//
//  ShareClientExtension.swift
//  LoopFollow
//
//  Created by Jose Paredes on 7/13/20.
//  Copyright © 2020 Jon Fawcett. All rights reserved.
//

import Foundation
import ShareClient

public struct ShareGlucoseData: Codable {
   var sgv: Int
   var date: TimeInterval
   var direction: String?
}

private var TrendTable: [String] = [
   "NONE",            // 0
   "DoubleUp",        // 1
   "SingleUp",        // 2
   "FourtyFiveUp",    // 3
   "Flat",            // 4
   "FourtyFiveDown",  // 5
   "SingleDown",      // 6
   "DoubleDown"       // 7
]

// TODO: probably better to make this an inherited class rather than an extension
extension ShareClient {

    public func fetchData(_ entries: Int, callback: @escaping (ShareError?, [ShareGlucoseData]?) -> Void) {
        
        self.fetchLast(entries) { (error, result) -> () in
            guard error == nil || result != nil else {
                return callback(error, nil)
            }
            
            // parse data to conanical form
            var shareData = [ShareGlucoseData]()
            for i in 0..<result!.count {
                
                var trend = Int(result![i].trend)
                if(trend < 0 || trend > TrendTable.count-1) {
                    trend = 0
                }
            
                let newShareData = ShareGlucoseData(
                    sgv: Int(result![i].glucose),
                    date: result![i].timestamp.timeIntervalSince1970,
                    direction: TrendTable[trend]
                )
                shareData.append(newShareData)
            }
            callback(nil,shareData)
         }
    }
}