#!/usr/bin/python3

from flask import request, send_from_directory
from flask_api import FlaskAPI
import RPi.GPIO as GPIO
import os

from xml_reader import Xml_reader
from interface_handler import Interface_handler

xml_reader = Xml_reader('XML/config.xml','XML/config.xsd')
interface_handler = Interface_handler(xml_reader)

device_names = xml_reader.get_device_names()

app = FlaskAPI(__name__)

@app.route('/', methods=["GET"])
def api_root():
    return {
           "device_url": request.url + "device/<device_name>",
             "device_url_POST": {"output": "<value>"}
                 }

@app.route('/XML', methods=["GET","POST"])
def xml_transfer():
    try:
        #return the current config.xml
        if request.method == "GET":
            return send_from_directory('XML','config.xml')

        # set a new config.xml
        if request.method == "POST":
            if 'config.xml' not in request.files:
                raise ReferenceError("no file part")
            file = request.files["config.xml"]
            if file.filename != 'config.xml':
                raise NameError("the file recieved does not have the filename config.xml")
            file.save('/tmp/aped_device/config.xml')
            #check config.xml against the XSD file
            if xml_reader.validate('/tmp/aped_device/config.xml','XML/config.xsd'):
                os.replace('XML/config.xml','XML/config_old.xml')
                os.replace('/tmp/aped_device/config.xml','XML/config.xml')
            else:
                SyntaxError('the config.xml has invalid content')
    except Exception as e:
        return {'error' : str(e)}
  
@app.route('/device/<device_name>/', methods=["GET", "POST"])
def api_leds_control(device_name):
    try:
        if request.method == "POST":
            response = interface_handler.write(device_name,request.data.get("output"))
            return {'output': response}
        return {'state': interface_handler.read(device_name)}
    except Exception as e:
        return {'error': str(e)}

if __name__ == "__main__":
    app.run(port=8080,host="0.0.0.0")