'use client'

import React, { useState } from 'react'
import BN from 'bn.js';
import Big from 'big.js';
import dynamic from 'next/dynamic'

interface AIServiceCardProps {
  title: string
  description: string
  isWalletConnected: boolean
  onGenerate: (prompt: string) => Promise<{ imageUrl?: string, transactionSignature?: string, error?: string }>
  priceMTM: BN
}

interface GenerationState {
  loading: boolean
  processing: boolean
  imageUrl: string | null
  transactionSignature: string | null
  error: string | null
}

const baseUnitToWholeNumber = (value: BN, decimals: number): string => {
  const bigValue = new Big(value.toString());
  const factor = new Big(10).pow(decimals);

  return bigValue.div(factor).round(0, Big.roundUp).toFixed(0);
}

const AIServiceCard: React.FC<AIServiceCardProps> = ({
  title,
  description,
  isWalletConnected,
  onGenerate,
  priceMTM
}) => {
  const [inputText, setInputText] = useState<string>('')
  const [generationState, setGenerationState] = useState<GenerationState>({
    loading: false,
    processing: false,
    imageUrl: null,
    transactionSignature: null,
    error: null,
  })

  const handleGenerate = async (): Promise<void> => {
    if (!inputText || !isWalletConnected) return

    setGenerationState({
      ...generationState,
      loading: true,
      error: null,
    })

    try {
      const result = await onGenerate(inputText)

      if (result.error) {
        setGenerationState({
          ...generationState,
          loading: false,
          error: result.error,
        })
        // Reload the page to get latest prices
        setTimeout(() => {
          window.location.reload();
        }, 3000);

        return
      }

      if (result.imageUrl && result.transactionSignature) {
        setGenerationState({
          loading: false,
          processing: false,
          imageUrl: result.imageUrl,
          transactionSignature: result.transactionSignature,
          error: null,
        })
      } else {
        throw new Error('No image URL received')
      }
    } catch (error) {
      setGenerationState({
        ...generationState,
        loading: false,
        error: error instanceof Error ? error.message : 'Generation failed',
      })
    }
  }

  const generateTwitterShareUrl = (imageUrl: string, transactionSignature: string): string => {
    const baseUrl = window.location.href;
    const cid = imageUrl.split("/image/")[1];
    const memePageUrl = `${baseUrl}memes/${cid}`;

    const tweetText = `Check out this meme that I generated! \n TX Hash: '${transactionSignature}' \n @${process.env.NEXT_PUBLIC_ACCOUNT_HANDLE} \n`;

    return `https://twitter.com/intent/tweet?text=${encodeURIComponent(tweetText)}&url=${encodeURIComponent(memePageUrl)}`;
  };

  return (
    <div className="w-full bg-gray-800/50 backdrop-blur-lg rounded-2xl shadow-xl border border-gray-700/50 mb-8">
      <div className="p-6">
        <div className="mb-4">
          <h2 className="text-2xl font-bold text-transparent bg-clip-text bg-gradient-to-r from-green-400 to-emerald-600">
            {title}
          </h2>
          <p className="text-gray-400 mt-2">{description}</p>
          <div className="mt-2 inline-block px-3 py-1 bg-green-500/20 rounded-full text-green-300 text-sm">
            Cost: {priceMTM ? baseUnitToWholeNumber(priceMTM, 6) : '...'} MTM
          </div>
        </div>

        <div className="space-y-4">
          <textarea
            value={inputText}
            onChange={(e) => setInputText(e.target.value)}
            placeholder="Enter your prompt here..."
            disabled={!isWalletConnected}
            className="w-full bg-gray-900/50 text-gray-100 border border-gray-700 rounded-xl p-4
                     placeholder-gray-500 focus:border-green-500 focus:ring-2 focus:ring-green-500/20
                     focus:outline-none min-h-[120px] transition-all duration-200
                     disabled:opacity-50 disabled:cursor-not-allowed"
            rows={4}
          />
          <button
            onClick={handleGenerate}
            disabled={!isWalletConnected || generationState.loading || !inputText}
            className="w-full bg-gradient-to-r from-green-500 to-emerald-500 hover:from-green-600
                     hover:to-emerald-600 text-white font-semibold py-4 px-6 rounded-xl
                     transition-all duration-200 shadow-lg hover:shadow-green-500/25
                     disabled:opacity-50 disabled:cursor-not-allowed disabled:hover:shadow-none"
          >
            {generationState.loading ? 'Processing...' : `Pay ${priceMTM ? baseUnitToWholeNumber(priceMTM, 6) : '...'} MTM & Generate`}
          </button>
        </div>

        {generationState.error && (
          <div className="mt-4 bg-red-900/20 border border-red-500/20 text-red-400 px-4 py-3 rounded-xl text-center">
            {generationState.error}
          </div>
        )}

        {generationState.imageUrl && generationState.transactionSignature && (
          <div className="mt-4">
            <img
              src={generationState.imageUrl}
              alt="Generated content"
              className="w-full h-auto rounded-xl shadow-2xl"
            />
            <div className="mt-4 text-center">
              <a
                href={generateTwitterShareUrl(generationState.imageUrl, generationState.transactionSignature)}
                target="_blank"
                rel="noopener noreferrer"
                className="inline-block w-full bg-blue-500 hover:bg-blue-600 text-white font-semibold py-4 px-6 rounded-xl transition-all duration-200 shadow-lg hover:shadow-blue-500/25"
              >
                Share on Twitter
              </a>
            </div>
          </div>
        )}
      </div>
    </div>
  )
}

export default dynamic(() => Promise.resolve(AIServiceCard), {
  ssr: false
})