class MazeSolver {
	constructor(startingCell, targetCell, searchedColor = [210, 180, 140]){
		this.frontier = [];
		this.explored = [];
		this.targetCell = targetCell;
		this.searchedColor = searchedColor;
		this.selectedColor = [50, 175, 50];
		this.currentCell = startingCell;
		this.frontier.push(startingCell);
	}
	
	clearState(){
		this.frontier = [];
		this.explored = [];
	}
	
	depthFirstNextCell(maze){
		breadthFirstNextCell(maze, true);
	}
	
	breadthFirstNextCell(maze, depthFirst = false){
		this.currentCell.color = this.searchedColor;
		
		if(!depthFirst)
			this.currentCell = this.frontier.shift();
		else
			this.currentCell = this.frontier.pop();
			
		this.currentCell.color = this.selectedColor;
		
		this.currentCell.visited = true;
		
		let moves = maze.getLegalMoves(this.currentCell);
		
		for (let i = 0; i < moves.length; i++){
			this.frontier.push(moves[i]);
			moves[i].parent = this.currentCell;
		}
		
		this.explored.push(this.currentCell);
		
		if(this.currentCell.x == this.targetCell.x && this.currentCell.y == this.targetCell.y)
			this.frontier = [];
			this.currentCell.color = this.searchedColor;
	}
	
	highlightFinalPath(maze, finalPathColor = [173, 216, 230]){
		let tmp = this.explored.pop();
		
		while(tmp != undefined){
			tmp.color = finalPathColor;
			tmp = tmp.parent;
		}
		
	    maze.updateMazeDisplay();
	}
}