#!/bin/bash

set -e

usage() {
    printf "%s [--no-test]\n" "$CMD_NAME"
    printf "\n"
    printf "  --no-test: by default, the script only prints what it\n"
    printf "    would do. You can also set NO_TEST=1 environment variable.\n"
    printf "\n"
}

get_bool() {
    local name="$1"
    local val="${!name}"

    case "$val" in
        1|y|yes|Yes|YES|true|True|TRUE|on|On|ON)
            echo -n 1
            return 0
            ;;
        0|n|no|No|NO|false|False|FALSE|off|Off|OFF)
            echo -n 0
            return 0
            ;;
        *)
            printf "%s" "$2"
            ;;
    esac
}

die() {
    echo "ERROR: $*"
    exit 1
}

_pprint() {
    local a
    local sp=''

    for a; do
        printf "$sp%q" "$a"
        sp=' '
    done
}

call() {
    local m=""

    [ "$SKIP" = 1 ] && m="SKIP: "

    if [ "$NO_TEST" != 1 ]; then
        printf "WOULD: %s%s\n" "$m" "$(_pprint "$@")"
        return 0
    fi
    printf "CALL: %s%s\n" "$m" "$(_pprint "$@")"
    [ "$SKIP" = 1 ] || "$@"
}

git_config_reset() {
    local key="$1"
    local val="$2"
    local c=(git config --replace-all "$key" "$val")

    test "$#" == 2 || die "invalid arguments to git_config_add(): $@"

    if [ "$(git config --get-all "$key")" = "$val" ]; then
        SKIP=1 call "${c[@]}"
        return 0
    fi
    call "${c[@]}"
}

git_config_add() {
    local key="$1"
    local val="$2"
    local c=(git config --add "$key" "$val")

    test "$#" == 2 || die "invalid arguments to git_config_add(): $@"

    if git config --get-all "$key" | grep -qFx "$val"; then
        SKIP=1 call "${c[@]}"
        return 0
    fi
    call "${c[@]}"
}

CMD_NAME="$0"
NO_TEST="$(get_bool NO_TEST 0)"

for a; do
    case "$a" in
        --no-test)
            NO_TEST=1
            ;;
        -h|--help)
            usage
            exit 0
            ;;
        *)
            usage
            die "Invalid argument \"$a\""
            ;;
    esac
done

case "$(git config --get-all remote.origin.url)" in
    "https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git"| \
    "git@gitlab.freedesktop.org:NetworkManager/NetworkManager.git"| \
    "ssh://git@gitlab.freedesktop.org/NetworkManager/NetworkManager")
        ;;
    *)
        die "unexpected git repository. Expected that remote.origin.url is set to \"https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git\""
        ;;
esac

git_config_add blame.ignoreRevsFile '.git-blame-ignore-revs'
git_config_reset blame.markIgnoredLines true
git_config_reset blame.markUnblamableLines true
git_config_add notes.displayref 'refs/notes/bugs'
git_config_add remote.origin.fetch 'refs/notes/bugs:refs/notes/bugs'
git_config_reset remote.origin.pushurl 'git@gitlab.freedesktop.org:NetworkManager/NetworkManager.git'
git_config_add 'alias.backport-merge' '! (git show main:contrib/scripts/git-backport-merge || git show origin/main:contrib/scripts/git-backport-merge) | bash -s -'

if [ "$NO_TEST" != 1 ]; then
    printf "Run with \"--no-test\" or see \"-h\"\n" >&2
    printf "\n" >&2
    printf "    \"%s\" --no-test\n" "$CMD_NAME" >&2
fi