feat: enhance MemoCompleteList with task clearing functionality and integrate task extraction utility

web/src/components/MemoView/components/MemoCompleteList.tsx

@@ -1,19 +1,123 @@
 import { Button } from "@/components/ui/button";
-import { Switch } from "@/components/ui/switch";
+import { useMemoViewContext } from "../MemoViewContext";
+import { useCreateMemo, useDeleteMemo, useUpdateMemo } from "@/hooks/useMemoQueries";
+import { extractTasks } from "@/utils/markdown-manipulation";
+import { toast } from "react-hot-toast";
 
 function MemoCompleteList() {
+  const { memo } = useMemoViewContext();
+  const { mutate: updateMemo } = useUpdateMemo();
+  const { mutate: deleteMemo } = useDeleteMemo();
+  const { mutate: createMemo } = useCreateMemo();
+
+  // Parse tasks once per render for both counting and clearing
+  const tasks = extractTasks(memo.content);
+  const completedTasks = tasks.filter((task) => task.checked);
+  const completedCount = completedTasks.length;
+  const hasCompletedTasks = completedCount > 0;
+
+  const handleClearCompleted = () => {
+    if (!hasCompletedTasks) {
+      return;
+    }
+
+    const previousContent = memo.content;
+
+    // Remove completed task lines based on the precomputed task list
+    const lines = previousContent.split("\n");
+    const completedLines = completedTasks
+      .map((task) => task.lineNumber)
+      .sort((a, b) => b - a);
+
+    for (const lineNumber of completedLines) {
+      if (lineNumber >= 0 && lineNumber < lines.length) {
+        lines.splice(lineNumber, 1);
+      }
+    }
+
+    const newContent = lines.join("\n");
+    if (newContent === previousContent) {
+      return;
+    }
+
+    const isNowEmpty = newContent.trim().length === 0;
+
+    if (isNowEmpty) {
+      // Delete memo when clearing completed tasks leaves it empty
+      deleteMemo(memo.name);
+
+      toast.custom(
+        (t) => (
+          <div className="flex items-center gap-3 rounded-md border border-border bg-card px-4 py-2 text-sm text-foreground shadow-lg">
+            <span>{completedCount} completed items cleared and memo deleted. Undo?</span>
+            <Button
+              variant="outline"
+              size="sm"
+              onClick={() => {
+                // Recreate memo with original content
+                createMemo({
+                  ...memo,
+                  name: "",
+                  content: previousContent,
+                });
+                toast.dismiss(t.id);
+              }}
+            >
+              Undo
+            </Button>
+          </div>
+        ),
+        { position: "bottom-center" },
+      );
+    } else {
+      // Just update content when there is still other content
+      updateMemo({
+        update: {
+          name: memo.name,
+          content: newContent,
+        },
+        updateMask: ["content"],
+      });
+
+      toast.custom(
+        (t) => (
+          <div className="flex items-center gap-3 rounded-md border border-border bg-card px-4 py-2 text-sm text-foreground shadow-lg">
+            <span>{completedCount} completed items cleared. Undo?</span>
+            <Button
+              variant="outline"
+              size="sm"
+              onClick={() => {
+                updateMemo({
+                  update: {
+                    name: memo.name,
+                    content: previousContent,
+                  },
+                  updateMask: ["content"],
+                });
+                toast.dismiss(t.id);
+              }}
+            >
+              Undo
+            </Button>
+          </div>
+        ),
+        { position: "bottom-center" },
+      );
+    }
+  };
+
   return (
-    <section className="  flex items-center gap-3">
-        <div className=" flex items-center gap-2 ">
-            <span>Completed Task</span>
-        <Switch
-         defaultChecked
-         className="  [&>[data-slot=switch-thumb][data-state=unchecked]]:bg-mauve-400 [&>[data-slot=switch-thumb][data-state=checked]]:bg-white"
-         />
-         </div>
-        <Button  className=" not-hover:border-foreground not-hover:text-foreground bg-transparent border-2 transition-all ease-linear">Clear Completed</Button>
+    <section className="flex items-center gap-3">
+      <Button
+        type="button"
+        disabled={!hasCompletedTasks}
+        onClick={handleClearCompleted}
+        className="not-hover:border-foreground not-hover:text-foreground bg-transparent border-2 transition-all ease-linear"
+      >
+        Clear Completed
+      </Button>
     </section>
-  )
+  );
 }
 
-export default MemoCompleteList
+export default MemoCompleteList;

web/src/components/MemoView/components/MemoFooter.tsx

@@ -1,6 +1,12 @@
+import { useMemoViewContext } from "../MemoViewContext";
 import MemoCompleteList from "./MemoCompleteList";
 
 function MemoFooter() {
+    const { memo } = useMemoViewContext();
+    const hasTaskList = memo.property?.hasTaskList;
+     if (!hasTaskList) {
+    return null;
+  }
   return (
 <footer className=" w-full  mt-5 flex justify-end items-center">
     <MemoCompleteList/>