start adding of ratings buttons

ratings/source/src/commonMain/kotlin/buttons/RootButtons.kt

@@ -0,0 +1,42 @@
+package dev.inmo.plaguposter.ratings.source.buttons
+
+import dev.inmo.micro_utils.pagination.FirstPagePagination
+import dev.inmo.micro_utils.pagination.Pagination
+import dev.inmo.micro_utils.pagination.isFirstPage
+import dev.inmo.micro_utils.pagination.utils.paginate
+import dev.inmo.plaguposter.ratings.repo.RatingsRepo
+import dev.inmo.plaguposter.ratings.utils.postsByRatings
+import dev.inmo.tgbotapi.extensions.utils.types.buttons.dataButton
+import dev.inmo.tgbotapi.extensions.utils.types.buttons.inlineKeyboard
+import dev.inmo.tgbotapi.types.buttons.inline.dataInlineButton
+import dev.inmo.tgbotapi.utils.row
+
+const val RootButtonsShowRatingData = "ratings_buttons_show"
+const val RootButtonsToPageData = "ratings_buttons_to_page"
+
+suspend fun RatingsRepo.buildRootButtons(
+    pagination: Pagination = FirstPagePagination(16),
+    rowSize: Int = 4
+) {
+    val postsByRatings = postsByRatings().toList().paginate(pagination)
+    inlineKeyboard {
+        if (postsByRatings.pagesNumber > 1) {
+            row {
+                if (postsByRatings.page > 0) {
+                    dataButton("<", "$RootButtonsToPageData ${postsByRatings.page - 1}")
+                }
+                dataButton("${postsByRatings.page}: \uD83D\uDD04", "$RootButtonsToPageData ${postsByRatings.page}")
+                if (postsByRatings.pagesNumber - postsByRatings.page > 1) {
+                    dataButton(">", "$RootButtonsToPageData ${postsByRatings.page + 1}")
+                }
+            }
+        }
+        postsByRatings.results.chunked(rowSize).map {
+            row {
+                it.forEach { (rating, posts) ->
+                    dataButton("${rating.double}: ${posts.size}", "$RootButtonsShowRatingData ${rating.double}")
+                }
+            }
+        }
+    }
+}