//
//  XCBActions.swift
//  Tusker
//
//  Created by Shadowfacts on 9/23/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import Pachyderm

struct XCBActions {
    
    // MARK: - Utils
    static func presentModally(_ vc: UIViewController, animated: Bool, completion: (() -> Void)? = nil) {
        UIApplication.shared.keyWindow!.rootViewController!.present(vc, animated: animated, completion: completion)
    }
    
    static func presentNav(_ vc: UIViewController, animated: Bool) {
        let tabBarController = UIApplication.shared.keyWindow!.rootViewController! as! UITabBarController
        let navController = tabBarController.selectedViewController as! UINavigationController
        navController.pushViewController(vc, animated: animated)
    }
    
    // MARK: - Statuses
    static func postStatus(_ url: XCallbackURL, _ session: XCBSession, _ silent: Bool?) {
        let mentioning = url.arguments["mentioning"]
        let text = url.arguments["text"]
        
        if silent ?? false {
            var status = ""
            if let mentioning = mentioning { status += mentioning }
            if let text = text { status += text }
            let request = MastodonController.shared.client.createStatus(text: status, visibility: Preferences.shared.defaultPostVisibility)
            MastodonController.shared.client.run(request) { response in
                if case let .success(status, _) = response {
                    session.complete(with: .success, additionalData: [
                        "statusURL": status.url?.absoluteString,
                        "statusURI": status.uri
                        ])
                } else if case let .failure(error) = response {
                    session.complete(with: .error, additionalData: [
                        "error": error.localizedDescription
                        ])
                }
            }
        } else {
            let vc = ComposeViewController.create(for: session, mentioning: mentioning, text: text)
            presentModally(vc, animated: true)
        }
    }
    
    static func favoriteStatus(_ url: XCallbackURL, _ session: XCBSession, _ silent: Bool?) {
        func performAction(status: Status, completion: ((Status) -> Void)?) {
            let request = Status.favourite(status)
            MastodonController.shared.client.run(request) { (response) in
                if case let .success(status, _) = response {
                    MastodonCache.add(status: status)
                    completion?(status)
                    session.complete(with: .success, additionalData: [
                        "statusURL": status.url?.absoluteString,
                        "statusURI": status.uri
                        ])
                } else if case let .failure(error) = response {
                    session.complete(with: .error, additionalData: [
                        "error": error.localizedDescription
                        ])
                }
            }
        }
        
        func favorite(_ status: Status) {
            if silent ?? false {
                performAction(status: status, completion: nil)
            } else {
                let vc = ConversationViewController.create(for: status.id)
                DispatchQueue.main.async {
                    presentNav(vc, animated: true)
                }
                let alertController = UIAlertController(title: "Favorite status?", message: nil, preferredStyle: .alert)
                alertController.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (_) in
                    performAction(status: status, completion: { (status) in
                        DispatchQueue.main.async {
                            vc.tableView.reloadData()
                        }
                    })
                }))
                alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (_) in
                    session.complete(with: .cancel)
                }))
                DispatchQueue.main.async {
                    presentModally(alertController, animated: true)
                }
            }
        }
        
        if let id = url.arguments["statusID"] {
            MastodonCache.status(for: id) { (status) in
                if let status = status {
                    favorite(status)
                }
            }
        } else if let searchQuery = url.arguments["statusURL"] ?? url.arguments["statusURI"] {
            let request = MastodonController.shared.client.search(query: searchQuery)
            MastodonController.shared.client.run(request) { (response) in
                if case let .success(results, _) = response,
                    let status = results.statuses.first {
                    favorite(status)
                } else {
                    session.complete(with: .error, additionalData: [
                        "error": "Could not find status by searching '\(searchQuery)'"
                        ])
                }
            }
        } else {
            session.complete(with: .error, additionalData: [
                "error": "No status provided. Specify either instance-local statusID or remote statusURL/statusURI"
                ])
        }
    }
    
    // MARK: - Accounts
    static func getCurrentUser(_ url: XCallbackURL, _ session: XCBSession, _ silent: Bool?) {
        let account = MastodonController.shared.account!
        session.complete(with: .success, additionalData: [
            "username": account.acct,
            "displayName": account.displayName,
            "locked": account.locked.description,
            "followers": account.followersCount.description,
            "following": account.followingCount.description,
            "url": account.url.absoluteString,
            "avatarURL": account.avatar.absoluteString,
            "headerURL": account.header.absoluteString,
            ])
    }
}