import type { Exercise, Stage, TopicCurriculum } from "./types"

const lecturaModules: Record<string, Stage> = {}
const numerosModules: Record<string, Stage> = {}

async function loadStages(
  topic: string,
  modules: Record<string, Stage>,
  stageFiles: number[],
) {
  for (const s of stageFiles) {
    try {
      const mod = await import(`./${topic}/etapa-${s}`)
      modules[s] = mod.default
    } catch {
      // stage not yet implemented
    }
  }
}

let lecturaLoaded = false
let numerosLoaded = false

export function getAllLecturaExercises(): Exercise[] {
  const stages = Object.values(getLecturaStages())
  return stages.flatMap((s) => s.exercises || [])
}

export function getLecturaStages(): Record<string, Stage> {
  return lecturaModules as Record<string, Stage>
}

export function getNumerosStages(): Record<string, Stage> {
  return numerosModules as Record<string, Stage>
}

export async function initCurriculum() {
  if (!lecturaLoaded) {
    await loadStages("lectura", lecturaModules, [1, 2, 3, 4, 5, 6, 7, 8, 9])
    lecturaLoaded = true
  }
  if (!numerosLoaded) {
    await loadStages("numeros", numerosModules, [1, 2, 3, 4, 5, 6, 7, 8])
    numerosLoaded = true
  }
}