
        vdf[speed_col].to_numpy(dtype=float),
        vdf[metric].to_numpy(dtype=float),
        higher_x_better=higher_x_better,
    )
    vdf["_pareto"] = pareto

    models = sorted(vdf["model_alias"].dropna().unique()) if "model_alias" in vdf.columns else []
    model_color_map = _model_color_map(models)
    legend_shown: set[str] = set()
    fig = go.Figure()

    hover_tmpl = (
        "<b>%{text}</b><br>"
        + f"{speed_lbl} (mean): %{{x}}<br>"
        + f"{metric_label}: %{{y:.3f}}<extra></extra>"
    )

    # Dominated points — faded, small
    for model in models:
        mdf = vdf[(vdf["model_alias"] == model) & ~vdf["_pareto"]]
        if mdf.empty:
            continue
        color = model_color_map.get(model, _MODEL_PALETTE[0])
        show_legend = model not in legend_shown
        legend_shown.add(model)
        fig.add_trace(go.Scatter(
            x=mdf[speed_col], y=mdf[metric],
            mode="markers",
            name=model, legendgroup=model, showlegend=show_legend,
            marker=dict(color=color, size=8, opacity=0.25, line=dict(width=0)),
            text=mdf["_label"],
            hovertemplate=hover_tmpl,
        ))

    # Pareto points — solid, labeled, black outline
    for model in models:
        mdf = vdf[(vdf["model_alias"] == model) & vdf["_pareto"]]
        if mdf.empty:
            continue
        color = model_color_map.get(model, _MODEL_PALETTE[0])
        show_legend = model not in legend_shown
        legend_shown.add(model)
        fig.add_trace(go.Scatter(
            x=mdf[speed_col], y=mdf[metric],
            mode="markers+text",
            name=model, legendgroup=model, showlegend=show_legend,
            marker=dict(color=color, size=14, opacity=0.9, line=dict(width=2, color="black")),
            text=mdf["_short"],
            textposition="top center",
            textfont=dict(size=9, color="#222"),
            customdata=mdf[["_label"]].values,
            hovertemplate=(
                "<b>%{customdata[0]}</b><br>"
                + f"{speed_lbl} (mean): %{{x}}<br>"
                + f"{metric_label}: %{{y:.3f}}<extra></extra>"
            ),
        ))

    # Pareto legend symbol
    fig.add_trace(go.Scatter(
        x=[None], y=[None], mode="markers",
        name="Pareto frontier",
        marker=dict(
            color="rgba(0,0,0,0)", size=14,
            line=dict(width=2, color="black"),
            symbol="circle",
        ),
        showlegend=True, legendgroup="__pareto__",
    ))

    direction = "higher = faster" if higher_x_better else "lower = cheaper"
    fig.update_layout(
        title=f"{metric_label} vs {speed_lbl}  ({direction})",
        xaxis=dict(
            title_text=f"{speed_lbl} — mean across tasks",
            type="log" if log_scale else "linear",
        ),
        yaxis_title=metric_label,
        height=540,
        template="plotly_white",
        legend=_LEGEND_H,
    )
    return fig


def efficiency_table(df: pd.DataFrame, metric: str) -> pd.DataFrame:
    """Per-variant efficiency summary: MCC, speed, VRAM, and derived MCC/sec, MCC/MB.

    Sorted by metric descending. Speed values are means across tasks.
    """
    if df.empty or metric not in df.columns:
        return pd.DataFrame()

    df = df.copy()
    df["_vkey"] = _variant_key_col(df)

    available_speed = [c for c in _SPEED_META if c in df.columns]
    agg_cols: dict = {metric: "mean", "model_alias": "first"}
    for c in available_speed:
        agg_cols[c] = "mean"

    vdf = df.groupby("_vkey").agg(agg_cols).reset_index()

    first_rows = {vk: grp.iloc[0] for vk, grp in df.groupby("_vkey")}
    vdf["_label"] = vdf["_vkey"].map(lambda vk: _variant_label(first_rows[vk]))
    vdf = vdf.sort_values(metric, ascending=False).reset_index(drop=True)

    metric_label = CLASSIFICATION_METRICS.get(metric, metric)
    out = pd.DataFrame()
    out["Variant"] = vdf["_label"]
    out["Family"] = vdf.get("model_alias", pd.Series("", index=vdf.index))
    out[metric_label] = vdf[metric].round(3)

    thr_col = next((c for c in ["test_throughput_seq_s"] if c in vdf.columns), None)
    emb_col = next((c for c in ["test_embedding_time_s"] if c in vdf.columns), None)
    vram_col = next((c for c in ["peak_vram_extraction_mb", "vram_model_mb"] if c in vdf.columns), None)

    if thr_col:
        out["Throughput (seq/s)"] = vdf[thr_col].round(2)
    if emb_col:
        out["Emb. Time (s)"] = vdf[emb_col].round(4)
        out["MCC/sec"] = (vdf[metric] / vdf[emb_col].replace(0, float("nan"))).round(4)
    if vram_col:
        vram_lbl = _SPEED_META[vram_col][0]
        out[vram_lbl] = vdf[vram_col].round(1)
        out["MCC/MB"] = (vdf[metric] / vdf[vram_col].replace(0, float("nan"))).round(6)

    return out.reset_index(drop=True)


# ---------------------------------------------------------------------------
# 7. Context length bubble chart
# ---------------------------------------------------------------------------

def bubble_context_length(df: pd.DataFrame, metric: str) -> go.Figure:
    """Bubble chart: X=task_seq_length, Y=metric, color=model family, size=max_context_size.

    One bubble per (variant, task). Legend grouped by model family.
    """
    if not TASK_SEQ_LENGTHS:
        fig = go.Figure()
        fig.add_annotation(
            text=(
                "Sequence length data not available.<br>"
                "Run <b>python tools/compute_seq_lengths.py</b> to populate it."
            ),
            showarrow=False, font=dict(size=14), xref="paper", yref="paper", x=0.5, y=0.5,
        )
        fig.update_layout(height=480, template="plotly_white")
        return fig

    if df.empty or metric not in df.columns or "task_seq_length" not in df.columns:
        return go.Figure()

    _CONFIG_COLS = ["model_hf_id", "pooling_strategy", "layer_selection_params", "head_type"]
    extra_cols = [c for c in _CONFIG_COLS if c in df.columns]
    base_cols = ["model_alias", "task_name", "task_seq_length", metric, "max_context_size"]
    plot_df = df[base_cols + extra_cols].dropna(subset=["task_seq_length", metric]).copy()

    plot_df["_vkey"] = _variant_key_col(plot_df)
    if "layer_selection_params" in plot_df.columns:
        plot_df["_layer_info"] = plot_df["layer_selection_params"].apply(_fmt_layer)

    def _config_str(row: pd.Series) -> str:
        parts = []
        for col, lbl in [("model_hf_id", "HF model"), ("pooling_strategy", "Pooling"),
                         ("_layer_info", "Layer"), ("head_type", "Head")]:
            if col not in row.index:
                continue
            v = row[col]
            if v is not None and not (isinstance(v, float) and pd.isna(v)):
                parts.append(f"{lbl}: {v}")
        return "<br>".join(parts)

    plot_df["_config_str"] = plot_df.apply(_config_str, axis=1)

    models = sorted(plot_df["model_alias"].unique()) if "model_alias" in plot_df.columns else []
    model_color_map = _model_color_map(models)
    max_ctx = plot_df["max_context_size"].max() or 1
    metric_label = CLASSIFICATION_METRICS.get(metric, metric)
    fig = go.Figure()

    legend_shown: set[str] = set()

    for vkey in plot_df["_vkey"].unique():
        vdf = plot_df[plot_df["_vkey"] == vkey]
        first = vdf.iloc[0]
        model = _norm(first.get("model_alias", ""))
        label = _variant_label(first)
        color = model_color_map.get(model, _MODEL_PALETTE[0])
        show_legend = model not in legend_shown
        legend_shown.add(model)

        sizes = (vdf["max_context_size"].fillna(max_ctx) / max_ctx * 40 + 8).clip(8, 50)
        cd = vdf[["max_context_size", "_config_str"]].to_numpy(dtype=object)
        fig.add_trace(
            go.Scatter(
                x=vdf["task_seq_length"], y=vdf[metric], mode="markers",
                name=model, text=vdf["task_name"],
                marker=dict(size=sizes, color=color, opacity=0.7, line=dict(width=1, color="white")),
                customdata=cd,
                legendgroup=model, showlegend=show_legend,
                hovertemplate=(
                    f"<b>%{{text}}</b> — {label}<br>"
                    "Seq length: %{x} bp<br>"
                    f"{metric_label}: %{{y:.3f}}<br>"
                    "Max context: %{customdata[0]} bp<br>"
                    "%{customdata[1]}<extra></extra>"
                ),
            )
        )

    fig.update_layout(
        title=f"{metric_label} vs task sequence length (bubble size = model max context)",
        xaxis_title="Task sequence length (bp)",
        yaxis_title=metric_label,
        height=520,
        template="plotly_white",
        legend=_LEGEND_H,
    )
    return fig