# -*- coding: utf-8 -*-

priority -50

###########################################################################
#							   General Stuff							  #
###########################################################################
global !p
import vim
from os import path as ospath
from string import Template
import re
from collections import Counter

from vimsnippets import complete

#http://docutils.sourceforge.net/docs/ref/rst/roles.html
TEXT_ROLES = ['emphasis','literal','code','math',
			  'pep-reference','rfc-reference',
			  'strong','subscript','superscript',
			  'title-reference','raw']
TEXT_ROLES_REGEX = r'\.\.\srole::?\s(w+)'

#http://docutils.sourceforge.net/docs/ref/rst/directives.html#specific-admonitions
SPECIFIC_ADMONITIONS = ["attention", "caution", "danger",
						"error", "hint", "important", "note",
						"tip", "warning"]
#http://docutils.sourceforge.net/docs/ref/rst/directives.html
DIRECTIVES = ['topic','sidebar','math','epigraph',
			  'parsed-literal','code','highlights',
			  'pull-quote','compound','container',
			  'list-table','class','sectnum',
			  'role','default-role','unicode',
			  'raw']

NONE_CONTENT_DIRECTIVES = ['rubric', 'contents', 'header',
						   'footer', 'date', 'include', 'title']

INCLUDABLE_DIRECTIVES = ['image', 'figure', 'include']
# CJK chars
# http://stackoverflow.com/questions/2718196/find-all-chinese-text-in-a-string-using-python-and-regex
CJK_RE = re.compile(u'[⺀-⺙⺛-⻳⼀-⿕々〇〡-〩〸-〺〻㐀-䶵一-鿃豈-鶴侮-頻並-龎]', re.UNICODE)


def has_cjk(char):
	"""
	Detect char contains CJK character

	:param char: characters needs to be detect
	"""
	try:
		CJK_RE.finditer(char).next()
	except StopIteration:
		return False
	else:
		return True

def real_filename(filename):
	"""pealeextension name off if possible
	# i.e. "foo.bar.png will return "foo.bar"
	"""
	return ospath.splitext(filename)[0]

def check_file_exist(rst_path, relative_path):
	"""
	For RST file, it can just include files as relative path.

	:param rst_path: absolute path to rst file
	:param relative_path: path related to rst file
	:return: relative file's absolute path if file exist
	"""
	abs_path = ospath.join(ospath.dirname(rst_path), relative_path)
	if ospath.isfile(abs_path):
		return abs_path


try:
	rst_char_len = vim.strwidth  # Requires Vim 7.3+
except AttributeError:
	from unicodedata import east_asian_width
	def rst_char_len(s):
		"""Return the required over-/underline length for s."""
		result = 0
		for c in s:
			result += 2 if east_asian_width(c) in ('W', 'F') else 1
		return result


def	make_items(times, leading='+'):
	"""
	make lines with leading char multitimes

	:param: times, how many times you need
	:param: leading, leading character
	"""
	times = int(times)
	if leading == 1:
		msg = ""
		for x in xrange(1, times+1):
			msg += "%s. Item\n" % x
		return msg
	else:
		return ("%s Item\n" % leading) * times


def look_up_directives(regex, fpath):
	"""
	find all directive args in given file
	:param: regex, the regex that needs to match
	:param: path, to path to rst file

	:return: list, empty list if nothing match
	"""
	try:
		with open(fpath) as source:
			match = re.findall(regex, source.read())
	except IOError:
		match = []
	return match


def get_popular_code_type():
	"""
	find most popular code type in the given rst

	:param path: file to detect

	:return: string, most popular code type in file
	"""
	buf = "".join(vim.current.buffer)
	types = re.findall(r'[:|\.\.\s]code::?\s(\w+)', buf)
	try:
		popular_type = Counter(types).most_common()[0][0]
	except IndexError:
		popular_type = "lua" # Don't break default
	return popular_type
endglobal

snippet part "Part" b
`!p snip.rv = rst_char_len(t[1])*'#'`
${1:Part name}
`!p snip.rv = rst_char_len(t[1])*'#'`

$0
endsnippet

snippet sec "Section" b
${1:Section name}
`!p snip.rv = rst_char_len(t[1])*'='`

$0
endsnippet

snippet ssec "Subsection" b
${1:Section name}
`!p snip.rv = rst_char_len(t[1])*'-'`

$0
endsnippet

snippet sssec "Subsubsection" b
${1:Section name}
`!p snip.rv = rst_char_len(t[1])*'^'`

$0
endsnippet

snippet chap "Chapter" b
`!p snip.rv = rst_char_len(t[1])*'*'`
${1:Chapter name}
`!p snip.rv = rst_char_len(t[1])*'*'`

$0
endsnippet

snippet para "Paragraph" b
${1:Paragraph name}
`!p snip.rv = rst_char_len(t[1])*'"'`

$0
endsnippet

snippet em "Emphasize string" i
`!p
# dirty but works with CJK charactor detection
if has_cjk(vim.current.line):
	snip.rv ="\ "`*${1:${VISUAL:Em}}*`!p
if has_cjk(vim.current.line):
	snip.rv ="\ "
else:
	snip.rv = " "
`$0
endsnippet

snippet st "Strong string" i
`!p
if has_cjk(vim.current.line):
	snip.rv ="\ "`**${1:${VISUAL:Strong}}**`!p
if has_cjk(vim.current.line):
	snip.rv ="\ "
else:
	snip.rv = " "
`$0
endsnippet

snippet "li(st)? (?P<num>\d+)" "List" br
$0
`!p
# usage: li 4<tab>
# which will extand into a unordered list contains 4 items
snip.rv = make_items(match.groupdict()['num'])
`
endsnippet

snippet "ol(st)? (?P<num>\d+)" "Order List" br
$0
`!p
# usage: ol 4<tab>
# which will extand into a ordered list contains 4 items
snip.rv = make_items(match.groupdict()['num'], 1)
`
endsnippet
###########################################################################
#						  More Specialized Stuff.						  #
###########################################################################
snippet cb "Code Block" b
.. code-block:: ${1:`!p snip.rv = get_popular_code_type()`}

	${2:code}

$0
endsnippet

# match snippets :
# img, inc, fig
snippet id "Includable Directives" b
`!p
real_name=real_filename(ospath.basename(t[2]))
di=t[1][:2]

link=""
content=""

if di == 'im':
	link = "|{0}|".format(real_name)

if di == 'fi':
	content="""
	:alt: {0}
	{0}""".format(real_name)
`
..`!p snip.rv = " %s" % link if link else ""` $1`!p snip.rv=complete(t[1], INCLUDABLE_DIRECTIVES)`:: ${2:file}`!p if content:
	snip.rv +="    "+content`
`!p
# Tip of whether file is exist in comment type
if not check_file_exist(path, t[2]):
	snip.rv='.. FILE {0} does not exist'.format(t[2])
else:
	snip.rv=""
`$0
endsnippet

snippet di "Directives" b
.. $1`!p snip.rv=complete(t[1], DIRECTIVES)`:: $2

	${3:Content}
$0
endsnippet

snippet nd "None Content Directives" b
.. $1`!p snip.rv=complete(t[1], NONE_CONTENT_DIRECTIVES)`:: $2
$0
endsnippet

snippet sa "Specific Admonitions" b
.. $1`!p snip.rv =complete(t[1], SPECIFIC_ADMONITIONS)`::

	${2:Content}

$0
endsnippet

#it will be trigger at start of line or after a word
snippet ro "Text Roles" w
\ :$1`!p snip.rv=complete(t[1],
						  TEXT_ROLES+look_up_directives(TEXT_ROLES_REGEX,
														path))`:\`$2\`\
endsnippet

############
#  Sphinx  #
############

snippet sid "SideBar" b
.. sidebar:: ${1:SideBar Title}

	${2:SideBar Content}
endsnippet
# vim:ft=snippets: