// Create a Helcim subscription
import { getHelcimPlanId, requiresPayment, getContributionTierByValue } from '../../config/contributions.js'
import Member from '../../models/member.js'
import { connectDB } from '../../utils/mongoose.js'
import { getSlackService } from '../../utils/slack.ts'
import { requireAuth } from '../../utils/auth.js'
import { createHelcimSubscription, generateIdempotencyKey } from '../../utils/helcim.js'
import { sendWelcomeEmail } from '../../utils/resend.js'

// Function to invite member to Slack
async function inviteToSlack(member) {
  try {
    const slackService = getSlackService()
    if (!slackService) {
      console.warn('Slack service not configured, skipping invitation')
      return
    }

    console.log(`Processing Slack invitation for ${member.email}...`)
    
    const inviteResult = await slackService.inviteUserToSlack(
      member.email,
      member.name
    )

    if (inviteResult.success) {
      const update = {}
      if (inviteResult.status === 'existing_user_added_to_channel' ||
          inviteResult.status === 'user_already_in_channel' ||
          inviteResult.status === 'new_user_invited_to_workspace') {
        update.slackInviteStatus = 'sent'
        update.slackUserId = inviteResult.userId
        update.slackInvited = true
      } else {
        update.slackInviteStatus = 'pending'
        update.slackInvited = false
      }
      await Member.findByIdAndUpdate(
        member._id,
        { $set: update },
        { runValidators: false }
      )

      // Send notification to vetting channel
      await slackService.notifyNewMember(
        member.name,
        member.email,
        member.circle,
        member.contributionTier,
        inviteResult.status
      )

      console.log(`Successfully processed Slack invitation for ${member.email}: ${inviteResult.status}`)
    } else {
      await Member.findByIdAndUpdate(
        member._id,
        { $set: { slackInviteStatus: 'failed' } },
        { runValidators: false }
      )

      console.error(`Failed to process Slack invitation for ${member.email}: ${inviteResult.error}`)
      // Don't throw error - subscription creation should still succeed
    }
  } catch (error) {
    console.error('Error during Slack invitation process:', error)

    try {
      await Member.findByIdAndUpdate(
        member._id,
        { $set: { slackInviteStatus: 'failed' } },
        { runValidators: false }
      )
    } catch (saveError) {
      console.error('Failed to update member Slack status:', saveError)
    }
    
    // Don't throw error - subscription creation should still succeed
  }
}

export default defineEventHandler(async (event) => {
  try {
    await requireAuth(event)
    await connectDB()
    const body = await validateBody(event, helcimSubscriptionSchema)

    // Only send welcome email when a member transitions from pending_payment
    // to active for the first time — not on tier upgrades (active → active).
    const priorMember = await Member.findOne(
      { helcimCustomerId: body.customerId },
      { status: 1 }
    )
    const isFirstActivation = priorMember?.status === 'pending_payment'

    // Check if payment is required
    if (!requiresPayment(body.contributionTier)) {
      // For free tier, just update member status
      const member = await Member.findOneAndUpdate(
        { helcimCustomerId: body.customerId },
        { 
          status: 'active',
          contributionTier: body.contributionTier,
          subscriptionStartDate: new Date()
        },
        { new: true }
      )
      
      logActivity(member._id, 'subscription_created', { tier: body.contributionTier })

      await inviteToSlack(member)
      if (isFirstActivation) await sendWelcomeEmail(member)

      return {
        success: true,
        subscription: null,
        member: {
          id: member._id,
          email: member.email,
          name: member.name,
          circle: member.circle,
          contributionTier: member.contributionTier,
          status: member.status
        }
      }
    }

    // Get the Helcim plan ID
    const planId = getHelcimPlanId(body.contributionTier)
    
    // Validate card token is provided
    if (!body.cardToken) {
      throw createError({
        statusCode: 400,
        statusMessage: 'Payment information is required for this contribution tier'
      })
    }

    // Check if we have a configured plan for this tier
    if (!planId) {
      const member = await Member.findOneAndUpdate(
        { helcimCustomerId: body.customerId },
        { 
          status: 'active',
          contributionTier: body.contributionTier,
          subscriptionStartDate: new Date(),
          paymentMethod: 'card',
          cardToken: body.cardToken,
          notes: `Payment successful but no Helcim plan configured for tier ${body.contributionTier}`
        },
        { new: true }
      )

      await inviteToSlack(member)
      if (isFirstActivation) await sendWelcomeEmail(member)

      return {
        success: true,
        subscription: {
          subscriptionId: 'manual-' + Date.now(),
          status: 'needs_plan_setup',
          nextBillingDate: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000)
        },
        member: {
          id: member._id,
          email: member.email,
          name: member.name,
          circle: member.circle,
          contributionTier: member.contributionTier,
          status: member.status
        },
        warning: `Payment successful but recurring plan needs to be set up in Helcim for the ${body.contributionTier} tier`
      }
    }

    // Try to create subscription in Helcim
    const idempotencyKey = generateIdempotencyKey()

    // Get contribution tier details to set recurring amount
    const tierInfo = getContributionTierByValue(body.contributionTier)

    const subscriptionPayload = {
      dateActivated: new Date().toISOString().split('T')[0], // Today in YYYY-MM-DD format
      paymentPlanId: parseInt(planId),
      customerCode: body.customerCode,
      recurringAmount: parseFloat(tierInfo.amount),
      paymentMethod: 'card'
    }

    try {
      const subscriptionData = await createHelcimSubscription(subscriptionPayload, idempotencyKey)

      // Extract the first subscription from the response array
      const subscription = subscriptionData.data?.[0]
      if (!subscription) {
        throw new Error('No subscription returned in response')
      }

      // Update member in database
      const member = await Member.findOneAndUpdate(
        { helcimCustomerId: body.customerId },
        {
          status: 'active',
          contributionTier: body.contributionTier,
          helcimSubscriptionId: subscription.id,
          subscriptionStartDate: new Date(),
          paymentMethod: 'card'
        },
        { new: true }
      )

      logActivity(member._id, 'subscription_created', { tier: body.contributionTier })

      await inviteToSlack(member)
      if (isFirstActivation) await sendWelcomeEmail(member)

      return {
        success: true,
        subscription: {
          subscriptionId: subscription.id,
          status: subscription.status,
          nextBillingDate: subscription.nextBillingDate
        },
        member: {
          id: member._id,
          email: member.email,
          name: member.name,
          circle: member.circle,
          contributionTier: member.contributionTier,
          status: member.status
        }
      }
    } catch (helcimError) {
      // The helper throws createError on non-OK responses (statusCode = upstream HTTP status)
      // and lets network errors propagate. We treat 400/404 from upstream AND any network
      // error as the "manual setup needed" fallback. Re-throw other upstream errors (e.g. 5xx).
      if (helcimError.statusCode && helcimError.statusCode !== 400 && helcimError.statusCode !== 404) {
        throw helcimError
      }
      console.error('Error during subscription creation:', helcimError)

      // Still mark member as active since payment was successful
      const member = await Member.findOneAndUpdate(
        { helcimCustomerId: body.customerId },
        {
          status: 'active',
          contributionTier: body.contributionTier,
          subscriptionStartDate: new Date(),
          paymentMethod: 'card',
          cardToken: body.cardToken,
          notes: `Payment successful but subscription creation failed: ${helcimError.message || 'unknown error'}`
        },
        { new: true }
      )

      await inviteToSlack(member)
      if (isFirstActivation) await sendWelcomeEmail(member)

      return {
        success: true,
        subscription: {
          subscriptionId: 'manual-' + Date.now(),
          status: 'needs_setup',
          nextBillingDate: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000)
        },
        member: {
          id: member._id,
          email: member.email,
          name: member.name,
          circle: member.circle,
          contributionTier: member.contributionTier,
          status: member.status
        },
        warning: 'Payment successful but recurring subscription needs manual setup'
      }
    }
  } catch (error) {
    if (error.statusCode) throw error
    console.error('Error creating Helcim subscription:', error)
    throw createError({
      statusCode: 500,
      statusMessage: 'An unexpected error occurred'
    })
  }
})