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

SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
KNOE_HOME=${KNOE_HOME:-$(cd "$SCRIPT_DIR/.." && pwd)}

CNPG_TEST_NAMESPACE=${CNPG_TEST_NAMESPACE:-knoe-cnpg-test}
CNPG_CLUSTER_NAME=${CNPG_CLUSTER_NAME:-knoe-db}
CNPG_OPERATOR_NAMESPACE=${CNPG_OPERATOR_NAMESPACE:-cnpg-system}
CNPG_CLUSTER_MANIFEST=${CNPG_CLUSTER_MANIFEST:-$KNOE_HOME/k8s/knoe/knoe-db.yaml}
CNPG_USER_SECRET_FILE=${CNPG_USER_SECRET_FILE:-$KNOE_HOME/knoe-db/knoe-db-user-secret.yaml}
CNPG_WAIT_TIMEOUT=${CNPG_WAIT_TIMEOUT:-300}
CNPG_FALLBACK_VERSION=${CNPG_FALLBACK_VERSION:-1.27.0}

SKIP_BUILD=${SKIP_BUILD:-false}
IMAGE_REPO=${IMAGE_REPO:-knoe-db}
IMAGE_LOAD=${IMAGE_LOAD:-}
IMAGE_LOAD_CMD=${IMAGE_LOAD_CMD:-}

log() {
  printf "[%s] %s\n" "$(date +%H:%M:%S)" "$*"
}

require_tool() {
  command -v "$1" >/dev/null 2>&1 || { echo "Missing required tool: $1" >&2; exit 1; }
}

get_latest_cnpg_version() {
  local version=""
  if command -v python3 >/dev/null 2>&1; then
    version=$(python3 - <<'PY'
import json,sys,urllib.request
try:
    with urllib.request.urlopen("https://api.github.com/repos/cloudnative-pg/cloudnative-pg/releases/latest", timeout=10) as resp:
        data=json.load(resp)
        tag=data.get("tag_name", "")
        print(tag.lstrip("v"))
except Exception:
    pass
PY
) || true
  fi

  if [[ -z "$version" ]]; then
    version=$(curl -fsSL "https://api.github.com/repos/cloudnative-pg/cloudnative-pg/releases/latest" 2>/dev/null \
      | sed -n 's/.*"tag_name": *"v\{0,1\}\([^"]*\)".*/\1/p' | head -n1) || true
  fi

  if [[ -z "$version" ]]; then
    echo "$CNPG_FALLBACK_VERSION"
  else
    echo "$version"
  fi
}

resolve_cnpg_manifest_url() {
  if [[ -n "${CNPG_MANIFEST_URL:-}" ]]; then
    echo "$CNPG_MANIFEST_URL"
    return 0
  fi

  local version
  version=${CNPG_VERSION:-$(get_latest_cnpg_version)}
  local minor
  minor=$(echo "$version" | awk -F. '{print $1"."$2}')
  echo "https://raw.githubusercontent.com/cloudnative-pg/cloudnative-pg/release-${minor}/releases/cnpg-${version}.yaml"
}

compute_image_tag() {
  local pg_version release
  pg_version=$(tr -d '[:space:]' < "$KNOE_HOME/conf/postgresql/.version" 2>/dev/null || true)
  release=$(tr -d '[:space:]' < "$KNOE_HOME/knoe-db/.version" 2>/dev/null || true)

  if [[ -z "$pg_version" ]]; then
    pg_version="17.7"
  fi

  if [[ -z "$release" ]]; then
    release="000"
  fi

  if [[ "$release" =~ ^[0-9]+$ ]]; then
    release=$(printf "%03d" "$release")
  fi

  echo "${pg_version}-${release}"
}

ensure_namespace() {
  if ! kubectl get namespace "$CNPG_TEST_NAMESPACE" >/dev/null 2>&1; then
    log "Creating namespace $CNPG_TEST_NAMESPACE"
    kubectl create namespace "$CNPG_TEST_NAMESPACE" >/dev/null
  fi
}

ensure_cnpg_operator() {
  if kubectl get crd clusters.postgresql.cnpg.io >/dev/null 2>&1; then
    log "CNPG CRDs detected; operator install skipped."
    return 0
  fi

  local url
  url=$(resolve_cnpg_manifest_url)
  log "Installing CloudNative-PG operator from: $url"
  kubectl apply --server-side -f "$url"

  if kubectl -n "$CNPG_OPERATOR_NAMESPACE" get deploy cnpg-controller-manager >/dev/null 2>&1; then
    kubectl -n "$CNPG_OPERATOR_NAMESPACE" rollout status deploy/cnpg-controller-manager --timeout=120s || true
  fi
}

build_image() {
  local image_tag
  image_tag=$(compute_image_tag)
  IMAGE="${IMAGE_REPO}:${image_tag}"

  if [[ "$SKIP_BUILD" == "true" ]]; then
    log "Skipping docker build (SKIP_BUILD=true)."
    return 0
  fi

  log "Building image $IMAGE"
  docker build -t "$IMAGE" "$KNOE_HOME/knoe-db"
}

load_image_if_requested() {
  if [[ -n "$IMAGE_LOAD_CMD" ]]; then
    log "Loading image with custom command: $IMAGE_LOAD_CMD"
    eval "$IMAGE_LOAD_CMD"
    return 0
  fi

  case "$IMAGE_LOAD" in
    kind)
      require_tool kind
      log "Loading image into kind: $IMAGE"
      kind load docker-image "$IMAGE"
      ;;
    minikube)
      require_tool minikube
      log "Loading image into minikube: $IMAGE"
      minikube image load "$IMAGE"
      ;;
    k3d)
      require_tool k3d
      log "Importing image into k3d: $IMAGE"
      if [[ -n "${K3D_CLUSTER_NAME:-}" ]]; then
        k3d image import "$IMAGE" -c "$K3D_CLUSTER_NAME"
      else
        k3d image import "$IMAGE"
      fi
      ;;
    "")
      ;;
    *)
      echo "Unknown IMAGE_LOAD value: $IMAGE_LOAD" >&2
      exit 2
      ;;
  esac
}

render_cluster_manifest() {
  local out_file=$1

  if [[ ! -f "$CNPG_CLUSTER_MANIFEST" ]]; then
    echo "Cluster manifest not found: $CNPG_CLUSTER_MANIFEST" >&2
    exit 1
  fi

  awk -v image="$IMAGE" '
    BEGIN { IGNORECASE=1 }
    /^  imageName:/ { print "  imageName: " image; next }
    /^  instances:/ { print "  instances: 3"; next }
    /postgis_tiger_geocoder/ { next }
    /schema tiger/ { next }
    { print }
  ' "$CNPG_CLUSTER_MANIFEST" > "$out_file"
}

collect_error_pod_logs() {
  local out_dir=$1
  local pods

  pods=$(kubectl -n "$CNPG_TEST_NAMESPACE" get pods -l "cnpg.io/cluster=$CNPG_CLUSTER_NAME" --no-headers 2>/dev/null \
    | awk '$3 ~ /(Error|CrashLoopBackOff|Init:Error|Init:CrashLoopBackOff)/ {print $1}')

  if [[ -z "$pods" ]]; then
    log "No error pods detected."
    return 0
  fi

  mkdir -p "$out_dir"
  for pod in $pods; do
    kubectl -n "$CNPG_TEST_NAMESPACE" describe pod "$pod" > "$out_dir/${pod}.describe" 2>&1 || true
    kubectl -n "$CNPG_TEST_NAMESPACE" logs "$pod" --all-containers --prefix=true --timestamps=true > "$out_dir/${pod}.log" 2>&1 || true
    kubectl -n "$CNPG_TEST_NAMESPACE" logs "$pod" --all-containers --prefix=true --timestamps=true --previous > "$out_dir/${pod}.previous.log" 2>&1 || true
  done
  log "Error pod logs written to $out_dir"
}

wait_for_primary_ready() {
  log "Waiting for CNPG primary pod to be Ready (timeout ${CNPG_WAIT_TIMEOUT}s)..."
  local deadline
  deadline=$(( $(date +%s) + CNPG_WAIT_TIMEOUT ))

  while [[ $(date +%s) -lt $deadline ]]; do
    if kubectl -n "$CNPG_TEST_NAMESPACE" get pods \
      -l "cnpg.io/cluster=$CNPG_CLUSTER_NAME,cnpg.io/instanceRole=primary" \
      --no-headers 2>/dev/null | grep -q .; then
      if kubectl -n "$CNPG_TEST_NAMESPACE" wait --for=condition=Ready pod \
        -l "cnpg.io/cluster=$CNPG_CLUSTER_NAME,cnpg.io/instanceRole=primary" \
        --timeout=30s; then
        return 0
      fi
    fi
    sleep 5
  done

  return 1
}

main() {
  require_tool kubectl
  require_tool docker

  build_image
  load_image_if_requested

  ensure_namespace
  ensure_cnpg_operator

  if [[ -f "$CNPG_USER_SECRET_FILE" ]]; then
    log "Applying CNPG user secret: $CNPG_USER_SECRET_FILE"
    kubectl -n "$CNPG_TEST_NAMESPACE" apply -f "$CNPG_USER_SECRET_FILE"
  else
    log "Skipping CNPG user secret (file not found): $CNPG_USER_SECRET_FILE"
  fi

  local tmp_dir
  tmp_dir=$(mktemp -d)
  local rendered_manifest="$tmp_dir/cluster.yaml"
  render_cluster_manifest "$rendered_manifest"

  log "Applying CNPG cluster manifest: $rendered_manifest"
  kubectl -n "$CNPG_TEST_NAMESPACE" apply -f "$rendered_manifest"

  if ! wait_for_primary_ready; then
    local log_dir
    local base_log_dir
    base_log_dir="${PROLE_LOGS:-$KNOE_HOME/logs}"
    base_log_dir="${base_log_dir%/}"
    log_dir=${CNPG_TEST_LOG_DIR:-$base_log_dir/cnpg-test-$(date +%Y%m%dT%H%M%S)}
    collect_error_pod_logs "$log_dir"
    kubectl -n "$CNPG_TEST_NAMESPACE" get pods -l "cnpg.io/cluster=$CNPG_CLUSTER_NAME" || true
    echo "CNPG primary pod did not become Ready within timeout." >&2
    exit 1
  fi

  kubectl -n "$CNPG_TEST_NAMESPACE" get pods -l "cnpg.io/cluster=$CNPG_CLUSTER_NAME" || true
  log "CNPG test completed successfully."
}

main "$@"