import { NextApiRequest, NextApiResponse } from 'next'
import { methodNotAllowed } from '@typebot.io/lib/api'
import Stripe from 'stripe'
import Cors from 'micro-cors'
import { buffer } from 'micro'
import prisma from '@/lib/prisma'
import { Plan } from '@typebot.io/prisma'
import { RequestHandler } from 'next/dist/server/next'
import { sendTelemetryEvents } from '@typebot.io/lib/telemetry/sendTelemetryEvent'

if (!process.env.STRIPE_SECRET_KEY || !process.env.STRIPE_WEBHOOK_SECRET)
  throw new Error('STRIPE_SECRET_KEY or STRIPE_WEBHOOK_SECRET missing')
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY, {
  apiVersion: '2022-11-15',
})

const cors = Cors({
  allowMethods: ['POST', 'HEAD'],
})

const webhookSecret = process.env.STRIPE_WEBHOOK_SECRET as string

export const config = {
  api: {
    bodyParser: false,
  },
}

const webhookHandler = async (req: NextApiRequest, res: NextApiResponse) => {
  if (req.method === 'POST') {
    const buf = await buffer(req)
    const sig = req.headers['stripe-signature']

    if (!sig) return res.status(400).send(`stripe-signature is missing`)
    try {
      const event = stripe.webhooks.constructEvent(
        buf.toString(),
        sig.toString(),
        webhookSecret
      )
      switch (event.type) {
        case 'checkout.session.completed': {
          const session = event.data.object as Stripe.Checkout.Session
          const metadata = session.metadata as unknown as
            | {
                plan: 'STARTER' | 'PRO'
                additionalChats: string
                additionalStorage: string
                workspaceId: string
                userId: string
              }
            | { claimableCustomPlanId: string; userId: string }
          if ('plan' in metadata) {
            const {
              workspaceId,
              plan,
              additionalChats,
              additionalStorage,
              userId,
            } = metadata
            if (!workspaceId || !plan || !additionalChats || !additionalStorage)
              return res
                .status(500)
                .send({ message: `Couldn't retrieve valid metadata` })
            await prisma.workspace.update({
              where: { id: workspaceId },
              data: {
                plan,
                stripeId: session.customer as string,
                additionalChatsIndex: parseInt(additionalChats),
                additionalStorageIndex: parseInt(additionalStorage),
                chatsLimitFirstEmailSentAt: null,
                chatsLimitSecondEmailSentAt: null,
                storageLimitFirstEmailSentAt: null,
                storageLimitSecondEmailSentAt: null,
              },
            })

            await sendTelemetryEvents([
              {
                name: 'Subscription updated',
                workspaceId,
                userId,
                data: {
                  plan,
                  additionalChatsIndex: parseInt(additionalChats),
                  additionalStorageIndex: parseInt(additionalStorage),
                },
              },
            ])
          } else {
            const { claimableCustomPlanId, userId } = metadata
            if (!claimableCustomPlanId)
              return res
                .status(500)
                .send({ message: `Couldn't retrieve valid metadata` })
            const { workspaceId, chatsLimit, seatsLimit, storageLimit } =
              await prisma.claimableCustomPlan.update({
                where: { id: claimableCustomPlanId },
                data: { claimedAt: new Date() },
              })

            await prisma.workspace.update({
              where: { id: workspaceId },
              data: {
                plan: Plan.CUSTOM,
                stripeId: session.customer as string,
                customChatsLimit: chatsLimit,
                customStorageLimit: storageLimit,
                customSeatsLimit: seatsLimit,
              },
            })

            await sendTelemetryEvents([
              {
                name: 'Subscription updated',
                workspaceId,
                userId,
                data: {
                  plan: Plan.CUSTOM,
                  additionalChatsIndex: 0,
                  additionalStorageIndex: 0,
                },
              },
            ])
          }

          return res.status(200).send({ message: 'workspace upgraded in DB' })
        }
        case 'customer.subscription.deleted': {
          const subscription = event.data.object as Stripe.Subscription
          await prisma.workspace.update({
            where: {
              stripeId: subscription.customer as string,
            },
            data: {
              plan: Plan.FREE,
              additionalChatsIndex: 0,
              additionalStorageIndex: 0,
              chatsLimitFirstEmailSentAt: null,
              chatsLimitSecondEmailSentAt: null,
              storageLimitFirstEmailSentAt: null,
              storageLimitSecondEmailSentAt: null,
              customChatsLimit: null,
              customStorageLimit: null,
              customSeatsLimit: null,
            },
          })
          return res.send({ message: 'workspace downgraded in DB' })
        }
        default: {
          return res.status(304).send({ message: 'event not handled' })
        }
      }
    } catch (err) {
      console.error(err)
      if (err instanceof Error) {
        console.error(err)
        return res.status(400).send(`Webhook Error: ${err.message}`)
      }
      return res.status(500).send(`Error occured: ${err}`)
    }
  }
  return methodNotAllowed(res)
}

export default cors(webhookHandler as RequestHandler)