import * as plugins from '../plugins.js';
import { DockerContainer } from './classes.dockercontainer.js';
import { logger } from '../gitzone.logging.js';

export interface IRegisteredProject {
  projectPath: string;
  projectName: string;
  containers: {
    mongo?: string;
    minio?: string;
    elasticsearch?: string;
  };
  ports: {
    mongo?: number;
    s3?: number;
    s3Console?: number;
    elasticsearch?: number;
  };
  enabledServices: string[];
  lastActive: number;
}

export interface IGlobalRegistryData {
  projects: { [projectPath: string]: IRegisteredProject };
}

export class GlobalRegistry {
  private static instance: GlobalRegistry | null = null;
  private kvStore: plugins.npmextra.KeyValueStore<IGlobalRegistryData>;
  private docker: DockerContainer;

  private constructor() {
    this.kvStore = new plugins.npmextra.KeyValueStore({
      typeArg: 'userHomeDir',
      identityArg: 'gitzone-services',
    });
    this.docker = new DockerContainer();
  }

  /**
   * Get the singleton instance
   */
  public static getInstance(): GlobalRegistry {
    if (!GlobalRegistry.instance) {
      GlobalRegistry.instance = new GlobalRegistry();
    }
    return GlobalRegistry.instance;
  }

  /**
   * Register or update a project in the global registry
   */
  public async registerProject(data: Omit<IRegisteredProject, 'lastActive'>): Promise<void> {
    const allData = await this.kvStore.readAll();
    const projects = allData.projects || {};

    projects[data.projectPath] = {
      ...data,
      lastActive: Date.now(),
    };

    await this.kvStore.writeKey('projects', projects);
  }

  /**
   * Remove a project from the registry
   */
  public async unregisterProject(projectPath: string): Promise<void> {
    const allData = await this.kvStore.readAll();
    const projects = allData.projects || {};

    if (projects[projectPath]) {
      delete projects[projectPath];
      await this.kvStore.writeKey('projects', projects);
    }
  }

  /**
   * Update the lastActive timestamp for a project
   */
  public async touchProject(projectPath: string): Promise<void> {
    const allData = await this.kvStore.readAll();
    const projects = allData.projects || {};

    if (projects[projectPath]) {
      projects[projectPath].lastActive = Date.now();
      await this.kvStore.writeKey('projects', projects);
    }
  }

  /**
   * Get all registered projects
   */
  public async getAllProjects(): Promise<{ [path: string]: IRegisteredProject }> {
    const allData = await this.kvStore.readAll();
    return allData.projects || {};
  }

  /**
   * Check if a project is registered
   */
  public async isRegistered(projectPath: string): Promise<boolean> {
    const projects = await this.getAllProjects();
    return !!projects[projectPath];
  }

  /**
   * Get status of all containers across all registered projects
   */
  public async getGlobalStatus(): Promise<
    Array<{
      projectPath: string;
      projectName: string;
      containers: Array<{ name: string; status: string }>;
      lastActive: number;
    }>
  > {
    const projects = await this.getAllProjects();
    const result: Array<{
      projectPath: string;
      projectName: string;
      containers: Array<{ name: string; status: string }>;
      lastActive: number;
    }> = [];

    for (const [path, project] of Object.entries(projects)) {
      const containerStatuses: Array<{ name: string; status: string }> = [];

      for (const containerName of Object.values(project.containers)) {
        if (containerName) {
          const status = await this.docker.getStatus(containerName);
          containerStatuses.push({ name: containerName, status });
        }
      }

      result.push({
        projectPath: path,
        projectName: project.projectName,
        containers: containerStatuses,
        lastActive: project.lastActive,
      });
    }

    return result;
  }

  /**
   * Stop all containers across all registered projects
   */
  public async stopAll(): Promise<{ stopped: string[]; failed: string[] }> {
    const projects = await this.getAllProjects();
    const stopped: string[] = [];
    const failed: string[] = [];

    for (const project of Object.values(projects)) {
      for (const containerName of Object.values(project.containers)) {
        if (containerName) {
          const status = await this.docker.getStatus(containerName);
          if (status === 'running') {
            if (await this.docker.stop(containerName)) {
              stopped.push(containerName);
            } else {
              failed.push(containerName);
            }
          }
        }
      }
    }

    return { stopped, failed };
  }

  /**
   * Remove stale registry entries (projects that no longer exist on disk)
   */
  public async cleanup(): Promise<string[]> {
    const projects = await this.getAllProjects();
    const removed: string[] = [];

    for (const projectPath of Object.keys(projects)) {
      const exists = await plugins.smartfs.directory(projectPath).exists();
      if (!exists) {
        await this.unregisterProject(projectPath);
        removed.push(projectPath);
      }
    }

    return removed;
  }
}