// ----------------------------------------------------------------------------
//
//  FirebaseLogAnalytics.swift
//
//  @author     Nikita Semakov <SemakovNV@ekassir.com>
//  @copyright  Copyright (c) 2017, eKassir Ltd. All rights reserved.
//  @link       http://www.ekassir.com/
//
// ----------------------------------------------------------------------------

import FirebaseAnalytics

// ----------------------------------------------------------------------------

public final class FirebaseLogAnalytics: AnalyticsContract
{
// MARK: - Construction

    public static let shared = FirebaseLogAnalytics()

    private init() {
        // Do nothing
    }

// MARK: - Methods

    public func log(event: AnalyticsEvent, screen: Analytics.ScreenName?)
    {
        if Analytics.isLoggable()
        {
            FIRAnalytics.setScreenName(screen?.rawValue, screenClass: nil)
            FIRAnalytics.setUserID(self.trackingId)

            var parameters: [String : NSObject] = [FirebaseKeys.Category.rawValue : event.category]

            if let label = event.label {
                parameters[FirebaseKeys.Label.rawValue] = label
            }

            if let value = event.value {
                parameters[FirebaseKeys.Value.rawValue] = value
            }

            FIRAnalytics.logEventWithName(event.action, parameters: parameters)
        }
    }

    public func logScreenOpen(screen: Analytics.ScreenName)
    {
        if Analytics.isLoggable()
        {
            FIRAnalytics.setScreenName(screen.rawValue, screenClass: nil)
            FIRAnalytics.logEventWithName(Inner.OpenScreenAction, parameters: nil)
        }
    }

    func setTrackingId(trackingId: String?) {
        self.trackingId = trackingId
    }

// MARK: - Private Functions

    // ...

// MARK: - Inner Types

    enum FirebaseKeys: String
    {
        case Label  = "label"
//        case Action = "action" // use "name" parameter in function instead
        case Category  = "category"
        case Value  = "value"
    }

// MARK: - Constants

    private struct Inner {
        static let OpenScreenAction = "open_screen_action"
    }

// MARK: - Variables

    private var trackingId: String?

}

// ----------------------------------------------------------------------------