# Import necessary objects
from flask import Flask, jsonify, request

# Initialize app
app = Flask(__name__)

# Existing todos
todos = {}


# Post, GET requests
@app.route("/todo", methods=["GET", "POST"])
def todo():
    if request.method == "POST":

        try:
            new_id = max(todos.keys()) + 1  # Generate new ID
        except ValueError:  # todos is empty
            new_id = 0

        try:
            todos[new_id] = request.json["todo"]  # Put todo in dict
        except KeyError:
            resp = jsonify({"status": "error", "error": "missing key 'todo'"})
            resp.status_code = 400
            return resp
            # Exception error

        return jsonify({"Status": "Created", "id": new_id})  # Return status of task with ID

    elif request.method == "GET":
        try:
            return jsonify(todos)  # Get all todos and post todo to an existing list
        except ValueError: # invalid json
            jsonify({"Status": "failed to jsonify todos"})  # KeyError Exception


# DELETE, GET requests
@app.route("/todo/<int:id_>", methods=["GET", "DELETE"])
def single_todo(id_):
    if request.method == "DELETE":
        try:
            del todos[id_]  # Deletes a single todo by ID
            return jsonify({"Status": "Deleted"})  # Return status of item
        except Exception:
            return jsonify({"Status": "Item does not exist"})  # KeyError Exception

    elif request.method == "GET":
        try:
            return jsonify({id_: todos[id_]})
        except Exception:
            return jsonify({"Status": "Item does not exist"})  # KeyError Exception


# Run app
if __name__ == "__main__":
    app.run(port=5000, debug=True)