#!/usr/bin/env bash
set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
HTTP_HELPER="${ROOT_DIR}/build/amduatd_http_unix"
USE_HTTP_HELPER=0
TMPDIR="${TMPDIR:-/tmp}"
mkdir -p "${TMPDIR}"

if ! command -v grep >/dev/null 2>&1; then
  echo "skip: grep not found" >&2
  exit 77
fi
if ! command -v awk >/dev/null 2>&1; then
  echo "skip: awk not found" >&2
  exit 77
fi
if command -v curl >/dev/null 2>&1; then
  if curl --help 2>/dev/null | grep -q -- '--unix-socket'; then
    USE_HTTP_HELPER=0
  else
    USE_HTTP_HELPER=1
  fi
else
  USE_HTTP_HELPER=1
fi
if [[ "${USE_HTTP_HELPER}" -eq 1 && ! -x "${HTTP_HELPER}" ]]; then
  echo "skip: curl lacks --unix-socket support and helper missing" >&2
  exit 77
fi

AMDUATD_BIN="${ROOT_DIR}/build/amduatd"
ASL_BIN="${ROOT_DIR}/vendor/amduat/build/amduat-asl"

if [[ ! -x "${AMDUATD_BIN}" || ! -x "${ASL_BIN}" ]]; then
  echo "missing binaries; build amduatd and amduat-asl first" >&2
  exit 1
fi

tmp_root="$(mktemp -d -p "${TMPDIR}" amduatd-fed-smoke-XXXXXX)"
root_a="${tmp_root}/a"
root_b="${tmp_root}/b"
sock_a="${tmp_root}/amduatd-a.sock"
sock_b="${tmp_root}/amduatd-b.sock"
space_id="smoke"
log_a="${tmp_root}/amduatd-a.log"
log_b="${tmp_root}/amduatd-b.log"

cleanup() {
  if [[ -n "${pid_a:-}" ]]; then
    kill "${pid_a}" >/dev/null 2>&1 || true
  fi
  if [[ -n "${pid_b:-}" ]]; then
    kill "${pid_b}" >/dev/null 2>&1 || true
  fi
  rm -rf "${tmp_root}"
}
trap cleanup EXIT

mkdir -p "${root_a}" "${root_b}"

"${ASL_BIN}" init --root "${root_a}"
"${ASL_BIN}" init --root "${root_b}"

"${AMDUATD_BIN}" --root "${root_a}" --sock "${sock_a}" \
  --store-backend index --space "${space_id}" \
  --fed-enable --fed-transport unix \
  --fed-unix-sock "${sock_b}" --fed-domain-id 1 \
  >"${log_a}" 2>&1 &
pid_a=$!

"${AMDUATD_BIN}" --root "${root_b}" --sock "${sock_b}" \
  --store-backend index --space "${space_id}" \
  --fed-enable --fed-transport unix \
  --fed-unix-sock "${sock_a}" --fed-domain-id 2 \
  >"${log_b}" 2>&1 &
pid_b=$!

http_get() {
  local sock="$1"
  local path="$2"
  shift 2
  if [[ "${USE_HTTP_HELPER}" -eq 1 ]]; then
    "${HTTP_HELPER}" --sock "${sock}" --method GET --path "${path}" "$@"
  else
    curl --silent --show-error --fail \
      --unix-socket "${sock}" \
      "$@" \
      "http://localhost${path}"
  fi
}

http_get_allow() {
  local sock="$1"
  local path="$2"
  shift 2
  if [[ "${USE_HTTP_HELPER}" -eq 1 ]]; then
    "${HTTP_HELPER}" --sock "${sock}" --method GET --path "${path}" \
      --allow-status "$@"
  else
    curl --silent --show-error \
      --unix-socket "${sock}" \
      "$@" \
      "http://localhost${path}"
  fi
}

http_post() {
  local sock="$1"
  local path="$2"
  local data="$3"
  shift 3
  if [[ "${USE_HTTP_HELPER}" -eq 1 ]]; then
    "${HTTP_HELPER}" --sock "${sock}" --method POST --path "${path}" \
      --data "${data}" \
      "$@"
  else
    curl --silent --show-error --fail \
      --unix-socket "${sock}" \
      "$@" \
      --data-binary "${data}" \
      "http://localhost${path}"
  fi
}

wait_for_ready() {
  local sock="$1"
  local pid="$2"
  local log_path="$3"
  local i
  for i in $(seq 1 100); do
    if ! kill -0 "${pid}" >/dev/null 2>&1; then
      if [[ -f "${log_path}" ]] && grep -q "bind: Operation not permitted" "${log_path}"; then
        echo "skip: bind not permitted for unix socket" >&2
        exit 77
      fi
      if [[ -f "${log_path}" ]]; then
        cat "${log_path}" >&2
      fi
      return 1
    fi
    if [[ -S "${sock}" ]]; then
      if http_get "${sock}" "/v1/meta" >/dev/null 2>&1; then
        return 0
      fi
    fi
    sleep 0.1
  done
  return 1
}

if ! wait_for_ready "${sock_a}" "${pid_a}" "${log_a}"; then
  echo "daemon A not ready" >&2
  exit 1
fi
if ! wait_for_ready "${sock_b}" "${pid_b}" "${log_b}"; then
  echo "daemon B not ready" >&2
  exit 1
fi

payload="fed-smoke"
artifact_resp="$(
  http_post "${sock_a}" "/v1/artifacts" "${payload}" \
    --header "Content-Type: application/octet-stream" \
    --header "X-Amduat-Space: ${space_id}"
)" || {
  echo "artifact POST failed" >&2
  if [[ -f "${log_a}" ]]; then
    cat "${log_a}" >&2
  fi
  exit 1
}
ref="$(
  printf '%s' "${artifact_resp}" \
    | tr -d '\r\n' \
    | awk 'match($0, /"ref":"[^"]+"/) {print substr($0, RSTART+7, RLENGTH-8)}'
)"

if [[ -z "${ref}" ]]; then
  echo "failed to parse ref from daemon A" >&2
  echo "artifact response: ${artifact_resp}" >&2
  if [[ -f "${log_a}" ]]; then
    cat "${log_a}" >&2
  fi
  exit 1
fi

plan_resp="$(
  http_get_allow "${sock_b}" "/v1/fed/pull/plan?peer=1&limit=8" \
    --header "X-Amduat-Space: ${space_id}"
)" || {
  echo "pull plan failed" >&2
  if [[ -f "${log_b}" ]]; then
    cat "${log_b}" >&2
  fi
  exit 1
}
if echo "${plan_resp}" | grep -q "\"record_count\":0"; then
  echo "pull plan empty" >&2
  echo "plan response: ${plan_resp}" >&2
  exit 1
fi

pull_resp="$(
  http_post "${sock_b}" "/v1/fed/pull?peer=1&limit=8" "" \
    --header "X-Amduat-Space: ${space_id}"
)" || {
  echo "pull apply failed" >&2
  if [[ -f "${log_b}" ]]; then
    cat "${log_b}" >&2
  fi
  exit 1
}
if ! echo "${pull_resp}" | grep -q "\"advanced\":true"; then
  echo "pull did not advance cursor" >&2
  echo "pull response: ${pull_resp}" >&2
  exit 1
fi

cursor_json="$(
  http_get_allow "${sock_b}" "/v1/fed/cursor?peer=1" \
    --header "X-Amduat-Space: ${space_id}"
)" || {
  echo "cursor fetch failed" >&2
  if [[ -f "${log_a}" ]]; then
    cat "${log_a}" >&2
  fi
  if [[ -f "${log_b}" ]]; then
    cat "${log_b}" >&2
  fi
  exit 1
}

echo "${cursor_json}" | grep -q "\"last_logseq\":" || {
  echo "cursor missing last_logseq" >&2
  echo "cursor response: ${cursor_json}" >&2
  exit 1
}

payload_b="$(
  http_get "${sock_b}" "/v1/artifacts/${ref}" \
    --header "X-Amduat-Space: ${space_id}"
)" || {
  echo "artifact fetch failed" >&2
  if [[ -f "${log_b}" ]]; then
    cat "${log_b}" >&2
  fi
  exit 1
}

if [[ "${payload_b}" != "${payload}" ]]; then
  echo "payload mismatch after pull" >&2
  exit 1
fi

echo "fed smoke ok"