spacetac/src/core/ShipValue.ts

import { min, remove, sum } from "../common/Tools"

type ShipValuesMapping = {
  [P in (keyof ShipValues | keyof ShipAttributes)]: string
}

export const SHIP_VALUES_DESCRIPTIONS: ShipValuesMapping = {
  "initiative": "Capacity to play before others in a battle",
  "hull": "Physical structure of the ship",
  "shield": "Shield around the ship that may absorb damage",
  "power": "Power available to supply the equipments",
  "hull_capacity": "Maximal Hull value before the ship risks collapsing",
  "shield_capacity": "Maximal Shield value to protect the hull from damage",
  "power_capacity": "Maximal Power value to use equipment",
  "evasion": "Damage points that may be evaded by maneuvering",
}

export const SHIP_VALUES_NAMES: ShipValuesMapping = {
  "initiative": "initiative",
  "hull": "hull",
  "shield": "shield",
  "power": "power",
  "hull_capacity": "hull capacity",
  "shield_capacity": "shield capacity",
  "power_capacity": "power capacity",
  "evasion": "evasion",
}

/**
 * A ship attribute is a number resulting of a list of modifiers.
 */
export class ShipAttribute {
  // Current value
  private current = 0

  // Modifiers
  private cumulatives: number[] = []
  private multipliers: number[] = []
  private limits: number[] = []

  /**
   * Get the current value
   */
  get(): number {
    return this.current;
  }

  /**
   * Get the maximal value enforced by limit modifiers, Infinity for unlimited
   */
  getMaximal(): number {
    if (this.limits.length > 0) {
      return min(this.limits);
    } else {
      return Infinity;
    }
  }

  /**
   * Reset all modifiers
   */
  reset(): void {
    this.cumulatives = [];
    this.multipliers = [];
    this.limits = [];
    this.update();
  }

  /**
   * Add a modifier
   */
  addModifier(cumulative?: number, multiplier?: number, limit?: number): void {
    if (typeof cumulative != "undefined") {
      this.cumulatives.push(cumulative);
    }
    if (typeof multiplier != "undefined") {
      this.multipliers.push(multiplier);
    }
    if (typeof limit != "undefined") {
      this.limits.push(limit);
    }
    this.update();
  }

  /**
   * Remove a modifier
   */
  removeModifier(cumulative?: number, multiplier?: number, limit?: number): void {
    if (typeof cumulative != "undefined") {
      remove(this.cumulatives, cumulative);
    }
    if (typeof multiplier != "undefined") {
      remove(this.multipliers, multiplier);
    }
    if (typeof limit != "undefined") {
      remove(this.limits, limit);
    }
    this.update();
  }

  /**
   * Update the current value
   */
  private update(): void {
    let value = sum(this.cumulatives);
    if (this.multipliers.length) {
      value = Math.round(value * (1 + sum(this.multipliers) / 100));
    }
    if (this.limits.length) {
      value = Math.min(value, min(this.limits));
    }
    this.current = value;
  }
}

/**
 * Set of ShipAttribute for a ship
 */
export class ShipAttributes {
  // Initiative (capacity to play first)
  initiative = new ShipAttribute()
  // Maximal hull value
  hull_capacity = new ShipAttribute()
  // Maximal shield value
  shield_capacity = new ShipAttribute()
  // Damage evasion
  evasion = new ShipAttribute()
  // Maximal power value
  power_capacity = new ShipAttribute()
}

/**
 * Set of simple values for a ship
 */
export class ShipValues {
  hull = 0
  shield = 0
  power = 0
}

/**
 * Static attributes and values object for property queries
 */
export const SHIP_ATTRIBUTES = new ShipAttributes();
export const SHIP_VALUES = new ShipValues();

/**
 * Type guards
 */
export function isShipValue(key: string): key is keyof ShipValues {
  return SHIP_VALUES.hasOwnProperty(key);
}
export function isShipAttribute(key: string): key is keyof ShipAttributes {
  return SHIP_ATTRIBUTES.hasOwnProperty(key);
}