#!/usr/bin/env python3
import click
import sys
from collections import OrderedDict
import json
import os
import urllib.parse
import stat

class ConfigFile:
    def __init__(self, envname, currency, exchange_pub, twisted, filename):
        self.sections = OrderedDict()
        self.envname = envname
        self.filename = filename
        self.currency = currency
        self.twisted = twisted
        self.exchange_pub = exchange_pub

    def destroy(self):
        del self.sections
        self.sections = OrderedDict()

    def cfg_put(self, section_name, key, value):
        s = self.sections[section_name] = self.sections.get(section_name, OrderedDict())
        s[key] = value

    def cfg_write(self, outdir):

        if outdir:
            fstream = open(os.path.join(outdir, self.filename), "w")
        else:
            fstream = open(sys.stdout)

        for section_name, section in self.sections.items():
            fstream.write("[" + section_name + "]" + "\n")
            for key, value in section.items():
                fstream.write(key + " = " + value + "\n")
            fstream.write("\n")
        fstream.close()

def coin(obj,
         name,
         value,
         d_withdraw="3 years",
         d_spend="5 years",
         d_legal="10 years",
         f_withdraw="0.01",
         f_deposit="0.01",
         f_refresh="0.01",
         f_refund="0.01",
         rsa_keysize="2048"):
    sec = "coin_"+obj.currency+"_"+name
    obj.cfg_put(sec, "value", obj.currency+":"+value)
    obj.cfg_put(sec, "duration_withdraw", d_withdraw)
    obj.cfg_put(sec, "duration_spend", d_spend)
    obj.cfg_put(sec, "duration_legal", d_legal)
    obj.cfg_put(sec, "fee_withdraw", obj.currency+":"+f_withdraw)
    obj.cfg_put(sec, "fee_refresh", obj.currency+":"+f_refresh)
    obj.cfg_put(sec, "fee_refund", obj.currency+":"+f_refund)
    obj.cfg_put(sec, "fee_deposit", obj.currency+":"+f_deposit)
    obj.cfg_put(sec, "rsa_keysize", rsa_keysize)

def config(obj):
    obj.cfg_put("paths", "TALER_DEPLOYMENT_DATA", "${HOME}/taler-data")
    obj.cfg_put("paths", "TALER_DATA_HOME", "${HOME}/taler-data")
    obj.cfg_put("taler", "CURRENCY", obj.currency)
    obj.cfg_put("taler", "CURRENCY_ROUND_UNIT", f"{obj.currency}:0.01")

    # Twisting the merchant backend responses.
    if obj.twisted:

        ##
        # Instructs ARM to lunch the Twisters, any value works.
        # If missing, ARM will not launch Twisters.
        obj.cfg_put("twister", "taler_deploy", "")

        obj.cfg_put("twister", "serve", "unix")
        obj.cfg_put("twister", "chaos_rate", "20")
        obj.cfg_put("twister", "destination_base_url", "https://backend.{}.taler.net".format(obj.envname))
        obj.cfg_put("twister", "serve_unixpath", "$HOME/sockets/twister.http")
        obj.cfg_put("twister", "serve_unixmode", "660")
        obj.cfg_put("twister", "unixpath", "$HOME/sockets/twister-control.sock")
        obj.cfg_put("twister", "unix_match_uid", "no")
        obj.cfg_put("twister", "unix_match_gid", "yes")

    obj.cfg_put("bank", "serve", "uwsgi")
    obj.cfg_put("bank", "uwsgi_serve", "unix")
    obj.cfg_put("bank", "uwsgi_unixpath", "$HOME/sockets/bank.uwsgi")
    obj.cfg_put("bank", "uwsgi_unixpath_mode", "660")
    obj.cfg_put("bank", "database", "taler"+obj.envname)
    obj.cfg_put("bank", "max_debt", "%s:0.0" % obj.currency)
    obj.cfg_put("bank", "max_debt_bank", "%s:1000000000.0" % obj.currency)
    obj.cfg_put("bank", "allow_registrations", "YES")


    obj.cfg_put("bank", "database", "postgres:///taler{}".format(obj.envname))
    obj.cfg_put("bank", "suggested_exchange", "https://exchange.{}.taler.net/".format(obj.envname))


    obj.cfg_put("bank-admin", "uwsgi_serve", "unix")
    obj.cfg_put("bank-admin", "uwsgi_unixpath", "$HOME/sockets/bank-admin.uwsgi")
    obj.cfg_put("bank-admin", "uwsgi_unixpath_mode", "660")

    obj.cfg_put("donations", "uwsgi_serve", "unix")
    obj.cfg_put("donations", "uwsgi_unixpath", "$HOME/sockets/donations.uwsgi")
    obj.cfg_put("donations", "uwsgi_unixpath_mode", "660")

    obj.cfg_put("survey", "uwsgi_serve", "unix")
    obj.cfg_put("survey", "uwsgi_unixpath", "$HOME/sockets/survey.uwsgi")
    obj.cfg_put("survey", "uwsgi_unixpath_mode", "660")

    obj.cfg_put("blog", "uwsgi_serve", "unix")
    obj.cfg_put("blog", "uwsgi_unixpath", "$HOME/sockets/shop.uwsgi")
    obj.cfg_put("blog", "uwsgi_unixpath_mode", "660")
    obj.cfg_put("blog", "instance", "FSF")

    obj.cfg_put("backoffice-all", "backend", "https://backend.{}.taler.net/".format(obj.envname))

    # Keep only one back-office service for all instances, for simplicity.
    obj.cfg_put("backoffice-all", "uwsgi_serve", "unix")
    obj.cfg_put("backoffice-all", "uwsgi_unixpath_mode", "660")
    obj.cfg_put("backoffice-all", "uwsgi_unixpath", "$HOME/sockets/backoffice.uwsgi")
    obj.cfg_put("backoffice-all", "instances", "FSF default Tor")

    obj.cfg_put("merchant", "serve", "unix")
    obj.cfg_put("merchant", "unixpath", "$HOME/sockets/merchant.http")
    obj.cfg_put("merchant", "wire_transfer_delay", "0 s")
    obj.cfg_put("merchant", "default_max_wire_fee", obj.currency + ":" + "0.01")
    obj.cfg_put("merchant", "default_max_deposit_fee", obj.currency + ":" + "0.05")

    obj.cfg_put("merchantdb-postgres", "config", "postgres:///taler{}".format(obj.envname))

    obj.cfg_put("frontends", "backend_apikey", "sandbox".format(obj.envname))

    if "demo" != obj.envname and obj.twisted:
        obj.cfg_put("frontends", "backend", "https://twister-backend.wild.gv.taler.net/")
    else:
        obj.cfg_put("frontends", "backend", "https://backend.{}.taler.net/".format(obj.envname))

    obj.cfg_put("merchant-exchange-{}".format(obj.currency), "master_key", obj.exchange_pub)
    obj.cfg_put("merchant-exchange-{}".format(obj.currency), "currency", obj.currency)
    obj.cfg_put("merchant-exchange-{}".format(obj.currency), "exchange_base_url", "https://exchange.{}.taler.net/".format(obj.envname))

    obj.cfg_put("auditor", "serve", "unix")
    obj.cfg_put("auditor", "auditor_url", "https://auditor.{}.taler.net/service/".format(obj.envname))
    obj.cfg_put("auditor", "unixpath", "$HOME/sockets/auditor.http")
    obj.cfg_put("auditor", "tiny_amount", obj.currency + ":0.01")

    obj.cfg_put("exchange", "base_url", "https://exchange.{}.taler.net/".format(obj.envname))
    obj.cfg_put("exchange", "serve", "unix")
    obj.cfg_put("exchange", "unixpath", "$HOME/sockets/exchange.http")
    obj.cfg_put("exchange", "master_public_key", obj.exchange_pub)
    obj.cfg_put("exchange", "terms_etag", "0")
    obj.cfg_put("exchange", "terms_dir", "$HOME/local/share/taler-exchange/tos")

    obj.cfg_put("exchangedb-postgres", "db_conn_str", "postgres:///taler{}".format(obj.envname))
    obj.cfg_put("exchangedb-postgres", "config", "postgres:///taler{}".format(obj.envname))
    obj.cfg_put("auditordb-postgres", "db_conn_str", "postgres:///taler{}".format(obj.envname))
    obj.cfg_put("auditordb-postgres", "config", "postgres:///taler{}".format(obj.envname))

    if "demo" != obj.envname and obj.twisted:
        bank_acct_url = "https://twister-bank.wild.gv.taler.net/taler-wire-gateway/Exchange/"
    else:
        bank_acct_url = f"https://bank.{obj.envname}.taler.net/taler-wire-gateway/Exchange/"

    obj.cfg_put("exchange-account-1", "payto_uri", "payto://x-taler-bank/bank.{}.taler.net/Exchange".format(obj.envname))
    obj.cfg_put("exchange-account-1", "wire_response", "${TALER_DATA_HOME}/exchange/wire/test.json")
    obj.cfg_put("exchange-account-1", "wire_gateway_auth_method", "basic")
    obj.cfg_put("exchange-account-1", "wire_gateway_url", bank_acct_url)
    obj.cfg_put("exchange-account-1", "username", "Exchange")
    obj.cfg_put("exchange-account-1", "password", "x")
    obj.cfg_put("exchange-account-1", "enable_debit", "yes")
    obj.cfg_put("exchange-account-1", "enable_credit", "yes")

    obj.cfg_put("fees-x-taler-bank", "wire-fee-2018", obj.currency + ":" + "0.02")
    obj.cfg_put("fees-x-taler-bank", "wire-fee-2019", obj.currency + ":" + "0.03")
    obj.cfg_put("fees-x-taler-bank", "wire-fee-2020", obj.currency + ":" + "0.04")
    obj.cfg_put("fees-x-taler-bank", "wire-fee-2021", obj.currency + ":" + "0.04")
    obj.cfg_put("fees-x-taler-bank", "wire-fee-2022", obj.currency + ":" + "0.05")
    obj.cfg_put("fees-x-taler-bank", "wire-fee-2023", obj.currency + ":" + "0.06")
    obj.cfg_put("fees-x-taler-bank", "wire-fee-2024", obj.currency + ":" + "0.07")
    obj.cfg_put("fees-x-taler-bank", "wire-fee-2025", obj.currency + ":" + "0.08")

    obj.cfg_put("fees-x-taler-bank", "closing-fee-2018", obj.currency + ":" + "0.01")
    obj.cfg_put("fees-x-taler-bank", "closing-fee-2019", obj.currency + ":" + "0.01")
    obj.cfg_put("fees-x-taler-bank", "closing-fee-2020", obj.currency + ":" + "0.01")
    obj.cfg_put("fees-x-taler-bank", "closing-fee-2021", obj.currency + ":" + "0.01")
    obj.cfg_put("fees-x-taler-bank", "closing-fee-2022", obj.currency + ":" + "0.01")
    obj.cfg_put("fees-x-taler-bank", "closing-fee-2023", obj.currency + ":" + "0.01")
    obj.cfg_put("fees-x-taler-bank", "closing-fee-2024", obj.currency + ":" + "0.01")
    obj.cfg_put("fees-x-taler-bank", "closing-fee-2025", obj.currency + ":" + "0.01")

    # how long is one signkey valid?
    obj.cfg_put("exchange_keys", "signkey_duration", "18 weeks")

    # how long are the signatures with the signkey valid?
    obj.cfg_put("exchange_keys", "legal_duration", "2 years")

    # how long do we generate denomination and signing keys
    # ahead of time?
    obj.cfg_put("exchange_keys", "lookahead_sign", "32 weeks 1 day")

    obj.cfg_put("exchange_keys", "lookahead_provide", "4 weeks 1 day")

    # instance FSF
    obj.cfg_put("instance-FSF", "keyfile", "${TALER_DATA_HOME}/merchant/fsf.priv")
    obj.cfg_put("instance-FSF", "name", "Free Software Foundation")
    obj.cfg_put("merchant-location-FSF-address", "street", "51 Franklin Street, Fifth Floor.")
    obj.cfg_put("merchant-location-FSF-address", "city", "Boston")
    obj.cfg_put("merchant-location-FSF-address", "country", "USA")
    # instance Tor
    obj.cfg_put("instance-Tor", "keyfile", "${TALER_DATA_HOME}/merchant/tor.priv")
    obj.cfg_put("instance-Tor", "name", "The Tor Project")
    # instance GNUnet
    obj.cfg_put("instance-GNUnet", "keyfile", "${TALER_DATA_HOME}/merchant/gnunet.priv")
    obj.cfg_put("instance-GNUnet", "name", "GNUnet Project")
    # instance Taler
    obj.cfg_put("instance-Taler", "keyfile", "${TALER_DATA_HOME}/merchant/taler.priv")
    obj.cfg_put("instance-Taler", "name", "Taler")
    # instance default
    obj.cfg_put("instance-default", "keyfile", "${TALER_DATA_HOME}/merchant/default.priv")
    obj.cfg_put("instance-default", "name", "Kudos Inc.")
    obj.cfg_put("merchant-location-default-address", "country", "Kudosland")
    obj.cfg_put("instance-default", "tip_reserve_priv_filename", "${TALER_DATA_HOME}/merchant/default-tip.priv")
    obj.cfg_put("instance-default", "tip_exchange", "https://exchange.{}.taler.net/".format(obj.envname))
    # instance tutorial
    obj.cfg_put("instance-Tutorial", "keyfile", "${TALER_DATA_HOME}/merchant/tutorial.priv")
    obj.cfg_put("instance-Tutorial", "name", "Tutorial")

    if "demo" != obj.envname and obj.twisted:
        obj.cfg_put("merchant-account-merchant", "payto_uri", "payto://x-taler-bank/twister-bank.taler.net/Tutorial")
    else:
        obj.cfg_put("merchant-account-merchant", "payto_uri", "payto://x-taler-bank/bank.{}.taler.net/Tutorial".format(obj.envname))

    obj.cfg_put("merchant-account-merchant", "wire_response", "${TALER_DATA_HOME}/merchant/wire/merchant.json")
    obj.cfg_put("merchant-account-merchant", "wire_file_mode", "770")

    merchant_instance_names = ("default", "Tor", "GNUnet", "Taler", "FSF", "Tutorial")
    for mi in merchant_instance_names:
        obj.cfg_put("merchant-account-merchant", f"HONOR_{mi}", "YES")
        obj.cfg_put("merchant-account-merchant", f"ACTIVE_{mi}", "YES")

    coin(obj, "ct_10", "0.10")
    coin(obj, "1", "1")
    coin(obj, "2", "2")
    coin(obj, "5", "5")
    coin(obj, "10", "10")
    coin(obj, "1000", "1000")


@click.command()
@click.option("--currency", default="KUDOS")
@click.option("--envname", default="demo")
@click.option("--outdir", required=True)
# datadir is where all keys / wire-details files / are placed.
@click.option("--exchange-pub", required=True)
@click.option("--twisted", is_flag=True)
def main(currency, envname, outdir, exchange_pub, twisted):

    if envname not in ("demo", "test", "int", "euro", "chf"):
        print("envname (%s) not demo/test/int, aborting config generation" % envname)
        return

    config_files = []

    mc = ConfigFile(envname, currency, exchange_pub, twisted, "taler.conf")
    config(mc)
    config_files.append(mc)

    sc = ConfigFile(envname, currency, exchange_pub, twisted, "sync.conf")
    sc.cfg_put("sync", "annual_fee", sc.currency+":0.1")
    sc.cfg_put("sync", "serve", "unix")
    sc.cfg_put("syncdb-postgres", "config", "postgres:///taler%s" % envname)
    sc.cfg_put("sync", "unixpath", "$HOME/sockets/sync.http")
    sc.cfg_put("taler", "currency", sc.currency)
    sc.cfg_put("sync", "unixpath", "$HOME/sockets/sync.http")
    config_files.append(sc)

    if "demo" != envname and twisted:

        # Twisting the exchange.
        twist_exchange_conf = ConfigFile(envname, currency, exchange_pub, "twister-exchange.conf")
        twist_exchange_conf.cfg_put("twister", "serve", "unix")
        twist_exchange_conf.cfg_put("twister", "chaos_rate", "20")
        twist_exchange_conf.cfg_put("twister", "destination_base_url", "https://exchange.{}.taler.net" % envname)
        twist_exchange_conf.cfg_put("twister", "serve_unixpath", "$HOME/sockets/twister-exchange.http")
        twist_exchange_conf.cfg_put("twister", "serve_unixmode", "660")
        twist_exchange_conf.cfg_put("twister", "unixpath", "$HOME/sockets/twister-exchange-control.sock")
        twist_exchange_conf.cfg_put("twister", "unix_match_uid", "no")
        twist_exchange_conf.cfg_put("twister", "unix_match_gid", "yes")
        config_files.append(twist_exchange_conf)

        # Twisting the bank.
        twist_bank_conf = ConfigFile(envname, currency, exchange_pub, "twister-bank.conf")
        twist_bank_conf.cfg_put("twister", "serve", "unix")
        twist_bank_conf.cfg_put("twister", "chaos_rate", "20")
        twist_bank_conf.cfg_put("twister", "destination_base_url", "https://bank.{}.taler.net" % envname)
        twist_bank_conf.cfg_put("twister", "serve_unixpath", "$HOME/sockets/twister-bank.http")
        twist_bank_conf.cfg_put("twister", "serve_unixmode", "660")
        twist_bank_conf.cfg_put("twister", "unixpath", "$HOME/sockets/twister-bank-control.sock")
        twist_bank_conf.cfg_put("twister", "unix_match_uid", "no")
        twist_bank_conf.cfg_put("twister", "unix_match_gid", "yes")

        config_files.append(twist_bank_conf)

    assert (0 < len(config_files))
    for obj in config_files:
        obj.cfg_write(outdir)

if __name__ == "__main__":
    main()