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app/routes.py

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+from flask import Flask, render_template, request, redirect, url_for
+from . import db
+from .models import Task
+from flask import current_app as app 
+
+
+@app.route("/")
+def index():
+    tasks = Task.query.all()
+    return render_template("index.html", tasks=tasks)
+
+@app.route("/add", methods=["POST"])
+def add_task():
+    title = request.form.get("title")
+    if title:
+        new_task = Task(title=title)
+        db.session.add(new_task)
+        db.session.commit()
+    return redirect(url_for("index"))
+
+@app.route("/delete/<int:task_id>")
+def delete_task(task_id):
+    task = Task.query.get_or_404(task_id)
+    db.session.delete(task)
+    db.session.commit()
+    return redirect(url_for("index"))
+
+@app.route("/complete/<int:task_id>")
+def complete_task(task_id):
+    task = Task.query.get_or_404(task_id)
+    task.completed = not task.completed
+    db.session.commit()
+    return redirect(url_for("index"))
+