Facade

class CPU {
  start(): void {
    console.log("CPU started");
  }
}

class Memory {
  load(position: number, data: string): void {
    console.log(`Loading data ${data} at position ${position}`);
  }
}

class HardDrive {
  read(position: number, size: number): string {
    console.log(`Reading ${size} data from position ${position}`);
    return "data";
  }
}

// Facade: This is the class that simplifies the interface to the subsystems.
class Computer {
  private cpu: CPU;
  private memory: Memory;
  private hardDrive: HardDrive;

  constructor() {
    this.cpu = new CPU();
    this.memory = new Memory();
    this.hardDrive = new HardDrive();
  }

  start(): void {
    this.cpu.start();
    const data = this.hardDrive.read(1000, 200);
    this.memory.load(0, data);
    console.log("Computer started");
  }
}

// Client Code: The client interacts with the subsystems through the simplified interface provided by the facade.
const computer = new Computer();
computer.start();
// Output:
// CPU started
// Reading 200 data from position 1000
// Loading data data at position 0
// Computer started