Implemented dynamic xp for each level

[KashGiannis34]

Implemented dynamic xp for each level

Issue Number(s): #157

What does this PR change and why?

Added the dynamic xp req for each level. 90xp for level 0, 100xp for level 1, etc. Didn't need to change tutorial logic because the user only gets 5 xp from that anyway so they cant level up from it.

Checklist

• Requirements have been implemented
• Acceptance criteria is met
• Database schema docs have been updated or are not necessary
• Code follows design and style guidelines
• Commits follow guidelines (concise, squashed, etc)
• Relevant reviewers (Senior Dev/EM/Designers) have been assigned to this PR

Critical Changes

N/A

Related PRs

• Streaks and Dynamic XP #200

Testing

Tested manually.

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[greptile-apps]

Disclaimer: This comment was AI-generated and is not necessarily completely accurate. Please take code comments with a grain of salt.

Greptile Summary

• Replaced hardcoded 100 XP level threshold with dynamic formula: 90 XP for level 0, increasing by 10 XP per level
• Updated backend leveling logic and frontend components to calculate XP requirements dynamically per level

Confidence Score: 4/5

• Safe to merge with one edge case limitation in existing leveling logic
• Implementation correctly handles normal gameplay scenarios where pets gain 5 XP per feeding. The dynamic XP formula matches requirements (90 + level*10). However, the leveling logic in pets.ts only increments level once per feeding, so if a pet somehow accumulated enough XP to skip multiple levels, it would only level up once. Given current game mechanics (5 XP per feeding, 90+ XP thresholds), this edge case is unlikely to occur in practice.
• Review src/services/pets.ts:103-107 to understand the leveling logic limitation with multi-level XP gains

Important Files Changed

Filename	Overview
src/utils/constants.ts	Replaced hardcoded LEVEL_THRESHOLD constant with dynamic calculateXPForLevel function implementing the 90 + level*10 formula
src/services/pets.ts	Updated feedPet to calculate XP threshold dynamically per level; logic correct for normal gameplay but won't handle multi-level jumps

Sequence Diagram

sequenceDiagram
    participant User
    participant "feedPet()" as Feed
    participant "calculateXPForLevel()" as Calc
    participant Database
    
    User->>Feed: "Feed pet"
    Feed->>Database: "Get pet by petId"
    Database-->>Feed: "Return pet (level, xpGained, food)"
    Feed->>Feed: "Decrement food"
    Feed->>Calc: "calculateXPForLevel(currentLevel)"
    Calc-->>Feed: "Return threshold (90 + level*10)"
    Feed->>Feed: "Check if xpGained >= threshold - 5"
    alt "Level up"
        Feed->>Feed: "Increment level"
        Feed->>Feed: "Add 100 coins"
        Feed->>Feed: "Calculate overflow XP"
    else "No level up"
        Feed->>Feed: "Add 5 XP"
    end
    Feed->>Database: "Update pet (xpGained, xpLevel, food, coins)"
    Database-->>Feed: "Confirm update"
    Feed-->>User: "Return updated pet"

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[greptile-apps]

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