// SSU Transaction Service
// SSU transaction processing
// Atomic swaps with SSU
// SSU conversion tracking

import prisma from '@/shared/database/prisma';
import { Decimal } from '@prisma/client/runtime/library';
import { v4 as uuidv4 } from 'uuid';


export interface SsuTransactionRequest {
  ssuId: string;
  transactionType: string;
  amount: string;
  sourceBankId?: string;
  destinationBankId?: string;
  settlementId?: string;
}

export class SsuTransactionService {
  /**
   * Create SSU transaction
   */
  async createTransaction(
    request: SsuTransactionRequest
  ): Promise<string> {
    const transactionId = `SSU-TX-${uuidv4()}`;

    const transaction = await prisma.ssu_transactions.create({
      data: {
        id: uuidv4(),
        transactionId,
        ssuId: request.ssuId,
        transactionType: request.transactionType,
        amount: new Decimal(request.amount),
        sourceBankId: request.sourceBankId || null,
        destinationBankId: request.destinationBankId || null,
        settlementId: request.settlementId || null,
        status: 'pending',
        createdAt: new Date(),
        updatedAt: new Date(),
      },
    });

    // Process transaction based on type
    await this.processTransaction(transaction.transactionId);

    return transaction.transactionId;
  }

  /**
   * Process SSU transaction
   */
  private async processTransaction(transactionId: string): Promise<void> {
    const transaction = await prisma.ssu_transactions.findUnique({
      where: { transactionId },
    });

    if (!transaction) {
      return;
    }

    try {
      switch (transaction.transactionType) {
        case 'mint':
          await this.processMint(transaction);
          break;
        case 'burn':
          await this.processBurn(transaction);
          break;
        case 'settle':
          await this.processSettlement(transaction);
          break;
        case 'redeem':
          await this.processRedemption(transaction);
          break;
        case 'recycle':
          await this.processRecycle(transaction);
          break;
        default:
          throw new Error(`Unknown transaction type: ${transaction.transactionType}`);
      }

      // Mark transaction as completed
      await prisma.ssu_transactions.update({
        where: { transactionId },
        data: {
          status: 'completed',
          completedAt: new Date(),
        },
      });
    } catch (error) {
      await prisma.ssu_transactions.update({
        where: { transactionId },
        data: {
          status: 'failed',
        },
      });

      throw error;
    }
  }

  /**
   * Process mint transaction
   */
  private async processMint(transaction: any): Promise<void> {
    // In production, this would:
    // 1. Mint SSU tokens
    // 2. Allocate underlying assets
    // 3. Update balances
    // For now, just mark as processed
  }

  /**
   * Process burn transaction
   */
  private async processBurn(transaction: any): Promise<void> {
    // In production, this would:
    // 1. Burn SSU tokens
    // 2. Release underlying assets
    // 3. Update balances
    // For now, just mark as processed
  }

  /**
   * Process settlement transaction
   */
  private async processSettlement(transaction: any): Promise<void> {
    if (!transaction.sourceBankId || !transaction.destinationBankId) {
      throw new Error('Settlement transaction requires source and destination banks');
    }

    // In production, this would:
    // 1. Execute atomic swap
    // 2. Transfer SSU between banks
    // 3. Update balances
    // 4. Link to settlement record
    // For now, just mark as processed
  }

  /**
   * Process redemption transaction
   */
  private async processRedemption(transaction: any): Promise<void> {
    // In production, this would:
    // 1. Convert SSU to target asset
    // 2. Transfer assets
    // 3. Update balances
    // For now, just mark as processed
  }

  /**
   * Process recycle transaction
   */
  private async processRecycle(transaction: any): Promise<void> {
    // In production, this would:
    // 1. Return SSU to pool
    // 2. Release underlying assets
    // 3. Update balances
    // For now, just mark as processed
  }

  /**
   * Execute atomic swap with SSU
   */
  async executeAtomicSwap(
    ssuId: string,
    sourceBankId: string,
    destinationBankId: string,
    amount: string,
    targetAssetType: string,
    targetAssetId: string
  ): Promise<string> {
    // Create swap transaction
    const transactionId = await this.createTransaction({
      ssuId,
      transactionType: 'settle',
      amount,
      sourceBankId,
      destinationBankId,
    });

    // In production, this would:
    // 1. Lock SSU on source
    // 2. Lock target asset on destination
    // 3. Execute atomic swap
    // 4. Update balances

    return transactionId;
  }

  /**
   * Track SSU conversion
   */
  async trackConversion(
    transactionId: string,
    fromAsset: string,
    toAsset: string,
    rate: string
  ): Promise<void> {
    // In production, this would track conversion details
    // Note: ssu_transactions model doesn't have metadata field
    // Conversion details are tracked via the transaction record itself
  }

  /**
   * Get SSU transactions
   */
  async getTransactions(
    ssuId?: string,
    transactionType?: string,
    status?: string,
    limit: number = 100
  ) {
    return await prisma.ssu_transactions.findMany({
      where: {
        ...(ssuId && { ssuId }),
        ...(transactionType && { transactionType }),
        ...(status && { status }),
      },
      orderBy: { createdAt: 'desc' },
      take: limit,
    });
  }

  /**
   * Get transaction by ID
   */
  async getTransaction(transactionId: string) {
    return await prisma.ssu_transactions.findUnique({
      where: { transactionId },
    });
  }

  /**
   * Get transactions for a settlement
   */
  async getTransactionsForSettlement(settlementId: string) {
    return await prisma.ssu_transactions.findMany({
      where: { settlementId },
    });
  }
}

export const ssuTransactionService = new SsuTransactionService();

