Tusker/Tusker/Screens/Profile/ProfileTableViewController.swift

//
//  ProfileTableViewController.swift
//  Tusker
//
//  Created by Shadowfacts on 8/27/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import Pachyderm
import SafariServices

class ProfileTableViewController: UITableViewController, PreferencesAdaptive {

    static func create(for accountID: String) -> UIViewController {
        guard let profileController = UIStoryboard(name: "Profile", bundle: nil).instantiateInitialViewController() as? ProfileTableViewController else { fatalError() }
        profileController.accountID = accountID
        return profileController
    }
    
    var accountID: String!
    
    var statusIDs: [String] = [] {
        didSet {
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
        }
    }
    
    var older: RequestRange?
    var newer: RequestRange?
    
    func getStatuses(for range: RequestRange = .default, completion: @escaping Client.Callback<[Status]>) {
        let request = Account.getStatuses(accountID, range: range, onlyMedia: false, pinned: false, excludeReplies: !Preferences.shared.showRepliesInProfiles)
        MastodonController.shared.client.run(request, completion: completion)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.rowHeight = UITableView.automaticDimension
        tableView.estimatedRowHeight = 140
        
        tableView.register(UINib(nibName: "StatusTableViewCell", bundle: nil), forCellReuseIdentifier: "statusCell")
        tableView.register(UINib(nibName: "ProfileHeaderTableViewCell", bundle: nil), forCellReuseIdentifier: "headerCell")
        
        updateUIForPreferences()
        
        getStatuses { response in
            guard case let .success(statuses, pagination) = response else { fatalError() }
            MastodonCache.addAll(statuses: statuses)
            self.statusIDs = statuses.map { $0.id }
            self.older = pagination?.older
            self.newer = pagination?.newer
        }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        for cell in tableView.visibleCells {
            if let cell = cell as? PreferencesAdaptive {
                cell.updateUIForPreferences()
            }
        }
        updateUIForPreferences()
    }
    
    func updateUIForPreferences() {
        guard let account = MastodonCache.account(for: accountID) else { fatalError("Missing cached account \(accountID!)") }
        navigationItem.title = account.realDisplayName
    }
    
    func sendMessageMentioning() {
        guard let account = MastodonCache.account(for: accountID) else { fatalError("Missing cached account \(accountID!)") }
        let vc = ComposeViewController.create(mentioning: account.acct)
        present(vc, animated: true)
    }
    
    /*
     // MARK: - Navigation
     
     // In a storyboard-based application, you will often want to do a little preparation before navigation
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
     // Get the new view controller using segue.destination.
     // Pass the selected object to the new view controller.
     }
     */
    
    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 2
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        switch section {
        case 0:
            return 1
        case 1:
            return statusIDs.count
        default:
            return 0
        }
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        switch indexPath.section {
        case 0:
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "headerCell", for: indexPath) as? ProfileHeaderTableViewCell else { fatalError() }
            cell.selectionStyle = .none
            cell.updateUI(for: accountID)
            cell.delegate = self
            return cell
        case 1:
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as? StatusTableViewCell else { fatalError() }
            let statusID = statusIDs[indexPath.row]
            cell.updateUI(for: statusID)
            cell.delegate = self
            return cell
        default:
            fatalError("Invalid section \(indexPath.section) for profile VC")
        }
    }
    
    override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        if indexPath.section == 1 && indexPath.row == statusIDs.count - 1 {
            guard let older = older else { return }
            
            getStatuses(for: older) { response in
                guard case let .success(newStatuses, pagination) = response else { fatalError() }
                self.older = pagination?.older
                MastodonCache.addAll(statuses: newStatuses)
                self.statusIDs.append(contentsOf: newStatuses.map { $0.id })
            }
        }
    }

    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return tableView.cellForRow(at: indexPath) is TableViewSwipeActionProvider
    }
    
    override func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.leadingSwipeActionsConfiguration()
    }
    
    override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        return (tableView.cellForRow(at: indexPath) as? TableViewSwipeActionProvider)?.trailingSwipeActionsConfiguration()
    }
    
    @IBAction func refreshStatuses(_ sender: Any) {
        guard let newer = newer else { return }
        
        getStatuses(for: newer) { response in
            guard case let .success(newStatuses, pagination) = response else { fatalError() }
            self.newer = pagination?.newer
            MastodonCache.addAll(statuses: newStatuses)
            self.statusIDs.insert(contentsOf: newStatuses.map { $0.id }, at: 0)
            DispatchQueue.main.async {
                self.refreshControl?.endRefreshing()
            }
        }
    }
    
    @IBAction func composePressed(_ sender: Any) {
        sendMessageMentioning()
    }
    
}

extension ProfileTableViewController: ProfileHeaderTableViewCellDelegate {
    
    func showMoreOptions() {
        let account = MastodonCache.account(for: accountID)!
        
        let alert = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        alert.addAction(UIAlertAction(title: "Open in Safari...", style: .default, handler: { _ in
            let vc = SFSafariViewController(url: account.url)
            self.present(vc, animated: true)
        }))
        alert.addAction(UIAlertAction(title: "Share...", style: .default, handler: { _ in
            let vc = UIActivityViewController(activityItems: [account.url], applicationActivities: nil)
            self.present(vc, animated: true)
        }))
        alert.addAction(UIAlertAction(title: "Send Message...", style: .default, handler: { _ in
            self.sendMessageMentioning()
        }))
        alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))

        MastodonCache.relationship(for: account.id) { (relationship) in
            guard let relationship = relationship else {
                DispatchQueue.main.async {
                    self.present(alert, animated: true)
                }
                return
            }
            let title = relationship.following ? "Unfollow": "Follow"
            DispatchQueue.main.async {
                alert.addAction(UIAlertAction(title: title, style: .default, handler: { (_) in
                    UIImpactFeedbackGenerator(style: .medium).impactOccurred()
                    let request = (relationship.following ? Account.unfollow : Account.follow)(account.id)
                    MastodonController.shared.client.run(request, completion: { (response) in
                        if case let .success(relationship, _) = response {
                            MastodonCache.add(relationship: relationship)
                        } else {
                            // todo: display error message
                            UINotificationFeedbackGenerator().notificationOccurred(.error)
                            fatalError()
                        }
                    })
                }))
                self.present(alert, animated: true)
            }
        }
    }
    
}

extension ProfileTableViewController: LargeImageViewControllerDelegate {}