import pickle
from pathlib import Path

import matplotlib.pyplot as plt
import numpy as np
from scipy.stats import sem, t
from sklearn.metrics import auc


# Confidence interval function
def confidence_interval(data, confidence=0.95):
    n = len(data)
    mean = np.mean(data)
    std_err = sem(data)
    h = std_err * t.ppf((1 + confidence) / 2.0, n - 1)
    return mean, h


# Load ROC and AUC values from pickle files
roc_data = []
auc_scores = []
isoforest_roc_data = []
isoforest_auc_scores = []

results_path = Path(
    "/home/fedex/mt/projects/thesis-kowalczyk-jan/Deep-SAD-PyTorch/log/DeepSAD/subter_kfold_800_3000_new"
)

for i in range(5):
    with (results_path / f"results_{i}.pkl").open("rb") as f:
        data = pickle.load(f)
        roc_data.append(data["test_roc"])
        auc_scores.append(data["test_auc"])
    with (results_path / f"results_isoforest_{i}.pkl").open("rb") as f:
        data = pickle.load(f)
        isoforest_roc_data.append(data["test_roc"])
        isoforest_auc_scores.append(data["test_auc"])

# Calculate mean and confidence interval for DeepSAD AUC scores
mean_auc, auc_ci = confidence_interval(auc_scores)

# Combine ROC curves for DeepSAD
mean_fpr = np.linspace(0, 1, 100)
tprs = []

for fpr, tpr, _ in roc_data:
    interp_tpr = np.interp(mean_fpr, fpr, tpr)
    interp_tpr[0] = 0.0
    tprs.append(interp_tpr)

mean_tpr = np.mean(tprs, axis=0)
mean_tpr[-1] = 1.0
std_tpr = np.std(tprs, axis=0)

# -- ADDED: Calculate mean and confidence interval for IsoForest AUC scores
isoforest_mean_auc, isoforest_auc_ci = confidence_interval(isoforest_auc_scores)

# -- ADDED: Combine ROC curves for IsoForest
isoforest_mean_fpr = np.linspace(0, 1, 100)
isoforest_tprs = []

for fpr, tpr, _ in isoforest_roc_data:
    interp_tpr = np.interp(isoforest_mean_fpr, fpr, tpr)
    interp_tpr[0] = 0.0
    isoforest_tprs.append(interp_tpr)

isoforest_mean_tpr = np.mean(isoforest_tprs, axis=0)
isoforest_mean_tpr[-1] = 1.0
isoforest_std_tpr = np.std(isoforest_tprs, axis=0)

# Plot ROC curves with confidence margins for DeepSAD
plt.figure(figsize=(8, 6))
plt.plot(
    mean_fpr,
    mean_tpr,
    color="b",
    label=f"DeepSAD Mean ROC (AUC = {mean_auc:.2f} ± {auc_ci:.2f})",
)
plt.fill_between(
    mean_fpr,
    mean_tpr - std_tpr,
    mean_tpr + std_tpr,
    color="b",
    alpha=0.2,
    label="DeepSAD ± 1 std. dev.",
)

# -- ADDED: Plot ROC curves with confidence margins for IsoForest
plt.plot(
    isoforest_mean_fpr,
    isoforest_mean_tpr,
    color="r",
    label=f"IsoForest Mean ROC (AUC = {isoforest_mean_auc:.2f} ± {isoforest_auc_ci:.2f})",
)
plt.fill_between(
    isoforest_mean_fpr,
    isoforest_mean_tpr - isoforest_std_tpr,
    isoforest_mean_tpr + isoforest_std_tpr,
    color="r",
    alpha=0.2,
    label="IsoForest ± 1 std. dev.",
)

# Plot each fold's ROC curve (optional) for DeepSAD
for i, (fpr, tpr, _) in enumerate(roc_data):
    plt.plot(
        fpr,
        tpr,
        lw=1,
        alpha=0.3,
        color="b",
        label=f"DeepSAD Fold {i+1} ROC" if i == 0 else "",
    )

# -- ADDED: Plot each fold's ROC curve (optional) for IsoForest
for i, (fpr, tpr, _) in enumerate(isoforest_roc_data):
    plt.plot(
        fpr,
        tpr,
        lw=1,
        alpha=0.3,
        color="r",
        label=f"IsoForest Fold {i+1} ROC" if i == 0 else "",
    )

# Labels and legend
plt.plot([0, 1], [0, 1], "k--", label="Chance")
plt.xlabel("False Positive Rate")
plt.ylabel("True Positive Rate")
plt.title("ROC Curve with 5-Fold Cross-Validation")
plt.legend(loc="lower right")
plt.savefig("roc_curve_800_3000_isoforest.png")
plt.show()