Re-implement answer buttons

proto/anki/scheduler.proto

@@ -291,12 +291,18 @@ message NextCardDataRequest {
 }
 
 message NextCardDataResponse {
+  message AnswerButton {
+    CardAnswer.Rating rating = 1;
+    string due = 2;
+  }
+
   message NextCardData {
     int64 card_id = 1;
     string front = 2;
     string back = 3;
 
     SchedulingStates states = 4;
+    repeated AnswerButton answer_buttons = 5;
   }
 
   optional NextCardData next_card = 1;

rslib/src/scheduler/service/mod.rs

@@ -7,6 +7,7 @@ mod states;
 use anki_proto::cards;
 use anki_proto::generic;
 use anki_proto::scheduler;
+use anki_proto::scheduler::next_card_data_response::AnswerButton;
 use anki_proto::scheduler::next_card_data_response::NextCardData;
 use anki_proto::scheduler::ComputeFsrsParamsResponse;
 use anki_proto::scheduler::ComputeMemoryStateResponse;
@@ -398,6 +399,16 @@ impl crate::services::SchedulerService for Collection {
             let render = self.render_existing_card(cid, false, false)?;
             let style = format!("<style>{}</style>", render.css);
 
+            let answer_buttons = self
+                .describe_next_states(&next_card.states)?
+                .into_iter()
+                .enumerate()
+                .map(|(i, due)| AnswerButton {
+                    rating: i as i32,
+                    due,
+                })
+                .collect();
+
             Ok(NextCardDataResponse {
                 next_card: Some(NextCardData {
                     card_id: cid.0,
@@ -405,6 +416,7 @@ impl crate::services::SchedulerService for Collection {
                     back: [style, render.answer().to_string()].concat(),
 
                     states: Some(next_card.states.clone().into()),
+                    answer_buttons,
                 }),
             })
         } else {

ts/routes/reviewer/+page.svelte

@@ -7,7 +7,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     import ReviewerBottom from "./reviewer-bottom/ReviewerBottom.svelte";
     import Reviewer from "./Reviewer.svelte";
 
-    let state = new ReviewerState
+    const state = new ReviewerState();
 </script>
 
 <div>

ts/routes/reviewer/Reviewer.svelte

@@ -5,12 +5,12 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 <script lang="ts">
     import type { ReviewerState } from "./reviewer";
 
-
     let iframe: HTMLIFrameElement;
-    export let state: ReviewerState
-
-    $: if (iframe) state.registerIFrame(iframe)
+    export let state: ReviewerState;
 
+    $: if (iframe) {
+        state.registerIFrame(iframe);
+    }
 </script>
 
 <div id="qa">

ts/routes/reviewer/reviewer-bottom/AnswerButton.svelte

@@ -3,10 +3,16 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
-    import { bridgeCommand } from "@tslib/bridgecommand";
-    import type { AnswerButtonInfo } from "./types";
+    import type { NextCardDataResponse_AnswerButton } from "@generated/anki/scheduler_pb";
+    import * as tr from "@generated/ftl";
+    import type { ReviewerState } from "../reviewer";
+
+    export let info: NextCardDataResponse_AnswerButton;
+    export let state: ReviewerState;
+
+    const labels = [tr.studyingAgain(), tr.studyingHard(), tr.studyingGood(), tr.studyingEasy()]
+    $: label = labels[info.rating];
 
-    export let info: AnswerButtonInfo;
 </script>
 
 <span>
@@ -16,8 +22,8 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         &nbsp;
     {/if}
 </span>
-<button on:click={() => bridgeCommand(`ease${info.i}`)}>
-    {info.label}
+<button on:click={() => state.easeButtonPressed(info.rating)}>
+    {label}
 </button>
 
 <style>

ts/routes/reviewer/reviewer-bottom/ReviewerBottom.svelte

@@ -3,6 +3,8 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
+    import "./index.scss";
+
     import AnswerButton from "./AnswerButton.svelte";
     import { bridgeCommand } from "@tslib/bridgecommand";
     import * as tr from "@generated/ftl";
@@ -10,18 +12,20 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     import type { ReviewerState } from "../reviewer";
     import { writable } from "svelte/store";
 
-    export let state: ReviewerState
+    export let state: ReviewerState;
 
+    const answerButtons = state.answerButtons;
+    const answerShown = state.answerShown;
     // Placeholders
-    let answerButtons = writable([]);
-    let remaining = writable([0, 0, 0]);
-    let remainingIndex = writable(0);
+    const remaining = writable([0, 0, 0]);
+    const remainingIndex = writable(0);
+
+    $: button_count = $answerShown ? $answerButtons.length : 1;
 
-    $: answerShown = $answerButtons.length;
 </script>
 
 <div id="outer" class="fancy">
-    <div id="tableinner" style="--answer-button-count: {$answerButtons.length || 1}">
+    <div id="tableinner" style="--answer-button-count: {button_count}">
         <span class="disappearing"></span>
         <div class="disappearing edit">
             <button
@@ -31,9 +35,9 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
                 {tr.studyingEdit()}
             </button>
         </div>
-        {#if answerShown}
+        {#if $answerShown}
             {#each $answerButtons as answerButton}
-                <AnswerButton info={answerButton}></AnswerButton>
+                <AnswerButton {state} info={answerButton}></AnswerButton>
             {/each}
         {:else}
             <span class="remaining-count">

ts/routes/reviewer/reviewer.ts

@@ -1,17 +1,16 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
-import {
-    CardAnswer,
-    type NextCardDataResponse_NextCardData,
-} from "@generated/anki/scheduler_pb";
+import { CardAnswer, NextCardDataResponse_AnswerButton, type NextCardDataResponse_NextCardData } from "@generated/anki/scheduler_pb";
 import { nextCardData } from "@generated/backend";
 import { writable } from "svelte/store";
 
 export class ReviewerState {
-    answerHtml: string = ""
+    answerHtml = "";
     cardData: NextCardDataResponse_NextCardData | undefined = undefined;
     beginAnsweringMs = Date.now();
     readonly cardClass = writable("");
+    readonly answerButtons = writable<NextCardDataResponse_AnswerButton[]>([]);
+    readonly answerShown = writable(false)
 
     iframe: HTMLIFrameElement | undefined = undefined;
 
@@ -34,19 +33,22 @@ export class ReviewerState {
             answer: answer || undefined,
         });
         // TODO: "Congratulation screen" logic
-        this.cardData = resp.nextCard
+        this.cardData = resp.nextCard;
+        this.answerButtons.set(this.cardData?.answerButtons ?? []);
         const question = resp.nextCard?.front || "";
+        this.answerShown.set(false);
         this.updateHtml(question);
     }
 
     public showAnswer() {
+        this.answerShown.set(true);
         this.updateHtml(this.cardData?.back || "");
     }
 
     public easeButtonPressed(rating: number) {
         const states = this.cardData!.states!;
 
-        let newState = ({
+        const newState = ({
             [1]: states.again!,
             [2]: states.hard!,
             [3]: states.good!,