import type { WorkOrderTableRow } from "@/domain/work-orders/types/work-order-table-row";

const SERVICE_PHRASE: Record<string, string> = {
  "Scrubber Pit": "Scrubber Pit Augering",
  "Backflow Preventers": "Backflow Preventer Testing",
  "Domestic Backflow": "Domestic Backflow Testing",
  "Tank / Water Heater": "Tank / Water Heater Inspection",
  "Pressure Reducing Valve": "Pressure Reducing Valve Service",
  "Pumping Systems": "Pumping System Maintenance",
  "HVAC Inspection": "HVAC Inspection",
  Electrical: "Electrical Inspection",
  Plumbing: "Plumbing Service",
  "Door / Hardware": "Door / Hardware Service",
  "Floor Drain Backing Up": "Floor Drain Augering",
  "Parking Lot Lighting": "Parking Lot Lighting Service",
  "Mens Restroom Camera Line": "Restroom Camera Line Service",
  "Assess Window Leaks": "Window Leak Assessment",
};

const FREQ_CYCLE = ["13 Week", "26 Week", "52 Week"];

function hashNum(s: string, mod: number): number {
  let h = 0;
  for (let i = 0; i < s.length; i++) h = (h * 31 + s.charCodeAt(i)) >>> 0;
  return h % mod;
}

export function serviceTitle(row: Pick<WorkOrderTableRow, "pm" | "woNumber">): string {
  const phrase = SERVICE_PHRASE[row.pm] ?? row.pm;
  return `Amer-Building ${phrase} — ${FREQ_CYCLE[hashNum(row.woNumber, FREQ_CYCLE.length)]}`;
}