import AtomicTransition
import SwiftUI

extension AnyNavigationTransition {
	/// A transition that moves both views in and out along the specified axis.
	///
	/// This transition:
	/// - Pushes views right-to-left and pops views left-to-right when `axis` is `horizontal`.
	/// - Pushes views bottom-to-top and pops views top-to-bottom when `axis` is `vertical`.
	public static func slide(axis: Axis) -> Self {
		.init(Slide(axis: axis))
	}
}

extension AnyNavigationTransition {
	/// Equivalent to `slide(axis: .horizontal)`.
	@inlinable
	public static var slide: Self {
		.slide(axis: .horizontal)
	}
}

/// A transition that moves both views in and out along the specified axis.
///
/// This transition:
/// - Pushes views right-to-left and pops views left-to-right when `axis` is `horizontal`.
/// - Pushes views bottom-to-top and pops views top-to-bottom when `axis` is `vertical`.
public struct Slide: NavigationTransition {
	private let axis: Axis

	public init(axis: Axis) {
		self.axis = axis
	}

	/// Equivalent to `Move(axis: .horizontal)`.
	@inlinable
	public init() {
		self.init(axis: .horizontal)
	}

	public var body: some NavigationTransition {
		switch axis {
		case .horizontal:
			MirrorPush {
				OnInsertion {
					Move(edge: .trailing)
				}
				OnRemoval {
					Move(edge: .leading)
				}
			}
		case .vertical:
			MirrorPush {
				OnInsertion {
					Move(edge: .bottom)
				}
				OnRemoval {
					Move(edge: .top)
				}
			}
		}
	}
}

extension Slide: Hashable {}