• Approach
• Directory Strcuture
• Running Test Case
• Scope
  • User Story
  • Actions
  • Ratio Calculation
  • Schema

I have followed TDD approach to get to a solution.

in order to make customers reference code unique i have used md5(email, name).

There are 2 types of Deposit plans in this application:

will only execute once and in order to be successfull the customer must deposit the exact amount of money to the portfolio.

This will be a recurring plan so the customer can deposit the amount monthly.

Once customer reaches target amount portfolio will be credited with the amount. a flag will be set to true to indicate that the plan has reached the target.

|-- deposit_plan
|   |-- config
|   |   |-- exception.py
|-- |-- customer
|   |   |-- customer.py
|   |   |-- portfolio.py
|   |   |-- __init__.py
|-- |-- deposit
|   |   |-- deposit_plan.py
|   |   |-- __init__.py

$ python3 test_sample.py

Below is my findings and assumptions about the problem.

• As a Customer i will have a unique Reference code to do all operations
• As a Customer i can create max of 2 unique Deposit Plan with portfolio
• As a Customer i can deposit fund via bank transfer to my portfolio

• Create Customer
• Create Deposit Plan with respective portfolio plan types either one time or reccuring/monthly can specify the percentage or ratio of amount to be deposited per portfolio
• Start depositing update portfolio with deposit amount

Once we created a deposit plan we will have to calculate the ratio of the amount to be credited to each portfolio.

for finding ratio

x_ratio = x / x + y
y_ratio = y / x + y

when the customer deposit an amount we will use this ratio to allocate the amount to each portfolio.

allocation of amount based on ratio

portfolio_1 = (x_ratio / x_ratio + y_ratio) * deposited_amount
portfolio_2 = (y_ratio / x_ratio + y_ratio) * deposited_amount

Customer:
    - name: string
    - email: string
    - age: int
    - reference_code: md5(email, name)
    - deposit_plans: [DepositPlan]

Portfolio:
    - reference_code: customer_reference_code
    - name: string
    - balance: float
    - target_amount: float
    - target_achieved: boolean

DepositPlan:
    - reference_code: customer_reference_code
    - portfolios: [{portfolio: Portfolio, amount: float}]
    - recurring: boolean, default: false