//
//  Profile.swift
//  LoopFollow
//
//  Created by Jonas Björkert on 2023-10-05.
//  Copyright © 2023 Jon Fawcett. All rights reserved.
//

import Foundation
extension MainViewController {
    // NS Profile Web Call
    func webLoadNSProfile() {
        NightscoutUtils.executeRequest(eventType: .profile, parameters: [:]) { (result: Result<NSProfile, Error>) in
            switch result {
            case .success(let profileData):
                self.updateProfile(profileData: profileData)
            case .failure(let error):
                LogManager.shared.log(category: .nightscout, message: "webLoadNSProfile, error fetching profile data: \(error.localizedDescription)")
            }
        }
    }
    
    // NS Profile Response Processor
    func updateProfile(profileData: NSProfile) {
        guard let store = profileData.store["default"] ?? profileData.store["Default"] else {
            return
        }
        profileManager.loadProfile(from: profileData)
        infoManager.updateInfoData(type: .profile, value: profileData.defaultProfile)
        
        basalProfile.removeAll()
        for basalEntry in store.basal {
            let entry = basalProfileStruct(value: basalEntry.value, time: basalEntry.time, timeAsSeconds: basalEntry.timeAsSeconds)
            basalProfile.append(entry)
        }
        
        // Don't process the basal or draw the graph until after the BG has been fully processeed and drawn
        if firstGraphLoad { return }
        
        var basalSegments: [DataStructs.basalProfileSegment] = []
        
        let graphHours = 24 * UserDefaultsRepository.downloadDays.value
        // Build scheduled basal segments from right to left by
        // moving pointers to the current midnight and current basal
        var midnight = dateTimeUtils.getTimeIntervalMidnightToday()
        var basalProfileIndex = basalProfile.count - 1
        var start = midnight + basalProfile[basalProfileIndex].timeAsSeconds
        var end = dateTimeUtils.getNowTimeIntervalUTC()
        // Move back until we're in the graph range
        while start > end {
            basalProfileIndex -= 1
            start = midnight + basalProfile[basalProfileIndex].timeAsSeconds
        }
        // Add records while they're still within the graph
        let graphStart = dateTimeUtils.getTimeIntervalNHoursAgo(N: graphHours)
        while end >= graphStart {
            let entry = DataStructs.basalProfileSegment(
                basalRate: basalProfile[basalProfileIndex].value, startDate: start, endDate: end)
            basalSegments.append(entry)
            
            basalProfileIndex -= 1
            if basalProfileIndex < 0 {
                basalProfileIndex = basalProfile.count - 1
                midnight = midnight.advanced(by: -24*60*60)
            }
            end = start - 1
            start = midnight + basalProfile[basalProfileIndex].timeAsSeconds
        }
        // reverse the result to get chronological order
        basalSegments.reverse()
        
        var firstPass = true
        // Runs the scheduled basal to the end of the prediction line
        var predictionEndTime = dateTimeUtils.getNowTimeIntervalUTC() + (3600 * UserDefaultsRepository.predictionToLoad.value)
        basalScheduleData.removeAll()
        
        for i in 0..<basalSegments.count {
            let timeStart = dateTimeUtils.getTimeIntervalNHoursAgo(N: graphHours)
            
            // This processed everything after the first one.
            if firstPass == false
                && basalSegments[i].startDate <= predictionEndTime {
                let startDot = basalGraphStruct(basalRate: basalSegments[i].basalRate, date: basalSegments[i].startDate)
                basalScheduleData.append(startDot)
                var endDate = basalSegments[i].endDate
                
                // if it's the last one needed, set it to end at the prediction end time
                if endDate > predictionEndTime || i == basalSegments.count - 1 {
                    endDate = Double(predictionEndTime)
                }
                
                let endDot = basalGraphStruct(basalRate: basalSegments[i].basalRate, date: endDate)
                basalScheduleData.append(endDot)
            }
            
            // we need to manually set the first one
            // Check that this is the first one and there are no existing entries
            if firstPass == true {
                // check that the timestamp is > the current entry and < the next entry
                if timeStart >= basalSegments[i].startDate && timeStart < basalSegments[i].endDate {
                    // Set the start time to match the BG start
                    let startDot = basalGraphStruct(basalRate: basalSegments[i].basalRate, date: Double(timeStart + (60 * 5)))
                    basalScheduleData.append(startDot)
                    
                    // set the enddot where the next one will start
                    var endDate = basalSegments[i].endDate
                    let endDot = basalGraphStruct(basalRate: basalSegments[i].basalRate, date: endDate)
                    basalScheduleData.append(endDot)
                    firstPass = false
                }
            }
        }
        
        if UserDefaultsRepository.graphBasal.value {
            updateBasalScheduledGraph()
        }
    }
}