// NFT verification for promotion codes
// TODO: This module needs implementation for NFT-based promotion code validation

import logger from '../logger';
import { PromotionCode, Coupon } from '../../store/models';
import { validPromotionCode } from './coupon';

/**
 * NFT verification config interface
 */
export interface NFTConfig {
  addresses?: string[];
  tags?: string[];
  trusted_issuers?: string[];
  trusted_parents?: string[];
  min_balance?: number;
}

/**
 * NFT match result interface
 */
export interface NFTMatchResult {
  valid: boolean;
  matchedNFTs: Array<{
    address: string;
    tag?: string;
    type: 'tag_match' | 'address_match';
  }>;
}

/**
 * NFT verification using separated NFT config structure
 * TODO: Implement proper NFT client integration
 */
export function verifyNFTConfig(userDid: string, nftConfig: NFTConfig): Promise<NFTMatchResult> {
  return Promise.resolve()
    .then(() => {
      // TODO: Implement proper NFT client integration
      // This should connect to blockchain services to verify NFT ownership
      logger.info('NFT verification called', { userDid, nftConfig });

      // Placeholder implementation - always returns false for now
      // In real implementation, this would:
      // 1. Connect to blockchain client (ArcBlock, Ethereum, etc.)
      // 2. Query user's NFT assets
      // 3. Match against config requirements (addresses, tags, issuers, parents)
      // 4. Check minimum balance requirements

      return {
        valid: false, // TODO: Implement actual verification
        matchedNFTs: [],
      };
    })
    .catch((error) => {
      logger.error('Error verifying NFT config', {
        userDid,
        nftConfig,
        error: error.message,
      });

      return {
        valid: false,
        matchedNFTs: [],
      };
    });
}

/**
 * Validates NFT voucher and returns associated promotion code
 * TODO: This function needs proper NFT ownership verification
 */
export function validateNFTVoucher(
  nftAddress: string,
  userDid: string,
  paymentMethodId: string
): { valid: boolean; error?: string; nftAddress?: string; promotionCode?: any; coupon?: any; discount?: any } {
  try {
    logger.info('NFT voucher validation called', { nftAddress, userDid, paymentMethodId });

    // TODO: Implement NFT ownership verification
    // This should:
    // 1. Verify user owns the NFT at the given address
    // 2. Find promotion code mapped to this NFT
    // 3. Return validation result

    return { valid: false, error: 'NFT_VERIFICATION_NOT_IMPLEMENTED' };
  } catch (error) {
    logger.error('Error validating NFT voucher', {
      nftAddress,
      userDid,
      error: error.message,
    });
    return { valid: false, error: error.message };
  }
}

/**
 * 根据用户DID匹配可用的NFT促销
 * TODO: This function needs to be integrated with actual NFT verification
 */
export function getNFTPromotions(
  userDid: string,
  currencyId: string,
  amount?: string
): Promise<
  Array<{
    promotion_code_id: string;
    code: string;
    coupon: any;
    matched_nfts: Array<{
      address: string;
      tag?: string;
      type: 'tag_match' | 'address_match';
    }>;
    discount_amount: string;
    discount_type: 'amount_off' | 'percent_off';
  }>
> {
  return Promise.resolve()
    .then(() => {
      logger.info('NFT promotions query called', { userDid, currencyId, amount });

      // TODO: Implement NFT promotion matching
      // This should:
      // 1. Query promotion codes with NFT verification requirements
      // 2. Check user's NFT ownership against each requirement
      // 3. Return matching promotions with discount information

      return []; // Placeholder - return empty array until implemented
    })
    .catch((error) => {
      logger.error('Error getting NFT promotions', { userDid, currencyId, error: error.message });
      return [];
    });
}

/**
 * 新的促销码验证函数，支持NFT验证模式
 * TODO: This function needs integration with proper NFT verification systems
 */
export async function validatePromotionCodeWithNFT(
  code: string,
  customerId: string,
  currencyId: string,
  amount: string,
  userDid?: string,
  inputMethod: 'code' | 'nft' = 'code'
) {
  try {
    logger.info('Promotion code validation with NFT support called', {
      code,
      customerId,
      currencyId,
      amount,
      userDid,
      inputMethod,
    });

    // Find promotion code
    const promotionCode = await PromotionCode.findOne({
      where: {
        code: code.toLowerCase(),
        active: true,
      },
      include: [
        {
          model: Coupon,
          as: 'coupon',
          required: true,
        },
      ],
    });

    if (!promotionCode) {
      return { valid: false, error: 'PROMOTION_CODE_NOT_FOUND' };
    }

    // Basic validation using coupon.ts logic
    const basicValidation = await validPromotionCode(promotionCode, {
      customerId,
      amount,
      currencyId,
    });

    if (!basicValidation.valid) {
      return {
        valid: false,
        error: basicValidation.reason || 'PROMOTION_CODE_INVALID',
      };
    }

    // Check for NFT verification requirements
    if (promotionCode.verification_type === 'nft' && promotionCode.nft_config) {
      if (!userDid) {
        return { valid: false, error: 'USER_AUTHENTICATION_REQUIRED' };
      }

      // TODO: Implement NFT verification
      const nftVerification = await verifyNFTConfig(userDid, promotionCode.nft_config);

      if (!nftVerification.valid) {
        return { valid: false, error: 'NFT_VERIFICATION_FAILED' };
      }
    }

    // Build success response
    const { coupon } = promotionCode as any;
    const discount: any = {
      duration: coupon.duration,
      duration_in_months: coupon.duration_in_months,
    };

    if (coupon.percent_off && coupon.percent_off > 0) {
      discount.type = 'percent';
      discount.value = coupon.percent_off;
    } else if (coupon.amount_off && coupon.amount_off !== '0') {
      discount.type = 'amount';
      discount.value = coupon.amount_off;
      discount.currency_id = currencyId;
    }

    return {
      valid: true,
      promotionCode,
      coupon,
      discount,
    };
  } catch (error) {
    logger.error('Error validating promotion code with NFT', {
      code,
      customerId,
      currencyId,
      userDid,
      inputMethod,
      error: error.message,
    });
    return { valid: false, error: error.message };
  }
}
