#!/bin/bash
# Build Dangerous Pi image using pi-gen
set -e

# Colors for output
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

# Configuration
PI_GEN_DIR="/home/work/pi-gen-builder"  # Official pi-gen builder
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PM3_STAGE_DIR="$SCRIPT_DIR/pi-gen/stagePM3"
DTPI_STAGE_DIR="$SCRIPT_DIR/pi-gen/stageDangerousPi"
CONFIG_FILE="$SCRIPT_DIR/pi-gen/config"
KEEP_CONTAINER=0

# Parse flags
for arg in "$@"; do
    case $arg in
        --keep-container)
            KEEP_CONTAINER=1
            shift
            ;;
    esac
done

# Verify pi-gen directory exists
if [ ! -d "$PI_GEN_DIR" ]; then
    echo "Error: pi-gen directory not found at $PI_GEN_DIR"
    echo "Please run: cd /home/work && git clone https://github.com/RPi-Distro/pi-gen.git pi-gen-builder"
    exit 1
fi

echo -e "${GREEN}Using pi-gen at: $PI_GEN_DIR${NC}"

# Build frontend
build_frontend() {
    echo -e "${GREEN}Building frontend...${NC}"
    cd "$SCRIPT_DIR/app/frontend"

    # Check if npm is available
    if ! command -v npm &> /dev/null; then
        echo -e "${YELLOW}WARNING: npm not found, skipping frontend build${NC}"
        echo -e "${YELLOW}Install Node.js to build frontend: https://nodejs.org/${NC}"
        cd "$SCRIPT_DIR"
        return 1
    fi

    # Install dependencies if needed
    if [ ! -d "node_modules" ]; then
        echo -e "${GREEN}Installing frontend dependencies...${NC}"
        npm install
    fi

    # Build the frontend
    echo -e "${GREEN}Running npm build...${NC}"
    npm run build

    echo -e "${GREEN}✓ Frontend build complete${NC}"
    cd "$SCRIPT_DIR"
    return 0
}

# Helper function to copy stages
copy_stages() {
    cd "$PI_GEN_DIR"

    # Copy config
    cp "$CONFIG_FILE" config

    # Copy PM3 stage
    rm -rf stagePM3
    cp -r "$PM3_STAGE_DIR" .

    # Copy DangerousPi stage
    rm -rf stageDangerousPi
    cp -r "$DTPI_STAGE_DIR" .

    # Remove intermediate image exports (we only want the final image)
    rm -f stage2/EXPORT_IMAGE

    # Build frontend before copying
    if build_frontend; then
        echo -e "${GREEN}Frontend built successfully${NC}"
    else
        echo -e "${YELLOW}Continuing without frontend build${NC}"
    fi

    # Return to pi-gen directory
    cd "$PI_GEN_DIR"

    # Copy Dangerous Pi source files into the stage
    echo -e "${GREEN}Copying Dangerous Pi source files...${NC}"
    mkdir -p stageDangerousPi/03-dangerous-pi/files
    cp -r "$SCRIPT_DIR/app" stageDangerousPi/03-dangerous-pi/files/
    cp -r "$SCRIPT_DIR/systemd" stageDangerousPi/03-dangerous-pi/files/
    cp -r "$SCRIPT_DIR/scripts" stageDangerousPi/03-dangerous-pi/files/
    cp "$SCRIPT_DIR/requirements.txt" stageDangerousPi/03-dangerous-pi/files/
}

# Build type
BUILD_TYPE="${1:-full}"

case "$BUILD_TYPE" in
    full)
        echo -e "${GREEN}Starting full build (all stages)...${NC}"

        # Remove container but KEEP the volume for caching
        if docker ps -a --filter name=pigen_work --format "{{.Names}}" | grep -q pigen_work; then
            echo -e "${YELLOW}Removing existing container (keeping cache)...${NC}"
            docker rm pigen_work > /dev/null 2>&1 || true
        fi

        copy_stages

        # Remove any SKIP files to ensure full build
        rm -f stage0/SKIP stage1/SKIP stage2/SKIP stagePM3/SKIP stageDangerousPi/SKIP

        # Full build (uses docker, no root needed)
        PIGEN_DOCKER_MODE=1 ./build-docker.sh
        ;;

    from-pm3)
        echo -e "${GREEN}Building from PM3 stage (PM3 + DangerousPi)...${NC}"
        copy_stages

        # Skip early stages if cached
        if ls work/*/stage2/*.qcow2 2>/dev/null | grep -q .; then
            echo -e "${GREEN}Found cached stage2, creating SKIP markers...${NC}"
            touch stage0/SKIP stage1/SKIP stage2/SKIP
            echo -e "${GREEN}Will build: stagePM3 → stageDangerousPi${NC}"
        else
            echo -e "${YELLOW}No cached stages found - will build all stages${NC}"
            rm -f stage0/SKIP stage1/SKIP stage2/SKIP
        fi

        # Ensure PM3 and DangerousPi stages build
        rm -f stagePM3/SKIP stageDangerousPi/SKIP

        # Build with continue flag
        CONTINUE=1 PIGEN_DOCKER_MODE=1 ./build-docker.sh
        ;;

    from-dtpi)
        echo -e "${GREEN}Building from DangerousPi stage (customizations only)...${NC}"
        copy_stages

        # Check for cached PM3 stage
        if ls work/*/stagePM3/*.qcow2 2>/dev/null | grep -q .; then
            echo -e "${GREEN}Found cached stagePM3, creating SKIP markers...${NC}"
            touch stage0/SKIP stage1/SKIP stage2/SKIP stagePM3/SKIP
            echo -e "${GREEN}Will build: stageDangerousPi only (~5 min)${NC}"
        else
            echo -e "${YELLOW}WARNING: No cached PM3 stage found!${NC}"
            echo -e "${YELLOW}You need to run './build-image.sh full' or './build-image.sh from-pm3' first${NC}"
            echo -e "${YELLOW}Falling back to full build from PM3...${NC}"
            touch stage0/SKIP stage1/SKIP stage2/SKIP
            rm -f stagePM3/SKIP
        fi

        # Ensure DangerousPi stage builds
        rm -f stageDangerousPi/SKIP

        # Build with continue flag
        CONTINUE=1 PIGEN_DOCKER_MODE=1 ./build-docker.sh
        ;;

    clean)
        echo -e "${YELLOW}Removing ALL build cache and container...${NC}"
        if docker ps -a --filter name=pigen_work --format "{{.Names}}" | grep -q pigen_work; then
            docker rm -v pigen_work > /dev/null 2>&1 || true
            echo -e "${GREEN}✓ Removed container and volume${NC}"
        else
            docker volume rm pigen_work > /dev/null 2>&1 || true
            echo -e "${GREEN}✓ Removed volume${NC}"
        fi
        echo ""
        echo "Cache wiped. Next build will be from scratch."
        exit 0
        ;;

    test)
        echo -e "${GREEN}Validating stage scripts...${NC}"

        # Syntax check - PM3 build
        bash -n "$PM3_STAGE_DIR/01-proxmark3/00-run-chroot.sh"

        # Syntax check - WiFi AP
        bash -n "$DTPI_STAGE_DIR/01-Wireless-AP/00-run-chroot.sh"

        # Syntax check - ttyd
        bash -n "$DTPI_STAGE_DIR/02-ttyd/00-run-chroot.sh"

        # Syntax check - Dangerous Pi
        bash -n "$DTPI_STAGE_DIR/03-dangerous-pi/00-run.sh"
        bash -n "$DTPI_STAGE_DIR/03-dangerous-pi/00-run-chroot.sh"
        bash -n "$DTPI_STAGE_DIR/03-dangerous-pi/01-run-chroot.sh"

        echo -e "${GREEN}✓ All scripts pass syntax validation${NC}"

        # Check required files exist
        [ -d "$(dirname "$0")/app" ] || { echo "Error: app/ directory not found"; exit 1; }
        [ -f "$(dirname "$0")/requirements.txt" ] || { echo "Error: requirements.txt not found"; exit 1; }
        [ -d "$(dirname "$0")/systemd" ] || { echo "Error: systemd/ directory not found"; exit 1; }

        echo -e "${GREEN}✓ All required files exist${NC}"
        ;;

    *)
        echo "Usage: $0 {full|from-pm3|from-dtpi|test|clean} [--keep-container]"
        echo ""
        echo "Build Commands:"
        echo "  full      - Build all stages (~1 hour first time, cached after)"
        echo "              Use for: First build or when base system needs updates"
        echo "              ✓ Preserves cache for fast rebuilds"
        echo ""
        echo "  from-pm3  - Rebuild PM3 + customizations (~15 min with cache)"
        echo "              Use for: Updating Proxmark3 firmware/client"
        echo "              Skips: stage0, stage1, stage2 (uses cache)"
        echo ""
        echo "  from-dtpi - Rebuild only customizations (~5 min) ⭐"
        echo "              Use for: Daily development, app changes"
        echo "              Skips: stage0, stage1, stage2, stagePM3 (uses cache)"
        echo "              Requires: Previous 'full' or 'from-pm3' build"
        echo ""
        echo "Utility Commands:"
        echo "  test      - Validate all scripts without building"
        echo "  clean     - Wipe ALL cache (next build will be from scratch)"
        echo ""
        echo "Flags:"
        echo "  --keep-container  - Keep Docker container after build (for debugging)"
        echo "                      Default: Auto-cleanup container, preserve cache"
        echo ""
        echo "Cache Info:"
        echo "  All builds now preserve cache in Docker volume 'pigen_work'"
        echo "  Use 'clean' only if you need to completely start over"
        echo ""
        echo "Stage Structure:"
        echo "  stage0, stage1, stage2  → Base Raspberry Pi OS (cached)"
        echo "  stagePM3                → Proxmark3 build (cached)"
        echo "  stageDangerousPi        → WiFi AP + ttyd + your app"
        exit 1
        ;;
esac

echo -e "${GREEN}Build complete!${NC}"
echo "Image location: $PI_GEN_DIR/deploy/"

# Clean up container but preserve work volume for future builds
if [ $KEEP_CONTAINER -eq 0 ]; then
    if docker ps -a --filter name=pigen_work --format "{{.Names}}" | grep -q pigen_work; then
        echo -e "${GREEN}Cleaning up build container (preserving cache)...${NC}"
        docker rm pigen_work > /dev/null 2>&1
        echo -e "${GREEN}✓ Container removed, cache preserved for fast rebuilds${NC}"
    fi
else
    echo -e "${YELLOW}Container kept for debugging (--keep-container flag)${NC}"
    echo "Inspect with: docker exec -it pigen_work bash"
    echo "Remove with: docker rm -v pigen_work"
fi