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

_REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../../../../.." && pwd)"
# shellcheck source=scripts/meta/env/load.sh
source "${_REPO_ROOT}/scripts/meta/env/load.sh"

if [ -s "${SWARM_DRILL_ENV:-}" ]; then
	set -a
	# shellcheck source=/dev/null
	source "${SWARM_DRILL_ENV}"
	set +a
fi

: "${APP_ID:?APP_ID required}"

ENTITY="$(PYTHONPATH="${_REPO_ROOT}" "${PYTHON}" -c "from utils.roles.entity.name import get_entity_name; print(get_entity_name('${APP_ID}'))")"

STACK_NAME="${ENTITY}"
CUSTOM_IMAGE_REPO="${ENTITY}_custom"

ROLE_DIR="${_REPO_ROOT}/roles/${APP_ID}"

PRIMARY_SERVICE_KEY="$(PYTHONPATH="${_REPO_ROOT}" "${PYTHON}" -c "
import os, yaml
key = '${ENTITY}'
svc = os.path.join('${ROLE_DIR}', 'meta', 'services.yml')
if os.path.exists(svc):
    data = yaml.safe_load(open(svc)) or {}
    entity = data.get('${ENTITY}') if isinstance(data, dict) else None
    if isinstance(entity, dict):
        k = (entity.get('proxy') or {}).get('service_key')
        if isinstance(k, str) and k:
            key = k
print(key)
")"
SERVICE_NAME="${STACK_NAME}_${PRIMARY_SERVICE_KEY}"

DB_DEP=none
if [ -f "${ROLE_DIR}/meta/services.yml" ]; then
	if grep -qE '^mariadb:' "${ROLE_DIR}/meta/services.yml"; then
		DB_DEP=mariadb
	elif grep -qE '^postgres:' "${ROLE_DIR}/meta/services.yml"; then
		DB_DEP=postgres
	fi
fi

DEFAULT_PLACEMENT_MANAGER=false
if [ -f "${ROLE_DIR}/meta/services.yml" ] &&
	grep -qE "placement:[[:space:]]*manager\b" "${ROLE_DIR}/meta/services.yml"; then
	DEFAULT_PLACEMENT_MANAGER=true
fi

PROBE_PORT="$(PYTHONPATH="${_REPO_ROOT}" "${PYTHON}" -c "
import os, yaml
port = 80
svc = os.path.join('${ROLE_DIR}', 'meta', 'services.yml')
if os.path.exists(svc):
    data = yaml.safe_load(open(svc)) or {}
    entity = data.get('${ENTITY}') if isinstance(data, dict) else None
    if isinstance(entity, dict):
        try:
            port = entity['ports']['internal']['http'] or 80
        except Exception:
            port = 80
print(port)
")"

NFS_VOLUMES=""
if [ -f "${ROLE_DIR}/meta/volumes.yml" ]; then
	NFS_VOLUMES="$(python3 -c "
import sys, yaml
with open('${ROLE_DIR}/meta/volumes.yml') as f:
    data = yaml.safe_load(f) or {}
if isinstance(data, list):
    entries = [e for e in data if isinstance(e, dict)]
elif isinstance(data, dict):
    entries = [v for v in data.values() if isinstance(v, dict)]
else:
    entries = []
for v in entries:
    if v.get('type') != 'volume':
        continue
    if v.get('nfs') is False:
        continue
    docker_name = v.get('docker_name') or v.get('name')
    if isinstance(docker_name, str):
        print(docker_name)
")"
fi

PRIMARY_NFS_VOLUME="${NFS_VOLUMES%%$'\n'*}"

NFS_CHECK_MOUNTPOINT="/mnt/nfs-check"

export APP_ID ENTITY STACK_NAME SERVICE_NAME PRIMARY_SERVICE_KEY CUSTOM_IMAGE_REPO DB_DEP NFS_VOLUMES PRIMARY_NFS_VOLUME DEFAULT_PLACEMENT_MANAGER PROBE_PORT NFS_CHECK_MOUNTPOINT

# Exits the calling chaos step (09/10/11) with success when the role is
# manager-pinned (no worker task exists to drain).
skip_chaos_if_manager_pinned() {
	if [ "${DEFAULT_PLACEMENT_MANAGER}" = true ]; then
		echo "SKIP: ${ENTITY} declares placement: manager (single-node on the swarm manager) — drain-a-worker reschedule chaos does not apply"
		exit 0
	fi
}

has_swarm_service() {
	local _names=""
	[ -n "${MGR:-}" ] || return 1
	if ! _names="$(docker exec "${MGR}" docker stack services \
		--format '{{.Name}}' "${STACK_NAME}" 2>/dev/null)"; then
		_names=""
	fi
	printf '%s\n' "${_names}" | grep -qxF "${SERVICE_NAME}"
}

# Prints the swarm service carrying APP_ID's database. A role that pins its own
# engine runs it as <entity>_database inside its own stack, a central provider
# as <dep>_<dep> in its own (plugins/lookup/database.py).
resolve_db_service() {
	local _names=""
	[ "${DB_DEP}" != "none" ] || return 0
	[ -n "${MGR:-}" ] || return 0
	if ! _names="$(timeout 30 docker exec "${MGR}" docker service ls --format '{{.Name}}' 2>/dev/null)"; then
		return 0
	fi
	if printf '%s\n' "${_names}" | grep -qxF "${STACK_NAME}_database"; then
		printf '%s\n' "${STACK_NAME}_database"
	elif printf '%s\n' "${_names}" | grep -qxF "${DB_DEP}_${DB_DEP}"; then
		printf '%s\n' "${DB_DEP}_${DB_DEP}"
	fi
}

# Exits the calling gate (03/05/06/07) with success when the role deploys no
# swarm service to converge or drain.
skip_if_no_swarm_service() {
	if ! has_swarm_service; then
		echo "SKIP: ${ENTITY} (${APP_ID}) deployed no swarm service — converge/chaos gate does not apply"
		exit 0
	fi
}

# A stack whose sidecar is named after its app (<app>mcp) makes every
# `--filter name=<app>` a two-hit match, so both helpers below match exactly.
# Param: $1 node container, $2 swarm service name
service_container_id() {
	docker exec "$1" docker ps \
		--filter "label=com.docker.swarm.service.name=$2" \
		--format '{{.ID}}' | head -1
}

# Param: $1 manager container, $2 swarm service name
service_replicas() {
	docker exec "$1" docker service ls \
		--filter "name=$2" --format '{{.Name}} {{.Replicas}}' |
		awk -v svc="$2" '$1 == svc { print $2 }'
}

# Param: $1 node container, $2 app container id, $3 port
probe_app_reachable() {
	docker exec "$1" docker exec "$2" sh -c \
		"curl -sS http://localhost:$3/ || wget -qO- http://localhost:$3/ || nc -z localhost $3" >/dev/null 2>&1 ||
		docker exec "$1" docker exec "$2" bash -c "exec 3<>/dev/tcp/localhost/$3" >/dev/null 2>&1 ||
		docker exec "$1" sh -c "docker inspect -f '{{.State.Health.Status}}' $2 | grep -qx healthy" >/dev/null 2>&1
}

if [ "${SWARM_NFS_PILOT_VERBOSE:-0}" = "1" ]; then
	echo "==> APP_ID=${APP_ID}"
	echo "    ENTITY=${ENTITY}"
	echo "    STACK_NAME=${STACK_NAME}"
	echo "    SERVICE_NAME=${SERVICE_NAME}"
	echo "    CUSTOM_IMAGE_REPO=${CUSTOM_IMAGE_REPO}"
	echo "    DB_DEP=${DB_DEP}"
	echo "    PRIMARY_NFS_VOLUME=${PRIMARY_NFS_VOLUME}"
	echo "    DEFAULT_PLACEMENT_MANAGER=${DEFAULT_PLACEMENT_MANAGER}"
	echo "    PROBE_PORT=${PROBE_PORT}"
fi