//
//  AppRouter.swift
//  Tusker
//
//  Created by Shadowfacts on 10/20/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import Pachyderm
import SafariServices

class AppRouter {
    
    let rootViewController: UIViewController
    var currentViewController: UIViewController {
        return getContentViewController(from: rootViewController)
    }
    
    init(root: UIViewController) {
        self.rootViewController = root
    }
    
    private func getContentViewController(from vc: UIViewController) -> UIViewController {
        if let vc = vc as? UITabBarController,
            let selected = vc.selectedViewController {
            return getContentViewController(from: selected)
        } else if let vc = vc as? UINavigationController,
            let top = vc.topViewController {
            return getContentViewController(from: top)
        } else {
            return vc
        }
    }
    
    func present(_ vc: UIViewController, animated: Bool) {
        if currentViewController.presentingViewController != nil {
            currentViewController.dismiss(animated: animated) {
                self.present(vc, animated: animated)
            }
        }
        currentViewController.present(vc, animated: animated)
    }
    
    func push(_ vc: UIViewController, animated: Bool) {
        if currentViewController.presentingViewController != nil {
            currentViewController.dismiss(animated: animated) {
                self.push(vc, animated: animated)
            }
        }
        guard let nav = currentViewController.navigationController else { fatalError("Can't push view controller while not in navigation controller") }
        nav.pushViewController(vc, animated: animated)
    }
    
    func profile(for accountID: String) -> ProfileTableViewController {
        return ProfileTableViewController(accountID: accountID, router: self)
    }
    
    func profile(for mention: Mention) -> ProfileTableViewController {
        return ProfileTableViewController(accountID: mention.id, router: self)
    }
    
    func timeline(for timeline: Timeline) -> TimelineTableViewController {
        return TimelineTableViewController(for: timeline, router: self)
    }
    
    func timeline(tag: Hashtag) -> TimelineTableViewController {
        return timeline(for: .tag(hashtag: tag.name))
    }
    
    func safariViewController(for url: URL) -> SFSafariViewController {
        return SFSafariViewController(url: url)
    }
    
    func conversation(for statusID: String) -> ConversationTableViewController {
        return ConversationTableViewController(for: statusID, router: self)
    }
    
    func compose(inReplyTo inReplyToID: String? = nil, mentioningAcct: String? = nil, text: String? = nil) -> ComposeViewController {
        return ComposeViewController(inReplyTo: inReplyToID, mentioningAcct: mentioningAcct, text: text, router: self)
    }
    
    func largeImage(_ image: UIImage, description: String?, sourceFrame: CGRect, sourceCornerRadius: CGFloat, transitioningDelegate: UIViewControllerTransitioningDelegate?) -> LargeImageViewController {
        let vc = LargeImageViewController(image: image, description: description, sourceFrame: sourceFrame, sourceCornerRadius: sourceCornerRadius, router: self)
        vc.transitioningDelegate = transitioningDelegate
        return vc
    }
    
    func moreOptions(forStatus statusID: String) -> UIAlertController {
        guard let status = MastodonCache.status(for: statusID) else { fatalError("Missing cached status \(statusID)") }
        
        let alert = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        if let url = status.url {
            alert.addAction(UIAlertAction(title: "Open in Safari", style: .default, handler: { (_) in
                let vc = SFSafariViewController(url: url)
                self.present(vc, animated: true)
            }))
            alert.addAction(UIAlertAction(title: "Copy", style: .default, handler: { (_) in
                UIPasteboard.general.url = url
            }))
            alert.addAction(UIAlertAction(title: "Share...", style: .default, handler: { (_) in
                let vc = UIActivityViewController(activityItems: [url], applicationActivities: nil)
                self.present(vc, animated: true)
            }))
        }
        alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
        return alert
    }
    
    func moreOptions(forURL url: URL) -> UIAlertController {
        let alert = UIAlertController(title: nil, message: url.absoluteString, preferredStyle: .actionSheet)
        alert.addAction(UIAlertAction(title: "Open in Safari", style: .default, handler: { (_) in
            let vc = SFSafariViewController(url: url)
            self.present(vc, animated: true)
        }))
        alert.addAction(UIAlertAction(title: "Copy", style: .default, handler: { (_) in
            UIPasteboard.general.url = url
        }))
        alert.addAction(UIAlertAction(title: "Share...", style: .default, handler: { (_) in
            let vc = UIActivityViewController(activityItems: [url], applicationActivities: nil)
            self.present(vc, animated: true)
        }))
        alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
        return alert
    }
    
}