from datetime import datetime
import argparse
import configparser
import psycopg2
import os
import sys

import portfolio

def make_order(market, value, currency, action="acquire",
        close_if_possible=False, base_currency="BTC", follow=True,
        compute_value="average"):
    """
    Make an order on market
    "market": The market on which to place the order
    "value": The value in *base_currency* to acquire,
             or in *currency* to dispose.
             use negative for margin trade.
    "action": "acquire" or "dispose".
                "acquire" will buy long or sell short,
                "dispose" will sell long or buy short.
    "currency": The currency to acquire or dispose
    "base_currency": The base currency. The value is expressed in that
                     currency (default: BTC)
    "follow": Whether to follow the order once run (default: True)
    "close_if_possible": Whether to try to close the position at the end
                         of the trade, i.e. reach exactly 0 at the end
                         (only meaningful in "dispose"). May have
                         unwanted effects if the end value of the
                         currency is not 0.
    "compute_value": Compute value to place the order
    """
    market.report.log_stage("make_order_begin")
    market.balances.fetch_balances(tag="make_order_begin")
    if action == "acquire":
        trade = portfolio.Trade(
                portfolio.Amount(base_currency, 0),
                portfolio.Amount(base_currency, value),
                currency, market)
    else:
        amount = portfolio.Amount(currency, value)
        trade = portfolio.Trade(
                amount.in_currency(base_currency, market, compute_value=compute_value),
                portfolio.Amount(base_currency, 0),
                currency, market)
    market.trades.all.append(trade)
    order = trade.prepare_order(
            close_if_possible=close_if_possible,
            compute_value=compute_value)
    market.report.log_orders([order], None, compute_value)
    market.trades.run_orders()
    if follow:
        market.follow_orders()
        market.balances.fetch_balances(tag="make_order_end")
    else:
        market.report.log_stage("make_order_end_not_followed")
        return order
    market.report.log_stage("make_order_end")

def get_user_market(config_path, user_id, debug=False):
    import market
    pg_config, report_path = main_parse_config(config_path)
    market_config = list(main_fetch_markets(pg_config, str(user_id)))[0][0]
    return market.Market.from_config(market_config, debug=debug)

def main_parse_args(argv):
    parser = argparse.ArgumentParser(
            description="Run the trade bot")

    parser.add_argument("-c", "--config",
            default="config.ini",
            required=False,
            help="Config file to load (default: config.ini)")
    parser.add_argument("--before",
            default=False, action='store_const', const=True,
            help="Run the steps before the cryptoportfolio update")
    parser.add_argument("--after",
            default=False, action='store_const', const=True,
            help="Run the steps after the cryptoportfolio update")
    parser.add_argument("--debug",
            default=False, action='store_const', const=True,
            help="Run in debug mode")
    parser.add_argument("--user",
            default=None, required=False, help="Only run for that user")
    parser.add_argument("--action",
            action='append',
            help="Do a different action than trading (add several times to chain)")

    args = parser.parse_args(argv)

    if not os.path.exists(args.config):
        print("no config file found, exiting")
        sys.exit(1)

    return args

def main_parse_config(config_file):
    config = configparser.ConfigParser()
    config.read(config_file)

    if "postgresql" not in config:
        print("no configuration for postgresql in config file")
        sys.exit(1)

    if "app" in config and "report_path" in config["app"]:
        report_path = config["app"]["report_path"]

        if not os.path.exists(report_path):
            os.makedirs(report_path)
    else:
        report_path = None

    return [config["postgresql"], report_path]

def main_fetch_markets(pg_config, user):
    connection = psycopg2.connect(**pg_config)
    cursor = connection.cursor()

    if user is None:
        cursor.execute("SELECT config,user_id FROM market_configs")
    else:
        cursor.execute("SELECT config,user_id FROM market_configs WHERE user_id = %s", user)

    for row in cursor:
        yield row

def main_process_market(user_market, actions, before=False, after=False):
    if len(actions or []) == 0:
        if before:
            Processor(user_market).process("sell_all", steps="before")
        if after:
            Processor(user_market).process("sell_all", steps="after")
    else:
        for action in actions:
            if action in globals():
                (globals()[action])(user_market)
            else:
                raise NotImplementedError("Unknown action {}".format(action))

def main_store_report(report_path, user_id, user_market):
    try:
        if report_path is not None:
            report_file = "{}/{}_{}.json".format(report_path, datetime.now().isoformat(), user_id)
            with open(report_file, "w") as f:
                f.write(user_market.report.to_json())
    except Exception as e:
        print("impossible to store report file: {}; {}".format(e.__class__.__name__, e))

def print_orders(market, base_currency="BTC"):
    market.report.log_stage("print_orders")
    market.balances.fetch_balances(tag="print_orders")
    market.prepare_trades(base_currency=base_currency, compute_value="average")
    market.trades.prepare_orders(compute_value="average")

def print_balances(market, base_currency="BTC"):
    market.report.log_stage("print_balances")
    market.balances.fetch_balances()
    if base_currency is not None:
        market.report.print_log("total:")
        market.report.print_log(sum(market.balances.in_currency(base_currency).values()))

class Processor:
    scenarios = {
            "sell_needed": [
                {
                    "name": "wait",
                    "number": 0,
                    "before": False,
                    "after": True,
                    "wait_for_recent": {},
                    },
                {
                    "name": "sell",
                    "number": 1,
                    "before": False,
                    "after": True,
                    "fetch_balances": ["begin", "end"],
                    "prepare_trades": {},
                    "prepare_orders": { "only": "dispose", "compute_value": "average" },
                    "run_orders": {},
                    "follow_orders": {},
                    "close_trades": {},
                    },
                {
                    "name": "buy",
                    "number": 2,
                    "before": False,
                    "after": True,
                    "fetch_balances": ["begin", "end"],
                    "prepare_trades": { "only": "acquire" },
                    "prepare_orders": { "only": "acquire", "compute_value": "average" },
                    "move_balances": {},
                    "run_orders": {},
                    "follow_orders": {},
                    "close_trades": {},
                    },
                ],
            "sell_all": [
                {
                    "name": "all_sell",
                    "number": 1,
                    "before": True,
                    "after": False,
                    "fetch_balances": ["begin", "end"],
                    "prepare_trades": { "repartition": { "base_currency": (1, "long") } },
                    "prepare_orders": { "compute_value": "average" },
                    "run_orders": {},
                    "follow_orders": {},
                    "close_trades": {},
                    },
                {
                    "name": "wait",
                    "number": 2,
                    "before": False,
                    "after": True,
                    "wait_for_recent": {},
                    },
                {
                    "name": "all_buy",
                    "number": 3,
                    "before": False,
                    "after": True,
                    "fetch_balances": ["begin", "end"],
                    "prepare_trades": {},
                    "prepare_orders": { "compute_value": "average" },
                    "move_balances": {},
                    "run_orders": {},
                    "follow_orders": {},
                    "close_trades": {},
                    },
                ]
            }

    ordered_actions = [
            "wait_for_recent", "prepare_trades", "prepare_orders",
            "move_balances", "run_orders", "follow_orders",
            "close_trades"]

    def __init__(self, market):
        self.market = market

    def select_steps(self, scenario, step):
        if step == "all":
            return scenario
        elif step == "before" or step == "after":
            return list(filter(lambda x: step in x and x[step], scenario))
        elif type(step) == int:
            return [scenario[step-1]]
        elif type(step) == str:
            return list(filter(lambda x: x["name"] == step, scenario))
        else:
            raise TypeError("Unknown step {}".format(step))

    def process(self, scenario_name, steps="all", **kwargs):
        scenario = self.scenarios[scenario_name]
        selected_steps = []

        if type(steps) == str or type(steps) == int:
            selected_steps += self.select_steps(scenario, steps)
        else:
            for step in steps:
                selected_steps += self.select_steps(scenario, step)
        for step in selected_steps:
            self.process_step(scenario_name, step, kwargs)

    def process_step(self, scenario_name, step, kwargs):
        process_name = "process_{}__{}_{}".format(scenario_name, step["number"], step["name"])
        self.market.report.log_stage("{}_begin".format(process_name))
        if "begin" in step.get("fetch_balances", []):
            self.market.balances.fetch_balances(tag="{}_begin".format(process_name))

        for action in self.ordered_actions:
            if action in step:
                self.run_action(action, step[action], kwargs)

        if "end" in step.get("fetch_balances", []):
            self.market.balances.fetch_balances(tag="{}_end".format(process_name))
        self.market.report.log_stage("{}_end".format(process_name))

    def method_arguments(self, action):
        import inspect

        if action == "wait_for_recent":
            method = portfolio.Portfolio.wait_for_recent
        elif action == "prepare_trades":
            method = self.market.prepare_trades
        elif action == "prepare_orders":
            method = self.market.trades.prepare_orders
        elif action == "move_balances":
            method = self.market.move_balances
        elif action == "run_orders":
            method = self.market.trades.run_orders
        elif action == "follow_orders":
            method = self.market.follow_orders
        elif action == "close_trades":
            method = self.market.trades.close_trades

        signature = inspect.getfullargspec(method)
        defaults = signature.defaults or []
        kwargs = signature.args[-len(defaults):]

        return [method, kwargs]

    def parse_args(self, action, default_args, kwargs):
        method, allowed_arguments = self.method_arguments(action)
        args = {k: v for k, v in {**default_args, **kwargs}.items() if k in allowed_arguments }

        if "repartition" in args and "base_currency" in args["repartition"]:
            r = args["repartition"]
            r[args.get("base_currency", "BTC")] = r.pop("base_currency")

        return method, args

    def run_action(self, action, default_args, kwargs):
        method, args = self.parse_args(action, default_args, kwargs)

        if action == "wait_for_recent":
            method(self.market, **args)
        else:
            method(**args)