const client = global.discord_client
const pool = global.db_pool;
const crypto = require('crypto');
const fs = require('fs');


const { pipeline } = require('stream');
const { promisify } = require('util');

const streamPipeline = promisify(pipeline);

/**
 * Downloads a file from a URL to a specified destination.
 * @param {string} url - The URL to download the file from.
 * @param {string} dest - The destination file path to save the file.
 * @param {function} cb - Callback function called on completion or error.
 */
async function download(url, dest, cb) {
	try {
		const response = await fetch(url);
		if (!response.ok) {
			throw new Error(`Failed to fetch ${url}: ${response.statusText}`);
		}
		await streamPipeline(response.body, fs.createWriteStream(dest));
		cb(null); // Signal success
	} catch (error) {
		cb(error); // Pass error to callback
	}
}

const cancel = (user) => {
	delete global.productUpdateData[user.id];
	delete global.dmHandlers[user.id];
	user.send('Product update cancelled.');
}

const execute = async (message) => {
	switch (global.productUpdateData[message.author.id].type) {
		case "name": // Name
			const newName = message.content.trim();
			if (newName.toLowerCase() === 'cancel') {
				cancel(message.author);
				return;
			}
			await pool.query('UPDATE products SET name = ? WHERE id = ?', [newName, global.productUpdateData[message.author.id].id]);
			message.channel.send('Product name updated!');
			break;
		case "description": // Description
			const newDesc = message.content.trim();
			if (newDesc.toLowerCase() === 'cancel') {
				cancel(message.author);
				return;
			}
			await pool.query('UPDATE products SET description = ? WHERE id = ?', [newDesc, global.productUpdateData[message.author.id].id]);
			message.channel.send('Product description updated!');
			break;
		case "devProductId": // Dev Product ID
			const newDevId = message.content.trim();
			if (newDevId.toLowerCase() === 'cancel') {
				cancel(message.author);
				return;
			}
			if (!/^\d{1,15}$/.test(newDevId)) {
				message.channel.send('Invalid Dev Product ID. It must be a number between 1 and 15 digits.');
				return;
			}
			await pool.query('UPDATE products SET devProductID = ? WHERE id = ?', [newDevId, global.productUpdateData[message.author.id].id]);
			message.channel.send('Dev Product ID updated!');
			break;
		case "imageId": // Image ID
			const newImageId = message.content.trim();
			if (newImageId.toLowerCase() === 'cancel') {
				cancel(message.author);
				return;
			}
			if (!/^\d{1,15}$/.test(newImageId)) {
				message.channel.send('Invalid Image ID. It must be a number between 1 and 15 digits.');
				return;
			}
			await pool.query('UPDATE products SET imageId = ? WHERE id = ?', [newImageId, global.productUpdateData[message.author.id].id]);
			message.channel.send('Image ID updated!');
			break;
		case "file": // File
			if (message.content.trim().toLowerCase() === 'cancel') {
				cancel(message.author);
				return;
			}

			if (message.attachments.size > 0) {
				const attachment = message.attachments.first();
				const validExtensions = ['zip', 'rbxm', 'rbxmx'];
				const fileExtension = attachment.name.split('.').pop().toLowerCase();

				if (!validExtensions.includes(fileExtension)) {
					message.channel.send('Invalid file type. Only zip, rbxm, and rbxmx files are allowed.');
					cancel(message.author);
					return;
				}
				const file = fs.createWriteStream(`./productFiles/${crypto.randomBytes(8).toString('hex')}`);
				download(attachment.url, file.path, async (err) => {
					if (err) {
						message.channel.send('Failed to download the file.');
						cancel(message.author);
						return;
					}
					const fileType = attachment.name.split('.').pop();
					await pool.query('UPDATE products SET file = ?, fileType = ? WHERE id = ?', [file.path.split('/').pop(), fileType, global.productUpdateData[message.author.id].id]);
					message.channel.send('File updated successfully!');
				});
			} else {
				message.channel.send('No file attached. Please upload the product file.');
			}
			break;
		case "stock": // Stocking info
			const newStock = parseInt(message.content.trim());
			if (isNaN(newStock)) {
				message.channel.send('Invalid stock quantity. It must be a number.');
				return;
			}
			await pool.query('UPDATE products SET stock = ? WHERE id = ?', [newStock, global.productUpdateData[message.author.id].id]);
			message.channel.send('Stock quantity updated!');
			break;
		case "category": // Category
			const newCategory = message.content.trim();
			if (newCategory.toLowerCase() === 'cancel') {
				cancel(message.author);
				return;
			}
			if (newCategory.toLowerCase() === '~none') {
				newCategory = null;
			}
			await pool.query('UPDATE products SET category = ? WHERE id = ?', [newCategory, global.productUpdateData[message.author.id].id]);
			message.channel.send('Category updated!');
			break;
		case "delete": // Delete
			const product = global.productUpdateData[message.author.id].id;
			console.log(product);
			if (message.content.toLowerCase() === 'cancel') {
				cancel(message.author);
				return;
			}
			if (message.content.toLowerCase() !== 'confirm') {
				message.channel.send('You must type `confirm` to delete the product, or `cancel` to exit.');
				return;
			}
			// Proceed with deletion
			message.channel.send('Deletion Confirmed. Starting deletion process...').then(async msg => {
				let curMsg = msg.content;
				// Delete fileAuth
				curMsg = curMsg + '\nDeleting file authorizations...'
				await msg.edit(curMsg);
				await pool.query('DELETE FROM fileAuth WHERE product = ?', [product]);
				// Delete file
				curMsg = curMsg + '\nDeleting product file...'
				await msg.edit(curMsg);
				const [product] = await pool.query('SELECT file FROM products WHERE id = ?', [global.productUpdateData[message.author.id].id]);
				if (product) {
					const safeFileId = path.basename(product.file);
					const filePath = path.join(__dirname, '../productFiles', safeFileId); // Code we use in the CDN route
					if (fs.existsSync(filePath)) {
						fs.unlinkSync(filePath);
						curMsg = curMsg + `\nDeleted file: ${safeFileId}`;
						await msg.edit(curMsg);
					} else {
						curMsg = curMsg + `\nFile not found (skipping): ${safeFileId}`;
						await msg.edit(curMsg);
					}
				}
				// Delete purchases
				curMsg = curMsg + '\nDeleting purchases...';
				await msg.edit(curMsg);
				await pool.query('DELETE FROM purchases WHERE productId = ?', [global.productUpdateData[message.author.id].id]);
				// Delete product
				curMsg = curMsg + '\nDeleting product...';
				await msg.edit(curMsg);
				await pool.query('DELETE FROM products WHERE id = ?', [global.productUpdateData[message.author.id].id]);
				curMsg = curMsg + '\nProduct deletion complete.';
				await msg.edit(curMsg);
			});
			break;
		default:
			message.channel.send('Invalid type. Somehow?');
			cancel(message.author);
			break;
	}
	delete global.productUpdateData[message.author.id];
	delete global.dmHandlers[message.author.id];
}
	module.exports = execute