package net.pokeranalytics.android.model

import io.realm.Realm
import io.realm.Sort
import io.realm.kotlin.where
import net.pokeranalytics.android.exceptions.PokerAnalyticsException
import net.pokeranalytics.android.model.filter.QueryCondition
import net.pokeranalytics.android.model.interfaces.Identifiable
import net.pokeranalytics.android.model.realm.*
import java.util.*

sealed class Criteria {
    abstract class RealmCriteria : Criteria() {
        inline fun <reified T:Identifiable> comparison(): List<QueryCondition> {
            return compare < QueryCondition.QueryDataCondition<Identifiable>, T >()
        }
    }

    abstract class SimpleCriteria(private val conditions:List<QueryCondition>): Criteria() {
        fun comparison(): List<QueryCondition> {
            return conditions
        }
    }

    abstract class StaticCriteria : Criteria() {
        inline fun <reified T:QueryCondition.StaticDataQueryCondition> comparison(): List<QueryCondition> {
            QueryCondition.distinct<Session, T>()?.let {
                val values = it.mapNotNull { session ->
                    when (this) {
                        is Limits -> session.limit
                        is TournamentTypes -> session.tournamentType
                        is TableSizes -> session.tableSize
                        //is TournamentFees -> session.tournamentEntryFee
                        else -> null
                    }
                }
                return compare<T>(values)
            }
            return listOf<T>()
        }
    }

    object Bankrolls: RealmCriteria()
    object Games: RealmCriteria()
    object TournamentNames: RealmCriteria()
    object Locations: RealmCriteria()
    object TournamentFeatures: RealmCriteria()
    object Limits: StaticCriteria()
    object TableSizes: StaticCriteria()
    object TournamentTypes: StaticCriteria()
    object monthOfYear:  SimpleCriteria(List(12) { index -> QueryCondition.MONTH().apply { intValue = index } })
    object dayOfWeek: SimpleCriteria(List(7) { index -> QueryCondition.DAY_OF_WEEK().apply { intValue = index } })
    object SessionType: SimpleCriteria(listOf(QueryCondition.CASH, QueryCondition.TOURNAMENT))
    object BankrollType: SimpleCriteria(listOf(QueryCondition.LIVE, QueryCondition.ONLINE))
    object dayPeriod: SimpleCriteria(listOf(QueryCondition.WEEK_DAY, QueryCondition.WEEK_END))
    object Year: Criteria()
    object Blinds: Criteria()
    //object TournamentFees: StaticCriteria()

    val queryConditions: List<QueryCondition>
        get() {
            return when (this) {
                is Bankrolls -> comparison<Bankroll>()
                is Games -> comparison<Game>()
                is TournamentFeatures-> comparison<TournamentFeature>()
                is TournamentNames-> comparison<TournamentName>()
                is Locations -> comparison<Location>()
                is SimpleCriteria -> comparison()
                is Limits -> comparison<QueryCondition.LIMIT>()
                is TournamentTypes -> comparison<QueryCondition.TOURNAMENT_TYPE>()
                is TableSizes -> comparison<QueryCondition.TABLE_SIZE>()
                is Year -> {
                    val years = arrayListOf<QueryCondition.YEAR>()
                    val calendar = Calendar.getInstance()
                    calendar.time = Date()
                    val yearNow = calendar.get(Calendar.YEAR)
                    val realm = Realm.getDefaultInstance()
                    realm.where<Session>().sort("year", Sort.ASCENDING).findFirst()?.year?.let {
                        for (index in 0..(yearNow - it)) {
                            years.add(QueryCondition.YEAR().apply {
                                intValue = yearNow - index
                            })
                        }
                    }
                    realm.close()
                    years
                }
                is Blinds -> {
                    val blinds = arrayListOf<QueryCondition.BLIND>()
                    val realm = Realm.getDefaultInstance()
                    realm.where<Session>().distinct("blinds", "bankroll.currency.code").findAll().sort("cgSmallBlind", Sort.ASCENDING).map {
                        it.blinds?.let { stake ->
                            blinds.add(QueryCondition.BLIND().apply {
                                blind = stake
                                hasDefaultCurrency = it.hasDefaultCurrency
                            })
                        }
                    }
                    realm.close()
                    blinds
                }
                else -> throw PokerAnalyticsException.QueryTypeUnhandled
            }
        }

    companion object {
        inline fun < reified  S : QueryCondition.QueryDataCondition<Identifiable>, reified T : Identifiable > compare(): List<S> {
            val objects = arrayListOf<S>()
            val realm = Realm.getDefaultInstance()
            realm.where<T>().findAll().forEach {
                objects.add((QueryCondition.getInstance<T>() as S).apply {
                    setObject(it)
                })
            }
            realm.close()
            return objects
        }

        inline fun < reified  S : QueryCondition.StaticDataQueryCondition > compare(values:List<Int>): List<S> {
            val objects = arrayListOf<S>()
            values.forEach {
                objects.add((S::class.java.newInstance()).apply {
                    intValues = arrayListOf(it)
                })
            }
            return objects
        }
    }

    fun List<Criteria>.combined(): List<List<QueryCondition>> {
        val comparatorList = ArrayList<List<QueryCondition>>()
        this.forEach {
            comparatorList.add(it.queryConditions)
        }
        return getCombinations(comparatorList)
    }

    private fun <T> getCombinations(lists: List<List<T>>): List<List<T>> {
        var combinations: MutableSet<List<T>> = LinkedHashSet()
        var newCombinations: MutableSet<List<T>>

        var index = 0

        // extract each of the integers in the first list
        // and add each to ints as a new list
        if (lists.isNotEmpty()) {
            for (i in lists[0]) {
                val newList = ArrayList<T>()
                newList.add(i)
                combinations.add(newList)
            }
            index++
        }
        while (index < lists.size) {
            val nextList = lists[index]
            newCombinations = LinkedHashSet()
            for (first in combinations) {
                for (second in nextList) {
                    val newList = ArrayList<T>()
                    newList.addAll(first)
                    newList.add(second)
                    newCombinations.add(newList)
                }
            }
            combinations = newCombinations

            index++
        }

        return combinations.toList()
    }
}