export type CPAStage = "concrete" | "pictoric" | "abstract"

export interface CPAState {
  stage: CPAStage
  currentValue: number
  attempts: number
  mastered: boolean
}

/**
 * CPA (Concrete-Pictórico-Abstracto) progression engine.
 *
 * - Concrete: show objects (animated) for the child to count with finger.
 * - Pictoric: show images of objects, then hide them progressively.
 * - Abstract: show only the number symbol → child says/selects the quantity.
 */
export function getCPAProgression(skillValue: number): CPAStage[] {
  return ["concrete", "pictoric", "abstract"]
}

export function createCPAState(value: number): CPAState {
  return {
    stage: "concrete",
    currentValue: value,
    attempts: 0,
    mastered: false,
  }
}

export function advanceStage(state: CPAState): CPAState {
  const stages: CPAStage[] = ["concrete", "pictoric", "abstract"]
  const currentIdx = stages.indexOf(state.stage)
  if (currentIdx < stages.length - 1) {
    return { ...state, stage: stages[currentIdx + 1] }
  }
  return { ...state, mastered: true }
}