#!/usr/bin/env bash

set -u

LOG_DIR="${XDG_STATE_HOME:-${HOME}/.local/state}/sunshine"
LOG_FILE="${LOG_DIR}/gaming-mode.log"

mkdir -p "${LOG_DIR}"

log() {
    printf '[%s] [LEAVE] %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$*" >> "${LOG_FILE}"
}

import_xfce_environment() {
    local session_pid
    local entry

    session_pid="$(pgrep -u "$(id -u)" -x xfce4-session | head -n 1 || true)"

    if [[ -n "${session_pid}" && -r "/proc/${session_pid}/environ" ]]; then
        while IFS= read -r -d '' entry; do
            case "${entry}" in
                DISPLAY=*|XAUTHORITY=*|DBUS_SESSION_BUS_ADDRESS=*|XDG_RUNTIME_DIR=*)
                    export "${entry}"
                    ;;
            esac
        done < "/proc/${session_pid}/environ"
    fi
}

import_xfce_environment

export DISPLAY="${DISPLAY:-:20}"

STATE_DIR="${XDG_RUNTIME_DIR:-/tmp}/sunshine-gaming-mode"
STATE_FILE="${STATE_DIR}/xfce-state"

desktop_was_running=1
panel_was_running=1

if [[ -f "${STATE_FILE}" ]]; then
    source "${STATE_FILE}"
fi

log "Leaving gaming mode on DISPLAY=${DISPLAY}"

if [[ "${desktop_was_running}" == "1" ]] &&
   ! pgrep -u "$(id -u)" -x xfdesktop >/dev/null 2>&1; then

    log "Starting xfdesktop"

    nohup xfdesktop --disable-wm-check \
        >> "${LOG_FILE}" 2>&1 &
fi

if [[ "${panel_was_running}" == "1" ]] &&
   ! pgrep -u "$(id -u)" -x xfce4-panel >/dev/null 2>&1; then

    log "Starting xfce4-panel"

    nohup xfce4-panel \
        >> "${LOG_FILE}" 2>&1 &
fi

rm -f "${STATE_FILE}"

log "XFCE desktop restored"

exit 0