#!/usr/bin/env python3

import argparse
import git
import os
import subprocess
import sys

script_dir = os.path.dirname(os.path.realpath(__file__))
root_dir = script_dir
asm_dir = os.path.join(root_dir, "asm", "nonmatchings")
build_dir = os.path.join(root_dir, "build")
elf_path = os.path.join(build_dir, "papermario.elf")

def get_func_sizes():
    try:
        result = subprocess.run(['objdump', '-x', elf_path], stdout=subprocess.PIPE)
        nm_lines = result.stdout.decode().split("\n")
    except:
        print(f"Error: Could not run objdump on {elf_path} - make sure that the project is built")
        sys.exit(1)

    sizes = {}
    total = 0

    for line in nm_lines:
        if " F " in line:
            components = line.split()
            size = int(components[4], 16)
            name = components[5]
            total += size
            sizes[name] = size

    return sizes, total

def get_nonmatching_funcs():
    funcs = set()

    for root, dirs, files in os.walk(asm_dir):
        for f in files:
            if f.endswith(".s"):
                funcs.add(f[:-2])

    return funcs

def get_funcs_sizes(sizes, matchings, nonmatchings):
    msize = 0
    nmsize = 0

    for func in matchings:
        msize += sizes[func]

    for func in nonmatchings:
        if func not in sizes:
            pass
            # print(func)
        else:
            nmsize += sizes[func]

    return msize, nmsize

def main(args):
    func_sizes, total_size = get_func_sizes()
    all_funcs = set(func_sizes.keys())

    nonmatching_funcs = get_nonmatching_funcs()
    matching_funcs = all_funcs - nonmatching_funcs

    matching_size, nonmatching_size = get_funcs_sizes(func_sizes, matching_funcs, nonmatching_funcs)

    funcs_matching_ratio = (len(matching_funcs) / len(all_funcs)) * 100
    matching_ratio = (matching_size / total_size) * 100

    if matching_size + nonmatching_size != total_size:
        print("Warning: category/total size mismatch!\n")

    if args.csv:
        version = 1
        git_object = git.Repo().head.object
        timestamp = str(git_object.committed_date)
        git_hash = git_object.hexsha
        csv_list = [str(version), timestamp, git_hash, str(len(all_funcs)), str(len(nonmatching_funcs)),
                    str(len(matching_funcs)), str(total_size), str(nonmatching_size), str(matching_size)]
        print(",".join(csv_list))
    else:
        print(f"{len(matching_funcs)} matched functions / {len(all_funcs)} total ({funcs_matching_ratio:.2f}%)")
        print(f"{matching_size} matching bytes / {total_size} total ({matching_ratio:.2f}%)")


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Reports progress for the project")
    parser.add_argument("--csv", action="store_true")
    args = parser.parse_args()

    main(args)