#!/usr/bin/python3

import sys, os, getopt, pwd
from fulbank import auth

sesstype = None
sess = None

def find(seq, *, item=None, match=None, key=None, default=LookupError):
    if key is None:
        key = lambda o: o
    if match is None and item is not None:
        match = lambda o: o == item
    for thing in seq:
        if match(key(thing)):
            return thing
    if default is LookupError:
        raise LookupError()
    else:
        return default

def usage(out):
    out.write("usage: netbank [-h] BANK-ID COMMAND [ARGS...]")

def requiresess(fn):
    def wrap(cmd, args):
        if sess is None:
            sys.stderr.write("netbank: %s: no current session\n" % (cmd))
            sys.exit(1)
        return fn(cmd, args)
    return wrap

commands = {}

def cmd_login(cmd, args):
    global sess
    if len(args) < 1:
        sys.stderr.write("usage: login TYPE\n")
        sys.exit(1)
    sess = sesstype.create()
    if args[0] == "bankid":
        if len(args) < 2:
            sys.stderr.write("usage: login bankid USER-ID\n")
            sys.exit(1)
        with auth.ttyconv() as conv:
            sess.auth_bankid(args[1], conv)
    else:
        sys.stderr.write("netbank: %s: unknown authentication type\n" % (args[0]))
        sys.exit(1)
commands["login"] = cmd_login

@requiresess
def cmd_logout(cmd, args):
    global sess
    if sess is not None:
        sess.close()
        sess = None
commands["logout"] = cmd_logout

@requiresess
def cmd_ping(cmd, args):
    sess.keepalive()
commands["ping"] = cmd_ping

@requiresess
def cmd_lsacct(cmd, args):
    for acct in sess.accounts:
        sys.stdout.write("%s (%s): %s\n" % (acct.number, acct.name, acct.balance))
commands["lsacct"] = cmd_lsacct

@requiresess
def cmd_lstxn(cmd, args):
    opts, args = getopt.getopt(args, "n:")
    num = 10
    for o, a in opts:
        if o == "-n":
            num = int(a)
    if len(args) < 1:
        sys.stderr.write("usage: lstxn [-n NUM] ACCOUNT\n")
        sys.exit(1)
    try:
        acct = find(sess.accounts, item=args[0], key=lambda acct: acct.number)
    except LookupError:
        sys.stderr.write("netbank: %s: no such account\n" % (args[0]))
        sys.exit(1)
    for i, txn in zip(range(num), acct.transactions()):
        sys.stdout.write("%s %s: %s\n" % (txn.date.isoformat(), txn.value, txn.message))
commands["lstxn"] = cmd_lstxn

def main():
    global sess, sesstype

    opts, args = getopt.getopt(sys.argv[1:], "h")
    for o, a in opts:
        if o == "-h":
            usage(sys.stdout)
            sys.exit(0)
    if len(args) < 2:
        usage(sys.stderr)
        sys.exit(1)

    if args[0] == "fsb":
        import fulbank.fsb
        sesstype = fulbank.fsb.session
    else:
        sys.stderr.write("netbank: %s: unknown bank id\n" % (args[0]))
        sys.exit(1)
    sesspath = os.path.join(pwd.getpwuid(os.getuid()).pw_dir, ".cache/fulbank", args[0])
    cmd = args[1]
    args = args[2:]

    if os.path.exists(sesspath):
        sess = sesstype.load(sesspath)
    else:
        sess = None
    if cmd in commands:
        commands[cmd](cmd, args)
    else:
        sys.stderr.write("netbank: %s: unknown command\n" % (cmd))
        sys.exit(1)
    if sess is not None:
        sessdir = os.path.dirname(sesspath)
        if not os.path.isdir(sessdir):
            os.makedirs(sessdir)
        sess.save(sesspath)
    else:
        if os.path.exists(sesspath):
            os.unlink(sesspath)

try:
    if __name__ == "__main__":
        main()
except KeyboardInterrupt:
    sys.exit(1)