#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os
import re

lily_template = """
\chapter {[[title]]}    
    \lilypondfile{[[scorefile]]}
    ~\\ ~\\
    \input{[[lyricfile]]}
"""

def find_ly_files(path='./scores'):
  lilyfiles = []
  for found_file in os.listdir(path):
    if found_file.endswith(".ly"):
      filepath = os.path.join(path, found_file)
      lilyfiles.append(filepath)
  
  return lilyfiles
  
def build_songmap(lilyfiles, lyric_folder='./lyrics'):
  songmap = []
  for scorefile in lilyfiles:
    filename_with_ext = os.path.basename(scorefile)
    filename = os.path.splitext(filename_with_ext)[0]
    lyricfile = os.path.join(lyric_folder, "{0}.tex".format(filename))
    
    title = find_title(scorefile)
    
    songmap.append({'scorefile': scorefile, 'lyricfile': lyricfile, 'title': title })  

  return songmap

def find_title(scorefile):
  with open(scorefile) as opened_file:
    score = opened_file.read()
    title = re.findall('title = "(.*)"', score)
    
    return title[0]

def build_lytex(base_template, songmap):
  lilychapters = []
  for song in sorted(songmap, key=lambda k: k['scorefile']):    
    lilychapter = lily_template.replace('[[title]]', song['title'])
    lilychapter = lilychapter.replace('[[scorefile]]', song['scorefile'])
    lilychapter = lilychapter.replace('[[lyricfile]]', song['lyricfile'])
    
    lilychapters.append(lilychapter)
  
  lilychapters_string = create_lilychapter_string(lilychapters)  
  
  with open(base_template) as opened_file:
    template = opened_file.read()
    template = template.replace('\\musicbooklet', lilychapters_string)
    
    return template

def create_lilychapter_string(lilychapters):
  lilychapter_string = ''
  for lilychapter in lilychapters:
    lilychapter_string += '{0}\n'.format(lilychapter)
  
  return lilychapter_string      
  
lilyfiles = find_ly_files()    
songmap = build_songmap(lilyfiles)
lytex_source = build_lytex('singalongs.tex', songmap)

print(lytex_source)