# standard imports
import os
import urllib.parse
import logging
import re

# external imports
from chainlib.eth.gas import balance
from chainlib.eth.cli.config import Config
from chainlib.eth.cli.config import process_config
from chainlib.eth.cli.arg import ArgFlag
from chainlib.eth.cli.arg import Arg
from chainlib.eth.cli.arg import process_args
from chainlib.settings import ChainSettings
from chainlib.eth.settings import process_settings
from eth_contract_registry import Registry
import chainlib.eth.cli
from leveldir.uuid import UUIDDir

# local imports
from gas3.base import do_yield
from gas3.register import do_register
import gas3.error


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

data_path = os.environ.get('GAS3_DATA_DIR', 'data')
registry = os.environ.get('CIC_REGISTRY_ADDRESS')
data_dir = UUIDDir(data_path)

re_yield = re.compile('^/yield')
re_register = re.compile('^/register')

def process_settings_local(settings, config):
    conn = settings.get('CONN')
    o = balance(settings.get('SENDER_ADDRESS'))
    r = conn.do(o)
    logg.info('signing with address {} balance start {}'.format(settings.get('SENDER_ADDRESS'), int(r, 16)))

    c = Registry(settings.get('CHAIN_SPEC'), gas_oracle=settings.get('GAS_ORACLE'))
    #o = c.address_of(registry, 'registry', sender_address=settings.get('SENDER_ADDRESS'))
    #o['params'][0]['gasPrice'] = "0x3b9aca00"
    #o['params'][0]['gas'] = "0x7530"
    #r = conn.do(o)
    #logg.info('using registry {}'.format(r))

    o = c.address_of(registry, 'accounts', sender_address=settings.get('SENDER_ADDRESS'))
    r = conn.do(o)
    accounts_index = c.parse_address_of(r)
    settings.set('ACCOUNTS_CONTRACT', accounts_index)
    logg.info('using accounts_index {}'.format(accounts_index))

    o = c.address_of(registry, 'faucet', sender_address=settings.get('SENDER_ADDRESS'))
    r = conn.do(o)
    faucet = c.parse_address_of(r)
    settings.set('FAUCET_CONTRACT', faucet)
    logg.info('using faucet {}'.format(faucet))

    return settings


arg_flags = ArgFlag()
arg = Arg(arg_flags)
flags = arg_flags.STD_WRITE | arg_flags.WALLET | arg_flags.EXEC
argparser = chainlib.eth.cli.ArgumentParser()
argparser = process_args(argparser, arg, flags)
args = argparser.parse_args()

config = Config()
config = process_config(config, arg, args, flags)
logg.debug('config loaded:\n{}'.format(config))

settings = ChainSettings()
settings = process_settings(settings, config)
settings = process_settings_local(settings, config)
logg.debug('settings loaded:\n{}'.format(settings))



def application(env, start_response):
    req = urllib.parse.urlparse(env['REQUEST_URI'])
    scode = 200
    stext = 'OK'
    
    r = ''
    if re.match(re_yield, req.path):
        r = do_yield(req, env, data_dir, settings)
    elif re.match(re_register, req.path):
        try:
            r = do_register(req, env, data_dir, settings)
        except gas3.error.Used:
            scode = 410
            stext = 'Code already used'
        except gas3.error.InvalidInput as e:
            scode = 400
            stext = 'Malformed request url'
            r = str(e)
        except FileNotFoundError:
            scode = 403
            stext = 'No such code'
        except Exception as e:
            scode = 500
            stext = 'Server error'
            r = str(e)
    else:
        r = ''
    
    l = len(r)
    status = str(scode) + ' ' + stext
    start_response(status, [('Content-Length', str(l))])
    return [r.encode('utf-8')]