# SPDX-FileCopyrightText: 2026 Dilluti0n <hskimse1@gmail.com>
# SPDX-License-Identifier: GPL-3.0-or-later

# DPIBreak install script
# CHANGELOG:
# v1.4 - Support for new tarball/exdir naming (since DPIBreak v0.6.2)
# v1.3 - Fix to prevent tarball fetch and install logs from appearing during uninstallation
# v1.2 - Remove -v on tar, fix/add logs and add SVERSION variable
# v1.1 - Remove make dependency

set -eu

SVERSION='v1.4'
PROJECT='DPIBreak'
REPO='dilluti0n/dpibreak'
LINUX='Linux'
AMD64='x86_64'

die() {
    [ $# -eq 0 ] || echo Error: "$@" >&2
    exit 1
}

get_tag() {
    api_version='2022-11-28'
    api_uri="https://api.github.com/repos/$REPO/releases/latest"

    tag=$(curl -fsSL -H "X-GitHub-Api-Version: $api_version" "$api_uri" \
              | grep '"tag_name":' | cut -d '"' -f 4)
    [ -n "$tag" ] || die Failed to fetch latest release tag from $api_uri

    echo Latest release: $tag >&2

    echo "$tag"
}

available_cmd() {
    [ $# -eq 0 ] && return

    cmd=

    for cmd in "$@"; do
        if command -v "$cmd" >/dev/null 2>&1; then
            echo "$cmd"
            return 0
        fi
    done

    return 1
}

do_sudo() {
    if [ "$(id -u)" -eq 0 ]; then
        "$@"
        return $?
    fi

    SUDO=$(available_cmd sudo doas)

    [ -n "$SUDO" ] || die No privilege escalation command found '(sudo/doas)'. Re-run as root.

    echo Privilege escalation required: "$@" >&2
    $SUDO "$@"
}

get_opt() {
    if [ $# -eq 0 ]; then
        echo install
    elif [ "$1" = "uninstall" ]; then
        echo uninstall
    else
        die "Unknown argument: $1"
    fi
}

PREFIX=/usr/local
MANPREFIX="$PREFIX/share/man"
PROG='dpibreak'
MAN='dpibreak.1'

echo "$PROJECT installer $SVERSION for $AMD64 $LINUX"
echo Source: "https://github.com/$REPO/blob/master/install.sh"
MODE=$(get_opt "$@")

do_install() {
    echo This will install $PROG to $PREFIX and $MAN to $MANPREFIX. >&2
    KERNEL=$(uname -s)
    ARCH=$(uname -m)

    [ "$KERNEL" = "$LINUX" ] || die "$KERNEL: not supported. Only $LINUX is supported."
    [ "$ARCH" = "$AMD64" ] || die "$ARCH: not supported. Only $AMD64 is supported."

    TAG=$(get_tag)
    TARBALL="$PROG-${TAG#v}-$ARCH-unknown-linux-musl.tar.gz"
    EXDIR="$PROG-${TAG#v}"
    URI="https://github.com/$REPO/releases/download/$TAG/$TARBALL"
    WORKDIR=$(mktemp -d)
    trap 'rm -rf "$WORKDIR"' EXIT

    cd "$WORKDIR" || die Failed to create temporary directory
    curl -fsSL --retry 3 --connect-timeout 5 -o "$TARBALL" "$URI" \
        || die Failed to download $URI
    tar -xzf "$TARBALL"

    if ! cd "$EXDIR"; then
        echo Tarball might be older than v0.6.2. Falling back to legacy path... >&2
        EXDIR_LEGACY="$PROJECT-${TAG#v}-$ARCH-unknown-linux-musl"
        cd "$EXDIR_LEGACY" || die Failed to enter directory: both $EXDIR \
                                  and legacy $EXDIR_LEGACY
    fi

    do_sudo install -Dm755 "$PROG" "$PREFIX/bin/$PROG"
    do_sudo install -Dm644 "$MAN"  "$MANPREFIX/man1/$MAN"
    echo "Installation complete." >&2
}

do_uninstall() {
    do_sudo rm -f "$PREFIX/bin/$PROG"
    do_sudo rm -f "$MANPREFIX/man1/$MAN"
    echo "Uninstallation complete." >&2
}

case "$MODE" in
    install)   do_install   ;;
    uninstall) do_uninstall ;;
esac