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# Copyright (c) 2011 Advanced Micro Devices, Inc.
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from asyncio import subprocess
import os
import sys
import subprocess

import gem5_scons.util
import SCons.Script

git_style_message = """
You're missing the pre-commit/commit-msg hooks. These hook help to ensure your
code follows gem5's style rules on git commit and your commit messages follow
our commit message requirements. This script will now install these hooks in
your .git/hooks/ directory.
Press enter to continue, or ctrl-c to abort:
"""


def install_style_hooks(env):
    try:
        gitdir = env.Dir(
            gem5_scons.util.readCommand(
                ["git", "rev-parse", "--git-dir"]
            ).strip("\n")
        )
    except Exception as e:
        print("Warning: Failed to find git repo directory: %s" % e)
        return

    git_hooks = gitdir.Dir("hooks")

    def hook_exists(hook_name):
        hook = git_hooks.File(hook_name)
        return hook.exists()

    if hook_exists("pre-commit") and hook_exists("commit-msg"):
        return

    print(git_style_message, end=" ")
    if SCons.Script.GetOption("install_hooks"):
        print("Installing revision control hooks automatically.")
    else:
        try:
            input()
        except:
            print("Input exception, exiting scons.\n")
            sys.exit(1)

    pre_commit_install = env.Dir("#util").File("pre-commit-install.sh")

    ret = subprocess.call(str(pre_commit_install), shell=True)
    if ret != 0:
        print(
            "It is strongly recommended you install the pre-commit hooks "
            "before working with gem5. Do you want to continue compilation "
            "(y/n)?"
        )
        while True:
            response = input().lower().strip()
            if response in {"yes", "ye", "y"}:
                return
            elif response in {"no", "n"}:
                sys.exit(1)
            else:
                print(
                    f"Could not parse answer '{response}'. Do you want to "
                    "continue compilation (y/n)?"
                )


def generate(env):
    if exists(env) and not gem5_scons.util.ignore_style():
        install_style_hooks(env)


def exists(env):
    return env.Entry("#.git").exists()