#!/usr/bin/env python
# (c) 2012, Jan-Piet Mens <jpmens () gmail.com>
#
# This file is part of Ansible
#
# Ansible 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, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
#

import os
import sys
import yaml
import codecs
import json
import ast
from jinja2 import Environment, FileSystemLoader
import re
import optparse
import time
import datetime
import subprocess

# modules that are ok that they do not have documentation strings
BLACKLIST_MODULES = [
   'async_wrapper'
]

# Get parent directory of the directory this script lives in
MODULEDIR=os.path.abspath(os.path.join(
    os.path.dirname(os.path.realpath(__file__)), os.pardir, 'library'
    ))
EXAMPLE_YAML=os.path.abspath(os.path.join(
    os.path.dirname(os.path.realpath(__file__)), os.pardir, 'examples', 'DOCUMENTATION.yaml'
    ))

# There is a better way of doing this!
# TODO: somebody add U(text, http://foo.bar/) as described by Tim in #991

_ITALIC = re.compile(r"I\(([^)]+)\)")
_BOLD   = re.compile(r"B\(([^)]+)\)")
_MODULE = re.compile(r"M\(([^)]+)\)")
_URL    = re.compile(r"U\(([^)]+)\)")
_CONST  = re.compile(r"C\(([^)]+)\)")

def latex_ify(text):

    t = _ITALIC.sub("\\I{" + r"\1" + "}", text)
    t = _BOLD.sub("\\B{" + r"\1" + "}", t)
    t = _MODULE.sub("\\M{" + r"\1" + "}", t)
    t = _URL.sub("\\url{" + r"\1" + "}", t)
    t = _CONST.sub("\\C{" + r"\1" + "}", t)

    return t

def html_ify(text):

    t = _ITALIC.sub("<em>" + r"\1" + "</em>", text)
    t = _BOLD.sub("<b>" + r"\1" + "</b>", t)
    t = _MODULE.sub("<span class='module'>" + r"\1" + "</span>", t)
    t = _URL.sub("<a href='" + r"\1" + "'>" + r"\1" + "</a>", t)
    #t = _CONST.sub("<code>" + r"\1" + "</code>", t)
    t = _CONST.sub(r"\1", t)
    return t

def json_ify(text):

    t = _ITALIC.sub("<em>" + r"\1" + "</em>", text)
    t = _BOLD.sub("<b>" + r"\1" + "</b>", t)
    t = _MODULE.sub("<span class='module'>" + r"\1" + "</span>", t)
    t = _URL.sub("<a href='" + r"\1" + "'>" + r"\1" + "</a>", t)
    t = _CONST.sub("<code>" + r"\1" + "</code>", t)

    return t


def js_ify(text):

    return text


def man_ify(text):

    t = _ITALIC.sub(r'\\fI' + r"\1" + r"\\fR", text)
    t = _BOLD.sub(r'\\fB' + r"\1" + r"\\fR", t)
    t = _MODULE.sub(r'\\fI' + r"\1" + r"\\fR", t)
    t = _URL.sub(r'\\fI' + r"\1" + r"\\fR", t)
    t = _CONST.sub(r'\\fC' + r"\1" + r"\\fR", t)

    return t

def rst_ify(text):

    t = _ITALIC.sub(r'*' + r"\1" + r"*", text)
    t = _BOLD.sub(r'**' + r"\1" + r"**", t)
    # mdehaan is disabling because he finds all the Sphinx orange distracting
    #t = _MODULE.sub(r'``' + r"\1" + r"``", t)
    t = _MODULE.sub(r"\1", t)
    t = _URL.sub(r"\1", t)
    # ditto
    # t = _CONST.sub(r'``' + r"\1" + r"``", t)
    t = _CONST.sub(r"\1", t)

    return t

def markdown_ify(text):

    t = _ITALIC.sub("_" + r"\1" + "_", text)
    t = _BOLD.sub("**" + r"\1" + "**", t)
    t = _MODULE.sub("*" + r"\1" + "*", t)
    t = _URL.sub("[" + r"\1" + "](" + r"\1" + ")", t)
    t = _CONST.sub("`" + r"\1" + "`", t)

    return t

# Helper for Jinja2 (format() doesn't work here...)
def rst_fmt(text, fmt):
    return fmt % (text)

def rst_xline(width, char="="):
    return char * width

def load_examples_section(text):
    return text.split('***BREAK***')

def get_docstring(filename, verbose=False):
    """
    Search for assignment of the DOCUMENTATION variable in the given file.
    Parse that from YAML and return the YAML doc or None.
    """

    doc = None

    try:
        # Thank you, Habbie, for this bit of code :-)
        M = ast.parse(''.join(open(filename)))
        for child in M.body:
            if isinstance(child, ast.Assign):
                if 'DOCUMENTATION' in (t.id for t in child.targets):
                    doc = yaml.load(child.value.s)

    except:
        if verbose:
            raise
        else:
            print "unable to parse %s" % filename

    return doc


def return_data(text, options, outputname, module):
    if options.output_dir is not None:
        f = open(os.path.join(options.output_dir, outputname % module), 'w')
        f.write(text)
        f.close()
    else:
        print text

def boilerplate():
    if not os.path.exists(EXAMPLE_YAML):
        print >>sys.stderr, "Missing example boiler plate: %S" % EXAMPLE_YAML
    print file(EXAMPLE_YAML).read()


def main():

    p = optparse.OptionParser(
        version='%prog 1.0',
        usage='usage: %prog [options] arg1 arg2',
        description='Convert Ansible module DOCUMENTATION strings to other formats',
    )

    p.add_option("-A", "--ansible-version",
            action="store",
            dest="ansible_version",
            default="unknown",
            help="Ansible version number")
    p.add_option("-M", "--module-dir",
            action="store",
            dest="module_dir",
            default=MODULEDIR,
            help="Ansible modules/ directory")
    p.add_option("-T", "--template-dir",
            action="store",
            dest="template_dir",
            default="hacking/templates",
            help="directory containing Jinja2 templates")
    p.add_option("-t", "--type",
            action='store',
            dest='type',
            choices=['html', 'latex', 'man', 'rst', 'json', 'markdown'],
            default='latex',
            help="Output type")
    p.add_option("-m", "--module",
            action='append',
            default=[],
            dest='module_list',
            help="Add modules to process in module_dir")
    p.add_option("-v", "--verbose",
            action='store_true',
            default=False,
            help="Verbose")
    p.add_option("-o", "--output-dir",
            action="store",
            dest="output_dir",
            default=None,
            help="Output directory for module files")
    p.add_option("-I", "--includes-file",
            action="store",
            dest="includes_file",
            default=None,
            help="Create a file containing list of processed modules")
    p.add_option("-G", "--generate",
            action="store_true",
            dest="do_boilerplate",
            default=False,
            help="generate boilerplate DOCUMENTATION to stdout")
    p.add_option('-V', action='version', help='Show version number and exit')

    (options, args) = p.parse_args()

#    print "M: %s" % options.module_dir
#    print "t: %s" % options.type
#    print "m: %s" % options.module_list
#    print "v: %s" % options.verbose

    if options.do_boilerplate:
        boilerplate()
        sys.exit(0)

    if not options.module_dir:
        print "Need module_dir"
        sys.exit(1)
    if not os.path.exists(options.module_dir):
        print >>sys.stderr, "Module directory does not exist: %s" % options.module_dir
        sys.exit(1)


    if not options.template_dir:
        print "Need template_dir"
        sys.exit(1)

    env = Environment(loader=FileSystemLoader(options.template_dir),
        variable_start_string="@{",
        variable_end_string="}@",
        trim_blocks=True,
        )

    env.globals['xline'] = rst_xline

    if options.type == 'latex':
        env.filters['jpfunc'] = latex_ify
        template = env.get_template('latex.j2')
        outputname = "%s.tex"
        includecmt = "% generated code\n"
        includefmt = "\\input %s\n"
    if options.type == 'html':
        env.filters['jpfunc'] = html_ify
        template = env.get_template('html.j2')
        outputname = "%s.html"
        includecmt = ""
        includefmt = ""
    if options.type == 'man':
        env.filters['jpfunc'] = man_ify
        template = env.get_template('man.j2')
        outputname = "ansible.%s.3"
        includecmt = ""
        includefmt = ""
    if options.type == 'rst':
        env.filters['jpfunc'] = rst_ify
        env.filters['html_ify'] = html_ify
        env.filters['fmt'] = rst_fmt
        env.filters['xline'] = rst_xline
        template = env.get_template('rst.j2')
        outputname = "%s.rst"
        includecmt = ".. Generated by module_formatter\n"
        includefmt = ".. include:: modules/%s.rst\n"
    if options.type == 'json':
        env.filters['jpfunc'] = json_ify
        outputname = "%s.json"
        includecmt = ""
        includefmt = ""
    if options.type == 'js':
        env.filters['jpfunc'] = js_ify
        template = env.get_template('js.j2')
        outputname = "%s.js"
    if options.type == 'markdown':
        env.filters['jpfunc'] = markdown_ify
        env.filters['html_ify'] = html_ify
        template = env.get_template('markdown.j2')
        outputname = "%s.md"
        includecmt = ""
        includefmt = ""

    if options.includes_file is not None and includefmt != "":
        incfile = open(options.includes_file, "w")
        incfile.write(includecmt)

    # Temporary variable required to genrate aggregated content in 'js' format.
    js_data = []
    for module in sorted(os.listdir(options.module_dir)):
        if len(options.module_list):
            if not module in options.module_list:
                continue

        fname = os.path.join(options.module_dir, module)
        extra = os.path.join("inc", "%s.tex" % module)

        if fname.endswith(".swp"):
            continue

        print " processing module source ---> %s" % fname

        if options.type == 'js':
            if fname.endswith(".json"):
                f = open(fname)
                j = json.load(f)
                f.close()
                js_data.append(j)
            continue

        doc = get_docstring(fname, verbose=options.verbose)

        if doc is None and module not in BLACKLIST_MODULES:
            sys.stderr.write("*** ERROR: CORE MODULE MISSING DOCUMENTATION: %s ***\n" % module)
            #sys.exit(1)

        if not doc is None:

            doc['filename']         = fname
            doc['docuri']           = doc['module'].replace('_', '-')
            doc['now_date']         = datetime.date.today().strftime('%Y-%m-%d')
            doc['ansible_version']  = options.ansible_version

            if options.includes_file is not None and includefmt != "":
                incfile.write(includefmt % module)

            if options.verbose:
                print json.dumps(doc, indent=4)


            if options.type == 'latex':
                if os.path.exists(extra):
                    f = open(extra)
                    extradata = f.read()
                    f.close()
                    doc['extradata'] = extradata

            if options.type == 'json':
                text = json.dumps(doc, indent=2)
            else:
                text = template.render(doc)

            return_data(text, options, outputname, module)

    if options.type == 'js':
        docs = {}
        docs['json'] = json.dumps(js_data, indent=2)
        text = template.render(docs)
        return_data(text, options, outputname, 'modules')

if __name__ == '__main__':
    main()