# Copyright (c) 2018, George Tokmaji

# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.

# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import sys
import os, re, json, math
import requests, hashlib
from bottle import route, run, Bottle, request, static_file, response, hook, HTTPResponse
from bson.objectid import ObjectId
import threading

os.chdir(os.path.dirname(__file__))

io_lock = threading.Lock()

def loadJSON(name : str) -> dict:
    try:
        with open(name, "r") as fobj:
            return json.load(fobj)
    
    except (FileNotFoundError, json.decoder.JSONDecodeError):
        return {}

def saveJSON(obj : dict, name : str) -> None:
    with io_lock:
        with open(name, "w") as fobj:
            json.dump(obj, fobj)

database = loadJSON("database.json")
if "entries" not in database:
    database["entries"] = {}

def calculateHashForResource(resource : requests.Response, hashobj : object = None) -> object:
    if hashobj is None:
        hashobj = hashlib.sha1()
    
    l = 0
    for block in resource.iter_content(4096):
        l += len(block)
        hashobj.update(block)
    
    if "content-length" not in resource.headers:
        resource.headers["Content-Length"] = l
    return hashobj

def notAllowed():
    raise HTTPResponse(f"Cannot {request.method} {request.path}")