/* The plan reminders: the emails a room gets as its trial or paid period runs down.
 *
 *   node scripts/plan-reminders.cjs            # send what is due today
 *   node scripts/plan-reminders.cjs --dry-run  # say what would be sent, send nothing
 *
 * Runs on the production box with its .env (DATABASE_URL, SMTP_*) — daily at 08:10 Brisbane from
 * scripts/systemd/threadcount-plan-reminders.timer:
 *
 *   sudo install -m 644 scripts/systemd/threadcount-plan-reminders.service /etc/systemd/system/
 *   sudo install -m 644 scripts/systemd/threadcount-plan-reminders.timer   /etc/systemd/system/
 *   sudo systemctl daemon-reload && sudo systemctl enable --now threadcount-plan-reminders.timer
 *
 * What it sends, and to whom lib/billing-mail.ts would (the billing contact, else every active
 * admin; never a staff account):
 *   - trial-d1/3/7/21/28: the five trial notes, by days since the trial began (register, counter
 *     app, reports, what a plan includes, two days left); each in a three-day window so a missed
 *     run still sends it, and never after the trial has ended;
 *   - trial7 / trial1: a trial ending within 7 days, then within 1 day;
 *   - ended:  a trial or paid period that ended in the last day — the fortnight's grace starts;
 *   - readonly: grace that ran out in the last day — the room is read-only.
 * Each is sent once per facility per period end: PlanMail rows keyed "kind:YYYY-MM-DD" are written
 * before sending, so a crash or a retry never repeats a mail. Grandfathered rooms, the demo, rooms
 * that pay by card (Stripe's own events cover them) and health-service members are skipped. */
require("dotenv/config");
const nodemailer = require("nodemailer");
const { PrismaClient } = require("@prisma/client");
const { PrismaPg } = require("@prisma/adapter-pg");
const T = require("../lib/billing-mail.cjs");

const DRY = process.argv.includes("--dry-run");
const DAY = 86_400_000;
const GRACE_DAYS = 14;
const TRIAL_DAYS = 30; // lib/plan.ts
const TRIAL_TIPS = [1, 3, 7, 21, 28];
const MONTHLY_CENTS = 12900, ANNUAL_CENTS = 129000; // PRICES in lib/plan.ts, ex tax

const prisma = new PrismaClient({ adapter: new PrismaPg({ connectionString: process.env.DATABASE_URL, max: 1 }) });

function transport() {
  const port = parseInt(process.env.SMTP_PORT || "587", 10);
  return nodemailer.createTransport({ host: process.env.SMTP_HOST, port, secure: port === 465, auth: { user: process.env.SMTP_USER, pass: process.env.SMTP_PASS } });
}

async function recipients(f) {
  const contact = (f.billingEmail || "").trim().toLowerCase();
  if (contact) return { to: [contact], ctx: { facility: f.name, contact } };
  const admins = await prisma.user.findMany({ where: { facilityId: f.id, role: "ADMIN", inactive: false }, select: { email: true } });
  return { to: admins.map((a) => a.email.toLowerCase()), ctx: { facility: f.name, contact: "" } };
}

const day = (d) => d.toISOString().slice(0, 10);

async function main() {
  if (!process.env.DATABASE_URL) throw new Error("DATABASE_URL is not set");
  if (!DRY && !(process.env.SMTP_HOST && process.env.SMTP_USER && process.env.SMTP_PASS)) throw new Error("SMTP_* is not set");
  const now = new Date();
  const rooms = await prisma.facility.findMany({
    where: { isDemo: false, grandfathered: false, orgId: null, stripeSubscriptionId: "", planStatus: { in: ["trial", "active"] } },
    select: { id: true, name: true, billingEmail: true, planStatus: true, trialEndsAt: true, paidUntil: true },
  });
  const due = [];
  for (const f of rooms) {
    const endsAt = f.planStatus === "trial" ? f.trialEndsAt : f.paidUntil;
    if (!endsAt) continue;
    const graceEndsAt = new Date(endsAt.getTime() + GRACE_DAYS * DAY);
    const daysToEnd = Math.ceil((endsAt.getTime() - now.getTime()) / DAY);
    const wasTrial = f.planStatus === "trial";
    const base = { endsAt, graceEndsAt, monthlyCents: MONTHLY_CENTS, annualCents: ANNUAL_CENTS, wasTrial };
    if (wasTrial && now < endsAt) {
      const age = Math.floor((now.getTime() - (endsAt.getTime() - TRIAL_DAYS * DAY)) / DAY);
      const tip = TRIAL_TIPS.find((d) => age >= d && age < d + 3);
      if (tip) due.push({ f, kind: `trial-d${tip}:${day(endsAt)}`, render: (ctx) => T.trialTip(ctx, { ...base, day: tip }) });
    }
    if (wasTrial && daysToEnd <= 7 && daysToEnd > 1) due.push({ f, kind: `trial7:${day(endsAt)}`, render: (ctx) => T.trialEndingSoon(ctx, { ...base, daysLeft: daysToEnd }) });
    else if (wasTrial && daysToEnd === 1) due.push({ f, kind: `trial1:${day(endsAt)}`, render: (ctx) => T.trialEndingSoon(ctx, { ...base, daysLeft: 1 }) });
    if (now >= endsAt && now < new Date(endsAt.getTime() + DAY) && wasTrial) due.push({ f, kind: `ended:${day(endsAt)}`, render: (ctx) => T.trialEnded(ctx, base) });
    if (now >= graceEndsAt && now < new Date(graceEndsAt.getTime() + DAY)) due.push({ f, kind: `readonly:${day(endsAt)}`, render: (ctx) => T.readOnlyNow(ctx, base) });
  }
  let sent = 0, skipped = 0;
  const t = DRY ? null : transport();
  for (const d of due) {
    const already = await prisma.planMail.findUnique({ where: { facilityId_kind: { facilityId: d.f.id, kind: d.kind } } });
    if (already) { skipped++; continue; }
    const { to, ctx } = await recipients(d.f);
    if (!to.length) { console.log(`no recipient for ${d.f.name} (${d.kind})`); continue; }
    const m = d.render(ctx);
    if (DRY) { console.log(`would send ${d.kind} to ${to.join(", ")}: ${m.subject}`); continue; }
    await prisma.planMail.create({ data: { facilityId: d.f.id, kind: d.kind } });
    for (const a of to) await t.sendMail({ from: process.env.SMTP_FROM || process.env.SMTP_USER, to: a, subject: m.subject, text: m.text, html: m.html });
    sent++;
    console.log(`sent ${d.kind} to ${to.length} address(es) for ${d.f.name}`);
  }
  console.log(`${DRY ? "dry run: " : ""}${due.length} due, ${sent} sent, ${skipped} already sent`);
}

main().catch((e) => { console.error(e.message); process.exit(1); }).finally(() => prisma.$disconnect());