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-module(city). | |
-include("city.hrl"). | |
-author("Yvan"). | |
%% ------------------------------------------------------------------ | |
%% API Function Exports | |
%% ------------------------------------------------------------------ | |
-export([new/0,plague/1,preturnPopulation/1,preturnHealth/1]). | |
-define(IS_HEALTH_LOW(X), X < 4). | |
-define(IS_HEALTH_VERYLOW(X), X < 2). | |
-define(IS_HEALTH_HIGH(X), X > 8). | |
-define(LOW_FOOD,3). | |
-define(VERYLOW_FOOD,1). | |
-define(HIGH_FOOD,8). | |
%% ------------------------------------------------------------------ | |
%% API Function Definitions | |
%% ------------------------------------------------------------------ | |
new() -> #city{}. | |
plague(#city{health = CurrentHealth} = City) -> | |
City#city{health = gauge:decrement(CurrentHealth)}. | |
nextPopulation(CurrentPopulation, CurrentHealth) | |
when ?IS_HEALTH_VERYLOW(CurrentHealth) | |
-> gauge:decrement(gauge:decrement(CurrentPopulation)); | |
nextPopulation(CurrentPopulation, CurrentHealth) | |
when ?IS_HEALTH_LOW(CurrentHealth) | |
-> gauge:decrement(CurrentPopulation); | |
nextPopulation(CurrentPopulation, CurrentHealth) | |
when ?IS_HEALTH_HIGH(CurrentHealth) | |
-> gauge:increment(CurrentPopulation); | |
nextPopulation(CurrentPopulation, _) | |
-> CurrentPopulation. | |
preturnPopulation(#city{population = CurrentPopulation, health = CurrentHealth} = City) -> | |
City#city{population = nextPopulation(CurrentPopulation, CurrentHealth)}. | |
preturnHealth(#city{health = CurrentHealth, food = CurrentFood} = City) -> | |
case City of | |
_ when CurrentFood < ?VERYLOW_FOOD -> | |
NewHealth = gauge:decrement(gauge:decrement(CurrentHealth)); | |
_ when CurrentFood < ?LOW_FOOD -> | |
NewHealth = gauge:decrement(CurrentHealth); | |
_ when CurrentFood >= ?HIGH_FOOD -> | |
NewHealth = gauge:increment(CurrentHealth); | |
_ -> | |
NewHealth = CurrentHealth | |
end, | |
City#city{health = NewHealth}. | |
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