import ConjureKit
import Foundation
import Testing

@Test
func launcherAlignmentPositionsWindowEdgesOnOffsetDisplaysAndTracksWindowSize() {
    let display = CGRect(x: -1920, y: 40, width: 1920, height: 1040)
    let window = CGRect(x: -1500, y: 450, width: 750, height: 474)
    let alignment = LauncherAlignment(windowFrame: window, visibleFrame: display)
    #expect(alignment.targetFrame == CGRect(x: -1335, y: 398, width: 750, height: 474))
    #expect(alignment.snappedOrigin == window.origin)
    let resized = LauncherAlignment(windowFrame: CGRect(x: -1500, y: 400, width: 840, height: 500), visibleFrame: display)
    #expect(resized.targetFrame == CGRect(x: -1380, y: 372, width: 840, height: 500))
}

@Test
func launcherAlignmentSnapsAxesIndependentlyAtBothThresholdBoundaries() {
    let display = CGRect(x: 0, y: 0, width: 1500, height: 1000)
    let target = CGPoint(x: 375, y: 326)
    for offset: CGFloat in [-12, 12] {
        let horizontal = LauncherAlignment(windowFrame: CGRect(x: target.x + offset, y: target.y + 40, width: 750, height: 474), visibleFrame: display)
        #expect(horizontal.snappedOrigin == CGPoint(x: target.x, y: target.y + 40))
        let vertical = LauncherAlignment(windowFrame: CGRect(x: target.x + 40, y: target.y + offset, width: 750, height: 474), visibleFrame: display)
        #expect(vertical.snappedOrigin == CGPoint(x: target.x + 40, y: target.y))
    }
    let both = LauncherAlignment(windowFrame: CGRect(x: target.x - 6, y: target.y + 9, width: 750, height: 474), visibleFrame: display)
    #expect(both.snappedOrigin == target)
}

@Test
func launcherAlignmentReleasesOutsideEitherSideOfTheSnapThreshold() {
    let display = CGRect(x: 0, y: 0, width: 1500, height: 1000)
    for offset: CGFloat in [-12.01, 12.01] {
        let window = CGRect(x: 375 + offset, y: 326 + offset, width: 750, height: 474)
        #expect(LauncherAlignment(windowFrame: window, visibleFrame: display).snappedOrigin == window.origin)
    }
}

@Test
func launcherAlignmentKeepsFractionalDisplayCentersOnAStableWindowGrid() {
    let display = CGRect(x: 0, y: 0, width: 1512, height: 949)
    let window = CGRect(x: 390, y: 280, width: 750, height: 474)
    let alignment = LauncherAlignment(windowFrame: window, visibleFrame: display)
    #expect(alignment.targetFrame == CGRect(x: 381, y: 285, width: 750, height: 474))
    #expect(alignment.snappedOrigin == CGPoint(x: 381, y: 285))
    let placed = CGRect(origin: alignment.snappedOrigin, size: window.size)
    #expect(LauncherAlignment(windowFrame: placed, visibleFrame: display).snappedOrigin == placed.origin)
}

@Test
func launcherPositionRestoresVisibleOriginsAndFallsBackForMissingOrOffscreenPositions() {
    let display = CGRect(x: -1920, y: 40, width: 1920, height: 1040)
    let size = CGSize(width: 750, height: 474)
    let origin = CGPoint(x: -1500, y: 450)
    #expect(LauncherAlignment.restoredFrame(savedOrigin: origin, windowSize: size, visibleFrame: display)
        == CGRect(origin: origin, size: size))
    for invalid: CGPoint? in [nil, CGPoint(x: 0, y: 450), CGPoint(x: -1500, y: 39), CGPoint(x: CGFloat.nan, y: 450)] {
        #expect(LauncherAlignment.restoredFrame(savedOrigin: invalid, windowSize: size, visibleFrame: display)
            == CGRect(x: -1335, y: 398, width: 750, height: 474))
    }
    let small = CGRect(x: 0, y: 40, width: 800, height: 500)
    #expect(LauncherAlignment.restoredFrame(savedOrigin: nil, windowSize: size, visibleFrame: small)
        == CGRect(x: 25, y: 40, width: 750, height: 474))
}