/**
 * @file proof-of-reserves.ts
 * @notice Proof-of-Reserves system for wXRP
 */

import { ethers } from 'ethers';
import { HSMSigner } from './hsm-signer';

export interface ReserveProof {
    timestamp: number;
    totalSupply: string;
    xrplReserve: string;
    attestorSignatures: string[];
    merkleRoot?: string;
}

export interface ReserveAttestation {
    transferId: string;
    reserveProof: ReserveProof;
    hsmSignature: string;
}

export class ProofOfReserves {
    private provider: ethers.Provider;
    private wXRPAddress: string;
    private wXRPAbi: any[];
    private xrplConnector: any; // XRPL connector instance
    private hsmSigner: HSMSigner;
    private attestors: string[];

    constructor(
        provider: ethers.Provider,
        wXRPAddress: string,
        wXRPAbi: any[],
        xrplConnector: any,
        hsmSigner: HSMSigner,
        attestors: string[]
    ) {
        this.provider = provider;
        this.wXRPAddress = wXRPAddress;
        this.wXRPAbi = wXRPAbi;
        this.xrplConnector = xrplConnector;
        this.hsmSigner = hsmSigner;
        this.attestors = attestors;
    }

    /**
     * Generate proof-of-reserves
     */
    async generateProof(): Promise<ReserveProof> {
        // Get total supply of wXRP
        const wXRP = new ethers.Contract(this.wXRPAddress, this.wXRPAbi, this.provider);
        const totalSupply = await wXRP.totalSupply();

        // Get XRPL reserve balance
        const xrplBalance = await this.xrplConnector.getBalance();
        const xrplReserve = XRPLConnector.xrpToDrops(xrplBalance);

        // Generate attestations from all attestors
        const attestorSignatures: string[] = [];
        for (const attestor of this.attestors) {
            // In production, each attestor would sign independently
            // For now, placeholder
            attestorSignatures.push('0x' + '0'.repeat(130));
        }

        return {
            timestamp: Date.now(),
            totalSupply: totalSupply.toString(),
            xrplReserve,
            attestorSignatures
        };
    }

    /**
     * Verify proof-of-reserves
     */
    async verifyProof(proof: ReserveProof): Promise<boolean> {
        // Convert XRPL reserve to wei (assuming 1:1 XRP:wXRP)
        const xrplReserveWei = ethers.parseEther(
            XRPLConnector.dropsToXrp(proof.xrplReserve)
        );

        // Check if reserve >= total supply
        const totalSupply = BigInt(proof.totalSupply);
        if (xrplReserveWei < totalSupply) {
            return false;
        }

        // Verify attestor signatures (simplified)
        // In production, verify each signature against attestor public keys
        if (proof.attestorSignatures.length < this.attestors.length * 0.67) {
            return false; // Require 2/3 attestors
        }

        return true;
    }

    /**
     * Publish proof to registry (Fabric or on-chain)
     */
    async publishProof(proof: ReserveProof): Promise<string> {
        // Sign proof with HSM
        const typedData = {
            types: {
                EIP712Domain: [
                    { name: 'name', type: 'string' },
                    { name: 'version', type: 'string' },
                    { name: 'chainId', type: 'uint256' }
                ],
                ReserveProof: [
                    { name: 'timestamp', type: 'uint256' },
                    { name: 'totalSupply', type: 'uint256' },
                    { name: 'xrplReserve', type: 'string' }
                ]
            },
            domain: {
                name: 'ProofOfReserves',
                version: '1',
                chainId: 138
            },
            primaryType: 'ReserveProof',
            message: {
                timestamp: proof.timestamp,
                totalSupply: proof.totalSupply,
                xrplReserve: proof.xrplReserve
            }
        };

        const hsmSignature = await this.hsmSigner.signTypedData(typedData);

        // Publish to registry (implement based on registry type)
        // For now, return proof ID
        return ethers.keccak256(ethers.toUtf8Bytes(JSON.stringify(proof)));
    }

    /**
     * Get latest proof
     */
    async getLatestProof(): Promise<ReserveProof | null> {
        // Query registry for latest proof
        // For now, generate new proof
        return this.generateProof();
    }
}

// Re-export XRPLConnector types for convenience
import { XRPLConnector } from '../../connectors/cacti-xrpl/xrpl-connector';
