#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# jp: a SàT command line tool
# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import base
from sat.core.i18n import _
from sat.core import exceptions
from sat_frontends.jp.constants import Const as C
from sat.tools.common.ansi import ANSI as A
import subprocess
import argparse
import sys

__commands__ = ["Input"]
OPT_STDIN = 'stdin'
OPT_SHORT = 'short'
OPT_LONG = 'long'
OPT_POS = 'positional'
OPT_IGNORE = 'ignore'
OPT_TYPES = (OPT_STDIN, OPT_SHORT, OPT_LONG, OPT_POS, OPT_IGNORE)
OPT_EMPTY_SKIP = 'skip'
OPT_EMPTY_IGNORE = 'ignore'
OPT_EMPTY_CHOICES = (OPT_EMPTY_SKIP, OPT_EMPTY_IGNORE)


class InputCommon(base.CommandBase):

    def __init__(self, host, name, help):
        base.CommandBase.__init__(self, host, name, use_verbose=True, use_profile=False, help=help)
        self.idx = 0
        self.reset()

    def reset(self):
        self.args_idx = 0
        self._stdin = []
        self._opts = []
        self._pos = []
        self._values_ori = []

    def add_parser_options(self):
        self.parser.add_argument("--encoding", default='utf-8', help=_(u"encoding of the input data"))
        self.parser.add_argument("-i", "--stdin", action='append_const', const=(OPT_STDIN, None), dest='arguments', help=_(u"standard input"))
        self.parser.add_argument("-s", "--short", type=self.opt(OPT_SHORT), action='append', dest='arguments', help=_(u"short option"))
        self.parser.add_argument("-l", "--long", type=self.opt(OPT_LONG), action='append', dest='arguments', help=_(u"long option"))
        self.parser.add_argument("-p", "--positional", type=self.opt(OPT_POS), action='append', dest='arguments', help=_(u"positional argument"))
        self.parser.add_argument("-x", "--ignore", action='append_const', const=(OPT_IGNORE, None), dest='arguments', help=_(u"ignore value"))
        self.parser.add_argument("-D", "--debug", action='store_true', help=_(u"don't actually run commands but echo what would be launched"))
        self.parser.add_argument("--log", type=argparse.FileType('wb'), help=_(u"log stdout to FILE"))
        self.parser.add_argument("--log-err", type=argparse.FileType('wb'), help=_(u"log stderr to FILE"))
        self.parser.add_argument("command", nargs=argparse.REMAINDER)

    def opt(self, type_):
        return lambda s: (type_, s)

    def addValue(self, value):
        """add a parsed value according to arguments sequence"""
        self._values_ori.append(value)
        arguments = self.args.arguments
        try:
            arg_type, arg_name = arguments[self.args_idx]
        except IndexError:
            self.disp(_(u"arguments in input data and in arguments sequence don't match"), error=True)
            self.host.quit(C.EXIT_DATA_ERROR)
        self.args_idx += 1
        while self.args_idx < len(arguments):
            next_arg = arguments[self.args_idx]
            if next_arg[0] not in OPT_TYPES:
                # value will not be used if False or None, so we skip filter
                if value not in (False, None):
                    # we have a filter
                    filter_type, filter_arg = arguments[self.args_idx]
                    value = self.filter(filter_type, filter_arg, value)
            else:
                break
            self.args_idx += 1

        if value is None:
            # we ignore this argument
            return

        if value is False:
            # we skip the whole row
            if self.args.debug:
                self.disp(A.color(C.A_SUBHEADER, _(u'values: '), A.RESET, u', '.join(self._values_ori)), 2)
                self.disp(A.color(A.BOLD, _(u'**SKIPPING**\n')))
            self.reset()
            self.idx += 1
            raise exceptions.CancelError

        if not isinstance(value, list):
            value = [value]

        for v in value:
            if arg_type == OPT_STDIN:
                self._stdin.append(v.encode('utf-8'))
            elif arg_type == OPT_SHORT:
                self._opts.append('-{}'.format(arg_name))
                self._opts.append(v.encode('utf-8'))
            elif arg_type == OPT_LONG:
                self._opts.append('--{}'.format(arg_name))
                self._opts.append(v.encode('utf-8'))
            elif arg_type == OPT_POS:
                self._pos.append(v.encode('utf-8'))
            elif arg_type == OPT_IGNORE:
                pass
            else:
                self.parser.error(_(u"Invalid argument, an option type is expected, got {type_}:{name}").format(
                                  type_=arg_type, name=arg_name))

    def runCommand(self):
        """run requested command with parsed arguments"""
        if self.args_idx != len(self.args.arguments):
            self.disp(_(u"arguments in input data and in arguments sequence don't match"), error=True)
            self.host.quit(C.EXIT_DATA_ERROR)
        self.disp(A.color(C.A_HEADER, _(u'command {idx}').format(idx=self.idx)), no_lf=not self.args.debug)
        stdin = ''.join(self._stdin)
        if self.args.debug:
            self.disp(A.color(C.A_SUBHEADER, _(u'values: '), A.RESET, u', '.join(self._values_ori)), 2)

            if stdin:
                self.disp(A.color(C.A_SUBHEADER, u'--- STDIN ---'))
                self.disp(stdin.decode('utf-8'))
                self.disp(A.color(C.A_SUBHEADER, u'-------------'))
            self.disp(u'{indent}{prog} {static} {options} {positionals}'.format(
                indent = 4*u' ',
                prog=sys.argv[0],
                static = ' '.join(self.args.command).decode('utf-8'),
                options = u' '.join([o.decode('utf-8') for o in self._opts]),
                positionals = u' '.join([p.decode('utf-8') for p in self._pos])
                ))
            self.disp(u'\n')
        else:
            self.disp(u' (' + u', '.join(self._values_ori) + u')', 2, no_lf=True)
            args = [sys.argv[0]] + self.args.command + self._opts + self._pos
            p = subprocess.Popen(args,
                                  stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
            (stdout, stderr) = p.communicate(stdin)
            log = self.args.log
            log_err = self.args.log_err
            log_tpl = '{command}\n{buff}\n\n'
            if log:
                log.write(log_tpl.format(command=' '.join(args), buff=stdout))
            if log_err:
                log_err.write(log_tpl.format(command=' '.join(args), buff=stderr))
            ret = p.wait()
            if ret == 0:
                self.disp(A.color(C.A_SUCCESS, _(u'OK')))
            else:
                self.disp(A.color(C.A_FAILURE, _(u'FAILED')))

        self.reset()
        self.idx += 1

    def filter(self, filter_type, filter_arg, value):
        """change input value

        @param filter_type(unicode): name of the filter
        @param filter_arg(unicode, None): argument of the filter
        @param value(unicode): value to filter
        @return (unicode, False, None): modified value
            False to skip the whole row
            None to ignore this argument (but continue row with other ones)
        """
        raise NotImplementedError


class Csv(InputCommon):

    def __init__(self, host):
        super(Csv, self).__init__(host, 'csv', _(u'comma-separated values'))

    def add_parser_options(self):
        InputCommon.add_parser_options(self)
        self.parser.add_argument("-r", "--row", type=int, default=0, help=_(u"starting row (previous ones will be ignored)"))
        self.parser.add_argument("-S", "--split", action='append_const', const=('split', None), dest='arguments', help=_(u"split value in several options"))
        self.parser.add_argument("-E", "--empty", action='append', type=self.opt('empty'), dest='arguments',
                                 help=_(u"action to do on empty value ({choices})").format(choices=u', '.join(OPT_EMPTY_CHOICES)))

    def filter(self, filter_type, filter_arg, value):
        if filter_type == 'split':
            return value.split()
        elif filter_type == 'empty':
            if filter_arg == OPT_EMPTY_IGNORE:
                return value if value else None
            elif filter_arg == OPT_EMPTY_SKIP:
                return value if value else False
            else:
                self.parser.error(_(u"--empty value must be one of {choices}").format(choices=u', '.join(OPT_EMPTY_CHOICES)))

        super(Csv, self).filter(filter_type, filter_arg, value)

    def start(self):
        import csv
        reader = csv.reader(sys.stdin)
        for idx, row in enumerate(reader):
            try:
                if idx < self.args.row:
                    continue
                for value in row:
                    self.addValue(value.decode(self.args.encoding))
                self.runCommand()
            except exceptions.CancelError:
                # this row has been cancelled, we skip it
                continue


class Input(base.CommandBase):
    subcommands = (Csv,)

    def __init__(self, host):
        super(Input, self).__init__(host, 'input', use_profile=False, help=_(u'launch command with external input'))