2021-03-09_behaviour-types.ts

// We need units to compare and some stats and status to check. 
// I will skill the imported 'Effect' and 'RaceName' types here
type UnitBase = {
    hp: {
        current: number;
        max: number;
    };
    status: Effect[];
};

export type Unit = UnitBase & {
    name: string;
    id: string;
    race: RaceName;
};


// possible selections for targeets and derived types
const targets = [
    "self",
    "currentAlly",
    "currentEnemy",
    "leader",
    "leaderCurrentEnemy",
    "leaderCurrentAlly"
] as const
type Target = typeof targets[number];

const conditionTargets = [
    ...targets,
    "ally",
    "enemy",
] as const
type ConditionTarget = typeof conditionTargets[number];

/*
 * skipped a few more types here including a selection of 
 * valid absolute numbers and percentage values as well as 
 * our previously used Effect type
 */

// comparison operators for numerical values like hitpoints
const comparisonOperators = ["lt", "lte", "eq", "gte", "gt"] as const
type ComparisonOperator = typeof comparisonOperators[number];

type PercentageComparison = [ComparisonOperator, Percentage];
type AbsoluteComparison = [ComparisonOperator, AbsoluteValue];
type StatusComparison = [boolean, Effect];

// last thing to do here is a simple mapping of valid combinations
type TargetComparison =
    | ["hp", AbsoluteComparison]
    | ["hp%", PercentageComparison]
    | ["mp", AbsoluteComparison]
    | ["mp%", PercentageComparison]
    | ["status", StatusComparison]
    
type TriggerCondition = [ConditionTarget, TargetComparison];

type Gambit = {
  target: ConditionTarget;
  comparison: TargetComparison;
  action: Spell | Skill | Item;
}