"""Legacy installation process, i.e. `setup.py install`.
"""

import logging
import os
from distutils.util import change_root
from typing import List, Optional, Sequence

from pip._internal.build_env import BuildEnvironment
from pip._internal.exceptions import InstallationError
from pip._internal.models.scheme import Scheme
from pip._internal.utils.logging import indent_log
from pip._internal.utils.misc import ensure_dir
from pip._internal.utils.setuptools_build import make_setuptools_install_args
from pip._internal.utils.subprocess import runner_with_spinner_message
from pip._internal.utils.temp_dir import TempDirectory

logger = logging.getLogger(__name__)


class LegacyInstallFailure(Exception):
    pass


def write_installed_files_from_setuptools_record(
    record_lines: List[str],
    root: Optional[str],
    req_description: str,
) -> None:
    def prepend_root(path: str) -> str:
        if root is None or not os.path.isabs(path):
            return path
        else:
            return change_root(root, path)

    for line in record_lines:
        directory = os.path.dirname(line)
        if directory.endswith(".egg-info"):
            egg_info_dir = prepend_root(directory)
            break
    else:
        message = (
            "{} did not indicate that it installed an "
            ".egg-info directory. Only setup.py projects "
            "generating .egg-info directories are supported."
        ).format(req_description)
        raise InstallationError(message)

    new_lines = []
    for line in record_lines:
        filename = line.strip()
        if os.path.isdir(filename):
            filename += os.path.sep
        new_lines.append(os.path.relpath(prepend_root(filename), egg_info_dir))
    new_lines.sort()
    ensure_dir(egg_info_dir)
    inst_files_path = os.path.join(egg_info_dir, "installed-files.txt")
    with open(inst_files_path, "w") as f:
        f.write("\n".join(new_lines) + "\n")


def install(
    install_options: List[str],
    global_options: Sequence[str],
    root: Optional[str],
    home: Optional[str],
    prefix: Optional[str],
    use_user_site: bool,
    pycompile: bool,
    scheme: Scheme,
    setup_py_path: str,
    isolated: bool,
    req_name: str,
    build_env: BuildEnvironment,
    unpacked_source_directory: str,
    req_description: str,
) -> bool:

    header_dir = scheme.headers

    with TempDirectory(kind="record") as temp_dir:
        try:
            record_filename = os.path.join(temp_dir.path, "install-record.txt")
            install_args = make_setuptools_install_args(
                setup_py_path,
                global_options=global_options,
                install_options=install_options,
                record_filename=record_filename,
                root=root,
                prefix=prefix,
                header_dir=header_dir,
                home=home,
                use_user_site=use_user_site,
                no_user_config=isolated,
                pycompile=pycompile,
            )

            runner = runner_with_spinner_message(
                f"Running setup.py install for {req_name}"
            )
            with indent_log(), build_env:
                runner(
                    cmd=install_args,
                    cwd=unpacked_source_directory,
                )

            if not os.path.exists(record_filename):
                logger.debug("Record file %s not found", record_filename)
                # Signal to the caller that we didn't install the new package
                return False

        except Exception as e:
            # Signal to the caller that we didn't install the new package
            raise LegacyInstallFailure from e

        # At this point, we have successfully installed the requirement.

        # We intentionally do not use any encoding to read the file because
        # setuptools writes the file using distutils.file_util.write_file,
        # which does not specify an encoding.
        with open(record_filename) as f:
            record_lines = f.read().splitlines()

    write_installed_files_from_setuptools_record(record_lines, root, req_description)
    return True