//
//  MasterViewController.swift
//  JSONCreator
//
//  Created by Scott Pfeil on 8/2/19.
//  Copyright © 2019 Verizon Wireless. All rights reserved.
//

import MVMCore


class MasterViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    //--------------------------------------------------
    // MARK: - Outlets
    //--------------------------------------------------
    
    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var ipTextField: UITextField!
    @IBOutlet weak var requestButton: UIButton!
    @IBOutlet weak var listOptionControl: UISegmentedControl!
    
    //--------------------------------------------------
    // MARK: - Properties
    //--------------------------------------------------
    
    var structureModels: [StructureCategoryModel] = []
    
    //--------------------------------------------------
    // MARK: - Life Cycle
    //--------------------------------------------------
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.delegate = self
        tableView.dataSource = self
        tableView.estimatedRowHeight = 80
        tableView.rowHeight = UITableView.automaticDimension
        
        ipTextField.text = "127.0.0.1:8181"
        requestButton.layer.cornerRadius = 15.0
        requestButton.backgroundColor = UIColor.mfGet(forHex: "#d0261d")
        
        guard let ip = ipTextField.text else { return }
        
        let requestParameters = MVMCoreRequestParameters(actionMap: [:])
        requestParameters?.parameters = ["category": "Atoms", "filename": "Button"]
        requestParameters?.alternateBaseURL = URL(string: "http://\(ip)/v1/fetchAllMolecules")
        
        let errorLocation = (MVMCoreLoadHandler.sharedGlobal()?.errorLocation(forRequest: MVMCoreSessionTimeHandler.sharedSession(), pageType: "", modules: ""))!
        
        DispatchQueue.global(qos: .default).async {
            MVMCoreLoadHandler.sharedGlobal()?.sendRequest(requestParameters!, locationForError: errorLocation, requestFinished: { json, error in
                
                guard error == nil else { return }
                
                self.fetchAllMolecules(from: json)
                
                DispatchQueue.main.async {
                    self.tableView.reloadData()
                }
            })
        }
    }
    
    func getData(for indexPath: IndexPath) -> String? {
        
        let selectedValue = structureModels[indexPath.section].structures[indexPath.row].value
        
        // TODO:... Pretty much all '\t' need an additional \t...
        
        switch listOptionControl.selectedSegmentIndex {
        case 1:
            return """
                   {
                        "moleculeName": "listItem",
                        "molecule": \(selectedValue)
                   }
                   """
            
        case 2:
            return """
                   {
                        "moleculeName": "stackItem",
                        "molecule": \(selectedValue)
                   }
                   """
            
        default:
            return selectedValue
        }
    }
    
    //--------------------------------------------------
    // MARK: - Table View
    //--------------------------------------------------
    
    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return structureModels[section].category.capitalized
    }
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return structureModels.count
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return structureModels[section].structures.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
        
        cell.textLabel?.text = structureModels[indexPath.section].structures[indexPath.row].key
        
        if cell.interactions.first == nil {
            let dragInteraction = UIDragInteraction(delegate: self)
            cell.addInteraction(dragInteraction)
        }
        
        return cell
    }
    
    func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the specified item to be editable.
        return true
    }
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        
        UIPasteboard.general.string = getData(for: indexPath)
        
        let label = UILabel(frame: .zero)
        label.clipsToBounds = true
        label.backgroundColor = .gray
        label.text = "\tCopied\t"
        label.font = UIFont.systemFont(ofSize: 30)
        label.translatesAutoresizingMaskIntoConstraints = false
        label.layer.cornerRadius = 5
        view.superview!.addSubview(label)
        label.centerXAnchor.constraint(equalTo: view.superview!.centerXAnchor).isActive = true
        label.centerYAnchor.constraint(equalTo: view.superview!.centerYAnchor).isActive = true
        
        UIView.animate(withDuration: 2, animations: {
            label.alpha = 0
        }) { completed in
            label.removeFromSuperview()
        }
    }
    
    //--------------------------------------------------
    // MARK: - Methods
    //--------------------------------------------------
    
    @IBAction func requestMolecules(_ sender: UIButton) {
        
        guard let ip = ipTextField.text else { return }
        
        let requestParameters = MVMCoreRequestParameters(actionMap: [:])
        requestParameters?.parameters = ["category": "Atoms", "filename": "Button"]
        requestParameters?.alternateBaseURL = URL(string: "http://\(ip)/v1/fetchAllMolecules")
        
        let errorLocation = (MVMCoreLoadHandler.sharedGlobal()?.errorLocation(forRequest: MVMCoreSessionTimeHandler.sharedSession(), pageType: "", modules: ""))!
        
        MVMCoreDispatchUtility.performBlock(inBackground: {
            MVMCoreLoadHandler.sharedGlobal()?.sendRequest(requestParameters!, locationForError: errorLocation, requestFinished: { json, error in
                
                guard error == nil else { return }
                
                do {
                    try self.fetchAllMolecules(from: json)
                    
                    MVMCoreDispatchUtility.performSyncBlock(onMainThread: {
                        self.tableView.reloadData()
                    })
                } catch let myJSONError {
                    print(myJSONError)
                }
            })
        })
    }
    
    func setDetailPage() {
        ((self.splitViewController?.viewControllers[1] as? UINavigationController)?.topViewController as? DetailViewController)?.textView.text = ""
    }
    
    private func fetchAllMolecules(from json: Any?) {
        
        structureModels = []
        
        guard let serverJSON = json,
            let data = try? JSONSerialization.data(withJSONObject: serverJSON, options: .prettyPrinted),
            let convertedString = String(data: data, encoding: .utf8)?.data(using: .utf8),
            let categoryDictionary = try? JSONSerialization.jsonObject(with: convertedString, options: []) as? [AnyHashable: Any]
            else { return }
        
        // Cycle through the categories passed from server.
        for (categoryName, content) in categoryDictionary {
            
            guard let category = categoryName as? String else { continue }
            
            let structureCategoryModel = StructureCategoryModel(category: category)
            
            guard let data = try? JSONSerialization.data(withJSONObject: content, options: .prettyPrinted),
                let convertedString = String(data: data, encoding: .utf8)?.data(using: .utf8),
                let categoryContent = try? JSONSerialization.jsonObject(with: convertedString, options: []) as? [String: String]
                else { continue }
            
            // Cycle through the molecules held by a category.
            for (structureName, structureValue) in categoryContent {
                structureCategoryModel.structures.append((key: structureName, value: structureValue))
            }
            
            structureModels.append(structureCategoryModel)
        }
    }
}

// MARK:- Drag Interaction Delegate
extension MasterViewController: UIDragInteractionDelegate {
    
    func dragInteraction(_ interaction: UIDragInteraction, itemsForBeginning session: UIDragSession) -> [UIDragItem] {
        
        let location = session.location(in: tableView)
        
        guard let indexPath = tableView.indexPathForRow(at: location),
            let content = getData(for: indexPath)
            else { return [] }
        
        let provider = NSItemProvider(object: content as NSString)
        let item = UIDragItem(itemProvider: provider)
        
        return [item]
    }
}