#!/usr/bin/env python3
from pathlib import Path
import os
import shutil
from time import time


__version__ = "0.0.5"
__author__ = "rigodron, algoflash, GGLinnk"
__license__ = "MIT"
__status__ = "developpement"


##################################################
# Set roms_path with your ROMs (at the root of the ROM folder)
# Extract all files from file system using dolphin emu - put it in f"{dolphin_unpack_path}/root/"
# Extract boot.dol and apploader.img using dolphin emu - put it in f"{dolphin_unpack_path}/sys/"
##################################################
roms_path           = Path("../ROM")
dolphin_unpack_path = Path("dolphin_unpack")

# Created tmp paths
unpack_path         = Path("unpack")
unpack2_path        = Path("unpack2")
repack_path         = Path("repack")
# if there is a way to create symlinks on GCM filesystem, it could create strange situations


def print_paths_differences(folder1_paths:list, folder2_paths:list):
    backup_paths = folder2_paths.copy()
    for path in folder1_paths:
        if path in folder2_paths:
            folder2_paths.remove(path)
    for path in backup_paths:
        if path in folder1_paths:
            folder1_paths.remove(path)
    print("folder1 diff :")
    for path in folder1_paths:
        print(path)
    print("folder2 diff :")
    for path in folder2_paths:
        print(path)


# compare two files
def compare_files(file1_path:Path, file2_path:Path):
    CLUSTER_LEN = 131072
    with file1_path.open("rb") as file1, file2_path.open("rb") as file2:
        # Init
        bytes1 = file1.read(CLUSTER_LEN)
        bytes2 = file2.read(CLUSTER_LEN)
        while bytes1 or bytes2: # continue if bytes1 and bytes2 have a len > 0
            if bytes1 != bytes2:
                return False
            bytes1 = file1.read(CLUSTER_LEN)
            bytes2 = file2.read(CLUSTER_LEN)
    return True


# compare two GCM
#     -> raise an exception if there is a difference
def compare_GCM(folder1: Path, folder2: Path):
    folder1_root_paths = list((folder1 / "root").glob("**/*"))
    folder1_file_count = len(folder1_root_paths)
    print(f"compare \"{folder1}\" - \"{folder2}\" ({folder1_file_count} files)")
    if folder1_file_count == 0:
        raise Exception(f"ERROR - EMPTY FOLDER: {folder1}")

    len1 = len(folder1.parts)
    len2 = len(folder2.parts)
    # 1. Compare names of filesystems
    folder1_paths = [Path(*path.parts[len1:]) for path in folder1_root_paths]
    folder2_paths = [Path(*path.parts[len2:]) for path in (folder2 / "root").glob('**/*')]
    if folder1_paths != folder2_paths:
        print_paths_differences(folder1_paths, folder2_paths)
        raise Exception(f"Folders \"{folder1}\" and \"{folder2}\" are different (not the same folders or files names).")
    # 2. Compare sys files content
    if not compare_files(folder1/"sys"/"apploader.img", folder2/"sys"/"apploader.img"):
        raise Exception(f"\"{folder1}/sys/apploader.bin\" and \"{folder2}/sys/apploader.bin\" are different.")
    if not compare_files(folder1/"sys"/"boot.dol", folder2/"sys"/"boot.dol"):
        raise Exception(f"\"{folder1}/sys/boot.bin\" and \"{folder2}/sys/boot.bin\" are different.")

    for path1 in folder1_root_paths:
        if path1.is_file():
            path2 = folder2/Path(*path1.parts[len1:])
            if not compare_files(path1, path2):
                raise Exception(f"\"{path1}/\" and \"{path2}\" are different.")


##################################################
# gcmtool.py commands wrappers
##################################################
def gcmtool_unpack(iso_path:Path, folder_path:Path):
    if os.system(f"python gcmtool.py -u \"{iso_path}\" \"{folder_path}\"") != 0:
        raise Exception("Error while unpacking gcm.")
def gcmtool_pack(folder_path:Path, iso_path:Path):
    if os.system(f"python gcmtool.py -p \"{folder_path}\" \"{iso_path}\"") != 0:
        raise Exception("Error while packing gcm.")
def gcmtool_rebuild_fst(folder_path:Path):
    if os.system(f"python gcmtool.py -r \"{folder_path}\"") != 0:
        raise Exception("Error while rebuilding FST.")


start = time()
print("###############################################################################")
print("# Checking tests folder")
print("###############################################################################")
# Check if tests folders exist
if unpack_path.is_dir() or unpack2_path.is_dir() or repack_path.is_dir():
    raise Exception(f"Error - Please remove:\n-{unpack_path}\n-{unpack2_path}\n-{repack_path}")

print("###############################################################################")
print("# TEST 1/3")
print("# Comparing roms_path->unpack->[unpack_path] ROMs with [dolphin_unpack_path]")
print("###############################################################################")
# unpack ROM in unpack_path
unpack_path.mkdir(parents=True)
for iso_path in roms_path.glob("*"):
    if iso_path.is_file():
        gcmtool_unpack(iso_path, unpack_path / iso_path.name)

# compare unpack_path dolphin_unpack_path
for folder_path in unpack_path.glob("*"):
    compare_GCM(folder_path, dolphin_unpack_path / folder_path.name)

print("###############################################################################")
print("# TEST 2/3")
print("# Comparing [unpack_path]->pack->unpack->[unpack2_path]")
print("###############################################################################")
# repack unpack_path repack_path
repack_path.mkdir()
unpack_paths = list(unpack_path.glob("*"))
for folder_path in unpack_paths:
    gcmtool_pack(folder_path, repack_path / folder_path.name)

# unpack repack_path unpack2_path
unpack2_path.mkdir()
for iso_path in repack_path.glob("*"):
    gcmtool_unpack(iso_path, unpack2_path / iso_path.name)

# remove repack_path
shutil.rmtree(repack_path)

# compare unpack_path unpack2_path
for folder_path in unpack_paths:
    compare_GCM(folder_path, unpack2_path / folder_path.name)

# remove unpack2_path
shutil.rmtree(unpack2_path)

print("###############################################################################")
print("# TEST 3/3")
print("# Comparing [unpack_path]->rebuild_fst->repack->unpack->[unpack2_path]")
print("###############################################################################")
# rebuild unpack_path FSTs
unpack_paths = list(unpack_path.glob("*"))
for folder_path in unpack_paths:
    gcmtool_rebuild_fst(folder_path)

# repack unpack_path repack_path
repack_path.mkdir()
for folder_path in unpack_paths:
    gcmtool_pack(folder_path, repack_path / folder_path.name)

# unpack repack_path unpack2_path
unpack2_path.mkdir()
for iso_path in repack_path.glob("*"):
    gcmtool_unpack(iso_path, unpack2_path / iso_path.name)

# remove repack_path
shutil.rmtree(repack_path)

# compare unpack_path unpack2_path
for folder_path in unpack_path.glob("*"):
    compare_GCM(folder_path, unpack2_path / folder_path.name)

# Remove tests folders
print("###############################################################################")
print(f"# Cleaning test folders.")
print("###############################################################################")
shutil.rmtree(unpack_path)
shutil.rmtree(unpack2_path)

end = time()
print("###############################################################################")
print(f"# All tests are OK - elapsed time : {end - start}")
print("###############################################################################")