#!/usr/bin/env bash

export DISPLAY=""
export WAYLAND_DISPLAY="${WAYLAND_DISPLAY:-wayland-0}"
export XDG_SESSION_TYPE=wayland
export LIBSEAT_BACKEND=seatd
export SEATD_SOCK=/run/seatd.sock
export QT_PLUGIN_PATH="${QT_PLUGIN_PATH:-/usr/plugins}"
export QT_QPA_PLATFORM_PLUGIN_PATH="${QT_QPA_PLATFORM_PLUGIN_PATH:-/usr/plugins/platforms}"
export QML2_IMPORT_PATH="${QML2_IMPORT_PATH:-/usr/qml}"
export QT_WAYLAND_SHELL_INTEGRATION="${QT_WAYLAND_SHELL_INTEGRATION:-xdg-shell}"
export XCURSOR_THEME="${XCURSOR_THEME:-Pop}"
export XKB_CONFIG_ROOT="${XKB_CONFIG_ROOT:-/usr/share/X11/xkb}"

if [ -z "${XDG_RUNTIME_DIR:-}" ]; then
    export XDG_RUNTIME_DIR="/tmp/run/redbear-greeter"
fi

mkdir -p "$XDG_RUNTIME_DIR"

if [ -z "${DBUS_SESSION_BUS_ADDRESS:-}" ] && command -v dbus-launch >/dev/null 2>&1; then
    eval "$(dbus-launch --sh-syntax)"
fi

if ! command -v kwin_wayland_wrapper >/dev/null 2>&1; then
    # Fall back to redbear-compositor (simpler Rust compositor)
    if command -v /usr/bin/redbear-compositor >/dev/null 2>&1 || command -v redbear-compositor >/dev/null 2>&1; then
        echo "redbear-greeter-compositor: kwin_wayland_wrapper not found, using redbear-compositor" >&2
        exec /usr/bin/redbear-compositor
    fi
    echo "redbear-greeter-compositor: kwin_wayland_wrapper not found, and redbear-compositor not found either" >&2
    exit 1
fi

# Auto-detect DRM device if KWIN_DRM_DEVICES not explicitly set.
# Wait up to 5 seconds for the DRM device to appear (pcid-spawner is async).
if [ -z "${KWIN_DRM_DEVICES:-}" ]; then
    for _ in $(seq 1 10); do
        if [ -e /scheme/drm/card0 ]; then
            export KWIN_DRM_DEVICES="/scheme/drm/card0"
            break
        fi
        sleep 0.5
    done
fi

if [ -n "${KWIN_DRM_DEVICES:-}" ]; then
    echo "redbear-greeter-compositor: using DRM compositor backend (KWIN_DRM_DEVICES=${KWIN_DRM_DEVICES})" >&2
    exec kwin_wayland_wrapper --drm
else
    echo "redbear-greeter-compositor: using virtual compositor backend (set KWIN_DRM_DEVICES to enable DRM)" >&2
    exec kwin_wayland_wrapper --virtual
fi