tabler/site/app/api/subscriptions/[id]/route.ts

import { NextResponse } from 'next/server'
import { getPlan } from '@/lib/data'
import LemonSqueezy from '@lemonsqueezy/lemonsqueezy.js'

const ls = new LemonSqueezy(process.env.LEMON_SQUEEZY_API_KEY as string)

export async function GET(_: Request, { params }: { params: { id: string } }) {
  /**
   * Used by some buttons to get subscription update billing and customer portal URLs
   */
  try {
    const subscription = await ls.getSubscription({ id: Number(params.id) })
    return NextResponse.json({ error: false, subscription: {
      update_billing_url: subscription['data']['attributes']['urls']['update_payment_method'],
      customer_portal_url: subscription['data']['attributes']['urls']['customer_portal']
    } }, { status: 200 })
  } catch (e) {
    return NextResponse.json({ error: true,  message: e.message }, { status: 400 })
  }
}

export async function POST(request: Request, { params }: { params: { id: string } }) {

  const res = await request.json()

  let subscription

  if (res.variantId && res.productId) {

    // Update plan

    try {
      subscription = await ls.updateSubscription({
        id: Number(params.id),
        productId: res.productId,
        variantId: res.variantId,
      })
    } catch (e) {
      return NextResponse.json({ error: true,  message: e.message }, { status: 400 })
    }

  } else if (res.action == 'resume') {

    // Resume
    
    try {
      subscription = await ls.resumeSubscription({ id: Number(params.id) })
    } catch (e) {
      return NextResponse.json({ error: true,  message: e.message }, { status: 400 })
    }

  } else if (res.action == 'cancel') {

    // Cancel

    try {
      subscription = await ls.cancelSubscription({ id: Number(params.id) })
    } catch (e) {
      return NextResponse.json({ error: true,  message: e.message }, { status: 400 })
    }

  } else if (res.action == 'pause') {

    // Pause

    try {
      subscription = await ls.pauseSubscription({ id: Number(params.id) })
    } catch (e) {
      return NextResponse.json({ error: true,  message: e.message }, { status: 400 })
    }

  } else if (res.action == 'unpause') {

    // Unpause

    try {
      subscription = await ls.unpauseSubscription({ id: Number(params.id) })
    } catch (e) {
      return NextResponse.json({ error: true,  message: e.message }, { status: 400 })
    }

  } else {

    // Missing data in request

    return NextResponse.json({ error: true,  message: 'Valid data not found.' }, { status: 400 })

  }

  // Return values needed to refresh state in UI
  // DB will be updated in the background with webhooks

  // Get price
  let resp = await ls.getPrice({ id: subscription['data']['attributes']['first_subscription_item']['price_id'] })
  let subItemPrice = resp['data']['attributes']['unit_price']

  // Return a filtered subscription object to the UI
  const sub = {
    product_id: subscription['data']['attributes']['product_id'],
    variant_id: subscription['data']['attributes']['variant_id'],
    status: subscription['data']['attributes']['status'],
    card_brand: subscription['data']['attributes']['card_brand'],
    card_last_four: subscription['data']['attributes']['card_last_four'],
    trial_ends_at: subscription['data']['attributes']['trial_ends_at'],
    renews_at: subscription['data']['attributes']['renews_at'],
    ends_at: subscription['data']['attributes']['ends_at'],
    resumes_at: subscription['data']['attributes']['resumes_at'],
    plan: {},
    price: subItemPrice,
  }

  // Get plan's data
  const plan = await getPlan(sub.variant_id)
  sub.plan = {
    interval: plan?.interval,
    name: plan?.variantName
  }

  return NextResponse.json({ error: false, subscription: sub }, { status: 200 })

}