implemented win condition check

src/routes/(app)/+page.svelte

@@ -130,6 +130,49 @@
 		reveal(cell);
 	}
 
+	function NodeListToArray(list: NodeListOf<Element>): Element[] {
+		return Array.prototype.slice.call(list);
+	}
+
+	async function checkWinCondition() {
+		// Get all HTML Table Cell Elements
+		const cells = document.querySelectorAll('td') as NodeListOf<HTMLTableCellElement>;
+		const array = NodeListToArray(cells) as HTMLTableCellElement[];
+		
+		// Convert all HTML Table Cell Elements to Cells
+		const mines = array.filter(e => e.dataset.marked).map(e => {
+			// Get id from cell
+			if (e.dataset.id === undefined) return null;
+			const index: number = parseInt(e.dataset.id);
+			// Calculate coordinates from index
+			const { x, y } = toCoords(index);
+			return { x, y } as Cell;
+		}).filter(e => e !== null) as Cell[];
+
+		// Prepare URL serach param for cell array
+		const params: URLSearchParams = new URLSearchParams();
+		params.set('mines', JSON.stringify(mines));
+		
+		// Send get-request to verify marked as mines
+		const response: Response = await fetch('/checkMarked?' + params.toString());
+		// Parse response to JSON
+		const data: RawResponse = await response.json();
+		
+		// Get status for error handling and cells in case it works
+		const { success, message, done } = data;
+		if (done === undefined || !success)
+			throw new Error(`Couldn't verify marked cells!\n${message}`);
+
+		console.log(message);
+		// If all marked cells have been verified as mines
+		if (done) {
+			// Display an event message, reset matrix on click
+			const elements = getElements();
+			const onClickFunc = () => { updateMatrix(false); };
+			displayMessage(elements, 'You won!', 'white', 'black', onClickFunc);
+		}
+	}
+
 	async function reveal(cell: HTMLTableCellElement) {
 		if (cell.dataset.clicked) return;
 		// Get id from cell
@@ -176,6 +219,9 @@
 			// Display the reveal
 			displayChange(element, 'lightgrey', neighbors);
 		}
+
+		// Check whether winning condition is met
+		checkWinCondition();
 	}
 
 	// Handle reveal logic on right click MouseEvent
@@ -205,6 +251,9 @@
 
 		// Remember cell for auto-reset
 		changed.push(cell);
+
+		// Check whether winning condition is met
+		checkWinCondition();
 	}
 
 	// Handle reveal logic on double click MouseEvent