import { useState, useEffect, useRef } from 'react';
import { PixelCard } from '@librechat/client';
import type { TAttachment, TFile, TAttachmentMetadata } from 'librechat-data-provider';
import Image from '~/components/Chat/Messages/Content/Image';
import ProgressText from './ProgressText';
import { cn } from '~/utils';

const IMAGE_MAX_H = 'max-h-[45vh]' as const;
const IMAGE_FULL_H = 'h-[45vh]' as const;

export default function OpenAIImageGen({
  initialProgress = 0.1,
  isSubmitting,
  toolName,
  args: _args = '',
  output,
  attachments,
}: {
  initialProgress: number;
  isSubmitting: boolean;
  toolName: string;
  args: string | Record<string, unknown>;
  output?: string | null;
  attachments?: TAttachment[];
}) {
  const [progress, setProgress] = useState(initialProgress);
  const intervalRef = useRef<NodeJS.Timeout | null>(null);

  const error =
    typeof output === 'string' && output.toLowerCase().includes('error processing tool');

  const cancelled = (!isSubmitting && initialProgress < 1) || error === true;

  let quality: 'low' | 'medium' | 'high' = 'high';

  // Parse args if it's a string
  let parsedArgs;
  try {
    parsedArgs = typeof _args === 'string' ? JSON.parse(_args) : _args;
  } catch (error) {
    console.error('Error parsing args:', error);
    parsedArgs = {};
  }

  if (parsedArgs && typeof parsedArgs.quality === 'string') {
    const q = parsedArgs.quality.toLowerCase();
    if (q === 'low' || q === 'medium' || q === 'high') {
      quality = q;
    }
  }

  const attachment = attachments?.[0];
  const {
    filepath = null,
    filename = '',
    width: imgWidth,
    height: imgHeight,
  } = (attachment as TFile & TAttachmentMetadata) || {};

  useEffect(() => {
    if (isSubmitting) {
      setProgress(initialProgress);

      if (intervalRef.current) {
        clearInterval(intervalRef.current);
      }

      let baseDuration = 20000;
      if (quality === 'low') {
        baseDuration = 10000;
      } else if (quality === 'high') {
        baseDuration = 50000;
      }
      // adding some jitter (±30% of base)
      const jitter = Math.floor(baseDuration * 0.3);
      const totalDuration = Math.floor(Math.random() * jitter) + baseDuration;
      const updateInterval = 200;
      const totalSteps = totalDuration / updateInterval;
      let currentStep = 0;

      intervalRef.current = setInterval(() => {
        currentStep++;

        if (currentStep >= totalSteps) {
          clearInterval(intervalRef.current as NodeJS.Timeout);
          setProgress(0.9);
        } else {
          const progressRatio = currentStep / totalSteps;
          let mapRatio: number;
          if (progressRatio < 0.8) {
            mapRatio = Math.pow(progressRatio, 1.1);
          } else {
            const sub = (progressRatio - 0.8) / 0.2;
            mapRatio = 0.8 + (1 - Math.pow(1 - sub, 2)) * 0.2;
          }
          const scaledProgress = 0.1 + mapRatio * 0.8;

          setProgress(scaledProgress);
        }
      }, updateInterval);
    }

    return () => {
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
      }
    };
  }, [isSubmitting, initialProgress, quality]);

  useEffect(() => {
    if (initialProgress >= 1 || cancelled) {
      setProgress(initialProgress);
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
      }
    }
  }, [initialProgress, cancelled]);

  return (
    <>
      <div className="relative my-2.5 flex size-5 shrink-0 items-center gap-2.5">
        <ProgressText progress={progress} error={cancelled} toolName={toolName} />
      </div>
      <div className={cn('relative mb-2 flex w-full max-w-lg justify-start', IMAGE_MAX_H)}>
        <div className={cn('overflow-hidden', progress < 1 ? [IMAGE_FULL_H, 'w-full'] : 'w-auto')}>
          {progress < 1 && <PixelCard variant="default" progress={progress} randomness={0.6} />}
          <Image
            width={imgWidth}
            args={parsedArgs}
            height={imgHeight}
            altText={filename}
            imagePath={filepath ?? ''}
            className={progress < 1 ? 'invisible absolute' : ''}
          />
        </div>
      </div>
    </>
  );
}