Database schema creation/data access layer/overdue calculation

src/lib/db.ts

@@ -11,7 +11,7 @@ db.exec(
     title TEXT NOT NULL,
     due_date TEXT NOT NULL,
     topic TEXT NOT NULL,
-    status TEXT CHECK(status IN ('To-Do','In-Progress','Completed')) NOT NULL DEFAULT 'to-do',
+    status TEXT CHECK(status IN ('To-Do','In-Progress','Complete')) NOT NULL DEFAULT 'to-do',
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     is_Archived BOOLEAN NOT NULL DEFAULT 0
     )

src/lib/tasks.ts

@@ -0,0 +1,68 @@
+import db from './db';
+import { Task, TaskStatus, computeIsOverdue } from './types';
+export function getTasks(sortBy: 'due_date' | 'topic' | 'status' = 'due_date'): Task[] {
+
+    const validSortColumns = ['due_date', 'topic', 'status'];
+    const sortColumn = validSortColumns.includes(sortBy) ? sortBy : 'due_date';
+
+    const sql = `SELECT * FROM tasks WHERE is_archived = 0 ORDER BY ${sortColumn} ASC`;
+    const tasks = db.prepare(sql).all() as Task[];
+
+    return tasks.map(task => ({
+        ...task,
+        is_overdue: computeIsOverdue(task.due_date, task.status)
+    }));
+}
+
+export function createTask(task: {
+    title: string;
+    description?: string;
+    due_date: string;
+    topic: string;
+    status?: TaskStatus;
+}) {
+    const stmt = db.prepare(`
+    INSERT INTO tasks (title, description, due_date, topic, status)
+    VALUES (?, ?, ?, ?, ?)
+  `);
+
+    return stmt.run(
+        task.title,
+        task.description || '',
+        task.due_date,
+        task.topic,
+        task.status || 'Todo'
+    );
+}
+
+
+export function updateTask(
+    id: number,
+    task: {
+        title: string;
+        description?: string;
+        due_date: string;
+        topic: string;
+        status: TaskStatus;
+    }
+) {
+    const stmt = db.prepare(`
+    UPDATE tasks
+    SET title = ?, description = ?, due_date = ?, topic = ?, status = ?
+    WHERE id = ?
+  `);
+
+    return stmt.run(
+        task.title,
+        task.description || '',
+        task.due_date,
+        task.topic,
+        task.status,
+        id
+    );
+}
+
+
+export function archiveTask(id: number) {
+    return db.prepare(`UPDATE tasks SET is_archived = 1 WHERE id = ?`).run(id);
+}

src/lib/types.ts

@@ -0,0 +1,19 @@
+export type TaskStatus = 'Todo' | 'In-Progress' | 'Complete';
+
+export interface Task {
+    id: number;
+    title: string;
+    description: string;
+    due_date: string; // ISO Format YYYY-MM-DD
+    topic: string;
+    status: TaskStatus;
+    is_archived: number; // 0 or 1
+    created_at: string;
+    is_overdue?: boolean; // Derived field
+}
+
+export function computeIsOverdue(dueDateStr: string, status: TaskStatus): boolean {
+    if (status === 'Complete') return false;
+    const today = new Date().toISOString().split('T')[0];
+    return dueDateStr < today;
+}