// Cross-Chain Contract Service
// Atomic swap logic: if (SCB1.commit && SCB2.commit && DBIS.commit) execute_atomic_swap(); else revert();

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';


export class CrossChainContractService {
  /**
   * Execute atomic swap
   * Logic: if (SCB1.commit && SCB2.commit && DBIS.commit) execute_atomic_swap(); else revert();
   */
  async executeAtomicSwap(
    settlementId: string,
    scb1Id: string,
    scb2Id: string
  ): Promise<boolean> {
    // Get all commitments
    const commitments = await prisma.crossChainCommitment.findMany({
      where: { settlementId },
    });

    // Check SCB1 commit
    const scb1Commit = commitments.find(
      (c) => c.chainId === scb1Id && c.commitmentType === 'scb1_commit'
    );

    // Check SCB2 commit
    const scb2Commit = commitments.find(
      (c) => c.chainId === scb2Id && c.commitmentType === 'scb2_commit'
    );

    // Check DBIS commit
    const dbisCommit = commitments.find(
      (c) => c.commitmentType === 'dbis_commit'
    );

    // Verify all commitments
    if (!scb1Commit || !scb2Commit || !dbisCommit) {
      // Revert
      await this.revert(settlementId);
      return false;
    }

    // Check if all commitments are committed
    const scb1Committed = scb1Commit.status === 'committed';
    const scb2Committed = scb2Commit.status === 'committed';
    const dbisCommitted = dbisCommit.status === 'committed';

    // Execute atomic swap if all committed
    if (scb1Committed && scb2Committed && dbisCommitted) {
      return await this.executeSwap(settlementId);
    } else {
      // Revert
      await this.revert(settlementId);
      return false;
    }
  }

  /**
   * Commit to chain
   */
  async commitToChain(
    settlementId: string,
    chainId: string,
    commitmentType: string
  ): Promise<boolean> {
    const commitment = await prisma.crossChainCommitment.findFirst({
      where: {
        settlementId,
        chainId,
        commitmentType,
      },
    });

    if (!commitment) {
      return false;
    }

    // Mark as committed
    await prisma.crossChainCommitment.update({
      where: { commitmentId: commitment.commitmentId },
      data: {
        status: 'committed',
        committedAt: new Date(),
      },
    });

    return true;
  }

  /**
   * Execute swap
   */
  private async executeSwap(settlementId: string): Promise<boolean> {
    const settlement = await prisma.crossChainSettlement.findUnique({
      where: { settlementId },
    });

    if (!settlement) {
      return false;
    }

    try {
      // In production, this would:
      // 1. Transfer assets on source chain
      // 2. Transfer assets on target chain
      // 3. Update balances
      // 4. Finalize settlement

      // Mark commitments as verified
      await prisma.crossChainCommitment.updateMany({
        where: { settlementId },
        data: {
          status: 'verified',
        },
      });

      return true;
    } catch (error) {
      await this.revert(settlementId);
      return false;
    }
  }

  /**
   * Revert settlement
   */
  private async revert(settlementId: string): Promise<void> {
    // Mark all commitments as failed
    await prisma.crossChainCommitment.updateMany({
      where: { settlementId },
      data: {
        status: 'reverted',
      },
    });

    // Mark settlement as failed
    await prisma.crossChainSettlement.update({
      where: { settlementId },
      data: {
        status: 'failed',
      },
    });
  }

  /**
   * Get commitments for settlement
   */
  async getCommitments(settlementId: string) {
    return await prisma.crossChainCommitment.findMany({
      where: { settlementId },
    });
  }

  /**
   * Verify commitment
   */
  async verifyCommitment(
    commitmentId: string,
    expectedHash: string
  ): Promise<boolean> {
    const commitment = await prisma.crossChainCommitment.findUnique({
      where: { commitmentId },
    });

    if (!commitment) {
      return false;
    }

    return commitment.commitmentHash === expectedHash;
  }
}

export const crossChainContractService = new CrossChainContractService();

