import React, { useState } from 'react';
import { Pet, AnalysisResult, PetTimelineItem, DictionarySignal, TalkBackLog } from './types';
import { INITIAL_PET_LUNA, INITIAL_PET_MILO, INITIAL_TIMELINE_LUNA, INITIAL_DICTIONARY_LUNA } from './data/seedData';
import { Navigation } from './components/Navigation';
import { LandingPage } from './components/LandingPage';
import { OnboardingFlow } from './components/OnboardingFlow';
import { LiveListenScreen } from './components/LiveListenScreen';
import { TalkBackScreen } from './components/TalkBackScreen';
import { PetTimeline } from './components/PetTimeline';
import { InsightsScreen } from './components/InsightsScreen';
import { AuthPage } from './components/AuthPage';
import { useAuth } from './context/AuthContext';

export default function App() {
  const { user, isLoading, logout } = useAuth();
  const [pets, setPets] = useState<Pet[]>([INITIAL_PET_LUNA, INITIAL_PET_MILO]);
  const [selectedPetId, setSelectedPetId] = useState<string>(INITIAL_PET_LUNA.id);
  const [currentView, setCurrentView] = useState<'landing' | 'onboarding' | 'listen' | 'talkback' | 'timeline' | 'insights'>('landing');

  const [timelineItems, setTimelineItems] = useState<PetTimelineItem[]>(INITIAL_TIMELINE_LUNA);
  const [dictionarySignals, setDictionarySignals] = useState<DictionarySignal[]>(INITIAL_DICTIONARY_LUNA);

  const selectedPet = pets.find(p => p.id === selectedPetId) || pets[0];

  // Show loading spinner while checking auth
  if (isLoading) {
    return (
      <div className="min-h-screen bg-[#F9F7F2] flex items-center justify-center">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-[#F08C7D]"></div>
      </div>
    );
  }

  // Show auth page if not authenticated
  if (!user) {
    return <AuthPage />;
  }

  // Callback when analysis completes from LiveListenScreen
  const handleAnalysisComplete = (result: AnalysisResult) => {
    const newTimelineItem: PetTimelineItem = {
      id: `tl_${Date.now()}`,
      petId: result.petId,
      type: 'interpretation',
      title: result.primaryIntent.title,
      description: result.reasoning.summary,
      timestamp: result.timestamp,
      intentCategory: result.primaryIntent.category,
      confidence: result.primaryIntent.confidence,
      feedbackStatus: 'pending',
      zoneName: result.zoneName
    };

    setTimelineItems(prev => [newTimelineItem, ...prev]);
  };

  // Callback when pet model updates from training
  const handleUpdatePet = (updatedPet: Pet) => {
    setPets(prev => prev.map(p => p.id === updatedPet.id ? updatedPet : p));
  };

  // Callback when Talk Back reaction is logged
  const handleLogTalkBackReaction = (log: TalkBackLog) => {
    const newTimelineItem: PetTimelineItem = {
      id: `tl_tb_${Date.now()}`,
      petId: log.petId,
      type: 'talk_back',
      title: `Played "${log.messageLabel}" Tone`,
      description: `Pet reaction observed: ${log.petReaction ? log.petReaction.replace('_', ' ') : 'played'}`,
      timestamp: log.timestamp
    };

    setTimelineItems(prev => [newTimelineItem, ...prev]);
  };

  // Callback when manual event is added
  const handleAddManualEvent = (event: PetTimelineItem) => {
    setTimelineItems(prev => [event, ...prev]);
  };

  // Callback when onboarding completes
  const handleCompleteOnboarding = (newPet: Pet) => {
    setPets(prev => [...prev, newPet]);
    setSelectedPetId(newPet.id);
    setCurrentView('listen');
  };

  // Callback to reset pet ML model
  const handleResetPetModel = () => {
    setPets(prev => prev.map(p => {
      if (p.id === selectedPetId) {
        return { ...p, confirmedSampleCount: 0, overallAccuracy: 75 };
      }
      return p;
    }));
    alert(`${selectedPet.name}'s profile memory has been reset.`);
  };

  // Callback to delete pet account
  const handleDeletePetAccount = () => {
    const remainingPets = pets.filter(p => p.id !== selectedPetId);
    if (remainingPets.length > 0) {
      setPets(remainingPets);
      setSelectedPetId(remainingPets[0].id);
      setCurrentView('landing');
    } else {
      // Re-seed Luna if all pets deleted
      setPets([INITIAL_PET_LUNA]);
      setSelectedPetId(INITIAL_PET_LUNA.id);
      setCurrentView('landing');
    }
  };

  return (
    <div className="min-h-screen bg-[#F9F7F2] text-[#1A2A40] font-sans antialiased selection:bg-[#F08C7D]/30 selection:text-[#1A2A40]">
      
      {/* Global Responsive Navigation Header & Bottom Bar */}
      <Navigation
        currentView={currentView}
        setCurrentView={setCurrentView}
        pets={pets}
        selectedPet={selectedPet}
        setSelectedPetId={setSelectedPetId}
        onOpenAddPet={() => setCurrentView('onboarding')}
      />

      {/* Main Content View Switcher */}
      <main className="max-w-5xl mx-auto px-4 py-6 sm:py-8">
        {currentView === 'landing' && (
          <LandingPage
            selectedPet={selectedPet}
            onStartListen={() => setCurrentView('listen')}
            onStartOnboarding={() => setCurrentView('onboarding')}
          />
        )}

        {currentView === 'onboarding' && (
          <OnboardingFlow
            onComplete={handleCompleteOnboarding}
            onCancel={() => setCurrentView('landing')}
          />
        )}

        {currentView === 'listen' && (
          <LiveListenScreen
            selectedPet={selectedPet}
            onAnalysisComplete={handleAnalysisComplete}
            onUpdatePet={handleUpdatePet}
          />
        )}

        {currentView === 'talkback' && (
          <TalkBackScreen
            selectedPet={selectedPet}
            onLogTalkBackReaction={handleLogTalkBackReaction}
          />
        )}

        {currentView === 'timeline' && (
          <PetTimeline
            selectedPet={selectedPet}
            timelineItems={timelineItems}
            onAddManualEvent={handleAddManualEvent}
          />
        )}

        {currentView === 'insights' && (
          <InsightsScreen
            selectedPet={selectedPet}
            dictionarySignals={dictionarySignals}
            onResetPetModel={handleResetPetModel}
            onDeletePetAccount={handleDeletePetAccount}
          />
        )}
      </main>

      {/* Footer */}
      <footer className="border-t border-[#E5DFD3] py-8 bg-[#F4EFEC]/60 text-center text-xs text-[#5A6E85] space-y-2">
        <div className="max-w-4xl mx-auto px-4 flex flex-col sm:flex-row items-center justify-between gap-4">
          <div className="flex items-center gap-2">
            <span className="font-serif font-bold text-[#1A2A40] text-sm tracking-tight">PetTalk</span>
            <span>• Probabilistic AI Pet Behavioral Interpretation</span>
          </div>
          <div className="flex items-center gap-4 text-[#5A6E85]">
            <button onClick={() => setCurrentView('landing')} className="hover:text-[#1A2A40] transition-colors cursor-pointer">About</button>
            <button onClick={() => setCurrentView('insights')} className="hover:text-[#1A2A40] transition-colors cursor-pointer">Privacy & Data</button>
            <button onClick={() => setCurrentView('onboarding')} className="hover:text-[#1A2A40] transition-colors cursor-pointer">Add Pet</button>
            <button onClick={logout} className="hover:text-[#F08C7D] transition-colors cursor-pointer font-semibold">
              Sign Out ({user?.username})
            </button>
          </div>
        </div>
      </footer>

    </div>
  );
}