//
//  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 show(_ vc: UIViewController)
    
    func selected(account accountID: String)
    
    func selected(mention: Mention)
    
    func selected(tag: Hashtag)
    
    func selected(url: URL)
    
    func selected(status statusID: String)
    
    func compose()
    
    func reply(to statusID: String)
    
    func largeImage(_ image: UIImage, description: String?, sourceView: UIImageView) -> LargeImageViewController
    
    func largeImage(gifData: Data, description: String?, sourceView: UIImageView) -> LargeImageViewController
    
    func showLargeImage(_ image: UIImage, description: String?, animatingFrom sourceView: UIImageView)
    
    func showLargeImage(gifData: Data, description: String?, animatingFrom sourceView: UIImageView)
    
    func gallery(attachments: [Attachment], sourceViews: [UIImageView?], startIndex: Int) -> GalleryViewController
    
    func showGallery(attachments: [Attachment], sourceViews: [UIImageView?], startIndex: Int)
    
    func showMoreOptions(forStatus statusID: String)
    
    func showMoreOptions(forURL url: URL)
    
    func showFollowedByList(accountIDs: [String])
    
    func statusActionAccountList(action: StatusActionAccountListTableViewController.ActionType, statusID: String, accountIDs: [String]?) -> StatusActionAccountListTableViewController
}

extension TuskerNavigationDelegate where Self: UIViewController {
    
    func show(_ vc: UIViewController) {
        show(vc, sender: self)
    }
    
    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
        }
        
        show(ProfileTableViewController(accountID: accountID), sender: self)
    }
    
    func selected(mention: Mention) {
        show(ProfileTableViewController(accountID: mention.id), sender: self)
    }
    
    func selected(tag: Hashtag) {
        show(TimelineTableViewController(for: .tag(hashtag: tag.name)), sender: self)
    }
    
    func selected(url: URL) {
        if (Preferences.shared.openLinksInApps) {
            UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { (success) in
                if (!success) {
                    self.present(SFSafariViewController(url: url), animated: true)
                }
            }
        } else {
            present(SFSafariViewController(url: url), animated: true)
        }
    }
    
    func selected(status statusID: String) {
        // don't open if the conversation is the same as the current one
        if let conversationController = self as? ConversationTableViewController,
            conversationController.mainStatusID == statusID {
            return
        }
        
        show(ConversationTableViewController(for: statusID), sender: self)
    }
    
    func compose() {
        let compose = ComposeViewController()
        let vc = UINavigationController(rootViewController: compose)
        vc.presentationController?.delegate = compose
        present(vc, animated: true)
    }
    
    func reply(to statusID: String) {
        let compose = ComposeViewController(inReplyTo: statusID)
        let vc = UINavigationController(rootViewController: compose)
        vc.presentationController?.delegate = compose
        present(vc, animated: true)
    }
    
    private func sourceViewInfo(_ sourceView: UIImageView?) -> LargeImageViewController.SourceInfo? {
        guard let sourceView = sourceView else { return nil }
        
        var sourceFrame = sourceView.convert(sourceView.bounds, to: view)
        if let scrollView = view as? UIScrollView {
            let scale = scrollView.zoomScale
            let width = sourceFrame.width * scale
            let height = sourceFrame.height * scale
            let x = sourceFrame.minX * scale - scrollView.contentOffset.x + scrollView.frame.minX
            let y = sourceFrame.minY * scale - scrollView.contentOffset.y + scrollView.frame.minY
            sourceFrame = CGRect(x: x, y: y, width: width, height: height)
        }
        return (image: sourceView.image!, frame: sourceFrame, cornerRadius: sourceView.layer.cornerRadius)
    }
    
    func largeImage(_ image: UIImage, description: String?, sourceView: UIImageView) -> LargeImageViewController {
        let vc = LargeImageViewController(image: image, description: description, sourceInfo: sourceViewInfo(sourceView))
        vc.transitioningDelegate = self
        return vc
    }
    
    func largeImage(gifData: Data, description: String?, sourceView: UIImageView) -> LargeImageViewController {
        let vc = LargeImageViewController(image: UIImage(data: gifData)!, description: description, sourceInfo: sourceViewInfo(sourceView))
        vc.transitioningDelegate = self
        vc.gifData = gifData
        return vc
    }
    
    func showLargeImage(_ image: UIImage, description: String?, animatingFrom sourceView: UIImageView) {
        present(largeImage(image, description: description, sourceView: sourceView), animated: true)
    }
    
    func showLargeImage(gifData: Data, description: String?, animatingFrom sourceView: UIImageView) {
        present(largeImage(gifData: gifData, description: description, sourceView: sourceView), animated: true)
    }
    
    func gallery(attachments: [Attachment], sourceViews: [UIImageView?], startIndex: Int) -> GalleryViewController {
        let sourcesInfo = sourceViews.map(sourceViewInfo)
        let vc = GalleryViewController(attachments: attachments, sourcesInfo: sourcesInfo, startIndex: startIndex)
        vc.transitioningDelegate = self
        return vc
    }
    
    func showGallery(attachments: [Attachment], sourceViews: [UIImageView?], startIndex: Int) {
        present(gallery(attachments: attachments, sourceViews: sourceViews, startIndex: startIndex), animated: true)
    }
    
    private func moreOptions(forURL url: URL) -> UIViewController {
        let customActivites: [UIActivity] = [
            OpenInSafariActivity()
        ]
        let activityController = UIActivityViewController(activityItems: [url], applicationActivities: customActivites)
        activityController.completionWithItemsHandler = OpenInSafariActivity.completionHandler(viewController: self, url: url)
        return activityController
    }
    
    private func moreOptions(forStatus statusID: String) -> UIViewController {
        guard let status = MastodonCache.status(for: statusID) else { fatalError("Missing cached status \(statusID)") }
        guard let url = status.url else { fatalError("Missing url for status \(statusID)") }
        return moreOptions(forURL: url)
    }
    
    func showMoreOptions(forStatus statusID: String) {
        present(moreOptions(forStatus: statusID), animated: true)
    }
    
    func showMoreOptions(forURL url: URL) {
        present(moreOptions(forURL: url), animated: true)
    }
    
    func showFollowedByList(accountIDs: [String]) {
        let vc = AccountListTableViewController(accountIDs: accountIDs)
        vc.title = NSLocalizedString("Followed By", comment: "followed by accounts list title")
        show(vc, sender: self)
    }
    
    func statusActionAccountList(action: StatusActionAccountListTableViewController.ActionType, statusID: String, accountIDs: [String]?) -> StatusActionAccountListTableViewController {
        return StatusActionAccountListTableViewController(actionType: action, statusID: statusID, accountIDs: accountIDs)
    }
    
}