Personal Bests

Tachi has a lot of scenarios where it needs to reference a users best score alongside their best lamp.

This is a standard for most arcade games to conjoin the best aspects of all your scores, so Tachi needs to replicate that behaviour.

However, not all games agree on what aspects to join about scores. Although in most scenarios we will be joining a user's best lamp with their best score, there are some games (like IIDX) which have other statistics that need to be conjoined.

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Calculating Personal Bests

A user is only allowed one personal best per chart, this allows us to know what personal bests need to be modified by looking at the set of chartIDs modified from this import.

We can iterate over that set and recalculate the users personal best for each chart.

Firstly, we select the users score on the chart with the highest percent, then we select the users score on the chart with the highest lampIndex.

We can then join the relevant properties of this into a PBScore, where the best parts of the lampPB are unioned with the best part of the scorePB.

Info

A ScorePB refers to a user's best Percent/Score on a chart.

A PBScore refers to the aforementioned conjoined score document.

Game Specific Things

Some games require specific conjoining code. The below games have said exceptional behaviour.

SDVX, USC

VF5 and VF6 depends on the users best lamp and their best score.

That is, you cannot just select the larger volforce from the two scores, as HC 9m -> NC 9.1M should have the volforce of HC 9.1M.

IIDX, BMS

IIDX and BMS have BP. This number is the amount of bads plus the amount of poors a player made. The lowest non-null value for this should be selected as that property for the PBScore.