// Create a Helcim subscription
import { getHelcimPlanId, requiresPayment } 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'

const HELCIM_API_BASE = 'https://api.helcim.com/v2'

// 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) {
      // Update member record based on the actual result
      if (inviteResult.status === 'existing_user_added_to_channel' || 
          inviteResult.status === 'user_already_in_channel' || 
          inviteResult.status === 'new_user_invited_to_workspace') {
        member.slackInviteStatus = 'sent'
        member.slackUserId = inviteResult.userId
        member.slackInvited = true
      } else {
        // Manual invitation required
        member.slackInviteStatus = 'pending'
        member.slackInvited = false
      }
      await member.save()
      
      // 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 {
      // Update member record to reflect failed invitation
      member.slackInviteStatus = 'failed'
      await member.save()
      
      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)
    
    // Update member record to reflect failed invitation
    try {
      member.slackInviteStatus = 'failed'
      await member.save()
    } 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 config = useRuntimeConfig(event)
    const body = await validateBody(event, helcimSubscriptionSchema)

    // 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 }
      )
      
      // Send Slack invitation for free tier members
      await inviteToSlack(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 }
      )

      // Send Slack invitation even when no plan is configured
      await inviteToSlack(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 helcimToken = config.public.helcimToken || process.env.NUXT_PUBLIC_HELCIM_TOKEN
    
    // Generate a proper alphanumeric idempotency key (exactly 25 characters)
    const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
    let idempotencyKey = ''
    for (let i = 0; i < 25; i++) {
      idempotencyKey += chars.charAt(Math.floor(Math.random() * chars.length))
    }
    
    // Get contribution tier details to set recurring amount
    const { getContributionTierByValue } = await import('../../config/contributions.js')
    const tierInfo = getContributionTierByValue(body.contributionTier)
    
    const requestBody = {
      subscriptions: [{
        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'
      }]
    }
    const requestHeaders = {
      'accept': 'application/json',
      'content-type': 'application/json',
      'api-token': helcimToken,
      'idempotency-key': idempotencyKey
    }
    
    try {
      const subscriptionResponse = await fetch(`${HELCIM_API_BASE}/subscriptions`, {
        method: 'POST',
        headers: requestHeaders,
        body: JSON.stringify(requestBody)
      })
      
      if (!subscriptionResponse.ok) {
        const errorText = await subscriptionResponse.text()
        console.error('Subscription creation failed:', subscriptionResponse.status)
        
        // If it's a validation error, let's try to get more info about available plans
        if (subscriptionResponse.status === 400 || subscriptionResponse.status === 404) {
          // Plan might not exist -- update member status and proceed
          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: ${errorText}`
            },
            { new: true }
          )

          // Send Slack invitation even when subscription setup fails
          await inviteToSlack(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'
          }
        }
        
        throw createError({
          statusCode: subscriptionResponse.status,
          statusMessage: 'Subscription creation failed'
        })
      }
      
      const subscriptionData = await subscriptionResponse.json()

      // 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 }
      )

      // Send Slack invitation for paid tier members
      await inviteToSlack(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 (fetchError) {
      console.error('Error during subscription creation:', fetchError)
      
      // 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: ${fetchError.message}`
        },
        { new: true }
      )

      // Send Slack invitation even when subscription fetch fails
      await inviteToSlack(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'
    })
  }
})