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export const UserServiceProvider = (function () {
let instance;
async function createInstance(user) {
switch (user.role) {
case 'STUDENT':
const studentService = await import('./student');
if (studentService) {
return new studentService.default(user);
}
break;
case 'PROFESSOR':
const professorService = await import('./professor');
if (professorService) {
return new professorService.default(user);
}
break;
default:
throw new Error('Invalid Role!');
}
}
return {
getInstance: async function (user) {
if (!instance) {
instance = await createInstance(user);
}
return instance;
},
};
})();
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