"""
accuracy_chart.py - Generate accuracy charts for swap_analysis from saved JSON data.

Reads per-scale pred_stats_{scale}.json and category_validity_{scale}.json
from results/{model}/json/ and saves plots to results/{model}/plots/accuracy/.

Output files per model:
  accuracy_chart.png          - combined summary (all panels)
  accuracy_group_bars.png     - per-group (orig/swap/both) bar chart across scales
  accuracy_trajectory.png     - both-correct trajectory line plot across scales
  accuracy_category.png       - per-category accuracy (orig vs swap) across scales

Processes all models and all available scales by default.

Usage:
    python accuracy_chart.py
"""

import os
import json
import re
import numpy as np
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

RESULTS_DIR = os.path.join(os.path.dirname(__file__), 'results')

SCALE_ORDER    = ['vanilla', '80k', '400k', '800k', '2m', 'roborefer']
GROUP_ORDER    = ['horizontal', 'vertical', 'distance']
CATEGORY_ORDER = ['left', 'right', 'above', 'under', 'far', 'close']

SCALE_COLORS = {
    'vanilla':  '#1f77b4',
    '80k':      '#ff7f0e',
    '400k':     '#2ca02c',
    '800k':     '#d62728',
    '2m':       '#9467bd',
    'roborefer':'#8c564b',
}
GROUP_COLORS = {
    'horizontal': '#2ca02c',
    'vertical':   '#ff7f0e',
    'distance':   '#9467bd',
}
# Category colors: same as pca_3d.py / pca_2d_recolor.py
CAT_COLORS = {
    'left':  '#2ca02c', 'right':  '#98df8a',
    'above': '#ff7f0e', 'under':  '#ffbb78',
    'far':   '#9467bd', 'close':  '#c5b0d5',
}


# ── Data loading ──────────────────────────────────────────────────────────────

def load_pred_stats(json_dir):
    """Load all pred_stats_{scale}.json files. Returns list of dicts."""
    records = []
    for fname in os.listdir(json_dir):
        m = re.match(r'pred_stats_(.+)\.json$', fname)
        if not m:
            continue
        scale = m.group(1)
        with open(os.path.join(json_dir, fname)) as f:
            data = json.load(f)
        data['scale'] = scale
        records.append(data)
    return records


def load_category_validity(json_dir):
    """Load all category_validity_{scale}.json files. Returns {scale: dict}."""
    result = {}
    for fname in os.listdir(json_dir):
        m = re.match(r'category_validity_(.+)\.json$', fname)
        if not m:
            continue
        scale = m.group(1)
        with open(os.path.join(json_dir, fname)) as f:
            result[scale] = json.load(f)
    return result


# ── Individual plots ──────────────────────────────────────────────────────────

def plot_group_bars(pred_stats, model_type, ax_list):
    """
    Draw per-group (orig/swap/both) grouped bar chart across scales.
    ax_list: list of 3 Axes (one per group).
    """
    available = [s for s in SCALE_ORDER if any(d['scale'] == s for d in pred_stats)]
    x = np.arange(3)  # orig, swap, both
    width = 0.8 / max(len(available), 1)

    for idx, group in enumerate(GROUP_ORDER):
        ax = ax_list[idx]
        for i, scale in enumerate(available):
            entry = next((d for d in pred_stats if d['scale'] == scale), None)
            if entry is None:
                continue
            vals = [
                entry.get(f'{group}_acc_orig', 0),
                entry.get(f'{group}_acc_swap', 0),
                entry.get(f'{group}_acc_both', 0),
            ]
            offset = (i - len(available) / 2 + 0.5) * width
            ax.bar(x + offset, vals, width,
                   label=scale, color=SCALE_COLORS.get(scale, 'gray'), alpha=0.85)
        ax.set_xticks(x)
        ax.set_xticklabels(['orig', 'swap', 'both'], fontsize=10)
        ax.set_ylabel('Accuracy', fontsize=9)
        ax.set_title(f'{group.capitalize()}', fontweight='bold', fontsize=11,
                     color=GROUP_COLORS.get(group, 'black'))
        ax.legend(fontsize=7, ncol=2)
        ax.set_ylim(0, 1.15)
        ax.axhline(y=0.5, color='gray', linestyle='--', alpha=0.5, linewidth=1)
        ax.grid(True, alpha=0.3, axis='y')


def plot_both_trajectory(pred_stats, model_type, ax):
    """Line plot: acc_both per group across scales."""
    available = [s for s in SCALE_ORDER if any(d['scale'] == s for d in pred_stats)]
    x_ticks = range(len(available))

    for group in GROUP_ORDER:
        y_vals = []
        for scale in available:
            entry = next((d for d in pred_stats if d['scale'] == scale), None)
            y_vals.append(entry.get(f'{group}_acc_both', 0) if entry else 0)
        ax.plot(x_ticks, y_vals, '-o',
                color=GROUP_COLORS.get(group, 'gray'),
                label=group, linewidth=2.5, markersize=7)

    # Overall both-correct
    y_overall = []
    for scale in available:
        entry = next((d for d in pred_stats if d['scale'] == scale), None)
        y_overall.append(entry.get('overall_acc_both', 0) if entry else 0)
    ax.plot(x_ticks, y_overall, '--s',
            color='black', label='overall', linewidth=2, markersize=6, alpha=0.7)

    ax.set_xticks(list(x_ticks))
    ax.set_xticklabels(available, fontsize=9)
    ax.set_xlabel('Scale', fontsize=9)
    ax.set_ylabel('Accuracy (both correct)', fontsize=9)
    ax.set_title('Both-Correct Accuracy Trajectory', fontweight='bold', fontsize=11)
    ax.legend(fontsize=9)
    ax.set_ylim(0, 1.05)
    ax.axhline(y=0.5, color='gray', linestyle='--', alpha=0.5, linewidth=1)
    ax.grid(True, alpha=0.3)


def plot_overall_trajectory(pred_stats, model_type, ax):
    """Line plot: overall acc_orig/acc_swap/acc_both across scales."""
    available = [s for s in SCALE_ORDER if any(d['scale'] == s for d in pred_stats)]
    x_ticks = range(len(available))

    for metric, label, ls in [
        ('overall_acc_orig', 'orig', '-o'),
        ('overall_acc_swap', 'swap', '-s'),
        ('overall_acc_both', 'both', '-^'),
    ]:
        y_vals = []
        for scale in available:
            entry = next((d for d in pred_stats if d['scale'] == scale), None)
            y_vals.append(entry.get(metric, 0) if entry else 0)
        ax.plot(x_ticks, y_vals, ls, label=label, linewidth=2.2, markersize=6)

    ax.set_xticks(list(x_ticks))
    ax.set_xticklabels(available, fontsize=9)
    ax.set_xlabel('Scale', fontsize=9)
    ax.set_ylabel('Overall Accuracy', fontsize=9)
    ax.set_title('Overall Accuracy Trajectory', fontweight='bold', fontsize=11)
    ax.legend(fontsize=9)
    ax.set_ylim(0, 1.05)
    ax.axhline(y=0.5, color='gray', linestyle='--', alpha=0.5, linewidth=1)
    ax.grid(True, alpha=0.3)


def plot_category_accuracy(cat_validity, model_type, ax_orig, ax_swap, pred_stats=None):
    """
    Heatmap-style grouped bars: per-category + overall acc_orig and acc_swap across scales.
    ax_orig: Axes for acc_orig, ax_swap: Axes for acc_swap.
    """
    available = [s for s in SCALE_ORDER if s in cat_validity]
    cats_with_overall = CATEGORY_ORDER + ['overall']
    x = np.arange(len(cats_with_overall))
    width = 0.8 / max(len(available), 1)

    # overall metric keys in pred_stats
    overall_metric = {'acc_orig': 'overall_acc_orig', 'acc_swap': 'overall_acc_swap'}

    for ax, metric, title in [
        (ax_orig, 'acc_orig', 'Per-Category Accuracy (orig)'),
        (ax_swap, 'acc_swap', 'Per-Category Accuracy (swap)'),
    ]:
        for i, scale in enumerate(available):
            cv = cat_validity[scale]
            vals = [cv.get(cat, {}).get(metric, 0) for cat in CATEGORY_ORDER]
            # Append overall value
            if pred_stats is not None:
                entry = next((d for d in pred_stats if d['scale'] == scale), None)
                vals.append(entry.get(overall_metric[metric], 0) if entry else 0)
            else:
                vals.append(0)
            offset = (i - len(available) / 2 + 0.5) * width
            ax.bar(x + offset, vals, width,
                   label=scale, color=SCALE_COLORS.get(scale, 'gray'), alpha=0.85)

        # Shade per-category bars by group (background tint)
        for j, cat in enumerate(CATEGORY_ORDER):
            c = CAT_COLORS.get(cat, 'gray')
            ax.axvspan(j - 0.45, j + 0.45, color=c, alpha=0.06, linewidth=0)

        # Vertical separator between categories and overall
        sep = len(CATEGORY_ORDER) - 0.5
        ax.axvline(x=sep, color='black', linewidth=1.2, linestyle=':', alpha=0.6)

        ax.set_xticks(x)
        ax.set_xticklabels(cats_with_overall, fontsize=9, rotation=15)
        ax.set_ylabel('Accuracy', fontsize=9)
        ax.set_title(title, fontweight='bold', fontsize=11)
        ax.legend(fontsize=7, ncol=2)
        ax.set_ylim(0, 1.15)
        ax.axhline(y=0.5, color='gray', linestyle='--', alpha=0.5, linewidth=1)
        ax.grid(True, alpha=0.3, axis='y')

        # Mark reliable/unreliable for last available scale (as reference)
        if available:
            last_scale = available[-1]
            cv = cat_validity[last_scale]
            for j, cat in enumerate(CATEGORY_ORDER):
                reliable = cv.get(cat, {}).get('reliable', True)
                if not reliable:
                    ax.text(j, 1.08, '✗', ha='center', va='center',
                            fontsize=9, color='red', fontweight='bold')


# ── Per-scale category bar chart ──────────────────────────────────────────────

def plot_category_per_scale(cat_validity, model_type, save_dir, pred_stats=None):
    """
    One figure per scale: side-by-side acc_orig and acc_swap per category + overall.
    Saves category_accuracy_{scale}.png.
    """
    overall_metric = {'acc_orig': 'overall_acc_orig', 'acc_swap': 'overall_acc_swap'}
    cats_with_overall = CATEGORY_ORDER + ['overall']

    for scale in sorted(cat_validity.keys(), key=lambda s: SCALE_ORDER.index(s) if s in SCALE_ORDER else 99):
        cv = cat_validity[scale]
        ps_entry = next((d for d in pred_stats if d['scale'] == scale), None) if pred_stats else None

        fig, axes = plt.subplots(1, 2, figsize=(16, 5))
        x = np.arange(len(cats_with_overall))
        width = 0.55

        for ax, metric, title in [
            (axes[0], 'acc_orig', f'acc_orig  ({scale})'),
            (axes[1], 'acc_swap', f'acc_swap  ({scale})'),
        ]:
            vals = [cv.get(cat, {}).get(metric, 0) for cat in CATEGORY_ORDER]
            overall_val = ps_entry.get(overall_metric[metric], 0) if ps_entry else 0
            vals.append(overall_val)
            colors = [CAT_COLORS.get(cat, 'gray') for cat in CATEGORY_ORDER] + ['#333333']
            bars = ax.bar(x, vals, width, color=colors, alpha=0.85, edgecolor='white')

            # Separator before overall
            ax.axvline(x=len(CATEGORY_ORDER) - 0.5, color='black', linewidth=1.2,
                       linestyle=':', alpha=0.6)

            ax.set_xticks(x)
            ax.set_xticklabels(cats_with_overall, fontsize=10)
            ax.set_ylabel('Accuracy', fontsize=10)
            ax.set_title(title, fontweight='bold', fontsize=12)
            ax.set_ylim(0, 1.15)
            ax.axhline(y=0.5, color='gray', linestyle='--', alpha=0.5)
            ax.grid(True, alpha=0.3, axis='y')
            for j, (bar, cat) in enumerate(zip(bars, cats_with_overall)):
                reliable = cv.get(cat, {}).get('reliable', True) if cat != 'overall' else True
                h = bar.get_height()
                ax.text(bar.get_x() + bar.get_width() / 2, h + 0.02,
                        f'{h:.2f}' + ('' if reliable else ' ✗'),
                        ha='center', va='bottom', fontsize=8,
                        color='red' if not reliable else 'black')

        fig.suptitle(f'{model_type.upper()} - Category Accuracy  ({scale})',
                     fontsize=13, fontweight='bold')
        plt.tight_layout()
        out = os.path.join(save_dir, f'category_accuracy_{scale}.png')
        plt.savefig(out, dpi=200, bbox_inches='tight')
        plt.close()
        print(f"  Saved {out}")


# ── Main chart builders ───────────────────────────────────────────────────────

def save_accuracy_group_bars(pred_stats, model_type, save_dir):
    fig, axes = plt.subplots(1, 3, figsize=(21, 6))
    plot_group_bars(pred_stats, model_type, axes)
    fig.suptitle(f'{model_type.upper()} - Prediction Accuracy by Group',
                 fontsize=15, fontweight='bold')
    plt.tight_layout()
    out = os.path.join(save_dir, 'accuracy_group_bars.png')
    plt.savefig(out, dpi=200, bbox_inches='tight')
    plt.close()
    print(f"  Saved {out}")


def save_accuracy_trajectory(pred_stats, model_type, save_dir):
    fig, axes = plt.subplots(1, 2, figsize=(16, 6))
    plot_both_trajectory(pred_stats, model_type, axes[0])
    plot_overall_trajectory(pred_stats, model_type, axes[1])
    fig.suptitle(f'{model_type.upper()} - Accuracy Trajectory Across Scales',
                 fontsize=14, fontweight='bold')
    plt.tight_layout()
    out = os.path.join(save_dir, 'accuracy_trajectory.png')
    plt.savefig(out, dpi=200, bbox_inches='tight')
    plt.close()
    print(f"  Saved {out}")


def save_accuracy_category(cat_validity, model_type, save_dir, pred_stats=None):
    fig, axes = plt.subplots(1, 2, figsize=(20, 6))
    plot_category_accuracy(cat_validity, model_type, axes[0], axes[1], pred_stats=pred_stats)
    fig.suptitle(f'{model_type.upper()} - Per-Category Accuracy Across Scales',
                 fontsize=14, fontweight='bold')
    plt.tight_layout()
    out = os.path.join(save_dir, 'accuracy_category.png')
    plt.savefig(out, dpi=200, bbox_inches='tight')
    plt.close()
    print(f"  Saved {out}")


def save_accuracy_chart(pred_stats, cat_validity, model_type, save_dir):
    """
    Combined summary figure (accuracy_chart.png):
      Row 1: group bars x3
      Row 2: both-correct trajectory | overall trajectory | (cat orig + cat swap stacked)
    Layout: 2 rows x 3 cols, last col splits into 2 sub-axes.
    """
    fig = plt.figure(figsize=(24, 14))

    # Row 1: group bars (3 cols)
    ax_h  = fig.add_subplot(3, 3, 1)
    ax_v  = fig.add_subplot(3, 3, 2)
    ax_d  = fig.add_subplot(3, 3, 3)
    plot_group_bars(pred_stats, model_type, [ax_h, ax_v, ax_d])

    # Row 2: trajectories
    ax_traj_both  = fig.add_subplot(3, 3, 4)
    ax_traj_ovr   = fig.add_subplot(3, 3, 5)
    plot_both_trajectory(pred_stats, model_type, ax_traj_both)
    plot_overall_trajectory(pred_stats, model_type, ax_traj_ovr)

    # Row 2 col 3: blank (placeholder for legend/note)
    ax_note = fig.add_subplot(3, 3, 6)
    ax_note.axis('off')
    available_scales = [s for s in SCALE_ORDER if any(d['scale'] == s for d in pred_stats)]
    note_lines = [f'Scales: {", ".join(available_scales)}',
                  '', '✗ = unreliable category', '-- = 0.5 chance level']
    ax_note.text(0.1, 0.6, '\n'.join(note_lines), transform=ax_note.transAxes,
                 fontsize=11, va='top', family='monospace')

    # Row 3: per-category accuracy (orig | swap)
    ax_cat_orig = fig.add_subplot(3, 1, 3)
    # Draw both cat panels in a sub-figure approach via twin
    # (simplified: draw orig in bottom-left half, swap in bottom-right half)
    ax_cat_orig.remove()
    ax_co = fig.add_subplot(3, 2, 5)
    ax_cs = fig.add_subplot(3, 2, 6)
    plot_category_accuracy(cat_validity, model_type, ax_co, ax_cs, pred_stats=pred_stats)

    fig.suptitle(f'{model_type.upper()} — Accuracy Summary',
                 fontsize=17, fontweight='bold', y=1.01)
    plt.tight_layout()
    out = os.path.join(save_dir, 'accuracy_chart.png')
    plt.savefig(out, dpi=200, bbox_inches='tight')
    plt.close()
    print(f"  Saved {out}")


# ── Entry point ───────────────────────────────────────────────────────────────

def main():
    if not os.path.isdir(RESULTS_DIR):
        print(f"Results directory not found: {RESULTS_DIR}")
        return

    for model in sorted(os.listdir(RESULTS_DIR)):
        model_dir = os.path.join(RESULTS_DIR, model)
        if not os.path.isdir(model_dir):
            continue

        json_dir = os.path.join(model_dir, 'json')
        if not os.path.isdir(json_dir):
            print(f"[{model}] no json/ dir, skipping")
            continue

        pred_stats   = load_pred_stats(json_dir)
        cat_validity = load_category_validity(json_dir)

        if not pred_stats:
            print(f"[{model}] no pred_stats files found, skipping")
            continue

        # Sort by scale order
        pred_stats.sort(key=lambda d: SCALE_ORDER.index(d['scale'])
                        if d['scale'] in SCALE_ORDER else 99)

        save_dir = os.path.join(model_dir, 'plots', 'accuracy')
        os.makedirs(save_dir, exist_ok=True)

        print(f"\n[{model}] scales: {[d['scale'] for d in pred_stats]}")
        save_accuracy_group_bars(pred_stats, model, save_dir)
        save_accuracy_trajectory(pred_stats, model, save_dir)
        if cat_validity:
            save_accuracy_category(cat_validity, model, save_dir, pred_stats=pred_stats)
            plot_category_per_scale(cat_validity, model, save_dir, pred_stats=pred_stats)
        save_accuracy_chart(pred_stats, cat_validity, model, save_dir)

    print("\nDone.")


if __name__ == '__main__':
    main()