//
//  TuskerNavigationDelegate.swift
//  Tusker
//
//  Created by Shadowfacts on 9/30/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import SafariServices
import Pachyderm

protocol TuskerNavigationDelegate {
    func viewController(forAccount accountID: String) -> UIViewController
    
    func selected(account accountID: String)
    
    func viewController(forMention mention: Mention) -> UIViewController
    
    func selected(mention: Mention)
    
    func viewController(forTag tag: Hashtag) -> UIViewController
    
    func selected(tag: Hashtag)
    
    func viewController(forURL url: URL) -> UIViewController
    
    func selected(url: URL)
    
    func viewController(forStatus statusID: String) -> UIViewController
    
    func selected(status statusID: String)
    
    func reply(to statusID: String)
    
    func viewController(forImage image: UIImage, description: String?, animatingFrom originView: UIView) -> UIViewController
    
    func showLargeImage(_ image: UIImage, description: String?, animatingFrom originView: UIView)
    
    func showMoreOptions(forStatus statusID: String)
}

extension TuskerNavigationDelegate where Self: UIViewController {
    
    func viewController(forAccount accountID: String) -> UIViewController {
        return ProfileTableViewController.create(for: accountID)
    }
    
    func selected(account accountID: String) {
        // don't open if the account is the same as the current one
        if let profileController = self as? ProfileTableViewController,
            profileController.accountID == accountID {
            return
        }
        
        guard let navigationController = navigationController else {
            fatalError("Can't show profile VC when not in navigation controller")
        }
        let vc = viewController(forAccount: accountID)
        navigationController.pushViewController(vc, animated: true)
    }
    
    func viewController(forMention mention: Mention) -> UIViewController {
        return ProfileTableViewController.create(for: mention.id)
    }
    
    func selected(mention: Mention) {
        guard let navigationController = navigationController else {
            fatalError("Can't show profile VC from mention when not in navigation controller")
        }
        let vc = viewController(forMention: mention)
        navigationController.pushViewController(vc, animated: true)
    }
    
    func viewController(forTag tag: Hashtag) -> UIViewController {
        let timeline = Timeline.tag(hashtag: tag.name)
        return TimelineTableViewController.create(for: timeline)
    }
    
    func selected(tag: Hashtag) {
        guard let navigationController = navigationController else {
            fatalError("Can't show hashtag timeline when not in navigation controller")
        }
        let vc = viewController(forTag: tag)
        navigationController.pushViewController(vc, animated: true)
    }
    
    func viewController(forURL url: URL) -> UIViewController {
        return SFSafariViewController(url: url)
    }
    
    func selected(url: URL) {
        let vc = viewController(forURL: url)
        present(vc, animated: true)
    }
    
    func viewController(forStatus statusID: String) -> UIViewController {
        return ConversationViewController.create(for: statusID)
    }
    
    func selected(status statusID: String) {
        // don't open if the conversation is the same as the current one
        if let conversationController = self as? ConversationViewController,
            conversationController.mainStatusID == statusID {
            return
        }
        
        guard let navigationController = navigationController else {
            fatalError("Can't show conversation VC when not in navigation controller")
        }
        let vc = viewController(forStatus: statusID)
        navigationController.pushViewController(vc, animated: true)
    }
    
    func reply(to statusID: String) {
        let vc = ComposeViewController.create(inReplyTo: statusID)
        present(vc, animated: true)
    }
    
    func viewController(forImage image: UIImage, description: String?, animatingFrom originView: UIView) -> UIViewController {
        guard let self = self as? UIViewController & LargeImageViewControllerDelegate else {
            fatalError("Can't create large image view controller unless self is LargeImageViewControllerDelegate")
        }
        let vc = LargeImageViewController.create(image: image, description: description, sourceView: originView, sourceViewController: self)
        vc.delegate = self
        return vc
    }
    
    func showLargeImage(_ image: UIImage, description: String?, animatingFrom originView: UIView) {
        let vc = viewController(forImage: image, description: description, animatingFrom: originView)
        present(vc, animated: true)
    }
    
    func showMoreOptions(forStatus statusID: String) {
        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: "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))
        present(alert, animated: true)
    }
    
}