francisbourgouin / acnh-archipel Goto Github PK

Ninji has reverse-engineered the algorithm used to determine a week's turnip prices and shared the logic in a gist: https://gist.github.com/Treeki/85be14d297c80c8b3c0a76375743325b

The top half (SEAD) is some code from Nintendo's game engine for generating random numbers. This code has been pulled from simontime's Resead project.

The bottom half (starting at TurnipPrices) is the meat of the algorithm.

I found four different JS implementations that I'll use for reference. They include:

• TurnipProphet: https://github.com/mikebryant/ac-nh-turnip-prices
• ACNH Turnip Calculator: https://github.com/elxris/Turnip-Calculator
• BrettonW's test algorithm: https://github.com/brettonw/TurnipMarket
• Turnip Stalk Market: https://github.com/andrehadianto/turnip-watch-nh

ACNH Turnip Calculator seems to be the most popular as of late. Simple GUI yet tidier than TurnipProphet.

I will likely use BrettonW's algorithm as my main reference. He's done a great job in terms of clean and simple code (under 150 lines and easy to scan/read).

We're not going to be adding image upload anytime soon. Let's instead update registration and islander creation so that an avatar is generated from http://avatars.adorable.io/ and automagically saved to their profile. 😸

While storing turnip prices in a linear array is a simple temporary solution, we will need to consider how to store the data long-term.

Ideally, prices should be grouped by week. This could be a list of weeks or we could set keys for the week names (i.e., ${year}-${weekNumber}).

After the week ends, final trend name should be saved.