#!/bin/sh
# Network Tweaks - Auto Proxy DNS & Hosts Synchronization
# Reads enabled vhosts and generates DNS/hosts entries

. /lib/functions.sh

CONFIG_TWEAKS="network_tweaks"
CONFIG_VHOSTS="vhosts"
DNSMASQ_VHOST_CONF="/tmp/dnsmasq.d/50-vhosts.conf"
HOSTS_VHOST="/tmp/hosts.vhosts"
MANAGED_MARKER="# Managed by network-tweaks"

log_msg() {
	logger -t network-tweaks "$@"
	echo "[network-tweaks] $@" >&2
}

get_lan_ip() {
	local iface="${1:-lan}"
	local ip
	ip=$(uci -q get network.$iface.ipaddr)
	if [ -z "$ip" ]; then
		ip=$(ip -4 addr show br-$iface 2>/dev/null | grep -oP '(?<=inet\s)\d+(\.\d+){3}' | head -1)
	fi
	echo "${ip:-127.0.0.1}"
}

is_enabled() {
	local enabled
	enabled=$(uci -q get ${CONFIG_TWEAKS}.global.enabled)
	[ "$enabled" = "1" ] || [ "$enabled" = "true" ]
}

should_sync_hosts() {
	local sync
	sync=$(uci -q get ${CONFIG_TWEAKS}.global.sync_hosts)
	[ "$sync" = "1" ] || [ "$sync" = "true" ]
}

should_sync_dnsmasq() {
	local sync
	sync=$(uci -q get ${CONFIG_TWEAKS}.global.sync_dnsmasq)
	[ "$sync" = "1" ] || [ "$sync" = "true" ]
}

get_default_ip() {
	local ip
	ip=$(uci -q get ${CONFIG_TWEAKS}.global.default_ip)
	if [ -z "$ip" ]; then
		local iface
		iface=$(uci -q get ${CONFIG_TWEAKS}.global.lan_interface)
		ip=$(get_lan_ip "${iface:-lan}")
	fi
	echo "$ip"
}

collect_enabled_vhosts() {
	local domains=""
	local count=0

	config_load "$CONFIG_VHOSTS"

	collect_vhost() {
		local section="$1"
		local domain enabled

		config_get domain "$section" domain
		config_get_bool enabled "$section" enabled 1

		if [ "$enabled" = "1" ] && [ -n "$domain" ]; then
			domains="$domains $domain"
			count=$((count + 1))
		fi
	}

	config_foreach collect_vhost vhost

	echo "$domains"
	log_msg "Collected $count enabled vhost(s)"
}

generate_dnsmasq_conf() {
	local domains="$1"
	local ip="$2"
	local tmpfile="${DNSMASQ_VHOST_CONF}.tmp"

	mkdir -p "$(dirname "$DNSMASQ_VHOST_CONF")"

	cat > "$tmpfile" <<EOF
# Auto-generated DNS entries for VHost Manager domains
$MANAGED_MARKER
# IP: $ip
# Generated: $(date)

EOF

	for domain in $domains; do
		echo "address=/$domain/$ip" >> "$tmpfile"
	done

	mv "$tmpfile" "$DNSMASQ_VHOST_CONF"
	log_msg "Generated dnsmasq config with $(echo $domains | wc -w) entries"
}

generate_hosts_entries() {
	local domains="$1"
	local ip="$2"
	local tmpfile="${HOSTS_VHOST}.tmp"

	cat > "$tmpfile" <<EOF
$MANAGED_MARKER
# Auto-generated hosts entries for VHost Manager domains
# Generated: $(date)
EOF

	for domain in $domains; do
		echo "$ip $domain" >> "$tmpfile"
	done

	mv "$tmpfile" "$HOSTS_VHOST"

	# Merge with main hosts file
	if [ -f /etc/hosts ]; then
		# Remove old managed entries
		sed -i "/^$MANAGED_MARKER\$/,/^[^#]/d" /etc/hosts 2>/dev/null || true
		sed -i "/^# Auto-generated hosts entries for VHost Manager/d" /etc/hosts 2>/dev/null || true

		# Append new entries
		if [ -s "$HOSTS_VHOST" ]; then
			cat "$HOSTS_VHOST" >> /etc/hosts
		fi
	fi

	log_msg "Updated /etc/hosts with $(echo $domains | wc -w) entries"
}

reload_services() {
	local reload_dnsmasq="$1"

	if [ "$reload_dnsmasq" = "1" ]; then
		# Check if dnsmasq is running
		if /etc/init.d/dnsmasq enabled 2>/dev/null; then
			log_msg "Reloading dnsmasq..."
			/etc/init.d/dnsmasq reload >/dev/null 2>&1 || {
				log_msg "Failed to reload dnsmasq, restarting..."
				/etc/init.d/dnsmasq restart >/dev/null 2>&1
			}
		fi
	fi
}

cleanup_entries() {
	log_msg "Cleaning up managed entries..."

	rm -f "$DNSMASQ_VHOST_CONF"
	rm -f "$HOSTS_VHOST"

	if [ -f /etc/hosts ]; then
		sed -i "/^$MANAGED_MARKER\$/,/^[^#]/d" /etc/hosts 2>/dev/null || true
		sed -i "/^# Auto-generated hosts entries for VHost Manager/d" /etc/hosts 2>/dev/null || true
	fi

	reload_services 1
	log_msg "Cleanup complete"
}

sync_all() {
	log_msg "Starting network tweaks synchronization..."

	if ! is_enabled; then
		log_msg "Network tweaks disabled, cleaning up..."
		cleanup_entries
		return 0
	fi

	local domains
	domains=$(collect_enabled_vhosts)

	if [ -z "$domains" ]; then
		log_msg "No enabled vhosts found, cleaning up..."
		cleanup_entries
		return 0
	fi

	local ip
	ip=$(get_default_ip)
	log_msg "Using IP: $ip"

	local reload_needed=0

	if should_sync_dnsmasq; then
		generate_dnsmasq_conf "$domains" "$ip"
		reload_needed=1
	fi

	if should_sync_hosts; then
		generate_hosts_entries "$domains" "$ip"
	fi

	reload_services "$reload_needed"

	log_msg "Synchronization complete"
}

status_report() {
	echo "Network Tweaks Status"
	echo "===================="
	echo ""
	echo "Enabled: $(is_enabled && echo 'Yes' || echo 'No')"
	echo "Sync Hosts: $(should_sync_hosts && echo 'Yes' || echo 'No')"
	echo "Sync DNSmasq: $(should_sync_dnsmasq && echo 'Yes' || echo 'No')"
	echo "Default IP: $(get_default_ip)"
	echo ""
	echo "Enabled VHosts:"
	collect_enabled_vhosts | tr ' ' '\n' | grep -v '^$' | sed 's/^/  - /'
	echo ""

	if [ -f "$DNSMASQ_VHOST_CONF" ]; then
		echo "DNSmasq config exists: $DNSMASQ_VHOST_CONF"
		echo "  Entries: $(grep -c '^address=' "$DNSMASQ_VHOST_CONF" 2>/dev/null || echo 0)"
	else
		echo "DNSmasq config: Not generated"
	fi

	if [ -f "$HOSTS_VHOST" ]; then
		echo "Hosts entries exist: $HOSTS_VHOST"
		echo "  Lines: $(grep -cv '^#' "$HOSTS_VHOST" 2>/dev/null || echo 0)"
	else
		echo "Hosts entries: Not generated"
	fi
}

case "${1:-sync}" in
	sync)
		sync_all
		;;
	status)
		status_report
		;;
	cleanup)
		cleanup_entries
		;;
	help|--help|-h)
		cat <<'USAGE'
Usage: network-tweaks-sync <command>

Commands:
  sync      Synchronize DNS and hosts entries from enabled vhosts (default)
  status    Show current status and configuration
  cleanup   Remove all managed entries
  help      Show this help message

USAGE
		;;
	*)
		echo "Unknown command: $1" >&2
		echo "Run 'network-tweaks-sync help' for usage" >&2
		exit 1
		;;
esac