import os
import psycopg2
from flask import Flask, jsonify, request, abort

app = Flask(__name__)

def get_conn():
    return psycopg2.connect(os.environ["DATABASE_URL"])

@app.route("/api/notes", methods=["GET"])
def get_notes():
    with get_conn() as conn, conn.cursor() as cur:
        cur.execute("SELECT id, content, created_at FROM notes ORDER BY created_at DESC")
        rows = cur.fetchall()
    return jsonify([{"id": r[0], "content": r[1], "created_at": r[2].isoformat()} for r in rows])

@app.route("/api/notes", methods=["POST"])
def add_note():
    data = request.get_json()
    content = (data or {}).get("content", "").strip()
    if not content:
        abort(400, "content required")
    with get_conn() as conn, conn.cursor() as cur:
        cur.execute("INSERT INTO notes (content) VALUES (%s) RETURNING id, content, created_at", (content,))
        row = cur.fetchone()
        conn.commit()
    return jsonify({"id": row[0], "content": row[1], "created_at": row[2].isoformat()}), 201

@app.route("/api/notes/<int:note_id>", methods=["DELETE"])
def delete_note(note_id):
    with get_conn() as conn, conn.cursor() as cur:
        cur.execute("DELETE FROM notes WHERE id = %s", (note_id,))
        conn.commit()
    return "", 204

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)