# All files / src/preview manager.ts

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97.43% Branches 38/39
73.68% Functions 14/19
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     /**
     * Preview Manager
     *
     * Orchestrates preview deployment lifecycle: start, stop, list, status.
     * Uses Docker as the source of truth — no database persistence.
     */

    import { join } from 'node:path';
    import { mkdir, writeFile, rm } from 'node:fs/promises';
    import { nanoid } from 'nanoid';
    import type { ProjectRepository } from '../db/repositories/project-repository.js';
    import type { EventBus } from '../events/types.js';
    import type {
      PreviewStatus,
      StartPreviewOptions,
    } from './types.js';
    import { COMPOSE_PROJECT_PREFIX, PREVIEW_LABELS } from './types.js';
    import { discoverConfig } from './config-reader.js';
    import { generateComposeFile, generateCaddyfile, generateLabels } from './compose-generator.js';
    import {
      isDockerAvailable,
      composeUp,
      composeDown,
      composePs,
      listPreviewProjects,
      getContainerLabels,
    } from './docker-client.js';
    import { waitForHealthy } from './health-checker.js';
    import { allocatePort } from './port-allocator.js';
    import { getProjectCloneDir } from '../git/project-clones.js';
    import { createModuleLogger } from '../logger/index.js';
    import type {
      PreviewBuildingEvent,
      PreviewReadyEvent,
      PreviewStoppedEvent,
      PreviewFailedEvent,
    } from '../events/types.js';

    const log = createModuleLogger('preview');

    /** Directory for preview deployment artifacts (relative to workspace root) */
    const PREVIEWS_DIR = '.cw-previews';

    export class PreviewManager {
      private readonly projectRepository: ProjectRepository;
      private readonly eventBus: EventBus;
      private readonly workspaceRoot: string;

      constructor(
        projectRepository: ProjectRepository,
        eventBus: EventBus,
        workspaceRoot: string,
      ) {
        this.projectRepository = projectRepository;
        this.eventBus = eventBus;
        this.workspaceRoot = workspaceRoot;
      }

      /**
       * Start a preview deployment.
       *
       * 1. Check Docker availability
       * 2. Resolve project clone path
       * 3. Discover config from project at target branch
       * 4. Allocate port, generate ID
       * 5. Generate compose + Caddyfile, write to .cw-previews/<id>/
       * 6. Run composeUp, wait for healthy
       * 7. Emit events and return status
       */
      async start(options: StartPreviewOptions): Promise<PreviewStatus> {
        // 1. Check Docker
        if (!(await isDockerAvailable())) {
          throw new Error(
            'Docker is not available. Please ensure Docker is installed and running.',
          );
        }

        // 2. Resolve project
        const project = await this.projectRepository.findById(options.projectId);
        if (!project) {
          throw new Error(`Project '${options.projectId}' not found`);
        }

        const clonePath = join(
          this.workspaceRoot,
          getProjectCloneDir(project.name, project.id),
        );

        // 3. Discover config
        const config = await discoverConfig(clonePath);

        // 4. Allocate port and generate ID
        const port = await allocatePort();
        const id = nanoid(10);
        const projectName = `${COMPOSE_PROJECT_PREFIX}${id}`;

        // 5. Generate compose artifacts
        const labels = generateLabels({
          initiativeId: options.initiativeId,
          phaseId: options.phaseId,
          projectId: options.projectId,
          branch: options.branch,
          port,
          previewId: id,
        });

        const composeYaml = generateComposeFile(config, {
          projectPath: clonePath,
          port,
          deploymentId: id,
          labels,
        });
        const caddyfile = generateCaddyfile(config);

        // Write artifacts
        const deployDir = join(this.workspaceRoot, PREVIEWS_DIR, id);
        await mkdir(deployDir, { recursive: true });

        const composePath = join(deployDir, 'docker-compose.yml');
        await writeFile(composePath, composeYaml, 'utf-8');
        await writeFile(join(deployDir, 'Caddyfile'), caddyfile, 'utf-8');

        log.info({ id, projectName, port, composePath }, 'preview deployment prepared');

        // 6. Emit building event
        this.eventBus.emit<PreviewBuildingEvent>({
          type: 'preview:building',
          timestamp: new Date(),
          payload: { previewId: id, initiativeId: options.initiativeId, branch: options.branch, port },
        });

        // 7. Build and start
        try {
          await composeUp(composePath, projectName);
        } catch (error) {
          log.error({ id, err: error }, 'compose up failed');

          this.eventBus.emit<PreviewFailedEvent>({
            type: 'preview:failed',
            timestamp: new Date(),
            payload: {
              previewId: id,
              initiativeId: options.initiativeId,
              error: (error as Error).message,
            },
          });

          // Clean up
          await composeDown(projectName).catch(() => {});
          await rm(deployDir, { recursive: true, force: true }).catch(() => {});

          throw new Error(`Preview build failed: ${(error as Error).message}`);
        }

        // 8. Health check
        const healthResults = await waitForHealthy(port, config);
        const allHealthy = healthResults.every((r) => r.healthy);

        if (!allHealthy && healthResults.length > 0) {
          const failedServices = healthResults
            .filter((r) => !r.healthy)
            .map((r) => r.name);
          log.warn({ id, failedServices }, 'some services failed health checks');

          this.eventBus.emit<PreviewFailedEvent>({
            type: 'preview:failed',
            timestamp: new Date(),
            payload: {
              previewId: id,
              initiativeId: options.initiativeId,
              error: `Health checks failed for: ${failedServices.join(', ')}`,
            },
          });

          await composeDown(projectName).catch(() => {});
          await rm(deployDir, { recursive: true, force: true }).catch(() => {});

          throw new Error(
            `Preview health checks failed for services: ${failedServices.join(', ')}`,
          );
        }

        // 9. Success
        const url = `http://localhost:${port}`;
        log.info({ id, url }, 'preview deployment ready');

        this.eventBus.emit<PreviewReadyEvent>({
          type: 'preview:ready',
          timestamp: new Date(),
          payload: {
            previewId: id,
            initiativeId: options.initiativeId,
            branch: options.branch,
            port,
            url,
          },
        });

        const services = await composePs(projectName);

        return {
          id,
          projectName,
          initiativeId: options.initiativeId,
          phaseId: options.phaseId,
          projectId: options.projectId,
          branch: options.branch,
          port,
          status: 'running',
          services,
          composePath,
        };
      }

      /**
       * Stop a preview deployment and clean up artifacts.
       */
      async stop(previewId: string): Promise<void> {
        const projectName = `${COMPOSE_PROJECT_PREFIX}${previewId}`;

        // Get labels before stopping to emit event
        const labels = await getContainerLabels(projectName);
        const initiativeId = labels[PREVIEW_LABELS.initiativeId] ?? '';

        await composeDown(projectName);

        // Clean up deployment directory
        const deployDir = join(this.workspaceRoot, PREVIEWS_DIR, previewId);
        await rm(deployDir, { recursive: true, force: true }).catch(() => {});

        log.info({ previewId, projectName }, 'preview stopped');

        this.eventBus.emit<PreviewStoppedEvent>({
          type: 'preview:stopped',
          timestamp: new Date(),
          payload: { previewId, initiativeId },
        });
      }

      /**
       * List all active preview deployments, optionally filtered by initiative.
       */
      async list(initiativeId?: string): Promise<PreviewStatus[]> {
        const projects = await listPreviewProjects();
        const previews: PreviewStatus[] = [];

        for (const project of projects) {
          const labels = await getContainerLabels(project.Name);
          if (!labels[PREVIEW_LABELS.preview]) continue;

          const preview = this.labelsToStatus(project.Name, labels, project.ConfigFiles);
          if (!preview) continue;

          if (initiativeId && preview.initiativeId !== initiativeId) continue;

          // Get service statuses
          preview.services = await composePs(project.Name);
          previews.push(preview);
        }

        return previews;
      }

      /**
       * Get the status of a specific preview deployment.
       */
      async getStatus(previewId: string): Promise<PreviewStatus | null> {
        const projectName = `${COMPOSE_PROJECT_PREFIX}${previewId}`;
        const labels = await getContainerLabels(projectName);

        if (!labels[PREVIEW_LABELS.preview]) {
          return null;
        }

        const preview = this.labelsToStatus(projectName, labels, '');
        Iif (!preview) return null;

        preview.services = await composePs(projectName);

        // Determine status from service states
        if (preview.services.length === 0) {
          preview.status = 'stopped';
        } else if (preview.services.every((s) => s.state === 'running')) {
          preview.status = 'running';
        } else if (preview.services.some((s) => s.state === 'exited' || s.state === 'dead')) {
          preview.status = 'failed';
        } else {
          preview.status = 'building';
        }

        return preview;
      }

      /**
       * Stop all preview deployments. Called on server shutdown.
       */
      async stopAll(): Promise<void> {
        const projects = await listPreviewProjects();
        log.info({ count: projects.length }, 'stopping all preview deployments');

        await Promise.all(
          projects.map(async (project) => {
            const id = project.Name.replace(COMPOSE_PROJECT_PREFIX, '');
            await this.stop(id).catch((err) => {
              log.warn({ projectName: project.Name, err }, 'failed to stop preview');
            });
          }),
        );
      }

      /**
       * Reconstruct PreviewStatus from Docker container labels.
       */
      private labelsToStatus(
        projectName: string,
        labels: Record<string, string>,
        composePath: string,
      ): PreviewStatus | null {
        const previewId = labels[PREVIEW_LABELS.previewId] ?? projectName.replace(COMPOSE_PROJECT_PREFIX, '');
        const initiativeId = labels[PREVIEW_LABELS.initiativeId];
        const projectId = labels[PREVIEW_LABELS.projectId];
        const branch = labels[PREVIEW_LABELS.branch];
        const port = parseInt(labels[PREVIEW_LABELS.port] ?? '0', 10);

        if (!initiativeId || !projectId || !branch) {
          return null;
        }

        return {
          id: previewId,
          projectName,
          initiativeId,
          phaseId: labels[PREVIEW_LABELS.phaseId],
          projectId,
          branch,
          port,
          status: 'running',
          services: [],
          composePath,
        };
      }
    }