Module koi 

Reproducible koi development from account observations, independent of rendering.

Structs

KoiDevelopment

Derived inputs for appearance; source observations remain in the account snapshot.

RecentActivity

Recent activity as of the observation date, as counts rather than judgments.

StreakDevelopment

Weekly streaks: runs of consecutive Monday-Sunday weeks with at least one active day.

Enums

KoiDevelopmentError

Why a snapshot produced no development. Each message names the repair.

RecentStreak

The most recent streak, still running or ended.

Constants

ADULT_CONTRIBUTIONS

The adult form: past this total the body keeps lengthening and the fins and tail grow, but the anatomy is settled.

FULL_COLOR_CONTRIBUTIONS

Young koi show their language pigments pale until this total.

MAX_GROWTH_CONTRIBUTIONS

Growth stops here; larger totals keep the maximum form.

YOUNG_SHAPE_CONTRIBUTIONS

Young koi grow into the adult head, eyes, body width, and fins by this total.

Functions

calculate_growth_fraction

Map total contributions to a growth fraction from zero through one. Gains diminish until MAX_GROWTH_CONTRIBUTIONS; larger totals stay at one. The caller supplies the observed total; elapsed time does not affect growth.

derive_koi_development

Derive one account’s identity, language composition, and contribution development.