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from . import CUSTOM_KERNEL_PATH
from Tensile.Common.ValidParameters import checkParametersAreValid, validParameters, newMIValidParameters

import yaml

import os

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

def getCustomKernelFilepath(name, directory=CUSTOM_KERNEL_PATH):
    return os.path.join(directory, (name + ".s"))

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

def getCustomKernelContents(name, directory=CUSTOM_KERNEL_PATH):
    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=CUSTOM_KERNEL_PATH):
    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 readCustomKernelConfig(name, directory=CUSTOM_KERNEL_PATH):
    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))

def getCustomKernelConfig(
    kernelName: str, internalSupportParams: dict, directory: str = CUSTOM_KERNEL_PATH
) -> dict:
    """
    Retrieves and validates the configuration for a custom kernel.

    Args:
        kernelName: The name of the custom kernel.
        internalSupportParams: A dictionary of internal support parameters to be merged with the kernel configuration.
        directory: The directory where custom kernel files are located. Defaults to CUSTOM_KERNEL_PATH.

    Returns:
        dict: The validated configuration dictionary for the custom kernel.

    Raises:
        RuntimeError: If the custom kernel configuration is missing required fields or if there is an error reading the configuration.
    """
    kernelConfig = readCustomKernelConfig(kernelName, directory)
    if "InternalSupportParams" not in kernelConfig:
        raise RuntimeError(f"Custom kernel {kernelName} config must have 'InternalSupportParams'")

    if "KernArgsVersion" not in kernelConfig["InternalSupportParams"]:
        raise RuntimeError(f"Custom kernel {kernelName} config must have 'KernArgsVersion'")

    kernelIsp = kernelConfig["InternalSupportParams"]
    for key in internalSupportParams:
        if key not in kernelIsp:
            kernelIsp[key] = internalSupportParams[key]

    validParameters.update(newMIValidParameters)

    skipKeys = {"ProblemType", "InternalSupportParams", "KernelLanguage", "CustomKernelName"}
    for k, v in kernelConfig.items():
        if k not in skipKeys:
            checkParametersAreValid((k, [v]), validParameters)

    kernelConfig["KernelLanguage"] = "Assembly"
    kernelConfig["CustomKernelName"] = kernelName

    return kernelConfig