import AppKit
import Testing
@testable import Ghostty

@MainActor
struct KeyboardLayoutTests {
    @Test(arguments: [
        0x00, // W3C KeyA
        0x12, // W3C Digit1
        0x32, // W3C Backquote
    ])
    func characterHandlesKeyCode(keyCode: UInt16) {
        #expect(KeyboardLayout.character(for: keyCode, modifiers: []) != nil)
    }

    @Test func characterRejectsInvalidKeyCode() {
        #expect(KeyboardLayout.character(for: UInt16.max, modifiers: []) == nil)
    }

    @Test(arguments: [
        ([.shift, .control, .option], []),
        ([.command, .shift, .control, .option], .command),
    ] as [(NSEvent.ModifierFlags, NSEvent.ModifierFlags)])
    func characterUsesOnlyCommandModifier(
        modifiers: NSEvent.ModifierFlags,
        effectiveModifiers: NSEvent.ModifierFlags
    ) throws {
        let keyCode: UInt16 = 0x00 // W3C KeyA
        let expected = try #require(KeyboardLayout.character(
            for: keyCode,
            modifiers: effectiveModifiers))
        let actual = try #require(KeyboardLayout.character(
            for: keyCode,
            modifiers: modifiers))
        #expect(actual == expected)
    }
}