import os
import shutil


def copy_images(src, dest):
    image_extensions = [".jpg", ".jpeg", ".png", ".bmp", ".gif"]

    for filename in os.listdir(src):
        if any(filename.lower().endswith(ext) for ext in image_extensions):
            src_path = os.path.join(src, filename)
            dst_path = os.path.join(dest, filename)
            shutil.copy2(src_path, dst_path)


def remap_labels(src, dest):
    count = 0
    for filename in os.listdir(src):
        if filename.endswith(".txt"):
            input_path = os.path.join(src, filename)
            output_path = os.path.join(dest, filename)

            with open(input_path, "r") as f:
                lines = f.readlines()

            new_lines = []
            for line in lines:
                parts = line.strip().split()
                old_idx = int(parts[0])
                new_idx = index_map[old_idx]
                new_lines.append(" ".join([str(new_idx)] + parts[1:]))

            with open(output_path, "w") as f:
                f.write("\n".join(new_lines))

            if count%100 == 0:
                print(count)
            count += 1

        print(f"All labels remapped and saved to '{dest}'")


if __name__ == "__main__":

    src_dir = "../datasets/pieces/visualizan/"
    dest_dir = "../datasets/pieces/unified/"

    reference_classes = [
        'w_pawn', 'w_knight', 'w_bishop', 'w_rook', 'w_queen', 'w_king',
        'b_pawn', 'b_knight', 'b_bishop', 'b_rook', 'b_queen', 'b_king'
    ]

    current_classes = ['b_bishop', 'b_king', 'b_knight', 'b_pawn', 'b_queen', 'b_rook',
        'w_bishop', 'w_king', 'w_knight', 'w_pawn', 'w_queen', 'w_rook']

    index_map = {current_classes.index(cls): reference_classes.index(cls) for cls in current_classes}

    sub_elements = os.listdir(src_dir)
    for sub in sub_elements:
        src_full_path = os.path.normpath(os.path.join(src_dir, sub))
        dest_full_path = os.path.normpath(os.path.join(dest_dir, sub))

        if not os.path.isdir(src_full_path): continue

        src_image_folder = os.path.normpath(os.path.join(src_full_path, "images"))
        src_labels_folder = os.path.normpath(os.path.join(src_full_path, "labels"))

        dst_image_folder = os.path.normpath(os.path.join(dest_full_path, "images"))
        dst_labels_folder = os.path.normpath(os.path.join(dest_full_path, "labels"))

        copy_images(src_image_folder, dst_image_folder)
        remap_labels(src_labels_folder, dst_labels_folder)