import { useState, useEffect, useRef, useCallback } from 'react';
import { motion, AnimatePresence } from "framer-motion";
import { useI18n } from '@/hooks/useI18n';
import { LanguageSelector } from '@/components/deploy/LanguageSelector';
import { DeployForm } from '@/components/deploy/DeployForm';
import { DeployProgress } from '@/components/deploy/DeployProgress';
import { DeploySuccess } from '@/components/deploy/DeploySuccess';
import { DeployError } from '@/components/deploy/DeployError';
import { CanvasRevealEffect } from '@/components/ui/sign-in-flow-1';

type DeployState = 'form' | 'progress' | 'success' | 'error';

interface ProgressData {
  progress: number;
  message: string;
}

export default function DeployPage() {
  const { lang, setLang, t } = useI18n();
  const [state, setState] = useState<DeployState>('form');
  const [stackName, setStackName] = useState('');
  const [deploymentUrl, setDeploymentUrl] = useState('');
  const [progressData, setProgressData] = useState<ProgressData>({ progress: 0, message: '' });
  const [logs, setLogs] = useState<string[]>([]);
  const [errorMessage, setErrorMessage] = useState('');
  const eventSourceRef = useRef<EventSource | null>(null);

  const handleDeploy = useCallback(async (name: string) => {
    setStackName(name);
    setProgressData({ progress: 0, message: t('initializing') });
    setLogs([]);

    try {
      const response = await fetch('/api/deploy', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ name }),
      });

      const data = await response.json();

      if (!response.ok || !data.success) {
        throw new Error(data.error || 'Deployment failed');
      }

      setDeploymentUrl(data.url);
      setState('progress');

      const es = new EventSource(`/api/status/${data.deploymentId}`);
      eventSourceRef.current = es;

      es.addEventListener('progress', (event) => {
        const eventData = JSON.parse(event.data);
        setProgressData({
          progress: eventData.progress,
          message: eventData.currentStep || eventData.message,
        });
        setLogs((prev) => [
          ...prev,
          `[${new Date().toLocaleTimeString()}] ${eventData.currentStep || eventData.message}`,
        ]);
      });

      es.addEventListener('complete', () => {
        es.close();
        setState('success');
      });

      es.addEventListener('error', (event) => {
        const eventData = (event as MessageEvent).data
          ? JSON.parse((event as MessageEvent).data)
          : { message: 'Unknown error' };
        es.close();
        setErrorMessage(eventData.message);
        setState('error');
      });

      es.onerror = () => {
        es.close();
        setErrorMessage(t('connectionLost'));
        setState('error');
      };
    } catch (err) {
      setErrorMessage(err instanceof Error ? err.message : 'Deployment failed');
      setState('error');
    }
  }, [t]);

  const handleReset = useCallback(() => {
    if (eventSourceRef.current) {
      eventSourceRef.current.close();
      eventSourceRef.current = null;
    }
    setStackName('');
    setDeploymentUrl('');
    setProgressData({ progress: 0, message: '' });
    setLogs([]);
    setErrorMessage('');
    setState('form');
  }, []);

  useEffect(() => {
    return () => {
      if (eventSourceRef.current) {
        eventSourceRef.current.close();
      }
    };
  }, []);

  return (
    <div className="min-h-screen bg-black relative flex flex-col items-center justify-center font-mono overflow-hidden">
      <div className="absolute inset-0 z-0">
        <div className="absolute inset-0">
          <CanvasRevealEffect
            animationSpeed={3}
            containerClassName="bg-black"
            colors={[[255, 255, 255], [255, 255, 255]]}
            dotSize={2}
          />
        </div>
        <div className="absolute inset-0 bg-[radial-gradient(circle_at_center,_rgba(0,0,0,1)_0%,_transparent_100%)]" />
        <div className="absolute top-0 left-0 right-0 h-1/3 bg-gradient-to-b from-black to-transparent" />
      </div>

      <LanguageSelector currentLang={lang} onLangChange={setLang} />

      <div className="relative z-10 w-full max-w-[640px] p-4 md:p-8">
        <header className="text-center mb-12">
          <motion.h1 
            initial={{ opacity: 0, y: -20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{ duration: 0.5, delay: 0.1 }}
            className="text-3xl md:text-4xl font-bold mb-4 text-white tracking-tight"
          >
            {t('title')}
          </motion.h1>
          <motion.p 
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            transition={{ duration: 0.5, delay: 0.2 }}
            className="text-gray-400"
          >
            {t('subtitle')}
          </motion.p>
        </header>

        <main className="w-full">
          <AnimatePresence mode="wait">
            {state === 'form' && (
              <motion.div
                key="form"
                initial={{ opacity: 0, y: 20 }}
                animate={{ opacity: 1, y: 0 }}
                exit={{ opacity: 0, y: -20 }}
                transition={{ duration: 0.3 }}
              >
                <DeployForm t={t} onDeploy={handleDeploy} isDeploying={false} />
              </motion.div>
            )}

            {state === 'progress' && (
              <motion.div
                key="progress"
                initial={{ opacity: 0, scale: 0.95 }}
                animate={{ opacity: 1, scale: 1 }}
                exit={{ opacity: 0, scale: 0.95 }}
                transition={{ duration: 0.3 }}
              >
                <DeployProgress
                  t={t}
                  stackName={stackName}
                  deploymentUrl={deploymentUrl}
                  progressData={progressData}
                  logs={logs}
                />
              </motion.div>
            )}

            {state === 'success' && (
              <motion.div
                key="success"
                initial={{ opacity: 0, y: 20 }}
                animate={{ opacity: 1, y: 0 }}
                exit={{ opacity: 0, y: -20 }}
                transition={{ duration: 0.3 }}
              >
                <DeploySuccess
                  t={t}
                  stackName={stackName}
                  deploymentUrl={deploymentUrl}
                  onDeployAnother={handleReset}
                />
              </motion.div>
            )}

            {state === 'error' && (
              <motion.div
                key="error"
                initial={{ opacity: 0, x: 20 }}
                animate={{ opacity: 1, x: 0 }}
                exit={{ opacity: 0, x: -20 }}
                transition={{ duration: 0.3 }}
              >
                <DeployError t={t} errorMessage={errorMessage} onTryAgain={handleReset} />
              </motion.div>
            )}
          </AnimatePresence>
        </main>

        <motion.footer 
          initial={{ opacity: 0 }}
          animate={{ opacity: 1 }}
          transition={{ duration: 0.5, delay: 0.5 }}
          className="text-center mt-12 pt-8 text-sm text-gray-600 border-t border-white/5"
        >
          <p>
            {t('poweredBy')}{' '}
            <a
              href="https://flexinit.nl"
              target="_blank"
              rel="noopener noreferrer"
              className="text-white/60 font-semibold hover:text-white hover:underline transition-colors"
            >
              FLEXINIT
            </a>{' '}
            • FlexAI Assistant
          </p>
        </motion.footer>
      </div>
    </div>
  );
}
