/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    `FuzzyTaskBotRule` is a `GKRule` subclass that asserts a `fact` if and only if its `grade()` function returns a non-zero value. Subclasses for the specific rules used in the game can be found in Rules.swift.

*/

import GameplayKit

class FuzzyTaskBotRule: GKRule {

    // MARK: Properties

    var snapshot: EntitySnapshot!

    func grade() -> Float { return 0.0 }

    let fact: Fact

    // MARK: Initializers

    init(fact: Fact) {

        self.fact = fact

        super.init()

        // Set the salience so that 'fuzzy' rules will evaluate first.

        salience = Int.max

    }

    // MARK: GPRule Overrides

    override func evaluatePredicate(in system: GKRuleSystem) -> Bool {

        snapshot = system.state["snapshot"] as! EntitySnapshot

        if grade() >= 0.0 {

            return true

        }

        return false

    }

    override func performAction(in system: GKRuleSystem) {

        system.assertFact(fact.rawValue as NSObject, grade: grade())

    }

}