# 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
# All benchmarks' relative path against root build directory.

from argparse import Namespace
from dataclasses import dataclass
from typing import Optional
import pathlib

BENCHMARK_SUITE_REL_PATH = "benchmark_suites"
BENCHMARK_RESULTS_REL_PATH = "benchmark-results"
CAPTURES_REL_PATH = "captures"
E2E_TEST_ARTIFACTS_REL_PATH = "e2e_test_artifacts"


@dataclass
class TraceCaptureConfig:
  """Represents the settings for capturing traces during benchamrking.

    traced_benchmark_tool_dir: the path to the tracing-enabled benchmark tool
      directory.
    trace_capture_tool: the path to the tool for collecting captured traces.
    capture_tarball: the path of capture tar archive.
    capture_tmp_dir: the temporary directory to store captured traces.
  """

  traced_benchmark_tool_dir: pathlib.Path
  trace_capture_tool: pathlib.Path
  capture_tarball: pathlib.Path
  capture_tmp_dir: pathlib.Path


@dataclass
class BenchmarkConfig:
  """Represents the settings to run benchmarks.

    root_benchmark_dir: the root directory containing the built benchmark
      suites.
    benchmark_results_dir: the directory to store benchmark results files.
    git_commit_hash: the git commit hash.
    normal_benchmark_tool_dir: the path to the non-traced benchmark tool
      directory.
    trace_capture_config: the config for capturing traces. Set if and only if
      the traces need to be captured.
    driver_filter: filter benchmarks to those whose driver matches this regex
      (or all if this is None).
    model_name_filter: filter benchmarks to those whose model name matches this
      regex (or all if this is None).
    mode_filter: filter benchmarks to those whose benchmarking mode matches this
      regex (or all if this is None).
    keep_going: whether to proceed if an individual run fails. Exceptions will
      logged and returned.
    benchmark_min_time: min number of seconds to run the benchmark for, if
      specified. Otherwise, the benchmark will be repeated a fixed number of
      times.
    continue_from_previous: skip the benchmarks if their results are found in
      the benchmark_results_dir.
  """

  root_benchmark_dir: pathlib.Path
  benchmark_results_dir: pathlib.Path
  git_commit_hash: str

  normal_benchmark_tool_dir: Optional[pathlib.Path] = None
  trace_capture_config: Optional[TraceCaptureConfig] = None

  driver_filter: Optional[str] = None
  model_name_filter: Optional[str] = None
  mode_filter: Optional[str] = None

  keep_going: bool = False
  benchmark_min_time: float = 0
  continue_from_previous: bool = False

  @staticmethod
  def build_from_args(args: Namespace, git_commit_hash: str):
    """Build config from command arguments.

    Args:
      args: the command arguments.
      git_commit_hash: the git commit hash of IREE.
    """

    def real_path_or_none(
        path: Optional[pathlib.Path]) -> Optional[pathlib.Path]:
      return path.resolve() if path else None

    if not args.normal_benchmark_tool_dir and not args.traced_benchmark_tool_dir:
      raise ValueError(
          "At least one of --normal_benchmark_tool_dir or --traced_benchmark_tool_dir should be specified."
      )
    if not ((args.traced_benchmark_tool_dir is None) ==
            (args.trace_capture_tool is None) ==
            (args.capture_tarball is None)):
      raise ValueError(
          "The following 3 flags should be simultaneously all specified or all unspecified: --traced_benchmark_tool_dir, --trace_capture_tool, --capture_tarball"
      )

    per_commit_tmp_dir: pathlib.Path = (args.tmp_dir /
                                        git_commit_hash).resolve()

    if args.traced_benchmark_tool_dir is None:
      trace_capture_config = None
    else:
      trace_capture_config = TraceCaptureConfig(
          traced_benchmark_tool_dir=args.traced_benchmark_tool_dir.resolve(),
          trace_capture_tool=args.trace_capture_tool.resolve(),
          capture_tarball=args.capture_tarball.resolve(),
          capture_tmp_dir=per_commit_tmp_dir / CAPTURES_REL_PATH)

    if args.e2e_test_artifacts_dir is not None:
      root_benchmark_dir = args.e2e_test_artifacts_dir
    else:
      # TODO(#11076): Remove legacy path.
      build_dir = args.build_dir.resolve()
      if args.execution_benchmark_config is not None:
        root_benchmark_dir = build_dir / E2E_TEST_ARTIFACTS_REL_PATH
      else:
        root_benchmark_dir = build_dir / BENCHMARK_SUITE_REL_PATH

    return BenchmarkConfig(root_benchmark_dir=root_benchmark_dir,
                           benchmark_results_dir=per_commit_tmp_dir /
                           BENCHMARK_RESULTS_REL_PATH,
                           git_commit_hash=git_commit_hash,
                           normal_benchmark_tool_dir=real_path_or_none(
                               args.normal_benchmark_tool_dir),
                           trace_capture_config=trace_capture_config,
                           driver_filter=args.driver_filter_regex,
                           model_name_filter=args.model_name_regex,
                           mode_filter=args.mode_regex,
                           keep_going=args.keep_going,
                           benchmark_min_time=args.benchmark_min_time,
                           continue_from_previous=args.continue_from_previous)