#!/bin/sh
# P2P Package Catalog Sync API
# Aggregates package catalogs from all mesh peers

echo "Content-Type: application/json"
echo "Access-Control-Allow-Origin: *"
echo "Access-Control-Allow-Methods: GET, POST, OPTIONS"
echo ""

# Handle CORS preflight
if [ "$REQUEST_METHOD" = "OPTIONS" ]; then
	exit 0
fi

# Load P2P feed library
. /usr/lib/secubox/p2p-feed.sh 2>/dev/null

# Parse query string
parse_query() {
	local query="$QUERY_STRING"
	local key value

	PEER_FILTER=""
	REFRESH=""

	while [ -n "$query" ]; do
		key="${query%%=*}"
		query="${query#*=}"
		value="${query%%&*}"
		query="${query#*&}"
		[ "$query" = "$value" ] && query=""

		case "$key" in
			peer) PEER_FILTER="$value" ;;
			refresh) REFRESH="$value" ;;
		esac
	done
}

parse_query

# Invalidate cache if refresh requested
if [ "$REFRESH" = "1" ]; then
	invalidate_peer_cache
fi

# Get node info
NODE_ID=$(get_local_node_id)
NODE_NAME=$(get_local_node_name)
UPDATED=$(date -Iseconds 2>/dev/null || date '+%Y-%m-%dT%H:%M:%S')

# Start JSON output
echo '{'
echo "\"node_id\":\"$NODE_ID\","
echo "\"node_name\":\"$NODE_NAME\","
echo "\"updated\":\"$UPDATED\","

# Sync stats
PEERS_SYNCED=0
PEERS_FAILED=0
TOTAL_PACKAGES=0

echo '"sources":['

FIRST_SOURCE=1

# Include local packages
if feed_exists; then
	LOCAL_COUNT=$(get_package_count)
	TOTAL_PACKAGES=$LOCAL_COUNT

	echo '{'
	echo "\"node_id\":\"$NODE_ID\","
	echo "\"node_name\":\"$NODE_NAME\","
	echo "\"type\":\"local\","
	echo "\"address\":\"local\","
	echo "\"status\":\"ok\","
	echo "\"feed_hash\":\"$(get_feed_hash)\","
	echo "\"package_count\":$LOCAL_COUNT,"
	echo "\"packages\":$(packages_to_json)"
	echo '}'
	FIRST_SOURCE=0
fi

# Sync from peers
PEERS_FILE="/tmp/secubox-p2p-peers.json"
if [ -f "$PEERS_FILE" ]; then
	PEER_COUNT=$(jsonfilter -i "$PEERS_FILE" -e '@.peers[*]' 2>/dev/null | wc -l)
	I=0

	while [ $I -lt $PEER_COUNT ]; do
		IS_LOCAL=$(jsonfilter -i "$PEERS_FILE" -e "@.peers[$I].is_local" 2>/dev/null)
		[ "$IS_LOCAL" = "true" ] && { I=$((I + 1)); continue; }

		PEER_ADDR=$(jsonfilter -i "$PEERS_FILE" -e "@.peers[$I].address" 2>/dev/null)
		PEER_NAME=$(jsonfilter -i "$PEERS_FILE" -e "@.peers[$I].name" 2>/dev/null)
		PEER_WG=$(jsonfilter -i "$PEERS_FILE" -e "@.peers[$I].wg_addresses" 2>/dev/null | cut -d',' -f1)

		# Prefer WireGuard address
		USE_ADDR="$PEER_ADDR"
		[ -n "$PEER_WG" ] && USE_ADDR="$PEER_WG"

		# Skip if filtering for specific peer
		if [ -n "$PEER_FILTER" ] && [ "$USE_ADDR" != "$PEER_FILTER" ] && [ "$PEER_NAME" != "$PEER_FILTER" ]; then
			I=$((I + 1))
			continue
		fi

		[ -n "$USE_ADDR" ] || { I=$((I + 1)); continue; }

		# Fetch peer's package catalog
		PEER_CATALOG=$(curl -s --connect-timeout 5 --max-time 30 \
			"http://${USE_ADDR}:7331/api/factory/packages" 2>/dev/null)

		[ $FIRST_SOURCE -eq 0 ] && echo ','
		FIRST_SOURCE=0

		if [ -n "$PEER_CATALOG" ]; then
			PEER_HASH=$(echo "$PEER_CATALOG" | jsonfilter -e '@.feed_hash' 2>/dev/null)
			PEER_PKG_COUNT=$(echo "$PEER_CATALOG" | jsonfilter -e '@.package_count' 2>/dev/null)
			PEER_PACKAGES=$(echo "$PEER_CATALOG" | jsonfilter -e '@.packages' 2>/dev/null)

			if [ -n "$PEER_HASH" ]; then
				PEERS_SYNCED=$((PEERS_SYNCED + 1))
				TOTAL_PACKAGES=$((TOTAL_PACKAGES + ${PEER_PKG_COUNT:-0}))

				echo '{'
				echo "\"node_id\":\"$USE_ADDR\","
				echo "\"node_name\":\"$PEER_NAME\","
				echo "\"type\":\"peer\","
				echo "\"address\":\"$USE_ADDR\","
				echo "\"status\":\"ok\","
				echo "\"feed_hash\":\"$PEER_HASH\","
				echo "\"package_count\":${PEER_PKG_COUNT:-0},"
				echo "\"packages\":${PEER_PACKAGES:-[]}"
				echo '}'
			else
				PEERS_FAILED=$((PEERS_FAILED + 1))
				echo '{'
				echo "\"node_id\":\"$USE_ADDR\","
				echo "\"node_name\":\"$PEER_NAME\","
				echo "\"type\":\"peer\","
				echo "\"address\":\"$USE_ADDR\","
				echo "\"status\":\"error\","
				echo "\"error\":\"invalid_response\""
				echo '}'
			fi
		else
			PEERS_FAILED=$((PEERS_FAILED + 1))
			echo '{'
			echo "\"node_id\":\"$USE_ADDR\","
			echo "\"node_name\":\"$PEER_NAME\","
			echo "\"type\":\"peer\","
			echo "\"address\":\"$USE_ADDR\","
			echo "\"status\":\"unreachable\","
			echo "\"error\":\"connection_failed\""
			echo '}'
		fi

		I=$((I + 1))
	done
fi

echo '],'

# Summary stats
echo "\"sync_stats\":{"
echo "\"peers_synced\":$PEERS_SYNCED,"
echo "\"peers_failed\":$PEERS_FAILED,"
echo "\"total_packages\":$TOTAL_PACKAGES"
echo '}'

echo '}'