import type { Stage } from "../types"

// Equivalences: 1/2 = 2/4 = 3/6, 1/3 = 2/6, 1/4 = 2/8
const equivalencias: { a: string; b: string; result: boolean }[] = [
  { a: "1/2", b: "2/4", result: true },
  { a: "1/2", b: "3/6", result: true },
  { a: "1/3", b: "2/6", result: true },
  { a: "1/4", b: "2/8", result: true },
  { a: "3/4", b: "6/8", result: true },
  { a: "2/3", b: "4/6", result: true },
  { a: "1/2", b: "2/3", result: false },
  { a: "1/3", b: "1/4", result: false },
  { a: "1/4", b: "1/2", result: false },
  { a: "3/4", b: "1/2", result: false },
  { a: "2/3", b: "3/4", result: false },
  { a: "1/2", b: "1/3", result: false },
  { a: "2/4", b: "3/6", result: true },
  { a: "1/3", b: "3/9", result: true },
  { a: "1/4", b: "3/12", result: true },
]

// Sumas y restas del mismo denominador
const opFracs: { numA: number; den: number; numB: number; op: "+" | "-"; resultado: string }[] = [
  { numA: 1, den: 4, numB: 2, op: "+", resultado: "3/4" },
  { numA: 2, den: 5, numB: 1, op: "+", resultado: "3/5" },
  { numA: 3, den: 8, numB: 2, op: "+", resultado: "5/8" },
  { numA: 1, den: 3, numB: 1, op: "+", resultado: "2/3" },
  { numA: 2, den: 7, numB: 3, op: "+", resultado: "5/7" },
  { numA: 3, den: 4, numB: 1, op: "-", resultado: "2/4" },
  { numA: 4, den: 5, numB: 1, op: "-", resultado: "3/5" },
  { numA: 5, den: 8, numB: 2, op: "-", resultado: "3/8" },
  { numA: 2, den: 3, numB: 1, op: "-", resultado: "1/3" },
  { numA: 6, den: 7, numB: 2, op: "-", resultado: "4/7" },
  { numA: 1, den: 6, numB: 2, op: "+", resultado: "3/6" },
  { numA: 3, den: 10, numB: 4, op: "+", resultado: "7/10" },
  { numA: 7, den: 9, numB: 2, op: "-", resultado: "5/9" },
  { numA: 5, den: 6, numB: 1, op: "-", resultado: "4/6" },
  { numA: 2, den: 9, numB: 5, op: "+", resultado: "7/9" },
]

const exercises: any[] = []
let idx = 0

// Part 1: equivalence recognition (conciencia)
for (const eq of equivalencias) {
  exercises.push({
    id: `seb7-frac-eq-${idx}`,
    stage: 7,
    skillCode: `frac-eq-${idx}`,
    type: "conciencia",
    prerequisites: idx === 0 ? [] : [exercises[idx - 1].id],
    content: {
      instruction: eq.result
        ? `¿${eq.a} es equivalente a ${eq.b}?`
        : `¿${eq.a} es equivalente a ${eq.b}?`,
      audioText: `${eq.a} es equivalente a ${eq.b}?`,
      emoji: "🥧",
      options: [
        { label: "Verdadero", correct: eq.result, id: `true-${idx}` },
        { label: "Falso", correct: !eq.result, id: `false-${idx}` },
      ],
    },
    functionalContext: "Reconocer equivalencias entre fracciones con círculos Montessori.",
    errorType: "confusion-letra",
  })
  idx++
}

// Part 2: addition/subtraction (eleccion)
for (const op of opFracs) {
  const wrong1 = `${op.numA + op.numB + 1}/${op.den}`
  const wrong2 = `${Math.abs(op.numA - op.numB + op.den)}/${op.den}`
  exercises.push({
    id: `seb7-frac-op-${idx}`,
    stage: 7,
    skillCode: `frac-op-${idx}`,
    type: "eleccion",
    prerequisites: [exercises[idx - 1].id],
    content: {
      instruction: `Resolvé: ${op.numA}/${op.den} ${op.op} ${op.numB}/${op.den}`,
      audioText: `${op.numA} ${op.op === "+" ? "más" : "menos"} ${op.numB}, sobre ${op.den}`,
      emoji: "🧮",
      options: [
        { label: op.resultado, correct: true, id: `c-${idx}` },
        { label: wrong1, correct: false, id: `w1-${idx}` },
        { label: wrong2, correct: false, id: `w2-${idx}` },
      ].sort(() => Math.random() - 0.5),
    },
    functionalContext: "Sumar y restar fracciones con el mismo denominador usando círculos Montessori.",
    errorType: "confusion-letra",
  })
  idx++
}

const stage: Stage = {
  id: 7,
  name: "Fracciones: equivalencias y operaciones",
  description: "Reconocer fracciones equivalentes y sumar/restar fracciones con el mismo denominador.",
  exercises,
}

export default stage