#!/usr/bin/env python3
import jinja2
import sys
import os
import json
import getopt
import csv

template_dir = ''
jinja_env = None
dev = False

def load_template(input_file):
  return jinja_env.get_template(input_file)

def load_csv_values(csv_file,csv_params):
  with open(csv_file, newline='') as f:
    reader = csv.DictReader(f,**csv_params)
    data = []
    for row in reader:
      data.append(row)
    return {'fieldnames': reader.fieldnames, 'data': data}

def write_page(output_file,text):
  with open(output_file,'w') as f:
    f.write(text)

def usage():
  print('Usage: python3 cuack.py\n')

def parse_args():
  global dev
  inputFile = ""
  try:
    opts, args = getopt.getopt(sys.argv[1:],'f:h:d',['file=','help','dev'])
  except getopt.GetOptError as err:
    print(err,file=sys.stderr)
    usage()
    sys.exit(2)
  for opt , arg in opts:
    if opt in ('-h','--help'):
      usage()
      sys.exit()
    elif opt in ('-f','--file'):
      inputFile = arg
    elif opt in ('-d','--dev'):
      dev = True
  if inputFile == '':
    inputFile = 'pages.json'
  with open(inputFile,'r') as f:
    conf = f.read()
  return json.loads(conf) 

def main(argv):
  global jinja_env
  global template_dir
  global dev
  global_vars = {}
  json_conf = parse_args()
  template_dir = os.path.join(os.path.dirname(__file__),json_conf['template_dir'])
  jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir),autoescape= True)
  jinja_env.add_extension('jinja2.ext.loopcontrols')

  pages = json_conf['pages']
  for page in pages:
    template = load_template(page['template'])
    if 'csv' in page:
      for csv_conf in page['csv']:
        csv_data = load_csv_values(csv_conf['file_name'],csv_conf['csv_params'])
        page[csv_conf['var_name']] = csv_data
    if 'global_vars' in json_conf:
      global_vars = json_conf['global_vars'] 
    result= template.render(name=page['name'],dev= dev,meta= pages,global_vars= global_vars,current_page = page)
    write_page(json_conf['output_dir']+ '/' + page['name'],result)

if __name__ == '__main__':
  main(sys.argv)