#!/usr/bin/env python3
import os
from datetime import datetime
from configparser import ConfigParser
from starlette.routing import Route, Router
from starlette.responses import PlainTextResponse, JSONResponse
from starlette.exceptions import HTTPException
from pprint import pprint
import uvicorn
import json

# pyHeatpump modules
from pyheatpump.models.variable import Variable
from pyheatpump.models.variable_type import VariableType
from pyheatpump.models.variable_value import VariableValue


async def get_variable_values(request):
    return JSONResponse({})


async def set_variable_values(request):
    raise NotImplementedError


async def get_variable_value(type: str, address: int, time: str=None):
    try:
        args = {
            'type': type,
            'address': address,
            'time': time
        }
        if time is None:
            args.pop('time')
        else:
            args['time'] = datetime.fromisoformat(time)

        row = VariableValue.get(**args)

        return PlainTextResponse(str(row.value))
    except StopIteration:
        raise HTTPException(404)


async def set_variable_value(request):
    raise NotImplementedError


async def variable_values_routes(request, *args, **kwargs):
    if request['method'] == 'GET':
        return await get_variable_values(request)
    elif request['method'] == 'POST':
        return await set_variable_values(request)

async def variable_value_routes(request, *args, **kwargs):
    if request['method'] == 'GET':
        if 'type' not in request.path_params.keys():
            raise HTTPException(422)
        if 'address' not in request.path_params.keys():
            raise HTTPException(422)
        if 'time' not in request.path_params.keys():
            return await get_variable_value(
                request.path_params['type'],
                request.path_params['address'])
        return await get_variable_value(
            request.path_params['type'],
            request.path_params['address'],
            request.path_params['time'])

    elif request['method'] == 'POST':
        return await set_variable_value(request *args, **kwargs)


ROUTES=[
    Route('/', variable_values_routes, methods=['GET', 'POST']),
    Route('/{type:str}/{address:int}', variable_value_routes, methods=['GET', 'POST']),
    Route('/{type:str}/{address:int}/{time:str}', variable_value_routes, methods=['GET'])
]

app = Router(routes=ROUTES)

if __name__ == '__main__':
    uvicorn.run('pyHeatpump:variable_values.app',
        host='127.0.0.1',
        port=8000)