import { execSync } from 'child_process';
import * as path from 'path';
import * as fs from 'fs';

/**
 * Docker container lifecycle management for E2E tests
 */

export interface DockerComposeConfig {
  projectName: string;
  composePath: string;
  envVars: Record<string, string>;
}

/**
 * Start Docker Compose services for a workflow
 */
export async function startDockerCompose(config: DockerComposeConfig): Promise<void> {
  const { projectName, composePath, envVars } = config;

  // Prepare environment variables
  const envString = Object.entries(envVars)
    .map(([key, value]) => `${key}="${value}"`)
    .join(' ');

  try {
    // Use docker-compose up
    execSync(
      `cd ${path.dirname(composePath)} && ${envString} docker-compose -f ${path.basename(composePath)} -p ${projectName} up -d`,
      { stdio: 'inherit' }
    );

    console.log(`Docker Compose services started for project: ${projectName}`);
  } catch (error) {
    throw new Error(`Failed to start Docker Compose: ${error}`);
  }
}

/**
 * Stop and remove Docker Compose services
 */
export async function stopDockerCompose(projectName: string, composePath: string): Promise<void> {
  try {
    execSync(
      `cd ${path.dirname(composePath)} && docker-compose -f ${path.basename(composePath)} -p ${projectName} down`,
      { stdio: 'inherit' }
    );

    console.log(`Docker Compose services stopped for project: ${projectName}`);
  } catch (error) {
    console.warn(`Warning stopping Docker Compose: ${error}`);
  }
}

/**
 * Wait for a service to be healthy
 */
export async function waitForServiceHealthy(
  projectName: string,
  serviceName: string,
  maxRetries: number = 30
): Promise<void> {
  let retries = 0;

  while (retries < maxRetries) {
    try {
      const health = execSync(
        `docker inspect --format='{{json .State.Health}}' ${projectName}_${serviceName}_1 2>/dev/null || echo '{"Status":"none"}'`,
        { encoding: 'utf-8' }
      ).trim();

      const healthStatus = JSON.parse(health || '{"Status":"none"}');

      if (healthStatus.Status === 'healthy') {
        console.log(`Service ${serviceName} is healthy`);
        return;
      }

      retries++;
      await new Promise((resolve) => setTimeout(resolve, 1000)); // Wait 1 second
    } catch (error) {
      retries++;
      await new Promise((resolve) => setTimeout(resolve, 1000));
    }
  }

  throw new Error(`Service ${serviceName} did not become healthy after ${maxRetries} seconds`);
}

/**
 * Get container logs
 */
export async function getContainerLogs(
  projectName: string,
  serviceName: string,
  tail: number = 50
): Promise<string> {
  try {
    return execSync(`docker-compose -p ${projectName} logs --tail=${tail} ${serviceName}`, {
      encoding: 'utf-8',
    });
  } catch (error) {
    return `Error getting logs: ${error}`;
  }
}

/**
 * Check if service is running
 */
export async function isServiceRunning(
  projectName: string,
  serviceName: string
): Promise<boolean> {
  try {
    execSync(`docker-compose -p ${projectName} ps ${serviceName} | grep -q "Up"`, { stdio: 'ignore' });
    return true;
  } catch {
    return false;
  }
}

/**
 * Restart a service
 */
export async function restartService(projectName: string, serviceName: string): Promise<void> {
  try {
    execSync(`docker-compose -p ${projectName} restart ${serviceName}`, { stdio: 'inherit' });
    console.log(`Service ${serviceName} restarted`);
  } catch (error) {
    throw new Error(`Failed to restart service ${serviceName}: ${error}`);
  }
}

/**
 * Get service port mapping
 */
export async function getServicePort(
  projectName: string,
  serviceName: string,
  containerPort: number
): Promise<number | null> {
  try {
    const output = execSync(
      `docker-compose -p ${projectName} port ${serviceName} ${containerPort}`,
      { encoding: 'utf-8' }
    ).trim();

    const match = output.match(/:(\d+)$/);
    return match ? parseInt(match[1], 10) : null;
  } catch {
    return null;
  }
}

/**
 * Execute command inside container
 */
export async function execInContainer(
  projectName: string,
  serviceName: string,
  command: string[]
): Promise<string> {
  try {
    const cmd = `docker-compose -p ${projectName} exec -T ${serviceName} ${command.join(' ')}`;
    return execSync(cmd, { encoding: 'utf-8' });
  } catch (error) {
    throw new Error(`Failed to execute command in container: ${error}`);
  }
}

/**
 * Get service status
 */
export async function getServiceStatus(
  projectName: string,
  serviceName: string
): Promise<string> {
  try {
    const output = execSync(`docker-compose -p ${projectName} ps ${serviceName}`, {
      encoding: 'utf-8',
    });

    const lines = output.split('\n');
    if (lines.length > 1) {
      const statusLine = lines[1];
      const status = statusLine.split(/\s{2,}/)[4] || 'Unknown';
      return status;
    }

    return 'Unknown';
  } catch {
    return 'Not found';
  }
}

/**
 * Clean up all Docker resources for a project
 */
export async function cleanupProject(projectName: string): Promise<void> {
  try {
    // Stop containers
    execSync(`docker-compose -p ${projectName} down --remove-orphans`, {
      stdio: 'ignore',
    });

    // Remove volumes
    execSync(`docker volume prune -f`, { stdio: 'ignore' });

    console.log(`Cleanup complete for project: ${projectName}`);
  } catch (error) {
    console.warn(`Cleanup warning: ${error}`);
  }
}

/**
 * Wait for multiple services
 */
export async function waitForAllServices(
  projectName: string,
  services: string[],
  maxRetries: number = 30
): Promise<void> {
  const promises = services.map((service) => waitForServiceHealthy(projectName, service, maxRetries));

  try {
    await Promise.all(promises);
    console.log(`All services are healthy for project: ${projectName}`);
  } catch (error) {
    throw new Error(`Failed to wait for services: ${error}`);
  }
}

/**
 * Generate compose file with specific ports and env vars
 */
export function generateComposeEnvVars(
  workflowId: string,
  ports: { backend: number; frontend: number; ldap: number },
  ldapEnabled: boolean = true
): Record<string, string> {
  return {
    WORKFLOW_ID: workflowId,
    BACKEND_PORT: ports.backend.toString(),
    FRONTEND_PORT: ports.frontend.toString(),
    LDAP_PORT: ports.ldap.toString(),
    LDAP_ENABLED: ldapEnabled ? 'true' : 'false',
    LDAP_SERVER: `localhost:${ports.ldap}`,
    LDAP_BASE_DN: 'dc=ainventory,dc=local',
    AI_PROVIDER: 'gemini',
    LOG_LEVEL: 'INFO',
  };
}

/**
 * Wait for port to be available
 */
export async function waitForPort(
  port: number,
  host: string = 'localhost',
  timeout: number = 30000
): Promise<void> {
  const startTime = Date.now();

  while (Date.now() - startTime < timeout) {
    try {
      execSync(`curl -s http://${host}:${port}/health >/dev/null 2>&1 || false`, {
        stdio: 'ignore',
      });
      return; // Port is available
    } catch {
      await new Promise((resolve) => setTimeout(resolve, 500));
    }
  }

  throw new Error(`Port ${port} did not become available after ${timeout}ms`);
}