import shutil
import syslog
import os
import traceback

"""
Preparations to start web2py on later set readonly filesystem.
"""
__author__ = 'frank.sattelberger@bittwister.com'


CONFIG_PATH = """/mnt/data/log/web2pylnksrcs/"""
OLD_CONFIG_PATH = """/home/tool/config/web2pylnksrcs/"""
WEB2PY = """/home/tool/web2py/"""


def create_lnks(source, target, paths):
    try:
        if os.path.exists(OLD_CONFIG_PATH):
            shutil.rmtree(OLD_CONFIG_PATH)
        for path in paths:
            current_config_path = source + path
            current_web2py_path = target + path

            if not os.path.exists(target):
                os.makedirs(target)

            if not os.path.exists(current_web2py_path):
                if not os.path.exists(current_config_path):
                    os.makedirs(current_config_path)
                #if os.path.exists(current_web2py_path):
                #    shutil.rmtree(current_web2py_path)
                #print("Create symlink", current_config_path, current_web2py_path)
                syslog.syslog(syslog.LOG_INFO, "symlnk  {0} {1}".format(current_config_path, current_web2py_path))
                os.symlink(current_config_path, current_web2py_path)
    except:
        syslog.syslog(syslog.LOG_ERR, traceback.format_exc())


def prepare_for_web2py_start():
    paths = ('deposit', 'site-packages', 'logs')    # removed: 'applications', [that's no link!]
    create_lnks(CONFIG_PATH + """web2pyroot/""", WEB2PY, paths)
    appl_paths = ('cache', 'models', 'views', 'controllers', 'databases', 'modules', 'cron', 'errors', 'sessions',
                  'languages', 'static', 'private', 'uploads')

    for app in ('''BS350/''', '''admin/'''):
        create_lnks(CONFIG_PATH + app, WEB2PY + "applications/" + app, appl_paths)