/*
 * Copyright (C) 2017 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.qimai.android.fetch.adapter

import androidx.lifecycle.LiveData
import com.qimai.android.fetch.Response.ApiResponse
import retrofit2.CallAdapter
import retrofit2.Retrofit
import java.lang.reflect.ParameterizedType
import java.lang.reflect.Type


class LiveDataCallAdapterFactory : CallAdapter.Factory() {
    override fun get(
        returnType: Type,
        annotations: Array<Annotation>,
        retrofit: Retrofit
    ): CallAdapter<*, *>? {
        if (getRawType(returnType) != LiveData::class.java) {
            return null
        }
        val observableType = getParameterUpperBound(0, returnType as ParameterizedType)
        val rawObservableType = getRawType(observableType)
        require(rawObservableType == ApiResponse::class.java) { "type must be a resource" }
        require(observableType is ParameterizedType) { "resource must be parameterized" }
        val bodyType = getParameterUpperBound(0, observableType)
        return LiveDataCallAdapter<Any>(bodyType)
    }
}
