From 8fd2c0b5cf021c1566e533c997c2de4b91c8c4a5 Mon Sep 17 00:00:00 2001
From: mahlatseclayton <mahlatseclayton1@gmail.com>
Date: Wed, 29 Jul 2026 22:10:49 +0200
Subject: [PATCH] Database schema creation/data access layer/overdue
 calculation

---
 src/lib/db.ts    |  2 +-
 src/lib/tasks.ts | 68 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/lib/types.ts | 19 ++++++++++++++
 3 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100644 src/lib/tasks.ts
 create mode 100644 src/lib/types.ts

diff --git a/src/lib/db.ts b/src/lib/db.ts
index 48af1f0..0d458e9 100644
--- a/src/lib/db.ts
+++ b/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
     )
diff --git a/src/lib/tasks.ts b/src/lib/tasks.ts
new file mode 100644
index 0000000..bee4daf
--- /dev/null
+++ b/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);
+}
diff --git a/src/lib/types.ts b/src/lib/types.ts
new file mode 100644
index 0000000..78dd7f6
--- /dev/null
+++ b/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;
+}
\ No newline at end of file