#!/usr/bin/env python3

import argparse
import git
import os
import subprocess
import sys
from colour import Color

def set_version(version):
    global script_dir, root_dir, asm_dir, build_dir, elf_path
    script_dir = os.path.dirname(os.path.realpath(__file__))
    root_dir = os.path.join(script_dir, "ver", version)
    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 load_latest_progress(version):
    from urllib.request import urlopen

    if version == "current":
        from pathlib import Path

        version = Path("ver/current").resolve().parts[-1]

    csv = urlopen(f"https://papermar.io/reports/progress_{version}.csv").read().decode('utf-8')
    latest = csv.split("\n")[-2]

    version, timestamp, git_hash, all_funcs, nonmatching_funcs, matching_funcs, total_size, nonmatching_size, matching_size = latest.split(",")

    return (int(all_funcs), int(nonmatching_funcs), int(matching_funcs), int(total_size), int(nonmatching_size), int(matching_size))

def get_func_sizes():
    try:
        result = subprocess.run(['mips-linux-gnu-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 lerp(a, b, alpha):
    return a + (b - a) * alpha

def main(args):
    set_version(args.version)

    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)

    if len(all_funcs) == 0:
        funcs_matching_ratio = 0.0
        matching_ratio = 0.0
    else:
        funcs_matching_ratio = (len(matching_funcs) / len(all_funcs)) * 100
        matching_ratio = (matching_size / total_size) * 100

    old_all_funcs, old_nonmatching_funcs, old_matching_funcs, old_total_size, old_nonmatching_size, old_matching_size = load_latest_progress(args.version)
    old_matching_ratio = (old_matching_size / old_total_size) * 100

    ratio_delta = matching_ratio - old_matching_ratio
    funcs_delta = len(matching_funcs) - old_matching_funcs

    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))
    elif args.shield_json:
        import json

        # https://shields.io/endpoint
        color = Color("#50ca22", hue=lerp(0, 105/255, matching_ratio / 100))
        print(json.dumps({
            "schemaVersion": 1,
            "label": f"progress ({args.version})",
            "message": f"{matching_ratio:.2f}%",
            "color": color.hex,
        }))
    elif args.pr_comment:
        if funcs_delta > 0:
            if funcs_delta == 1:
                s = ""
            else:
                s = "s"

            print(f"{'🚀' * funcs_delta} This PR matches {funcs_delta} function{s} (+{ ratio_delta:.2f}%) on `{args.version}`.")
    else:
        if matching_size + nonmatching_size != total_size:
            print("Warning: category/total size mismatch!\n")
        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 funcs_delta > 0:
            if funcs_delta == 1:
                s = ""
            else:
                s = "s"

            print(f"This local build matches {funcs_delta} function{s} (+{ ratio_delta:.2f}%) over latest `{args.version}`.")


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Reports progress for the project")
    parser.add_argument("version", default="current", nargs="?")
    parser.add_argument("--csv", action="store_true")
    parser.add_argument("--shield-json", action="store_true")
    parser.add_argument("--pr-comment", action="store_true")
    args = parser.parse_args()

    main(args)