from __future__ import annotations

import contextlib
import os
from typing import Generator
from typing import Sequence

from pre_commit import lang_base
from pre_commit.envcontext import envcontext
from pre_commit.envcontext import PatchesT
from pre_commit.envcontext import Var
from pre_commit.prefix import Prefix
from pre_commit.util import cmd_output_b

BUILD_DIR = ".build"
BUILD_CONFIG = "release"

ENVIRONMENT_DIR = "swift_env"
get_default_version = lang_base.basic_get_default_version
health_check = lang_base.basic_health_check
run_hook = lang_base.basic_run_hook


def get_env_patch(venv: str) -> PatchesT:  # pragma: win32 no cover
    bin_path = os.path.join(venv, BUILD_DIR, BUILD_CONFIG)
    return (("PATH", (bin_path, os.pathsep, Var("PATH"))),)


@contextlib.contextmanager  # pragma: win32 no cover
def in_env(prefix: Prefix, version: str) -> Generator[None, None, None]:
    envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
    with envcontext(get_env_patch(envdir)):
        yield


def install_environment(
    prefix: Prefix,
    version: str,
    additional_dependencies: Sequence[str],
) -> None:  # pragma: win32 no cover
    lang_base.assert_version_default("swift", version)
    lang_base.assert_no_additional_deps("swift", additional_dependencies)
    envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)

    # Build the swift package
    os.mkdir(envdir)
    cmd_output_b(
        "swift",
        "build",
        "--package-path",
        prefix.prefix_dir,
        "-c",
        BUILD_CONFIG,
        "--build-path",
        os.path.join(envdir, BUILD_DIR),
    )
