FirebaseDataTableViewController.swift

//
//  FirebaseDataTableViewController.swift
//  MyFootPrints
//
//  Created by Tetsuya Shiraishi on 2017/04/11.
//  Copyright © 2017年 MUSHIKAGO DESIGN STUDIO CO., LTD. All rights reserved.
//

import UIKit
import Firebase

class FirebaseDataTableViewController: UITableViewController {
    
    let kUserPath = "user"
    let kDocumentsPath = "documents"
    let kLabelString = "label"
    
    var iRootRef:FIRDatabaseReference!
    var iThisRef:FIRDatabaseReference?
    var iTableData:[FIRDataSnapshot] = [FIRDataSnapshot]()
    
    
    @IBAction func addItemButtonAction(_ sender: UIBarButtonItem) {
        
        if let _ = FIRAuth.auth()?.currentUser {
            
            let alert = UIAlertController(title: "新規追加", message: "追加するアイテムのラベル名を入力してください。", preferredStyle: .alert)
            alert.addTextField(configurationHandler: { (textField:UITextField) -> Void in
                //            textField.text = "default text."
                textField.placeholder = "ラベル名"
            })
            alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action:UIAlertAction) -> Void in
                let textField = alert.textFields![0] as UITextField
                print("Text field: \(textField.text)")
                
                let str:String = textField.text!
                let _data : Dictionary<String, AnyObject> = [
                    self.kLabelString: str as AnyObject
                ]
                
                let newChild = self.iThisRef?.childByAutoId()
                newChild?.setValue(_data)
            }))
            
            alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action:UIAlertAction) -> Void in
                print("Text field: cancel")
            }))
            
            self.present(alert, animated: true, completion: nil)
            
            
        } else {
            print("No user is signed in.")
        }
        
    }
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        iRootRef = FIRDatabase.database().reference()
        
        observeData()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return iTableData.count
    }

    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

        let label:FIRDataSnapshot = self.iTableData[indexPath.row].childSnapshot(forPath: self.kLabelString)
        
        if label.exists() {
            cell.textLabel?.text = label.value as? String
        }else{
            cell.textLabel?.text = self.iTableData[indexPath.row].key
        }
        
        return cell
    }
    

    
    // Override to support editing the table view.
    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            // Delete the row from the data source
            //tableView.deleteRows(at: [indexPath], with: .fade)
            self.iThisRef?.child(self.iTableData[indexPath.row].key).removeValue()
        } else if editingStyle == .insert {
            // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
        }    
    }
    

    func observeData(){
        if let user = FIRAuth.auth()?.currentUser {
            self.iThisRef = iRootRef.child(self.kUserPath).child(user.uid).child(self.kDocumentsPath)
            
            self.iThisRef?.observe(FIRDataEventType.value, with: { (snapshot:FIRDataSnapshot) in
                
                var tempArray = [FIRDataSnapshot]()
                
                for item in snapshot.children {
                    let child = item as! FIRDataSnapshot
                    tempArray.append(child)
                }
                
                self.iTableData = tempArray
                self.tableView.reloadData()
            })
        }
    }
    
}