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#!/usr/bin/env python3
#
# Copyright 2010-2011 Le Coz Florent <louiz@louiz.org>
#
# This file is part of Poezio.
#
# Poezio is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# Poezio 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Poezio.  If not, see <http://www.gnu.org/licenses/>.

"""
Various methods to convert
shell colors to poezio colors,
xhtml code to shell colors,
poezio colors to xhtml code
"""

import re
import subprocess

from config import config
import logging

log = logging.getLogger(__name__)

shell_colors_re = re.compile(r'(\[(?:\d+;)*(?:\d+m))')
start_indent_re = re.compile(r'\[0;30m\[0;37m   ')
newline_indent_re = re.compile('\n\[0;37m   ')

def get_body_from_message_stanza(message):
    """
    Returns a string with xhtml markups converted to
    poezio colors if there's an xhtml_im element, or
    the body (without any color) otherwise
    """
    if config.get('enable_xhtml_im', 'false') == 'true':
        xhtml_body = message['xhtml_im']
        if xhtml_body:
            try:
                shell_body = xhtml_code_to_shell_colors(xhtml_body)
            except OSError:
                log.error('html parsing failed')
            else:
                return shell_colors_to_poezio_colors(shell_body)
    return message['body']

def clean_text(string):
    """
    Remove all \x19 from the string
    """
    pos = string.find('\x19')
    while pos != -1:
        string = string[:pos] + string[pos+2:]
        pos = string.find('\x19')
    return string

number_to_color_names = {
    1: 'red',
    2: 'green',
    3: 'yellow',
    4: 'blue',
    5: 'violet',
    6: 'turquoise',
    7: 'white'
}

def poezio_colors_to_html(string):
    """
    Convert poezio colors to html makups
    (e.g. \x191: <span style='color: red'>)
    """
    # TODO underlined

    # a list of all opened elements, e.g. ['strong', 'span']
    # So that we know what we need to close
    opened_elements = []
    res = "<body xmlns='http://www.w3.org/1999/xhtml'><p>"
    next_attr_char = string.find('\x19')
    while next_attr_char != -1:
        attr_char = string[next_attr_char+1].lower()
        if next_attr_char != 0:
            res += string[:next_attr_char]
        string = string[next_attr_char+2:]
        if attr_char == 'o':
            for elem in opened_elements[::-1]:
                res += '</%s>' % (elem,)
            opened_elements = []
        elif attr_char == 'b':
            if 'strong' not in opened_elements:
                opened_elements.append('strong')
                res += '<strong>'
        elif attr_char.isdigit():
            number = int(attr_char)
            if number in number_to_color_names:
                if 'span' in opened_elements:
                    res += '</span>'
                else:
                    opened_elements.append('span')
                res += "<span style='color: %s'>" % (number_to_color_names[number])
        next_attr_char = string.find('\x19')
    res += string
    for elem in opened_elements[::-1]:
        res += '</%s>' % (elem,)
    res += "</p></body>"
    return res.replace('\n', '<br />')

def shell_colors_to_poezio_colors(string):
    """
    'shell colors' means something like:

    Bonjour ^[[0;32msalut^[[0m

    The current understanding of this syntax is:
    n = 0: reset all attributes to defaults
    n = 1: activate bold
    n >= 30 and n <= 37: set the foreground to n-30

    """
    def repl(matchobj):
        exp = matchobj.group(0)[2:-1]
        numbers = [int(nb) for nb in exp.split(';')]
        res = ''
        for num in numbers:
            if num == 0:
                res += '\x19o'
            elif num == 1:
                res += '\x19b'
            elif num >= 31 and num <= 37:
                res += '\x19%d' % ((num-30)%7,)
        return res
    def remove_elinks_indent(string):
        lines = string.split('\n')
        for i, line in enumerate(lines):
            lines[i] = re.sub('   ', '', line, 1)
        return '\n'.join(lines)
    res = shell_colors_re.sub(repl, string).strip()
    res = remove_elinks_indent(res)
    return res

def xhtml_code_to_shell_colors(string):
    """
    Use a console browser to parse the xhtml and
    make it return a shell-colored string
    """
    process = subprocess.Popen(["elinks", "-dump", "-dump-color-mode", "2"], stdout=subprocess.PIPE, stdin=subprocess.PIPE)
    result = process.communicate(input=string.encode('utf-8'))[0]
    return result.decode('utf-8').strip()

def poezio_colors_to_xhtml(string):
    """
    Generate a valid xhtml string from
    the poezio colors in the given string
    """
    res = "<body xmlns='http://www.w3.org/1999/xhtml'>"
    next_attr_char = string.find('\x19')
    open_elements = []
    while next_attr_char != -1:
        attr_char = string[next_attr_char+1].lower()
        if next_attr_char != 0:
            res += string[:next_attr_char]
        string = string[next_attr_char+2:]
        if attr_char == 'o':
            # close all opened elements
            for elem in open_elements:
                res += '</%s>'
            open_elements = []
        elif attr_char == 'b':
            if 'strong' not in open_elements:
                res += '<strong>'
                open_elements.append('strong')
        elif attr_char.isdigit():
            self._win.attron(common.curses_color_pair(int(attr_char)))
        next_attr_char = string.find('\x19')

if __name__ == '__main__':
#     print(xhtml_code_to_shell_colors("""
#   <html xmlns='http://jabber.org/protocol/xhtml-im'>
#     <body xmlns='http://www.w3.org/1999/xhtml'>
#       <p style='font-size:large'>
#         <em>Wow</em>, I&apos;m <span style='color:green'>green</span>
#         with <strong>envy</strong>!
#       </p>
#     </body>
#   </html>
# """))
    print(poezio_colors_to_html('\x191red\x19o \x192green\x19o \x19b\x192green and bold'))