import * as v38Types from '../compose-spec/v3.8';
import { IServiceDefinition, ServiceHealthCheck, DeploymentConfiguration, ContainerConfig, TaskConfig } from './types';
import Container from './container';

// ALB Healthcheck, should be overriden by CLI command
const DEFAULT_API_HEALTHCHECK = {
  path: '/',
  port: 443,
};

/* This will ensure that there is always at least 1 task running during deployment
 */
const DEFAULT_SERVICE_DEPLYMENT_CONFIG = {
  MaximumPercent: 200,
  MinimumHealthyPercent: 100,
};
const DEFAULT_DESIRED_COUNT = 1; // Should this be 3?

const DEFAULT_TASK_MEMORY_CPU = {
  memory: 1, // In GB: .5, 1, 2, ...6
  vCPU: 1, // 0.25, .5, 1, 2, ...4
};

const DEFAULT_CONTAINER_MEMORY_MAX = 1024;
const DEFAULT_CPU_UNIT_RESERVATION = DEFAULT_CONTAINER_MEMORY_MAX * 0.1; // Do we even need this?
const DEFAULT_CONTAINER_MEMORY_CPU = {
  memory: DEFAULT_CONTAINER_MEMORY_MAX,
  cpu: DEFAULT_CPU_UNIT_RESERVATION,
};

class Service implements IServiceDefinition {
  containers: Container[] = [];

  apiHealthcheck?: ServiceHealthCheck;

  taskResources: TaskConfig = DEFAULT_TASK_MEMORY_CPU;

  containerResources: ContainerConfig = DEFAULT_CONTAINER_MEMORY_CPU;

  deploymentConfiguration: DeploymentConfiguration = DEFAULT_SERVICE_DEPLYMENT_CONFIG;

  desiredCount: number = DEFAULT_DESIRED_COUNT;

  constructor(
    containers: Container[],
    apiHealthcheck: ServiceHealthCheck = DEFAULT_API_HEALTHCHECK,
    dockerDeploymentConfig?: v38Types.DefinitionsDeployment2,
  ) {
    containers.forEach((instance) => {
      this.containers.push(instance);
    });

    this.apiHealthcheck = apiHealthcheck; // Potentially exposed via CLI inputs, not Docker Compose

    // Docker compose optional inputs//

    /* SERVICE-specific settings*/
    dockerDeploymentConfig?.replicas !== undefined && (this.desiredCount = dockerDeploymentConfig?.replicas); // Main control, replica ~= task count

    dockerDeploymentConfig?.placement?.max_replicas_per_node !== undefined &&
      (this.deploymentConfiguration.MaximumPercent = dockerDeploymentConfig?.placement?.max_replicas_per_node);

    /* CONTAINER-specific settings*/
    // ECS recommends 300-500 MiB as a starting point for web applications.
    dockerDeploymentConfig?.resources?.limits?.memory !== undefined &&
      (this.containerResources.memory = dockerDeploymentConfig?.resources?.limits?.memory.slice(0, -1) as unknown as number);

    // Note: when you don’t specify any CPU units for a container
    // ECS intrinsically enforces two Linux CPU shares for the cgroup (which is the minimum allowed).
    dockerDeploymentConfig?.resources?.limits?.cpus !== undefined &&
      (this.containerResources.cpu = dockerDeploymentConfig?.resources?.reservations?.cpus as number);
  }
}

export default Service;