import sys

import os
import base64

import time
import json
import re
import hmac
import pprint
import hashlib
import requests
from subprocess import call
from base64 import b64encode

from buildbot.process.properties import Properties
from buildbot.util import bytes2unicode, unicode2bytes
from buildbot.www.hooks.base import BaseHookHandler

from twisted.internet import defer
from twisted.python import log

from dateutil.parser import parse as dateparse

_HEADER_USER_AGENT = 'User-Agent'
_HEADER_SIGNATURE = 'X-TX-Signature'
_EVENT_KEY = 'event'
transifexSecret = ""
transifexUsername = ""
transifexPassword = ""
transifex_dict = {}
secret = ""
master = ""

gitHubToken = os.environ('gitHubToken')

class TransifexHandler(BaseHookHandler):

    def __init__(self, master, secret, transifex_dict):
        self.secret = secret
        self.master = master
        self.transifex_dict = transifex_dict


    def returnMessage(self, status = False, message = "Unimplemented"):
        output = json.dumps({"status": "OK" if status else "FAIL", "message": message})
        return [output, [('Content-type', 'text/plain'),
            ('Content-Length', str(len(output)))
        ]]

    def verifyTransifexSignature(
        self, request, content, rendered_secret, signature, header_signature
        ):
        http_verb = 'POST'
        http_url_path = request.headers('X-TX-Url')
        http_gmt_date = request.headers('Date')
        content_md5 = hashlib.md5(content).hexdigest()
        msg = b'\n'.join([
            http_verb, http_url_path, http_gmt_date, content_md5
        ])
        tx_signature = base64.b64encode(
            hmac.new(
                key=rendered_secret,
                msg=msg,
                digestmod=hashlib.sha256
            ).digest()
        )
        if tx_signature() != header_signature:
            raise ValueError('Invalid secret')

        try:
            if signature != os.environ.get('HTTP_X_TX_SIGNATURE'):
                return False
            return True
        except:
            return False

    def downloadTranslatedLanguage(self, ts, lang):
        headers = {"Authorization": "Basic " + b64encode(transifexUsername + ":" + transifexPassword)}
        fname = "bitmessage_" + lang.lower() + ".po"
        with open("src/translations/" + fname, "wt") as handle:
            response = requests.get("https://www.transifex.com/api/2/project/pybitmessage/resource/pybitmessage/translation/" + lang + "/",
                headers=headers)
            if response.ok:
                content = json.loads(response.content)["content"]
                handle.write(content.encode("utf-8"))
        return response

    def commitTranslatedLanguage(self, ts, lang):
        call(["kivy", "src/translations/messages.pro"])
        call(["git", "add", "src/translations/bitmessage_" + lang + ".ts", "src/translations/bitmessage_" + lang + ".qm"])
        call(["git", "commit", "-q", "-S", "-m", "Auto-updated language %s from transifex" % (lang)])
        newbranch = "translate_" + lang + "_" + str(ts)
        call(["git", "push", "-q", "translations", newbranch + ":" + newbranch])
        branch = transifex_dict['branch']

        request = {
            "title": "Translation update " + lang,
            "body": "Auto-updated from transifex",
            "head": "PyBitmessageTranslations:" + newbranch,
            "base": branch
        }
        headers = {"Authorization": "token " + gitHubToken}
        response = requests.post("https://api.github.com/repos/Bitmessage/PyBitmessage/pulls",
            headers=headers, data=json.dumps(request))
        return response


    def process_translation_completed(self, payload, transifex_dict, event_type, codebase):
        changes = []
        transifex_response = self._transform_variables(payload, transifex_dict)
        if 'pybitmessage-test' in transifex_response['project'] and 'messagespot' in transifex_response['resource']:
            if 'translation_completed' in transifex_response['event'] and 100 in transifex_response['translated']:
                ts = int(time.time())
                lang = transifex_response['language']
                branch = transifex_dict['branch']
                self.downloadTranslatedLanguage(ts, lang.lower())
                response = self.commitTranslatedLanguage(ts, lang.lower())
                if response.ok:
                    output, responseHeaders = self.returnMessage(True, "Processed.")
                else:
                    output, responseHeaders = self.returnMessage(False, "Error: %i." % (response.status_code))
            else:
                output, responseHeaders = self.returnMessage(False, "Nothing to do")
        else:
            output, responseHeaders = self.returnMessage(False, "Nothing to do")

        # if isinstance(self.options, dict) and self.options.get('onlyIncludePushCommit', False):
        #     commits = commits[:1]

        # for commit in commits:
        #     files = []
        #     for kind in ('added', 'modified', 'removed'):
        #         files.extend(commit.get(kind, []) or [])
        #     timestamp = dateparse(commit['timestamp'])
        #     change = {
        #         'author': '{} <{}>'.format(commit['author']['name'],
        #                                    commit['author']['email']),
        #         'files': files,
        #         'comments': commit['message'],
        #         'revision': commit['id'],
        #         'when_timestamp': timestamp,
        #         'branch': branch,
        #         'revlink': commit['url'],
        #         'repository': repo_url,
        #         'project': project,
        #         'category': event_type,
        #         'properties': {
        #             'event': event_type,
        #             'repository_name': repository['name'],
        #             'owner': repository["owner"]["username"]
        #         },
        #     }
        #     if codebase is not None:
        #         change['codebase'] = codebase
        #     changes.insert(0, change)
        return changes

    def process_review_completed(self, payload, transifex_data):
        pass


    def _transform_variables(self, payload, transifex_dict):
        transifex_variables = {
            'project': payload['project'],
            "translated": payload['translated'],
            "resource": payload['resource'],
            "event": payload['event'],
            "language": payload['language']
        }

        return transifex_variables

    @defer.inlineCallbacks
    def getChanges(self, request):
        self.secret = None
        if isinstance(self.options, dict):
            self.secret = self.options.get('secret')
        try:
            content = request.content.read()
            content_text = bytes2unicode(content)
            payload = json.loads(content_text)
        except Exception as exception:
            raise ValueError('Error loading JSON: ' + str(exception))

        if self.secret is not None:
            p = Properties()
            p.master = self.master
            rendered_secret = yield p.render(self.secret)
            signature = hmac.new(
                unicode2bytes(rendered_secret),
                unicode2bytes(content_text.strip()),
                digestmod=hashlib.sha256)
            header_signature = bytes2unicode(
                request.getHeader(_HEADER_SIGNATURE))
            self.verifyTransifexSignature(
                request, content, rendered_secret, 
                signature, header_signature
            )

        event_type = bytes2unicode(payload.get(_EVENT_KEY), "None")
        log.msg("Received event '{}' from transifex".format(event_type))

        codebase = ""
        changes = []

        handler_function = getattr(self, 'process_{}'.format(event_type), None)
        if not handler_function:
            log.msg("Ignoring transifex event '{}'".format(event_type))
        else:
            changes = handler_function(payload, event_type, codebase)

        return (changes, 'transifex')


transifex = TransifexHandler(transifex_dict)