# Copyright 2023 The JAX Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Utilities for the building JAX related python packages."""

from __future__ import annotations

import os
import pathlib
import platform
import shutil
import sys
import subprocess
import glob
from collections.abc import Sequence


def is_windows() -> bool:
  return sys.platform.startswith("win32")


def copy_file(
    src_files: str | Sequence[str],
    dst_dir: pathlib.Path,
    dst_filename = None,
    runfiles = None,
) -> None:
  dst_dir.mkdir(parents=True, exist_ok=True)
  if isinstance(src_files, str):
    src_files = [src_files]
  for src_file in src_files:
    src_file_rloc = runfiles.Rlocation(src_file)
    if src_file_rloc is None:
      raise ValueError(f"Unable to find wheel source file {src_file}")
    src_filename = os.path.basename(src_file_rloc)
    dst_file = os.path.join(dst_dir, dst_filename or src_filename)
    if is_windows():
      shutil.copyfile(src_file_rloc, dst_file)
    else:
      shutil.copy(src_file_rloc, dst_file)


def platform_tag(cpu: str) -> str:
  platform_name, cpu_name = {
    ("Linux", "x86_64"): ("manylinux2014", "x86_64"),
    ("Linux", "aarch64"): ("manylinux2014", "aarch64"),
    ("Linux", "ppc64le"): ("manylinux2014", "ppc64le"),
    ("Darwin", "x86_64"): ("macosx_10_14", "x86_64"),
    ("Darwin", "arm64"): ("macosx_11_0", "arm64"),
    ("Windows", "AMD64"): ("win", "amd64"),
  }[(platform.system(), cpu)]
  return f"{platform_name}_{cpu_name}"


def build_wheel(
    sources_path: str, output_path: str, package_name: str, git_hash: str = ""
) -> None:
  """Builds a wheel in `output_path` using the source tree in `sources_path`."""
  env = dict(os.environ)
  if git_hash:
    env["JAX_GIT_HASH"] = git_hash
  subprocess.run([sys.executable, "-m", "build", "-n", "-w"],
                 check=True, cwd=sources_path, env=env)
  for wheel in glob.glob(os.path.join(sources_path, "dist", "*.whl")):
    output_file = os.path.join(output_path, os.path.basename(wheel))
    sys.stderr.write(f"Output wheel: {output_file}\n\n")
    sys.stderr.write(f"To install the newly-built {package_name} wheel " +
                     "on system Python, run:\n")
    sys.stderr.write(f"  pip install {output_file} --force-reinstall\n\n")

    py_version = ".".join(platform.python_version_tuple()[:-1])
    sys.stderr.write(f"To install the newly-built {package_name} wheel " +
                     "on hermetic Python, run:\n")
    sys.stderr.write(f'  echo -e "\\n{output_file}" >> build/requirements.in\n')
    sys.stderr.write("  bazel run //build:requirements.update" +
                     f" --repo_env=HERMETIC_PYTHON_VERSION={py_version}\n\n")
    shutil.copy(wheel, output_path)

def build_editable(
    sources_path: str, output_path: str, package_name: str
) -> None:
  sys.stderr.write(
    f"To install the editable {package_name} build, run:\n\n"
    f"  pip install -e {output_path}\n\n"
  )
  shutil.rmtree(output_path, ignore_errors=True)
  shutil.copytree(sources_path, output_path)


def update_setup_with_cuda_version(file_dir: pathlib.Path, cuda_version: str):
  src_file = file_dir / "setup.py"
  with open(src_file) as f:
    content = f.read()
  content = content.replace(
      "cuda_version = 0  # placeholder", f"cuda_version = {cuda_version}"
  )
  with open(src_file, "w") as f:
    f.write(content)