#!/bin/sh
set -e

BIN_SRC="./whisper"
BIN_DST="/usr/bin/whisper"
CONF_DIR="/etc/whisper"
CONF_DST="$CONF_DIR/.env"
CONF_SRC="./example.env"

die() {
    printf '%s\n' "$1" >&2
    exit 1
}

usage() {
    printf 'Usage: install.sh [-i|--install] [-u|--uninstall] [-h|--help]\n'
    printf '  -i, --install    Install whisper (default)\n'
    printf '  -u, --uninstall  Remove whisper\n'
    printf '  -h, --help       Show this help\n'
    exit 0
}

do_install() {
    printf 'This will:\n'
    printf '  - Copy whisper to %s\n' "$BIN_DST"
    printf '  - Create %s/ with config\n\n' "$CONF_DIR"

    printf 'Proceed? [Y/n] '
    read -r answer
    case "$answer" in
        [nN]) printf 'Aborted.\n'; exit 0 ;;
    esac

    [ -f "$BIN_SRC" ] || die "Cannot find $BIN_SRC in current directory"
    [ -f "$CONF_SRC" ] || die "Cannot find $CONF_SRC in current directory"

    cp "$BIN_SRC" "$BIN_DST"
    chown root:root "$BIN_DST"
    chmod 755 "$BIN_DST"

    mkdir -p "$CONF_DIR"

    if [ ! -f "$CONF_DST" ]; then
        cp "$CONF_SRC" "$CONF_DST"
    else
        printf 'Keeping existing %s\n' "$CONF_DST"
    fi

    chown root:root "$CONF_DST"
    chmod 644 "$CONF_DST"

    printf '\nInstalled. Edit %s and set your values.\n' "$CONF_DST"
}

do_uninstall() {
    printf 'This will remove:\n'
    printf '  - %s\n' "$BIN_DST"
    printf '  - %s/\n\n' "$CONF_DIR"

    printf 'Proceed? [y/N] '
    read -r answer
    case "$answer" in
        [yY]) ;;
        *)    printf 'Aborted.\n'; exit 0 ;;
    esac

    rm -f "$BIN_DST"
    rm -rf "$CONF_DIR"

    printf 'Done.\n'
}

# --- main ---
[ "$(id -u)" -eq 0 ] || die "Must be run as root"

ACTION="install"
while [ $# -gt 0 ]; do
    case "$1" in
        -i|--install)   ACTION="install";   shift ;;
        -u|--uninstall) ACTION="uninstall"; shift ;;
        -h|--help)      usage ;;
        *)              die "Unknown option: $1" ;;
    esac
done

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