#!/bin/sh
# SecuBox Lyrion manager - Multi-runtime support (Docker/LXC)
# Copyright (C) 2024 CyberMind.fr

CONFIG="lyrion"
CONTAINER_NAME="secbx-lyrion"
LXC_NAME="lyrion"
OPKG_UPDATED=0

# Paths
LXC_PATH="/srv/lxc"
LXC_ROOTFS="$LXC_PATH/$LXC_NAME/rootfs"
LXC_CONFIG="$LXC_PATH/$LXC_NAME/config"
LYRION_ROOTFS_SCRIPT="/usr/share/lyrion/create-lxc-rootfs.sh"

usage() {
	cat <<'EOF'
Usage: lyrionctl <command>

Commands:
  install         Install prerequisites, prep folders, pull/create container
  check           Run prerequisite checks (storage, runtime)
  update          Update container image and restart service
  destroy         Remove container and rootfs (for reinstall)
  status          Show container status
  logs            Show container logs (use -f to follow)
  shell           Open shell in container
  service-run     Internal: run container under procd
  service-stop    Stop container
  runtime         Show detected/configured runtime

Runtime Selection:
  The runtime can be configured in /etc/config/lyrion:
    option runtime 'auto'    # auto-detect (LXC preferred if available)
    option runtime 'docker'  # Force Docker
    option runtime 'lxc'     # Force LXC
EOF
}

require_root() { [ "$(id -u)" -eq 0 ] || { echo "Root required" >&2; exit 1; }; }

log_info() { echo "[INFO] $*"; }
log_warn() { echo "[WARN] $*" >&2; }
log_error() { echo "[ERROR] $*" >&2; }

uci_get() { uci -q get ${CONFIG}.main.$1; }
uci_set() { uci set ${CONFIG}.main.$1="$2" && uci commit ${CONFIG}; }

# Load configuration with defaults
load_config() {
	runtime="$(uci_get runtime || echo auto)"
	image="$(uci_get image || echo ghcr.io/lms-community/lyrionmusicserver:stable)"
	data_path="$(uci_get data_path || echo /srv/lyrion)"
	media_path="$(uci_get media_path || echo /srv/media)"
	port="$(uci_get port || echo 9000)"
	timezone="$(uci_get timezone || cat /etc/TZ 2>/dev/null || echo UTC)"
	memory_limit="$(uci_get memory_limit || echo 256M)"
	lxc_rootfs_url="$(uci_get lxc_rootfs_url || echo '')"
}

ensure_dir() { [ -d "$1" ] || mkdir -p "$1"; }

# Check if a runtime is available
has_docker() {
	command -v docker >/dev/null 2>&1 && \
	command -v dockerd >/dev/null 2>&1 && \
	[ -S /var/run/docker.sock ]
}

has_lxc() {
	command -v lxc-start >/dev/null 2>&1 && \
	command -v lxc-stop >/dev/null 2>&1
}

# Detect best available runtime
detect_runtime() {
	load_config

	case "$runtime" in
		docker)
			if has_docker; then
				echo "docker"
			else
				log_error "Docker requested but not available"
				return 1
			fi
			;;
		lxc)
			if has_lxc; then
				echo "lxc"
			else
				log_error "LXC requested but not available"
				return 1
			fi
			;;
		auto|*)
			# Prefer LXC if available (lighter weight)
			if has_lxc; then
				echo "lxc"
			elif has_docker; then
				echo "docker"
			else
				log_error "No container runtime available (install lxc or docker)"
				return 1
			fi
			;;
	esac
}

# Ensure required packages are installed
ensure_packages() {
	require_root
	for pkg in "$@"; do
		if ! opkg list-installed | grep -q "^$pkg "; then
			if [ "$OPKG_UPDATED" -eq 0 ]; then
				opkg update || return 1
				OPKG_UPDATED=1
			fi
			opkg install "$pkg" || return 1
		fi
	done
}

# =============================================================================
# Docker Runtime Functions
# =============================================================================

docker_check_prereqs() {
	log_info "Checking Docker prerequisites..."
	ensure_packages dockerd docker containerd || return 1

	# Enable and start Docker
	/etc/init.d/dockerd enable >/dev/null 2>&1
	if ! /etc/init.d/dockerd status >/dev/null 2>&1; then
		/etc/init.d/dockerd start || return 1
		sleep 3
	fi

	# Wait for Docker socket
	local retry=0
	while [ ! -S /var/run/docker.sock ] && [ $retry -lt 30 ]; do
		sleep 1
		retry=$((retry + 1))
	done

	[ -S /var/run/docker.sock ] || { log_error "Docker socket not available"; return 1; }
	log_info "Docker ready"
}

docker_pull() {
	load_config
	log_info "Pulling Docker image: $image"
	docker pull "$image"
}

docker_stop() {
	docker stop "$CONTAINER_NAME" >/dev/null 2>&1 || true
	docker rm "$CONTAINER_NAME" >/dev/null 2>&1 || true
}

docker_run() {
	load_config
	docker_stop

	log_info "Starting Lyrion Docker container..."
	exec docker run --rm \
		--name "$CONTAINER_NAME" \
		-p "${port}:9000" \
		-p "3483:3483" \
		-p "3483:3483/udp" \
		-v "$data_path:/config" \
		-v "$media_path:/music:ro" \
		-e TZ="$timezone" \
		--memory="$memory_limit" \
		"$image"
}

docker_status() {
	docker ps -a --filter "name=$CONTAINER_NAME" --format "table {{.Names}}\t{{.Status}}\t{{.Ports}}"
}

docker_logs() {
	docker logs "$@" "$CONTAINER_NAME"
}

docker_shell() {
	docker exec -it "$CONTAINER_NAME" /bin/sh
}

# =============================================================================
# LXC Runtime Functions
# =============================================================================

lxc_check_prereqs() {
	log_info "Checking LXC prerequisites..."
	ensure_packages lxc lxc-common lxc-attach lxc-start lxc-stop lxc-destroy || return 1

	# Check cgroups
	if [ ! -d /sys/fs/cgroup ]; then
		log_error "cgroups not mounted at /sys/fs/cgroup"
		return 1
	fi

	log_info "LXC ready"
}

lxc_create_rootfs() {
	load_config

	# Check for COMPLETE installation (Lyrion installed, not just Alpine)
	if [ -d "$LXC_ROOTFS" ] && [ -f "$LXC_ROOTFS/opt/lyrion/slimserver.pl" ] && [ -f "$LXC_CONFIG" ]; then
		log_info "LXC rootfs already exists with Lyrion installed"
		return 0
	fi

	# Check for incomplete installation (Alpine exists but Lyrion not installed)
	if [ -d "$LXC_ROOTFS" ] && [ -f "$LXC_ROOTFS/etc/alpine-release" ] && [ ! -f "$LXC_ROOTFS/opt/lyrion/slimserver.pl" ]; then
		log_warn "Incomplete installation detected (Alpine downloaded but Lyrion not installed)"
		log_info "Cleaning up incomplete rootfs..."
		rm -rf "$LXC_PATH/$LXC_NAME"
	fi

	log_info "Creating LXC rootfs for Lyrion..."
	ensure_dir "$LXC_PATH/$LXC_NAME"

	# Use external script if available
	if [ -x "$LYRION_ROOTFS_SCRIPT" ]; then
		"$LYRION_ROOTFS_SCRIPT" "$LXC_ROOTFS" || return 1
	else
		# Inline rootfs creation
		lxc_create_alpine_rootfs || return 1
	fi

	# Verify Lyrion was actually installed
	if [ ! -f "$LXC_ROOTFS/opt/lyrion/slimserver.pl" ]; then
		log_error "Lyrion installation failed - slimserver.pl not found"
		log_error "Check network connectivity and try again"
		return 1
	fi

	# Create LXC config
	lxc_create_config || return 1

	log_info "LXC rootfs created successfully"
}

lxc_create_alpine_rootfs() {
	local arch="aarch64"
	local alpine_version="3.19"
	local mirror="https://dl-cdn.alpinelinux.org/alpine"
	local rootfs="$LXC_ROOTFS"

	# Detect architecture
	case "$(uname -m)" in
		x86_64) arch="x86_64" ;;
		aarch64) arch="aarch64" ;;
		armv7l) arch="armv7" ;;
		*) arch="x86_64" ;;
	esac

	log_info "Downloading Alpine Linux $alpine_version ($arch)..."

	ensure_dir "$rootfs"
	cd "$rootfs" || return 1

	# Download Alpine minirootfs
	local rootfs_url="$mirror/v$alpine_version/releases/$arch/alpine-minirootfs-$alpine_version.0-$arch.tar.gz"
	wget -q -O /tmp/alpine-rootfs.tar.gz "$rootfs_url" || {
		log_error "Failed to download Alpine rootfs"
		return 1
	}

	# Extract rootfs
	tar xzf /tmp/alpine-rootfs.tar.gz -C "$rootfs" || return 1
	rm -f /tmp/alpine-rootfs.tar.gz

	# Configure Alpine
	echo "nameserver 8.8.8.8" > "$rootfs/etc/resolv.conf"

	# Install Lyrion in the container
	cat > "$rootfs/tmp/setup-lyrion.sh" << 'SETUP'
#!/bin/sh
set -e

# Update and install dependencies
apk update
apk add --no-cache \
    perl \
    perl-io-socket-ssl \
    perl-encode \
    perl-xml-parser \
    perl-xml-simple \
    perl-dbi \
    perl-dbd-sqlite \
    perl-json-xs \
    perl-yaml-libyaml \
    perl-crypt-openssl-rsa \
    perl-ev \
    perl-anyevent \
    perl-gd \
    perl-digest-sha1 \
    perl-sub-name \
    perl-html-parser \
    perl-template-toolkit \
    perl-file-slurp \
    imagemagick \
    flac \
    faad2 \
    sox \
    lame \
    curl \
    wget

# Download and install Lyrion
cd /tmp

# Detect architecture for appropriate tarball
LYRION_ARCH=""
case "$(uname -m)" in
    aarch64|arm*) LYRION_ARCH="arm-linux" ;;
esac

# Try ARM-specific tarball first (smaller ~60MB), then fall back to multi-arch (~126MB)
echo "Downloading Lyrion Music Server..."
LYRION_URL=""
if [ -n "$LYRION_ARCH" ]; then
    LYRION_URL="https://downloads.lms-community.org/LyrionMusicServer_v9.0.3/lyrionmusicserver-9.0.3-${LYRION_ARCH}.tgz"
else
    LYRION_URL="https://downloads.lms-community.org/LyrionMusicServer_v9.0.3/lyrionmusicserver-9.0.3.tgz"
fi

echo "URL: $LYRION_URL"
wget -O lyrion.tar.gz "$LYRION_URL" || {
    echo "Primary download failed, trying multi-arch tarball..."
    LYRION_URL="https://downloads.lms-community.org/LyrionMusicServer_v9.0.3/lyrionmusicserver-9.0.3.tgz"
    wget -O lyrion.tar.gz "$LYRION_URL" || {
        echo "ERROR: All download attempts failed"
        exit 1
    }
}

# Verify download succeeded
if [ ! -f lyrion.tar.gz ] || [ ! -s lyrion.tar.gz ]; then
    echo "ERROR: Failed to download Lyrion tarball"
    exit 1
fi

mkdir -p /opt/lyrion
tar xzf lyrion.tar.gz -C /opt/lyrion --strip-components=1 || {
    echo "ERROR: Failed to extract Lyrion tarball"
    exit 1
}
rm -f lyrion.tar.gz

# Remove conflicting bundled CPAN modules (use system modules instead)
rm -rf /opt/lyrion/CPAN/arch
rm -rf /opt/lyrion/CPAN/XML/Parser*
rm -rf /opt/lyrion/CPAN/Image
rm -rf /opt/lyrion/CPAN/DBD
rm -rf /opt/lyrion/CPAN/DBI /opt/lyrion/CPAN/DBI.pm
rm -rf /opt/lyrion/CPAN/YAML
rm -rf /opt/lyrion/CPAN/Template /opt/lyrion/CPAN/Template.pm

# Create stub Image::Scale module (artwork resizing - optional)
mkdir -p /opt/lyrion/CPAN/Image
cat > /opt/lyrion/CPAN/Image/Scale.pm << 'STUB'
package Image::Scale;
our $VERSION = '0.08';
sub new { return bless {}, shift }
sub resize { return 1 }
sub width { return 0 }
sub height { return 0 }
1;
STUB

# Create stub Devel::Peek module (runtime inspection - optional)
mkdir -p /opt/lyrion/CPAN/Devel
cat > /opt/lyrion/CPAN/Devel/Peek.pm << 'STUB'
package Devel::Peek;
use strict;
our $VERSION = '1.32';
our $ANON_GV;
{ no strict 'refs'; $ANON_GV = \*{'Devel::Peek::ANON'}; }
sub Dump { }
sub DumpArray { }
sub SvREFCNT { return 1 }
sub DeadCode { }
sub mstat { }
sub fill_mstats { }
sub SvROK { return 0 }
sub CvGV { return $ANON_GV }
1;
STUB

# Create directories with proper permissions for nobody user
mkdir -p /config/prefs/plugin /config/cache /music /var/log/lyrion
chown -R nobody:nobody /config /var/log/lyrion

# Create startup script that runs as nobody user
cat > /opt/lyrion/start.sh << 'START'
#!/bin/sh
cd /opt/lyrion

# Ensure directories exist with proper permissions
mkdir -p /config/prefs/plugin /config/cache /var/log/lyrion
chown -R nobody:nobody /config /var/log/lyrion /opt/lyrion 2>/dev/null || true

# Run Lyrion as nobody user to avoid permission issues
exec su -s /bin/sh nobody -c "cd /opt/lyrion && exec perl slimserver.pl \
    --prefsdir /config/prefs \
    --cachedir /config/cache \
    --logdir /var/log/lyrion \
    --httpport 9000 \
    --cliport 9090"
START
chmod +x /opt/lyrion/start.sh

echo "Lyrion installed successfully"
SETUP

	chmod +x "$rootfs/tmp/setup-lyrion.sh"

	# Run setup in chroot
	log_info "Installing Lyrion in container (this may take a while)..."
	chroot "$rootfs" /tmp/setup-lyrion.sh || {
		log_error "Failed to install Lyrion in container"
		return 1
	}

	rm -f "$rootfs/tmp/setup-lyrion.sh"
}

lxc_create_config() {
	load_config

	cat > "$LXC_CONFIG" << EOF
# Lyrion LXC Configuration
lxc.uts.name = $LXC_NAME

# Root filesystem
lxc.rootfs.path = dir:$LXC_ROOTFS

# Network - use host network for simplicity
lxc.net.0.type = none

# Mounts
lxc.mount.auto = proc:mixed sys:ro cgroup:mixed
lxc.mount.entry = $data_path config none bind,create=dir 0 0
lxc.mount.entry = $media_path music none bind,ro,create=dir 0 0

# Capabilities
lxc.cap.drop = sys_admin sys_module mac_admin mac_override

# cgroups limits
lxc.cgroup.memory.limit_in_bytes = $memory_limit

# Init
lxc.init.cmd = /opt/lyrion/start.sh

# Console
lxc.console.size = 1024
lxc.pty.max = 1024
EOF

	log_info "LXC config created at $LXC_CONFIG"
}

lxc_stop() {
	if lxc-info -n "$LXC_NAME" >/dev/null 2>&1; then
		lxc-stop -n "$LXC_NAME" -k >/dev/null 2>&1 || true
	fi
}

lxc_run() {
	load_config
	lxc_stop

	if [ ! -f "$LXC_CONFIG" ]; then
		log_error "LXC not configured. Run 'lyrionctl install' first."
		return 1
	fi

	# Ensure mount points exist
	ensure_dir "$data_path"
	ensure_dir "$media_path"

	log_info "Starting Lyrion LXC container..."
	exec lxc-start -n "$LXC_NAME" -F -f "$LXC_CONFIG"
}

lxc_status() {
	if lxc-info -n "$LXC_NAME" >/dev/null 2>&1; then
		lxc-info -n "$LXC_NAME"
	else
		echo "LXC container '$LXC_NAME' not found or not configured"
	fi
}

lxc_logs() {
	load_config
	local logfile="$LXC_ROOTFS/var/log/lyrion/server.log"

	# Also check container logs via lxc-attach if container is running
	if lxc-info -n "$LXC_NAME" -s 2>/dev/null | grep -q "RUNNING"; then
		if [ "$1" = "-f" ]; then
			lxc-attach -n "$LXC_NAME" -- tail -f /var/log/lyrion/server.log
		else
			lxc-attach -n "$LXC_NAME" -- tail -100 /var/log/lyrion/server.log
		fi
	elif [ -f "$logfile" ]; then
		if [ "$1" = "-f" ]; then
			tail -f "$logfile"
		else
			tail -100 "$logfile"
		fi
	else
		log_warn "Container not running and no log file found"
		log_info "Start the service with: /etc/init.d/lyrion start"
	fi
}

lxc_shell() {
	lxc-attach -n "$LXC_NAME" -- /bin/sh
}

lxc_destroy() {
	lxc_stop
	if [ -d "$LXC_PATH/$LXC_NAME" ]; then
		rm -rf "$LXC_PATH/$LXC_NAME"
		log_info "LXC container destroyed"
	fi
}

# =============================================================================
# Main Commands
# =============================================================================

cmd_install() {
	require_root
	load_config

	local rt=$(detect_runtime) || exit 1
	log_info "Using runtime: $rt"

	# Save detected runtime if auto
	[ "$runtime" = "auto" ] && uci_set detected_runtime "$rt"

	# Create directories
	ensure_dir "$data_path"
	ensure_dir "$media_path"

	case "$rt" in
		docker)
			docker_check_prereqs || exit 1
			docker_pull || exit 1
			;;
		lxc)
			lxc_check_prereqs || exit 1
			lxc_create_rootfs || exit 1
			;;
	esac

	uci_set enabled '1'
	/etc/init.d/lyrion enable

	log_info "Lyrion installed. Start with: /etc/init.d/lyrion start"
	log_info "Web interface will be at: http://<router-ip>:$port"
}

cmd_check() {
	load_config

	log_info "Checking prerequisites..."
	log_info "Configured runtime: $runtime"

	local rt=$(detect_runtime)
	if [ -n "$rt" ]; then
		log_info "Detected runtime: $rt"
		case "$rt" in
			docker) docker_check_prereqs ;;
			lxc) lxc_check_prereqs ;;
		esac
	fi
}

cmd_update() {
	require_root
	load_config

	local rt=$(detect_runtime) || exit 1

	case "$rt" in
		docker)
			docker_pull || exit 1
			;;
		lxc)
			log_info "Updating LXC rootfs..."
			lxc_destroy
			lxc_create_rootfs || exit 1
			;;
	esac

	if /etc/init.d/lyrion enabled >/dev/null 2>&1; then
		/etc/init.d/lyrion restart
	else
		log_info "Update complete. Restart manually to apply."
	fi
}

cmd_destroy() {
	require_root
	load_config

	local rt=$(detect_runtime 2>/dev/null)

	case "$rt" in
		docker)
			docker_stop
			log_info "Docker container stopped. Image kept for reinstall."
			log_info "To remove image: docker rmi $image"
			;;
		lxc)
			lxc_destroy
			;;
		*)
			# No runtime detected, but try to clean up LXC anyway
			if [ -d "$LXC_PATH/$LXC_NAME" ]; then
				log_info "Removing LXC rootfs..."
				rm -rf "$LXC_PATH/$LXC_NAME"
				log_info "LXC container destroyed"
			else
				log_info "No container found to destroy"
			fi
			;;
	esac

	log_info "To reinstall: lyrionctl install"
}

cmd_status() {
	local rt=$(detect_runtime 2>/dev/null)
	case "$rt" in
		docker) docker_status ;;
		lxc) lxc_status ;;
		*) echo "No runtime detected" ;;
	esac
}

cmd_logs() {
	local rt=$(detect_runtime 2>/dev/null)
	case "$rt" in
		docker) docker_logs "$@" ;;
		lxc) lxc_logs "$@" ;;
		*) echo "No runtime detected" ;;
	esac
}

cmd_shell() {
	local rt=$(detect_runtime 2>/dev/null)
	case "$rt" in
		docker) docker_shell ;;
		lxc) lxc_shell ;;
		*) echo "No runtime detected" ;;
	esac
}

cmd_service_run() {
	require_root
	load_config

	local rt=$(detect_runtime) || exit 1

	case "$rt" in
		docker)
			docker_check_prereqs || exit 1
			docker_run
			;;
		lxc)
			lxc_check_prereqs || exit 1
			lxc_run
			;;
	esac
}

cmd_service_stop() {
	require_root
	local rt=$(detect_runtime 2>/dev/null)
	case "$rt" in
		docker) docker_stop ;;
		lxc) lxc_stop ;;
	esac
}

cmd_runtime() {
	load_config
	echo "Configured: $runtime"

	local detected=$(detect_runtime 2>/dev/null)
	if [ -n "$detected" ]; then
		echo "Detected: $detected"
	else
		echo "Detected: none"
	fi

	echo ""
	echo "Available runtimes:"
	has_docker && echo "  - docker" || echo "  - docker (not installed)"
	has_lxc && echo "  - lxc" || echo "  - lxc (not installed)"
}

# =============================================================================
# Main Entry Point
# =============================================================================

case "${1:-}" in
	install) shift; cmd_install "$@" ;;
	check) shift; cmd_check "$@" ;;
	update) shift; cmd_update "$@" ;;
	destroy) shift; cmd_destroy "$@" ;;
	status) shift; cmd_status "$@" ;;
	logs) shift; cmd_logs "$@" ;;
	shell) shift; cmd_shell "$@" ;;
	service-run) shift; cmd_service_run "$@" ;;
	service-stop) shift; cmd_service_stop "$@" ;;
	runtime) shift; cmd_runtime "$@" ;;
	help|--help|-h|'') usage ;;
	*) echo "Unknown command: $1" >&2; usage >&2; exit 1 ;;
esac