# Daily Checkin Points

Daily Checkin Points (DCP) is a feature of the NFT-voucher system that rewards users for gym attendance and manages access based on NFT tiers.

## Overview

* DCP are granted when a customer buys or renews an NFT
* Points reset daily
* Both NFTs and gyms have tiers (1-99)
* DCP are consumed when checking in at a gym

## DCP Calculation

The amount of DCP granted daily is calculated as:

```
DCP = 2^(NFT_tier)
```

Where `NFT_tier` ranges from 1 to 99.

## Checkin Rules

1. **Gym Access Limit**: The number of times a user can access the same gym per day is equal to their NFT tier.
   * Example: Tier 1 NFT allows 1 visit, Tier 2 allows 2 visits, etc.
2. **DCP Consumption**: When checking in, the user consumes DCP based on the gym's tier:

   ```
   DCP_consumed = 2^(gym_tier)
   ```
3. **Checkin Requirement**: The user must have enough DCP to cover the gym's requirement.

## Examples

1. User with Tier 3 NFT:
   * Daily DCP: 2³ = 8 points
   * Can visit the same gym up to 3 times per day
2. Checking in at a Tier 2 gym:
   * DCP required: 2² = 4 points
   * User's remaining DCP after checkin: 8 - 4 = 4 points
3. Attempting to check in at a Tier 7 gym:
   * DCP required: 2⁷ = 128 points
   * Checkin fails (insufficient DCP)

## Implementation Considerations

* Reset DCP daily at a specific time (e.g., midnight)
* Track daily gym visits per user
* Implement DCP calculation and consumption logic
* Handle edge cases (e.g., insufficient DCP, exceeding daily gym limit)


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