Secret Santa Assignment

You are tasked with creating a program that randomly assigns Secret Santa pairings from a list of participants. The program should adhere to the following requirements:

• Input: A list of participant names (strings). Optionally, each participant may include gift preferences as an additional piece of information.
• Assignment Rules:
  • Every participant must be assigned exactly one other participant to give a gift.
  • No participant should be assigned to themselves.
  • The assignment should be random and fair.
• Output: A list (or mapping) showing which participant is gifting to whom.

Additional Considerations:

• Consider how your solution will scale with a larger number of participants.
• Think about how you might adjust the algorithm if additional constraints (like avoiding pairing certain individuals) are introduced in the future.

Implement your solution in the programming language of your choice. Be sure to include tests or demonstrations of your program working with different sets of participants.