from datetime import datetime
import json
import shlex

from django import template
from django.utils.safestring import mark_safe
from django.utils.timesince import timesince
from misaka import Markdown, HtmlRenderer, EXT_SUPERSCRIPT, EXT_FENCED_CODE, EXT_AUTOLINK

from main.models import Job

register = template.Library()

@register.filter(name='markdown')
def markdown_filter(value):
    """ Convert markdown content into HTML. """
    renderer = HtmlRenderer()
    markdown = Markdown(
            renderer,
            extensions=EXT_SUPERSCRIPT | EXT_FENCED_CODE )
    return markdown.render(value)


@register.filter(name='email2name')
def email2name(email):
    """ Convert INRIA/IRISA emails into firstname name pattern
    """
    value = email.split('@')
    if '.' in value[0]:
        data = value[0].split('.')
        contact = data[0] + ' ' + data[1]
        return email2name(contact.title())
    else:
        return value[0].capitalize()


@register.filter(name='fancy_webapp_name')
def fancy_name(webapp_name):
    """ Replace underscores by spaces """
    return webapp_name.replace('_', ' ')

@register.filter(name='fancy_job_queue')
def fancy_job_queue(queue):
    """Display the queue name with its timeout (if any)"""
    if queue.timeout is None:
        return queue.name
    if queue.timeout < 60:
        return "%s (<%d seconds)" % (queue.name, queue.timeout)
    else:
        return "%s (<%s)" % (queue.name, timesince(
            datetime.fromtimestamp(0),
            datetime.fromtimestamp(queue.timeout)))






_JOB_STATUS_RENDER_VALUES = {
        "NEW":      ("New job",         "fas fa-plus  picto-green"),
        "WAITING":  ("Waiting job",     "fas fa-clock picto-yellow"),
        "RUNNING":  ("Job running",     "fas fa-spinner fa-pulse picto-blue"),
        "ABORTING": ("Job aborting",    "fas fa-spinner fa-pulse picto-yellow"),
        "SUCCESS":  ("Job success",     "fas fa-check picto-green"),
        "ERROR":    ("Job error",       "fas fa-times picto-red"),
        "ABORTED":  ("Job aborted",     "fas fa-hand-paper picto-orange"),
        "TIMEOUT":  ("Job timeout",     "fas fa-stopwatch picto-orange"),
        }

@register.filter(name='status_icon')
def status_icon(obj):
    """ Renders a status icon for a model """

    def render_job_status(status):
        txt, cls = _JOB_STATUS_RENDER_VALUES.get(status,
                ("Unknown status", "fas fa-question"))
        return ('<i class="{cls}" data-toggle="tooltip" data-placement="top"'
                ' title="{txt}"></i><span class="text-hide">{txt}</span>'
                .format(txt=txt, cls=cls))

    if isinstance(obj, Job):
        return mark_safe(render_job_status(obj.status))
    elif obj == "job-status-dict":
        return json.dumps({status: render_job_status(status)
            for status in _JOB_STATUS_RENDER_VALUES})

    raise TypeError(type(obj))


@register.filter(name='command_multiline')
def command_multiline(cmd):
    """Format a shell command over multiple lines (for display)

    `cmd` is the command to be formatted, provided as a list of strings (the
    actual arguments) or the `None` value (for inserting a newline).
    """

    lst = []
    sep = ""
    for arg in cmd:
        if arg is None:
            sep = "\n  "
        else:
            lst.append(sep)
            lst.append(shlex.quote(arg))
            sep = " "
    return "".join(lst)

@register.filter(name='command_oneline')
def command_oneline(cmd):
    """Format a shell command as a single line (for the clipboard)

    `cmd` is the command to be formatted, provided as a list of strings (the
    actual arguments) or the `None` value (for inserting a newline).

    This converter ignores the `None` elements, thus the command is formatted
    as a single line.
    """
    return " ".join(shlex.quote(arg) for arg in cmd if arg is not None)