'use client';

import { useState, useEffect, useCallback } from 'react';
import { User } from '@/lib/session';
import {
  getUsageData,
  getPreferences,
  savePreferences,
  saveUsageEntry,
  shouldShowUsagePrompt,
  hasOneWeekOfData,
  calculateWeeklyAverage,
  generateQuitPlan,
  setCurrentUserId,
  UserPreferences,
  UsageEntry,
} from '@/lib/storage';
import { UserHeader } from './UserHeader';
import { SetupWizard } from './SetupWizard';
import { UsagePromptDialog } from './UsagePromptDialog';
import { UsageCalendar } from './UsageCalendar';
import { QuitPlanCard } from './QuitPlanCard';
import { StatsCard } from './StatsCard';
import { Button } from '@/components/ui/button';
import { PlusCircle } from 'lucide-react';

interface DashboardProps {
  user: User;
}

export function Dashboard({ user }: DashboardProps) {
  const [preferences, setPreferences] = useState<UserPreferences | null>(null);
  const [usageData, setUsageData] = useState<UsageEntry[]>([]);
  const [showSetup, setShowSetup] = useState(false);
  const [showUsagePrompt, setShowUsagePrompt] = useState(false);
  const [isLoading, setIsLoading] = useState(true);
  const [refreshKey, setRefreshKey] = useState(0);

  const loadData = useCallback(() => {
    // Always pass user.id explicitly to ensure correct data is loaded
    const prefs = getPreferences(user.id);
    const usage = getUsageData(user.id);
    setPreferences(prefs);
    setUsageData(usage);
    setRefreshKey(prev => prev + 1);
    return prefs;
  }, [user.id]);

  useEffect(() => {
    // Set the current user ID for all storage operations
    setCurrentUserId(user.id);

    const prefs = loadData();

    if (!prefs.hasCompletedSetup) {
      setShowSetup(true);
    } else if (shouldShowUsagePrompt()) {
      setShowUsagePrompt(true);
    }

    setIsLoading(false);
  }, [user.id, loadData]);

  const handleSetupComplete = (data: { substance: 'nicotine' | 'weed'; name: string; age: number }) => {
    const today = new Date().toISOString().split('T')[0];
    const newPrefs: UserPreferences = {
      substance: data.substance,
      trackingStartDate: today,
      hasCompletedSetup: true,
      dailyGoal: null,
      quitPlan: null,
      userName: data.name,
      userAge: data.age,
    };
    savePreferences(newPrefs, user.id);
    setPreferences(newPrefs);
    setShowSetup(false);
    setShowUsagePrompt(true);
    setRefreshKey(prev => prev + 1);
  };

  const handleUsageSubmit = (count: number) => {
    if (!preferences) {
      setShowUsagePrompt(false);
      return;
    }

    if (count > 0) {
      const today = new Date().toISOString().split('T')[0];
      saveUsageEntry({
        date: today,
        count,
        substance: preferences.substance,
      }, user.id);
    }

    setShowUsagePrompt(false);
    // Reload data and force calendar refresh
    const usage = getUsageData(user.id);
    setUsageData(usage);
    setRefreshKey(prev => prev + 1);
  };

  const handleGeneratePlan = () => {
    if (!preferences) return;

    const plan = generateQuitPlan(preferences.substance, user.id);
    const updatedPrefs = { ...preferences, quitPlan: plan };
    savePreferences(updatedPrefs, user.id);
    setPreferences(updatedPrefs);
  };

  const getDaysTracked = (): number => {
    if (!preferences?.trackingStartDate) return 0;
    const startDate = new Date(preferences.trackingStartDate);
    const today = new Date();
    return Math.floor((today.getTime() - startDate.getTime()) / (1000 * 60 * 60 * 24)) + 1;
  };

  if (isLoading) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <div className="animate-pulse text-lg text-white">Loading...</div>
      </div>
    );
  }

  return (
    <div className="min-h-screen">
      <UserHeader user={user} />

      <main className="container mx-auto px-4 py-8">
        {preferences && (
          <>
            {/* Floating Log Button */}
            <div className="fixed bottom-6 right-6 z-50">
              <Button
                size="lg"
                onClick={() => setShowUsagePrompt(true)}
                className="h-14 px-6 rounded-full shadow-lg bg-gradient-to-r from-primary to-primary/80 hover:from-primary/90 hover:to-primary/70"
              >
                <PlusCircle className="mr-2 h-5 w-5" />
                Log Puff
              </Button>
            </div>

            <div className="grid gap-6 md:grid-cols-2">
              <div className="space-y-6">
                <UsageCalendar
                  key={refreshKey}
                  usageData={usageData}
                  substance={preferences.substance}
                  onDataUpdate={loadData}
                  userId={user.id}
                />
              </div>
              <div className="space-y-6">
                <StatsCard usageData={usageData} substance={preferences.substance} />
                <QuitPlanCard
                  plan={preferences.quitPlan}
                  onGeneratePlan={handleGeneratePlan}
                  hasEnoughData={hasOneWeekOfData(preferences.substance, user.id)}
                  daysTracked={getDaysTracked()}
                  currentAverage={calculateWeeklyAverage(preferences.substance, user.id)}
                />
              </div>
            </div>
          </>
        )}
      </main>

      <SetupWizard open={showSetup} onComplete={handleSetupComplete} />

      {preferences && (
        <UsagePromptDialog
          open={showUsagePrompt}
          onClose={() => setShowUsagePrompt(false)}
          onSubmit={handleUsageSubmit}
          substance={preferences.substance}
          userId={user.id}
        />
      )}
    </div>
  );
}