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from .Common import globalParameters

import yaml

import os

def isCustomKernelConfig(config):
    return "CustomKernelName" in config and config["CustomKernelName"]

def getCustomKernelFilepath(name, directory=globalParameters["CustomKernelDirectory"]):
    return os.path.join(directory, (name + ".s"))

def getAllCustomKernelNames(directory=globalParameters["CustomKernelDirectory"]):
    return [fname[:-2] for fname in os.listdir(directory) if fname.endswith(".s")]

def getCustomKernelContents(name, directory=globalParameters["CustomKernelDirectory"]):
    try:
        with open(getCustomKernelFilepath(name, directory)) as f:
            return f.read()
    except:
        raise RuntimeError("Failed to find custom kernel: {}".format(os.path.join(directory, name)))

def getCustomKernelConfigAndAssembly(name, directory=globalParameters["CustomKernelDirectory"]):
    contents  = getCustomKernelContents(name, directory)
    config = "\n"    #Yaml configuration properties
    assembly = ""
    inConfig = False
    for line in contents.splitlines():
        if   line == "---": inConfig = True                          #Beginning of yaml section
        elif line == "...": inConfig = False                         #End of yaml section
        elif      inConfig: config   += line + "\n"
        else              : assembly += line + "\n"; config += "\n"  #Second statement to keep line numbers consistent for yaml errors

    return (config, assembly)

def getCustomKernelConfig(name, directory=globalParameters["CustomKernelDirectory"]):
    rawConfig, _ = getCustomKernelConfigAndAssembly(name, directory)
    try:
        return yaml.safe_load(rawConfig)["custom.config"]
    except yaml.scanner.ScannerError as e:
        raise RuntimeError("Failed to read configuration for custom kernel: {0}\nDetails:\n{1}".format(name, e))
