#!/usr/bin/env python
"""Usage: bupa <filename>

Options:
  -h --help     Show this screen.
"""
from jinja2 import Environment, FileSystemLoader
import os, yaml, docopt

from docutils import core
from docutils.writers.html4css1 import Writer

def reST_to_html(s):
	return core.publish_parts(s, writer_name='html4css1')['html_body']

def filename_to_id(file_name):
	return int(file_name.split('/')[-1].
	                     split('-')[0].
	                     split('.')[0])

class Entry(object):
	def __init__(self, entry_dict):
		self.id = None
		self.title = entry_dict['title']
		self.date = entry_dict['date']
		self.author = entry_dict['author']
		if 'author_link' in entry_dict:
			self.author_link = entry_dict['author_link']
		self.body = entry_dict['body'][0]

def parse(filename):
	with open(filename, 'r') as file:
		data = file.read()

	frontmatter, *body = data.split('\n\n', 1)
	frontmatter = frontmatter.partition('\n')[2]
	frontmatter = yaml.load(frontmatter)

	entry_dict = frontmatter.copy()
	entry_dict['body'] = body

	entry = Entry(entry_dict)
	return entry

def build_journal(env):
	template = env.get_template('journal.html')

	files = os.listdir('src/journal')
	files.sort(key=filename_to_id, reverse=True)

	entries = []
	for file in files:
		entry = parse('src/journal/' + file)
		entry.body = reST_to_html(entry.body)
		entry.id = filename_to_id(file)
		entries += [entry]

	with open('build/journal.html', 'w') as file:
		file.write(template.render(entries=entries, title='~/journal'))

def build_index(env):
	template = env.get_template('page.html')

	page = parse('src/index.rst')
	page.body = reST_to_html(page.body)
	page.article_id = 'index'

	with open('build/index.html', 'w') as file:
		file.write(template.render(page=page, title=page.title))

def build_about(env):
	template = env.get_template('page.html')

	page = parse('src/about.rst')
	page.body = reST_to_html(page.body)
	page.article_id = 'about'

	with open('build/about.html', 'w') as file:
		file.write(template.render(page=page, title='~/about'))

def main():
	arguments = docopt.docopt(__doc__)
	env = Environment(loader=FileSystemLoader('src/templates'))

	if arguments['<filename>'] == 'journal.html':
		build_journal(env)
	elif arguments['<filename>'] == 'index.html':
		build_index(env)
	elif arguments['<filename>'] == 'about.html':
		build_about(env)

if __name__ == '__main__':
	main()