import type { Campaign } from "@b2bcall/database";

/**
 * Janela de funcionamento da campanha (agente.md secao 63-64: timezone,
 * days_of_week, start/end_date, start/end_time — status vira
 * WAITING_SCHEDULE quando fora da janela). Usa `Intl.DateTimeFormat` com
 * `timeZone` em vez de trazer uma lib de datas só pra isso — o Node já sabe
 * converter pra qualquer timezone IANA nativamente.
 */
export function isWithinSchedule(campaign: Campaign, now: Date = new Date()): boolean {
  const parts = new Intl.DateTimeFormat("en-US", {
    timeZone: campaign.timezone,
    year: "numeric",
    month: "2-digit",
    day: "2-digit",
    hour: "2-digit",
    minute: "2-digit",
    hour12: false,
    weekday: "short",
  }).formatToParts(now);

  const get = (type: string) => parts.find((p) => p.type === type)?.value ?? "";
  const dateStr = `${get("year")}-${get("month")}-${get("day")}`;
  const timeStr = `${get("hour")}:${get("minute")}`;
  const weekdayMap: Record<string, number> = { Mon: 1, Tue: 2, Wed: 3, Thu: 4, Fri: 5, Sat: 6, Sun: 7 };
  const isoWeekday = weekdayMap[get("weekday")];

  if (campaign.startDate) {
    const startStr = campaign.startDate.toISOString().slice(0, 10);
    if (dateStr < startStr) return false;
  }
  if (campaign.endDate) {
    const endStr = campaign.endDate.toISOString().slice(0, 10);
    if (dateStr > endStr) return false;
  }
  if (campaign.daysOfWeek.length > 0 && !campaign.daysOfWeek.includes(isoWeekday)) {
    return false;
  }
  if (campaign.startTime && timeStr < campaign.startTime) return false;
  if (campaign.endTime && timeStr > campaign.endTime) return false;

  return true;
}