#!/usr/bin/env python3
# Copyright 2022 The IREE Authors
#
# Licensed under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

import glob
import os
import argparse
import pathlib
from typing import List, Optional, Sequence


def _check_dir_path(path):
  path = pathlib.Path(path)
  if path.is_dir():
    return path
  else:
    raise argparse.ArgumentTypeError(path)


def _check_file_path(path):
  path = pathlib.Path(path)
  if path.is_file():
    return path
  else:
    raise argparse.ArgumentTypeError(f"'{path}' is not found")


def _check_exe_path(path):
  path = pathlib.Path(path)
  if os.access(path, os.X_OK):
    return path
  else:
    raise argparse.ArgumentTypeError(f"'{path}' is not an executable")


class Parser(argparse.ArgumentParser):
  """Argument parser that includes common arguments and does validation."""

  def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)

    artifacts_dir_group = self.add_mutually_exclusive_group(required=True)
    # TODO(#11076): Replace build-dir argument with e2e-test-artifacts-dir.
    artifacts_dir_group.add_argument(
        "build_dir",
        metavar="<build-dir>",
        type=_check_dir_path,
        default=None,
        nargs="?",
        help="Path to the build directory containing benchmark suites")
    artifacts_dir_group.add_argument(
        "--e2e_test_artifacts_dir",
        metavar="<e2e-test-artifacts-dir>",
        type=_check_dir_path,
        default=None,
        help=(
            "Path to the IREE e2e test artifacts directory. This will override "
            "<build-dir> and eventually replace it. For now must use with "
            "--execution_benchmark_config"))

    self.add_argument(
        "--normal_benchmark_tool_dir",
        "--normal-benchmark-tool-dir",
        type=_check_dir_path,
        default=None,
        help="Path to the normal (non-tracing) iree tool directory")
    self.add_argument("--traced_benchmark_tool_dir",
                      "--traced-benchmark-tool-dir",
                      type=_check_dir_path,
                      default=None,
                      help="Path to the tracing-enabled iree tool directory")
    self.add_argument("--trace_capture_tool",
                      "--trace-capture-tool",
                      type=_check_exe_path,
                      default=None,
                      help="Path to the tool for collecting captured traces")
    self.add_argument(
        "--driver-filter-regex",
        "--driver_filter_regex",
        type=str,
        default=None,
        help="Only run benchmarks matching the given driver regex")
    self.add_argument(
        "--model-name-regex",
        "--model_name_regex",
        type=str,
        default=None,
        help="Only run benchmarks matching the given model name regex")
    self.add_argument(
        "--mode-regex",
        "--mode_regex",
        type=str,
        default=None,
        help="Only run benchmarks matching the given benchmarking mode regex")
    self.add_argument("--output",
                      "-o",
                      default=None,
                      type=pathlib.Path,
                      help="Path to the output file")
    self.add_argument("--capture_tarball",
                      "--capture-tarball",
                      default=None,
                      type=pathlib.Path,
                      help="Path to the tarball for captures")
    self.add_argument("--no-clean",
                      action="store_true",
                      help="Do not clean up the temporary directory used for "
                      "benchmarking on the Android device")
    self.add_argument("--verbose",
                      action="store_true",
                      help="Print internal information during execution")
    self.add_argument(
        "--pin-cpu-freq",
        "--pin_cpu_freq",
        action="store_true",
        help="Pin CPU frequency for all cores to the maximum. Requires root")
    self.add_argument("--pin-gpu-freq",
                      "--pin_gpu_freq",
                      action="store_true",
                      help="Pin GPU frequency to the maximum. Requires root")
    self.add_argument(
        "--keep_going",
        "--keep-going",
        action="store_true",
        help="Continue running after a failed benchmark. The overall exit status"
        " will still indicate failure and all errors will be reported at the end."
    )
    self.add_argument(
        "--tmp_dir",
        "--tmp-dir",
        "--tmpdir",
        default=pathlib.Path("/tmp/iree-benchmarks"),
        type=_check_dir_path,
        help="Base directory in which to store temporary files. A subdirectory"
        " with a name matching the git commit hash will be created.")
    self.add_argument(
        "--continue_from_directory",
        "--continue-from-directory",
        default=None,
        type=_check_dir_path,
        help="Path to directory with previous benchmark temporary files. This"
        " should be for the specific commit (not the general tmp-dir). Previous"
        " benchmark and capture results from here will not be rerun and will be"
        " combined with the new runs.")
    self.add_argument(
        "--benchmark_min_time",
        "--benchmark-min-time",
        default=0,
        type=float,
        help="If specified, this will be passed as --benchmark_min_time to the"
        "iree-benchmark-module (minimum number of seconds to repeat running "
        "for). In that case, no --benchmark_repetitions flag will be passed."
        " If not specified, a --benchmark_repetitions will be passed "
        "instead.")
    self.add_argument("--execution_benchmark_config",
                      type=_check_file_path,
                      default=None,
                      help="JSON config for the execution benchmarks")
    self.add_argument("--target_device_name",
                      type=str,
                      default=None,
                      help="Target device in benchmark config to run")

  def parse_args(
      self, arg_strs: Optional[Sequence[str]] = None) -> argparse.Namespace:
    args = super().parse_args(arg_strs)

    # TODO(#11076): Remove these checks and make --execution_benchmark_config
    # and --target_device_name required args.
    use_new_benchmark_suite = (args.execution_benchmark_config is not None or
                               args.target_device_name is not None)
    if use_new_benchmark_suite:
      if (args.execution_benchmark_config is None or
          args.target_device_name is None):
        self.error(
            "--execution_benchmark_config and --target_device_name must be set together."
        )
    elif args.e2e_test_artifacts_dir is not None:
      self.error(
          "--e2e_test_artifacts_dir requires --execution_benchmark_config and --target_device_name."
      )

    return args


def expand_and_check_file_paths(paths: Sequence[str]) -> List[pathlib.Path]:
  """Expands the wildcards in the paths and check if they are files.
    Returns:
      List of expanded paths.
  """

  expanded_paths = []
  for path in paths:
    expanded_paths += [pathlib.Path(path) for path in glob.glob(path)]

  for path in expanded_paths:
    if not path.is_file():
      raise ValueError(f"{path} is not a file.")

  return expanded_paths