import Fluent
import Vapor



struct CODDate {
    let month:Int
    let year:Int
    let day: Int
    let hour:Int
    let minute:Int
}




struct StatsController: RouteCollection {
    func boot(routes: RoutesBuilder) throws {
        let statsRoute = routes.grouped("cod-tracker","api", "stats")
        
        statsRoute.get("allMatches", use: index)
        statsRoute.get("totalWins", use: totalWins)
        statsRoute.get("totalLosses", use: totalLosses)
        statsRoute.get("overall", use: overall)
        statsRoute.get("all", use: all)
        statsRoute.get("allDaily", use: allDaily)
        
    }
    
    func index(req: Request) throws -> EventLoopFuture<[Match]> {
        return Match.query(on: req.db).sort(\.$date).all()
    }
    
    
    func totalWins(req: Request) throws -> EventLoopFuture<Int> {
        return Match.query(on: req.db)
            .filter(\.$win == true)
            .count()
    }
    
    func totalLosses(req: Request) throws -> EventLoopFuture<Int> {
        return Match.query(on: req.db)
            .filter(\.$win == false)
            .count()
    }
    
    func getMarchStats(req:Request) throws -> EventLoopFuture<Stats> {
        return getstatsForMonth(year: 2020, month: 03, req: req)
    }
    
    func getstatsForMonth(year:Int, month:Int, req: Request) -> EventLoopFuture<Stats>{
        
        let winCount = Match.query(on: req.db)
            .filter(\.$date >= getStartOfMonth(month: month, year: year))
            .filter(\.$date <= getEndOfMonth(month: month, year: year))
            .filter(\.$win == true )
            .count()
        
        
        let lossCount = Match.query(on: req.db)
            .filter(\.$date >= getStartOfMonth(month: month, year: year))
            .filter(\.$date <= getEndOfMonth(month: month, year: year))
            .filter(\.$win == false )
            .count()
        
        let combined = winCount.and(lossCount)
        
        return combined.map { (winCount, lossCount) -> (Stats) in
            let ratio:Double = (Double(winCount) / Double(lossCount)).truncate(places: 2)
            return  Stats.init(winLoss: String(ratio), totalWins: winCount, totalLosses: lossCount)
        }
    }
    
    func getStatsForDay(year:Int, month:Int, day:Int, req: Request) -> EventLoopFuture<Stats>{
        
        let winCount = Match.query(on: req.db)
            .filter(\.$date >= getStartOfDay(day:day, month: month, year: year))
            .filter(\.$date <= getEndOfDay(day: day, month: month, year: year))
            .filter(\.$win == true )
            .count()
        
        
        let lossCount = Match.query(on: req.db)
            .filter(\.$date >= getStartOfDay(day:day, month: month, year: year))
            .filter(\.$date <= getEndOfDay(day: day, month: month, year: year))
            .filter(\.$win == false )
            .count()
        
        let combined = winCount.and(lossCount)
        
        return combined.map { (winCount, lossCount) -> (Stats) in
            
            return  Stats.init(winLoss: self.getRatio(num: Double(winCount), den: Double(lossCount)), totalWins: winCount, totalLosses: lossCount)
        }
    }
    
    
    func statsForRecent(numberGames:Int, req:Request) -> EventLoopFuture<Stats> {
        
        let winCount = Match.query(on: req.db)
            .sort(\.$date)
            .range(lower: 0, upper: numberGames)
            .filter(\.$win == true )
            .count()
        
        
        let lossCount = Match.query(on: req.db)
            .sort(\.$date)
            .range(lower: 0, upper: numberGames)
            .filter(\.$win == false )
            .count()
        
        let combined = winCount.and(lossCount)
        
        return combined.map { (winCount, lossCount) -> (Stats) in
            let ratio:Double = (Double(winCount) / Double(lossCount)).truncate(places: 2)
            return  Stats.init(winLoss: String(ratio), totalWins: winCount, totalLosses: lossCount)
        }
    }
    
    
    
    
    private func getStartOfMonth(month:Int, year:Int) -> Date {
        let calendar = Calendar.current
        var components = DateComponents()
        components.timeZone = TimeZone(identifier: "GMT")
        components.day = 1
        components.month = month
        components.year = year
        components.hour = 0
        components.minute = 0
        return calendar.date(from: components)!
    }
    
    private func getEndOfMonth(month:Int, year:Int) -> Date {
        let calendar = Calendar.current
        var components = DateComponents()
        components.day = -0
        components.timeZone = TimeZone(identifier: "GMT")
        components.month = month + 1
        components.year = year
        components.hour = 23
        components.minute = 59
        return calendar.date(from: components)!
    }
    
    
    private func getStartOfDay(day:Int, month:Int, year:Int) -> Date {
        let calendar = Calendar.current
        var components = DateComponents()
        components.timeZone = TimeZone(identifier: "GMT")
        
        components.day = day
        components.month = month
        components.year = year
        components.hour = 0
        components.minute = 0
        return calendar.date(from: components)!
    }
    
    private func getEndOfDay(day:Int, month:Int, year:Int) -> Date {
        let calendar = Calendar.current
        var components = DateComponents()
        components.timeZone = TimeZone(identifier: "GMT")
        components.day = day
        components.month = month
        components.year = year
        components.hour = 23
        components.minute = 59
        return calendar.date(from: components)!
    }
    
    private func getStartDate() -> Date {
        
        let calendar = Calendar.current
        var components = DateComponents()
        components.timeZone = TimeZone(identifier: "GMT")
        components.day = 10
        components.month = 03
        components.year = 2020
        components.hour = 4
        components.minute = 0
        return  calendar.date(from: components)!
    }
    
    private func createDate(day:Int, month:Int, year:Int, hour:Int, minute:Int) -> Date {
        let calendar = Calendar.current
        
        var components = DateComponents()
        components.timeZone = TimeZone(identifier: "GMT")
        components.day = day
        components.month = month
        components.year = year
        components.hour = hour
        components.minute = minute
        return  calendar.date(from: components)!
    }
    
    func mostRecentDailyStats (req:Request) -> EventLoopFuture<Stats>{
        return getDaysPlayed(req: req).flatMap { (days) -> (EventLoopFuture<Stats>) in
            return self.getStatsForDay(year: days.first?.year ?? 0, month: days.first?.month ?? 0, day: days.first?.day ?? 0, req: req)
        }
    }
    
    
    
    
    func all(req: Request) throws -> EventLoopFuture<AllStats> {
        
        var date = getStartDate()
        var previousMonths:[CODDate] = []
        
        repeat {
            //let stats = getStatsByMonth(year: date.year, month: date.month, req: req) //returns eventloopfuture<Stats>
            previousMonths.append(CODDate(month: date.month, year: date.year, day: 15, hour:6, minute: 0))
            date =  Calendar.current.date(byAdding: .month, value: 1, to: date)!
        } while (date.month != (Date().month + 1) || date.year != Date().year)
        
        func getMonthStats (_ remaining: ArraySlice<CODDate>, allMonthlyStats: inout [MonthStats],  eventLoop: EventLoop) -> EventLoopFuture<[MonthStats]> {
            var remaining = remaining
            if let first = remaining.popLast() {
                
                
                
                return getstatsForMonth(year: first.year, month: first.month, req: req).flatMap { [remaining, allMonthlyStats] (stats) -> EventLoopFuture<[MonthStats]> in
                    var allMonthlyStats = allMonthlyStats
                    allMonthlyStats.append(MonthStats(month: first.month, year: first.year, stats:stats ))
                    return getMonthStats(remaining, allMonthlyStats:&allMonthlyStats,  eventLoop: eventLoop)
                }
                
            } else {
                return req.eventLoop.makeSucceededFuture(allMonthlyStats)
            }
        }
        
        var stats:[MonthStats] = []
        let monthstats = getMonthStats(previousMonths[0..<previousMonths.count], allMonthlyStats:&stats, eventLoop: req.eventLoop)
        let cumulativeRatios = getCumulativeWinLossRatios(req: req)
        let mostRecentDayStats = mostRecentDailyStats(req: req)
        
        return try overall(req: req).and(monthstats).and(cumulativeRatios).and(mostRecentDayStats).map { arg -> AllStats in
            
            let (((overall, monthlyStats), cumulativeRatios), mostRecentDayStats) = arg
            let highestWinLossRatio = cumulativeRatios.reduce("0") { (highestRatio, dataPoint) -> String in
                if dataPoint.y > Double(highestRatio)!{
                    return String(dataPoint.y)
                }
                return highestRatio
            }
            
            return AllStats.init(overall: overall, byMonth: monthlyStats, highestWinLossRatio: highestWinLossRatio, dataPoints: cumulativeRatios, mostRecentRecord: "\(mostRecentDayStats.totalWins) - \(mostRecentDayStats.totalLosses)")
        }
    }
    
    
    
    func overall(req: Request) throws -> EventLoopFuture<Stats> {
        
        let lossCount = Match.query(on: req.db)
            .filter(\.$win == false)
            .count()
        
        
        let winCount = Match.query(on: req.db)
            .filter(\.$win == true )
            .count()
        
        
        
        let combined = winCount.and(lossCount)
        
        
        return combined.map { (winCount, lossCount) -> (Stats) in
            return Stats.init(winLoss: self.getRatio(num: Double(winCount), den: Double(lossCount)), totalWins: winCount, totalLosses: lossCount)
        }
        
    }
    
    private func getRatio( num:Double, den:Double) -> String {
        
        var returnString = ""
        let deno = (den != 0) ? den : 1
        
        returnString = String((Double(num) / Double(deno)).truncate(places: 2))
        
        if den == 0 {
            returnString = returnString + "+"
        }
        return returnString
        
    }
    
    private func getDaysPlayed(req:Request) -> EventLoopFuture<[CODDate]> {
        
        return Match.query(on: req.db).sort(\.$date, .descending).all().map { (matches) -> ([CODDate]) in
            return matches.map { (match) -> CODDate in
                return CODDate(month: match.date.month, year: match.date.year, day: match.date.day, hour: match.date.hour, minute: match.date.minute)
            }.reduce([CODDate]()) { (datesPlayed, codDate) -> [CODDate] in
                
                if datesPlayed.contains(where: { (existingDate) -> Bool in
                    if codDate.month == existingDate.month && codDate.year == existingDate.year && existingDate.day == codDate.day{
                        return true
                    }
                    return false
                }){
                    return datesPlayed
                }else {
                    
                    return  datesPlayed + [codDate]
                }
            }
        }
        
        //        repeat {
        //            previousDays.append(CODDate(month: date.month, year: date.year, day: date.day, hour: date.hour, minute: date.minute))
        //            date =  Calendar.current.date(byAdding: .day, value: 1, to: date)!
        //        } while (date < Date())
        //
        //        return previousDays
    }
    
    
    func allDaily(req:Request) -> EventLoopFuture<AllDailyStats>{
        
        return getDaysPlayed(req: req).flatMap { (previousDays) ->  (EventLoopFuture<AllDailyStats>) in
            
            func getDailyStats (_ remaining: ArraySlice<CODDate>, allDailyStats: inout [DailyStats],  eventLoop: EventLoop) -> EventLoopFuture<[DailyStats]> {
                var remaining = remaining
                if let first = remaining.popLast() {
                    
                    return self.getStatsForDay(year: first.year, month: first.month, day:first.day,  req: req).flatMap { [remaining, allDailyStats] (stats) -> EventLoopFuture<[DailyStats]> in
                        var allDailyStats = allDailyStats
                        
                        let totalWins = allDailyStats.reduce(Double(stats.totalWins)) { (total, dailyStats) -> Double in
                            return total + Double(dailyStats.stats.totalWins)                    }
                        
                        let totalLosses = allDailyStats.reduce(Double(stats.totalLosses)) { (total, dailyStats) -> Double in
                            return total + Double(dailyStats.stats.totalLosses)
                        }
                        
                        allDailyStats.append(DailyStats(day: first.day, month: first.month, year: first.year, stats: stats, cumulativeRatio: self.getRatio(num: totalWins, den: totalLosses)))
                        return getDailyStats(remaining, allDailyStats:&allDailyStats,  eventLoop: eventLoop)
                    }
                    
                } else {
                    return req.eventLoop.makeSucceededFuture(allDailyStats)
                }
            }
            
            
            var stats:[DailyStats] = []
            let dailyStats = getDailyStats(Array(previousDays)[0..<previousDays.count], allDailyStats:&stats, eventLoop: req.eventLoop)
            
            return  dailyStats.map {  (dailyStats) -> AllDailyStats in
                return AllDailyStats(dailyStats: dailyStats.filter({ (dailyStats) -> Bool in
                    
                    if dailyStats.stats.totalWins == 0 && dailyStats.stats.totalLosses == 0 {
                        return false
                    }
                    return true
                }).reversed()
                    
                )
            }
        }
    }
    
    
    func getCumulativeWinLossRatios(req:Request) -> EventLoopFuture<[DataPoint]> {
        
        // let previousDays = getDaysPlayed().reversed()
        
        
        return getDaysPlayed(req: req).flatMap { (previousDays) ->  (EventLoopFuture<[DataPoint]>) in
            
            
            
            func getRatios (_ remaining: ArraySlice<CODDate>, allDailyStats: inout [DailyStats], cumulativeWinLossRatios: inout [DataPoint], eventLoop: EventLoop) -> EventLoopFuture<[DataPoint]> {
                var remaining = remaining
                if let first = remaining.popLast() {
                    
                    return self.getStatsForDay(year: first.year, month: first.month, day:first.day,  req: req).flatMap { [remaining, allDailyStats, cumulativeWinLossRatios] (stats) -> EventLoopFuture<[DataPoint]> in
                        var allDailyStats = allDailyStats
                        
                        let totalWins = allDailyStats.reduce(Double(stats.totalWins)) { (total, dailyStats) -> Double in
                            return total + Double(dailyStats.stats.totalWins)                    }
                        
                        let totalLosses = allDailyStats.reduce(Double(stats.totalLosses)) { (total, dailyStats) -> Double in
                            return total + Double(dailyStats.stats.totalLosses)
                        }
                        
                        var cumulativeWinLossRatios = cumulativeWinLossRatios
                        if !(stats.totalWins == 0 && stats.totalLosses == 0) {
                            
                            let date = self.createDate(day: first.day, month: first.month, year: first.year, hour: first.hour + 6, minute:first.minute) // 6 hours to make sure we pick a time that isnt  on borders of us time zones
                            print ("p \(date.timeIntervalSince1970)")
                            let x = Double(cumulativeWinLossRatios.count)
                            
                            let d = Date(timeIntervalSince1970: date.timeIntervalSince1970)
                            cumulativeWinLossRatios.append(DataPoint(x:x , y: (totalWins/totalLosses).truncate(places: 2), label:("\(Utilities.monthToString(month: d.month)) \(d.day)")))
                        }
                        allDailyStats.append(DailyStats(day: first.day, month: first.month, year: first.year, stats: stats, cumulativeRatio: self.getRatio(num: totalWins, den: totalLosses)))
                        return getRatios(remaining, allDailyStats:&allDailyStats,  cumulativeWinLossRatios:&cumulativeWinLossRatios, eventLoop: eventLoop)
                    }
                    
                } else {
                    return req.eventLoop.makeSucceededFuture(cumulativeWinLossRatios)
                }
            }
            
            var stats:[DailyStats] = []
            var cumulativeWinLossRatios:[DataPoint] = [DataPoint]()
            
            
            return getRatios(Array(previousDays)[0..<previousDays.count], allDailyStats: &stats, cumulativeWinLossRatios: &cumulativeWinLossRatios, eventLoop: req.eventLoop)
        }
    }
}


extension Double
{
    func truncate(places : Int)-> Double
    {
        return Double(floor(pow(10.0, Double(places)) * self)/pow(10.0, Double(places)))
    }
}

extension Date {
    
    var month:Int {
        
        var calendar = Calendar.current
        calendar.timeZone = TimeZone(identifier: "GMT")!
        let calanderDate = calendar.dateComponents([.minute, .month, .year, .hour, .day], from: self)
        return calanderDate.month ?? 1
    }
    
    var year:Int {
        
        var calendar = Calendar.current
        calendar.timeZone = TimeZone(identifier: "GMT")!
        let calanderDate = calendar.dateComponents([.minute, .month, .year, .hour, .day], from: self)
        return calanderDate.year ?? 1
    }
    
    var day:Int {
        
        var calendar = Calendar.current
        calendar.timeZone = TimeZone(identifier: "GMT")!
        let calanderDate = calendar.dateComponents([.minute, .month, .year, .hour, .day], from: self)
        return calanderDate.day ?? 1
    }
    
    var hour:Int {
        
        var calendar = Calendar.current
        calendar.timeZone = TimeZone(identifier: "GMT")!
        let calanderDate = calendar.dateComponents([.minute, .month, .year, .hour, .day], from: self)
        return calanderDate.hour ?? 1
    }
    
    
    var minute:Int {
        var calendar = Calendar.current
        calendar.timeZone = TimeZone(identifier: "GMT")!
        let calanderDate = calendar.dateComponents([.minute, .month, .year, .hour, .day], from: self)
        return calanderDate.minute ?? 1
    }
    
}