# ObservationsRepository.kt

    /*
     * The MIT License
     *
     * Original work sponsored and donated by The Danish Health Data Authority (http://www.sundhedsdatastyrelsen.dk)
     *
     * Copyright (C) 2020 The Danish Health Data Authority (http://www.sundhedsdatastyrelsen.dk)
     *
     *
     * Permission is hereby granted, free of charge, to any person obtaining a copy of
     * this software and associated documentation files (the "Software"), to deal in
     * the Software without restriction, including without limitation the rights to
     * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
     * of the Software, and to permit persons to whom the Software is furnished to do
     * so, subject to the following conditions:
     *
     *
     * The above copyright notice and this permission notice shall be included in all
     * copies or substantial portions of the Software.
     *
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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    package dk.nsp.domain.repository

    import android.content.Context
    import androidx.lifecycle.LiveData
    import androidx.lifecycle.MutableLiveData
    import dk.nsp.api.getBackendApiLayer
    import dk.nsp.models.Observation
    import dk.nsp.models.ObservationTable
    import dk.nsp.models.ScanningObservationTable
    import dk.nsp.shared.*
    import dk.nsp.shared.util.asyncDefault
    import kotlinx.coroutines.CoroutineScope
    import kotlinx.coroutines.Deferred

    class ObservationsRepository(context: Context): ClearableRepository {
        private val observationsController = context.getBackendApiLayer().observationsController

        private val _observations: MutableLiveData<List<Observation>> = MutableLiveData()
        val observations: LiveData<List<Observation>> = _observations

        private val _clinicalObservations: MutableLiveData<ObservationTable> = MutableLiveData()

        private val _scanObservations: MutableLiveData<ScanningObservationTable> = MutableLiveData()

        fun getObservationsAsync(
            scope: CoroutineScope,
            episodeOfCareIdentifier: String
        ): Deferred<ResultWrapper<List<Observation>>> =
            scope.asyncDefault {
                if (_observations.value == null) {
                    val observationsRes =
                        observationsController.getObservations(this, episodeOfCareIdentifier).await()

                    observationsRes.mapSuccess {
                        val observationsDomain = it

                        _observations.postValue(observationsDomain)

                        observationsDomain
                    }
                } else {
                    _observations.value?.let { Success(it) }
                        ?: Failed(Exception("No observation value at the time"))
                }
            }

        fun getClinicalObservationsAsync(
            scope: CoroutineScope,
            episodeOfCareIdentifier: String
        ): Deferred<ResultWrapper<ObservationTable>> =
            scope.asyncDefault {

                val cachedData = _clinicalObservations.value

                cachedData?.toSuccess()
                    ?: observationsController.getClinicalObservationsTable(scope, episodeOfCareIdentifier)
                        .await()
            }

        fun getScanObservationsTable(scope: CoroutineScope, episodeOfCareIdentifier: String): Deferred<ResultWrapper<ScanningObservationTable>> = scope.asyncDefault {
            val cachedData = _scanObservations.value

            cachedData?.toSuccess()
                ?: observationsController.getScanObservationsTable(scope, episodeOfCareIdentifier).await()
        }

        override fun clear() {
            _observations.value = null
            _clinicalObservations.value = null
            _scanObservations.value = null
        }
    }