'use client';

import React from 'react';
import { X, Brain, TrendingUp, Database, Zap } from 'lucide-react';

interface Question {
  id: string;
  label: string;
  type: 'text' | 'select' | 'multiselect' | 'textarea';
  options?: string[];
  required?: boolean;
  placeholder?: string;
  tooltip?: string;
  agent_source?: string;
  relevance?: number;
}

interface QuestionnaireData {
  title?: string;
  subtitle?: string;
  questions?: Question[];
  fields?: Question[];
  explanation?: string;
  data_requirements?: {
    minimum_samples?: number;
    preferred_samples?: number;
    quality_factors?: Record<string, any>;
  };
  confidence_score?: number;
  ai_decision_trace?: {
    agent_sources?: string[];
  };
}

interface QuestionnaireProps {
  isOpen: boolean;
  onClose: () => void;
  onSubmit: (answers: Record<string, any>) => void;
  isSubmitting?: boolean;
  workflowId?: string;
  questionnaireData?: QuestionnaireData | null;
}

const UnifiedQuestionnaire: React.FC<QuestionnaireProps> = ({
  isOpen,
  onClose,
  onSubmit,
  isSubmitting = false,
  workflowId,
  questionnaireData
}) => {
  // Default questions if no dynamic questionnaire data
  const defaultQuestions: Question[] = [
    {
      id: "problem_domain",
      label: "What type of AI are you building?",
      type: "select",
      options: ["vision", "text", "audio", "data", "multimodal"],
      required: true,
      tooltip: "This helps us choose the right model architecture"
    },
    {
      id: "primary_objective",
      label: "What do you want your AI to do?",
      type: "textarea",
      placeholder: "Describe in simple terms, like 'identify cats in photos' or 'predict tomorrow's weather'",
      required: true
    },
    {
      id: "data_availability",
      label: "Do you have example data to train with?",
      type: "select",
      options: ["yes", "some", "no"],
      required: true
    },
    {
      id: "data_sources",
      label: "Where should we look for training data?",
      type: "multiselect",
      options: ["files", "database", "apis", "events", "logs", "auto"],
      required: true
    }
  ];

  // Use dynamic questions if available, otherwise fall back to defaults
  const questions = questionnaireData?.questions || questionnaireData?.fields || defaultQuestions;
  const title = questionnaireData?.title || "AI Model Personalization Questionnaire";
  const subtitle = questionnaireData?.subtitle || `${questions.length} questions to optimize your AI model`;
  const explanation = questionnaireData?.explanation || "Answer these questions to help us create the perfect AI solution for you.";
  const confidenceScore = questionnaireData?.confidence_score || 0.5;

  const [answers, setAnswers] = React.useState<Record<string, any>>({});
  const [isLoading, setIsLoading] = React.useState(false);

  // Initialize answers once on open or when the questions array identity changes meaningfully
  React.useEffect(() => {
    if (!isOpen) return;
    if (questions.length === 0) return;
    // Only initialize if answers are empty (avoid loops)
    if (Object.keys(answers).length === 0) {
      const initial: Record<string, any> = {};
      for (const q of questions) {
        initial[q.id] = q.type === 'multiselect' ? [] : '';
      }
      setAnswers(initial);
    }
  }, [isOpen, questions, answers]);

  // Reset when a new questionnaire arrives while modal is open
  React.useEffect(() => {
    if (!isOpen) return;
    const newQs = questionnaireData?.questions || questionnaireData?.fields;
    if (newQs && newQs.length > 0) {
      const newIds = new Set(newQs.map(q => q.id));
      const currentIds = new Set(Object.keys(answers));
      let same = newIds.size === currentIds.size && [...newIds].every(id => currentIds.has(id));
      if (!same) {
        const initial: Record<string, any> = {};
        for (const q of newQs) initial[q.id] = q.type === 'multiselect' ? [] : '';
        setAnswers(initial);
      }
    }
  }, [isOpen, questionnaireData]);

  if (!isOpen) return null;

  const handleSubmit = () => {
    // Validate required fields
    const missingRequired = questions.filter(q =>
      q.required && (!answers[q.id] || (Array.isArray(answers[q.id]) && answers[q.id].length === 0))
    );

    if (missingRequired.length > 0) {
      alert(`Please fill in all required fields: ${missingRequired.map(q => q.label).join(', ')}`);
      return;
    }

    console.log('📋 Submitting questionnaire with answers:', answers);
    onSubmit(answers);
  };

  const handleClose = () => {
    console.log('❌ Questionnaire closed by user');
    onClose();
  };

  const updateAnswer = (questionId: string, value: any) => {
    setAnswers(prev => ({
      ...prev,
      [questionId]: value
    }));
  };

  return (
    <div className="fixed inset-0 bg-black/60 backdrop-blur-sm flex items-center justify-center z-50 p-4">
      <div className="bg-gray-900 border border-gray-800 rounded-2xl shadow-2xl max-w-2xl w-full max-h-[90vh] overflow-hidden">
        {/* Header */}
        <div className="bg-gradient-to-r from-blue-600/20 via-purple-600/20 to-cyan-600/20 border-b border-gray-800 p-6">
          <div className="flex justify-between items-start">
            <div className="flex items-center space-x-3">
              <div className="p-2 bg-gradient-to-r from-blue-500 to-purple-500 rounded-lg">
                <Brain className="w-6 h-6 text-white" />
              </div>
              <div>
                <h2 className="text-2xl font-bold bg-gradient-to-r from-blue-400 to-purple-400 bg-clip-text text-transparent">
                  {title}
                </h2>
                <p className="text-gray-400 text-sm">
                  {subtitle}
                </p>
              </div>
            </div>
            <button
              onClick={handleClose}
              className="text-gray-400 hover:text-white transition-colors p-1 hover:bg-gray-800 rounded"
            >
              <X className="w-6 h-6" />
            </button>
          </div>
        </div>

        {/* Content */}
        <div className="p-6 space-y-6 overflow-y-auto max-h-[calc(90vh-200px)]">
          {/* Explanation */}
          {explanation && (
            <div className="bg-gradient-to-r from-blue-500/10 to-purple-500/10 border border-blue-500/20 rounded-lg p-4">
              <div className="flex items-start space-x-3">
                <TrendingUp className="w-5 h-5 text-blue-400 mt-0.5 flex-shrink-0" />
                <div>
                  <p className="text-gray-300 text-sm leading-relaxed">
                    {explanation}
                  </p>
                  {questionnaireData?.data_requirements && (
                    <div className="mt-3 p-3 bg-gray-800/50 rounded border border-gray-700">
                      <p className="text-xs text-gray-400 mb-2">📊 Data Requirements:</p>
                      <div className="grid grid-cols-2 gap-4 text-xs">
                        <div>
                          <span className="text-gray-500">Minimum samples:</span>
                          <span className="text-blue-400 ml-2 font-medium">
                            {questionnaireData.data_requirements.minimum_samples?.toLocaleString()}
                          </span>
                        </div>
                        <div>
                          <span className="text-gray-500">Preferred samples:</span>
                          <span className="text-green-400 ml-2 font-medium">
                            {questionnaireData.data_requirements.preferred_samples?.toLocaleString()}
                          </span>
                        </div>
                      </div>
                    </div>
                  )}
                </div>
              </div>
            </div>
          )}

          {isLoading ? (
            <div className="flex items-center justify-center py-12">
              <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-500"></div>
              <span className="ml-3 text-gray-400">Loading intelligent questionnaire...</span>
            </div>
          ) : (
            /* Dynamic Questions */
            questions.map((question, index) => (
              <div key={question.id} className="space-y-3 p-4 bg-gray-800/30 rounded-lg border border-gray-700/50 hover:border-gray-600/50 transition-colors">
                <div className="flex items-start justify-between">
                  <label className="block text-white font-medium flex items-center space-x-2">
                    <span>{question.label}</span>
                    {question.required && <span className="text-red-400">*</span>}
                    {question.agent_source && (
                      <span className={`text-xs px-2 py-1 rounded-full ${
                        question.agent_source === 'dataset_architect' ? 'bg-blue-500/20 text-blue-300' :
                        question.agent_source === 'zpe_analyzer' ? 'bg-purple-500/20 text-purple-300' :
                        'bg-gray-500/20 text-gray-300'
                      }`}>
                        {question.agent_source.replace('_', ' ')}
                      </span>
                    )}
                  </label>
                  {question.relevance && (
                    <span className="text-xs text-gray-500">
                      {(question.relevance * 100).toFixed(0)}% relevant
                    </span>
                  )}
                </div>

                {question.tooltip && (
                  <p className="text-gray-400 text-sm">{question.tooltip}</p>
                )}

                {/* Question Input */}
                {question.type === 'text' && (
                  <input
                    type="text"
                    value={answers[question.id] || ''}
                    onChange={(e) => updateAnswer(question.id, e.target.value)}
                    placeholder={question.placeholder}
                    className="w-full bg-gray-800 border border-gray-700 rounded-lg px-4 py-3 text-white placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-all"
                  />
                )}

                {question.type === 'textarea' && (
                  <textarea
                    value={answers[question.id] || ''}
                    onChange={(e) => updateAnswer(question.id, e.target.value)}
                    placeholder={question.placeholder}
                    rows={4}
                    className="w-full bg-gray-800 border border-gray-700 rounded-lg px-4 py-3 text-white placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none transition-all"
                  />
                )}

                {question.type === 'select' && question.options && (
                  <select
                    value={answers[question.id] || ''}
                    onChange={(e) => updateAnswer(question.id, e.target.value)}
                    className="w-full bg-gray-800 border border-gray-700 rounded-lg px-4 py-3 text-white focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-all"
                  >
                    <option value="">Select an option...</option>
                    {question.options.map((option, i) => (
                      <option key={i} value={option}>
                        {option.replace(/_/g, ' ').replace(/\b\w/g, l => l.toUpperCase())}
                      </option>
                    ))}
                  </select>
                )}

                {question.type === 'multiselect' && question.options && (
                  <div className="space-y-2">
                    {question.options.map((option, i) => (
                      <label key={i} className="flex items-center space-x-3 cursor-pointer p-2 hover:bg-gray-800/50 rounded transition-colors">
                        <input
                          type="checkbox"
                          value={option}
                          checked={(answers[question.id] || []).includes(option)}
                          onChange={(e) => {
                            const current = answers[question.id] || [];
                            const newValue = e.target.checked
                              ? [...current, option]
                              : current.filter((item: string) => item !== option);
                            updateAnswer(question.id, newValue);
                          }}
                          className="w-4 h-4 text-blue-600 bg-gray-800 border-gray-600 rounded focus:ring-blue-500"
                        />
                        <span className="text-white">
                          {option.replace(/_/g, ' ').replace(/\b\w/g, l => l.toUpperCase())}
                        </span>
                      </label>
                    ))}
                  </div>
                )}
              </div>
            ))
          )}
        </div>

        {/* Footer */}
        <div className="bg-gradient-to-r from-gray-900 to-gray-800 border-t border-gray-800 px-6 py-4">
          <div className="flex justify-between items-center">
            <div className="flex items-center space-x-4">
              <div className="flex items-center space-x-2">
                <Zap className="w-4 h-4 text-purple-400" />
                <p className="text-xs text-gray-400">
                  AI-powered questionnaire with {(confidenceScore * 100).toFixed(0)}% confidence
                </p>
              </div>
              {questionnaireData?.ai_decision_trace && (
                <div className="text-xs text-gray-500">
                  Powered by {questionnaireData.ai_decision_trace.agent_sources?.length || 0} AI agents
                </div>
              )}
            </div>
            <div className="flex space-x-3">
              <button
                onClick={handleClose}
                className="px-4 py-2 text-gray-400 hover:text-white hover:bg-gray-700 transition-all rounded-lg"
              >
                Skip for now
              </button>
              <button
                onClick={handleSubmit}
                disabled={isSubmitting}
                className="px-6 py-2 bg-gradient-to-r from-blue-600 via-purple-600 to-cyan-600 text-white rounded-lg font-medium hover:from-blue-700 hover:via-purple-700 hover:to-cyan-700 disabled:opacity-50 disabled:cursor-not-allowed transition-all flex items-center space-x-2"
              >
                {isSubmitting ? (
                  <>
                    <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white"></div>
                    <span>Processing...</span>
                  </>
                ) : (
                  <>
                    <Database className="w-4 h-4" />
                    <span>Generate AI Solution</span>
                  </>
                )}
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
};

export default UnifiedQuestionnaire;