//
//  AppRouter.swift
//  Alamofire
//
//  Created by osell on 2023/2/7.
//

import Foundation
import URLNavigator

public typealias RouterParameter = [String : Any]
public typealias CustomHandlerFactory = (String, RouterParameter?) -> Bool
public typealias ContextHander = (String, RouterParameter) -> UIViewController?

public protocol AppRouterProtocol: CustomStringConvertible {
    func setupRegisterRouter()
    func setupHandlerRouter()
}

@objcMembers
public class AppRouter: NSObject {
    
    public static let shared = AppRouter()

    private let navigator: Navigator
    
    static var globalRouteHandler: CustomHandlerFactory?
    
    var rootViewController: UIViewController? {
        return UIViewController.topMost
    }
    
    var navigationController: UINavigationController? {
        return UIViewController.topMost?.navigationController
    }
    
    override init() {
        self.navigator = Navigator()
        super.init()
    }
    
    public func setup() {
        if let this = self as? AppRouterProtocol {
            this.setupRegisterRouter()
            this.setupHandlerRouter()
        }
    }
}

// MARK: - Register/Handler
public extension AppRouter {
    
    /// 注册路由
    /// - Parameters:
    ///   - router: 路由
    ///   - factory: ViewControllerFactory
    class func register(_ router: RouterTarget, factory: @escaping ContextHander) {
        AppRouter.shared.navigator.register(router.url) { _, values, context in
            var values = values
            if let userInfo = context as? RouterParameter {
                values.merge(userInfo, uniquingKeysWith: { value1, value2 in value2 })
            }
            return factory(router.url, values)
        }
    }
    
    /// 处理单个路由
    /// - Parameters:
    ///   - router: 路由
    ///   - factory: URLOpenHandlerFactory
    class func handle(_ router: RouterTarget, _ factory: @escaping CustomHandlerFactory) {
        AppRouter.shared.navigator.handle(router.url) { _, values, context in
            var values = values
            if let userInfo = context as? RouterParameter {
                values.merge(userInfo, uniquingKeysWith: { value1, value2 in value2 })
            }
            return factory(router.url, values)
        }
    }
    
    /// 处理全局路由设置
    /// - Parameter handler: CustomHandlerFactory
    class func globalRouteHandler(_ handler: CustomHandlerFactory?) {
        AppRouter.globalRouteHandler = handler
    }
    
    /// 是否注册过路由
    /// - Parameter url: 路由url
    /// - Returns: true/false
    class func isRegisterRouter(_ url: String, userInfo: RouterParameter?) -> Bool {
        AppRouter.viewController(url, userInfo: userInfo) != nil
    }
    
    class func viewController(_ url: String, userInfo: RouterParameter?) -> UIViewController? {
        AppRouter.shared.navigator.viewController(for: url, context: userInfo)
    }
}

// MARK: - Push/Present
public extension AppRouter {
    
    /// Router RouteTarget Push
    /// - Parameters:
    ///   - router: RouterTarget
    ///   - isHandler: 是否处理
    ///   - userInfo: 参数
    /// - Returns: UIViewController
    @discardableResult
    class func push(_ router: RouterTarget,
                     userInfo: RouterParameter? = nil) -> UIViewController? {
        var params = RouterParameter()
        if let parameters = userInfo {
            params = params.merging(parameters) { _, value2 in value2 }
        }
        guard AppRouter.globalRouteHandler?(router.url, params) == true else {
            return nil
        }
        return AppRouter.shared.navigator.push(router.url, context: params)
    }
    
    /// Router URLString Push
    /// - Parameters:
    ///   - router: URL String
    ///   - isHandler: 是否处理
    ///   - userInfo: 参数
    /// - Returns: UIViewController
    @discardableResult
    class func push(_ url: String,
                    userInfo: RouterParameter? = nil) -> UIViewController? {
        let url = url.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""
        guard let urlURL = URL(string: url) else { return nil }
        var params = urlURL.queryParameters as RouterParameter
        if let parameters = userInfo {
            params = params.merging(parameters) { _, value2 in value2 }
        }
        guard AppRouter.globalRouteHandler?(url, params) == true else {
            return nil
        }
        return AppRouter.shared.navigator.push(url, context: params)
    }
    
    /// Pushes the view controller to the navigation controller stack.
    ///
    /// - note: It is not a good idea to use this method directly because this method requires all
    ///         parameters. This method eventually gets called when pushing a view controller, so
    ///         it's recommended to implement this method only for mocking.
    @discardableResult
    class func push(_ viewController: UIViewController, from: UINavigationControllerType? = nil, animated: Bool = true) -> UIViewController? {
        return AppRouter.shared.navigator.push(viewController, from: from, animated: animated)
    }
    
    /// Router RouteTarget Present
    /// - Parameters:
    ///   - router: RouterTarget
    ///   - isHandler: 是否处理
    ///   - userInfo: 参数
    /// - Returns: UIViewController
    @discardableResult
    class func present(_ router: RouterTarget,
                     userInfo: RouterParameter? = nil,
                     completion: (() -> Void)? = nil) -> UIViewController? {
        
        var params = RouterParameter()
        if let parameters = userInfo {
            params = params.merging(parameters) { _, value2 in value2 }
        }
        guard AppRouter.globalRouteHandler?(router.url, params) == true else {
            return nil
        }
        return AppRouter.shared.navigator.present(router.url, context: params, completion: completion)
    }
    
    /// Router URLString Present
    /// - Parameters:
    ///   - router: URL String
    ///   - isHandler: 是否处理
    ///   - userInfo: 参数
    /// - Returns: UIViewController
    @discardableResult
    class func present(_ url: String,
                    userInfo: RouterParameter? = nil,
                    completion: (() -> Void)? = nil) -> UIViewController? {
        let url = url.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""
        guard let urlURL = URL(string: url) else { return nil }
        var params = urlURL.queryParameters as RouterParameter
        if let parameters = userInfo {
            params = params.merging(parameters) { _, value2 in value2 }
        }
        guard AppRouter.globalRouteHandler?(url, params) == true else {
            return nil
        }
        return AppRouter.shared.navigator.present(url, context: params, completion: completion)
    }
    
    /// Router URLString Present
    /// - Parameters:
    ///   - viewController: viewController
    ///   - animated:
    ///   - completion:
    /// - Returns: UIViewController
    @discardableResult
    class func present(_ viewController: UIViewController, animated: Bool = true, completion: (() -> Void)? = nil) -> UIViewController? {
        return AppRouter.shared.navigator.present(viewController, animated: animated, completion: completion)
    }
    
    func popOrDismiss() {
        if navigationController?.viewControllers.count == 1 &&
            navigationController?.presentingViewController != nil {
            navigationController?.dismiss(animated: true, completion: nil)
        } else {
            navigationController?.popViewController(animated: true)
        }
    }
    
    func popToRoot() {
        navigationController?.popToRootViewController(animated: true)
    }
}