import * as CellSet from Geometry.CellSet;
import set from Grid.Util;
import * as Inclusion from Solver.Inclusion;
import * as SingleCell from Solver.SingleCell;
import * as State from Solver.State;
import * as Strategy from Solver.Strategy;

return {
	rate: rate,
	solve: solve,
	findNextStep: findNextStep
};

function solve(coloring) {
	var solvingState = State.start(coloring);
	var stuck = false;
	while(!stuck && solvingState.missing.size() > 0) {
		Strategy.execute(
			findNextStep(solvingState),
			applyStep(solvingState),
			function() {console.log('Solver is stuck'); stuck = true;}
		);
	}
	return solvingState.constellation;
}

function rate(coloring) {
}

function findNextStep(solvingState) {
	return Strategy.tryEach([
		Inclusion.find(solvingState),
		SingleCell.find(solvingState)
	]);
}

function applyStep(solvingState) {
	return function(step) {
		console.log(step);
		['empty', 'star'].forEach(function(attribute) {
			if(step[attribute] != undefined) {
				step[attribute].iter(function(cell) {
					set(solvingState.constellation, cell, attribute == 'star');
					forget(solvingState, cell);
				});
			}
		});
	};
}

function forget(solvingState, cell) {
	State.getCellSets(solvingState).concat(solvingState.missing)
		.forEach(function(cellSet) {cellSet.remove(cell);});
}