//
//  SearchTableViewController.swift
//  elpha-ios
//
//  Created by Dwayne Harris on 11/30/18.
//  Copyright © 2018 Elpha. All rights reserved.
//

import Kingfisher
import UIKit

class SearchTableViewController: UITableViewController {
    @IBOutlet var searchBar: UISearchBar!
    @IBOutlet var searchSegmentedControl: UISegmentedControl!
    @IBOutlet var noResultsView: UIView!
    
    var accounts: [AccountMO]?
    var hashtags: [TagMO]?
    var statuses: [StatusMO]?
    
    func clearResults() {
        self.accounts = []
        self.hashtags = []
        self.accounts = []
        
        tableView.reloadData()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.backgroundView = noResultsView
        searchBar.delegate = self
    }
    
    @IBAction func searchSegmentedControlTapped(_ sender: Any) {
        tableView.reloadData()
        
        if tableView.numberOfRows(inSection: 0) == 0 {
            tableView.backgroundView = noResultsView
        } else {
            tableView.backgroundView = nil
        }
    }
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        switch searchSegmentedControl.selectedSegmentIndex {
        case 0: return accounts?.count ?? 0
        case 1: return hashtags?.count ?? 0
        case 2: return statuses?.count ?? 0
        default: return 0
        }
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        switch searchSegmentedControl.selectedSegmentIndex {
        case 0:
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "AccountSearchTableViewCell", for: indexPath) as? AccountSearchTableViewCell else {
                fatalError("Unable to find reusable cell")
            }
            
            if let account = self.accounts?[indexPath.row] {
                cell.avatarImageView.setRoundedCorners()
                cell.avatarImageView.kf.setImage(with: account.avatarURL)
                cell.displayNameLabel.text = account.displayName
                cell.usernameLabel.text = "@\(account.acct!)"
            }
            
            return cell
        case 1:
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "HashtagSearchTableViewCell", for: indexPath) as? HashtagSearchTableViewCell else {
                fatalError("Unable to find reusable cell")
            }
            
            if let hashtag = self.hashtags?[indexPath.row] {
                cell.hashtagLabel.text = "#\(hashtag.name!)"
            }
            
            return cell
        case 2:
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "StatusSearchTableViewCell", for: indexPath) as? StatusSearchTableViewCell else {
                fatalError("Unable to find reusable cell")
            }
            
            if let status = self.statuses?[indexPath.row] {
                cell.statusView.update(withStatus: status)
            }
            
            return cell
        default:
            fatalError("")
        }
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        switch searchSegmentedControl.selectedSegmentIndex {
        case 0:
            if let account = self.accounts?[indexPath.row] {
                if let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "AccountTableViewController") as? AccountTableViewController {
                    controller.account = account
                    self.navigationController?.pushViewController(controller, animated: true)
                }
            }
        default:
            return
        }
    }
}

extension SearchTableViewController: UISearchBarDelegate {
    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        if let search = searchBar.text, !search.isEmpty {
            searchBar.resignFirstResponder()
            
            MastodonAPI.search(content: search) { data, error in
                guard let data = data, error == nil else {
                    return
                }
                
                if let accounts = data["accounts"] as? JSONObjectArray {
                    self.accounts = accounts.compactMap { MastodonDataManager.upsertAccount($0) }
                }
                
                if let hashtags = data["hashtags"] as? JSONObjectArray {
                    self.hashtags = hashtags.compactMap { MastodonDataManager.upsertTag($0) }
                }
                
                if let statuses = data["statuses"] as? JSONObjectArray {
                    self.statuses = statuses.compactMap { MastodonDataManager.upsertStatus($0) }.map { $0.object }
                }
                
                self.tableView.reloadData()
            }
        } else {
            clearResults()
            searchBar.resignFirstResponder()
        }
    }
    
    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        clearResults()
    }
}