//
//  IQKeyboardToolbarManager.swift
//  https://github.com/hackiftekhar/IQKeyboardToolbarManager
//  Copyright (c) 2013-24 Iftekhar Qurashi.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.

import UIKit
import IQTextInputViewNotification
import IQKeyboardCore
import IQKeyboardToolbar
import Combine

@available(iOSApplicationExtension, unavailable)
@MainActor
@objcMembers public final class IQKeyboardToolbarManager: NSObject {

    private let textInputViewObserver: IQTextInputViewNotification = .init()
    private var storage: Set<AnyCancellable> = []

    internal var textInputView: (some IQTextInputView)? {
        textInputViewObserver.textInputView
    }

    /**
     Returns the default singleton instance.
     */
    @MainActor
    @objc public static let shared: IQKeyboardToolbarManager = .init()

    /**
     Automatic add the toolbar functionality. Default is false.
     */
    public var isEnabled: Bool = false {
        didSet {
            reloadInputViews()
            showLog("isEnabled: \(isEnabled ? "Yes" : "NO")")
        }
    }

    public var isDebuggingEnabled: Bool = false

    /**
     Configurations related to the toolbar display over the keyboard.
     */
    public let toolbarConfiguration: IQKeyboardToolbarConfiguration = .init()

    // MARK: UISound handling

    /**
     If YES, then it plays inputClick sound on next/previous/done click.
     */
    public var playInputClicks: Bool = true

    /**
     Disable automatic toolbar creation within the scope of disabled toolbar viewControllers classes.
     Within this scope, 'isEnabled' property is ignored. Class should be kind of UIViewController.
     */
    public var disabledToolbarClasses: [UIViewController.Type] = [
        UIAlertController.self,
        UIInputViewController.self
    ]

    /**
     Enable automatic toolbar creation within the scope of enabled toolbar viewControllers classes.
     Within this scope, 'isEnabled' property is ignored. Class should be kind of UIViewController.
     If same Class is added in disabledToolbarClasses list, then enabledToolbarClasses will be ignore.
     */
    public var enabledToolbarClasses: [UIViewController.Type] = []

    /**
     Allowed subclasses of UIView to add all inner textInputView,
     this will allow to navigate between textInputView contains in different superview.
     Class should be kind of UIView.
     */
    public var deepResponderAllowedContainerClasses: [UIView.Type] = [
        UITableView.self,
        UICollectionView.self,
        IQDeepResponderContainerView.self
    ]

    internal var logIndentation = 0

    internal override init() {
        super.init()

        addTextInputViewObserver()
        addBecomeActiveObserver()

        // (Bug ID: #550)
        // Loading IQKeyboardToolbar, IQTitleBarButtonItem, IQBarButtonItem to fix first time keyboard appearance delay
        // If you experience exception breakpoint issue at below line then try these solutions
        // https://stackoverflow.com/questions/27375640/all-exception-break-point-is-stopping-for-no-reason-on-simulator
        DispatchQueue.main.async {
            let textInputView: UITextField = UITextField()
            textInputView.iq.addDone(target: nil, action: #selector(self.doneAction(_:)))
            textInputView.iq.addPreviousNextDone(target: nil,
                                                 previousAction: #selector(self.previousAction(_:)),
                                                 nextAction: #selector(self.nextAction(_:)),
                                                 doneAction: #selector(self.doneAction(_:)))
        }
    }
}

@available(iOSApplicationExtension, unavailable)
@MainActor
private extension IQKeyboardToolbarManager {

    private func removeTextInputViewObserver() {
        textInputViewObserver.unsubscribe(identifier: "IQKeyboardToolbarManager")
    }

    private func addTextInputViewObserver() {
        textInputViewObserver.subscribe(identifier: "IQKeyboardToolbarManager",
                                        changeHandler: { [weak self] event, textInputView in
            guard let self = self else { return }
            guard (textInputView as UIView).iq.isAlertViewTextField() == false else {
                return
            }

            switch event {
            case .beginEditing:
                reloadInputViews()
            case .endEditing:
                removeToolbarIfRequired(of: textInputView)
            }
        })
    }
}

@available(iOSApplicationExtension, unavailable)
@MainActor
private extension IQKeyboardToolbarManager {

    private func removeBecomeActiveObserver() {
        storage.forEach { $0.cancel() }
        storage.removeAll()
   }

    private func addBecomeActiveObserver() {
        let beginEditingNotificationNames: [Notification.Name] = [
            UIApplication.didBecomeActiveNotification
        ]

        for notificationName in beginEditingNotificationNames {
            NotificationCenter.default.publisher(for: notificationName)
                .sink(receiveValue: { [weak self] info in
                    guard let self = self else { return }

                    // In SwiftUI View's when app comes from background to foreground
                    // The inputAccessoryView was getting removed in iOS 26. So forcing to reload.
                    self.reloadInputViews()
                })
                .store(in: &storage)
        }
    }
}
