'use client';

import { useMemo } from 'react';
import { X, Filter, Smile, Frown, Meh, AlertTriangle } from 'lucide-react';
import type { SentimentDataPoint, Sentiment } from '../types';
import { DOMAIN_LABELS } from '../types';
import { useReviewIQFilters } from '@/contexts/ReviewIQFilterContext';

interface SentimentPieProps {
  data: SentimentDataPoint[];
  // AI-generated insight (optional - shows when available)
  insight?: string | null;
}

// User-friendly sentiment config
const SENTIMENT_CONFIG: Record<string, {
  emoji: string;
  icon: typeof Smile;
  label: string;
  description: string;
  color: string;
  bgColor: string;
  borderColor: string;
}> = {
  'V+': {
    emoji: '😊',
    icon: Smile,
    label: 'Happy',
    description: 'Positive experiences',
    color: '#22c55e',
    bgColor: '#dcfce7',
    borderColor: '#86efac',
  },
  'V-': {
    emoji: '😟',
    icon: Frown,
    label: 'Unhappy',
    description: 'Negative experiences',
    color: '#ef4444',
    bgColor: '#fee2e2',
    borderColor: '#fca5a5',
  },
  'V0': {
    emoji: '😐',
    icon: Meh,
    label: 'Neutral',
    description: 'Factual mentions',
    color: '#eab308',
    bgColor: '#fef9c3',
    borderColor: '#fde047',
  },
  'V±': {
    emoji: '🤔',
    icon: AlertTriangle,
    label: 'Mixed',
    description: 'Both good & bad',
    color: '#f97316',
    bgColor: '#ffedd5',
    borderColor: '#fdba74',
  },
};

// Map valence codes to sentiment filter values
const valenceToSentiment: Record<string, Sentiment | null> = {
  'V+': 'positive',
  'V0': 'neutral',
  'V-': 'negative',
  'V±': 'negative', // Mixed is treated as negative for filtering
};

// Display order
const SENTIMENT_ORDER = ['V+', 'V-', 'V0', 'V±'];

/**
 * Sentiment Overview - Visual cards showing how customers feel.
 * User-friendly design with emojis and clear numbers.
 * Click to filter by sentiment.
 */
export function SentimentPie({ data, insight }: SentimentPieProps) {
  const { filters, toggleSentiment } = useReviewIQFilters();

  // Process data
  const processedData = useMemo(() => {
    const lookup = new Map<string, SentimentDataPoint>();
    let totalReviews = 0;
    let totalMentions = 0;

    data.forEach((d) => {
      lookup.set(d.valence, d);
      totalReviews += d.review_count;
      totalMentions += d.count;
    });

    // Build cards in order
    const cards = SENTIMENT_ORDER
      .filter(valence => lookup.has(valence))
      .map(valence => {
        const d = lookup.get(valence)!;
        const config = SENTIMENT_CONFIG[valence];

        return {
          valence,
          config,
          reviewCount: d.review_count,
          mentionCount: d.count,
          percentage: d.percentage,
        };
      });

    // Calculate overall sentiment score (0-100)
    const positive = lookup.get('V+');
    const negative = lookup.get('V-');
    const posCount = positive?.review_count || 0;
    const negCount = negative?.review_count || 0;
    const sentimentScore = totalReviews > 0
      ? Math.round(((posCount - negCount) / totalReviews + 1) * 50)
      : 50;

    return { cards, totalReviews, totalMentions, sentimentScore };
  }, [data]);

  const handleClick = (valence: string) => {
    const sentiment = valenceToSentiment[valence];
    if (sentiment) {
      toggleSentiment(sentiment);
    }
  };

  const isFiltering = filters.sentiment.length > 0;
  const hasDomainFilter = filters.urtDomain !== null;

  // Determine sentiment indicator color
  const getScoreColor = () => {
    if (processedData.sentimentScore >= 60) return 'text-green-600';
    if (processedData.sentimentScore >= 40) return 'text-yellow-600';
    return 'text-red-600';
  };

  const getScoreEmoji = () => {
    if (processedData.sentimentScore >= 70) return '🎉';
    if (processedData.sentimentScore >= 55) return '👍';
    if (processedData.sentimentScore >= 45) return '😐';
    if (processedData.sentimentScore >= 30) return '😕';
    return '😰';
  };

  return (
    <div
      className={`bg-white rounded-xl p-6 shadow-md transition-all ${
        isFiltering
          ? 'border-3 border-blue-500 ring-2 ring-blue-200'
          : hasDomainFilter
          ? 'border-2 border-purple-400 ring-1 ring-purple-200'
          : 'border-2 border-gray-300 hover:border-blue-400'
      }`}
    >
      <div className="flex items-center justify-between mb-4">
        <div>
          <h3 className="text-lg font-bold text-gray-900">How Customers Feel</h3>
          <p className="text-sm text-gray-500 mt-1">
            {processedData.totalReviews.toLocaleString()} reviews analyzed
          </p>
        </div>
        <div className="flex items-center gap-2">
          {hasDomainFilter && !isFiltering && (
            <span className="flex items-center gap-1 text-xs text-purple-600 bg-purple-50 px-2 py-1 rounded-full">
              <Filter className="w-3 h-3" />
              {DOMAIN_LABELS[filters.urtDomain!]}
            </span>
          )}
          {isFiltering && (
            <div className="flex items-center gap-2">
              <span className="text-xs text-blue-700 font-medium">
                {filters.sentiment.join(', ')}
              </span>
              <button
                onClick={() => {
                  filters.sentiment.forEach((s) => toggleSentiment(s));
                }}
                className="p-1 hover:bg-gray-200 rounded-full transition-colors"
                title="Clear filter"
              >
                <X className="w-4 h-4 text-gray-600" />
              </button>
            </div>
          )}
        </div>
      </div>

      {/* AI Insight (when available) */}
      {insight && (
        <div className="mb-4 p-3 bg-gradient-to-r from-purple-50 to-blue-50 rounded-lg border border-purple-200">
          <div className="flex items-start gap-2">
            <span className="text-sm">✨</span>
            <div>
              <div className="text-xs font-medium text-purple-600 mb-0.5">AI Insight</div>
              <p className="text-sm text-gray-700">{insight}</p>
            </div>
          </div>
        </div>
      )}

      {processedData.cards.length === 0 ? (
        <div className="flex items-center justify-center h-64 text-gray-500">
          No sentiment data available
        </div>
      ) : (
        <>
          {/* Overall Sentiment Score */}
          <div className="flex items-center justify-center mb-4 p-3 bg-gray-50 rounded-lg">
            <div className="text-center">
              <div className="text-3xl mb-1">{getScoreEmoji()}</div>
              <div className={`text-2xl font-bold ${getScoreColor()}`}>
                {processedData.sentimentScore}%
              </div>
              <div className="text-xs text-gray-500">Sentiment Score</div>
            </div>
          </div>

          {/* Sentiment Cards Grid */}
          <div className="grid grid-cols-2 gap-3">
            {processedData.cards.map((card) => {
              const sentiment = valenceToSentiment[card.valence];
              const isActive = sentiment && filters.sentiment.includes(sentiment);
              const Icon = card.config.icon;

              return (
                <button
                  key={card.valence}
                  onClick={() => handleClick(card.valence)}
                  className={`p-3 rounded-xl transition-all text-left ${
                    isActive
                      ? 'ring-2 ring-blue-500 ring-offset-2'
                      : 'hover:scale-105 hover:shadow-md'
                  }`}
                  style={{
                    backgroundColor: card.config.bgColor,
                    borderWidth: '2px',
                    borderColor: card.config.borderColor,
                  }}
                >
                  <div className="flex items-start justify-between">
                    <div>
                      <div className="text-2xl mb-1">{card.config.emoji}</div>
                      <div
                        className="font-bold text-sm"
                        style={{ color: card.config.color }}
                      >
                        {card.config.label}
                      </div>
                    </div>
                    <div className="text-right">
                      <div
                        className="text-xl font-bold"
                        style={{ color: card.config.color }}
                      >
                        {card.percentage.toFixed(0)}%
                      </div>
                      <div className="text-xs text-gray-600">
                        {card.reviewCount} reviews
                      </div>
                    </div>
                  </div>

                  {/* Mini progress bar */}
                  <div className="mt-2 h-1.5 bg-white/50 rounded-full overflow-hidden">
                    <div
                      className="h-full rounded-full transition-all duration-500"
                      style={{
                        width: `${card.percentage}%`,
                        backgroundColor: card.config.color,
                      }}
                    />
                  </div>
                </button>
              );
            })}
          </div>

          {/* Tip */}
          <div className="mt-4 pt-3 border-t border-gray-100 text-center text-xs text-gray-500">
            Click any card to filter reviews by sentiment
          </div>
        </>
      )}
    </div>
  );
}