import Foundation
import Shared
import UIKit
import WebKit

extension WebViewController: WebViewControllerProtocol {
    var canGoBack: Bool {
        webView.canGoBack
    }

    var canGoForward: Bool {
        webView.canGoForward
    }

    @objc func goBack() {
        webView.goBack()
    }

    @objc func goForward() {
        webView.goForward()
    }

    var overlayedController: UIViewController? {
        presentedViewController
    }

    func presentOverlayController(controller: UIViewController, animated: Bool) {
        DispatchQueue.main.async { [weak self] in
            self?.dismissOverlayController(animated: false, completion: { [weak self] in
                self?.present(controller, animated: animated, completion: nil)
            })
        }
    }

    func presentAlertController(controller: UIViewController, animated: Bool) {
        DispatchQueue.main.async { [weak self] in
            guard let self else { return }
            if let overlayedController {
                overlayedController.present(controller, animated: animated, completion: nil)
            } else {
                present(controller, animated: animated, completion: nil)
            }
        }
    }

    func evaluateJavaScript(_ script: String, completion: ((Any?, (any Error)?) -> Void)?) {
        webView.evaluateJavaScript(script, completionHandler: completion)
    }

    func dismissOverlayController(animated: Bool, completion: (() -> Void)?) {
        dismissAllViewControllersAbove(completion: completion)
    }

    func dismissControllerAboveOverlayController() {
        overlayedController?.dismissAllViewControllersAbove()
    }

    func updateFrontendConnectionState(state: String) {
        emptyStateTimer?.invalidate()
        emptyStateTimer = nil

        let state = FrontEndConnectionState(rawValue: state) ?? .unknown
        isConnected = state == .connected

        // Possible values: connected, disconnected, auth-invalid
        if state == .connected {
            hideEmptyState()
        } else {
            // Start a 10-second timer. If not interrupted by a 'connected' state, set alpha to 1.
            emptyStateTimer = Timer.scheduledTimer(withTimeInterval: 10, repeats: false) { [weak self] _ in
                self?.showEmptyState()
            }
        }
    }

    func navigateToPath(path: String) {
        if let activeURL = server.info.connection.activeURL(), let url = URL(string: activeURL.absoluteString + path) {
            load(request: URLRequest(url: url))
        }
    }

    func load(request: URLRequest) {
        Current.Log.verbose("Requesting webView navigation to \(String(describing: request.url?.absoluteString))")
        webView.load(request)
    }

    @objc func refresh() {
        let refreshBlock: () -> Void = { [weak self] in
            guard let self else { return }
            // called via menu/keyboard shortcut too
            if let webviewURL = server.info.connection.webviewURL() {
                if webView.url?.baseIsEqual(to: webviewURL) == true, !lastNavigationWasServerError {
                    reload()
                } else {
                    load(request: URLRequest(url: webviewURL))
                }
                hideNoActiveURLError()
            } else {
                showNoActiveURLError()
            }
        }

        if Current.isCatalyst {
            refreshBlock()
        } else {
            Current.connectivity.syncNetworkInformation {
                refreshBlock()
            }
        }
        updateDatabaseAndPanels()
    }
}