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# Common helper routines for testing collateral

import inspect
import os
import shutil
import subprocess
from importlib.machinery import SourceFileLoader
from pathlib import Path
from unittest.mock import patch

import pandas as pd
import pytest

rocprof_compute = SourceFileLoader("rocprof-compute", "src/rocprof-compute").load_module()


def check_resource_allocation():
    """Check if CTEST resource allocation is enabled for parallel testing and set
    HIP_VISIBLE_DEVICES variable accordingly with assigned gpu index.
    """

    if "CTEST_RESOURCE_GROUP_COUNT" not in os.environ:
        return

    if "CTEST_RESOURCE_GROUP_0_GPUS" in os.environ:
        resource = os.environ["CTEST_RESOURCE_GROUP_0_GPUS"]
        # extract assigned gpu id from env var: example format -> 'id:0,slots:1'
        for item in resource.split(","):
            key, value = item.split(":")
            if key == "id":
                os.environ["HIP_VISIBLE_DEVICES"] = value
                return

    return


def get_output_dir(suffix="_output", clean_existing=True):
    """Provides a unique output directory based on the name of the calling test function with a suffix applied.

    Args:
        suffix (str, optional): suffix to append to output_dir. Defaults to "_output".
        clean_existing (bool, optional): Whether to remove existing directory if exists. Defaults to True.
    """

    output_dir = inspect.stack()[1].function + suffix
    if clean_existing:
        if Path(output_dir).exists():
            shutil.rmtree(output_dir)
    return output_dir


def setup_workload_dir(input_dir, suffix="_tmp", clean_existing=True):
    """Provides a unique input workoad directory with contents of input_dir
    based on the name of the calling test function.

    Setup is a NOOP when tests run serially.
    """

    if "PYTEST_XDIST_WORKER_COUNT" not in os.environ:
        return input_dir

    output_dir = inspect.stack()[1].function + suffix
    if clean_existing:
        if Path(output_dir).exists():
            shutil.rmtree(output_dir)

    shutil.copytree(input_dir, output_dir)
    return output_dir


def clean_output_dir(cleanup, output_dir):
    """Remove output directory generated from rocprofiler-compute execution

    Args:
        cleanup (boolean): flag to enable/disable directory cleanup
        output_dir (string): name of directory to remove
    """
    if cleanup:
        if Path(output_dir).exists():
            try:
                shutil.rmtree(output_dir)
            except OSError as e:
                print("WARNING: shutil.rmdir(output_dir): directory may not be empty...")
    return


def check_csv_files(output_dir, num_devices, num_kernels):
    """Check profiling output csv files for expected number of entries (based on kernel invocations)

    Args:
        output_dir (string): output directory containing csv files
        num_kernels (int): number of kernels expected to have been profiled

    Returns:
        dict: dictionary housing file contents as pandas dataframe
    """

    file_dict = {}
    files_in_workload = os.listdir(output_dir)
    for file in files_in_workload:
        if file.endswith(".csv"):
            file_dict[file] = pd.read_csv(output_dir + "/" + file)
            if "roofline" in file:
                assert len(file_dict[file].index) >= num_devices
            elif not "sysinfo" in file:
                assert len(file_dict[file].index) >= num_kernels
        elif file.endswith(".pdf"):
            file_dict[file] = "pdf"
    return file_dict


@pytest.fixture
def binary_handler_profile_rocprof_compute(request):
    def _handler(config, workload_dir, options=[], check_success=True, roof=False):
        if request.config.getoption("--call-binary"):
            baseline_opts = [
                "build/rocprof-compute.bin",
                "profile",
                "-n",
                "app_1",
                "-VVV",
            ]
            if not roof:
                baseline_opts.append("--no-roof")
            process = subprocess.run(
                baseline_opts
                + options
                + ["--path", workload_dir, "--"]
                + config["app_1"],
                text=True,
            )
            # verify run status
            if check_success:
                assert process.returncode == 0
            return process.returncode
        else:
            baseline_opts = ["rocprof-compute", "profile", "-n", "app_1", "-VVV"]
            if not roof:
                baseline_opts.append("--no-roof")
            with pytest.raises(SystemExit) as e:
                with patch(
                    "sys.argv",
                    baseline_opts
                    + options
                    + ["--path", workload_dir, "--"]
                    + config["app_1"],
                ):
                    rocprof_compute.main()
            # verify run status
            if check_success:
                assert e.value.code == 0
            return e.value.code

    return _handler


@pytest.fixture
def binary_handler_analyze_rocprof_compute(request):
    def _handler(arguments):
        if request.config.getoption("--call-binary"):
            process = subprocess.run(
                ["build/rocprof-compute.bin", *arguments],
                text=True,
            )
            return process.returncode
        else:
            with pytest.raises(SystemExit) as e:
                with patch(
                    "sys.argv",
                    ["rocprof-compute", *arguments],
                ):
                    rocprof_compute.main()
            return e.value.code

    return _handler