LONDON-IOS/GMERemittance/Module/TransactionHistory/User Interface/View/TransactionHistoryViewController.swift

//
//  TransactionHistoryViewController.swift
//  GMERemittance
//
//  Created by gme_2 on 28/09/2018.
//Copyright © 2018 Gobal Money Express Co. Ltd. All rights reserved.
//

import UIKit

enum TransactionModelType: String {
    case paid = "Paid"
    case all = "all"
    case received = "received"
}

class TransactionHistoryViewController: UIViewController {
    
    enum SegmentIndex: Int {
        case all = 0
        case sent
        case delivered
    }
    
    struct Constant {
        static let heightOfDateRangeLabel: CGFloat = 35
    }

    @IBOutlet weak var fromDateLabel: UILabel!
    @IBOutlet weak var toDateLabel: UILabel!

    
    // MARK: IBOutlets
    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var segmentedControl: UISegmentedControl!
    @IBOutlet weak var dateRangeLabelHeightConstraint: NSLayoutConstraint!
    @IBOutlet weak var emptyLabel: UILabel!
    
    @IBOutlet weak var searchTextField: UITextField!
    
    
    // MARK: Properties
    
    var from: String?
    var to: String?
    
    var transactions: [TransactionModel] = [] {
        didSet {
            self.emptyLabel.isHidden = !transactions.isEmpty
            self.tableView.reloadData()
            guard let fromDate = from, let toDate = to else {
                self.dateRangeLabelHeightConstraint.constant = 0
                return
            }
            self.fromDateLabel.text = self.getHUmanReadableDate(date: fromDate)
            self.toDateLabel.text = self.getHUmanReadableDate(date: toDate)
            UIView.animate(withDuration: 0.33, animations: {
                self.dateRangeLabelHeightConstraint.constant = Constant.heightOfDateRangeLabel
            })
        }
    }
    
    var transactionType: TransactionModelType? {
        didSet {
            // filter for transaction type
            if self.transactionType != oldValue {
                guard let type = self.transactionType else {return}
                self.presenter?.filterTransaction(type: type)
            }
        }
    }
    var presenter: TransactionHistoryModuleInterface?
    

    // MARK: VC's Life cycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.setupNormalNavigation()
        self.setup()
        presenter?.viewIsReady()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationItem.title = "Transaction Report"
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationItem.title = ""
    }
    
    // MARK: IBActions
    @IBAction func openSearchFilter(_ sender: UIButton) {
        // open search filter
        let viewController = UIStoryboard.init(name: "TransactionHistoryDatePicker", bundle: nil).instantiateViewController(withIdentifier: "DatePickerViewController")  as! DatePickerViewController
        viewController.completion = self.selectedDate
        self.present(viewController, animated: true, completion: nil)
    }
    
    @IBAction func segmentChanged(_ sender: UISegmentedControl) {
        self.searchTextField.text = ""
        guard let index = SegmentIndex(rawValue: sender.selectedSegmentIndex) else {return}
        switch index {
        case .all:
            self.transactionType = .all
        case .sent:
            self.transactionType = .received
        case .delivered:
            self.transactionType = .paid
        }
    }
    
    
    // MARK: Other Functions
    
    private func selectedDate(from: String?, to: String?) {
        self.from = from
        self.to = to
        guard let fromDate = from, let toDate = to else {return}
        self.presenter?.fetchTransactionHistories(fromDate: fromDate, toDate: toDate)
    }
    
    private func getHUmanReadableDate(date: String?) -> String? {
        if let date = DateFormatter.toDate(dateString: date ?? "", format: AppConstants.dateFormat) {
            let dateString = DateFormatter.toString(date: date, format: AppConstants.humanReadableDateFormat)
            return dateString
        }
        return nil
    }
    
    private func setup() {
        // all setup should be done here
       setupSearchTextField()
       setupDelegates()
        self.transactionType = .all
        self.dateRangeLabelHeightConstraint.constant = 0
    }
    
    private func setupSearchTextField() {
        let imageview = UIImageView(image: #imageLiteral(resourceName: "ic_search"))
        self.searchTextField.leftView = imageview
        self.searchTextField.leftViewMode = .always
        self.searchTextField.addTarget(self, action: #selector(search(sender:)), for: UIControlEvents.editingChanged)
    }
    
    @objc func search(sender: UITextField) {
        let searchText = sender.text!
        self.presenter?.search(text: searchText)
    }
    
    private func setupDelegates() {
        self.tableView.delegate = self
        self.tableView.dataSource = self
    }
    
    
}

// MARK: TransactionHistoryViewInterface
extension TransactionHistoryViewController: TransactionHistoryViewInterface {
    func showLoading() {
        self.showProgressHud()
    }
    
    func hideLoading() {
        self.hideProgressHud()
    }
    
    func show(error: String) {
        self.alert(message: error)
    }
    
    func show(models: [TransactionModel]) {
        self.transactions = models
    }
}

// MARK: TableViewDelegate
extension TransactionHistoryViewController: UITableViewDelegate {
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        self.presenter?.showDetailOf(index: indexPath.row)
    }
}

// MARK: TableViewDatasource
extension TransactionHistoryViewController: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return transactions.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "TransactionHistoryTableViewCell") as!  TransactionHistoryTableViewCell
        cell.model = self.transactions.elementAt(index: indexPath.row)
        cell.setup()
        return cell
    }
}