/*
Copyright 2019-2024 New Vector Ltd.

SPDX-License-Identifier: AGPL-3.0-only
Please see LICENSE in the repository root for full details.
 */

import UIKit

/// Availbale options for present method
struct SlidingModalOption: OptionSet {
    let rawValue: UInt32

    /// Is content view spanning the screen width and to the bottom
    static let spanning         = SlidingModalOption(rawValue: 1 << 0)
    /// the background is blurred in order to obfuscate the view behind the popup
    static let blurBackground   = SlidingModalOption(rawValue: 1 << 1)
    /// center content in screen
    static let centerInScreen   = SlidingModalOption(rawValue: 1 << 2)
}

/// `SlidingModalPresenter` allows to present a custom UIViewController or UIView conforming to `SlidingModalPresentable` as a modal with a vertical sliding animation from a UIViewController.
final class SlidingModalPresenter: NSObject {
    
    // MARK: - Constants
    
    private enum TabletContentSize {
        static let preferred = CGSize(width: 400.0, height: 400.0)
        static let minHeight: CGFloat = 0.0
        static let maxHeight: CGFloat = 600.0
    }
    
    // MARK: - Properties

    // swiftlint:disable weak_delegate
    private var transitionDelegate: SlidingModalPresentationDelegate?
    // swiftlint:enable weak_delegate
    private weak var presentingViewController: UIViewController?
    
    // MARK: - Presentation options

    @objc static let NoOption: UInt32 = 0
    @objc static let SpanningOption: UInt32 = SlidingModalOption.spanning.rawValue
    @objc static let BlurBackgroungOption: UInt32 = SlidingModalOption.blurBackground.rawValue
    @objc static let CenterInScreenOption: UInt32 = SlidingModalOption.centerInScreen.rawValue

    // MARK: - Public
    
    @objc func present(_ viewController: SlidingModalPresentable.ViewControllerType, from presentingViewController: UIViewController, animated: Bool, completion: (() -> Void)?) {
        self.present(viewController, from: presentingViewController, animated: animated, options: [], completion: completion)
    }
    
    @objc func present(_ viewController: SlidingModalPresentable.ViewControllerType, from presentingViewController: UIViewController, animated: Bool, options: UInt32, completion: (() -> Void)?) {
        self.present(viewController, from: presentingViewController, animated: animated, options: SlidingModalOption(rawValue: options), completion: completion)
    }
    
    func present(_ viewController: SlidingModalPresentable.ViewControllerType, from presentingViewController: UIViewController, animated: Bool, options: SlidingModalOption, completion: (() -> Void)?) {
        
        MXLog.debug("[SlidingModalPresenter] present \(type(of: viewController))")
        
        let transitionDelegate = SlidingModalPresentationDelegate(options: options)
        
        viewController.modalPresentationStyle = .custom
        viewController.transitioningDelegate = transitionDelegate
        
        // Presented view controller does not affect the statusbar appearance
        viewController.modalPresentationCapturesStatusBarAppearance = false
        
        self.transitionDelegate = transitionDelegate
        
        presentingViewController.present(viewController, animated: animated, completion: completion)
        
        self.presentingViewController = presentingViewController
    }
    
    @objc func presentView(_ view: SlidingModalPresentable.ViewType, from viewControllerPresenter: UIViewController, animated: Bool, completion: (() -> Void)?) {
        
        MXLog.debug("[SlidingModalPresenter] presentView \(type(of: view))")
        
        let viewController = SlidingModalEmptyViewController.instantiate(with: view)
        self.present(viewController, from: viewControllerPresenter, animated: animated, completion: completion)
    }
    
    @objc func presentView(_ view: SlidingModalPresentable.ViewType, from viewControllerPresenter: UIViewController, animated: Bool, options: UInt32, completion: (() -> Void)?) {
        
        MXLog.debug("[SlidingModalPresenter] presentView \(type(of: view))")
        
        let viewController = SlidingModalEmptyViewController.instantiate(with: view)
        self.present(viewController, from: viewControllerPresenter, animated: animated, options: SlidingModalOption(rawValue: options), completion: completion)
    }
    
    @objc func dismiss(animated: Bool, completion: (() -> Void)?) {
        self.presentingViewController?.dismiss(animated: animated, completion: completion)
    }
}