Add support for rich item previews

service-api/src/commonMain/kotlin/catchup/service/api/CatchUpItem.kt

@@ -42,6 +42,7 @@ data class CatchUpItem(
   val serviceId: String? = null,
   val indexInResponse: Int? = null,
   val contentType: ContentType? = null, // Null indicates unset, try to infer it
+  val imagePreviewUrl: String? = null,
 ) {
 
   val clickUrl: String?
@@ -99,6 +100,7 @@ data class CatchUpItem(
         serviceId = serviceId,
         indexInResponse = index,
         contentType = HTML,
+        imagePreviewUrl = "https://picsum.photos/seed/$index/300/300",
       )
     }
   }

service-api/src/commonMain/kotlin/catchup/service/api/DbMapping.kt

@@ -20,6 +20,7 @@ fun CatchUpItem.toCatchUpDbItem(): CatchUpDbItem {
     serviceId = serviceId,
     indexInResponse = indexInResponse,
     contentType = contentType?.name,
+    imagePreviewUrl = imagePreviewUrl,
     imageUrl = imageInfo?.url,
     imageDetailUrl = imageInfo?.detailUrl,
     imageAnimatable = imageInfo?.animatable,
@@ -55,6 +56,7 @@ fun CatchUpDbItem.toCatchUpItem(): CatchUpItem {
     serviceId = serviceId,
     indexInResponse = indexInResponse,
     contentType = contentType?.let { ContentType.valueOf(it) },
+    imagePreviewUrl = imagePreviewUrl,
     imageInfo =
       imageUrl?.let {
         ImageInfo(

service-api/src/commonMain/kotlin/catchup/service/api/ServiceMeta.kt

@@ -30,6 +30,7 @@ data class ServiceMeta(
   val firstPageKey: Int?,
   val pagesAreNumeric: Boolean = false,
   val enabled: Boolean = true,
+  val supportsRichTextItems: Boolean = false,
 ) {
   val enabledPreferenceKey = "service_config_${id}_enabled"
 }

service-db/src/commonMain/sqldelight/catchup/service/db/service.sq

@@ -22,6 +22,7 @@ CREATE TABLE IF NOT EXISTS catchUpDbItem (
   serviceId TEXT,
   indexInResponse INTEGER AS Int,
   contentType TEXT,
+  imagePreviewUrl TEXT,
 --   Image info
   imageUrl TEXT,
   imageDetailUrl TEXT,
@@ -83,6 +84,7 @@ INSERT OR REPLACE INTO catchUpDbItem (
   serviceId,
   indexInResponse,
   contentType,
+  imagePreviewUrl,
   imageUrl,
   imageDetailUrl,
   imageAnimatable,

services/producthunt/src/main/kotlin/catchup/service/producthunt/ProductHuntService.kt

@@ -116,6 +116,7 @@ class ProductHuntService(
             indexInResponse = index + request.pageOffset,
             serviceId = meta().id,
             contentType = ContentType.HTML,
+            imagePreviewUrl = thumbnail?.url,
           )
         }
       }

services/reddit/src/main/kotlin/catchup/service/reddit/RedditService.kt

@@ -87,6 +87,7 @@ class RedditService(@InternalApi private val serviceMeta: ServiceMeta, private v
             // If it's a selftext, mark it as HTML for summarizing.
             contentType = if (link.isSelf) ContentType.HTML else null,
             detailKey = link.id,
+            imagePreviewUrl = link.getPreviewUrl(),
           )
         }
       DataResult(data, redditListingRedditResponse.data.after)
@@ -163,6 +164,7 @@ interface RedditMetaModule {
         R.color.catchup_service_reddit_accent,
         R.drawable.catchup_service_reddit_logo,
         firstPageKey = null,
+        supportsRichTextItems = true,
       )
   }
 }

services/reddit/src/main/kotlin/catchup/service/reddit/model/RedditObject.kt

@@ -18,6 +18,7 @@ package catchup.service.reddit.model
 import androidx.annotation.Keep
 import com.squareup.moshi.Json
 import com.squareup.moshi.JsonClass
+import kotlin.math.abs
 import kotlin.time.Instant
 
 @Keep @JsonClass(generateAdapter = false) sealed interface RedditObject
@@ -83,7 +84,8 @@ data class RedditLink(
   val selftext: String?,
   @Json(name = "selftext_html") val selftextHtml: String?,
   val stickied: Boolean,
-  val thumbnail: String,
+  val thumbnail: String?,
+  val preview: RedditPreview?,
   val title: String,
   val url: String,
   val visited: Boolean,
@@ -102,7 +104,18 @@ data class RedditLink(
   override val score: Int,
   override val subreddit: String,
   override val ups: Int,
-) : RedditObject, RedditSubmission
+) : RedditObject, RedditSubmission {
+  fun getPreviewUrl(preferredWidthPx: Int = Int.MAX_VALUE): String? {
+    if (preview == null) return null
+    if (!preview.enabled) return null
+    if (preview.images.isEmpty()) return null
+    preview.images.firstOrNull()?.resolutions?.let { resolutions ->
+      val bestFit = resolutions.minByOrNull { abs(it.width - preferredWidthPx) }
+      return bestFit?.url
+    }
+    return thumbnail?.takeUnless(String::isBlank)
+  }
+}
 
 @Keep
 @JsonClass(generateAdapter = true)
@@ -140,3 +153,13 @@ data class RedditMore(
   val depth: Int,
   val children: List<String>,
 ) : RedditObject
+
+@Keep
+@JsonClass(generateAdapter = true)
+data class RedditPreview(val images: List<RedditImage>, val enabled: Boolean) : RedditObject {
+  @JsonClass(generateAdapter = true)
+  data class RedditImage(val source: RedditImageSource, val resolutions: List<RedditImageSource>) {
+    @JsonClass(generateAdapter = true)
+    data class RedditImageSource(val url: String, val width: Int, val height: Int)
+  }
+}