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package mx.trackermap.TrackerMap.controllers

import android.util.Log
import kotlinx.coroutines.DelicateCoroutinesApi
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.launch
import mx.trackermap.TrackerMap.client.apis.GeofencesApi
import mx.trackermap.TrackerMap.client.apis.ReportsApi
import mx.trackermap.TrackerMap.client.models.EventInformation
import mx.trackermap.TrackerMap.client.models.Position
import mx.trackermap.TrackerMap.client.models.Stop
import mx.trackermap.TrackerMap.utils.ReportDates

@DelicateCoroutinesApi
class ReportController(
    private val reportsApi: ReportsApi,
    private val geofencesApi: GeofencesApi
) {

    sealed class Report {
        class PositionsReport(val positions: Array<Position>) : Report()
        class EventsReport(val events: Array<EventInformation>) : Report()
        class StopsReport(val stops: Array<Stop>) : Report()
        class XlsxReport(val data: ByteArray) : Report()
        object LoadingReport: Report()
    }

    enum class ReportType {
        POSITIONS, EVENTS, STOPS
    }

    val reportFlow: MutableStateFlow<Report> = MutableStateFlow(Report.LoadingReport)

    fun fetchReport(
        deviceId: Int,
        reportType: ReportType?,
        reportPeriod: ReportDates.ReportPeriod?,
        xlsx: Boolean = false,
        eventTypes: List<EventInformation.Type> = listOf()
    ) {
        if (reportType == null || reportPeriod == null) {
            return
        }

        val (currentDate, previousDate) = ReportDates.getDates(reportPeriod)
        Log.d("UnitReportsVM", "Current report type: $reportType")
        Log.d("UnitReportsVM", "Current report period: $reportType")
        Log.d("UnitReportsVM", "Current date:${currentDate}")
        Log.d("UnitReportsVM", "Previous date:${previousDate}")

        if (!xlsx) {
            reportFlow.value = Report.LoadingReport
        }
        GlobalScope.launch {
            when (reportType) {
                ReportType.POSITIONS -> fetchPositions(deviceId, previousDate, currentDate, xlsx)
                ReportType.EVENTS -> fetchEvents(deviceId, previousDate, currentDate, eventTypes, xlsx)
                ReportType.STOPS -> fetchStops(deviceId, previousDate, currentDate, xlsx)
            }
        }
    }

    private suspend fun fetchPositions(
        deviceId: Int,
        from: String,
        to: String,
        xlsx: Boolean
    ) {
        Log.d("UnitReportsVM", "Fetching positions")

        if (!xlsx) {
            val result = reportsApi.reportsRouteGet(from, to, deviceId)
            Log.d("UnitReportsVM", "Positions report: $result")
            reportFlow.value = Report.PositionsReport(result)
        } else {
            val result = reportsApi.reportsRouteGetXlsx(from, to, deviceId)
            Log.d("UnitReportsVM", "Positions report: $result")
            reportFlow.value = Report.XlsxReport(result)
        }

    }

    private suspend fun fetchEvents(
        deviceId: Int,
        from: String,
        to: String,
        types: List<EventInformation.Type>,
        xlsx: Boolean
    ) {
        Log.d("UnitReportsVM", "Fetching events")

        if (!xlsx) {
            val positionsResult = reportsApi.reportsRouteGet(from, to, deviceId)
            val eventsResult = reportsApi.reportsEventsGet(
                from, to, EventInformation.reportTypesToStrings(types), deviceId
            )
            val geofencesResult = geofencesApi.geofencesGet(all = true)

            val result = mutableListOf<EventInformation>()
            eventsResult.forEach { event ->
                result.add(EventInformation(
                    event = event,
                    position = positionsResult.find { it.id == event.positionId },
                    geofence = geofencesResult.find { it.id == event.geofenceId }
                ))
            }

            Log.d("UnitReportsVM", "Events report: $result")
            reportFlow.value = Report.EventsReport(result.toTypedArray())
        } else {
            val result = reportsApi.reportsEventsGetXlsx(
                from, to, EventInformation.reportTypesToStrings(types), deviceId
            )

            Log.d("UnitReportsVM", "Events report: $result")
            reportFlow.value = Report.XlsxReport(result)
        }
    }

    private suspend fun fetchStops(
        deviceId: Int,
        from: String,
        to: String,
        xlsx: Boolean
    ) {
        Log.d("UnitReportsVM", "Fetching stops")

        if (!xlsx) {
            val result = reportsApi.reportsStopsGet(from, to, deviceId)
            Log.d("UnitReportsVM", "Stops report: $result")
            reportFlow.value = Report.StopsReport(result)
        } else {
            val result = reportsApi.reportsStopsGetXlsx(from, to, deviceId)
            Log.d("UnitReportsVM", "Stops report: $result")
            reportFlow.value = Report.XlsxReport(result)
        }

    }
}