Major code refactoring

Main goals are:
1. Ability to use mocks in unit tests instead of
having to setup mock web server as if it was an
integration test.
2. Cache Retrofit services in memory
3. Make it easier to read
4. Use OptIn where possible instead of propagating
Experimental* annotations everywhere

app/src/main/java/gq/kirmanak/mealient/data/recipes/impl/RecipeRepoImpl.kt

@@ -12,7 +12,7 @@ import kotlinx.coroutines.CancellationException
 import timber.log.Timber
 import javax.inject.Inject
 
-@ExperimentalPagingApi
+@OptIn(ExperimentalPagingApi::class)
 class RecipeRepoImpl @Inject constructor(
     private val mediator: RecipesRemoteMediator,
     private val storage: RecipeStorage,

app/src/main/java/gq/kirmanak/mealient/data/recipes/impl/RecipesRemoteMediator.kt

@@ -11,7 +11,7 @@ import kotlinx.coroutines.CancellationException
 import timber.log.Timber
 import javax.inject.Inject
 
-@ExperimentalPagingApi
+@OptIn(ExperimentalPagingApi::class)
 class RecipesRemoteMediator @Inject constructor(
     private val storage: RecipeStorage,
     private val network: RecipeDataSource,

app/src/main/java/gq/kirmanak/mealient/data/recipes/network/RecipeDataSourceImpl.kt

@@ -1,50 +1,35 @@
 package gq.kirmanak.mealient.data.recipes.network
 
 import gq.kirmanak.mealient.data.auth.AuthRepo
-import gq.kirmanak.mealient.data.impl.RetrofitBuilder
+import gq.kirmanak.mealient.data.network.ServiceFactory
 import gq.kirmanak.mealient.data.recipes.network.response.GetRecipeResponse
 import gq.kirmanak.mealient.data.recipes.network.response.GetRecipeSummaryResponse
-import kotlinx.serialization.ExperimentalSerializationApi
 import timber.log.Timber
 import javax.inject.Inject
 
-@ExperimentalSerializationApi
 class RecipeDataSourceImpl @Inject constructor(
     private val authRepo: AuthRepo,
-    private val retrofitBuilder: RetrofitBuilder
+    private val recipeServiceFactory: ServiceFactory<RecipeService>,
 ) : RecipeDataSource {
-    private var _recipeService: RecipeService? = null
 
     override suspend fun requestRecipes(start: Int, limit: Int): List<GetRecipeSummaryResponse> {
         Timber.v("requestRecipes() called with: start = $start, limit = $limit")
-        val service: RecipeService = getRecipeService()
-        val recipeSummary = service.getRecipeSummary(start, limit)
+        val recipeSummary = getRecipeService().getRecipeSummary(start, limit, getToken())
         Timber.v("requestRecipes() returned: $recipeSummary")
         return recipeSummary
     }
 
     override suspend fun requestRecipeInfo(slug: String): GetRecipeResponse {
         Timber.v("requestRecipeInfo() called with: slug = $slug")
-        val service: RecipeService = getRecipeService()
-        val recipeInfo = service.getRecipe(slug)
+        val recipeInfo = getRecipeService().getRecipe(slug, getToken())
         Timber.v("requestRecipeInfo() returned: $recipeInfo")
         return recipeInfo
     }
 
     private suspend fun getRecipeService(): RecipeService {
         Timber.v("getRecipeService() called")
-        val cachedService: RecipeService? = _recipeService
-        val service: RecipeService = if (cachedService == null) {
-            val baseUrl = checkNotNull(authRepo.getBaseUrl()) { "Base url is null" }
-            val token = checkNotNull(authRepo.getToken()) { "Token is null" }
-            Timber.d("requestRecipes: baseUrl = $baseUrl, token = $token")
-            val retrofit = retrofitBuilder.buildRetrofit(baseUrl)
-            val createdService = retrofit.create(RecipeService::class.java)
-            _recipeService = createdService
-            createdService
-        } else {
-            cachedService
-        }
-        return service
+        return recipeServiceFactory.provideService(authRepo.requireBaseUrl())
     }
-}
+
+    private suspend fun getToken(): String = authRepo.requireAuthHeader()
+}

app/src/main/java/gq/kirmanak/mealient/data/recipes/network/RecipeService.kt

@@ -3,6 +3,7 @@ package gq.kirmanak.mealient.data.recipes.network
 import gq.kirmanak.mealient.data.recipes.network.response.GetRecipeResponse
 import gq.kirmanak.mealient.data.recipes.network.response.GetRecipeSummaryResponse
 import retrofit2.http.GET
+import retrofit2.http.Header
 import retrofit2.http.Path
 import retrofit2.http.Query
 
@@ -10,11 +11,13 @@ interface RecipeService {
     @GET("/api/recipes/summary")
     suspend fun getRecipeSummary(
         @Query("start") start: Int,
-        @Query("limit") limit: Int
+        @Query("limit") limit: Int,
+        @Header("Authorization") authHeader: String?,
     ): List<GetRecipeSummaryResponse>
 
     @GET("/api/recipes/{recipe_slug}")
     suspend fun getRecipe(
-        @Path("recipe_slug") recipeSlug: String
+        @Path("recipe_slug") recipeSlug: String,
+        @Header("Authorization") authHeader: String?,
     ): GetRecipeResponse
 }