from pathlib import Path

# Original class order (from Reverse_Ablation training dataset.yaml)
ORIGINAL_NAMES = {
    0: "C_Steel_Ball_L", 1: "C_Steel_Ball_S", 2: "GF_Split_Pin_L", 3: "GF_Split_Pin_S",
    4: "GF_Collar_L", 5: "GF_Collar_S", 6: "FestoI", 7: "FestoT", 8: "FestoV",
    9: "FestoX", 10: "FestoY", 11: "Festo_Torch", 12: "GF_Hexagon_F_Roll-in_Nut_M5",
    13: "F_Roll-in_Nut_M5", 14: "C_O_Ring_L", 15: "C_O_Ring_M", 16: "C_O_Ring_S",
    17: "C_Plastic_Washer_L", 18: "C_Plastic_Washer_S", 19: "GF_Plain_Screw_M8",
    20: "MM_Wood_Screw", 21: "GF_Screw_M5", 22: "GF_Knurled_Screw_M8",
    23: "MM_Silencer_L", 24: "MM_Silencer_S", 25: "GF_Cone_Screw_M8", 26: "MM_Spring",
    27: "GF_Slotted_Pin_L", 28: "GF_Slotted_Pin_S", 29: "C_Washer_M6",
    30: "C_Washer_M5", 31: "MM_Wing",
}

# inverse_permutation[true_class_index] = index the model internally predicts for that
# semantic class, derived from the confusion-matrix argmax mapping (all confidences
# reviewed above; bijection confirmed, no collisions).
inverse_permutation = {
    0: 5,   1: 6,   2: 25,  3: 26,  4: 16,  5: 17,  6: 10,  7: 11,
    8: 12,  9: 13,  10: 14, 11: 15, 12: 19, 13: 9,  14: 0,  15: 1,
    16: 2,  17: 3,  18: 4,  19: 21, 20: 31, 21: 22, 22: 20, 23: 27,
    24: 28, 25: 18, 26: 29, 27: 23, 28: 24, 29: 8,  30: 7,  31: 30,
}

# --- Sanity check: confirm bijection before touching any files ---
assert len(inverse_permutation) == 32, "Mapping must cover all 32 classes."
assert sorted(inverse_permutation.values()) == list(range(32)), (
    "Mapping is not a valid bijection. Aborting before modifying label files."
)

SRC_LABELS = Path("/media/rtx5090/IRIS_Test_Remapped/labels_original/full/rgb/")
DST_LABELS = Path("/media/rtx5090/IRIS_Test_Remapped/labels/full/rgb/")
DST_LABELS.mkdir(parents=True, exist_ok=True)

n_files = 0
n_boxes = 0

for label_file in SRC_LABELS.glob("*.txt"):
    lines_out = []
    for line in label_file.read_text().splitlines():
        if not line.strip():
            continue
        parts = line.split()
        old_idx = int(parts[0])
        new_idx = inverse_permutation[old_idx]
        lines_out.append(" ".join([str(new_idx)] + parts[1:]))
        n_boxes += 1
    (DST_LABELS / label_file.name).write_text("\n".join(lines_out) + "\n")
    n_files += 1

print(f"Remapped {n_boxes} boxes across {n_files} label files.")
print(f"Output written to: {DST_LABELS}")