#!/bin/bash
set -euo pipefail

# ============================================================================
# build_nix.sh — ChatGUI build (Linux / FreeBSD)
#
#   ./build_nix.sh            quick (incremental) build
#   ./build_nix.sh --full     "под ключ": deps + clean + configure + build
#   ./build_nix.sh -jN        parallel jobs
#   ./build_nix.sh --asan     build with AddressSanitizer
# ============================================================================

SRC_DIR="$(cd "$(dirname "$0")" && pwd)"
BUILD_DIR="$SRC_DIR/build"

FULL=0
ASAN=0
JOBS=""

usage() {
    echo "Usage: $0 [--full] [-jN] [--asan]"
    echo "  --full   install deps + clean rebuild (all-in-one)"
    echo "  -jN      parallel build jobs (default: CPU count)"
    echo "  --asan   build with AddressSanitizer"
    exit 0
}

for arg; do
    case "$arg" in
        --full) FULL=1 ;;
        --asan) ASAN=1 ;;
        -j*) JOBS="${arg#-j}" ;;
        --jobs=*) JOBS="${arg#--jobs=}" ;;
        -h|--help) usage ;;
        *) echo "Unknown option: $arg" >&2; usage ;;
    esac
done

OS_NAME="$(uname -s)"
case "$OS_NAME" in
    Linux)   OS_ID=linux; ;;
    FreeBSD) OS_ID=bsd;   ;;
    *) echo "Unsupported OS: $OS_NAME (supported: Linux, FreeBSD)" >&2; exit 1 ;;
esac

if [ -z "$JOBS" ]; then
    if [ "$OS_ID" = linux ]; then
        JOBS="$(nproc)"
    else
        JOBS="$(sysctl -n hw.ncpu)"
    fi
fi

install_deps() {
    echo "[deps] installing build dependencies..."
    if [ "$OS_ID" = linux ]; then
        sudo apt-get update
        sudo apt-get install -y build-essential cmake qt6-base-dev librlottie-dev zlib1g-dev libssl-dev \
            libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libswresample-dev
    else
        sudo pkg install -y cmake qt6-base rlottie openssl ffmpeg
    fi
}

# Auto-detect FFmpeg (optional video transcoding). CMake finds it via pkg-config.
if command -v pkg-config >/dev/null 2>&1 && \
   pkg-config --exists libavformat libavcodec libavutil libswscale libswresample 2>/dev/null; then
    echo "[ffmpeg] detected — video transcoding enabled"
else
    echo "[ffmpeg] not found — video transcoding disabled"
fi

SAN_FLAGS="-fsanitize=address -fno-omit-frame-pointer -g"
if [ "$ASAN" -eq 1 ]; then
    echo "[build] ASAN ENABLED"
    CMAKE_ARGS=(-DCMAKE_C_FLAGS="$SAN_FLAGS" -DCMAKE_CXX_FLAGS="$SAN_FLAGS" -DCMAKE_EXE_LINKER_FLAGS=-fsanitize=address)
else
    CMAKE_ARGS=()
fi

if [ "$FULL" -eq 1 ]; then
    install_deps
    echo "[build] clean rebuild..."
    rm -rf "$BUILD_DIR"
fi

if [ ! -f "$BUILD_DIR/CMakeCache.txt" ] || [ "$ASAN" -eq 1 ]; then
    cmake -S "$SRC_DIR" -B "$BUILD_DIR" "${CMAKE_ARGS[@]}"
fi

cmake --build "$BUILD_DIR" -j"$JOBS"

echo ""
if [ "$ASAN" -eq 1 ]; then
    echo "OK. Run: ASAN_OPTIONS=detect_leaks=1:halt_on_error=0 $BUILD_DIR/vibechat"
else
    echo "OK. Run: $BUILD_DIR/vibechat"
fi