"""
StepProbe: Paper Figure Generation

Generates all figures for the paper:
    1. Step Survival Rate (SSR) curves
    2. Error Type Distribution heatmap
    3. First Failure Step (FFS) distributions
    4. Accuracy vs. bit-width degradation
    5. Error Cascade Rate by model size
    6. Restoration before/after comparison
"""

import json
import os
import sys
import glob
from typing import List, Dict

import numpy as np
import matplotlib.pyplot as plt
import matplotlib
matplotlib.rcParams.update({
    "font.family": "sans-serif",
    "font.size": 11,
    "axes.titlesize": 13,
    "axes.labelsize": 12,
    "xtick.labelsize": 10,
    "ytick.labelsize": 10,
    "legend.fontsize": 10,
    "figure.dpi": 150,
    "savefig.dpi": 300,
    "savefig.bbox": "tight",
})

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from stepprobe.utils import load_json


# Color palette (colorblind-friendly)
# Paired palette: the "restored" variant shares a hue with its base so the
# eye can pair them instantly. Base = saturated, restored = desaturated.
COLORS = {
    "fp16":                  "#1F4E79",  # navy — reference
    "awq_w4":                "#A23B72",
    "awq_w4_restored":       "#D9A9C4",
    "gptq_w4":               "#C73E1D",
    "gptq_w4_restored":      "#EFB4A6",
    "bnb_nf4_w4":            "#0B7A75",
    "bnb_nf4_w4_restored":   "#8FC8C5",
}

ERROR_COLORS = {
    "conceptual":    "#2E86AB",
    "methodological": "#A23B72",
    "executional":   "#F18F01",
    "logical":       "#C73E1D",
}

# Canonical ordering so paired (base, restored) bars always sit next to each
# other and colors line up across figures.
QUANT_ORDER = [
    "awq_w4", "awq_w4_restored",
    "gptq_w4", "gptq_w4_restored",
    "bnb_nf4_w4", "bnb_nf4_w4_restored",
]


def _pretty_label(q: str) -> str:
    """Short, lowercase-friendly label: 'gptq_w4_restored' -> 'GPTQ w4 (restored)'."""
    if q.endswith("_restored"):
        base = q[: -len("_restored")]
        return f"{_pretty_label(base)} (restored)"
    if q == "bnb_nf4_w4":
        return "BnB NF4"
    if q == "fp16":
        return "FP16"
    parts = q.split("_w")
    if len(parts) == 2 and parts[1].isdigit():
        return f"{parts[0].upper()} w{parts[1]}"
    return q


def _sorted_results(results):
    """Return results ordered by QUANT_ORDER so figures are consistent."""
    order = {q: i for i, q in enumerate(QUANT_ORDER)}
    return sorted(results, key=lambda r: order.get(r.get("quantization", ""), 999))


BENCHMARKS_KNOWN = ("gsm8k", "math500", "gpqa")


def _benchmark_from_filename(fname: str) -> str:
    """Extract the benchmark from a metrics filename.

    Filenames written by stepprobe.metrics look like
      {model}_{quant}_{benchmark}_run{N}_metrics.json
    and both model and quant contain underscores, so we match the benchmark
    by a known-values list rather than by position.
    """
    import re
    for bench in BENCHMARKS_KNOWN:
        if re.search(rf"_{bench}_run\d+_metrics\.json$", fname):
            return bench
    return "unknown"


def load_all_metrics(metrics_dir: str) -> List[dict]:
    """Load all metrics JSON files from a directory, annotating each with its benchmark."""
    results = []
    for f in sorted(glob.glob(os.path.join(metrics_dir, "*_metrics.json"))):
        data = load_json(f)
        data["benchmark"] = _benchmark_from_filename(os.path.basename(f))
        results.append(data)
    return results


def fig1_ssr_curves(results: List[dict], output_path: str, title_suffix: str = ""):
    """
    Figure 1: Step Survival Rate curves.
    Base quants drawn solid, restored variants drawn dashed in the same hue.
    """
    fig, ax = plt.subplots(figsize=(8.5, 5.2))

    for r in _sorted_results(results):
        quant = r.get("quantization", "")
        ssr = r.get("ssr_curve", [])
        if not ssr:
            continue
        color = COLORS.get(quant, "#888888")
        is_restored = quant.endswith("_restored")
        ax.plot(
            range(len(ssr)), ssr,
            label=_pretty_label(quant),
            color=color,
            linewidth=2.0 if not is_restored else 2.0,
            linestyle="--" if is_restored else "-",
            alpha=0.95,
        )

    ax.set_xlabel("Reasoning step depth")
    ax.set_ylabel("Fraction of runs still correct")
    title = "Step survival — how reasoning degrades with depth"
    if title_suffix:
        title = f"{title}\n{title_suffix}"
    ax.set_title(title)
    ax.set_ylim(0, 1.05)
    ax.legend(loc="upper right", frameon=True, framealpha=0.9, ncol=1)
    ax.grid(True, alpha=0.25)
    ax.spines["top"].set_visible(False)
    ax.spines["right"].set_visible(False)

    plt.savefig(output_path)
    plt.close()
    print(f"  Fig 1 saved: {output_path}")


def fig2_error_type_heatmap(results: List[dict], output_path: str, title_suffix: str = ""):
    """
    Figure 2: Error type distribution per quantization.
    Paired base/restored rows so you can read "did restoration reduce the
    conceptual/logical error share?" at a glance.
    """
    error_types = ["conceptual", "methodological", "executional", "logical"]
    sorted_res = _sorted_results([r for r in results if r.get("error_type_dist")])
    if not sorted_res:
        print("  [SKIP] No error distribution data for heatmap")
        return

    quants = [r["quantization"] for r in sorted_res]
    data = np.array([[r["error_type_dist"].get(e, 0) for e in error_types] for r in sorted_res])

    fig, ax = plt.subplots(figsize=(7.5, 0.55 * len(quants) + 1.6))
    im = ax.imshow(data, cmap="YlOrRd", aspect="auto", vmin=0, vmax=max(0.6, data.max()))

    ax.set_xticks(range(len(error_types)))
    ax.set_xticklabels([e.capitalize() for e in error_types])
    ax.set_yticks(range(len(quants)))
    ax.set_yticklabels([_pretty_label(q) for q in quants])

    for i in range(len(quants)):
        for j in range(len(error_types)):
            val = data[i, j]
            color = "white" if val > 0.35 else "black"
            ax.text(j, i, f"{val:.0%}", ha="center", va="center", color=color, fontsize=10)

    title = "Error type distribution by quantization"
    if title_suffix:
        title = f"{title}\n{title_suffix}"
    ax.set_title(title)
    plt.colorbar(im, ax=ax, label="Fraction of errors", fraction=0.04, pad=0.04)
    plt.savefig(output_path)
    plt.close()
    print(f"  Fig 2 saved: {output_path}")


def _plot_paired_bars(ax, results, value_fn, *, ylabel, percent=False):
    """Draw grouped (base, restored) bars for the three quant methods.

    Each method family (awq, gptq, bnb_nf4) gets one group on the x-axis.
    Within a group: two adjacent bars — base (darker) and restored (lighter).
    Bars are annotated with their numeric value.
    """
    families = [("awq_w4", "awq_w4_restored", "AWQ w4"),
                ("gptq_w4", "gptq_w4_restored", "GPTQ w4"),
                ("bnb_nf4_w4", "bnb_nf4_w4_restored", "BnB NF4")]
    by_q = {r.get("quantization", ""): r for r in results}

    x = np.arange(len(families))
    width = 0.36
    base_vals, restored_vals = [], []
    for base_q, rest_q, _ in families:
        base_vals.append(value_fn(by_q.get(base_q)))
        restored_vals.append(value_fn(by_q.get(rest_q)))

    base_colors = [COLORS.get(families[i][0], "#888888") for i in range(len(families))]
    rest_colors = [COLORS.get(families[i][1], "#BBBBBB") for i in range(len(families))]

    b1 = ax.bar(x - width / 2, base_vals, width, color=base_colors,
                edgecolor="white", linewidth=0.6, label="Quantized")
    b2 = ax.bar(x + width / 2, restored_vals, width, color=rest_colors,
                edgecolor="white", linewidth=0.6, label="Restored")

    def fmt(v):
        if v is None or (isinstance(v, float) and (v != v)):
            return ""
        return f"{v:.0%}" if percent else f"{v:.2f}"

    for bars, vals in ((b1, base_vals), (b2, restored_vals)):
        for bar, v in zip(bars, vals):
            if v is None:
                continue
            ax.text(bar.get_x() + bar.get_width() / 2,
                    bar.get_height() + (0.01 if percent else 0.02),
                    fmt(v), ha="center", va="bottom", fontsize=9)

    ax.set_xticks(x)
    ax.set_xticklabels([f[2] for f in families])
    ax.set_ylabel(ylabel)
    ax.grid(True, axis="y", alpha=0.25)
    ax.spines["top"].set_visible(False)
    ax.spines["right"].set_visible(False)
    ax.legend(loc="best", frameon=True, framealpha=0.9)


def fig3_ffs_distribution(results: List[dict], output_path: str, title_suffix: str = ""):
    """Figure 3: First Failure Step — grouped (base, restored) bars per method."""
    fig, ax = plt.subplots(figsize=(8, 5))

    def get_ffs(r):
        if not r:
            return None
        v = r.get("avg_ffs", None)
        if v is None or v == float("inf"):
            return None
        return v

    _plot_paired_bars(ax, results, get_ffs, ylabel="Avg first failure step")

    title = "Where does reasoning first break? (higher = better)"
    if title_suffix:
        title = f"{title}\n{title_suffix}"
    ax.set_title(title)

    plt.savefig(output_path)
    plt.close()
    print(f"  Fig 3 saved: {output_path}")


def fig4_accuracy_degradation(results: List[dict], fp16_acc: float, output_path: str, title_suffix: str = ""):
    """Figure 4: Accuracy — grouped (base, restored) bars per method, with FP16 line."""
    fig, ax = plt.subplots(figsize=(8, 5))

    def get_acc(r):
        return r.get("accuracy") if r else None

    _plot_paired_bars(ax, results, get_acc, ylabel="Accuracy", percent=True)

    if fp16_acc is not None:
        ax.axhline(y=fp16_acc, color=COLORS["fp16"], linestyle="--",
                   linewidth=1.5, alpha=0.8, label="FP16 reference")
        # Re-draw legend so the FP16 line is included.
        ax.legend(loc="best", frameon=True, framealpha=0.9)

    ax.set_ylim(0, max(1.0, (ax.get_ylim()[1] or 0) + 0.05))

    title = "Accuracy — quantized vs restored (higher = better)"
    if title_suffix:
        title = f"{title}\n{title_suffix}"
    ax.set_title(title)

    plt.savefig(output_path)
    plt.close()
    print(f"  Fig 4 saved: {output_path}")


def fig5_cascade_rate(results: List[dict], output_path: str, title_suffix: str = ""):
    """Figure 5: Error Cascade Rate — grouped (base, restored) bars per method."""
    fig, ax = plt.subplots(figsize=(8, 5))

    def get_ecr(r):
        return r.get("ecr") if r else None

    _plot_paired_bars(ax, results, get_ecr, ylabel="Error cascade rate", percent=True)
    ax.set_ylim(0, 1.05)

    title = "Once reasoning breaks, how badly does it cascade? (lower = better)"
    if title_suffix:
        title = f"{title}\n{title_suffix}"
    ax.set_title(title)

    plt.savefig(output_path)
    plt.close()
    print(f"  Fig 5 saved: {output_path}")


def fig6_restoration_comparison(before: dict, after: dict, output_path: str):
    """
    Figure 6: Before/after restoration for a single quantization method.
    Uses the paired colors from COLORS so the "before" and "after" bars match
    the hue used for that method in figs 3/4/5.
    """
    metrics = ["accuracy", "avg_ffs", "ecr"]
    labels = ["Accuracy", "Avg FFS\n(higher = better)", "ECR\n(lower = better)"]

    before_vals = [before.get(m, 0) for m in metrics]
    after_vals = [after.get(m, 0) for m in metrics]

    base_q = before.get("quantization", "gptq_w4")
    rest_q = after.get("quantization", f"{base_q}_restored")
    bar_colors = [COLORS.get(base_q, "#888888"), COLORS.get(rest_q, "#BBBBBB")]

    fig, axes = plt.subplots(1, 3, figsize=(12, 4))

    for i, (ax, label, bv, av) in enumerate(zip(axes, labels, before_vals, after_vals)):
        vals = [bv, av]
        bars = ax.bar([0, 1], vals, color=bar_colors, width=0.55, edgecolor="white")

        ax.set_xticks([0, 1])
        ax.set_xticklabels([_pretty_label(base_q), _pretty_label(rest_q)])
        ax.set_title(label)
        ax.grid(True, axis="y", alpha=0.25)
        ax.spines["top"].set_visible(False)
        ax.spines["right"].set_visible(False)

        for bar, v in zip(bars, vals):
            fmt = f"{v:.1%}" if i != 1 else f"{v:.2f}"
            ax.text(bar.get_x() + bar.get_width() / 2, bar.get_height() + 0.01,
                    fmt, ha="center", va="bottom", fontsize=10)

    plt.suptitle(f"Restoration effect: {_pretty_label(base_q)} → {_pretty_label(rest_q)}",
                 fontsize=13, y=1.02)
    plt.tight_layout()
    plt.savefig(output_path)
    plt.close()
    print(f"  Fig 6 saved: {output_path}")


def generate_all_figures(metrics_dir: str, output_dir: str, fp16_acc: float = 0.85,
                         model_filter: str = None, benchmark_filter: str = None):
    """Generate figures grouped by (model, benchmark).

    Each group produces one set of figures under output_dir/<model>/<benchmark>/
    so that the quantization lines/bars on each plot compare apples-to-apples
    (same model, same benchmark).

    If model_filter/benchmark_filter are set, only matching groups are rendered.
    """
    from collections import defaultdict

    os.makedirs(output_dir, exist_ok=True)

    results = load_all_metrics(metrics_dir)
    if not results:
        print("No metrics found. Run the evaluation pipeline first.")
        print(f"  Expected: {metrics_dir}/*_metrics.json")
        return

    print(f"Loaded {len(results)} metric files")

    # Group by (model, benchmark). Without grouping, a single figure mixed
    # together entries from every model and every benchmark and was unreadable.
    groups = defaultdict(list)
    for r in results:
        model = r.get("model", "unknown") or "unknown"
        bench = r.get("benchmark", "unknown") or "unknown"
        if model_filter and model != model_filter:
            continue
        if benchmark_filter and bench != benchmark_filter:
            continue
        groups[(model, bench)].append(r)

    if not groups:
        print("No metric files matched the given --model/--benchmark filters.")
        return

    for (model, bench), group in sorted(groups.items()):
        subdir = os.path.join(output_dir, model, bench)
        os.makedirs(subdir, exist_ok=True)
        suffix = f"{model} · {bench}"
        print(f"\n[{model} / {bench}] {len(group)} quant variants")

        fig1_ssr_curves(group, os.path.join(subdir, "fig1_ssr_curves.pdf"), title_suffix=suffix)
        fig2_error_type_heatmap(group, os.path.join(subdir, "fig2_error_heatmap.pdf"), title_suffix=suffix)
        fig3_ffs_distribution(group, os.path.join(subdir, "fig3_ffs_distribution.pdf"), title_suffix=suffix)
        fig4_accuracy_degradation(group, fp16_acc, os.path.join(subdir, "fig4_accuracy_degradation.pdf"), title_suffix=suffix)
        fig5_cascade_rate(group, os.path.join(subdir, "fig5_cascade_rate.pdf"), title_suffix=suffix)

        # Fig 6: before/after restoration within this (model, benchmark).
        for r in group:
            q = r.get("quantization", "")
            if not q.endswith("_restored"):
                continue
            base_q = q[: -len("_restored")]
            before = next((x for x in group if x.get("quantization") == base_q), None)
            if before:
                out = os.path.join(subdir, f"fig6_restoration_{base_q}.pdf")
                fig6_restoration_comparison(before, r, out)

    print(f"\nAll figures saved under {output_dir}/<model>/<benchmark>/")


# ============================================================
# Demo with synthetic data (for testing)
# ============================================================

def generate_demo_figures(output_dir: str):
    """Generate demo figures with synthetic data for testing the visualization."""
    os.makedirs(output_dir, exist_ok=True)

    # Synthetic results
    demo_results = [
        {
            "model": "DeepSeek-R1-Distill-Qwen-7B",
            "quantization": "awq_w4",
            "accuracy": 0.72,
            "accuracy_delta": -0.13,
            "avg_ffs": 3.2,
            "median_ffs": 3.0,
            "ffs_std": 1.8,
            "ecr": 0.78,
            "ssr_curve": [0.95, 0.88, 0.79, 0.68, 0.55, 0.45, 0.38, 0.32, 0.28, 0.25,
                          0.23, 0.21, 0.20, 0.19, 0.18, 0.17, 0.16, 0.15, 0.14, 0.13],
            "error_type_dist": {"conceptual": 0.12, "methodological": 0.25, "executional": 0.48, "logical": 0.15},
        },
        {
            "model": "DeepSeek-R1-Distill-Qwen-7B",
            "quantization": "awq_w3",
            "accuracy": 0.58,
            "accuracy_delta": -0.27,
            "avg_ffs": 2.1,
            "median_ffs": 2.0,
            "ffs_std": 1.3,
            "ecr": 0.89,
            "ssr_curve": [0.90, 0.75, 0.58, 0.42, 0.30, 0.22, 0.17, 0.14, 0.12, 0.10,
                          0.09, 0.08, 0.07, 0.06, 0.05, 0.05, 0.04, 0.04, 0.03, 0.03],
            "error_type_dist": {"conceptual": 0.28, "methodological": 0.22, "executional": 0.35, "logical": 0.15},
        },
        {
            "model": "DeepSeek-R1-Distill-Qwen-7B",
            "quantization": "gptq_w4",
            "accuracy": 0.74,
            "accuracy_delta": -0.11,
            "avg_ffs": 3.5,
            "median_ffs": 3.0,
            "ffs_std": 2.0,
            "ecr": 0.75,
            "ssr_curve": [0.96, 0.90, 0.82, 0.72, 0.60, 0.50, 0.42, 0.36, 0.31, 0.27,
                          0.24, 0.22, 0.20, 0.19, 0.18, 0.17, 0.16, 0.15, 0.14, 0.13],
            "error_type_dist": {"conceptual": 0.10, "methodological": 0.20, "executional": 0.55, "logical": 0.15},
        },
        {
            "model": "DeepSeek-R1-Distill-Qwen-7B",
            "quantization": "bnb_nf4",
            "accuracy": 0.70,
            "accuracy_delta": -0.15,
            "avg_ffs": 3.0,
            "median_ffs": 3.0,
            "ffs_std": 1.9,
            "ecr": 0.80,
            "ssr_curve": [0.94, 0.86, 0.76, 0.64, 0.52, 0.42, 0.35, 0.30, 0.26, 0.23,
                          0.21, 0.19, 0.18, 0.17, 0.16, 0.15, 0.14, 0.13, 0.12, 0.11],
            "error_type_dist": {"conceptual": 0.15, "methodological": 0.23, "executional": 0.45, "logical": 0.17},
        },
    ]

    fig1_ssr_curves(demo_results, os.path.join(output_dir, "fig1_ssr_curves.png"))
    fig2_error_type_heatmap(demo_results, os.path.join(output_dir, "fig2_error_heatmap.png"))
    fig3_ffs_distribution(demo_results, os.path.join(output_dir, "fig3_ffs_distribution.png"))
    fig4_accuracy_degradation(demo_results, 0.85, os.path.join(output_dir, "fig4_accuracy_degradation.png"))
    fig5_cascade_rate(demo_results, os.path.join(output_dir, "fig5_cascade_rate.png"))

    # Demo restoration
    before = demo_results[2]  # gptq_w4
    after = {"accuracy": 0.82, "avg_ffs": 5.1, "ecr": 0.45}
    fig6_restoration_comparison(before, after, os.path.join(output_dir, "fig6_restoration.png"))

    print(f"\nDemo figures saved to {output_dir}")


if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(description="Generate paper figures")
    parser.add_argument("--metrics", default=None, help="Metrics directory")
    parser.add_argument("--output", default="figures/", help="Output directory")
    parser.add_argument("--fp16-acc", type=float, default=0.85)
    parser.add_argument("--model", default=None, help="Only render figures for this model tag")
    parser.add_argument("--benchmark", default=None, help="Only render figures for this benchmark")
    parser.add_argument("--demo", action="store_true", help="Generate demo figures with synthetic data")
    args = parser.parse_args()

    if args.demo:
        generate_demo_figures(args.output)
    elif args.metrics:
        generate_all_figures(args.metrics, args.output, fp16_acc=args.fp16_acc,
                             model_filter=args.model, benchmark_filter=args.benchmark)
    else:
        print("Specify --metrics <dir> or --demo")