As we collaborate on coding projects, please adhere to the following guidelines to ensure clarity and maintain the integrity of the codebase:

No Refactoring Without Consent: Do not refactor any existing code unless explicitly approved by me.
Preserve Functionality: Ensure that all current functions and features remain intact. Any proposed changes that may alter functioning code must be clearly communicated and justified.
No Minor Changes for Aesthetic Purposes: Avoid making changes for the sake of appearance or layout that do not contribute to resolving issues or enhancing functionality. For example, changes in spacing or indentation that do not impact the execution of the code are not warranted.
Request for Changes: Any modifications, especially significant ones, should be communicated as formal requests before implementation, including the reasoning behind the change.
Testing and Documentation: All modifications should be accompanied by proper documentation in the code and should maintain or enhance test coverage to ensure no existing features break.
Version Control: All changes must be committed incrementally with descriptive messages using version control systems like Git. Provide context for each change to maintain clarity over the code’s evolution.

By adhering to these guidelines, we can work together effectively and ensure the quality and reliability of our codebase.


import React, { useState } from 'react';
import { WidthProvider, Responsive } from 'react-grid-layout';
import 'react-grid-layout/css/styles.css';
import 'react-resizable/css/styles.css';
import '../../styles/GridLayout.css';

import BlocksMap from '../../constants/BlocksMap';
import BlockBlank from './blocks/BlockBlank';
import BlockContact from './blocks/BlockContact';
import BlockHeader from './blocks/BlockHeader';
import BlockLogo from './blocks/BlockLogo';
import BlockPhoto from './blocks/BlockPhoto';
import BlockText from './blocks/BlockText';

const ResponsiveGridLayout = WidthProvider(Responsive);

const App = () => {

	const [isModalOpen, setModalOpen] = useState(false);
	const [blocks, setBlocks] = useState([]);// Current blocks on the grid
	const [editingBlock, setEditingBlock] = useState(null);// Currently edited block
	const [blockContent, setBlockContent] = useState([]);
	const [newBlockCount, setNewBlockCount] = useState(0);// Counter for new blocks added
	const [layout, setLayout] = useState([]);// Layout of blocks
	
	const ROW_HEIGHT = 120;
	const GRID_COLS = 6;
	const GRID_ROWS = 10;
	
	const calculateMaxBlocks = (blockList, newBlockWidth, newBlockHeight) => {
	
		const occupiedGrid = Array.from({ length: GRID_ROWS }, () => Array(GRID_COLS).fill(false));
		blockList.forEach(block => {
			
			for (let dy = 0; dy < block.h; dy++) {
				for (let dx = 0; dx < block.w; dx++) {
					
					const gridY = block.y + dy;
					const gridX = block.x + dx;
					
					// Ensure we don't go out of bounds of the grid
					if (gridY < GRID_ROWS && gridX < GRID_COLS) {
						
						occupiedGrid[gridY][gridX] = true;
					}
				}
			}
		});
		let maxPossible = 0;
		
		for (let y = 0; y <= GRID_ROWS - newBlockHeight; y++) {
			for (let x = 0; x <= GRID_COLS - newBlockWidth; x++) {
				
				let canPlace = true;
				
				for (let dy = 0; dy < newBlockHeight; dy++) {
					for (let dx = 0; dx < newBlockWidth; dx++) {
						
						if (occupiedGrid[y + dy][x + dx]) {
							
							canPlace = false;
							break;
						}
					}
					if (!canPlace) {
						
						break;
					}
				}
				if (canPlace) {
					
					maxPossible++;
				}
			}
		}
		
		return maxPossible;
	};
	
	const handleAddBlock = (width, height, content, id) => {
	
		const MAX_BLOCKS = calculateMaxBlocks(blocks, width, height);
		if (blocks.length >= MAX_BLOCKS) {
			
			alert("Maximum number of blocks reached!");
			return;
		}
		
		const newId = `block-${id}-${newBlockCount}`;
		let availablePosition = null;
		if (blocks.length < MAX_BLOCKS) {
		
			for (let y = 0; y <= GRID_ROWS - height; y++) {
				for (let x = 0; x <= GRID_COLS - width; x++) {
				
					if (x + width <= GRID_COLS && y + height <= GRID_ROWS) {
					
						let canPlace = true;
						for (let dy = 0; dy < height; dy++) {
							for (let dx = 0; dx < width; dx++) {
							
								const checkX = x + dx;
								const checkY = y + dy;
								if (checkX < GRID_COLS && checkY < GRID_ROWS) {
									
									if (blocks.some(block => 
										(block.x === checkX && block.y === checkY) ||// Exact overlap check
										(block.x < (checkX + width) && block.x + block.w > x &&// Block overlaps horizontally
										block.y < (checkY + height) && block.y + block.h > y)))// Block overlaps vertically
									{
										canPlace = false;
										break;
									}
								}
								
							}
							if (!canPlace) {
							
								break;
							}
						}
						if (canPlace) {
						
							availablePosition = { x, y, w: width, h: height };
							break;
						}
					}
				}
        			if (availablePosition) {
        			
        				break;
        			}
        		}
        	}
        	if (availablePosition) {
        	
        		setBlocks(prevBlocks => [
        			...prevBlocks,
        			{ i: newId, x: availablePosition.x, y: availablePosition.y, w: width, h: height, content }
        		]);
        		
        		setNewBlockCount(prevCount => prevCount + 1);
        		
        		setLayout(prevLayout => [...prevLayout, { i: newId, ...availablePosition }]);
        	}
        	else {
        		alert("No available space to add a new block!");
        	}
        };
        
        const handleCloseModal = () => {
		
		setModalOpen(false);
		setEditingBlock(null);
		setBlockContent('');
	};
	
	const handleRemoveBlock = (id) => {
		
		// Update blocks and layout state to remove the block specified by ID
		setBlocks(prevBlocks => prevBlocks.filter(block => block.i !== id));
		setLayout(prevLayout => prevLayout.filter(item => item.i !== id));
	};
	
	const handleEditBlock = (block) => {
		
		setEditingBlock(block);// Set the block that is currently being edited
		setBlockContent(block.content);// Pre-populate with current block content
		setModalOpen(true);
	};
	
	const handleSaveBlockContent = (newContent) => {
	
		if (!editingBlock) {
		
			return;
		}
		
		setBlocks(prevBlocks => 
			prevBlocks.map(block => (block.i === editingBlock.i ? { ...block, content: newContent } : block))
		);
		
		setEditingBlock(null);
		
		handleCloseModal();
	};
	
	const handleLayoutChange = (newLayout) => {
	
		const updatedLayout = newLayout.map(item => {
			
			return {
				...item,
				y: Math.min(item.y, GRID_ROWS - 1),// Ensure y position does not exceed GRID_ROWS
			};
		});
		
		setLayout(updatedLayout);
		
		const validLayout = updatedLayout.filter((item, index) => {
			
			const block = blocks.find(b => b.i === item.i);
			return block && item.x + block.w <= GRID_COLS && item.y + block.h <= GRID_ROWS;
		});
		
		setBlocks(layout => layout.map(block => {
			
			// Find corresponding block
			const layoutItem = updatedLayout.find(item => item.i === block.i);
			return layoutItem ? { ...block, x: layoutItem.x, y: layoutItem.y, w: layoutItem.w, h: layoutItem.h } : block;
		}));
	};
	
	return (
		
		<div className="container-md">
		
			{/* Create buttons for adding each block size defined in BlocksMap */}
			{BlocksMap.map((size, index) => (
				<button
					key={index}
					className="btn btn-primary mb-3 me-2"
					// Handler to add block
					onClick={() => handleAddBlock(size.width, size.height, size.content, size.id)}
				>
					Add {size.content} Block
				</button>
			))}
			
			{/* Responsive grid layout component for displaying and managing blocks */}
			<ResponsiveGridLayout
				className="layout"
				layouts={layout}
				style={{ minHeight: `${ROW_HEIGHT * 5}px`, position: 'relative' }}// Minimum height for 5 rows
				breakpoints={{ lg: 1200 }}// Breakpoint to determine layout changes
				cols={{ lg: GRID_COLS }}// Number of columns for the grid
				rowHeight={ROW_HEIGHT}// Height of each grid row
				onLayoutChange={ handleLayoutChange }// Function to call on layout change
				isBounded={ false }// Prevent blocks from being dragged outside the grid
				preventCollision={ true }// Prevent collisions when dragging
				isResizable={ false }// Disable resizing of blocks
				draggableHandle=".block-option-drag"// Handle class for dragging
				verticalCompact={ true }
			>
				{/* Render blocks in the grid */}
				{blocks.map((block) => (
					<div key={block.i} className="block" data-grid={block}>
					
						<div className="block-header d-flex">
							<div className="block-option-drag flex-grow-1" style={{ cursor: 'move' }}>
								<i className="bi bi-arrows-move"></i>
							</div>
							<div className="block-option-edit">
								<button
									className="btn btn-sm"
									onClick={() => handleEditBlock(block)}
									aria-label="Edit Block"
								>
									<i className="bi bi-pencil"></i>
								</button>
							</div>
							<div className="block-option-remove">
								<button
									className="btn btn-sm"
									onClick={() => handleRemoveBlock(block.i)}
									aria-label="Remove Block"
								>
									<i className="bi bi-trash"></i>
								</button>
							</div>
						</div>
						
						<div className="block-content d-flex align-items-center justify-content-center">
							{block.content}
						</div>
					</div>
				))}
				{/* Render blocks in the grid */}
				
			</ResponsiveGridLayout>
			
			{/* Bootstrap Modal for Editing Block Content */}
			<div className={`modal fade ${isModalOpen ? "show" : ""}`} style={{ display: isModalOpen ? "block" : "none" }} tabIndex="-1" role="dialog">
				<div className="modal-dialog" role="document">
					<div className="modal-content">
						<div className="modal-header">
							<h5 className="modal-title">Edit Block</h5>
							
							<button type="button" className="btn btn-close" onClick={ handleCloseModal }></button>
						</div>
						<div className="modal-body">
							<textarea 
								value={ blockContent } 
								onChange={ (e) => setBlockContent(e.target.value) } 
								className="form-control"
								 rows="4"
							/>
						</div>
						<div className="modal-footer">
							<button type="button" className="btn btn-secondary" onClick={handleCloseModal}>Close</button>
							<button type="button" className="btn btn-primary" onClick={handleSaveBlockContent}>Save changes</button>
						</div>
					</div>
				</div>
			</div>
			{isModalOpen && <div className="modal-backdrop fade show"></div>}
			{/* Bootstrap Modal for Editing Block Content */}
			
			<div className="layout-editor-intro">
				<h4>How it works:</h4>
				<ul>
					<li><i className="bi bi-arrows-move me-2"></i><strong>Drag and Drop Functionality:</strong> Easily reposition content blocks within the canvas without overlap for clear visibility.</li>
					<li><i className="bi bi-pencil"></i> <strong>Add and Edit Content:</strong> Click on the blocks’ edit icon to modify their content easily.</li>
					<li><i className="bi bi-trash"></i> <strong>Remove Blocks:</strong> To remove a block from the grid, click on the trash icon.</li>
				</ul>
				
				<h4>Key Features:</h4>
				<ul>
					<li><i className="bi bi-arrow-up-circle me-2"></i><strong>Automatic Adjustment:</strong> When removing a block, lower blocks will automatically shift up, maintaining a tidy layout.</li>
					<li><i className="bi bi-eye me-2"></i><strong>Visual Indicators:</strong> Highlighted areas show where you can safely place blocks, facilitating efficient arrangement.</li>
					<li><i className="bi bi-lightbulb me-2"></i><strong>Flexible Exploration:</strong> Experiment with different layouts to find the best configuration for your content, ensuring optimal user experience.</li>
					
				</ul>
			</div>
		</div>
	);
};

export default App;


The BlocksMap file:

//src/constants/BlocksMap.js
const BlocksMap = [
	{ id: 'header', width: 6, height: 2, content: 'Header', type: 'header' },
	{ id: 'space', width: 1, height: 1, content: 'Blank Space', type: 'blank' },
	{ id: 'photo', width: 2, height: 2, content: 'Photo', type: 'photo' },
	{ id: 'contact', width: 2, height: 3, content: 'Contact Us', type: 'contact' },
	{ id: 'logo', width: 1, height: 1, content: 'Logo', type: 'logo' },
];

export default BlocksMap;


Goal:
- The key to effective refactoring is preserving the original functionality while enhancing the code structure for better maintainability, 
  readability, and extensibility. Main part is "preserving the original functionality".
- App.js becomes Editor.js and configuration for the react-grid-layout code and importing blocks and handling of blocks.
- Rendering a block. Each block has a "type" that needs to be for calling a unique modal with defined features for that type of block. Code
  example:
  
	const renderBlock = (block) => {
		
		switch (block.type) {
			
			case 'photo' :
				return <BlockPhoto block={block} onEdit={openModal} />;
				
			case 'text' :
				return <BlockText block={block} onEdit={openModal} />;
			
			default :
				return null;
		}
	};

//src/components/main/blocks/BlockPhoto.js
import React from 'react';
import ModalPhoto from '../modals/ModalPhoto';

const BlockPhoto = ({ block, onEdit }) => (
	
	<div>
		<h3>{block.title}</h3>
		<img src={block.content || "placeholder.png"} alt={block.title} height="100" />
		<button onClick={() => onEdit(block)}>Edit</button>
	</div>
);


- Modals are use for editing Blocks information. Since each block is unique the Modal that matches the block "type" are also
  unique with forms and how they handle data.


{isModalOpen && currentModalType === 'photo' && (

	<ModalPhoto
		isOpen={isModalOpen}
		onRequestClose={closeModal}
		blockData={currentBlock}
		onSave={saveBlockData}
	/>
)}
{isModalOpen && currentModalType === 'text' && (

	<ModalText
		isOpen={isModalOpen}
		onRequestClose={closeModal}
		blockData={currentBlock}
		onSave={saveBlockData}
	/>
)}


//src/components/main/modals/ModalPhoto.js
const ModalPhoto = ({ isOpen, onRequestClose, blockData, onSave }) => {
	
	const [formData, setFormData] = useState(blockData);
	const [file, setFile] = useState(null);
	
	const handleChange = (e) => {
		
		const { name, value } = e.target;
		setFormData({ ...formData, [name]: value });
	};
	
	const handleFileChange = (e) => {
		
		setFile(e.target.files[0]);
	};
	
	const handleSubmit = async (e) => {
		
		e.preventDefault();
		
		if (file) {
			
			const reader = new FileReader();
			reader.onloadend = () => {
				
				onSave({ ...formData, content: reader.result });
			};
			
			reader.readAsDataURL(file);
		}
		else {
			onSave(formData);
		}
		
		onRequestClose();
	};
	
	return (
		
		<Modal isOpen={isOpen} onRequestClose={onRequestClose}>
			
			<h2>Edit Photo Block</h2>
			<form onSubmit={handleSubmit}>
				<div>
					<label>
						Title:
						<input
							type="text"
							name="title"
							value={formData.title}
							onChange={handleChange}
						/>
					</label>
				</div>
				
				<label>
					Upload Photo:
					<input type="file" onChange={handleFileChange} />
				</label>
				
				<label>
					or Photo URL:
					<input
						type="text"
						name="content"
						value={formData.content}
						onChange={handleChange}
					/>
				</label>
				
				<button type="submit">Save</button>
				<button type="button" onClick={onRequestClose}>Cancel</button>
			</form>
		</Modal>
	);
};

export default ModalPhoto;