/**
 * Chain Management Dashboard
 * Admin UI for managing all supported chains, adapters, and deployments
 */

import { useState, useEffect } from 'react';
import { useAccount } from 'wagmi';
import { ethers } from 'ethers';
import toast from 'react-hot-toast';

interface ChainMetadata {
    chainId: number;
    chainIdentifier: string;
    chainType: string;
    adapter: string;
    isActive: boolean;
    explorerUrl: string;
    minConfirmations: number;
    avgBlockTime: number;
}

export default function ChainManagementDashboard() {
    const { address, isConnected } = useAccount();
    const [chains, setChains] = useState<ChainMetadata[]>([]);
    const [loading, setLoading] = useState(true);
    const [selectedChain, setSelectedChain] = useState<string>('');

    useEffect(() => {
        if (isConnected) {
            loadChains();
        }
    }, [isConnected, address]);

    const loadChains = async () => {
        try {
            setLoading(true);
            // TODO: Connect to ChainRegistry contract
            // const provider = new ethers.JsonRpcProvider(process.env.NEXT_PUBLIC_RPC_URL);
            // const registry = new ethers.Contract(REGISTRY_ADDRESS, REGISTRY_ABI, provider);
            // const [evmChainIds, evmChains] = await registry.getAllEVMChains();
            // const [nonEvmIds, nonEvmChains] = await registry.getAllNonEVMChains();
            
            // Mock data for now
            setChains([
                {
                    chainId: 138,
                    chainIdentifier: 'EVM-138',
                    chainType: 'EVM',
                    adapter: '0x...',
                    isActive: true,
                    explorerUrl: 'https://explorer.d-bis.org',
                    minConfirmations: 12,
                    avgBlockTime: 2
                },
                {
                    chainId: 50,
                    chainIdentifier: 'EVM-50',
                    chainType: 'XDC',
                    adapter: '0x...',
                    isActive: true,
                    explorerUrl: 'https://explorer.xdc.network',
                    minConfirmations: 12,
                    avgBlockTime: 2
                }
            ]);
        } catch (error: any) {
            toast.error(`Failed to load chains: ${error.message}`);
        } finally {
            setLoading(false);
        }
    };

    const toggleChain = async (chainId: number, chainIdentifier: string, currentStatus: boolean) => {
        try {
            // TODO: Call ChainRegistry.setChainActive()
            toast.success(`Chain ${currentStatus ? 'disabled' : 'enabled'}`);
            loadChains();
        } catch (error: any) {
            toast.error(`Failed to toggle chain: ${error.message}`);
        }
    };

    if (!isConnected) {
        return (
            <div className="p-6 bg-white/10 rounded-xl">
                <p className="text-white/70">Please connect your wallet to manage chains.</p>
            </div>
        );
    }

    return (
        <div className="space-y-6">
            <div className="bg-black/20 rounded-xl p-6 border border-white/10">
                <h2 className="text-xl font-bold text-white mb-4">Chain Management</h2>
                
                {loading ? (
                    <div className="text-white/70">Loading chains...</div>
                ) : (
                    <div className="space-y-4">
                        {chains.map((chain) => (
                            <div
                                key={chain.chainId || chain.chainIdentifier}
                                className="bg-white/5 rounded-lg p-4 flex items-center justify-between"
                            >
                                <div>
                                    <h3 className="text-white font-semibold">
                                        {chain.chainIdentifier} ({chain.chainType})
                                    </h3>
                                    <p className="text-white/70 text-sm">
                                        Adapter: {chain.adapter.slice(0, 10)}...
                                    </p>
                                    <p className="text-white/70 text-sm">
                                        Explorer: <a href={chain.explorerUrl} target="_blank" rel="noopener noreferrer" className="text-blue-400 hover:underline">{chain.explorerUrl}</a>
                                    </p>
                                </div>
                                <div className="flex items-center gap-4">
                                    <span className={`px-3 py-1 rounded-full text-sm ${
                                        chain.isActive
                                            ? 'bg-green-500/20 text-green-200'
                                            : 'bg-red-500/20 text-red-200'
                                    }`}>
                                        {chain.isActive ? 'Active' : 'Inactive'}
                                    </span>
                                    <button
                                        onClick={() => toggleChain(chain.chainId, chain.chainIdentifier, chain.isActive)}
                                        className={`px-4 py-2 rounded-lg font-semibold transition-colors ${
                                            chain.isActive
                                                ? 'bg-red-600 hover:bg-red-700 text-white'
                                                : 'bg-green-600 hover:bg-green-700 text-white'
                                        }`}
                                    >
                                        {chain.isActive ? 'Disable' : 'Enable'}
                                    </button>
                                </div>
                            </div>
                        ))}
                    </div>
                )}
            </div>

            <div className="bg-black/20 rounded-xl p-6 border border-white/10">
                <h3 className="text-lg font-bold text-white mb-4">Add New Chain</h3>
                <div className="space-y-4">
                    <select
                        value={selectedChain}
                        onChange={(e) => setSelectedChain(e.target.value)}
                        className="w-full px-4 py-2 bg-white/10 border border-white/20 rounded-lg text-white"
                    >
                        <option value="">Select chain to add...</option>
                        <option value="polygon">Polygon</option>
                        <option value="arbitrum">Arbitrum</option>
                        <option value="optimism">Optimism</option>
                        <option value="base">Base</option>
                        <option value="avalanche">Avalanche</option>
                        <option value="bsc">BSC</option>
                        <option value="ethereum">Ethereum Mainnet</option>
                    </select>
                    <button
                        onClick={() => toast.info('Deployment feature coming soon')}
                        className="w-full px-4 py-2 bg-blue-600 hover:bg-blue-700 text-white rounded-lg font-semibold"
                    >
                        Deploy Chain Adapter
                    </button>
                </div>
            </div>
        </div>
    );
}