// ================================================================
// frontend/src/pages/app/NewDashboardPage.tsx
// ================================================================
/**
 * JTBD-Aligned Dashboard Page
 *
 * Complete redesign based on Jobs To Be Done methodology.
 * Focused on answering: "What requires my attention right now?"
 *
 * Key principles:
 * - Automation-first (show what system did)
 * - Action-oriented (prioritize tasks)
 * - Progressive disclosure (show 20% that matters 80%)
 * - Mobile-first (one-handed operation)
 * - Trust-building (explain system reasoning)
 */

import React, { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import { RefreshCw, ExternalLink, Plus, Sparkles } from 'lucide-react';
import { useTranslation } from 'react-i18next';
import { useTenant } from '../../stores/tenant.store';
import {
  useBakeryHealthStatus,
  useOrchestrationSummary,
  useActionQueue,
  useProductionTimeline,
  useInsights,
  useApprovePurchaseOrder,
  useStartProductionBatch,
  usePauseProductionBatch,
} from '../../api/hooks/newDashboard';
import { useRejectPurchaseOrder } from '../../api/hooks/purchase-orders';
import { HealthStatusCard } from '../../components/dashboard/HealthStatusCard';
import { ActionQueueCard } from '../../components/dashboard/ActionQueueCard';
import { OrchestrationSummaryCard } from '../../components/dashboard/OrchestrationSummaryCard';
import { ProductionTimelineCard } from '../../components/dashboard/ProductionTimelineCard';
import { InsightsGrid } from '../../components/dashboard/InsightsGrid';
import { PurchaseOrderDetailsModal } from '../../components/dashboard/PurchaseOrderDetailsModal';
import { UnifiedAddWizard } from '../../components/domain/unified-wizard';
import type { ItemType } from '../../components/domain/unified-wizard';
import { useDemoTour, shouldStartTour, clearTourStartPending } from '../../features/demo-onboarding';

export function NewDashboardPage() {
  const navigate = useNavigate();
  const { t } = useTranslation(['dashboard', 'common']);
  const { currentTenant } = useTenant();
  const tenantId = currentTenant?.id || '';
  const { startTour } = useDemoTour();
  const isDemoMode = localStorage.getItem('demo_mode') === 'true';

  // Unified Add Wizard state
  const [isAddWizardOpen, setIsAddWizardOpen] = useState(false);
  const [addWizardError, setAddWizardError] = useState<string | null>(null);

  // PO Details Modal state
  const [selectedPOId, setSelectedPOId] = useState<string | null>(null);
  const [isPOModalOpen, setIsPOModalOpen] = useState(false);

  // Data fetching
  const {
    data: healthStatus,
    isLoading: healthLoading,
    refetch: refetchHealth,
  } = useBakeryHealthStatus(tenantId);

  const {
    data: orchestrationSummary,
    isLoading: orchestrationLoading,
    refetch: refetchOrchestration,
  } = useOrchestrationSummary(tenantId);

  const {
    data: actionQueue,
    isLoading: actionQueueLoading,
    refetch: refetchActionQueue,
  } = useActionQueue(tenantId);

  const {
    data: productionTimeline,
    isLoading: timelineLoading,
    refetch: refetchTimeline,
  } = useProductionTimeline(tenantId);

  const {
    data: insights,
    isLoading: insightsLoading,
    refetch: refetchInsights,
  } = useInsights(tenantId);

  // Mutations
  const approvePO = useApprovePurchaseOrder();
  const rejectPO = useRejectPurchaseOrder();
  const startBatch = useStartProductionBatch();
  const pauseBatch = usePauseProductionBatch();

  // Handlers
  const handleApprove = async (actionId: string) => {
    try {
      await approvePO.mutateAsync({ tenantId, poId: actionId });
      // Refetch to update UI
      refetchActionQueue();
      refetchHealth();
    } catch (error) {
      console.error('Error approving PO:', error);
    }
  };

  const handleReject = async (actionId: string, reason: string) => {
    try {
      await rejectPO.mutateAsync({ tenantId, poId: actionId, reason });
      // Refetch to update UI
      refetchActionQueue();
      refetchHealth();
    } catch (error) {
      console.error('Error rejecting PO:', error);
    }
  };

  const handleViewDetails = (actionId: string) => {
    // Open modal to show PO details
    setSelectedPOId(actionId);
    setIsPOModalOpen(true);
  };

  const handleModify = (actionId: string) => {
    // Navigate to procurement page for modification
    navigate(`/app/operations/procurement`);
  };

  const handleStartBatch = async (batchId: string) => {
    try {
      await startBatch.mutateAsync({ tenantId, batchId });
      refetchTimeline();
      refetchHealth();
    } catch (error) {
      console.error('Error starting batch:', error);
    }
  };

  const handlePauseBatch = async (batchId: string) => {
    try {
      await pauseBatch.mutateAsync({ tenantId, batchId });
      refetchTimeline();
      refetchHealth();
    } catch (error) {
      console.error('Error pausing batch:', error);
    }
  };

  const handleRefreshAll = () => {
    refetchHealth();
    refetchOrchestration();
    refetchActionQueue();
    refetchTimeline();
    refetchInsights();
  };

  const handleAddWizardComplete = (itemType: ItemType, data?: any) => {
    console.log('Item created:', itemType, data);
    // Refetch relevant data based on what was added
    handleRefreshAll();
  };

  // Keyboard shortcut for Quick Add (Cmd/Ctrl + K)
  useEffect(() => {
    const handleKeyDown = (event: KeyboardEvent) => {
      // Check for Cmd+K (Mac) or Ctrl+K (Windows/Linux)
      if ((event.metaKey || event.ctrlKey) && event.key === 'k') {
        event.preventDefault();
        setIsAddWizardOpen(true);
      }
    };

    window.addEventListener('keydown', handleKeyDown);
    return () => window.removeEventListener('keydown', handleKeyDown);
  }, []);

  // Demo tour auto-start logic
  useEffect(() => {
    console.log('[Dashboard] Demo mode:', isDemoMode);
    console.log('[Dashboard] Should start tour:', shouldStartTour());
    console.log('[Dashboard] SessionStorage demo_tour_should_start:', sessionStorage.getItem('demo_tour_should_start'));
    console.log('[Dashboard] SessionStorage demo_tour_start_step:', sessionStorage.getItem('demo_tour_start_step'));

    // Check if there's a tour intent from redirection (higher priority)
    const shouldStartFromRedirect = sessionStorage.getItem('demo_tour_should_start') === 'true';
    const redirectStartStep = parseInt(sessionStorage.getItem('demo_tour_start_step') || '0', 10);

    if (isDemoMode && (shouldStartTour() || shouldStartFromRedirect)) {
      console.log('[Dashboard] Starting tour in 1.5s...');
      const timer = setTimeout(() => {
        console.log('[Dashboard] Executing startTour()');
        if (shouldStartFromRedirect) {
          // Start tour from the specific step that was intended
          startTour(redirectStartStep);
          // Clear the redirect intent
          sessionStorage.removeItem('demo_tour_should_start');
          sessionStorage.removeItem('demo_tour_start_step');
        } else {
          // Start tour normally (from beginning or resume)
          startTour();
          clearTourStartPending();
        }
      }, 1500);

      return () => clearTimeout(timer);
    }
  }, [isDemoMode, startTour]);

  return (
    <div className="min-h-screen pb-20 md:pb-8" style={{ backgroundColor: 'var(--bg-secondary)' }}>
      {/* Mobile-optimized container */}
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-6">
        {/* Header */}
        <div className="flex items-center justify-between mb-6">
          <div>
            <h1 className="text-3xl md:text-4xl font-bold" style={{ color: 'var(--text-primary)' }}>{t('dashboard:title')}</h1>
            <p className="mt-1" style={{ color: 'var(--text-secondary)' }}>{t('dashboard:subtitle')}</p>
          </div>

          {/* Action Buttons */}
          <div className="flex items-center gap-3">
            <button
              onClick={handleRefreshAll}
              className="flex items-center gap-2 px-4 py-2 rounded-lg font-semibold transition-colors duration-200"
              style={{
                backgroundColor: 'var(--bg-primary)',
                borderColor: 'var(--border-primary)',
                border: '1px solid',
                color: 'var(--text-secondary)'
              }}
            >
              <RefreshCw className="w-5 h-5" />
              <span className="hidden sm:inline">{t('common:actions.refresh')}</span>
            </button>

            {/* Unified Add Button with Keyboard Shortcut */}
            <button
              onClick={() => setIsAddWizardOpen(true)}
              className="group relative flex items-center gap-2 px-6 py-2.5 rounded-lg font-semibold transition-all duration-200 shadow-lg hover:shadow-xl hover:-translate-y-0.5 active:translate-y-0"
              style={{
                background: 'linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%)',
                color: 'white'
              }}
              title={`Quick Add (${navigator.platform.includes('Mac') ? 'Cmd' : 'Ctrl'}+K)`}
            >
              <Plus className="w-5 h-5" />
              <span className="hidden sm:inline">{t('common:actions.add')}</span>
              <Sparkles className="w-4 h-4 opacity-80" />
              {/* Keyboard shortcut badge - shown on hover */}
              <span className="hidden lg:flex absolute -bottom-8 left-1/2 -translate-x-1/2 items-center gap-1 px-2 py-1 rounded text-xs font-mono opacity-0 group-hover:opacity-100 transition-opacity duration-200 whitespace-nowrap pointer-events-none" style={{ backgroundColor: 'var(--bg-primary)', color: 'var(--text-secondary)', boxShadow: '0 2px 8px rgba(0,0,0,0.1)' }}>
                <kbd className="px-1.5 py-0.5 rounded text-xs font-semibold" style={{ backgroundColor: 'var(--bg-tertiary)', border: '1px solid var(--border-secondary)' }}>
                  {navigator.platform.includes('Mac') ? '⌘' : 'Ctrl'}
                </kbd>
                <span>+</span>
                <kbd className="px-1.5 py-0.5 rounded text-xs font-semibold" style={{ backgroundColor: 'var(--bg-tertiary)', border: '1px solid var(--border-secondary)' }}>
                  K
                </kbd>
              </span>
            </button>
          </div>
        </div>

        {/* Main Dashboard Layout */}
        <div className="space-y-6">
          {/* SECTION 1: Bakery Health Status */}
          <div data-tour="dashboard-stats">
            <HealthStatusCard healthStatus={healthStatus} loading={healthLoading} />
          </div>

          {/* SECTION 2: What Needs Your Attention (Action Queue) */}
          <div data-tour="pending-po-approvals">
            <ActionQueueCard
              actionQueue={actionQueue}
              loading={actionQueueLoading}
              onApprove={handleApprove}
              onReject={handleReject}
              onViewDetails={handleViewDetails}
              onModify={handleModify}
              tenantId={tenantId}
            />
          </div>

          {/* SECTION 3: What the System Did for You (Orchestration Summary) */}
          <div data-tour="real-time-alerts">
            <OrchestrationSummaryCard
              summary={orchestrationSummary}
              loading={orchestrationLoading}
            />
          </div>

          {/* SECTION 4: Today's Production Timeline */}
          <div data-tour="today-production">
            <ProductionTimelineCard
              timeline={productionTimeline}
              loading={timelineLoading}
              onStart={handleStartBatch}
              onPause={handlePauseBatch}
            />
          </div>

          {/* SECTION 5: Quick Insights Grid */}
          <div>
            <h2 className="text-2xl font-bold mb-4" style={{ color: 'var(--text-primary)' }}>{t('dashboard:sections.key_metrics')}</h2>
            <InsightsGrid insights={insights} loading={insightsLoading} />
          </div>

          {/* SECTION 6: Quick Action Links */}
          <div className="rounded-xl shadow-md p-6" style={{ backgroundColor: 'var(--bg-primary)' }}>
            <h2 className="text-xl font-bold mb-4" style={{ color: 'var(--text-primary)' }}>{t('dashboard:sections.quick_actions')}</h2>
            <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
              <button
                onClick={() => navigate('/app/operations/procurement')}
                className="flex items-center justify-between p-4 rounded-lg transition-colors duration-200 group"
                style={{ backgroundColor: 'var(--bg-tertiary)', borderLeft: '4px solid var(--color-info)' }}
              >
                <span className="font-semibold" style={{ color: 'var(--text-primary)' }}>{t('dashboard:quick_actions.view_orders')}</span>
                <ExternalLink className="w-5 h-5 group-hover:translate-x-1 transition-transform duration-200" style={{ color: 'var(--color-info)' }} />
              </button>

              <button
                onClick={() => navigate('/app/operations/production')}
                className="flex items-center justify-between p-4 rounded-lg transition-colors duration-200 group"
                style={{ backgroundColor: 'var(--bg-tertiary)', borderLeft: '4px solid var(--color-success)' }}
              >
                <span className="font-semibold" style={{ color: 'var(--text-primary)' }}>{t('dashboard:quick_actions.view_production')}</span>
                <ExternalLink className="w-5 h-5 group-hover:translate-x-1 transition-transform duration-200" style={{ color: 'var(--color-success)' }} />
              </button>

              <button
                onClick={() => navigate('/app/database/inventory')}
                className="flex items-center justify-between p-4 rounded-lg transition-colors duration-200 group"
                style={{ backgroundColor: 'var(--bg-tertiary)', borderLeft: '4px solid var(--color-secondary)' }}
              >
                <span className="font-semibold" style={{ color: 'var(--text-primary)' }}>{t('dashboard:quick_actions.view_inventory')}</span>
                <ExternalLink className="w-5 h-5 group-hover:translate-x-1 transition-transform duration-200" style={{ color: 'var(--color-secondary)' }} />
              </button>

              <button
                onClick={() => navigate('/app/database/suppliers')}
                className="flex items-center justify-between p-4 rounded-lg transition-colors duration-200 group"
                style={{ backgroundColor: 'var(--bg-tertiary)', borderLeft: '4px solid var(--color-warning)' }}
              >
                <span className="font-semibold" style={{ color: 'var(--text-primary)' }}>{t('dashboard:quick_actions.view_suppliers')}</span>
                <ExternalLink className="w-5 h-5 group-hover:translate-x-1 transition-transform duration-200" style={{ color: 'var(--color-warning)' }} />
              </button>
            </div>
          </div>
        </div>
      </div>

      {/* Mobile-friendly bottom padding */}
      <div className="h-20 md:hidden"></div>

      {/* Unified Add Wizard */}
      <UnifiedAddWizard
        isOpen={isAddWizardOpen}
        onClose={() => setIsAddWizardOpen(false)}
        onComplete={handleAddWizardComplete}
      />

      {/* Purchase Order Details Modal */}
      {selectedPOId && (
        <PurchaseOrderDetailsModal
          poId={selectedPOId}
          tenantId={tenantId}
          isOpen={isPOModalOpen}
          onClose={() => {
            setIsPOModalOpen(false);
            setSelectedPOId(null);
          }}
          onApprove={handleApprove}
          onModify={handleModify}
        />
      )}
    </div>
  );
}

export default NewDashboardPage;