import type {
  AdHocNotificationService,
  FinanceCommandService,
  HouseholdOnboardingService
} from '@household/application'
import { Money } from '@household/domain'
import type { Logger } from '@household/observability'

import {
  allowedMiniAppOrigin,
  createMiniAppSessionService,
  miniAppErrorResponse,
  miniAppJsonResponse,
  readMiniAppRequestPayload
} from './miniapp-auth'

export function createMiniAppDashboardHandler(options: {
  allowedOrigins: readonly string[]
  botToken: string
  financeServiceForHousehold: (householdId: string) => FinanceCommandService
  adHocNotificationService: AdHocNotificationService
  onboardingService: HouseholdOnboardingService
  logger?: Logger
}): {
  handler: (request: Request) => Promise<Response>
} {
  const sessionService = createMiniAppSessionService({
    botToken: options.botToken,
    onboardingService: options.onboardingService
  })

  return {
    handler: async (request) => {
      const origin = allowedMiniAppOrigin(request, options.allowedOrigins)

      if (request.method === 'OPTIONS') {
        return miniAppJsonResponse({ ok: true }, 204, origin)
      }

      if (request.method !== 'POST') {
        return miniAppJsonResponse({ ok: false, error: 'Method Not Allowed' }, 405, origin)
      }

      try {
        const payload = await readMiniAppRequestPayload(request)
        if (!payload.initData) {
          return miniAppJsonResponse({ ok: false, error: 'Missing initData' }, 400, origin)
        }

        const session = await sessionService.authenticate(payload)
        if (!session) {
          return miniAppJsonResponse(
            { ok: false, error: 'Invalid Telegram init data' },
            401,
            origin
          )
        }

        if (!session.authorized) {
          return miniAppJsonResponse(
            {
              ok: true,
              authorized: false,
              onboarding: session.onboarding
            },
            403,
            origin
          )
        }

        if (!session.member) {
          return miniAppJsonResponse(
            { ok: false, error: 'Authenticated session is missing member context' },
            500,
            origin
          )
        }

        const dashboard = await options
          .financeServiceForHousehold(session.member.householdId)
          .generateDashboard()
        const notifications = await options.adHocNotificationService.listUpcomingNotifications({
          householdId: session.member.householdId,
          viewerMemberId: session.member.id
        })
        if (!dashboard) {
          return miniAppJsonResponse(
            { ok: false, error: 'No billing cycle available' },
            404,
            origin
          )
        }

        return miniAppJsonResponse(
          {
            ok: true,
            authorized: true,
            dashboard: {
              period: dashboard.period,
              currency: dashboard.currency,
              timezone: dashboard.timezone,
              rentWarningDay: dashboard.rentWarningDay,
              rentDueDay: dashboard.rentDueDay,
              utilitiesReminderDay: dashboard.utilitiesReminderDay,
              utilitiesDueDay: dashboard.utilitiesDueDay,
              paymentBalanceAdjustmentPolicy: dashboard.paymentBalanceAdjustmentPolicy,
              rentPaymentDestinations: dashboard.rentPaymentDestinations,
              totalDueMajor: dashboard.totalDue.toMajorString(),
              totalPaidMajor: dashboard.totalPaid.toMajorString(),
              totalRemainingMajor: dashboard.totalRemaining.toMajorString(),
              rentSourceAmountMajor: dashboard.rentSourceAmount.toMajorString(),
              rentSourceCurrency: dashboard.rentSourceAmount.currency,
              rentDisplayAmountMajor: dashboard.rentDisplayAmount.toMajorString(),
              rentFxRateMicros: dashboard.rentFxRateMicros?.toString() ?? null,
              rentFxEffectiveDate: dashboard.rentFxEffectiveDate,
              members: dashboard.members.map((line) => ({
                memberId: line.memberId,
                displayName: line.displayName,
                predictedUtilityShareMajor: line.predictedUtilityShare?.toMajorString() ?? null,
                rentShareMajor: line.rentShare.toMajorString(),
                utilityShareMajor: line.utilityShare.toMajorString(),
                purchaseOffsetMajor: line.purchaseOffset.toMajorString(),
                netDueMajor: line.netDue.toMajorString(),
                paidMajor: line.paid.toMajorString(),
                remainingMajor: line.remaining.toMajorString(),
                overduePayments: line.overduePayments.map((overdue) => ({
                  kind: overdue.kind,
                  amountMajor: Money.fromMinor(
                    overdue.amountMinor,
                    dashboard.currency
                  ).toMajorString(),
                  periods: overdue.periods
                })),
                explanations: line.explanations
              })),
              paymentPeriods: (dashboard.paymentPeriods ?? []).map((period) => ({
                period: period.period,
                utilityTotalMajor: period.utilityTotal.toMajorString(),
                hasOverdueBalance: period.hasOverdueBalance,
                isCurrentPeriod: period.isCurrentPeriod,
                kinds: period.kinds.map((kind) => ({
                  kind: kind.kind,
                  totalDueMajor: kind.totalDue.toMajorString(),
                  totalPaidMajor: kind.totalPaid.toMajorString(),
                  totalRemainingMajor: kind.totalRemaining.toMajorString(),
                  unresolvedMembers: kind.unresolvedMembers.map((member) => ({
                    memberId: member.memberId,
                    displayName: member.displayName,
                    suggestedAmountMajor: member.suggestedAmount.toMajorString(),
                    baseDueMajor: member.baseDue.toMajorString(),
                    paidMajor: member.paid.toMajorString(),
                    remainingMajor: member.remaining.toMajorString(),
                    effectivelySettled: member.effectivelySettled
                  }))
                }))
              })),
              ledger: dashboard.ledger.map((entry) => ({
                id: entry.id,
                kind: entry.kind,
                title: entry.title,
                memberId: entry.memberId,
                paymentKind: entry.paymentKind,
                amountMajor: entry.amount.toMajorString(),
                currency: entry.currency,
                displayAmountMajor: entry.displayAmount.toMajorString(),
                displayCurrency: entry.displayCurrency,
                fxRateMicros: entry.fxRateMicros?.toString() ?? null,
                fxEffectiveDate: entry.fxEffectiveDate,
                actorDisplayName: entry.actorDisplayName,
                occurredAt: entry.occurredAt,
                ...(entry.kind === 'purchase'
                  ? {
                      purchaseSplitMode: entry.purchaseSplitMode ?? 'equal',
                      originPeriod: entry.originPeriod ?? null,
                      resolutionStatus: entry.resolutionStatus ?? 'unresolved',
                      resolvedAt: entry.resolvedAt ?? null,
                      outstandingByMember:
                        entry.outstandingByMember?.map((outstanding) => ({
                          memberId: outstanding.memberId,
                          amountMajor: outstanding.amount.toMajorString()
                        })) ?? [],
                      purchaseParticipants:
                        entry.purchaseParticipants?.map((participant) => ({
                          memberId: participant.memberId,
                          included: participant.included,
                          shareAmountMajor: participant.shareAmount?.toMajorString() ?? null
                        })) ?? []
                    }
                  : {})
              })),
              notifications: notifications.map((notification) => ({
                id: notification.id,
                summaryText: notification.notificationText,
                scheduledFor: notification.scheduledFor.toString(),
                status: notification.status,
                deliveryMode: notification.deliveryMode,
                dmRecipientMemberIds: notification.dmRecipientMemberIds,
                dmRecipientDisplayNames: notification.dmRecipientDisplayNames,
                creatorMemberId: notification.creatorMemberId,
                creatorDisplayName: notification.creatorDisplayName,
                assigneeMemberId: notification.assigneeMemberId,
                assigneeDisplayName: notification.assigneeDisplayName,
                canCancel: notification.canCancel,
                canEdit: notification.canEdit
              }))
            }
          },
          200,
          origin
        )
      } catch (error) {
        return miniAppErrorResponse(error, origin, options.logger)
      }
    }
  }
}