Trial emails driven by usage, not days remaining

import { days } from "@hogsend/core";
import { defineJourney, sendEmail } from "@hogsend/engine";

export const trialConversion = defineJourney({
  meta: {
    id: "trial-conversion",
    name: "Trial conversion",
    enabled: true,
    trigger: { event: "trial.started" },
    entryLimit: "once",
    exitOn: [
      // The built-in Stripe preset feeds this in — the journey is
      // cancelled the moment they pay, even mid-wait.
      { event: "subscription.created" },
      { event: "user.deleted" },
    ],
  },

  run: async (user, ctx) => {
    await ctx.sleep({ duration: days(3), label: "usage-check" });

    const { found: hitMilestone } = await ctx.history.hasEvent({
      userId: user.id,
      event: "usage.milestone_reached",
    });

    if (hitMilestone) {
      // The upgrade ask, at the moment of value — not the deadline.
      await sendEmail({
        to: user.email,
        userId: user.id,
        journeyStateId: user.stateId,
        template: "conversion-usage-milestone",
        subject: "You're on a roll — here's what the paid plan unlocks",
        journeyName: user.journeyName,
      });
    }

    await ctx.sleep({ duration: days(7), label: "trial-ending" });

    await sendEmail({
      to: user.email,
      userId: user.id,
      journeyStateId: user.stateId,
      template: "conversion-trial-expiring",
      subject: "Your trial ends in 3 days — don't lose your progress",
      journeyName: user.journeyName,
    });
  },
});