import { describe, it, expect, beforeEach } from 'vitest';
import { AllDayManager } from '../../src/managers/AllDayManager';
import { setupMockDOM, createMockEvent } from '../helpers/dom-helpers';

describe('AllDayManager - Layout Calculation', () => {
  let allDayManager: AllDayManager;

  beforeEach(() => {
    setupMockDOM();
    allDayManager = new AllDayManager();
  });

  describe('Overlap Detection Scenarios', () => {
    it('Scenario 1: Non-overlapping single-day events', () => {
      // Event 1: Sept 22 (column 1)
      const event1 = createMockEvent('1', 'Event 1', '2024-09-22', '2024-09-22');
      const layout1 = allDayManager.calculateAllDayEventLayout(event1);
      
      expect(layout1.startColumn).toBe(1);
      expect(layout1.row).toBe(1);
      
      // Event 2: Sept 24 (column 3) - different column, should be row 1
      const event2 = createMockEvent('2', 'Event 2', '2024-09-24', '2024-09-24');
      const layout2 = allDayManager.calculateAllDayEventLayout(event2);
      
      expect(layout2.startColumn).toBe(3);
      expect(layout2.row).toBe(1);
    });

    it('Scenario 2: Overlapping multi-day events - Autumn Equinox vs Teknisk Workshop', () => {
      // Autumn Equinox: Sept 22-23 (columns 1-2)
      const autumnEvent = createMockEvent('autumn', 'Autumn Equinox', '2024-09-22', '2024-09-23');
      const autumnLayout = allDayManager.calculateAllDayEventLayout(autumnEvent);
      
      expect(autumnLayout.startColumn).toBe(1);
      expect(autumnLayout.endColumn).toBe(2);
      expect(autumnLayout.row).toBe(1);
      
      // Teknisk Workshop: Sept 23-26 (columns 2-5) - overlaps on Sept 23
      const workshopEvent = createMockEvent('workshop', 'Teknisk Workshop', '2024-09-23', '2024-09-26');
      const workshopLayout = allDayManager.calculateAllDayEventLayout(workshopEvent);
      
      expect(workshopLayout.startColumn).toBe(2);
      expect(workshopLayout.endColumn).toBe(5);
      expect(workshopLayout.row).toBe(2); // Should be row 2 due to overlap
    });

    it('Scenario 3: Multiple events in same column', () => {
      // Event 1: Sept 23 only
      const event1 = createMockEvent('1', 'Event 1', '2024-09-23', '2024-09-23');
      const layout1 = allDayManager.calculateAllDayEventLayout(event1);
      
      expect(layout1.startColumn).toBe(2);
      expect(layout1.row).toBe(1);
      
      // Event 2: Sept 23 only - same column, should be row 2
      const event2 = createMockEvent('2', 'Event 2', '2024-09-23', '2024-09-23');
      const layout2 = allDayManager.calculateAllDayEventLayout(event2);
      
      expect(layout2.startColumn).toBe(2);
      expect(layout2.row).toBe(2);
      
      // Event 3: Sept 23 only - same column, should be row 3
      const event3 = createMockEvent('3', 'Event 3', '2024-09-23', '2024-09-23');
      const layout3 = allDayManager.calculateAllDayEventLayout(event3);
      
      expect(layout3.startColumn).toBe(2);
      expect(layout3.row).toBe(3);
    });

    it('Scenario 4: Partial overlaps', () => {
      // Event 1: Sept 22-23 (columns 1-2)
      const event1 = createMockEvent('1', 'Event 1', '2024-09-22', '2024-09-23');
      const layout1 = allDayManager.calculateAllDayEventLayout(event1);
      
      expect(layout1.startColumn).toBe(1);
      expect(layout1.endColumn).toBe(2);
      expect(layout1.row).toBe(1);
      
      // Event 2: Sept 23-24 (columns 2-3) - overlaps on Sept 23
      const event2 = createMockEvent('2', 'Event 2', '2024-09-23', '2024-09-24');
      const layout2 = allDayManager.calculateAllDayEventLayout(event2);
      
      expect(layout2.startColumn).toBe(2);
      expect(layout2.endColumn).toBe(3);
      expect(layout2.row).toBe(2); // Should be row 2 due to overlap
      
      // Event 3: Sept 25-26 (columns 4-5) - no overlap, should be row 1
      const event3 = createMockEvent('3', 'Event 3', '2024-09-25', '2024-09-26');
      const layout3 = allDayManager.calculateAllDayEventLayout(event3);
      
      expect(layout3.startColumn).toBe(4);
      expect(layout3.endColumn).toBe(5);
      expect(layout3.row).toBe(1); // No overlap, back to row 1
    });

    it('Scenario 5: Complex overlapping pattern', () => {
      // Event 1: Sept 22-25 (columns 1-4) - spans most of week
      const event1 = createMockEvent('1', 'Long Event', '2024-09-22', '2024-09-25');
      const layout1 = allDayManager.calculateAllDayEventLayout(event1);
      
      expect(layout1.startColumn).toBe(1);
      expect(layout1.endColumn).toBe(4);
      expect(layout1.row).toBe(1);
      
      // Event 2: Sept 23-24 (columns 2-3) - overlaps with Event 1
      const event2 = createMockEvent('2', 'Short Event', '2024-09-23', '2024-09-24');
      const layout2 = allDayManager.calculateAllDayEventLayout(event2);
      
      expect(layout2.startColumn).toBe(2);
      expect(layout2.endColumn).toBe(3);
      expect(layout2.row).toBe(2);
      
      // Event 3: Sept 24-26 (columns 3-5) - overlaps with both
      const event3 = createMockEvent('3', 'Another Event', '2024-09-24', '2024-09-26');
      const layout3 = allDayManager.calculateAllDayEventLayout(event3);
      
      expect(layout3.startColumn).toBe(3);
      expect(layout3.endColumn).toBe(5);
      expect(layout3.row).toBe(3); // Should be row 3 due to overlaps with both
    });

    it('Scenario 6: Drag-drop target date override', () => {
      // Multi-day event dragged to specific date should use single column
      const event = createMockEvent('drag', 'Dragged Event', '2024-09-22', '2024-09-25');
      const layout = allDayManager.calculateAllDayEventLayout(event, '2024-09-24');
      
      expect(layout.startColumn).toBe(3); // Sept 24 is column 3
      expect(layout.endColumn).toBe(3);   // Single column when targetDate specified
      expect(layout.columnSpan).toBe(1);
      expect(layout.row).toBe(1);
    });
  });
});