/**
 * @file tokenization-workflow.ts
 * @notice FireFly tokenization workflow orchestrator
 */

import { ethers } from 'ethers';
import { TokenizedEUR } from '../../contracts/tokenization/TokenizedEUR';
import { TokenRegistry } from '../../contracts/tokenization/TokenRegistry';

export enum TokenizationStatus {
    INITIATED = 'INITIATED',
    RESERVE_VERIFIED = 'RESERVE_VERIFIED',
    FABRIC_MINTING = 'FABRIC_MINTING',
    FABRIC_MINTED = 'FABRIC_MINTED',
    BESU_MINTING = 'BESU_MINTING',
    BESU_MINTED = 'BESU_MINTED',
    SETTLEMENT_CONFIRMED = 'SETTLEMENT_CONFIRMED',
    REGULATORY_REPORTED = 'REGULATORY_REPORTED',
    COMPLETED = 'COMPLETED',
    FAILED = 'FAILED'
}

export interface TokenizationRequest {
    requestId: string;
    underlyingAsset: string; // EUR, USD, etc.
    amount: string;
    issuer: string;
    reserveId: string;
    recipient?: string; // Optional recipient address
    regulatoryFlags?: Record<string, any>;
}

export interface TokenizationResult {
    requestId: string;
    fabricTokenId: string;
    fabricTxHash: string;
    besuTokenAddress: string;
    besuTxHash: string;
    status: TokenizationStatus;
    settlementFile?: SettlementFile;
}

export interface SettlementFile {
    blockchain: {
        hash: string;
        from: string;
        to: string;
        value: string;
        gas: string;
        gasPrice: string;
        nonce: string;
        blockNumber: string;
        transactionIndex: string;
        input: string;
        chainId: string;
        usdtErc20: string;
    };
    traditional: {
        swiftReference?: string;
        target2Code?: string;
        regulatoryFlags?: Record<string, any>;
        identityCode?: string;
        permitCode?: string;
        accessCode?: string;
    };
}

export class TokenizationWorkflow {
    private provider: ethers.Provider;
    private tokenRegistry: ethers.Contract;
    private fireflyApiUrl: string;
    private fabricApiUrl: string;
    private cactiApiUrl: string;

    constructor(
        rpcUrl: string,
        tokenRegistryAddress: string,
        tokenRegistryAbi: any[],
        fireflyApiUrl: string,
        fabricApiUrl: string,
        cactiApiUrl: string
    ) {
        this.provider = new ethers.JsonRpcProvider(rpcUrl);
        this.tokenRegistry = new ethers.Contract(tokenRegistryAddress, tokenRegistryAbi, this.provider);
        this.fireflyApiUrl = fireflyApiUrl;
        this.fabricApiUrl = fabricApiUrl;
        this.cactiApiUrl = cactiApiUrl;
    }

    /**
     * Initiate tokenization workflow
     */
    async initiateTokenization(request: TokenizationRequest): Promise<TokenizationResult> {
        const result: TokenizationResult = {
            requestId: request.requestId,
            fabricTokenId: '',
            fabricTxHash: '',
            besuTokenAddress: '',
            besuTxHash: '',
            status: TokenizationStatus.INITIATED
        };

        try {
            // Step 1: Verify reserves
            result.status = TokenizationStatus.RESERVE_VERIFIED;
            const reserveVerified = await this.verifyReserve(request.reserveId, request.amount);
            if (!reserveVerified) {
                throw new Error('Reserve verification failed');
            }

            // Step 2: Mint on Fabric
            result.status = TokenizationStatus.FABRIC_MINTING;
            const fabricResult = await this.mintOnFabric(request);
            result.fabricTokenId = fabricResult.tokenId;
            result.fabricTxHash = fabricResult.txHash;
            result.status = TokenizationStatus.FABRIC_MINTED;

            // Step 3: Bridge to Besu via Cacti
            result.status = TokenizationStatus.BESU_MINTING;
            const besuResult = await this.mintOnBesu(request, fabricResult);
            result.besuTokenAddress = besuResult.tokenAddress;
            result.besuTxHash = besuResult.txHash;
            result.status = TokenizationStatus.BESU_MINTED;

            // Step 4: Generate settlement file
            result.settlementFile = await this.generateSettlementFile(besuResult.txHash, request);

            // Step 5: Confirm settlement
            result.status = TokenizationStatus.SETTLEMENT_CONFIRMED;

            // Step 6: Regulatory reporting
            result.status = TokenizationStatus.REGULATORY_REPORTED;
            await this.reportToRegulators(result, request);

            result.status = TokenizationStatus.COMPLETED;
            return result;
        } catch (error: any) {
            result.status = TokenizationStatus.FAILED;
            throw new Error(`Tokenization failed: ${error.message}`);
        }
    }

    /**
     * Verify reserves on Fabric
     */
    private async verifyReserve(reserveId: string, amount: string): Promise<boolean> {
        try {
            // Call Fabric chaincode via Cacti
            const response = await fetch(`${this.cactiApiUrl}/api/v1/plugins/ledger-connector/fabric/invoke`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    chaincodeId: 'reserve-manager',
                    functionName: 'VerifyReserve',
                    args: [reserveId, amount]
                })
            });

            if (!response.ok) {
                return false;
            }

            const result = await response.json();
            return result.success === true;
        } catch (error) {
            console.error('Reserve verification error:', error);
            return false;
        }
    }

    /**
     * Mint tokenized asset on Fabric
     */
    private async mintOnFabric(request: TokenizationRequest): Promise<{ tokenId: string; txHash: string }> {
        const tokenId = `EUR-T-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;

        const mintRequest = {
            tokenId,
            underlyingAsset: request.underlyingAsset,
            amount: request.amount,
            issuer: request.issuer,
            reserveProof: request.reserveId,
            regulatoryFlags: request.regulatoryFlags || {}
        };

        // Call Fabric chaincode via Cacti
        const response = await fetch(`${this.cactiApiUrl}/api/v1/plugins/ledger-connector/fabric/invoke`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                chaincodeId: 'tokenized-asset',
                functionName: 'MintToken',
                args: [JSON.stringify(mintRequest)]
            })
        });

        if (!response.ok) {
            throw new Error('Fabric minting failed');
        }

        const result = await response.json();
        return {
            tokenId,
            txHash: result.txId
        };
    }

    /**
     * Mint ERC-20 token on Besu via Cacti bridge
     */
    private async mintOnBesu(
        request: TokenizationRequest,
        fabricResult: { tokenId: string; txHash: string }
    ): Promise<{ tokenAddress: string; txHash: string }> {
        // Get or deploy token contract
        let tokenAddress = await this.tokenRegistry.getTokenByFabricId(fabricResult.tokenId);
        
        if (tokenAddress === ethers.ZeroAddress) {
            // Token not registered, need to deploy
            // This would typically be done via FireFly or deployment script
            throw new Error('Token contract not found. Deploy TokenizedEUR first.');
        }

        // Create Fabric attestation
        const attestation = {
            fabricTxHash: fabricResult.txHash,
            tokenId: fabricResult.tokenId,
            amount: request.amount,
            minter: request.issuer,
            timestamp: Date.now(),
            signature: '0x' // In production, this would be a real signature
        };

        // Bridge from Fabric to Besu via Cacti
        const response = await fetch(`${this.cactiApiUrl}/api/v1/plugins/ledger-connector/bridge/transfer`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                sourceNetwork: 'fabric',
                targetNetwork: 'besu',
                sourceTxHash: fabricResult.txHash,
                targetContract: tokenAddress,
                functionName: 'mintFromFabric',
                args: [
                    request.recipient || request.issuer,
                    request.amount,
                    fabricResult.tokenId,
                    fabricResult.txHash,
                    attestation
                ]
            })
        });

        if (!response.ok) {
            throw new Error('Besu minting failed');
        }

        const result = await response.json();
        return {
            tokenAddress,
            txHash: result.txHash
        };
    }

    /**
     * Generate settlement file combining blockchain and banking data
     */
    private async generateSettlementFile(
        besuTxHash: string,
        request: TokenizationRequest
    ): Promise<SettlementFile> {
        // Get blockchain transaction data
        const tx = await this.provider.getTransaction(besuTxHash);
        if (!tx) {
            throw new Error('Transaction not found');
        }

        const receipt = await this.provider.getTransactionReceipt(besuTxHash);
        if (!receipt) {
            throw new Error('Transaction receipt not found');
        }

        // Generate traditional banking data
        const swiftReference = this.generateSwiftReference();
        const target2Code = this.generateTarget2Code();

        return {
            blockchain: {
                hash: tx.hash,
                from: tx.from,
                to: tx.to || '',
                value: tx.value.toString(),
                gas: tx.gasLimit.toString(),
                gasPrice: tx.gasPrice?.toString() || '0',
                nonce: tx.nonce.toString(),
                blockNumber: receipt.blockNumber.toString(),
                transactionIndex: receipt.index.toString(),
                input: tx.data,
                chainId: tx.chainId?.toString() || '138',
                usdtErc20: 'token' // Tokenized asset indicator
            },
            traditional: {
                swiftReference,
                target2Code,
                regulatoryFlags: request.regulatoryFlags,
                identityCode: this.generateIdentityCode(),
                permitCode: this.generatePermitCode(),
                accessCode: this.generateAccessCode()
            }
        };
    }

    /**
     * Report to regulators
     */
    private async reportToRegulators(
        result: TokenizationResult,
        request: TokenizationRequest
    ): Promise<void> {
        // In production, this would call regulatory reporting APIs
        // For now, log the event
        console.log('Regulatory reporting:', {
            requestId: request.requestId,
            amount: request.amount,
            asset: request.underlyingAsset,
            issuer: request.issuer,
            fabricTxHash: result.fabricTxHash,
            besuTxHash: result.besuTxHash
        });
    }

    /**
     * Generate SWIFT reference
     */
    private generateSwiftReference(): string {
        return `SWIFT-${Date.now()}-${Math.random().toString(36).substr(2, 9).toUpperCase()}`;
    }

    /**
     * Generate TARGET2 code
     */
    private generateTarget2Code(): string {
        return `T2-${Date.now()}`;
    }

    /**
     * Generate identity code (Indy credential reference)
     */
    private generateIdentityCode(): string {
        return `42Q GB DD GB 42FOP 36F`; // Example format
    }

    /**
     * Generate permit code
     */
    private generatePermitCode(): string {
        return `PERMIT-${Date.now()}`;
    }

    /**
     * Generate access code
     */
    private generateAccessCode(): string {
        return `ACCESS-${Date.now()}`;
    }

    /**
     * Get tokenization status
     */
    async getStatus(requestId: string): Promise<TokenizationStatus> {
        // In production, this would query FireFly or database
        // For now, return a placeholder
        return TokenizationStatus.INITIATED;
    }
}
