kotlinDSL.kt

fun main(){

    val company = Company("DevMaster")
    val department = Department("Programming")
    val employeeAhmed = Employee("Mahmoud", 26)
    val employeeMahmoud = Employee("Ammar", 1)
    val employeeMariam = Employee("Mariam", 23)
    department.addEmployee(employeeAhmed)
    department.addEmployee(employeeMahmoud)
    department.addEmployee(employeeMariam)
    company.addDepartment(department)

    val companyDSL = buildCompany("DevMaster") {
        department("Programming") {
            employee {
                name = "Mahmoud"
                age =  26
            }
            employee {
                name = "Ammar"
                age =  1
            }
            employee {
                name = "Mariam"
                age =  23
            }
        }
    }

    company.print()
    companyDSL.print()
}


fun buildCompany(name: String, build: Company.() -> Unit): Company {
    val company = Company(name)
    build.invoke(company)
    return company
}

class Company(private val name: String){
    private val departments = mutableListOf<Department>()

    fun department(departName: String , build:Department.() -> Unit){
        val department = Department(departName)
        build.invoke(department)
        departments.add(department)
    }

    fun addDepartment(department: Department){
        departments.add(department)
    }

    fun print(){
        println(name)
        departments.forEach {
            println("Dep Name: ${it.name}")
            it.print()
        }
    }
}

class Department(val name: String){
    private val employees = mutableListOf<Employee>()

    fun employee(build:Employee.() -> Unit){
        val employee = Employee()
        build.invoke(employee)
        employees.add(employee)
    }

    fun addEmployee(employee: Employee){
        employees.add(employee)
    }

    fun print() {
        println("Dep Employees: ${employees.joinToString { it.name }}")
    }

}

data class Employee(var name:String = "" , var age:Int = 0 )