import React, { useMemo } from 'react';
import { OnboardingDataLegacy, SystemState, GoalPrimary, Channel, ExternalSystem } from '../types';
import { ClayCard } from './ClayCard';
import { Button } from './Button';

// Use legacy interface which has snake_case properties
type OnboardingData = OnboardingDataLegacy;
import {
  Upload,
  MessageSquare,
  Mail,
  Rocket,
  CheckCircle,
  Smartphone,
  Users,
  Target,
  BarChart3,
  Layers,
  Link2,
  Sparkles,
  BookOpen,
  ClipboardList
} from 'lucide-react';

interface DashboardProps {
  onboardingData: OnboardingData;
  systemState: SystemState;
  onSetupClick: (setupType: string) => void;
  onQuizClick: () => void;
}

interface TodoItem {
  id: string;
  title: string;
  description: string;
  icon: React.ReactNode;
  iconBgColor: string;
  iconTextColor: string;
  setupType: string;
  isCompleted: boolean;
}

export const Dashboard: React.FC<DashboardProps> = ({
  onboardingData,
  systemState,
  onSetupClick,
  onQuizClick
}) => {
  const {
    user_first_name,
    goals_selected,
    channels_selected,
    systems_to_connect,
    has_lead_source
  } = onboardingData;

  const { sms_configured, email_configured, contacts_imported } = systemState;

  // Calculate setup progress
  const progressData = useMemo(() => {
    const items: { label: string; completed: boolean }[] = [];

    if (channels_selected.includes(Channel.SMS)) {
      items.push({ label: 'SMS', completed: sms_configured });
    }
    if (channels_selected.includes(Channel.EMAIL)) {
      items.push({ label: 'Email', completed: email_configured });
    }
    if (has_lead_source) {
      items.push({ label: 'Contacts', completed: contacts_imported });
    }
    if (systems_to_connect.length > 0) {
      items.push({ label: 'Integrations', completed: false }); // Assuming integrations tracking
    }

    const completedCount = items.filter(i => i.completed).length;
    const percentage = items.length > 0 ? Math.round((completedCount / items.length) * 100) : 0;

    return { items, completedCount, percentage };
  }, [channels_selected, systems_to_connect, has_lead_source, sms_configured, email_configured, contacts_imported]);

  // Generate subtitle based on goals
  const subtitle = useMemo(() => {
    if (goals_selected.length === 0) {
      return "Let's get your CRM set up!";
    }

    const goalDescriptions: Record<string, string> = {
      [GoalPrimary.NEW_SELLER_LEADS]: 'seller leads',
      [GoalPrimary.NEW_BUYER_LEADS]: 'buyer leads',
      [GoalPrimary.GET_ORGANIZED]: 'organization',
      [GoalPrimary.FOLLOW_UP_CAMPAIGNS]: 'follow-up campaigns',
      [GoalPrimary.TRACK_METRICS]: 'tracking metrics'
    };

    const goalSummary = goals_selected
      .slice(0, 2)
      .map(g => goalDescriptions[g] || g)
      .join(' and ');

    return `Let's help you with ${goalSummary}${goals_selected.length > 2 ? ' and more' : ''}!`;
  }, [goals_selected]);

  // Build dynamic to-do items
  const todoItems: TodoItem[] = useMemo(() => {
    const items: TodoItem[] = [];

    // Goal-based to-dos
    if (goals_selected.includes(GoalPrimary.NEW_SELLER_LEADS)) {
      items.push({
        id: 'seller-leads-campaign',
        title: 'Start campaign to get new seller leads',
        description: 'Launch an automated campaign targeting potential sellers in your market.',
        icon: <Target size={28} />,
        iconBgColor: 'bg-emerald-100',
        iconTextColor: 'text-emerald-600',
        setupType: 'SELLER_CAMPAIGN',
        isCompleted: false
      });
    }

    if (goals_selected.includes(GoalPrimary.NEW_BUYER_LEADS)) {
      items.push({
        id: 'buyer-leads-campaign',
        title: 'Start campaign to get new buyer leads',
        description: 'Reach potential buyers with targeted messaging and automation.',
        icon: <Users size={28} />,
        iconBgColor: 'bg-blue-100',
        iconTextColor: 'text-blue-600',
        setupType: 'BUYER_CAMPAIGN',
        isCompleted: false
      });
    }

    if (goals_selected.includes(GoalPrimary.FOLLOW_UP_CAMPAIGNS)) {
      items.push({
        id: 'follow-up-campaigns',
        title: 'Set up follow-up campaigns',
        description: 'Create automated sequences to nurture your leads over time.',
        icon: <MessageSquare size={28} />,
        iconBgColor: 'bg-violet-100',
        iconTextColor: 'text-violet-600',
        setupType: 'FOLLOW_UP_CAMPAIGN',
        isCompleted: false
      });
    }

    if (goals_selected.includes(GoalPrimary.GET_ORGANIZED)) {
      items.push({
        id: 'configure-pipeline',
        title: 'Configure pipeline stages',
        description: 'Customize your pipeline to match your sales process.',
        icon: <Layers size={28} />,
        iconBgColor: 'bg-amber-100',
        iconTextColor: 'text-amber-600',
        setupType: 'PIPELINE_CONFIG',
        isCompleted: false
      });
    }

    if (goals_selected.includes(GoalPrimary.TRACK_METRICS)) {
      items.push({
        id: 'reporting-dashboard',
        title: 'Set up reporting dashboard',
        description: 'Track your key metrics and performance indicators.',
        icon: <BarChart3 size={28} />,
        iconBgColor: 'bg-rose-100',
        iconTextColor: 'text-rose-600',
        setupType: 'REPORTING_SETUP',
        isCompleted: false
      });
    }

    // Channel-based to-dos
    if (channels_selected.includes(Channel.SMS) && !sms_configured) {
      items.push({
        id: 'sms-setup',
        title: 'Set up SMS (A2P registration)',
        description: 'Configure your phone number and complete carrier registration to start texting.',
        icon: <Smartphone size={28} />,
        iconBgColor: 'bg-purple-100',
        iconTextColor: 'text-purple-600',
        setupType: 'SMS_SETUP',
        isCompleted: false
      });
    }

    if (channels_selected.includes(Channel.EMAIL) && !email_configured) {
      items.push({
        id: 'email-setup',
        title: 'Configure email settings',
        description: 'Connect your domain and set up authentication for deliverability.',
        icon: <Mail size={28} />,
        iconBgColor: 'bg-orange-100',
        iconTextColor: 'text-orange-600',
        setupType: 'EMAIL_SETUP',
        isCompleted: false
      });
    }

    // Systems integration to-do
    if (systems_to_connect.length > 0) {
      const systemNames = systems_to_connect.map(s => {
        const names: Record<string, string> = {
          [ExternalSystem.DIALER]: 'Dialer',
          [ExternalSystem.TRANSACTION_MANAGEMENT]: 'Transaction Management',
          [ExternalSystem.OTHER_CRM]: 'CRM',
          [ExternalSystem.MARKETING_PLATFORM]: 'Marketing Platform'
        };
        return names[s] || s;
      });

      items.push({
        id: 'connect-systems',
        title: 'Connect your systems',
        description: `Integrate with ${systemNames.join(', ')} for seamless workflow.`,
        icon: <Link2 size={28} />,
        iconBgColor: 'bg-cyan-100',
        iconTextColor: 'text-cyan-600',
        setupType: 'INTEGRATIONS',
        isCompleted: false
      });
    }

    // Lead upload to-do
    if (has_lead_source && !contacts_imported) {
      items.push({
        id: 'upload-leads',
        title: 'Upload your lead list',
        description: 'Import your existing contacts to start automating your outreach.',
        icon: <Upload size={28} />,
        iconBgColor: 'bg-teal-100',
        iconTextColor: 'text-teal-600',
        setupType: 'UPLOAD_LEADS',
        isCompleted: false
      });
    }

    return items;
  }, [goals_selected, channels_selected, systems_to_connect, has_lead_source, sms_configured, email_configured, contacts_imported]);

  // Completed items (for showing completion status)
  const completedItems = useMemo(() => {
    const items: { id: string; label: string }[] = [];

    if (channels_selected.includes(Channel.SMS) && sms_configured) {
      items.push({ id: 'sms-done', label: 'SMS configured' });
    }
    if (channels_selected.includes(Channel.EMAIL) && email_configured) {
      items.push({ id: 'email-done', label: 'Email configured' });
    }
    if (has_lead_source && contacts_imported) {
      items.push({ id: 'leads-done', label: 'Leads uploaded' });
    }

    return items;
  }, [channels_selected, has_lead_source, sms_configured, email_configured, contacts_imported]);

  return (
    <div className="max-w-4xl mx-auto py-10 px-4">
      {/* Welcome Header */}
      <div className="mb-8">
        <h1 className="text-3xl font-bold text-gray-800">
          Welcome, {user_first_name || 'there'}!
        </h1>
        <p className="text-gray-500 mt-2 text-lg">{subtitle}</p>
      </div>

      {/* Setup Progress Card */}
      <ClayCard className="mb-8">
        <div className="flex flex-col md:flex-row md:items-center md:justify-between gap-4">
          <div>
            <h2 className="text-xl font-bold text-gray-800">Setup Progress</h2>
            <p className="text-gray-500 text-sm mt-1">
              {progressData.completedCount} of {progressData.items.length} steps completed
            </p>
          </div>
          <div className="flex items-center gap-4">
            <div className="w-48 h-3 bg-gray-200 rounded-full overflow-hidden shadow-inner">
              <div
                className="h-full bg-gradient-to-r from-indigo-500 to-indigo-600 rounded-full transition-all duration-500 ease-out"
                style={{ width: `${progressData.percentage}%` }}
              />
            </div>
            <span className="text-2xl font-bold text-indigo-600">{progressData.percentage}%</span>
          </div>
        </div>

        {/* Progress indicators */}
        <div className="flex flex-wrap gap-3 mt-4">
          {progressData.items.map((item, index) => (
            <div
              key={index}
              className={`flex items-center gap-2 px-3 py-1.5 rounded-full text-sm font-medium ${
                item.completed
                  ? 'bg-green-100 text-green-700'
                  : 'bg-gray-100 text-gray-500'
              }`}
            >
              {item.completed && <CheckCircle size={14} />}
              {item.label}
            </div>
          ))}
        </div>
      </ClayCard>

      {/* Completed Items */}
      {completedItems.length > 0 && (
        <div className="space-y-3 mb-6">
          {completedItems.map(item => (
            <div
              key={item.id}
              className="p-4 rounded-2xl border-2 border-green-100 bg-green-50/50 flex items-center gap-3 text-green-700"
            >
              <CheckCircle size={20} />
              <span className="font-medium">{item.label}</span>
            </div>
          ))}
        </div>
      )}

      {/* Dynamic To-Do Items */}
      <div className="space-y-4 mb-10">
        <h2 className="text-xl font-bold text-gray-800 flex items-center gap-2">
          <ClipboardList size={24} className="text-indigo-600" />
          Your To-Do List
        </h2>

        {todoItems.length === 0 ? (
          <ClayCard className="text-center py-8">
            <div className="text-6xl mb-4">🎉</div>
            <h3 className="text-xl font-bold text-gray-800">All caught up!</h3>
            <p className="text-gray-500 mt-2">You've completed all your setup tasks.</p>
          </ClayCard>
        ) : (
          <div className="grid gap-4">
            {todoItems.map((item) => (
              <ClayCard key={item.id} className="flex flex-col gap-4">
                <div className="flex flex-col md:flex-row gap-4 items-start md:items-center">
                  <div className={`${item.iconBgColor} p-4 rounded-2xl ${item.iconTextColor} shrink-0`}>
                    {item.icon}
                  </div>
                  <div className="flex-1 min-w-0">
                    <h3 className="text-lg font-bold text-gray-800">{item.title}</h3>
                    <p className="text-gray-500 text-sm mt-1">{item.description}</p>
                  </div>
                </div>
                <div className="flex flex-col sm:flex-row gap-3">
                  <Button
                    variant="secondary"
                    fullWidth
                    onClick={() => onSetupClick(`${item.setupType}_DIY`)}
                  >
                    DIY Setup
                  </Button>
                  <Button
                    fullWidth
                    onClick={() => onSetupClick(`${item.setupType}_DFY`)}
                    className="gap-2"
                  >
                    <Sparkles size={18} />
                    Done For You
                  </Button>
                </div>
              </ClayCard>
            ))}
          </div>
        )}
      </div>

      {/* Quick Links Section */}
      <div className="space-y-4">
        <h2 className="text-xl font-bold text-gray-800">Quick Links</h2>
        <div className="grid md:grid-cols-2 gap-4">
          {/* Performance Quiz Card */}
          <ClayCard
            onClick={onQuizClick}
            className="cursor-pointer hover:transform hover:-translate-y-1 transition-all duration-300"
          >
            <div className="flex items-center gap-4">
              <div className="bg-gradient-to-br from-indigo-500 to-purple-600 p-4 rounded-2xl text-white">
                <BarChart3 size={28} />
              </div>
              <div>
                <h3 className="text-lg font-bold text-gray-800">Take the Performance Quiz</h3>
                <p className="text-gray-500 text-sm mt-1">See how you compare to your peers</p>
              </div>
            </div>
          </ClayCard>

          {/* Browse Resources Card */}
          <ClayCard
            onClick={() => onSetupClick('BROWSE_RESOURCES')}
            className="cursor-pointer hover:transform hover:-translate-y-1 transition-all duration-300"
          >
            <div className="flex items-center gap-4">
              <div className="bg-gradient-to-br from-emerald-500 to-teal-600 p-4 rounded-2xl text-white">
                <BookOpen size={28} />
              </div>
              <div>
                <h3 className="text-lg font-bold text-gray-800">Browse Resources</h3>
                <p className="text-gray-500 text-sm mt-1">Tutorials, guides, and best practices</p>
              </div>
            </div>
          </ClayCard>
        </div>
      </div>
    </div>
  );
};