//Copyright (c) 2018 pikachu987 <pikachu77769@gmail.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 UIKit

public extension Array where Element == CGColor {
    public func gradation(_ orientation: GradationOrientation, size: CGSize) -> UIImage? {
        UIGraphicsBeginImageContext(size)
        defer { UIGraphicsEndImageContext() }
        guard let context = UIGraphicsGetCurrentContext() else { return nil }
        UIGraphicsPushContext(context)
        
        guard let gradient = CGGradient(colorsSpace: CGColorSpaceCreateDeviceRGB(), colors: self as CFArray, locations: nil) else { return nil }
        context.drawLinearGradient(gradient, start: orientation.startPoint(size), end: orientation.endPoint(size), options: [])
        
        UIGraphicsPopContext()
        return UIGraphicsGetImageFromCurrentImageContext()
    }
}

public extension Array where Element == UIColor {
    public func gradation(_ orientation: GradationOrientation, size: CGSize) -> UIImage? {
        return self.map({ $0.cgColor }).gradation(orientation, size: size)
    }
}