#!/usr/bin/env bash
# build.sh — wrapper for Mestre Buildroot builds.
#
# Usage:
#   ./scripts/build.sh                  # full build
#   ./scripts/build.sh menuconfig       # Buildroot menuconfig
#   ./scripts/build.sh linux-menuconfig # Linux kernel menuconfig
#   ./scripts/build.sh uboot-menuconfig # U-Boot menuconfig
#   ./scripts/build.sh <pkg>-rebuild    # Force-rebuild a single package
#   ./scripts/build.sh clean            # Clean build output
#   ./scripts/build.sh -- -j4           # Pass arbitrary args through to make
#
# On first invocation, the build directory is created and configured from
# the mestre_x6200_defconfig. Subsequent invocations reuse the existing
# build directory.

set -euo pipefail

REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
BUILD_DIR="$REPO_ROOT/build"
BR2_EXTERNAL="$REPO_ROOT/br2_external"
DEFCONFIG="mestre_x6200_defconfig"

# ---------------------------------------------------------------------------
# Sanity check: submodule must be present
# ---------------------------------------------------------------------------
if [ ! -f "$REPO_ROOT/buildroot/Makefile" ]; then
    echo "!!! Buildroot submodule not initialized."
    echo "    Run: ./scripts/setup.sh"
    exit 1
fi

# ---------------------------------------------------------------------------
# First-time configuration
# ---------------------------------------------------------------------------
if [ ! -f "$BUILD_DIR/.config" ]; then
    if [ ! -f "$BR2_EXTERNAL/configs/$DEFCONFIG" ]; then
        echo "!!! Defconfig not found: $BR2_EXTERNAL/configs/$DEFCONFIG"
        echo "    The defconfig hasn't been added yet. See the project's"
        echo "    milestone status in README.md."
        exit 1
    fi

    echo ">>> First-time configuration: $DEFCONFIG"
    mkdir -p "$BUILD_DIR"
    make -C "$REPO_ROOT/buildroot" \
         BR2_EXTERNAL="$BR2_EXTERNAL" \
         O="$BUILD_DIR" \
         "$DEFCONFIG"
    echo
fi

# ---------------------------------------------------------------------------
# Run make in the build directory
# ---------------------------------------------------------------------------
# Default to plain `make` if no extra args were passed.
if [ $# -eq 0 ]; then
    make -C "$BUILD_DIR"
else
    make -C "$BUILD_DIR" "$@"
fi