database: initial commit

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

database/src/commonMain/kotlin/dev/msfjarvis/lobsters/data/local/Database.kt

@@ -0,0 +1,18 @@
+package dev.msfjarvis.lobsters.data.local
+
+import com.squareup.sqldelight.db.SqlDriver
+import dev.msfjarvis.lobsters.data.model.TagsAdapter
+import dev.msfjarvis.lobsters.database.LobstersDatabase
+
+internal const val LobstersDatabaseName = "SavedPosts.db"
+
+expect class DriverFactory {
+  fun createDriver(): SqlDriver
+}
+
+private fun getTagsAdapter() = TagsAdapter()
+
+fun createDatabase(driverFactory: DriverFactory): LobstersDatabase {
+  val driver = driverFactory.createDriver()
+  return LobstersDatabase(driver, SavedPost.Adapter(getTagsAdapter()))
+}

database/src/commonMain/kotlin/dev/msfjarvis/lobsters/data/model/TagsAdapter.kt

@@ -0,0 +1,17 @@
+package dev.msfjarvis.lobsters.data.model
+
+import com.squareup.sqldelight.ColumnAdapter
+
+class TagsAdapter : ColumnAdapter<List<String>, String> {
+  override fun decode(databaseValue: String): List<String> {
+    return databaseValue.split(SEPARATOR)
+  }
+
+  override fun encode(value: List<String>): String {
+    return value.joinToString(SEPARATOR)
+  }
+
+  private companion object {
+    private const val SEPARATOR = ","
+  }
+}

database/src/commonMain/sqldelight/dev/msfjarvis/lobsters/data/local/SavedPost.sq

@@ -0,0 +1,39 @@
+import kotlin.collections.List;
+
+CREATE TABLE IF NOT EXISTS SavedPost(
+  shortId TEXT NOT NULL PRIMARY KEY,
+  title TEXT NOT NULL,
+  url TEXT NOT NULL,
+  createdAt TEXT NOT NULL,
+  commentsUrl TEXT NOT NULL,
+  submitterName TEXT NOT NULL,
+  submitterAvatarUrl TEXT NOT NULL,
+  tags TEXT AS List<String> NOT NULL
+);
+
+insertOrReplacePost:
+INSERT OR REPLACE
+INTO SavedPost
+VALUES ?;
+
+selectAllPosts:
+SELECT *
+FROM SavedPost;
+
+selectCount:
+SELECT COUNT(*)
+FROM SavedPost;
+
+deleteAllPosts:
+DELETE
+FROM SavedPost;
+
+deletePost:
+DELETE
+FROM SavedPost
+WHERE shortId = ?;
+
+selectPost:
+SELECT *
+FROM SavedPost
+WHERE shortId = ?;