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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

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
    """
    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>'
                res += "<span style='color: %s'>" % (number_to_color_names[number])
                opened_elements.append('span')
        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%s' % (num-30,)
        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'))