import yaml

# Assumes this is ran from the root of the repository
file_path = "./bin/resources/GameIndex.yaml"

# These settings have to be manually kept in sync with the emulator code unfortunately.
# up to date validation should ALWAYS be provided via the application!
allowed_game_options = [
    "name",
    "region",
    "compat",
    "roundModes",
    "clampModes",
    "gameFixes",
    "speedHacks",
    "memcardFilters",
    "patches",
]
allowed_round_modes = ["eeRoundMode", "vuRoundMode"]
allowed_clamp_modes = ["eeClampMode", "vuClampMode"]
allowed_game_fixes = [
    "VuAddSubHack",
    "FpuCompareHack",
    "FpuMulHack",
    "FpuNegDivHack",
    "XGKickHack",
    "EETimingHack",
    "SkipMPEGHack",
    "OPHFlagHack",
    "DMABusyHack",
    "VIFFIFOHack",
    "VIF1StallHack",
    "GIFFIFOHack",
    "GoemonTlbHack",
    "VUSyncHack",
    "IbitHack",
    "VUOverflowHack",
]
allowed_speed_hacks = ["mvuFlagSpeedHack", "InstantVU1SpeedHack"]
# Patches are allowed to have a 'default' key or a crc-32 key, followed by
allowed_patch_options = ["author", "content"]

issue_list = []


def is_hex_number(string):
    try:
        int(string, 16)
        return True
    except Exception:
        return False


def validate_string_option(serial, key, value):
    if not isinstance(value, str):
        issue_list.append("[{}]: '{}' must be a string".format(serial, key))


def validate_int_option(serial, key, value, low, high):
    if not isinstance(value, int) or (value < low or value > high):
        issue_list.append(
            "[{}]: '{}' must be an int and between {}-{} (inclusive)".format(
                serial, key, low, high
            )
        )


def validate_list_of_strings(serial, key, value):
    if not isinstance(value, list) or not all(isinstance(item, str) for item in value):
        issue_list.append("[{}]: '{}' must be a list of strings".format(serial, key))


def validate_valid_options(serial, key, value, allowed_values):
    if value not in allowed_values:
        issue_list.append("[{}]: Invalid '{}' option [{}]".format(serial, key, value))


def validate_clamp_round_modes(serial, key, value, allowed_values):
    if not isinstance(value, dict):
        issue_list.append("[{}]: '{}' must be a valid object".format(serial, key))
        return
    for mode_key, mode_value in value.items():
        validate_valid_options(serial, key, mode_key, allowed_values)
        validate_int_option(serial, key, mode_value, 0, 3)


def validate_game_fixes(serial, key, value):
    if not isinstance(value, list):
        issue_list.append(
            "[{}]: 'gameFixes' must be a list of valid gameFixes".format(serial)
        )
        return
    for gamefix in value:
        validate_valid_options(serial, key, gamefix, allowed_game_fixes)


def validate_speed_hacks(serial, key, value):
    if not isinstance(value, dict):
        issue_list.append("[{}]: 'speedHacks' must be a valid object".format(serial))
        return
    for speedhack, speedhack_value in value.items():
        validate_valid_options(serial, key, speedhack, allowed_speed_hacks)
        validate_int_option(serial, speedhack, speedhack_value, 0, 1)


def validate_patches(serial, key, value):
    if not isinstance(value, dict):
        issue_list.append(
            "[{}]: 'patches' must be valid mapping of CRC32 -> Patch Objects".format(
                serial
            )
        )
        return
    for crc, patch in value.items():
        if crc != "default" and not is_hex_number(str(crc)):
            issue_list.append(
                "[{}]: Patches must either be key'd with 'default' or a valid CRC-32 Hex String".format(
                    serial
                )
            )
            continue
        for patch_option, option_value in patch.items():
            validate_valid_options(serial, key, patch_option, allowed_patch_options)
            if patch_option == "author":
                validate_string_option(serial, patch_option, option_value)
            if patch_option == "content":
                validate_string_option(serial, patch_option, option_value)


# pylint:disable=unnecessary-lambda
option_validation_handlers = {
    "name": (lambda serial, key, value: validate_string_option(serial, key, value)),
    "region": (lambda serial, key, value: validate_string_option(serial, key, value)),
    "compat": (
        lambda serial, key, value: validate_int_option(serial, key, value, 0, 6)
    ),
    "roundModes": (
        lambda serial, key, value: validate_clamp_round_modes(
            serial, key, value, allowed_round_modes
        )
    ),
    "clampModes": (
        lambda serial, key, value: validate_clamp_round_modes(
            serial, key, value, allowed_clamp_modes
        )
    ),
    "gameFixes": (lambda serial, key, value: validate_game_fixes(serial, key, value)),
    "speedHacks": (lambda serial, key, value: validate_speed_hacks(serial, key, value)),
    "memcardFilters": (
        lambda serial, key, value: validate_list_of_strings(serial, key, value)
    ),
    "patches": (lambda serial, key, value: validate_patches(serial, key, value)),
}

print("Opening {}...".format(file_path))
with open(file_path) as f:
    try:
        print("Attempting to parse GameDB file...")
        gamedb = yaml.load(f, Loader=yaml.FullLoader)
    except Exception as err:
        print(err)
        print(
            "Unable to parse GameDB. Exiting, verify that the file indeed is valid YAML."
        )
        exit(1)

    print("File loaded successfully, validating schema...")
    progress_counter = 0
    for serial, game_options in gamedb.items():
        progress_counter = progress_counter + 1
        if progress_counter % 500 == 0 or progress_counter >= len(gamedb.items()):
            print(
                "[{}/{}] Processing GameDB Entries...".format(
                    progress_counter, len(gamedb.items())
                )
            )

        # Check for required values
        if not "name" in game_options.keys():
            issue_list.append("[{}]: 'name' is a required value".format(serial))
        if not "region" in game_options.keys():
            issue_list.append("[{}]: 'region' is a required value".format(serial))

        # Check the options
        for key, value in game_options.items():
            if key not in allowed_game_options:
                issue_list.append("[{}]: Invalid option [{}]".format(serial, key))
                continue

            if key in option_validation_handlers:
                option_validation_handlers[key](serial, key, value)

if len(issue_list) > 0:
    print("Issues found during validation:")
    print(*issue_list, sep="\n")
    exit(1)
else:
    print("GameDB Validated Successfully!")
    exit(0)