#!/bin/sh
# VMware / development-only launcher for nebula-shell.
#
# The Ubuntu VMware guest GPU cannot currently run the Qt Quick accelerated
# scene graph correctly. This wrapper sets QT_QUICK_BACKEND=software.
#
# Production sessions must start `nebula-shell` directly and must NOT export
# QT_QUICK_BACKEND. GPU-accelerated Qt Quick is the production default.
#
# Usage (from a running Nebula Sway session, or via nebula-sway.conf exec):
#   scripts/run-nebula-vm.sh
#
# Disable autostart:
#   NEBULA_SHELL_AUTOSTART=0 sway -c compositor/sway/nebula-sway.conf

set -eu

if [ "${NEBULA_SHELL_AUTOSTART:-1}" = "0" ]; then
    echo "nebula: shell autostart disabled (NEBULA_SHELL_AUTOSTART=0)"
    exit 0
fi

script_dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
repo_root=$(CDPATH= cd -- "${script_dir}/.." && pwd)

export XCURSOR_THEME="${XCURSOR_THEME:-Adwaita}"
export XCURSOR_SIZE="${XCURSOR_SIZE:-24}"

# Development-only. Do not copy this into production session files.
export QT_QUICK_BACKEND="${QT_QUICK_BACKEND:-software}"

resolve_shell() {
    if [ -n "${NEBULA_SHELL:-}" ] && [ -x "${NEBULA_SHELL}" ]; then
        printf '%s\n' "${NEBULA_SHELL}"
        return 0
    fi

    for candidate in \
        "${repo_root}/shells/desktop/shell/build/nebula-shell" \
        "${repo_root}/build/nebula-shell" \
        "${PWD}/shells/desktop/shell/build/nebula-shell" \
        "${PWD}/build/nebula-shell"
    do
        if [ -x "${candidate}" ]; then
            printf '%s\n' "${candidate}"
            return 0
        fi
    done

    if command -v nebula-shell >/dev/null 2>&1; then
        command -v nebula-shell
        return 0
    fi

    return 1
}

if ! shell_bin=$(resolve_shell); then
    echo "nebula: nebula-shell not found." >&2
    echo "Build it with:" >&2
    echo "  cd shells/desktop/shell && cmake -S . -B build && cmake --build build -j\$(nproc)" >&2
    echo "Or set NEBULA_SHELL to the executable path." >&2
    exit 1
fi

echo "nebula: starting ${shell_bin} (QT_QUICK_BACKEND=${QT_QUICK_BACKEND})"
exec "${shell_bin}" "$@"