"""Helper functions

Consists of functions to typically be used within templates, but also
available to Controllers. This module is available to both as 'h'.
"""
import random
import hashlib
import StringIO
import urllib

from datetime import datetime
from pygments.formatters import HtmlFormatter
from pygments import highlight as code_highlight
from pylons import url, app_globals as g
from pylons.i18n.translation import _, ungettext

from webhelpers.html import literal, HTML, escape
from webhelpers.html.tools import *
from webhelpers.html.builder import make_tag
from webhelpers.html.tags import auto_discovery_link, checkbox, css_classes, \
    end_form, file, form, hidden, image, javascript_link, link_to, link_to_if, \
    link_to_unless, ol, required_legend, select, stylesheet_link, submit, text, \
    password, textarea, title, ul, xml_declaration, radio
from webhelpers.html.tools import auto_link, button_to, highlight, js_obfuscate, \
    mail_to, strip_links, strip_tags, tag_re
from webhelpers.number import format_byte_size, format_bit_size
from webhelpers.pylonslib import Flash as _Flash
from webhelpers.pylonslib.secure_form import secure_form
from webhelpers.text import chop_at, collapse, convert_accented_entities, \
    convert_misc_entities, lchop, plural, rchop, remove_formatting, \
    replace_whitespace, urlify, truncate, wrap_paragraphs
from webhelpers.date import time_ago_in_words
from webhelpers.paginate import Page
from webhelpers.html.tags import _set_input_attrs, _set_id_attr, \
    convert_boolean_attrs, NotGiven

from vcs.utils.annotate import annotate_highlight
from rhodecode.lib.utils import repo_name_slug
from rhodecode.lib import str2bool, safe_unicode

def _reset(name, value=None, id=NotGiven, type="reset", **attrs):
    """
    Reset button
    """
    _set_input_attrs(attrs, type, name, value)
    _set_id_attr(attrs, id, name)
    convert_boolean_attrs(attrs, ["disabled"])
    return HTML.input(**attrs)

reset = _reset


def get_token():
    """Return the current authentication token, creating one if one doesn't
    already exist.
    """
    token_key = "_authentication_token"
    from pylons import session
    if not token_key in session:
        try:
            token = hashlib.sha1(str(random.getrandbits(128))).hexdigest()
        except AttributeError: # Python < 2.4
            token = hashlib.sha1(str(random.randrange(2 ** 128))).hexdigest()
        session[token_key] = token
        if hasattr(session, 'save'):
            session.save()
    return session[token_key]

class _GetError(object):
    """Get error from form_errors, and represent it as span wrapped error
    message

    :param field_name: field to fetch errors for
    :param form_errors: form errors dict
    """

    def __call__(self, field_name, form_errors):
        tmpl = """<span class="error_msg">%s</span>"""
        if form_errors and form_errors.has_key(field_name):
            return literal(tmpl % form_errors.get(field_name))

get_error = _GetError()

class _ToolTip(object):

    def __call__(self, tooltip_title, trim_at=50):
        """Special function just to wrap our text into nice formatted
        autowrapped text

        :param tooltip_title:
        """

        return wrap_paragraphs(escape(tooltip_title), trim_at)\
                       .replace('\n', '<br/>')

    def activate(self):
        """Adds tooltip mechanism to the given Html all tooltips have to have
        set class `tooltip` and set attribute `tooltip_title`.
        Then a tooltip will be generated based on that. All with yui js tooltip
        """

        js = '''
        YAHOO.util.Event.onDOMReady(function(){
            function toolTipsId(){
                var ids = [];
                var tts = YAHOO.util.Dom.getElementsByClassName('tooltip');

                for (var i = 0; i < tts.length; i++) {
                    //if element doesn't not have and id autogenerate one for tooltip

                    if (!tts[i].id){
                        tts[i].id='tt'+i*100;
                    }
                    ids.push(tts[i].id);
                }
                return ids
            };
            var myToolTips = new YAHOO.widget.Tooltip("tooltip", {
                context: [[toolTipsId()],"tl","bl",null,[0,5]],
                monitorresize:false,
                xyoffset :[0,0],
                autodismissdelay:300000,
                hidedelay:5,
                showdelay:20,
            });

        });
        '''
        return literal(js)

tooltip = _ToolTip()

class _FilesBreadCrumbs(object):

    def __call__(self, repo_name, rev, paths):
        if isinstance(paths, str):
            paths = safe_unicode(paths)
        url_l = [link_to(repo_name, url('files_home',
                                        repo_name=repo_name,
                                        revision=rev, f_path=''))]
        paths_l = paths.split('/')
        for cnt, p in enumerate(paths_l):
            if p != '':
                url_l.append(link_to(p, url('files_home',
                                            repo_name=repo_name,
                                            revision=rev,
                                            f_path='/'.join(paths_l[:cnt + 1]))))

        return literal('/'.join(url_l))

files_breadcrumbs = _FilesBreadCrumbs()

class CodeHtmlFormatter(HtmlFormatter):
    """My code Html Formatter for source codes
    """

    def wrap(self, source, outfile):
        return self._wrap_div(self._wrap_pre(self._wrap_code(source)))

    def _wrap_code(self, source):
        for cnt, it in enumerate(source):
            i, t = it
            t = '<div id="#S-%s">%s</div>' % (cnt + 1, t)
            yield i, t
def pygmentize(filenode, **kwargs):
    """
    pygmentize function using pygments
    :param filenode:
    """
    return literal(code_highlight(filenode.content,
                                  filenode.lexer, CodeHtmlFormatter(**kwargs)))

def pygmentize_annotation(filenode, **kwargs):
    """
    pygmentize function for annotation
    :param filenode:
    """

    color_dict = {}
    def gen_color(n=10000):
        """generator for getting n of evenly distributed colors using
        hsv color and golden ratio. It always return same order of colors

        :returns: RGB tuple
        """
        import colorsys
        golden_ratio = 0.618033988749895
        h = 0.22717784590367374

        for c in xrange(n):
            h += golden_ratio
            h %= 1
            HSV_tuple = [h, 0.95, 0.95]
            RGB_tuple = colorsys.hsv_to_rgb(*HSV_tuple)
            yield map(lambda x:str(int(x * 256)), RGB_tuple)

    cgenerator = gen_color()

    def get_color_string(cs):
        if color_dict.has_key(cs):
            col = color_dict[cs]
        else:
            col = color_dict[cs] = cgenerator.next()
        return "color: rgb(%s)! important;" % (', '.join(col))

    def url_func(changeset):
        tooltip_html = "<div style='font-size:0.8em'><b>Author:</b>" + \
        " %s<br/><b>Date:</b> %s</b><br/><b>Message:</b> %s<br/></div>"

        tooltip_html = tooltip_html % (changeset.author,
                                               changeset.date,
                                               tooltip(changeset.message))
        lnk_format = '%5s:%s' % ('r%s' % changeset.revision,
                                 short_id(changeset.raw_id))
        uri = link_to(
                lnk_format,
                url('changeset_home', repo_name=changeset.repository.name,
                    revision=changeset.raw_id),
                style=get_color_string(changeset.raw_id),
                class_='tooltip',
                title=tooltip_html
              )

        uri += '\n'
        return uri
    return literal(annotate_highlight(filenode, url_func, **kwargs))

def get_changeset_safe(repo, rev):
    from vcs.backends.base import BaseRepository
    from vcs.exceptions import RepositoryError
    if not isinstance(repo, BaseRepository):
        raise Exception('You must pass an Repository '
                        'object as first argument got %s', type(repo))

    try:
        cs = repo.get_changeset(rev)
    except RepositoryError:
        from rhodecode.lib.utils import EmptyChangeset
        cs = EmptyChangeset()
    return cs


flash = _Flash()


#==============================================================================
# MERCURIAL FILTERS available via h.
#==============================================================================
from mercurial import util
from mercurial.templatefilters import person as _person

def _age(curdate):
    """turns a datetime into an age string."""

    if not curdate:
        return ''

    agescales = [("year", 3600 * 24 * 365),
                 ("month", 3600 * 24 * 30),
                 ("day", 3600 * 24),
                 ("hour", 3600),
                 ("minute", 60),
                 ("second", 1), ]

    age = datetime.now() - curdate
    age_seconds = (age.days * agescales[2][1]) + age.seconds
    pos = 1
    for scale in agescales:
        if scale[1] <= age_seconds:
            if pos == 6:pos = 5
            return time_ago_in_words(curdate, agescales[pos][0]) + ' ' + _('ago')
        pos += 1

    return _('just now')

age = lambda  x:_age(x)
capitalize = lambda x: x.capitalize()
email = util.email
email_or_none = lambda x: util.email(x) if util.email(x) != x else None
person = lambda x: _person(x)
short_id = lambda x: x[:12]


def bool2icon(value):
    """Returns True/False values represented as small html image of true/false
    icons

    :param value: bool value
    """

    if value is True:
        return HTML.tag('img', src=url("/images/icons/accept.png"),
                        alt=_('True'))

    if value is False:
        return HTML.tag('img', src=url("/images/icons/cancel.png"),
                        alt=_('False'))

    return value


def action_parser(user_log):
    """
    This helper will map the specified string action into translated
    fancy names with icons and links
    
    @param action:
    """
    action = user_log.action
    action_params = ' '

    x = action.split(':')

    if len(x) > 1:
        action, action_params = x

    def get_cs_links():
        revs_limit = 5
        revs = action_params.split(',')
        cs_links = " " + ', '.join ([link_to(rev, url('changeset_home',
                                repo_name=user_log.repository.repo_name,
                                revision=rev)) for rev in revs[:revs_limit]])
        if len(revs) > revs_limit:
            uniq_id = revs[0]
            html_tmpl = ('<span> %s '
            '<a class="show_more" id="_%s" href="#">%s</a> '
            '%s</span>')
            cs_links += html_tmpl % (_('and'), uniq_id, _('%s more') \
                                        % (len(revs) - revs_limit),
                                        _('revisions'))

            html_tmpl = '<span id="%s" style="display:none"> %s </span>'
            cs_links += html_tmpl % (uniq_id, ', '.join([link_to(rev,
                url('changeset_home',
                repo_name=user_log.repository.repo_name,
                revision=rev)) for rev in revs[revs_limit:] ]))

        return cs_links

    def get_fork_name():
        repo_name = action_params
        return str(link_to(action_params, url('summary_home',
                                          repo_name=repo_name,)))

    map = {'user_deleted_repo':(_('[deleted] repository'), None),
           'user_created_repo':(_('[created] repository'), None),
           'user_forked_repo':(_('[forked] repository as'), get_fork_name),
           'user_updated_repo':(_('[updated] repository'), None),
           'admin_deleted_repo':(_('[delete] repository'), None),
           'admin_created_repo':(_('[created] repository'), None),
           'admin_forked_repo':(_('[forked] repository'), None),
           'admin_updated_repo':(_('[updated] repository'), None),
           'push':(_('[pushed] '), get_cs_links),
           'pull':(_('[pulled] '), None),
           'started_following_repo':(_('[started following] repository'), None),
           'stopped_following_repo':(_('[stopped following] repository'), None),
            }

    action_str = map.get(action, action)
    action = action_str[0].replace('[', '<span class="journal_highlight">')\
                   .replace(']', '</span>')
    action_params_func = lambda :""

    if action_str[1] is not None:
        action_params_func = action_str[1]

    return literal(action + " " + action_params_func())

def action_parser_icon(user_log):
    action = user_log.action
    action_params = None
    x = action.split(':')

    if len(x) > 1:
        action, action_params = x

    tmpl = """<img src="%s%s" alt="%s"/>"""
    map = {'user_deleted_repo':'database_delete.png',
           'user_created_repo':'database_add.png',
           'user_forked_repo':'arrow_divide.png',
           'user_updated_repo':'database_edit.png',
           'admin_deleted_repo':'database_delete.png',
           'admin_created_repo':'database_add.png',
           'admin_forked_repo':'arrow_divide.png',
           'admin_updated_repo':'database_edit.png',
           'push':'script_add.png',
           'push_remote':'connect.png',
           'pull':'down_16.png',
           'started_following_repo':'heart_add.png',
           'stopped_following_repo':'heart_delete.png',
            }
    return literal(tmpl % ((url('/images/icons/')),
                           map.get(action, action), action))


#==============================================================================
# PERMS
#==============================================================================
from rhodecode.lib.auth import HasPermissionAny, HasPermissionAll, \
HasRepoPermissionAny, HasRepoPermissionAll

#==============================================================================
# GRAVATAR URL
#==============================================================================
from pylons import request

def gravatar_url(email_address, size=30):
    ssl_enabled = 'https' == request.environ.get('wsgi.url_scheme')
    default = 'identicon'
    baseurl_nossl = "http://www.gravatar.com/avatar/"
    baseurl_ssl = "https://secure.gravatar.com/avatar/"
    baseurl = baseurl_ssl if ssl_enabled else baseurl_nossl

    if isinstance(email_address, unicode):
        #hashlib crashes on unicode items
        email_address = email_address.encode('utf8', 'replace')
    # construct the url
    gravatar_url = baseurl + hashlib.md5(email_address.lower()).hexdigest() + "?"
    gravatar_url += urllib.urlencode({'d':default, 's':str(size)})

    return gravatar_url

def changed_tooltip(nodes):
    if nodes:
        pref = ': <br/> '
        suf = ''
        if len(nodes) > 30:
            suf = '<br/>' + _(' and %s more') % (len(nodes) - 30)
        return literal(pref + '<br/> '.join([safe_unicode(x.path) for x in nodes[:30]]) + suf)
    else:
        return ': ' + _('No Files')
