/*
 * Copyright (C) 2024 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * ```
 *      http://www.apache.org/licenses/LICENSE-2.0
 * ```
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.android.healthconnect.controller.data.entries.api

import android.health.connect.datatypes.MedicalResource
import android.util.Log
import com.android.healthconnect.controller.data.entries.FormattedEntry
import com.android.healthconnect.controller.data.formatters.medical.MedicalEntryFormatter
import com.android.healthconnect.controller.permissions.data.MedicalPermissionType
import com.android.healthconnect.controller.shared.usecase.BaseUseCase
import com.android.healthconnect.controller.shared.usecase.IoDispatcher
import com.android.healthconnect.controller.shared.usecase.UseCaseResults
import javax.inject.Inject
import javax.inject.Singleton
import kotlinx.coroutines.CoroutineDispatcher

/** Use case to load medical data type entries. */
@Singleton
class LoadMedicalEntriesUseCase
@Inject
constructor(
    @IoDispatcher private val dispatcher: CoroutineDispatcher,
    private val medicalEntryFormatter: MedicalEntryFormatter,
    private val loadEntriesHelper: LoadEntriesHelper,
) :
    BaseUseCase<LoadMedicalEntriesInput, List<FormattedEntry>>(dispatcher),
    ILoadMedicalEntriesUseCase {

    companion object {
        private const val TAG = "LoadMedicalEntriesUseCase"
    }

    override suspend fun execute(input: LoadMedicalEntriesInput): List<FormattedEntry> {
        val medicalResources = loadEntriesHelper.readMedicalRecords(input)
        return medicalResources.mapNotNull { getFormatterResource(it, input.showDataOrigin) }
    }

    private suspend fun getFormatterResource(
        resource: MedicalResource,
        showDataOrigin: Boolean,
    ): FormattedEntry.FormattedMedicalDataEntry? {
        return try {
            medicalEntryFormatter.formatResource(resource, showDataOrigin)
        } catch (ex: Exception) {
            Log.i(TAG, "Failed to format medical resource!")
            null
        }
    }
}

data class LoadMedicalEntriesInput(
    val medicalPermissionType: MedicalPermissionType,
    val packageName: String?,
    val showDataOrigin: Boolean,
)

interface ILoadMedicalEntriesUseCase {
    suspend fun invoke(input: LoadMedicalEntriesInput): UseCaseResults<List<FormattedEntry>>

    suspend fun execute(input: LoadMedicalEntriesInput): List<FormattedEntry>
}