"""Client utilities for accessing NILM database via HTTP"""

from __future__ import absolute_import
import nilmdb
from nilmdb.printf import *

import time
import sys
import re
import os
import json
import urlparse
import urllib2
from urllib2 import urlopen, HTTPError
import pycurl

class ClientError(Exception):
    def __init__(self, code, message):
        Exception.__init__(self, message)
        self.code = code
    def __str__(self):
        return sprintf("[%03d] %s", self.code, self.message)

class MyCurl(object):
    def __init__(self, baseurl = ""):
        """If baseurl is supplied, all other functions that take
        a URL can be given a relative URL instead."""
        self.baseurl = baseurl
        self.curl = pycurl.Curl()
        self.curl.setopt(pycurl.SSL_VERIFYHOST, 2)
        self.curl.setopt(pycurl.FOLLOWLOCATION, 1)
        self.curl.setopt(pycurl.MAXREDIRS, 5)

    def _setup_url(self, url, params):
        url = urlparse.urljoin(self.baseurl, url)
        if params:
            url = urlparse.urljoin(url, "?" + urllib.urlencode(params, True))
        self.curl.setopt(pycurl.URL, url)
        return url
        
    def getjson(self, url, params = None):
        """Simple GET that returns JSON string"""
        self._setup_url(url, params)
        self._body = ""
        def body_callback(x):
            self._body += x
        self.curl.setopt(pycurl.WRITEFUNCTION, body_callback)
        try:
            self.curl.perform()
        except pycurl.error as e:
            raise ClientError(500, e[1])
        code = self.curl.getinfo(pycurl.RESPONSE_CODE)
        if code != 200:
            raise ClientError(code, "HTTP error")
        return json.loads(self._body)

class Client(object):
    def __init__(self, url):
        self.curl = MyCurl(url)

    def version(self):
        return self.curl.getjson("version")

    def stream_list(self, path = None, layout = None):
        params = {}
        if path is not None:
            params["path"] = path
        if layout is not None:
            params["layout"] = layout
        return self.curl.getjson("stream/list", params)

    def stream_get_metadata(self, path, keys = None):
        params = { "path": path }
        if keys is not None:
            params["key"] = keys
        return self.curl.getjson("stream/get_metadata", params)

    def stream_set_metadata(self):
        raise NotImplementedError

    def stream_update_metadata(self):
        raise NotImplementedError

    def stream_create(self):
        raise NotImplementedError

    def stream_insert(self, path):
        params = { "path": path }
        return self.curl.getjson("stream/insert", params)

        # eq_(db.stream_list(), [])

        # # Bad path
        # with assert_raises(ValueError):
        #     db.stream_create("foo/bar/baz", "PrepData")
        # with assert_raises(ValueError):
        #     db.stream_create("/foo", "PrepData")
        # # Bad layout type
        # with assert_raises(KeyError):
        #     db.stream_create("/newton/prep", "NoSuchLayout")
        # # Bad index columns
        # with assert_raises(KeyError):
        #     db.stream_create("/newton/prep", "PrepData", ["nonexistant"])
        # db.stream_create("/newton/prep", "PrepData")
        # db.stream_create("/newton/raw", "RawData")
        # db.stream_create("/newton/zzz/rawnotch", "RawNotchedData")

        # # Verify we got 3 streams
        # eq_(db.stream_list(), [ ("/newton/prep", "PrepData"),
        #                         ("/newton/raw", "RawData"),
        #                         ("/newton/zzz/rawnotch", "RawNotchedData")
        #                         ])
        # # Match just one type
        # eq_(db.stream_list(layout="RawData"), [ ("/newton/raw", "RawData") ])

        # # Verify that columns were made right
        # eq_(len(db.h5file.getNode("/newton/prep").cols), 9)
        # eq_(len(db.h5file.getNode("/newton/raw").cols), 7)
        # eq_(len(db.h5file.getNode("/newton/zzz/rawnotch").cols), 10)
        # assert(db.h5file.getNode("/newton/prep").colindexed["timestamp"])
        # assert(not db.h5file.getNode("/newton/prep").colindexed["p1"])

        # # Set / get metadata
        # eq_(db.stream_get_metadata("/newton/prep"), {})
        # eq_(db.stream_get_metadata("/newton/raw"), {})
        # meta1 = { "description": "The Data",
        #           "v_scale": "1.234" }
        # meta2 = { "description": "The Data" }
        # meta3 = { "v_scale": "1.234" }
        # db.stream_set_metadata("/newton/prep", meta1)
        # db.stream_update_metadata("/newton/prep", {})
        # db.stream_update_metadata("/newton/raw", meta2)
        # db.stream_update_metadata("/newton/raw", meta3)
        # eq_(db.stream_get_metadata("/newton/prep"), meta1)
        # eq_(db.stream_get_metadata("/newton/raw"), meta1)


    #     streams = getjson("/stream/list")

    #     eq_(streams, [
    #         ['/newton/prep', 'PrepData'],
    #         ['/newton/raw', 'RawData'],
    #         ['/newton/zzz/rawnotch', 'RawNotchedData'],
    #         ])

    #     streams = getjson("/stream/list?layout=RawData")
    #     eq_(streams, [['/newton/raw', 'RawData']])

    #     streams = getjson("/stream/list?layout=NoSuchLayout")
    #     eq_(streams, [])

    #     with assert_raises(HTTPError) as e:
    #         getjson("/stream/get_metadata?path=foo")
    #     eq_(e.exception.code, 404)

    #     data = getjson("/stream/get_metadata?path=/newton/prep")
    #     eq_(data, {'description': 'The Data', 'v_scale': '1.234'})

    #     data = getjson("/stream/get_metadata?path=/newton/prep"
    #                    "&key=v_scale")
    #     eq_(data, {'v_scale': '1.234'})

    #     data = getjson("/stream/get_metadata?path=/newton/prep"
    #                    "&key=v_scale&key=description")
    #     eq_(data, {'description': 'The Data', 'v_scale': '1.234'})

    #     data = getjson("/stream/get_metadata?path=/newton/prep"
    #                    "&key=v_scale&key=foo")
    #     eq_(data, {'foo': None, 'v_scale': '1.234'})

    #     data = getjson("/stream/get_metadata?path=/newton/prep"
    #                    "&key=foo")
    #     eq_(data, {'foo': None})


    # def test_insert(self):
    #     # invalid path first
    #     with assert_raises(HTTPError) as e:
    #         getjson("/stream/insert?path=/newton/")
    #     eq_(e.exception.code, 404)

    #     # XXX TODO
    #     with assert_raises(HTTPError) as e:
    #         getjson("/stream/insert?path=/newton/prep")
    #     eq_(e.exception.code, 501)