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

import UIKit
import MastodonKit
import SafariServices

class ProfileTableViewController: UITableViewController {

    static func create(for account: Account) -> UIViewController {
        guard let profileController = UIStoryboard(name: "Profile", bundle: nil).instantiateInitialViewController() as? ProfileTableViewController else { fatalError() }
        profileController.account = account
        return profileController
    }
    
    var account: Account!
    
    var statuses: [Status] = [] {
        didSet {
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
        }
    }
    
    var newer: RequestRange?
    var older: RequestRange?
    
    func request(for range: RequestRange? = .default) -> Request<[Status]> {
        let range = range ?? .default
        return Accounts.statuses(id: account.id, mediaOnly: false, pinnedOnly: false, excludeReplies: true, range: range)
    }
    
    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")
        
        navigationItem.title = account.displayName
        
        MastodonController.shared.client.run(request()) { result in
            guard case let .success(statuses, pagination) = result else { fatalError() }
            self.statuses = statuses
            self.newer = pagination?.previous
            self.older = pagination?.next
        }
    }
    
    /*
     // 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 statuses.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: account)
            cell.delegate = self
            return cell
        case 1:
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "statusCell", for: indexPath) as? StatusTableViewCell else { fatalError() }
            let status = statuses[indexPath.row]
            cell.updateUI(for: status)
            cell.delegate = self
            return cell
        default:
            fatalError("Invalid section \(indexPath.section) for profile VC")
        }
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        guard indexPath.section == 1 else { return }
        guard let cell = tableView.cellForRow(at: indexPath) as? StatusTableViewCell else { fatalError() }
        cell.didSelect()
    }
    
    override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        if indexPath.section == 1 && indexPath.row == statuses.count - 1 {
            guard let older = older else { return }
            
            MastodonController.shared.client.run(request(for: older)) { result in
                guard case let .success(newStatuses, pagination) = result else { fatalError() }
                self.older = pagination?.next
                self.statuses.append(contentsOf: newStatuses)
            }
        }
    }

    @IBAction func refreshStatuses(_ sender: Any) {
        guard let newer = newer else { return }
        
        MastodonController.shared.client.run(request(for: newer)) { result in
            guard case let .success(newStatuses, pagination) = result else { fatalError() }
            self.newer = pagination?.previous
            self.statuses.insert(contentsOf: newStatuses, at: 0)
            DispatchQueue.main.async {
                self.refreshControl?.endRefreshing()
            }
        }
    }
}

extension ProfileTableViewController: ProfileHeaderTableViewCellDelegate {
    
}