#!/usr/bin/env bash
# Check explorer indexer lag; if above threshold, run fix-explorer-indexer-lag.sh (restart Blockscout).
# For use from cron. Run from project root. Requires LAN/SSH to r630-02 for the fix.
# Usage: bash scripts/maintenance/check-and-fix-explorer-lag.sh
# Env: EXPLORER_INDEXER_LAG_THRESHOLD (default 500)

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
source "${PROJECT_ROOT}/config/ip-addresses.conf" 2>/dev/null || true

IP_RPC_2201="${RPC_2201:-192.168.11.221}"
IP_BLOCKSCOUT="${IP_BLOCKSCOUT:-192.168.11.140}"
BLOCKSCOUT_API_PORT="${BLOCKSCOUT_API_PORT:-4000}"
EXPLORER_INDEXER_LAG_THRESHOLD="${EXPLORER_INDEXER_LAG_THRESHOLD:-500}"

get_rpc_block() {
  local hex
  hex=$(curl -sf --max-time 10 -X POST -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' \
    "http://${IP_RPC_2201}:8545" 2>/dev/null | sed -n 's/.*"result":"\(0x[0-9a-fA-F]*\)".*/\1/p')
  [ -n "$hex" ] && echo $((hex)) || true
}

get_explorer_block() {
  local body block
  body=$(curl -sf --max-time 10 "http://${IP_BLOCKSCOUT}:${BLOCKSCOUT_API_PORT}/api/v2/stats" 2>/dev/null || true)
  [ -z "$body" ] && return
  block=$(echo "$body" | sed -n 's/.*"total_blocks"\s*:\s*"\([0-9]*\)".*/\1/p' | head -1)
  [ -z "$block" ] && block=$(echo "$body" | sed -n 's/.*"total_blocks"\s*:\s*\([0-9]*\).*/\1/p' | head -1)
  [ -n "$block" ] && echo "$block"
}

rpc_block=$(get_rpc_block)
explorer_block=$(get_explorer_block)

if [ -z "$rpc_block" ] || [ -z "$explorer_block" ]; then
  echo "$(date -Iseconds) SKIP (RPC or Blockscout unreachable)"
  exit 0
fi

lag=$((rpc_block - explorer_block))
if [ "$lag" -le "${EXPLORER_INDEXER_LAG_THRESHOLD}" ] 2>/dev/null; then
  echo "$(date -Iseconds) OK lag=$lag (threshold=${EXPLORER_INDEXER_LAG_THRESHOLD})"
  exit 0
fi

echo "$(date -Iseconds) LAG $lag > ${EXPLORER_INDEXER_LAG_THRESHOLD} — running fix"
bash "$PROJECT_ROOT/scripts/fix-explorer-indexer-lag.sh" 2>&1 || true