import AppKit
import Testing
@testable import Conjure

@Test @MainActor func emojiBordersFollowSelectionAndHover() throws {
    _ = NSApplication.shared
    let suite = "EmojiBorders.\(UUID().uuidString)"
    let defaults = UserDefaults(suiteName: suite)!
    defer { defaults.removePersistentDomain(forName: suite) }
    let picker = EmojiPickerController(defaults: defaults)
    picker.input = { "face" }
    let window = NSWindow(contentRect: NSRect(x: 0, y: 0, width: 750, height: 400),
                          styleMask: [.borderless], backing: .buffered, defer: false)
    window.contentView = picker.view
    picker.view.layoutSubtreeIfNeeded()
    let scroll = try #require(picker.view.subviews.compactMap { $0 as? NSScrollView }.first)
    let grid = try #require(scroll.documentView as? NSCollectionView)
    let first = try #require(grid.item(at: IndexPath(item: 0, section: 0))?.view as? NSButton)
    let second = try #require(grid.item(at: IndexPath(item: 1, section: 0))?.view as? NSButton)
    let enter = try #require(NSEvent.enterExitEvent(with: .mouseEntered, location: .zero,
        modifierFlags: [], timestamp: 0, windowNumber: window.windowNumber,
        context: nil, eventNumber: 0, trackingNumber: 0, userData: nil))
    let exit = try #require(NSEvent.enterExitEvent(with: .mouseExited, location: .zero,
        modifierFlags: [], timestamp: 0, windowNumber: window.windowNumber,
        context: nil, eventNumber: 0, trackingNumber: 0, userData: nil))
    first.mouseExited(with: exit)
    second.mouseExited(with: exit)
    #expect(first.layer?.borderWidth == 0.5)
    #expect(second.layer?.borderWidth == 0)
    second.mouseEntered(with: enter)
    #expect(second.layer?.borderWidth == 0.5)
    picker.moveSelection(by: 1)
    #expect(first.layer?.borderWidth == 0)
    second.mouseExited(with: exit)
    #expect(second.layer?.borderWidth == 0.5)
    picker.moveSelection(by: -1)
    #expect(second.layer?.borderWidth == 0)
    first.mouseEntered(with: enter)
    picker.moveSelection(by: 1)
    #expect(first.layer?.borderWidth == 0.5)
    first.mouseExited(with: exit)
    #expect(first.layer?.borderWidth == 0)
}