import Member from '../../models/member.js'
import Series from '../../models/series.js'
import { loadPublicEvent } from '../../utils/loadEvent.js'
import { calculateTicketPrice, calculateSeriesTicketPrice, hasMemberAccess } from '../../utils/tickets.js'
import { requireAuth, getOptionalMember, getPaymentBridgeMember } from '../../utils/auth.js'
import { initializeHelcimPaySession } from '../../utils/helcim.js'

export default defineEventHandler(async (event) => {
  try {
    const body = await validateBody(event, helcimInitializePaymentSchema)
    const metaType = body.metadata?.type

    const isEventTicket = metaType === 'event_ticket'
    const isSeriesTicket = metaType === 'series_ticket'
    const isTicket = isEventTicket || isSeriesTicket
    const isMembershipSignup = metaType === 'membership_signup'

    if (!isTicket) {
      if (isMembershipSignup) {
        const bridgeMember = await getPaymentBridgeMember(event)
        if (!bridgeMember) {
          await requireAuth(event)
        }
      } else {
        await requireAuth(event)
      }
    }

    let amount = 0
    let description = body.metadata?.eventTitle

    if (isTicket) {
      // Re-derive price server-side; never trust body.amount for ticket flows.
      const caller = await getOptionalMember(event).catch(() => null)
      const lookupEmail = body.metadata?.email?.toLowerCase()
      const member = caller || (lookupEmail
        ? await Member.findOne({ email: lookupEmail })
        : null)
      const accessMember = hasMemberAccess(member) ? member : null

      if (isEventTicket) {
        const eventId = body.metadata?.eventId
        if (!eventId) {
          throw createError({ statusCode: 400, statusMessage: 'metadata.eventId is required for event_ticket' })
        }
        const eventDoc = await loadPublicEvent(event, eventId)
        const ticketInfo = calculateTicketPrice(eventDoc, accessMember)
        if (!ticketInfo) {
          throw createError({ statusCode: 403, statusMessage: 'No tickets available for your membership status' })
        }
        amount = ticketInfo.price
        description = description || eventDoc.title
      } else {
        const seriesId = body.metadata?.seriesId
        if (!seriesId) {
          throw createError({ statusCode: 400, statusMessage: 'metadata.seriesId is required for series_ticket' })
        }
        const isObjectId = /^[0-9a-fA-F]{24}$/.test(seriesId)
        const seriesQuery = isObjectId
          ? { $or: [{ _id: seriesId }, { id: seriesId }, { slug: seriesId }] }
          : { $or: [{ id: seriesId }, { slug: seriesId }] }
        const series = await Series.findOne(seriesQuery)
        if (!series) {
          throw createError({ statusCode: 404, statusMessage: 'Series not found' })
        }
        const ticketInfo = calculateSeriesTicketPrice(series, accessMember)
        if (!ticketInfo) {
          throw createError({ statusCode: 403, statusMessage: 'No series passes available for your membership status' })
        }
        amount = ticketInfo.price
        description = description || series.title
      }
    } else {
      amount = body.amount || 0
    }

    const paymentType = isTicket && amount > 0 ? 'purchase' : 'verify'
    const requestBody = {
      paymentType,
      amount: paymentType === 'purchase' ? amount : 0,
      currency: 'CAD',
      paymentMethod: 'cc'
    }

    if (body.customerCode && paymentType === 'verify') {
      requestBody.customerCode = body.customerCode
    }

    if (description) {
      requestBody.description = description
      requestBody.notes = description
      const orderId = body.metadata?.eventId || body.metadata?.seriesId
      if (orderId) requestBody.orderNumber = `${orderId}`
    }

    const paymentData = await initializeHelcimPaySession(requestBody)

    return {
      success: true,
      checkoutToken: paymentData.checkoutToken,
      secretToken: paymentData.secretToken,
      // Echo derived amount so the client can sanity-check before opening modal.
      amount
    }
  } catch (error) {
    if (error.statusCode) throw error
    console.error('Error initializing HelcimPay:', error)
    throw createError({
      statusCode: 500,
      statusMessage: 'An unexpected error occurred'
    })
  }
})