import os
import subprocess
import sys
import argparse
import time

sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))

KB = 1024
MB = 1024 * 1024
GB = 1024 * 1024 * 1024


def check_and_install_zipnn():
    try:
        import zipnn
    except ImportError:
        print("zipnn not found. Installing...")
        subprocess.check_call(
            [
                sys.executable,
                "-m",
                "pip",
                "install",
                "zipnn",
                "--upgrade",
            ]
        )
        import zipnn


def parse_streaming_chunk_size(
    streaming_chunk_size,
):
    if str(streaming_chunk_size).isdigit():
        final = int(streaming_chunk_size)
    else:
        size_value = int(streaming_chunk_size[:-2])
        size_unit = streaming_chunk_size[-2].lower()

        if size_unit == "k":
            final = KB * size_value
        elif size_unit == "m":
            final = MB * size_value
        elif size_unit == "g":
            final = GB * size_value
        else:
            raise ValueError(f"Invalid size unit: {size_unit}. Use 'k', 'm', or 'g'.")

    return final


def compress_file(
    input_file,
    dtype="",
    streaming_chunk_size=1048576,
    delete=False,
    force=False,
):
    import zipnn

    streaming_chunk_size = parse_streaming_chunk_size(streaming_chunk_size)
    full_path = input_file
    if not os.path.exists(full_path):
        print("File not found")
        return
    if delete:
        print(f"Deleting {full_path}...")
        os.remove(full_path)
    else:
        compressed_path = full_path + ".znn"
        if not force and os.path.exists(compressed_path):
            user_input = (
                input(f"{compressed_path} already exists; overwrite (y/n)? ").strip().lower()
            )
            if user_input not in ("yes", "y"):
                print(f"Skipping {full_path}...")
                return
        print(f"Compressing {full_path}...")
        #
        output_file = input_file + ".znn"
        if dtype:
            zpn = zipnn.ZipNN(
                bytearray_dtype="float32",
                is_streaming=True,
                streaming_chunk_kb=streaming_chunk_size,
            )
        else:
            zpn = zipnn.ZipNN(
                is_streaming=True,
                streaming_chunk_kb=streaming_chunk_size,
            )
        file_size_before = 0
        file_size_after = 0
        start_time = time.time()
        with open(input_file, "rb") as infile, open(output_file, "wb") as outfile:
            chunk = infile.read()
            file_size_before += len(chunk)
            compressed_chunk = zpn.compress(chunk)
            if compressed_chunk:
                file_size_after += len(compressed_chunk)
                outfile.write(compressed_chunk)
        end_time = time.time() - start_time
        print(f"Compressed {input_file} to {output_file}")
        print(
            f"Original size:  {file_size_before/GB:.02f}GB size after compression: {file_size_after/GB:.02f}GB, Remaining size is {file_size_after/file_size_before*100:.02f}% of original, time: {end_time:.02f}"
        )


if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: python compress_files.py <suffix>")
        print("Example: python compress_files.py 'safetensors'")
        sys.exit(1)

    parser = argparse.ArgumentParser(description="Enter a file path to compress.")
    parser.add_argument(
        "input_file",
        type=str,
        help="Specify the path to the file to compress.",
    )
    parser.add_argument(
        "--float32",
        action="store_true",
        help="A flag that triggers float32 compression",
    )
    parser.add_argument(
        "--streaming_chunk_size",
        type=str,
        help="An optional streaming chunk size. The format is int (for size in Bytes) or int+KB/MB/GB. Default is 1MB",
    )
    parser.add_argument(
        "--delete",
        action="store_true",
        help="A flag that triggers deletion of a single file instead of compression",
    )
    parser.add_argument(
        "--force",
        action="store_true",
        help="A flag that forces overwriting when compressing.",
    )
    args = parser.parse_args()
    optional_kwargs = {}
    if args.float32:
        optional_kwargs["dtype"] = 32
    if args.streaming_chunk_size is not None:
        optional_kwargs["streaming_chunk_size"] = args.streaming_chunk_size
    if args.delete:
        optional_kwargs["delete"] = args.delete
    if args.force:
        optional_kwargs["force"] = args.force

    check_and_install_zipnn()
    compress_file(args.input_file, **optional_kwargs)