// server/lib/scheduling.test.ts
//
// La suite corre con TZ=UTC A PROPÓSITO, y los casos usan negocios en
// America/Mexico_City: la tz del proceso y la del negocio nunca coinciden, así que
// cualquier cálculo que se ancle a la del proceso falla aquí y no en producción.
// (Se fija en runtime en vez de en el script de npm porque `TZ=x cmd` no es
// portable a cmd.exe en Windows.)
process.env.TZ = "UTC";

import { test } from "node:test";
import assert from "node:assert/strict";
import {
  parseWorkingHours, isoDayOfWeek, getWorkingHoursForDate,
  normalizeText, tokens, specialtyMatch, overlaps, hasConflict, scoreCandidate,
  pickBestSlotEmployee, BUSY_STATUSES,
} from "./scheduling.ts";
import type { CandidateInfo, BusyWindow } from "./scheduling.ts";

const MX = "America/Mexico_City";
/** Instante UTC de un reloj de pared mexicano. Los tests no deben depender de la tz del proceso. */
function mx(dateIso: string, hh: number, mm = 0): number {
  const [y, mo, d] = dateIso.split("-").map(Number);
  return Date.UTC(y, mo - 1, d, hh + 6, mm); // México = UTC-6 todo el año desde 2022
}

test("parseWorkingHours: json válido → mapa 1..7", () => {
  const m = parseWorkingHours(JSON.stringify({ 1: { start: "09:00", end: "20:00" }, 6: null, 7: null }));
  assert.equal(m?.[1]?.start, "09:00");
  assert.equal(m?.[6], null);
  assert.equal(m?.[7], null);
  assert.equal(m?.[2], null); // ausente → null
});

test("parseWorkingHours: null/invalid → null", () => {
  assert.equal(parseWorkingHours(null), null);
  assert.equal(parseWorkingHours("no-json"), null);
});

test("isoDayOfWeek: lunes=1, domingo=7", () => {
  assert.equal(isoDayOfWeek(new Date("2026-07-27T12:00:00")), 1); // lunes
  assert.equal(isoDayOfWeek(new Date("2026-07-26T12:00:00")), 7); // domingo
});

test("getWorkingHoursForDate: día cerrado → null", () => {
  const biz = parseWorkingHours(JSON.stringify({ 6: null, 7: null })); // fin de semana cerrado
  assert.equal(getWorkingHoursForDate(null, biz, "2026-07-25", MX), null); // sábado
});

test("normalizeText/tokens: quita acentos y lowercase", () => {
  assert.equal(normalizeText("Coloración"), "coloracion");
  assert.deepEqual(tokens("Corte de cabello"), ["corte", "de", "cabello"]);
});

test("specialtyMatch: coincidencia exacta de etiqueta → 1", () => {
  assert.equal(specialtyMatch(["corte"], { name: "Corte de cabello", category: "Cabello" }), 1);
});

test("specialtyMatch: etiqueta con acento/case → 1", () => {
  assert.equal(specialtyMatch(["Coloración"], { name: "Tinte", category: "Coloración" }), 1);
});

test("specialtyMatch: sin etiquetas → 0.5", () => {
  assert.equal(specialtyMatch([], { name: "Corte", category: "Cabello" }), 0.5);
});

test("specialtyMatch: etiqueta no relacionada → 0.5", () => {
  assert.equal(specialtyMatch(["barba"], { name: "Manicura", category: "Uñas" }), 0.5);
});

test("overlaps: bordes inclusivos de no-traslape", () => {
  // una cita termina exactamente cuando empieza otra → NO traslape
  assert.equal(overlaps(100, 200, 200, 300), false);
  // traslape real
  assert.equal(overlaps(100, 250, 200, 300), true);
  assert.equal(overlaps(200, 300, 100, 250), true);
});

test("hasConflict: lista vacía → false", () => {
  assert.equal(hasConflict([], 100, 200), false);
});

test("scoreCandidate: pesos 40/20/40", () => {
  // todo al máximo → 100
  assert.equal(scoreCandidate({ specialtyMatch: 1, efficiency: 1, loadBalance: 0 }), 100);
  // todo al mínimo → 0
  assert.equal(scoreCandidate({ specialtyMatch: 0, efficiency: 0, loadBalance: 1 }), 0);
  // sólo specialty (0.5) → 20 (40·0.5)
  assert.equal(scoreCandidate({ specialtyMatch: 0.5, efficiency: 0, loadBalance: 1 }), 20);
});

test("scoreCandidate: mayor efficiency → mayor score", () => {
  const low = scoreCandidate({ specialtyMatch: 0.5, efficiency: 0.2, loadBalance: 0.5 });
  const high = scoreCandidate({ specialtyMatch: 0.5, efficiency: 0.9, loadBalance: 0.5 });
  assert.ok(high > low);
});

test("scoreCandidate: menor load (más disponible) → mayor score", () => {
  const busy = scoreCandidate({ specialtyMatch: 0.5, efficiency: 0.5, loadBalance: 0.9 });
  const free = scoreCandidate({ specialtyMatch: 0.5, efficiency: 0.5, loadBalance: 0.1 });
  assert.ok(free > busy);
});

test("scoreCandidate: fairness — libre+ineficiente vence a ocupado+eficiente (misma especialidad)", () => {
  // Con los pesos viejos (50/30/20) el efficiency estático (30) aplastaba al load (20):
  // un senior ocupado siempre ganaba. Con 40/20/40, el load (40) supera al efficiency (20).
  // A: especialista ocupado (load 0.8) y muy eficiente (0.9)
  const a = scoreCandidate({ specialtyMatch: 0.5, efficiency: 0.9, loadBalance: 0.8 });
  // B: especialista libre (load 0.1) e ineficiente (0.2)
  const b = scoreCandidate({ specialtyMatch: 0.5, efficiency: 0.2, loadBalance: 0.1 });
  assert.equal(a, 40 * 0.5 + 20 * 0.9 + 40 * (1 - 0.8)); // 46
  assert.equal(b, 40 * 0.5 + 20 * 0.2 + 40 * (1 - 0.1)); // 60
  assert.ok(b > a, "el especialista libre debe vencer al ocupado+eficiente (anti-burnout)");
});

test("pickBestSlotEmployee: empate en score → gana el de menor loadBalance (no por id)", () => {
  const bizWh = parseWorkingHours(JSON.stringify({ 1: { start: "09:00", end: "17:00" } }));
  const startMs = mx("2026-07-27", 13); // lunes, dentro de horario
  const endMs = mx("2026-07-27", 14);
  // A (id menor, senior): especialidad coincide (sm=1), ocupado media jornada (load=0.5)
  //   → 40·1 + 20·0.5 + 40·0.5 = 70
  // B (id mayor, junior): sin especialidad (sm=0.5), libre (load=0)
  //   → 40·0.5 + 20·0.5 + 40·1 = 70  → empate exacto; menor load gana
  const A: CandidateInfo = { id: 1, name: "Senior", color: "#fff", role: "stylist", specialties: ["corte"], efficiency_score: 50, empWh: null };
  const B: CandidateInfo = { id: 2, name: "Junior", color: "#fff", role: "stylist", specialties: [], efficiency_score: 50, empWh: null };
  const busy = new Map<number, BusyWindow[]>([
    [1, [{ startMs: mx("2026-07-27", 9), endMs: mx("2026-07-27", 13) }]],
    [2, []],
  ]);
  const best = pickBestSlotEmployee([A, B], busy, bizWh, { name: "Corte", category: "Cabello" }, startMs, endMs, MX);
  assert.equal(best?.id, 2, "el junior libre gana el empate por menor loadBalance, NO por id menor");
});

test("pickBestSlotEmployee: empate total (score+load) → decisión determinista y reproducible", () => {
  const bizWh = parseWorkingHours(JSON.stringify({ 1: { start: "09:00", end: "17:00" } }));
  const startMs = mx("2026-07-27", 9);
  const endMs = mx("2026-07-27", 10);
  // Dos candidatos idénticos salvo el id → mismo score y mismo loadBalance → hash decide.
  const A: CandidateInfo = { id: 10, name: "Diez", color: "#fff", role: "s", specialties: ["corte"], efficiency_score: 50, empWh: null };
  const B: CandidateInfo = { id: 20, name: "Veinte", color: "#fff", role: "s", specialties: ["corte"], efficiency_score: 50, empWh: null };
  const busy = new Map<number, BusyWindow[]>([[10, []], [20, []]]);
  const r1 = pickBestSlotEmployee([A, B], busy, bizWh, { name: "Corte", category: "Cabello" }, startMs, endMs, MX);
  const r2 = pickBestSlotEmployee([A, B], busy, bizWh, { name: "Corte", category: "Cabello" }, startMs, endMs, MX);
  assert.ok(r1 && (r1.id === 10 || r1.id === 20), "debe elegir uno de los dos candidatos");
  assert.equal(r1?.id, r2?.id, "misma entrada → misma decisión (hash determinista, reproducible)");
});

test("BUSY_STATUSES: scheduled+completed sí cuentan; no_show NO (silla vacía)", () => {
  const s: string[] = [...BUSY_STATUSES];
  assert.ok(s.includes("scheduled"));
  assert.ok(s.includes("completed"));
  assert.equal(s.includes("no_show"), false);
  assert.equal(s.length, 2);
});

// ── Regresión: la ventana laboral debe anclarse a la tz del NEGOCIO ────────────
// Estos tests fallaban en producción (contenedor node:22-slim = UTC) y pasaban en
// dev (Windows = America/Mexico_City), porque getWorkingHoursForDate construía la
// ventana con `new Date(y, m, d, hh, mm)`, es decir en la tz del *proceso*.
// Corren bajo `TZ=UTC` en test:unit precisamente para que el desfase no se esconda.

test("getWorkingHoursForDate: ancla la ventana a la tz del negocio, no a la del proceso", () => {
  const biz = parseWorkingHours(JSON.stringify({ 1: { start: "09:00", end: "20:00" } }));
  const r = getWorkingHoursForDate(null, biz, "2026-08-31", "America/Mexico_City"); // lunes
  assert.ok(r, "el lunes debe estar abierto");
  // 09:00 CST = 15:00Z ; 20:00 CST = 02:00Z del día siguiente
  assert.equal(new Date(r!.startMs).toISOString(), "2026-08-31T15:00:00.000Z");
  assert.equal(new Date(r!.endMs).toISOString(), "2026-09-01T02:00:00.000Z");
});

test("getWorkingHoursForDate: la misma fecha en otra tz da otra ventana absoluta", () => {
  const biz = parseWorkingHours(JSON.stringify({ 1: { start: "09:00", end: "20:00" } }));
  const mx = getWorkingHoursForDate(null, biz, "2026-08-31", "America/Mexico_City");
  const utc = getWorkingHoursForDate(null, biz, "2026-08-31", "UTC");
  assert.notEqual(mx!.startMs, utc!.startMs);
  assert.equal(new Date(utc!.startMs).toISOString(), "2026-08-31T09:00:00.000Z");
});

test("getWorkingHoursForDate: el día de la semana sale de la fecha natural, no de un Date local", () => {
  const biz = parseWorkingHours(JSON.stringify({ 6: null, 7: null, 1: { start: "09:00", end: "20:00" } }));
  assert.equal(getWorkingHoursForDate(null, biz, "2026-08-29", "America/Mexico_City"), null); // sábado
  assert.equal(getWorkingHoursForDate(null, biz, "2026-08-30", "America/Mexico_City"), null); // domingo
  assert.ok(getWorkingHoursForDate(null, biz, "2026-08-31", "America/Mexico_City"));          // lunes
});

test("getWorkingHoursForDate: empleado tiene prioridad sobre negocio (tz-explícito)", () => {
  const emp = parseWorkingHours(JSON.stringify({ 1: { start: "10:00", end: "14:00" } }));
  const biz = parseWorkingHours(JSON.stringify({ 1: { start: "09:00", end: "20:00" } }));
  const r = getWorkingHoursForDate(emp, biz, "2026-08-31", "America/Mexico_City");
  assert.equal(new Date(r!.startMs).toISOString(), "2026-08-31T16:00:00.000Z"); // 10:00 CST
});

test("pickBestSlotEmployee: un slot de la tarde del negocio sigue dentro de la ventana", () => {
  // 19:00 México = 01:00Z del día siguiente. Con la ventana mal anclada este slot
  // quedaba fuera de rango y el endpoint devolvía la tarde vacía.
  const bizWh = parseWorkingHours(JSON.stringify({ 1: { start: "09:00", end: "20:00" } }));
  const cand: CandidateInfo = {
    id: 1, name: "Ana", color: "#000", role: "Estilista",
    specialties: ["Cabello"], efficiency_score: 80, empWh: null,
  };
  const startMs = Date.parse("2026-09-01T01:00:00Z"); // lunes 31/08 19:00 México
  const endMs = startMs + 60 * 60000;
  const busy = new Map<number, BusyWindow[]>();
  const best = pickBestSlotEmployee(
    [cand], busy, bizWh, { name: "Corte", category: "Cabello" },
    startMs, endMs, "America/Mexico_City"
  );
  assert.equal(best?.id, 1);
});