Find notes by tags in notes list

app/src/main/kotlin/controllers/NoteController.kt

@@ -46,8 +46,9 @@ class NoteController(
 
     fun list(request: Request, jwtPayload: JwtPayload): Response {
         val currentPage = request.query("page")?.toIntOrNull()?.let(::abs) ?: 1
-        val (pages, notes) = noteService.paginatedNotes(jwtPayload.userId, currentPage)
-        return Response(OK).html(view.notes(jwtPayload, notes, currentPage, pages))
+        val tag = request.query("tag")
+        val (pages, notes) = noteService.paginatedNotes(jwtPayload.userId, currentPage, tag = tag)
+        return Response(OK).html(view.notes(jwtPayload, notes, currentPage, pages, tag = tag))
     }
 
     fun note(request: Request, jwtPayload: JwtPayload): Response {

app/src/main/kotlin/views/NoteView.kt

@@ -48,7 +48,13 @@ class NoteView(staticFileResolver: StaticFileResolver) : View(staticFileResolver
         }
     }
 
-    fun notes(jwtPayload: JwtPayload, notes: List<PersistedNoteMetadata>, currentPage: Int, numberOfPages: Int) =
+    fun notes(
+        jwtPayload: JwtPayload,
+        notes: List<PersistedNoteMetadata>,
+        currentPage: Int,
+        numberOfPages: Int,
+        tag: String?
+    ) =
         renderPage(title = "Notes", jwtPayload = jwtPayload) {
             div("container mx-auto p-4") {
                 div("flex justify-between mb-4") {
@@ -66,25 +72,29 @@ class NoteView(staticFileResolver: StaticFileResolver) : View(staticFileResolver
                                 a(classes = "text-blue-200 text-xl hover:underline", href = "/notes/$uuid") {
                                     +title
                                 }
-                                span {
+                                span("space-x-2") {
                                     tags.forEach {
-                                        span("tag ml-2") { +"#$it" }
+                                        a(href = "?tag=$it", classes = "tag") {
+                                            span { +"#$it" }
+                                        }
                                     }
                                 }
                             }
                         }
                     }
                     if (numberOfPages > 1)
-                        pagination(currentPage, numberOfPages)
+                        pagination(currentPage, numberOfPages, tag)
                 } else
                     span { +"No notes yet" } // FIXME if too far in pagination, it it displayed
             }
         }
 
-    private fun DIV.pagination(currentPage: Int, numberOfPages: Int) {
+    private fun DIV.pagination(currentPage: Int, numberOfPages: Int, tag: String?) {
         val links = mutableListOf<Pair<String, String>>()
         // if (currentPage > 1) links += "Previous" to "?page=${currentPage - 1}"
-        links += (1..numberOfPages).map { "$it" to "?page=$it" }
+        links += (1..numberOfPages).map { page ->
+            "$page" to (tag?.let { "?page=$page&tag=$it" } ?: "?page=$page")
+        }
         // if (currentPage < numberOfPages) links += "Next" to "?page=${currentPage + 1}"
 
         nav("pages") {

domain/src/main/kotlin/usecases/NoteService.kt

@@ -29,11 +29,11 @@ class NoteService(
             .map { Note(it.metadata, markdown = markdownText, html = it.html) }
             .map { noteRepository.update(userId, uuid, it) }
 
-    fun paginatedNotes(userId: Int, page: Int, itemsPerPage: Int = 20): PaginatedNotes {
-        val count = noteRepository.count(userId)
+    fun paginatedNotes(userId: Int, page: Int, itemsPerPage: Int = 20, tag: String? = null): PaginatedNotes {
+        val count = noteRepository.count(userId, tag)
         val offset = (page - 1) * itemsPerPage
         val numberOfPages = (count / itemsPerPage) + 1
-        val notes = if (count == 0) emptyList() else noteRepository.findAll(userId, itemsPerPage, offset)
+        val notes = if (count == 0) emptyList() else noteRepository.findAll(userId, itemsPerPage, offset, tag)
         return PaginatedNotes(numberOfPages, notes)
     }
 

domain/src/main/kotlin/usecases/repositories/NoteRepository.kt

@@ -13,5 +13,5 @@ interface NoteRepository {
     fun update(userId: Int, uuid: UUID, note: Note): PersistedNote?
     fun delete(userId: Int, uuid: UUID): Boolean
     fun getTags(userId: Int): List<String>
-    fun count(userId: Int): Int
+    fun count(userId: Int, tag: String? = null): Int
 }

persistance/src/main/kotlin/notes/NoteRepositoryImpl.kt

@@ -132,5 +132,9 @@ internal class NoteRepositoryImpl(private val db: Database) : NoteRepository {
             .mapColumns(isDistinct = true) { it.name } as List<String>
     }
 
-    override fun count(userId: Int) = db.notes.count { it.userId eq userId }
+    override fun count(userId: Int, tag: String?): Int {
+        if (tag == null) return db.notes.count { it.userId eq userId }
+        return db.sequenceOf(Tags)
+            .count { it.name eq tag and (it.note.userId eq userId) }
+    }
 }