// The MIT License (MIT)
//
// Copyright (c) 2016 Luke Zhao <me@lkzhao.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import Foundation

open class SolvableAnimation<Value: VectorConvertible>: ValueAnimation<Value>, SolverAnimatable {
    public var solver: Solver?
    public let velocity = AnimationProperty<Value>()

    open override func update(dt: TimeInterval) {
        if solver?.solve(dt: dt) != false {
            finish()
        }
    }

    open override func didEnd(finished: Bool) {
        super.didEnd(finished: finished)
        velocity.vector = Value.Vector()
        solver = nil
    }

    open override func setTo(_ value: Value) {
        updateWithCurrentState()
        if solver as? VelocitySmoother<Value> == nil {
            solver = VelocitySmoother<Value>(value: self.value, velocity: velocity)
        }
        super.setTo(value)
        start()
    }
}
