/**
 * @file tokenized-asset-reserves.ts
 * @notice Tokenized asset reserves for bridging
 */

import { BridgeReserveService, ReserveStatus, PegStatus } from './bridge-reserve.service';
import { TokenRegistry } from '../../contracts/tokenization/TokenRegistry';
import { BridgeEscrowVault } from '../../contracts/bridge/interop/BridgeEscrowVault';

export interface TokenizedAssetReserve {
    tokenAddress: string;
    fabricTokenId: string;
    underlyingAsset: string;
    bridgeAmount: string;
    reserveBalance: string;
    fabricReserve: string;
    besuReserve: string;
    reserveRatio: number;
    isSufficient: boolean;
    lastVerified: number;
}

export class TokenizedAssetReserveIntegration {
    private bridgeReserve: BridgeReserveService;
    private tokenRegistry: TokenRegistry;
    private escrowVault: BridgeEscrowVault;

    constructor(
        bridgeReserve: BridgeReserveService,
        tokenRegistry: TokenRegistry,
        escrowVault: BridgeEscrowVault
    ) {
        this.bridgeReserve = bridgeReserve;
        this.tokenRegistry = tokenRegistry;
        this.escrowVault = escrowVault;
    }

    /**
     * Get reserve status for tokenized asset
     */
    async getTokenizedAssetReserve(tokenAddress: string): Promise<TokenizedAssetReserve> {
        // Get token metadata
        const tokenMetadata = await this.tokenRegistry.getToken(tokenAddress);

        // Get bridge amount (locked in escrow)
        const bridgeAmount = await this.getBridgeAmount(tokenAddress);

        // Get Fabric reserve
        const fabricReserve = await this.getFabricReserve(tokenMetadata.backingReserve);

        // Get Besu reserve (token balance in escrow vault)
        const besuReserve = await this.getBesuReserve(tokenAddress);

        // Calculate total reserve
        const totalReserve = BigInt(fabricReserve) + BigInt(besuReserve);
        const reserveBalance = totalReserve.toString();

        // Calculate reserve ratio
        const reserveRatio = bridgeAmount > 0
            ? Number(totalReserve) / Number(bridgeAmount)
            : 1.0;

        return {
            tokenAddress,
            fabricTokenId: tokenMetadata.tokenId,
            underlyingAsset: tokenMetadata.underlyingAsset,
            bridgeAmount: bridgeAmount.toString(),
            reserveBalance,
            fabricReserve,
            besuReserve,
            reserveRatio,
            isSufficient: reserveRatio >= 1.0,
            lastVerified: Date.now()
        };
    }

    /**
     * Verify reserve for bridge transfer
     */
    async verifyReserveForBridge(
        tokenAddress: string,
        amount: string,
        destinationChainId: number
    ): Promise<{ verified: boolean; reason?: string }> {
        const reserve = await this.getTokenizedAssetReserve(tokenAddress);

        const requiredAmount = BigInt(amount);
        const availableReserve = BigInt(reserve.reserveBalance) - BigInt(reserve.bridgeAmount);

        if (availableReserve < requiredAmount) {
            return {
                verified: false,
                reason: `Insufficient reserve: required ${amount}, available ${availableReserve.toString()}`
            };
        }

        // Check reserve ratio
        if (reserve.reserveRatio < 1.0) {
            return {
                verified: false,
                reason: `Reserve ratio below 1:1: ${reserve.reserveRatio}`
            };
        }

        return { verified: true };
    }

    /**
     * Allocate reserve for bridge transfer
     */
    async allocateReserveForBridge(
        tokenAddress: string,
        amount: string,
        transferId: string
    ): Promise<{ success: boolean; allocatedAmount: string }> {
        const verification = await this.verifyReserveForBridge(tokenAddress, amount, 0);
        
        if (!verification.verified) {
            return {
                success: false,
                allocatedAmount: '0'
            };
        }

        // Allocate reserve (in production, update Fabric reserve manager)
        const allocatedAmount = amount;

        return {
            success: true,
            allocatedAmount
        };
    }

    /**
     * Release reserve after bridge completion
     */
    async releaseReserveForBridge(
        tokenAddress: string,
        amount: string,
        transferId: string
    ): Promise<{ success: boolean }> {
        // Release reserve (in production, update Fabric reserve manager)
        return { success: true };
    }

    /**
     * Get bridge amount (locked in escrow)
     */
    private async getBridgeAmount(tokenAddress: string): Promise<bigint> {
        // In production, query escrow vault for total locked amount
        return BigInt(0);
    }

    /**
     * Get Fabric reserve
     */
    private async getFabricReserve(reserveId: string): Promise<string> {
        // In production, query Fabric reserve manager chaincode
        return '0';
    }

    /**
     * Get Besu reserve
     */
    private async getBesuReserve(tokenAddress: string): Promise<string> {
        // In production, query token balance in escrow vault
        return '0';
    }

    /**
     * Get peg status for tokenized asset
     */
    async getTokenizedAssetPegStatus(tokenAddress: string): Promise<PegStatus> {
        const tokenMetadata = await this.tokenRegistry.getToken(tokenAddress);
        
        // Tokenized assets should maintain 1:1 peg with underlying
        return {
            asset: tokenMetadata.underlyingAsset,
            currentPrice: '1.0',
            targetPrice: '1.0',
            deviationBps: 0,
            isMaintained: true
        };
    }
}
