import Testing
@testable import VNCUI
import CoreGraphics

@Suite struct InputMapperTests {
    @Test func centerOfViewMapsToCenterOfFramebuffer() {
        let mapper = InputMapper()
        let fb = CGSize(width: 1920, height: 1080)
        let view = CGSize(width: 192, height: 108)
        let normalized = mapper.normalize(viewPoint: CGPoint(x: 96, y: 54),
                                          in: view,
                                          framebufferSize: fb)
        #expect(normalized != nil)
        #expect(abs((normalized?.x ?? 0) - 0.5) < 0.001)
        #expect(abs((normalized?.y ?? 0) - 0.5) < 0.001)
    }

    @Test func aspectFitLetterboxesTallerView() {
        let mapper = InputMapper()
        let fb = CGSize(width: 1600, height: 900)        // 16:9
        let view = CGSize(width: 800, height: 800)        // 1:1
        let displayed = mapper.displayedRect(for: fb, in: view)
        #expect(displayed != nil)
        #expect(abs((displayed?.width ?? 0) - 800) < 0.001)
        #expect(abs((displayed?.height ?? 0) - 450) < 0.001)
        #expect(abs((displayed?.origin.y ?? 0) - 175) < 0.001)
    }

    @Test func aspectFitPillarboxesWiderView() {
        let mapper = InputMapper()
        let fb = CGSize(width: 800, height: 800)
        let view = CGSize(width: 1600, height: 900)
        let displayed = mapper.displayedRect(for: fb, in: view)
        #expect(displayed != nil)
        #expect(abs((displayed?.height ?? 0) - 900) < 0.001)
        #expect(abs((displayed?.width ?? 0) - 900) < 0.001)
        #expect(abs((displayed?.origin.x ?? 0) - 350) < 0.001)
    }

    @Test func roundTripNormalizationIsStable() {
        let mapper = InputMapper()
        let fb = CGSize(width: 1920, height: 1080)
        let view = CGSize(width: 800, height: 600)
        let target = CGPoint(x: 0.25, y: 0.75)
        let viewPoint = mapper.viewPoint(forNormalized: target,
                                         in: view,
                                         framebufferSize: fb)
        let normalized = mapper.normalize(viewPoint: viewPoint ?? .zero,
                                          in: view,
                                          framebufferSize: fb)
        #expect(normalized != nil)
        #expect(abs((normalized?.x ?? 0) - target.x) < 0.001)
        #expect(abs((normalized?.y ?? 0) - target.y) < 0.001)
    }
}