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

export type GalperinStage = "hand" | "external_speech" | "inner_speech" | "mental" | "mastered"

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

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,
    galperinStage: "hand",
  }
}

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], galperinStage: "hand" }
  }
  return { ...state, mastered: true }
}

export function advanceGalperin(stage: GalperinStage): GalperinStage {
  const order: GalperinStage[] = ["hand", "external_speech", "inner_speech", "mental", "mastered"]
  const idx = order.indexOf(stage)
  if (idx < order.length - 1) return order[idx + 1]
  return "mastered"
}

export function getGalperinInstruction(stage: GalperinStage, value: number): string {
  switch (stage) {
    case "hand":
      return `Tocá ${value} cosas con tu dedo`
    case "external_speech":
      return "Contá en voz alta mientras tocás"
    case "inner_speech":
      return "Ahora contá susurrando"
    case "mental":
      return "Pensá el número en tu cabeza y señalalo"
    case "mastered":
      return "¡Ya sabés este número!"
  }
}