// continuity/follow-up.ts
// Follow up on quotes that go quiet. Email only; stop on reply.
import { sendEmail } from './mail';
import { daysSince } from './dates';

const CADENCE = [3, 7, 14]; // days after the quote goes out

export function nextFollowUp(quote: Quote): number | null {
  if (quote.repliedAt) return null;         // they answered: stop
  const sent = quote.followUps.length;
  if (sent >= CADENCE.length) return null;  // asked enough
  const due = CADENCE[sent];
  return daysSince(quote.sentAt) >= due ? due : null;
}

export async function runFollowUps(quotes: Quote[]) {
  for (const quote of quotes) {
    const day = nextFollowUp(quote);
    if (day === null) continue;

    await sendEmail({
      to: quote.customer.email,
      subject: `Checking in on your ${quote.project} quote`,
      body: draftFollowUp(quote, day),
    });
    quote.followUps.push({ day, sentAt: new Date() });
  }
}

// continuity/pay-application.ts
// Tracks the numbers. Never touches the money.
export function payApplication(job: Job): PayApp {
  const contractSum = job.contract + sum(job.changeOrders);
  const completed = round(contractSum * job.percentComplete);
  const retainage = round(completed * job.retainageRate);
  const earned = completed - retainage;
  const currentDue = round(earned - job.previouslyBilled);

  return {
    contractSum,
    completed,
    retainage,
    earned,
    currentDue: Math.max(0, currentDue),
  };
}

function round(n: number): number {
  return Math.round(n * 100) / 100;
}

function sum(values: number[]): number {
  return values.reduce((total, v) => total + v, 0);
}