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

import UIKit
import SafariServices
import Pachyderm

protocol TuskerNavigationDelegate {
    
    var apiController: MastodonController { get }
    
    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 selected(status statusID: String, state: StatusState)
    
    func compose()
    
    func compose(mentioning: String?)
    
    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(forAccount accountID: String)
    
    func showMoreOptions(forURL url: URL)
    
    func showFollowedByList(accountIDs: [String])
    
    func statusActionAccountList(action: StatusActionAccountListTableViewController.ActionType, statusID: String, statusState state: StatusState, 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, mastodonController: apiController), sender: self)
    }
    
    func selected(mention: Mention) {
        show(ProfileTableViewController(accountID: mention.id, mastodonController: apiController), sender: self)
    }
    
    func selected(tag: Hashtag) {
        show(HashtagTimelineViewController(for: tag, mastodonController: apiController), sender: self)
    }
    
    func selected(url: URL) {
        func openSafari() {
            if Preferences.shared.useInAppSafari {
                let config = SFSafariViewController.Configuration()
                config.entersReaderIfAvailable = Preferences.shared.inAppSafariAutomaticReaderMode
                present(SFSafariViewController(url: url, configuration: config), animated: true)
            } else {
                UIApplication.shared.open(url, options: [:])
            }
        }
        
        if (Preferences.shared.openLinksInApps) {
            UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { (success) in
                if (!success) {
                    openSafari()
                }
            }
        } else {
            openSafari()
        }
    }
    
    func selected(status statusID: String) {
        self.selected(status: statusID, state: .unknown)
    }
    
    func selected(status statusID: String, state: StatusState) {
        // todo: is this necessary? should the conversation main status cell prevent this
        // 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, state: state, mastodonController: apiController), sender: self)
    }
    
    // protocols can't have parameter defaults, so this stub is necessary to fulfill the protocol req
    func compose() {
        compose(mentioning: nil)
    }
    
    func compose(mentioning: String? = nil) {
        let compose = ComposeViewController(mentioningAcct: mentioning, mastodonController: apiController)
        let vc = UINavigationController(rootViewController: compose)
        vc.presentationController?.delegate = compose
        present(vc, animated: true)
    }
    
    func reply(to statusID: String) {
        let compose = ComposeViewController(inReplyTo: statusID, mastodonController: apiController)
        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 = apiController.cache.status(for: statusID) else { fatalError("Missing cached status \(statusID)") }
        guard let url = status.url else { fatalError("Missing url for status \(statusID)") }
        var customActivites: [UIActivity] = [OpenInSafariActivity()]

        if let bookmarked = status.bookmarked {
            customActivites.insert(bookmarked ? UnbookmarkStatusActivity() : BookmarkStatusActivity(), at: 0)
        }
        
        if status.account == apiController.account,
            let pinned = status.pinned {
            customActivites.insert(pinned ? UnpinStatusActivity() : PinStatusActivity(), at: 1)
        }
        
        let activityController = UIActivityViewController(activityItems: [url, status], applicationActivities: customActivites)
        activityController.completionWithItemsHandler = OpenInSafariActivity.completionHandler(viewController: self, url: url)
        return activityController
    }
    
    private func moreOptions(forAccount accountID: String) -> UIViewController {
        guard let account = apiController.cache.account(for: accountID) else { fatalError("Missing cached account \(accountID)") }
        return moreOptions(forURL: account.url)
    }
    
    func showMoreOptions(forStatus statusID: String) {
        present(moreOptions(forStatus: statusID), animated: true)
    }
    
    func showMoreOptions(forURL url: URL) {
        present(moreOptions(forURL: url), animated: true)
    }
    
    func showMoreOptions(forAccount accountID: String) {
        present(moreOptions(forAccount: accountID), animated: true)
    }
    
    func showFollowedByList(accountIDs: [String]) {
        let vc = AccountListTableViewController(accountIDs: accountIDs, mastodonController: apiController)
        vc.title = NSLocalizedString("Followed By", comment: "followed by accounts list title")
        show(vc, sender: self)
    }
    
    func statusActionAccountList(action: StatusActionAccountListTableViewController.ActionType, statusID: String, statusState state: StatusState, accountIDs: [String]?) -> StatusActionAccountListTableViewController {
        return StatusActionAccountListTableViewController(actionType: action, statusID: statusID, statusState: state, accountIDs: accountIDs, mastodonController: apiController)
    }
    
}