#!/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
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(var_type: str, address: int, time: str=None):
    try:
        args = {
            'var_type': var_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.get_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)
    raise NotImplementedError

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)