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

import UIKit
import SafariServices
import Pachyderm

protocol TuskerNavigationDelegate: class {
    
    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 reply(to statusID: String, mentioningAcct: String?)
    
    func loadingLargeImage(url: URL, cache: ImageCache, description: String?, animatingFrom sourceView: UIImageView) -> LoadingLargeImageViewController
    
    func showLoadingLargeImage(url: URL, cache: ImageCache, 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, sourceView: UIView?)
    
    func showMoreOptions(forAccount accountID: String, sourceView: UIView?)
    
    func showMoreOptions(forURL url: URL, sourceView: UIView?)
    
    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) {
        if vc is LargeImageViewController || vc is GalleryViewController || vc is SFSafariViewController {
            present(vc, animated: true)
        } else {
            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?) {
        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) {
        reply(to: statusID, mentioningAcct: nil)
    }
    
    func reply(to statusID: String, mentioningAcct: String?) {
        let compose = ComposeViewController(inReplyTo: statusID, mentioningAcct: mentioningAcct, mastodonController: apiController)
        let vc = UINavigationController(rootViewController: compose)
        vc.presentationController?.delegate = compose
        present(vc, animated: true)
    }
    
    func loadingLargeImage(url: URL, cache: ImageCache, description: String?, animatingFrom sourceView: UIImageView) -> LoadingLargeImageViewController {
        let vc = LoadingLargeImageViewController(url: url, cache: cache, imageDescription: description)
        vc.animationSourceView = sourceView
        vc.transitioningDelegate = self
        return vc
    }
    
    func showLoadingLargeImage(url: URL, cache: ImageCache, description: String?, animatingFrom sourceView: UIImageView) {
        present(loadingLargeImage(url: url, cache: cache, description: description, animatingFrom: sourceView), animated: true)
    }
    
    func gallery(attachments: [Attachment], sourceViews: [UIImageView?], startIndex: Int) -> GalleryViewController {
        let vc = GalleryViewController(attachments: attachments, sourceViews: sourceViews, 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) -> UIActivityViewController {
        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) -> UIActivityViewController {
        guard let status = apiController.persistentContainer.status(for: statusID) else { fatalError("Missing cached status \(statusID)") }
        guard let url = status.url else { fatalError("Missing url for status \(statusID)") }
        
        // on iOS 14+, all these custom actions are in the context menu and don't need to be in the share sheet
        if #available(iOS 14.0, *) {
            return UIActivityViewController(activityItems: [url, StatusActivityItemSource(status)], applicationActivities: nil)
        } else {
            var customActivites: [UIActivity] = [
                OpenInSafariActivity(),
                (status.bookmarked ?? false) ? UnbookmarkStatusActivity() : BookmarkStatusActivity(),
                status.muted ? UnmuteConversationActivity() : MuteConversationActivity(),
            ]

            if apiController.account != nil, status.account.id == apiController.account.id {
                let pinned = status.pinned ?? false
                customActivites.insert(pinned ? UnpinStatusActivity() : PinStatusActivity(), at: 1)
            }

            let activityController = UIActivityViewController(activityItems: [url, StatusActivityItemSource(status)], applicationActivities: customActivites)
            activityController.completionWithItemsHandler = OpenInSafariActivity.completionHandler(viewController: self, url: url)
            return activityController
        }
    }
    
    private func moreOptions(forAccount accountID: String) -> UIActivityViewController {
        guard let account = apiController.persistentContainer.account(for: accountID) else { fatalError("Missing cached account \(accountID)") }
        
        if #available(iOS 14.0, *) {
            return UIActivityViewController(activityItems: [account.url, AccountActivityItemSource(account)], applicationActivities: nil)
        } else {
            let customActivities: [UIActivity] = [
                OpenInSafariActivity(),
            ]

            let activityController = UIActivityViewController(activityItems: [account.url, AccountActivityItemSource(account)], applicationActivities: customActivities)
            activityController.completionWithItemsHandler = OpenInSafariActivity.completionHandler(viewController: self, url: account.url)
            return activityController
        }
    }
    
    func showMoreOptions(forStatus statusID: String, sourceView: UIView?) {
        let vc = moreOptions(forStatus: statusID)
        vc.popoverPresentationController?.sourceView = sourceView
        present(vc, animated: true)
    }
    
    func showMoreOptions(forURL url: URL, sourceView: UIView?) {
        let vc = moreOptions(forURL: url)
        vc.popoverPresentationController?.sourceView = sourceView
        present(vc, animated: true)
    }
    
    func showMoreOptions(forAccount accountID: String, sourceView: UIView?) {
        let vc = moreOptions(forAccount: accountID)
        vc.popoverPresentationController?.sourceView = sourceView
        present(vc, 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)
    }
    
}