//
//  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 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: UIView) -> LargeImageViewController
    
    func largeImage(gifData: Data, description: String?, sourceView: UIView) -> LargeImageViewController
    
    func showLargeImage(_ image: UIImage, description: String?, animatingFrom sourceView: UIView)
    
    func showLargeImage(gifData: Data, description: String?, animatingFrom sourceView: UIView)
    
    func gallery(attachments: [Attachment], sourceViews: [UIView], startIndex: Int) -> GalleryViewController
    
    func showGallery(attachments: [Attachment], sourceViews: [UIView], startIndex: Int)
    
    func showMoreOptions(forStatus statusID: String)
    
    func showMoreOptions(forURL url: URL)
}

extension TuskerNavigationDelegate where Self: UIViewController {
    
    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: UIView) -> (CGRect, CGFloat) {
        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 (sourceFrame, sourceView.layer.cornerRadius)
    }
    
    func largeImage(_ image: UIImage, description: String?, sourceView: UIView) -> LargeImageViewController {
        let (sourceFrame, sourceCornerRadius) = sourceViewInfo(sourceView)
        let vc = LargeImageViewController(image: image, description: description, sourceFrame: sourceFrame, sourceCornerRadius: sourceCornerRadius)
        vc.transitioningDelegate = self
        return vc
    }
    
    func largeImage(gifData: Data, description: String?, sourceView: UIView) -> LargeImageViewController {
        let (sourceFrame, sourceCornerRadius) = sourceViewInfo(sourceView)
        let vc = LargeImageViewController(image: UIImage(data: gifData)!, description: description, sourceFrame: sourceFrame, sourceCornerRadius: sourceCornerRadius)
        vc.transitioningDelegate = self
        vc.gifData = gifData
        return vc
    }
    
    func showLargeImage(_ image: UIImage, description: String?, animatingFrom sourceView: UIView) {
        present(largeImage(image, description: description, sourceView: sourceView), animated: true)
    }
    
    func showLargeImage(gifData: Data, description: String?, animatingFrom sourceView: UIView) {
        present(largeImage(gifData: gifData, description: description, sourceView: sourceView), animated: true)
    }
    
    func gallery(attachments: [Attachment], sourceViews: [UIView], 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: [UIView], startIndex: Int) {
        present(gallery(attachments: attachments, sourceViews: sourceViews, startIndex: startIndex), animated: true)
    }
    
    private func moreOptions(forURL url: URL) -> UIAlertController {
        let alert = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        alert.title = url.absoluteString
        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
    }
    
    private func moreOptions(forStatus statusID: String) -> UIAlertController {
        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)
    }
    
}