import CoreGraphics
import Foundation

@main
struct ImageCropGeometryCheck {
    static func main() {
        assertSize(
            ImageCropGeometry.maximumCropSize(fitting: CGSize(width: 350, height: 700), aspectRatio: 1),
            equals: CGSize(width: 350, height: 350),
            scenario: "portraitUsesFullWidth"
        )
        assertSize(
            ImageCropGeometry.maximumCropSize(fitting: CGSize(width: 400, height: 200), aspectRatio: 4.0 / 3.0),
            equals: CGSize(width: 800.0 / 3.0, height: 200),
            scenario: "landscapeUsesFullHeight"
        )
        assertSize(
            ImageCropGeometry.maximumCropSize(fitting: CGSize(width: 320, height: 180), aspectRatio: 16.0 / 9.0),
            equals: CGSize(width: 320, height: 180),
            scenario: "matchingRatioUsesWholeImage"
        )
        assertSize(
            ImageCropGeometry.maximumCropSize(fitting: .zero, aspectRatio: 1),
            equals: .zero,
            scenario: "invalidInputReturnsZero"
        )
        assertSize(
            ImageCropGeometry.maximumCropSize(fitting: CGSize(width: 100, height: 100), aspectRatio: 0),
            equals: .zero,
            scenario: "invalidRatioReturnsZero"
        )
        print("ImageCropGeometryCheck PASS")
    }

    private static func assertSize(_ actual: CGSize, equals expected: CGSize, scenario: String) {
        let tolerance = 0.001
        precondition(abs(actual.width - expected.width) < tolerance, "\(scenario) width: \(actual.width)")
        precondition(abs(actual.height - expected.height) < tolerance, "\(scenario) height: \(actual.height)")
    }
}