# standard import
import json
import os
import logging
import argparse
import sys
from http.server import (
        HTTPServer,
        BaseHTTPRequestHandler,
    )

# external imports
import confini
from jsonrpc_std.parse import jsonrpc_from_str
from jsonrpc_std.interface import jsonrpc_response

# local imports
from eth_stat_syncer.store import RunStore

logging.basicConfig(level=logging.WARNING)
logg = logging.getLogger()

default_config_dir = os.environ.get('CONFINI_DIR', './config')

argparser = argparse.ArgumentParser()
argparser.add_argument('-c', '--config', dest='c',  default=default_config_dir, type=str, help='rpc provider')
argparser.add_argument('--host', type=str, help='httpd host')
argparser.add_argument('--port', type=str, help='httpd port')
argparser.add_argument('--store-dir', dest='store_dir', type=str, help='syncerd data store base directory')
argparser.add_argument('--env-prefix', default=os.environ.get('CONFINI_ENV_PREFIX'), dest='env_prefix', type=str, help='environment prefix for variables to overwrite configuration')
argparser.add_argument('-v', action='store_true', help='be verbose')
argparser.add_argument('-vv', action='store_true', help='be more verbose')
args = argparser.parse_args()

if args.vv:
    logging.getLogger().setLevel(logging.DEBUG)
elif args.v:
    logging.getLogger().setLevel(logging.INFO)

config = confini.Config(args.c, args.env_prefix)
config.process()
# override args
args_override = {
        'HTTPD_HOST': getattr(args, 'host'),
        'HTTPD_PORT': getattr(args, 'port'),
        'STORE_BASE_DIR': getattr(args, 'store_dir'),
        }
config.dict_override(args_override, 'cli flag')
logg.debug('loaded config: {}\n'.format(config))
 
class StatRequestHandler(BaseHTTPRequestHandler):

    runstore = None
    server_version = 'eth_stat_syncer/0.0.1'


    def do_POST(self):

        if self.headers.get('Content-Type') != 'application/json':
            self.send_response(400, 'me read json only')
            self.end_headers()
            return

        if 'application/json' not in self.headers.get('Accept').split(','):
            self.send_response(400, 'me json only speak')
            self.end_headers()
            return

        l = self.headers.get('Content-Length')
        try:
            l = int(l)
        except ValueError:
            self.send_response(400, 'content length must be integer')
            self.end_headers()
            return
        if l > 4096:
            self.send_response(400, 'too much information')
            self.end_headers()
            return
        if l < 0:
            self.send_response(400, 'you are too negative')
            self.end_headers()
            return

        b = b''
        c = 0
        while c < l:
            d = self.rfile.read(l-c)
            if d == None:
                break
            b += d
            c += len(d)
            if c > 4096:
                self.send_response(413, 'i should slap you around for lying about your size')
                self.end_headers()
                return
       
        o = None
        err = None
        try:
            o = jsonrpc_from_str(b.decode('utf-8'))
        except JSONRPCException as e:
            err = e

        if err != None:
            res = e
            self.send_response(200, 'alas with jsonrpc error')

        else:
            r = self.runstore.get('high', 'minute')
            r = int(r)
            if r == 0:
                r = 1
            res = jsonrpc_response(o['id'], r)
            logg.debug('returning {} for req {} {}'.format(r, o, self.requestline))
            self.send_response(200, 'It\'s a gas')

        b = json.dumps(res).encode('utf-8')
        l = len(b)
        self.send_header('Content-Length', str(l))
        self.send_header('Cache-Control', 'no-cache')
        self.send_header('Content-Type', 'application/json')
        self.end_headers()

        c = 0
        while c < l:
            n = self.wfile.write(b[c:])
            c += n


def run(store, host=None, port=None):
    if host == None:
        host = ''
    if port == None:
        port = 8000
    StatRequestHandler.runstore = store
    server_address = (host, port)
    httpd = HTTPServer(server_address, StatRequestHandler)
    httpd.serve_forever()


if __name__ == '__main__':
    store = RunStore(basedir=config.get('STORE_BASE_DIR'))
    run(store, host=config.get('HTTPD_HOST'), port=config.get('HTTPD_PORT'))