#!/usr/bin/env python
# Scan the osm-vector directory, update the osm-vector-idx.json, add menu-defs

from geojson import Feature, Point, FeatureCollection, Polygon
import geojson
import json
import os
import sys
import fnmatch
import re

#IIAB_PATH='{{ iiab_dir }}'
IIAB_PATH='/etc/iiab'
if not IIAB_PATH in sys.path:
    sys.path.append(IIAB_PATH)
from iiab_env import get_iiab_env

SCRIPT_DIR = '/opt/admin/cmdsrv/scripts'
if not SCRIPT_DIR in sys.path:
    sys.path.append(SCRIPT_DIR)
import iiab_update_menus as update_menus

doc_root = get_iiab_env('WWWROOT')
menuDefs = doc_root + "/js-menu/menu-files/menu-defs/"
osm_vector_idx_dir = doc_root + "/common/assets/"
map_doc_root = '/library/osm-vector'
# map_catalog will be global, assumed always available
map_catalog = {}
map_menu_defs ={}

def main():
   global map_menu_defs
   get_map_catalog()
   #print(json.dumps(map_catalog,indent=2))
   map_menu_defs = get_menu_def_names()
   #print(json.dumps(map_menu_defs,indent=2))
   installed_maps = get_installed_maps()
   print(installed_maps)
   write_osm_vector_idx(installed_maps)

def get_map_catalog():
   global map_catalog
   #input_json = "{{ iiab_dir }}" + '/regions.json'
   input_json = "/etc/iiab" + '/regions.json'
   with open(input_json,'r') as regions:
      reg_str = regions.read()
      map_catalog = json.loads(reg_str)
   #print(json.dumps(map_catalog,indent=2))

def get_menu_def_names(intended_use='map'):
   menu_def_dict = {}
   os.chdir(menuDefs)
   for filename in os.listdir('.'):
      if fnmatch.fnmatch(filename, '*.json'):
         try:
            with open(filename,'r') as json_file:
                readstr = json_file.read()
                data = json.loads(readstr)
         except:
            print("failed to parse %s"%filename)
            print(readstr)
         if data.get('intended_use','') != intended_use:
            continue
         map_name = data.get('name','')
         if map_name != '':
            menu_def_dict[data['name']] = menuDefs + filename
   return menu_def_dict

def get_installed_maps():
   installed = []
   os.chdir(map_doc_root)
   for filename in os.listdir('.'):
      if fnmatch.fnmatch(filename, '??-osm-omt*'):
         print filename
         region = re.sub(r'^..-osm-omt_(.*)',r'\1',filename)
         print(region)
         installed.append(region)
   return installed

def write_osm_vector_idx(installed_maps):
   map_list = []
   for map in installed_maps:
      data_dict = map_catalog['regions'].get(map,'')
      map_list.append(data_dict)
   print(map,data_dict)

def create_menu_def(perma_ref,default_name,intended_use='map'):
   if default_name.find('.') > -1:
       default_name = default_name[:-5].replace('.','_') + '.json'
   item = map_catalog[perma_ref]
   if len(item.get('language','')) > 2:
     lang = item['language'][:2]
   else: # default to english
     lang = 'en'
   filename = lang + '-' + perma_ref + '.json'
   # create a stub for this zim
   menuDef = {}
   default_logo = get_default_logo(perma_ref,lang)
   menuDef["intended_use"] = "map"
   menuDef["lang"] = lang
   menuDef["logo_url"] = default_logo
   menuitem = lang + '-' + perma_ref
   menuDef["menu_item_name"] = default_name[:-5]
   menuDef["title"] = item.get('title','')
   menuDef["zim_name"] = perma_ref
   menuDef["start_url"] = ''
   menuDef["description"] = '<p>' + item.get('description','') + '</p>'
   menuDef["description"] += '<p>Size: ##SIZE##, Articles: ##ARTICLE_COUNT##, Media: ##MEDIA_COUNT##, Tags; [##tags##], Language: ##language##, Date: ##zim_date##</p>'
   menuDef["extra_html"] = ""
   menuDef["automatically_generated"] = "true"
   if not os.path.isfile(menuDefs + default_name): # logic to here can still overwrite existing menu def
       print("creating %s"%menuDefs + default_name)
       with open(menuDefs + default_name,'w') as menufile:
          menufile.write(json.dumps(menuDef,indent=2))
   return default_name[:-5]

def human_readable(num):
    # return 3 significant digits and unit specifier
    num = float(num)
    units = [ '','K','M','G']
    for i in range(4):
        if num<10.0:
            return "%.2f%s"%(num,units[i])
        if num<100.0:
            return "%.1f%s"%(num,units[i])
        if num < 1000.0:
            return "%.0f%s"%(num,units[i])
        num /= 1000.0

if __name__ == '__main__':
   main()