#!/usr/bin/env bash
# Starts a primary (:3000) and a replica (:3001), writes a few records to the
# primary and checks that they show up on the replica.
# Run from the project root:  bash repl-test.sh
# Override the binary with:    BIN=/path/to/rust_test bash repl-test.sh
set -euo pipefail

BIN="${BIN:-$(pwd)/target/debug/rust_test}"
WORK="${WORK:-$(pwd)/repl-test}"
TOKEN="${TOKEN:-dev-secret-token}"
PRIMARY_PORT=3000
REPLICA_PORT=3001

[[ -x "$BIN" ]] || { echo "Binary not found or not executable: $BIN" >&2; exit 1; }

# Each instance gets its own directory: messages.db is opened relative to cwd.
rm -rf "$WORK"
mkdir -p "$WORK/primary" "$WORK/replica"

for d in primary replica; do
  cat > "$WORK/$d/config.json" <<'EOF'
{
  "mode": "loose",
  "fields": {
    "msg": { "type": "string" }
  }
}
EOF
done

PIDS=()
cleanup() {
  trap - EXIT INT TERM
  echo
  echo "Stopping instances..."
  for pid in "${PIDS[@]}"; do kill "$pid" 2>/dev/null || true; done
  wait 2>/dev/null || true
}
trap cleanup EXIT INT TERM

start() { # name port extra-env...
  local name=$1 port=$2
  shift 2
  ( cd "$WORK/$name" && exec env \
      APP_CONFIG=config.json \
      APP_BIND="127.0.0.1:$port" \
      APP_REPL_TOKEN="$TOKEN" \
      APP_SYNC_INTERVAL_SECS=1 \
      "$@" "$BIN" ) >"$WORK/$name/log.txt" 2>&1 &
  PIDS+=("$!")
}

wait_up() { # port
  for _ in $(seq 1 50); do
    curl -sf "http://127.0.0.1:$1/api/now" >/dev/null 2>&1 && return 0
    sleep 0.1
  done
  echo "Instance on port $1 did not come up; see logs in $WORK" >&2
  exit 1
}

echo "Starting primary on :$PRIMARY_PORT"
start primary "$PRIMARY_PORT" APP_ROLE=primary
wait_up "$PRIMARY_PORT"

echo "Starting replica on :$REPLICA_PORT"
start replica "$REPLICA_PORT" \
  APP_ROLE=replica \
  APP_PRIMARY_URL="http://127.0.0.1:$PRIMARY_PORT"
wait_up "$REPLICA_PORT"

echo
echo "Writing 3 records to the primary"
for i in 1 2 3; do
  curl -s -X POST "http://127.0.0.1:$PRIMARY_PORT/api/records" \
    -H 'Content-Type: application/json' \
    -d "{\"data\":{\"msg\":\"hello $i\"}}"
  echo
done

echo
echo "Waiting for the replica to catch up..."
caught_up=0
for _ in $(seq 1 30); do
  if curl -s "http://127.0.0.1:$REPLICA_PORT/api/replication/status" \
       | grep -q '"last_applied_seq":3'; then
    caught_up=1
    break
  fi
  sleep 0.5
done

echo
echo "Replica status:"
curl -s "http://127.0.0.1:$REPLICA_PORT/api/replication/status"
echo
echo
echo "Replica records:"
curl -s "http://127.0.0.1:$REPLICA_PORT/api/records"
echo
echo
echo "Write to the replica (should be rejected):"
curl -s -w ' [HTTP %{http_code}]\n' -X POST "http://127.0.0.1:$REPLICA_PORT/api/records" \
  -H 'Content-Type: application/json' \
  -d '{"data":{"msg":"nope"}}'

echo
if [[ $caught_up -eq 1 ]]; then
  echo "OK: replica caught up."
else
  echo "WARNING: replica did not reach seq 3 in time; check $WORK/replica/log.txt"
fi

cat <<EOF

Both instances are still running. Try:
  curl -s -X POST http://127.0.0.1:$PRIMARY_PORT/api/records -H 'Content-Type: application/json' -d '{"data":{"msg":"more"}}'
  curl -s http://127.0.0.1:$REPLICA_PORT/api/replication/status
Logs: $WORK/primary/log.txt and $WORK/replica/log.txt
To test lazy sync: kill the primary (PID ${PIDS[0]}), write nothing, restart it by hand
from $WORK/primary with the same env, and watch the replica recover.
Ctrl-C to stop both.
EOF

wait