"use client";

import { useState, useEffect } from "react";
import { CardResponse } from "@/lib/types/cards";
import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import { Card } from "@/components/ui/card";
import { Progress } from "@/components/ui/progress";
import { processReview, gradeCard } from "@/actions/srs";
import "./cards.css";

interface StudyCardProps {
  card: CardResponse;
  userId: number;
  onComplete: (newCard: CardResponse) => void;
  onSkip?: () => void;
}

export default function StudyCard({ card, userId, onComplete, onSkip }: StudyCardProps) {
  const [isFlipped, setIsFlipped] = useState(false);
  const [startTime, setStartTime] = useState(0);
  const [isSubmitting, setIsSubmitting] = useState(false);
  
  // Reset the timer when a new card is shown
  useEffect(() => {
    setIsFlipped(false);
    setStartTime(Date.now());
  }, [card.id]);

  // Toggle card flip
  const flipCard = () => {
    if (!isFlipped) {
      setIsFlipped(true);
    }
  };

  // Calculate time spent on card in milliseconds
  const getReviewTime = () => {
    return Date.now() - startTime;
  };

  // Handle card grading (Good/Again)
  const handleGrade = async (isCorrect: boolean) => {
    if (isSubmitting) return;
    
    setIsSubmitting(true);
    
    try {
      const result = await gradeCard(userId, card.id, isCorrect);
      
      if ('error' in result) {
        console.error("Error grading card:", result.error);
      } else {
        onComplete(result as CardResponse);
      }
    } catch (error) {
      console.error("Error processing review:", error);
    } finally {
      setIsSubmitting(false);
    }
  };

  // Handle detailed grading with accuracy level
  const handleDetailedGrade = async (accuracy: number) => {
    if (isSubmitting) return;
    
    setIsSubmitting(true);
    
    try {
      const reviewTime = getReviewTime();
      const result = await processReview(userId, card.id, accuracy, reviewTime);
      
      if ('error' in result) {
        console.error("Error processing review:", result.error);
      } else {
        onComplete(result as CardResponse);
      }
    } catch (error) {
      console.error("Error processing review:", error);
    } finally {
      setIsSubmitting(false);
    }
  };

  // Calculate progress percentage for the card
  const getProgressPercentage = () => {
    const { interval, easeFactor } = card.progress;
    // Assuming max interval is 365 days and max ease factor is 4.0
    const intervalProgress = Math.min(interval / 365, 1) * 70; // 70% weight to interval
    const easeProgress = Math.min((easeFactor - 1) / 3, 1) * 30; // 30% weight to ease factor
    return intervalProgress + easeProgress;
  };

  // Format content based on card type
  const formatCardContent = (content: string, isBack: boolean = false) => {
    // You can add more sophisticated formatting here based on card type
    return content;
  };

  // Render IPA pronunciation if available
  const renderIPA = () => {
    if (card.expression.ipa && card.expression.ipa.length > 0) {
      return (
        <div className="text-gray-500 text-sm mt-2">
          /{card.expression.ipa[0].ipa}/
        </div>
      );
    }
    return null;
  };

  // Render senses/meanings if available
  const renderSenses = () => {
    if (card.expression.senses && card.expression.senses.length > 0) {
      return (
        <div className="mt-4">
          {card.expression.senses.map((sense, index) => (
            <div key={index} className="mb-3">
              {sense.pos && <span className="text-xs font-medium text-blue-600 mr-2">{sense.pos}</span>}
              {sense.senses && sense.senses.map((subsense, i) => (
                <div key={i} className="mt-1">
                  {subsense.glosses && subsense.glosses.map((gloss, j) => (
                    <div key={j} className="text-sm">{j+1}. {gloss}</div>
                  ))}
                </div>
              ))}
            </div>
          ))}
        </div>
      );
    }
    return null;
  };

  // Show bookmarked status if applicable
  const renderBookmarked = () => {
    if (card.expression.isBookmarked) {
      return <div className="absolute top-2 right-2 text-yellow-500">★</div>;
    }
    return null;
  };

  return (
    <div className="flex flex-col items-center">
      <div className={cn("flashcard-container", { flipped: isFlipped })} onClick={flipCard}>
        <div className="flashcard">
          {/* Front of card */}
          <div className="flashcard-front">
            <Card className="w-full h-full flex flex-col justify-center items-center p-6 relative">
              {renderBookmarked()}
              <div className="text-2xl font-bold">{card.expression.spelling}</div>
              {!isFlipped && renderIPA()}
              <div className="mt-4 text-lg">{formatCardContent(card.text)}</div>
              {card.note && <div className="mt-2 text-sm text-gray-500">{card.note}</div>}
              {!isFlipped && (
                <div className="mt-6 text-sm text-gray-400">
                  Click to flip
                </div>
              )}
            </Card>
          </div>
          
          {/* Back of card */}
          <div className="flashcard-back">
            <Card className="w-full h-full flex flex-col justify-between p-6 relative">
              {renderBookmarked()}
              <div>
                <div className="text-2xl font-bold">{card.expression.spelling}</div>
                {renderIPA()}
                <div className="mt-4 text-lg">{formatCardContent(card.text, true)}</div>
                {card.note && <div className="mt-2 text-sm text-gray-500">{card.note}</div>}
                {renderSenses()}
              </div>
              
              <div className="flex flex-col mt-6">
                <div className="text-sm text-gray-500 mb-2">
                  How well did you remember this?
                </div>
                <div className="flex justify-between gap-2">
                  <Button
                    variant="destructive"
                    onClick={() => handleGrade(false)}
                    disabled={isSubmitting}
                    className="flex-1"
                  >
                    Again
                  </Button>
                  <Button
                    variant="default"
                    onClick={() => handleGrade(true)}
                    disabled={isSubmitting} 
                    className="flex-1"
                  >
                    Good
                  </Button>
                </div>
                
                {/* Optional: Detailed grading */}
                <div className="grid grid-cols-4 gap-2 mt-3">
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={() => handleDetailedGrade(0.2)}
                    disabled={isSubmitting}
                    className="text-red-500"
                  >
                    Forgot
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={() => handleDetailedGrade(0.6)}
                    disabled={isSubmitting}
                    className="text-orange-500"
                  >
                    Hard
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={() => handleDetailedGrade(0.8)}
                    disabled={isSubmitting}
                    className="text-green-500"
                  >
                    Good
                  </Button>
                  <Button
                    variant="outline"
                    size="sm"
                    onClick={() => handleDetailedGrade(1.0)}
                    disabled={isSubmitting}
                    className="text-blue-500"
                  >
                    Easy
                  </Button>
                </div>
              </div>
            </Card>
          </div>
        </div>
      </div>
      
      {/* Progress bar */}
      <div className="w-full mt-4">
        <Progress value={getProgressPercentage()} className="h-2" />
        <div className="flex justify-between text-xs text-gray-500 mt-1">
          <span>Interval: {card.progress.interval} days</span>
          <span>Ease: {card.progress.easeFactor.toFixed(1)}</span>
        </div>
      </div>
      
      {/* Skip button */}
      {onSkip && (
        <Button
          variant="ghost"
          onClick={onSkip}
          className="mt-4"
          disabled={isSubmitting}
        >
          Skip
        </Button>
      )}
    </div>
  );
}