"use server";

import { revalidatePath } from "next/cache";
import { getServerSession } from "@/lib/auth/guards";
import { prisma } from "@/lib/db";
import {
  stripe,
  createStripeCheckout,
  createStripePortal,
  isStripeConfigured,
} from "@/lib/billing/stripe";
import {
  createPaypalSubscription,
  cancelPaypalSubscription,
  isPaypalConfigured,
} from "@/lib/billing/paypal";
import { paypalPlanId, type BillingInterval } from "@/lib/billing/catalog";
import { getActiveSubscription } from "@/lib/billing/subscription";
import type { PlanKey } from "@/lib/billing/plans";

type ActionResult = { ok: true; url?: string } | { ok: false; error: string };

function errMsg(e: unknown): string {
  return e instanceof Error ? e.message : "Something went wrong";
}

export async function startStripeCheckoutAction(
  plan: PlanKey,
  interval: BillingInterval
): Promise<ActionResult> {
  const session = await getServerSession();
  if (!session) return { ok: false, error: "Please sign in." };
  if (!isStripeConfigured()) return { ok: false, error: "Card payments aren't configured yet." };

  const user = await prisma.user.findUnique({
    where: { id: session.user.id },
    select: { id: true, email: true, name: true, stripeCustomerId: true },
  });
  if (!user) return { ok: false, error: "Account not found." };

  try {
    const url = await createStripeCheckout({
      user,
      plan,
      interval,
      subjectId: user.id,
      subjectType: "user",
    });
    return { ok: true, url };
  } catch (e) {
    return { ok: false, error: errMsg(e) };
  }
}

export async function startPaypalCheckoutAction(plan: PlanKey): Promise<ActionResult> {
  const session = await getServerSession();
  if (!session) return { ok: false, error: "Please sign in." };
  if (!isPaypalConfigured()) return { ok: false, error: "PayPal isn't configured yet." };

  const planId = paypalPlanId(plan);
  if (!planId) return { ok: false, error: "PayPal plan isn't configured for this tier." };

  try {
    const { approveUrl } = await createPaypalSubscription({
      planId,
      custom: { subjectId: session.user.id, subjectType: "user", plan },
    });
    return { ok: true, url: approveUrl };
  } catch (e) {
    return { ok: false, error: errMsg(e) };
  }
}

export async function openStripePortalAction(): Promise<ActionResult> {
  const session = await getServerSession();
  if (!session) return { ok: false, error: "Please sign in." };
  const user = await prisma.user.findUnique({
    where: { id: session.user.id },
    select: { stripeCustomerId: true },
  });
  if (!user?.stripeCustomerId) return { ok: false, error: "No billing account yet." };
  try {
    const url = await createStripePortal(user.stripeCustomerId);
    return { ok: true, url };
  } catch (e) {
    return { ok: false, error: errMsg(e) };
  }
}

export async function cancelSubscriptionAction(): Promise<ActionResult> {
  const session = await getServerSession();
  if (!session) return { ok: false, error: "Please sign in." };
  const sub = await getActiveSubscription(session.user.id);
  if (!sub) return { ok: false, error: "No active subscription." };

  try {
    if (sub.provider === "paypal" && sub.paypalSubscriptionId) {
      await cancelPaypalSubscription(sub.paypalSubscriptionId);
      await prisma.subscription.update({
        where: { id: sub.id },
        data: { status: "canceled", cancelAtPeriodEnd: true },
      });
    } else if (sub.provider === "stripe" && sub.stripeSubscriptionId) {
      await stripe().subscriptions.update(sub.stripeSubscriptionId, { cancel_at_period_end: true });
      await prisma.subscription.update({
        where: { id: sub.id },
        data: { cancelAtPeriodEnd: true },
      });
    }
    revalidatePath("/billing");
    return { ok: true };
  } catch (e) {
    return { ok: false, error: errMsg(e) };
  }
}