/**
 * compose.ts — Gerador de Docker Compose xCloud-ready
 * Scenario A: build-source (1 app + opcional db)
 * Scenario C: multi-service (vários apps + nginx-router)
 */
import type { DockerCompose } from './types';

const GHCR = (owner: string, repo: string) => `ghcr.io/${owner}/${repo}`;
const DB = { postgres: 'postgres:16-alpine', mysql: 'mysql:8.0' };

/** Scenario A */
export function scenarioA(opts: {
  owner: string; repo: string; service: string; port: number;
  dbType: 'postgres' | 'mysql' | 'none'; env: Record<string, string>;
}): DockerCompose {
  const img = `${GHCR(opts.owner, opts.repo)}:latest`;
  const svcs: Record<string, any> = {
    app: { image: img, ports: [`${opts.port}:3000`], environment: opts.env, networks: ['app-net'] },
  };

  if (opts.dbType !== 'none') {
    const isPg = opts.dbType === 'postgres';
    svcs['db'] = {
      image: DB[opts.dbType],
      expose: [isPg ? '5432' : '3306'],
      environment: isPg
        ? { POSTGRES_DB: '${POSTGRES_DB}', POSTGRES_USER: '${POSTGRES_USER}', POSTGRES_PASSWORD: '${POSTGRES_PASSWORD}' }
        : { MYSQL_ROOT_PASSWORD: '${DB_PASSWORD}', MYSQL_DATABASE: '${DB_DATABASE}', MYSQL_USER: '${DB_USERNAME}', MYSQL_PASSWORD: '${DB_PASSWORD}' },
      volumes: ['db-data:/var/lib/postgresql/data'],
      healthcheck: { test: isPg ? ['CMD-SHELL','pg_isready -U ${POSTGRES_USER}'] : ['CMD','mysqladmin','ping','-h','localhost'], interval: '10s', timeout: '5s', retries: 5 },
      networks: ['app-net'],
    };
    svcs['app'].depends_on = [{ service: 'db', condition: 'service_healthy' }];
  }

  return { services: svcs, ...(opts.dbType !== 'none' ? { volumes: { 'db-data': {} } } : {}), networks: { 'app-net': { driver: 'bridge' } } };
}

/** Scenario C — multi-service com nginx-router */
export function scenarioC(opts: {
  owner: string; repo: string;
  services: Array<{ name: string; port: number; internalPort: number }>;
  dbType: 'postgres' | 'mysql' | 'none';
  envs: Record<string, Record<string, string>>;
}): DockerCompose {
  const svcs: Record<string, any> = {};
  const base = GHCR(opts.owner, opts.repo);

  for (const s of opts.services) {
    svcs[s.name] = { image: `${base}/${s.name}:latest`, expose: [String(s.internalPort)], environment: opts.envs[s.name] || {}, networks: ['app-net'] };
  }
  if (opts.dbType !== 'none') {
    const isPg = opts.dbType === 'postgres';
    svcs['db'] = {
      image: DB[opts.dbType], expose: [isPg ? '5432' : '3306'],
      environment: { POSTGRES_PASSWORD: '${POSTGRES_PASSWORD}' },
      healthcheck: { test: isPg ? ['CMD-SHELL','pg_isready -U ${POSTGRES_USER}'] : ['CMD','mysqladmin','ping','-h','localhost'], interval: '10s', timeout: '5s', retries: 5 },
      volumes: ['db-data:/var/lib/postgresql/data'], networks: ['app-net'],
    };
  }

  // nginx-router única porta externa para xCloud
  const extPort = opts.services[0]?.port || 3080;
  svcs['nginx-router'] = {
    image: 'nginx:alpine', ports: [`${extPort}:80`],
    configs: [{ source: 'nginx_cfg', target: '/etc/nginx/conf.d/default.conf' }],
    depends_on: opts.services.map(s => ({ service: s.name })),
    networks: ['app-net'],
  };

  const back = opts.services.find(s => s.name !== 'frontend');
  const front = opts.services.find(s => s.name !== 'backend');
  const bPort = back?.internalPort || 8000;
  const fPort = front?.port || opts.services[0]?.port || 3000;

  return {
    services: svcs,
    configs: {
      nginx_cfg: {
        content: `upstream backend { server backend:${bPort}; }\nupstream frontend { server frontend:${fPort}; }\n\nserver {\n  listen 80;\n\n  location /api/ { proxy_pass http://backend:${bPort}/; }\n  location / { proxy_pass http://frontend:${fPort}/; }\n}\n`,
      },
    },
    volumes: opts.dbType !== 'none' ? { 'db-data': {} } : undefined,
    networks: { 'app-net': { driver: 'bridge' } },
  };
}

// Helper para nginx-router para adicionar a compose existente
export function addNginxRouter(svcs: Record<string, any>, externalPort: number = 3080): { configs: Record<string,{content:string}> } {
  if (svcs['nginx-router']) return { configs: {} };
  svcs['nginx-router'] = {
    image: 'nginx:alpine', ports: [`${externalPort}:80`],
    depends_on: Object.keys(svcs).filter(k => k !== 'nginx-router'),
    networks: ['app-net'],
  };
  return {
    configs: {
      nginx_cfg: {
        content: `server {\n  listen 80;\n  location / { proxy_pass http://frontend:3000/; }\n}\n`,
      },
    },
  };
}