/*
 * Atoll (DynamicIsland)
 * Copyright (C) 2024-2026 Atoll Contributors
 *
 * Originally from boring.notch project
 * Modified and adapted for Atoll (DynamicIsland)
 * See NOTICE for details.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

import KeyboardShortcuts
import SwiftUI
import Carbon


extension View {
    
    public func keyboardShortcut(_ shortcut: KeyboardShortcuts.Name) -> some View {
        if let shortcut = shortcut.shortcut {
            if let keyEquivalent = shortcut.toKeyEquivalent() {
                return AnyView(self.keyboardShortcut(keyEquivalent, modifiers: shortcut.toEventModifiers()))
            }
        }
        
        return AnyView(self)
    }
    
}

extension KeyboardShortcuts.Shortcut {
    
    func toKeyEquivalent() -> KeyEquivalent? {
        let carbonKeyCode = UInt16(self.carbonKeyCode)
        let maxNameLength = 4
        var nameBuffer = [UniChar](repeating: 0, count : maxNameLength)
        var nameLength = 0
        
        let modifierKeys = UInt32(alphaLock >> 8) & 0xFF // Caps Lock
        var deadKeys: UInt32 = 0
        let keyboardType = UInt32(LMGetKbdType())
        
        let source = TISCopyCurrentKeyboardLayoutInputSource().takeRetainedValue()
        guard let ptr = TISGetInputSourceProperty(source, kTISPropertyUnicodeKeyLayoutData) else {
            NSLog("Could not get keyboard layout data")
            return nil
        }
        let layoutData = Unmanaged<CFData>.fromOpaque(ptr).takeUnretainedValue() as Data
        let osStatus = layoutData.withUnsafeBytes {
            UCKeyTranslate($0.bindMemory(to: UCKeyboardLayout.self).baseAddress, carbonKeyCode, UInt16(kUCKeyActionDown),
                           modifierKeys, keyboardType, UInt32(kUCKeyTranslateNoDeadKeysMask),
                           &deadKeys, maxNameLength, &nameLength, &nameBuffer)
        }
        guard osStatus == noErr else {
            NSLog("Code: 0x%04X  Status: %+i", carbonKeyCode, osStatus);
            return nil
        }
        
        return KeyEquivalent(Character(String(utf16CodeUnits: nameBuffer, count: nameLength)))
    }
    
    func toEventModifiers() -> SwiftUI.EventModifiers {
        var modifiers: SwiftUI.EventModifiers = []
        
        if self.modifiers.contains(NSEvent.ModifierFlags.command) {
            modifiers.update(with: EventModifiers.command)
        }
        
        if self.modifiers.contains(NSEvent.ModifierFlags.control) {
            modifiers.update(with: EventModifiers.control)
        }
        
        if self.modifiers.contains(NSEvent.ModifierFlags.option) {
            modifiers.update(with: EventModifiers.option)
        }
        
        if self.modifiers.contains(NSEvent.ModifierFlags.shift) {
            modifiers.update(with: EventModifiers.shift)
        }
        
        if self.modifiers.contains(NSEvent.ModifierFlags.capsLock) {
            modifiers.update(with: EventModifiers.capsLock)
        }
        
        if self.modifiers.contains(NSEvent.ModifierFlags.numericPad) {
            modifiers.update(with: EventModifiers.numericPad)
        }
        
        return modifiers
    }
    
}