const ANTUP    = 0
const ANTRIGHT = 1
const ANTDOWN  = 2
const ANTLEFT  = 3

class Ant {
	x = 0
	y = 0

	direction = ANTRIGHT

	moveForward(width, height) {

		switch(this.direction) {

			case ANTUP : {
				this.y = (this.y - 1 +height)%height
				break
			}

			case ANTLEFT : {
				this.x = (this.x - 1 +width)%width
				break
			}

			case ANTRIGHT : {
				this.x = (this.x + 1 +width)%width
				break
			}

			case ANTDOWN : {
				this.y = (this.y + 1 +height)%height
				break
			}

		}
	}

	rotateRight() {

		switch(this.direction) {

			case ANTUP : {
				this.direction = ANTRIGHT
				break
			}

			case ANTLEFT : {
				this.direction = ANTUP
				break
			}

			case ANTRIGHT : {
				this.direction = ANTDOWN
				break
			}

			case ANTDOWN : {
				this.direction = ANTLEFT
				break
			}

		}
		
	}

	rotateLeft() {
		switch(this.direction) {

			case ANTUP : {
				this.direction = ANTLEFT
				break
			}

			case ANTLEFT : {
				this.direction = ANTDOWN
				break
			}

			case ANTRIGHT : {
				this.direction = ANTUP
				break
			}

			case ANTDOWN : {
				this.direction = ANTRIGHT
				break
			}

		}
	}
}

class GridManager {
	ACTIVE_COLOR = 'black';
	INACTIVE_COLOR = 'white';

	gridContainerId;
	gridSize;
	grid = [];
	ant;   // la fourmi

	constructor(gridSize, gridContainerId,ant) {
		if (!gridSize || gridSize < 30) {
			throw new Error('The grid size must be at least 30');
		}

		if (!gridContainerId) {
			throw new Error('gridContainerId must be set');
		}

		this.gridSize = gridSize;
		this.gridContainerId = gridContainerId;
		this.ant = ant
		this.ant.x = this.ant.y = gridSize/2
		this.createGrid();
	}

	createGrid() {
		const container = document.getElementById(this.gridContainerId);

		for (let i = 0; i < this.gridSize; i++) {
			const row = document.createElement('div');
			row.className = 'row';

			const gridRow = [];

			for (let j = 0; j < this.gridSize; j++) {
				const cell = document.createElement('div');
				cell.className = 'cell';
				cell.style.backgroundColor = this.INACTIVE_COLOR;
				row.appendChild(cell);

				gridRow.push(cell);
			}

			container.appendChild(row);
			this.grid.push(gridRow);
		}
	}

	destroyGrid() {
		for (let x = 0; x < this.gridSize; x++) {
			for (let y = 0; y < this.gridSize; y++) {
				const node = this.grid[y][x];
				node.parentNode.removeChild(node);
			}
		}

		const container = document.getElementById(this.gridContainerId);
		while (container.firstChild) {
			container.removeChild(container.lastChild);
		}

		this.grid = [];
	}

	setInitialState(initialState) {
		const coords = initialState.split(';').map(coord => coord.split(','));
		coords.forEach((coord) => this.activeCell(+coord[0], +coord[1]));
	}

	isInGridRange(x, y) {
		return x >= 0 && x < this.gridSize && y >= 0 && y < this.gridSize;
	}

	isActiveCell(x, y) {
		return this.isInGridRange(x, y) && this.grid[y][x].style.backgroundColor === this.ACTIVE_COLOR;
	}

	activeCell(x, y) {
		if (!this.isInGridRange(x, y)) {
			return;
		}

		this.grid[y][x].style.backgroundColor = this.ACTIVE_COLOR;
	}

	deactiveCell(x, y) {
		if (!this.isInGridRange(x, y)) {
			return;
		}

		this.grid[y][x].style.backgroundColor = this.INACTIVE_COLOR;
	}

		logCurrentGridState() {
		const activeCells = [];

		for (let x = 0; x < this.gridSize; x++) {
			for (let y = 0; y < this.gridSize; y++) {
				if (this.isActiveCell(x, y)) {
					activeCells.push(`${x},${y}`);
				}
			}
		}

		console.log(activeCells.join(';'));
	}
}
// -----------------------------------------------------------------------------------------------------------------


const INITIAL_STATE = ''
const STEP_INTERVAL = 5
const DIV_CONTAINER_ID = 'container'
const BTN_AUTOPLAY_ID = 'autoplay'
const BTN_NEXT_MOVE_ID = 'next-move'
const MOVE_VAL_ID = 'move-value'
const GRID_SIZE_VAL_ID = 'grid-size-value'
const BTN_PLUS_100_ID = 'plus-100'
const BTN_RESTART = "restart"
const BTN_NEW_TAILLE = "new_taille"

function computeNextPosition(gridManager)
{
	// TODO



	let ant = gridManager.ant // fourmi

	ant.moveForward(gridManager.gridSize, gridManager.gridSize) // avance la fourmi

	if(gridManager.isActiveCell(ant.x, ant.y)) { // si la case est noire
		
		gridManager.deactiveCell(ant.x, ant.y) // met la case blanche

		ant.rotateLeft() // tourne à gauche
	}
	else{
		
		gridManager.activeCell(ant.x, ant.y) // met la case noir

		ant.rotateRight() // tourne à droite
	}

	document.getElementById(MOVE_VAL_ID).innerText++


}


// Fonction principale de la simulation
function main() {
	let autoplayInterval
	let gridSize = 60
	let generation = 0
	let nbMove = 0
	let ant = new Ant()
	let gridManager = new GridManager(gridSize, DIV_CONTAINER_ID,ant)
	gridManager.setInitialState(INITIAL_STATE);

	document.getElementById(MOVE_VAL_ID).innerText = 0

	// Lorsqu'un utilisateur clique sur 'Auto Play'
	document.getElementById(BTN_AUTOPLAY_ID).addEventListener('click', () => {
		if (autoplayInterval) {
			clearInterval(autoplayInterval)
			autoplayInterval = false
			return
		}
		autoplayInterval = setInterval(() => {
			computeNextPosition(gridManager);
		}, STEP_INTERVAL);
	})

	// Lorsqu'un utilisateur clique sur 'Next'
	document.getElementById(BTN_NEXT_MOVE_ID).addEventListener('click', () => {
		if (autoplayInterval) {
			clearInterval(autoplayInterval)
			autoplayInterval = false
		}
		computeNextPosition(gridManager)
	})

	// Lorsqu'un utilisateur clique sur 'Next'
	document.getElementById(BTN_PLUS_100_ID).addEventListener('click', () => {
		if (autoplayInterval) {
			clearInterval(autoplayInterval)
			autoplayInterval = false
		}
		for(let i=0; i<100; i++) {
			computeNextPosition(gridManager)
		}
		
	})

	// Lorsqu'un utilisateur clique sur 'Next'
	document.getElementById(BTN_RESTART).addEventListener('click', () => {
		if (autoplayInterval) {
			clearInterval(autoplayInterval)
			autoplayInterval = false
		}
		gridManager.destroyGrid()
		gridManager.createGrid()
		gridManager.setInitialState(INITIAL_STATE)
		document.getElementById(MOVE_VAL_ID).innerText = 0
	})

	// Lorsqu'un utilisateur clique sur 'Next'
	document.getElementById(BTN_NEW_TAILLE).addEventListener('click', () => {
		if (autoplayInterval) {
			clearInterval(autoplayInterval)
			autoplayInterval = false
		}

		let taille = prompt("Veuillez renseigner une nouvelle taille", gridManager.gridSize)
		gridManager.destroyGrid()
		gridManager.gridSize = taille
		gridManager.createGrid()
		gridManager.setInitialState(INITIAL_STATE)
		document.getElementById(MOVE_VAL_ID).innerText = 0
	})
}


// La simulation  est démarrée ici
main()