from django.http import HttpResponse
from model import models
import json
from datetime import datetime
import time


def response(content):
	result = HttpResponse(content)
	result["Access-Control-Allow-Origin"] = "*"
	result["Access-Control-Allow-Methods"] = "GET, POST, DELETE, OPTIONS"
	return result


def error(text):
	return response(json.dumps({'status': 'error','message': text}))


def doTheMagic(request):
	clientId = request.GET.get('client', '')

	if (clientId == ''):
		return error('Wrong client id')

	userId = request.GET.get('user', '')

	if (userId == ''):
		return error('Wrong user id')

	chartId = request.GET.get('chart', '')

	if request.method == 'OPTIONS':
		return respondToOptionsRequest(request.META)

	if request.method == 'GET':
		if chartId == '':
			return getAllUserCharts(clientId, userId)
		else:
			return getChartContent(clientId, userId, chartId)

	elif request.method == 'DELETE':
		if chartId == '':
			return error('Wrong chart id')
		else:
			return removeChart(clientId, userId, chartId)

	elif request.method == 'POST':
		chartName = request.POST.get('name')
		symbol = request.POST.get('symbol')
		resolution = request.POST.get('resolution')
		content = request.POST.get('content')
		if chartId == '':
			return saveChart(clientId, userId, chartName, symbol, resolution, content)
		else:
			return rewriteChart(clientId, userId, chartId, chartName, symbol, resolution, content)

	else:
		return error('Wrong request')


def respondToOptionsRequest(requestHeaders):
	result = response(json.dumps({'status': "ok"}))
	result["Access-Control-Allow-Headers"] = requestHeaders["HTTP_ACCESS_CONTROL_REQUEST_HEADERS"]
	return result


def getAllUserCharts(clientId, userId):
	chartsList = models.Chart.objects.filter(ownerSource = clientId, ownerId = userId)
	result = map(lambda x : {'id': x.id, 'name': x.name, 'timestamp': time.mktime(x.lastModified.timetuple()), 'symbol': x.symbol, 'resolution': x.resolution} , chartsList)
	return response(json.dumps({'status': "ok", 'data': list(result)}))


def getChartContent(clientId, userId, chartId):
	try:
		chart = models.Chart.objects.get(ownerSource = clientId, ownerId = userId, id = chartId)
		result = json.dumps({'status': 'ok', 'data': { 'id': chart.id, 'name': chart.name, 'timestamp': time.mktime(chart.lastModified.timetuple()), 'content': chart.content}})
		return response(result)
	except:
		return error('Chart not found')


def removeChart(clientId, userId, chartId):
	try:
		chart = models.Chart.objects.get(ownerSource = clientId, ownerId = userId, id = chartId)
		chart.delete()
		return response(json.dumps({'status': 'ok'}))
	except:
		return error('Chart not found')


def saveChart(clientId, userId, chartName, symbol, resolution, content):
	newChart = models.Chart(
		ownerSource = clientId,
		ownerId = userId,
		name = chartName,
		content = content,
		lastModified = datetime.now(),
		symbol = symbol,
		resolution = resolution
	)

	newChart.save()
	return response(json.dumps({'status': 'ok', 'id': newChart.id}))


def rewriteChart(clientId, userId, chartId, chartName, symbol, resolution, content):
	try:
		chart = models.Chart.objects.get(ownerSource = clientId, ownerId = userId, id = chartId)
		chart.lastModified = datetime.utcnow()
		chart.content = content
		chart.name = chartName
		chart.symbol = symbol
		chart.resolution = resolution

		chart.save()
		return response(json.dumps({'status': 'ok'}))
	except:
		return error('Chart not found')