// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

/**
 * @title Financial Knowledge Token (FKT)
 * @author Widi Prihartanadi System
 * @dev ERC-1155 Multi-Token Standard dengan integrasi AI Oracle
 */

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract FKT is ERC1155, Ownable {
    // === DATA STRUCTURES ===
    struct KnowledgeAsset {
        uint256 id;
        string title;
        string ipfsHash;
        uint256 timestamp;
        address creator;
        uint256 accessPrice; // dalam JKK Utility Token
        bool isCertified;
    }
    
    // === STATE VARIABLES ===
    mapping(uint256 => KnowledgeAsset) public assets;
    mapping(address => mapping(uint256 => uint256)) public accessRecords;
    uint256 public assetCount;
    
    // AI Oracle Address (Chainlink)
    address public aiOracle;
    
    // === EVENTS ===
    event AssetMinted(uint256 indexed id, address indexed creator, string ipfsHash);
    event AssetAccessed(uint256 indexed id, address indexed user, uint256 price);
    event AICertification(uint256 indexed id, bool certified, string proofHash);
    
    // === CONSTRUCTOR ===
    constructor(string memory uri) ERC1155(uri) Ownable(msg.sender) {
        assetCount = 0;
        aiOracle = 0x5FbDB2315678afecb367f032d93F642f64180aa3; // Testnet address
    }
    
    // === CORE FUNCTIONS ===
    function mintKnowledgeAsset(
        string memory title,
        string memory ipfsHash,
        uint256 accessPrice
    ) external returns (uint256) {
        assetCount++;
        uint256 newAssetId = assetCount;
        
        assets[newAssetId] = KnowledgeAsset({
            id: newAssetId,
            title: title,
            ipfsHash: ipfsHash,
            timestamp: block.timestamp,
            creator: msg.sender,
            accessPrice: accessPrice,
            isCertified: false
        });
        
        _mint(msg.sender, newAssetId, 1, "");
        emit AssetMinted(newAssetId, msg.sender, ipfsHash);
        
        // Trigger AI certification process
        _requestAICertification(newAssetId, ipfsHash);
        
        return newAssetId;
    }
    
    function accessAsset(uint256 assetId) external payable {
        require(assets[assetId].id != 0, "Asset tidak ditemukan");
        require(msg.value >= assets[assetId].accessPrice, "Pembayaran tidak cukup");
        
        // Transfer payment to creator
        payable(assets[assetId].creator).transfer(msg.value);
        
        // Record access
        accessRecords[msg.sender][assetId] = block.timestamp;
        
        // Mint access token to user (ERC-1155 dengan ID berbeda)
        uint256 accessTokenId = assetId * 1000000; // Encoding khusus
        _mint(msg.sender, accessTokenId, 1, "");
        
        emit AssetAccessed(assetId, msg.sender, msg.value);
    }
    
    // === AI INTEGRATION ===
    function _requestAICertification(uint256 assetId, string memory ipfsHash) internal {
        // Interaksi dengan AI Oracle (simulasi)
        // Dalam implementasi nyata: Chainlink Any API → AI Verification Service
        bool isCertified = _simulateAIVerification(ipfsHash);
        
        assets[assetId].isCertified = isCertified;
        
        string memory proofHash = string(abi.encodePacked(
            "AI_VERIFIED_",
            Strings.toString(block.timestamp),
            "_",
            Strings.toHexString(uint256(keccak256(abi.encodePacked(ipfsHash))), 32)
        ));
        
        emit AICertification(assetId, isCertified, proofHash);
    }
    
    function _simulateAIVerification(string memory ipfsHash) internal pure returns (bool) {
        // Simulasi: AI memverifikasi konten di IPFS
        // Return true jika hash valid (dummy logic)
        return bytes(ipfsHash).length > 0 && keccak256(bytes(ipfsHash)) != keccak256(bytes(""));
    }
    
    // === UTILITY FUNCTIONS ===
    function getAssetDetails(uint256 assetId) external view returns (
        string memory title,
        string memory ipfsHash,
        uint256 timestamp,
        address creator,
        uint256 accessPrice,
        bool isCertified,
        uint256 totalAccess
    ) {
        KnowledgeAsset memory asset = assets[assetId];
        return (
            asset.title,
            asset.ipfsHash,
            asset.timestamp,
            asset.creator,
            asset.accessPrice,
            asset.isCertified,
            balanceOf(asset.creator, assetId)
        );
    }
    
    // Update AI Oracle (hanya owner)
    function updateAIOracle(address newOracle) external onlyOwner {
        aiOracle = newOracle;
    }
}

# Verifikasi via Ethereum
curl -X GET "https://api.etherscan.io/api?module=proxy&action=eth_getTransactionByHash&txhash=0x1f2e3d4c5b6a7989a0b1c2d3e4f5a6b7c8d9e0f&apikey=YOUR_API_KEY"

# Verifikasi via IPFS
ipfs cat QmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco/widi_master_archive_v1.0.pdf

-- ============================================
-- POSTGRESQL SCHEMA: JKK CORE DATABASE
-- ============================================

-- Tabel 1: Client Master Data (Off-chain, encrypted)
CREATE TABLE clients (
    client_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    company_name VARCHAR(255) NOT NULL,
    industry_type VARCHAR(100),
    blockchain_address VARCHAR(42) UNIQUE,
    encrypted_data BYTEA, -- PGP encrypted sensitive data
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW()
);

-- Tabel 2: Financial Transactions (Hybrid storage)
CREATE TABLE transactions (
    transaction_id BIGSERIAL PRIMARY KEY,
    client_id UUID REFERENCES clients(client_id),
    amount DECIMAL(18,2) NOT NULL,
    currency VARCHAR(3) DEFAULT 'IDR',
    transaction_type VARCHAR(50), -- invoice, payment, etc
    blockchain_tx_hash VARCHAR(66), -- Ethereum hash length
    ipfs_cid VARCHAR(100), -- IPFS content identifier
    ai_verification_score DECIMAL(5,4), -- AI confidence score 0-1
    status VARCHAR(20) DEFAULT 'pending',
    created_at TIMESTAMP DEFAULT NOW(),
    
    -- Index for performance
    INDEX idx_client_status (client_id, status),
    INDEX idx_blockchain_hash (blockchain_tx_hash)
);

-- Tabel 3: AI Audit Logs
CREATE TABLE ai_audit_logs (
    log_id BIGSERIAL PRIMARY KEY,
    model_name VARCHAR(100),
    input_hash VARCHAR(64), -- SHA-256 of input
    output_result JSONB,
    confidence_score DECIMAL(5,4),
    processing_time_ms INTEGER,
    blockchain_proof VARCHAR(66), -- Merkle root of batch logs
    created_at TIMESTAMP DEFAULT NOW()
);

-- Tabel 4: Knowledge Assets (Linked to FKT Smart Contract)
CREATE TABLE knowledge_assets (
    asset_id INTEGER PRIMARY KEY,
    smart_contract_address VARCHAR(42),
    token_id INTEGER,
    title VARCHAR(500),
    description TEXT,
    ipfs_hash VARCHAR(100),
    access_price_eth DECIMAL(18,9),
    creator_address VARCHAR(42),
    is_certified BOOLEAN DEFAULT FALSE,
    certification_date TIMESTAMP,
    total_access INTEGER DEFAULT 0,
    
    FOREIGN KEY (smart_contract_address) REFERENCES smart_contracts(address)
);

-- Tabel 5: Smart Contract Registry
CREATE TABLE smart_contracts (
    address VARCHAR(42) PRIMARY KEY,
    contract_name VARCHAR(100),
    network VARCHAR(50), -- ethereum, polygon, ton
    abi JSONB,
    deployer_address VARCHAR(42),
    deployment_date TIMESTAMP,
    last_verified_block INTEGER DEFAULT 0
);