# All files / src/preview compose-generator.ts

98.07% Statements 51/52
79.41% Branches 27/34
100% Functions 4/4
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     /**
     * Docker Compose Generator
     *
     * Generates docker-compose.preview.yml and Caddyfile for preview deployments.
     * All services share a Docker network; only Caddy publishes a host port.
     */

    import yaml from 'js-yaml';
    import type { PreviewConfig, PreviewServiceConfig } from './types.js';
    import { PREVIEW_LABELS } from './types.js';

    export interface ComposeGeneratorOptions {
      projectPath: string;
      port: number;
      deploymentId: string;
      labels: Record<string, string>;
    }

    interface ComposeService {
      build?: { context: string; dockerfile: string } | string;
      image?: string;
      environment?: Record<string, string>;
      volumes?: string[];
      labels?: Record<string, string>;
      networks?: string[];
      depends_on?: string[];
    }

    interface ComposeFile {
      services: Record<string, ComposeService>;
      networks: Record<string, { driver: string }>;
    }

    /**
     * Generate a Docker Compose YAML string for the preview deployment.
     *
     * Structure:
     * - User-defined services with build contexts
     * - Caddy reverse proxy publishing the single host port
     * - Shared `preview` network
     */
    export function generateComposeFile(
      config: PreviewConfig,
      opts: ComposeGeneratorOptions,
    ): string {
      const compose: ComposeFile = {
        services: {},
        networks: {
          preview: { driver: 'bridge' },
        },
      };

      const serviceNames: string[] = [];

      // Add user-defined services
      for (const [name, svc] of Object.entries(config.services)) {
        serviceNames.push(name);
        const service: ComposeService = {
          labels: { ...opts.labels },
          networks: ['preview'],
        };

        // Build config
        if (svc.build) {
          if (typeof svc.build === 'string') {
            service.build = {
              context: opts.projectPath,
              dockerfile: svc.build === '.' ? 'Dockerfile' : svc.build,
            };
          } else {
            service.build = {
              context: svc.build.context.startsWith('/')
                ? svc.build.context
                : `${opts.projectPath}/${svc.build.context}`,
              dockerfile: svc.build.dockerfile,
            };
          }
        E} else if (svc.image) {
          service.image = svc.image;
        }

        // Environment
        if (svc.env && Object.keys(svc.env).length > 0) {
          service.environment = svc.env;
        }

        // Volumes
        Iif (svc.volumes && svc.volumes.length > 0) {
          service.volumes = svc.volumes;
        }

        compose.services[name] = service;
      }

      // Generate and add Caddy proxy service
      const caddyfile = generateCaddyfile(config);
      const caddyService: ComposeService = {
        image: 'caddy:2-alpine',
        networks: ['preview'],
        labels: { ...opts.labels },
      };

      // Caddy publishes the single host port
      (caddyService as Record<string, unknown>).ports = [`${opts.port}:80`];

      // Mount Caddyfile via inline config
      (caddyService as Record<string, unknown>).command = ['caddy', 'run', '--config', '/etc/caddy/Caddyfile'];

      // Caddy config will be written to the deployment directory and mounted
      (caddyService as Record<string, unknown>).volumes = ['./Caddyfile:/etc/caddy/Caddyfile:ro'];

      Eif (serviceNames.length > 0) {
        caddyService.depends_on = serviceNames;
      }

      compose.services['caddy-proxy'] = caddyService;

      return yaml.dump(compose, { lineWidth: 120, noRefs: true });
    }

    /**
     * Generate a Caddyfile from route mappings in the preview config.
     *
     * Routes are sorted by specificity (longest path first) to ensure
     * more specific routes match before catch-all.
     */
    export function generateCaddyfile(config: PreviewConfig): string {
      const routes: Array<{ name: string; route: string; port: number }> = [];

      for (const [name, svc] of Object.entries(config.services)) {
        if (svc.internal) continue;
        routes.push({
          name,
          route: svc.route ?? '/',
          port: svc.port,
        });
      }

      // Sort by route specificity (longer paths first, root last)
      routes.sort((a, b) => {
        if (a.route === '/') return 1;
        if (b.route === '/') return -1;
        return b.route.length - a.route.length;
      });

      const lines: string[] = [':80 {'];

      for (const route of routes) {
        if (route.route === '/') {
          lines.push(`  handle {`);
          lines.push(`    reverse_proxy ${route.name}:${route.port}`);
          lines.push(`  }`);
        } else {
          // Strip trailing slash for handle_path
          const path = route.route.endsWith('/') ? route.route.slice(0, -1) : route.route;
          lines.push(`  handle_path ${path}/* {`);
          lines.push(`    reverse_proxy ${route.name}:${route.port}`);
          lines.push(`  }`);
        }
      }

      lines.push('}');
      return lines.join('\n');
    }

    /**
     * Generate compose labels for a preview deployment.
     */
    export function generateLabels(opts: {
      initiativeId: string;
      phaseId?: string;
      projectId: string;
      branch: string;
      port: number;
      previewId: string;
    }): Record<string, string> {
      const labels: Record<string, string> = {
        [PREVIEW_LABELS.preview]: 'true',
        [PREVIEW_LABELS.initiativeId]: opts.initiativeId,
        [PREVIEW_LABELS.projectId]: opts.projectId,
        [PREVIEW_LABELS.branch]: opts.branch,
        [PREVIEW_LABELS.port]: String(opts.port),
        [PREVIEW_LABELS.previewId]: opts.previewId,
      };

      if (opts.phaseId) {
        labels[PREVIEW_LABELS.phaseId] = opts.phaseId;
      }

      return labels;
    }