# Copyright 2023 Oliver Smith
# SPDX-License-Identifier: GPL-3.0-or-later
import os
from pathlib import Path
import subprocess
from pmb.core.arch import Arch
import pmb.helpers.run_core
from collections.abc import Sequence
from typing import overload, Literal
from pmb.types import (
    Env,
    PathString,
    RunOutputType,
    RunOutputTypeDefault,
    RunOutputTypePopen,
    RunReturnType,
)


def user(
    cmd: Sequence[PathString],
    working_dir: Path | None = None,
    output: RunOutputType = "log",
    output_return: bool = False,
    check: bool | None = None,
    env: Env = {},
    sudo: bool = False,
) -> RunReturnType:
    """
    Run a command on the host system as user.

    :param env: dict of environment variables to be passed to the command, e.g.
                {"JOBS": "5"}

    See pmb.helpers.run_core.core() for a detailed description of all other
    arguments and the return value.
    """
    cmd_parts = []
    for c in cmd:
        if isinstance(c, Arch):
            c = str(c)
        else:
            c = os.fspath(c)
        cmd_parts.append(c)
    # Readable log message (without all the escaping)
    msg = "% "
    for key, value in env.items():
        msg += f"{key}={value} "
    if working_dir is not None:
        msg += f"cd {os.fspath(working_dir)}; "
    msg += " ".join(cmd_parts)

    # Add environment variables and run
    env = env.copy()
    pmb.helpers.run_core.add_proxy_env_vars(env)
    if env:
        cmd_parts = ["sh", "-c", pmb.helpers.run_core.flat_cmd([cmd_parts], env=env)]
    return pmb.helpers.run_core.core(
        msg, cmd_parts, working_dir, output, output_return, check, sudo
    )


# FIXME: should probably use some kind of wrapper class / builder pattern for all these parameters...
def user_output(
    cmd: Sequence[PathString],
    working_dir: Path | None = None,
    output: RunOutputType = "log",
    check: bool | None = None,
    env: Env = {},
    sudo: bool = False,
) -> str:
    ret = user(cmd, working_dir, output, output_return=True, check=check, env=env, sudo=sudo)
    if not isinstance(ret, str):
        raise TypeError("Expected str output, got " + str(ret))

    return ret


@overload
def root(
    cmd: Sequence[PathString],
    working_dir: Path | None = ...,
    output: RunOutputTypePopen = ...,
    output_return: Literal[False] = ...,
    check: bool | None = ...,
    env: Env = ...,
) -> subprocess.Popen: ...


@overload
def root(
    cmd: Sequence[PathString],
    working_dir: Path | None = ...,
    output: RunOutputTypeDefault = ...,
    output_return: Literal[False] = ...,
    check: bool | None = ...,
    env: Env = ...,
) -> int: ...


@overload
def root(
    cmd: Sequence[PathString],
    working_dir: Path | None = ...,
    output: RunOutputType = ...,
    output_return: Literal[True] = ...,
    check: bool | None = ...,
    env: Env = ...,
) -> str: ...


def root(
    cmd: Sequence[PathString],
    working_dir: Path | None = None,
    output: RunOutputType = "log",
    output_return: bool = False,
    check: bool | None = None,
    env: Env = {},
) -> RunReturnType:
    """Run a command on the host system as root, with sudo or doas.

    :param env: dict of environment variables to be passed to the command, e.g.
                {"JOBS": "5"}

    See pmb.helpers.run_core.core() for a detailed description of all other
    arguments and the return value.
    """
    env = env.copy()
    pmb.helpers.run_core.add_proxy_env_vars(env)

    if env:
        cmd = ["sh", "-c", pmb.helpers.run_core.flat_cmd([cmd], env=env)]
    cmd = pmb.config.sudo(cmd)

    return user(cmd, working_dir, output, output_return, check, env, True)