visualization.py

import matplotlib.pyplot as plt
import seaborn as sns
import pandas as pd
from sklearn.metrics import accuracy_score, precision_score, recall_score, f1_score, confusion_matrix

plt.rcParams['figure.facecolor'] = '#1F2937' 
plt.rcParams['axes.facecolor'] = '#0B0F19' 
plt.rcParams['text.color'] = 'white'
plt.rcParams['axes.labelcolor'] = 'white'
plt.rcParams['xtick.color'] = 'white'
plt.rcParams['ytick.color'] = 'white'   


def plot_feature_distributions(real_data, synthetic_data):
    features = real_data.columns.to_list()

    n_cols = 3
    n_rows = (len(features) + n_cols - 1) // n_cols

    fig, axes = plt.subplots(n_rows, n_cols, figsize=(18, 5 * n_rows))

    for i, feature in enumerate(features):
        row = i // n_cols
        col = i % n_cols

        sns.histplot(
            real_data[feature],
            bins=30,
            color='skyblue',
            stat='count',
            element='step',
            fill=True,
            alpha=0.2,
            ax=axes[row, col]
        )
        
        sns.histplot(
            synthetic_data[feature],
            bins=30,
            color='indianred',
            stat='count',
            element='step',
            fill=True,
            alpha=0.2,
            ax=axes[row, col]
        )
        
        axes[row, col].set_title(f'Distribution of {feature}')
        axes[row, col].set_xlabel(feature)
        axes[row, col].set_ylabel('Frequency')
        axes[row, col].legend(['Real Data', 'Synthetic Data'])

    for j in range(i + 1, n_rows * n_cols):
        fig.delaxes(axes[j // n_cols, j % n_cols])
    

    plt.tight_layout()
    return fig


def get_metrics_df(y_true, y_real_pred, y_synth_pred):
    metrics = {
        'Model': ['Real Data Model', 'Synthetic Data Model'],
        'Accuracy': [
            accuracy_score(y_true, y_real_pred),
            accuracy_score(y_true, y_synth_pred)
        ],
        'Precision': [
            precision_score(y_true, y_real_pred, average='weighted'),
            precision_score(y_true, y_synth_pred, average='weighted')
        ],
        'Recall': [
            recall_score(y_true, y_real_pred, average='weighted'),
            recall_score(y_true, y_synth_pred, average='weighted')
        ],
        'F1-Score': [
            f1_score(y_true, y_real_pred, average='weighted'),
            f1_score(y_true, y_synth_pred, average='weighted')
        ]
    }
    return pd.DataFrame(metrics)


def plot_comparative_credit_score_distribution(
    real_scores,
    synth_scores,
    bins=50,
    title='Comparative Credit Score Distribution: Real vs Synthetic Models'
):
    fig, axes = plt.subplots(1, 2, figsize=(16, 5), sharey=True)

    sns.histplot(
        real_scores,
        bins=bins,
        stat='count',
        element='step',
        fill=True,
        alpha=0.2,
        color='skyblue',
        ax=axes[0]
    )
    axes[0].set_title('Real-Data Model Score Distribution')
    axes[0].set_xlabel('Predicted Credit Score')
    axes[0].set_ylabel('Frequency')

    sns.histplot(
        synth_scores,
        bins=bins,
        stat='count',
        element='step',
        fill=True,
        alpha=0.2,
        color='skyblue',
        ax=axes[1]
    )
    axes[1].set_title('Synthetic-Data Model Score Distribution')
    axes[1].set_xlabel('Predicted Credit Score')
    axes[1].set_ylabel('Frequency')

    plt.tight_layout()
    return fig


def plot_comparison_table(
        y_true, y_real_pred, y_synth_pred, 
        title='Model Comparison: Real Data vs Synthetic Data'
):
    metrics_df = get_metrics_df(y_true, y_real_pred, y_synth_pred)
    display_df = metrics_df.copy().round(4).set_index('Model')

    fig, ax = plt.subplots(figsize=(18, 2))
    ax.axis('off')

    table = ax.table(
        cellText=display_df.values,
        rowLabels=display_df.index,
        colLabels=display_df.columns,
        cellLoc='center',
        loc='center',
    )
    table.auto_set_font_size(False)
    table.set_fontsize(16)
    table.scale(1.2, 1.9)

    for j in range(len(display_df.columns)):
        table[(0, j)].set_facecolor('#1F77B4')
        table[(0, j)].set_text_props(color='white', weight='bold')

        table[(0, j)].set_edgecolor('white')
        table[(0, j)].set_linewidth(1)

    for i in range(1, len(display_df.index) + 1):
        bg = '#0B0F19' if i % 2 else '#0B0F19'

        table[(i, -1)].set_text_props(color='white', weight='bold')
        table[(i, -1)].set_facecolor(bg)
        table[(i, -1)].set_edgecolor('white')
        table[(i, -1)].set_linewidth(1)

        for j in range(len(display_df.columns)):
            table[(i, j)].set_facecolor(bg)
            table[(i, j)].set_text_props(color='white')
            table[(i, j)].set_edgecolor('white')
            table[(i, j)].set_linewidth(1)

    plt.tight_layout()
    return fig


def plot_comparative_confusion_matrices(
    y_true,
    y_pred_real,
    y_pred_synth,
    labels=None,
    normalize=False,
    cmap='Blues'
):
    cm_real = confusion_matrix(y_true, y_pred_real, labels=labels)
    cm_synth = confusion_matrix(y_true, y_pred_synth, labels=labels)

    if normalize:
        cm_real_plot = cm_real.astype(float) / cm_real.sum(axis=1, keepdims=True)
        cm_synth_plot = cm_synth.astype(float) / cm_synth.sum(axis=1, keepdims=True)
        fmt = '.2f'
    else:
        cm_real_plot = cm_real
        cm_synth_plot = cm_synth
        fmt = 'd'

    fig, axes = plt.subplots(1, 2, figsize=(16, 6))

    sns.heatmap(
        cm_real_plot, annot=True, fmt=fmt, cmap=cmap,
        xticklabels=labels, yticklabels=labels, ax=axes[0]
    )
    axes[0].set_title(f"Real Data Confusion Matrix")
    axes[0].set_xlabel("Predicted")
    axes[0].set_ylabel("Actual")

    sns.heatmap(
        cm_synth_plot, annot=True, fmt=fmt, cmap=cmap,
        xticklabels=labels, yticklabels=labels, ax=axes[1]
    )
    axes[1].set_title(f"Synthetic Data Confusion Matrix")
    axes[1].set_xlabel("Predicted")
    axes[1].set_ylabel("Actual")

    plt.tight_layout()
    return fig


def plot_comparative_credit_score_distribution_by_actual_class(
    y_true,
    real_scores,
    synth_scores,
    color_map,
    label_order=None,
    bins=50,
):
    fig, (ax_left, ax_right) = plt.subplots(1, 2, figsize=(16, 5), sharey=True)

    y_true_arr = pd.Series(y_true).values

    for label in label_order:
        mask = (y_true_arr == label)

        sns.histplot(
            real_scores[mask],
            bins=bins,
            stat='count',
            element='step',
            fill=True,
            alpha=0.2,
            color=color_map.get(label, None),
            label=label,
            ax=ax_left
        )

        sns.histplot(
            synth_scores[mask],
            bins=bins,
            stat='count',
            element='step',
            fill=True,
            alpha=0.2,
            color=color_map.get(label, None),
            label=label,
            ax=ax_right
        )

    ax_left.set_title('Real-Data Model: Actual Class Distribution')
    ax_left.set_xlabel('Predicted Credit Score')
    ax_left.set_ylabel('Frequency')
    ax_left.legend(title='Actual Class')

    ax_right.set_title('Synthetic-Data Model: Actual Class Distribution')
    ax_right.set_xlabel('Predicted Credit Score')
    ax_right.set_ylabel('Frequency')
    ax_right.legend(title='Actual Class')

    plt.tight_layout()
    return fig


def plot_evaluation_table(summary_df, title="Synthetic Data Evaluation Summary"):
    display_df = summary_df.copy().round(4)

    fig, ax = plt.subplots(figsize=(18, 2))
    ax.axis("off")

    table = ax.table(
        cellText  = display_df.values,
        rowLabels = display_df.index,
        colLabels = display_df.columns,
        cellLoc   = "center",
        loc       = "center",
    )
    table.auto_set_font_size(False)
    table.set_fontsize(16)
    table.scale(1.2, 1.9)

    for j in range(len(display_df.columns)):
        table[(0, j)].set_facecolor("#1F77B4")
        table[(0, j)].set_text_props(color="white", weight="bold")
        table[(0, j)].set_edgecolor("white")
        table[(0, j)].set_linewidth(1)

    for i in range(1, len(display_df.index) + 1):
        bg = "#0B0F19"

        table[(i, -1)].set_text_props(color="white", weight="bold")
        table[(i, -1)].set_facecolor(bg)
        table[(i, -1)].set_edgecolor("white")
        table[(i, -1)].set_linewidth(1)

        for j in range(len(display_df.columns)):
            table[(i, j)].set_facecolor(bg)
            table[(i, j)].set_text_props(color="white")
            table[(i, j)].set_edgecolor("white")
            table[(i, j)].set_linewidth(1)

    ax.set_title(title, color="white", fontsize=16, weight="bold", pad=12)

    plt.tight_layout()
    return fig