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

import os,sys
import json
from datetime import datetime
from flask import Flask, render_template, jsonify, \
    redirect, url_for, request, g, session, send_from_directory
from werkzeug.utils import secure_filename
import hashlib
from revprox import ReverseProxied

app = Flask(__name__)
app.config.from_object(__name__)
# Read config from json !
app.config['UPLOAD_FOLDER'] = 'data/'
app.config['SHARES_FILE'] = 'data/shares.json'
app.config['DATE_FORMAT'] = "%Y-%m-%d %H:%M"
app.config['UID'] = 1000

app.secret_key = 'Cz2dw5NiRt3PSMFBSLTAJJi7U2CdW7iPQqEeOaU6'
app.wsgi_app = ReverseProxied(app.wsgi_app)

@app.before_request
def before_request():
    g.shares = json.load(open(app.config['SHARES_FILE'],'rt'))

@app.route("/")
def index():
    printerr(g.shares)
    public_shares = []
    for share in g.shares:
        public = get_or_none(share,'public')
        expired = is_expired(share)
        if public and not expired:
            public_shares.append({
                'name': share['name'],
                'expire': get_or_none(share,'expire'),
                'upload': get_or_none(share,'upload')
            })

    return render_template("index.html", entries=public_shares)

@app.route('/authenticate/<name>', methods=['GET','POST'])
def authenticate(name):
    if request.method == 'GET':
        return render_template('authenticate.html',name=name)
    if request.method == 'POST':
        user_password = request.form['password'].encode('utf-8')
        session[name] = hashlib.sha256(user_password).hexdigest()
        return redirect(url_for('list_view',name=name))

@app.route('/upload', methods=['POST'])
def upload():
    if request.method == 'POST':
        file = request.files['file']
        name = request.form['name']
        (ok,share) = get_share(name)
        if not ok:
            return share
        if file:
            filename = os.path.join(
                share['path'],
                secure_filename(
                    file.filename
                )
            )
            file.save(filename)
            os.chown(filename, app.config['UID'], -1)
            return redirect(url_for('list_view',name=name))

@app.route('/send/<name>', methods=['GET'])
def send(name):
    (ok,share) = get_share(name)
    if not ok:
        return share
    return render_template('send.html',name=name)

@app.route('/list/<name>', methods=['GET'])
def list_view(name):
    (ok,share) = get_share(name)
    if not ok:
        return share
    files = []
    for file in sorted(os.listdir(share['path'])):
        files.append(file_stat(os.path.join(share['path'],file)))
    return render_template(
        "list.html",
        name = share['name'],
        entries = files,
        public = get_or_none(share,'public'),
        upload = get_or_none(share,'upload'),
        expire = get_or_none(share,'expire')
    )
    #~ return jsonify({"share":share, "files": files})

@app.route('/download/<name>/<filename>', methods=['GET'])
def download_file(name,filename):
    (ok,share) = get_share(name)
    if not ok:
        return share
    file_path = os.path.join(share['path'], filename)
    if not os.path.exists(file_path):
        return 'no such file'
    return send_from_directory(directory=share['path'], filename=filename)

def file_stat(filename):
    s = os.stat(filename)
    return {
        'size': file_size_human(s.st_size),
        'mtime': file_date_human(s.st_mtime),
        'name': os.path.basename(filename)
    }

def file_size_human(num):
    for x in ['&nbsp;B','KB','MB','GB','TB']:
        if num < 1024.0:
            if x=='&nbsp;B':
                return "%d&nbsp;%s" % (num, x)
            return "%3.1f&nbsp;%s" % (num, x)
        num /= 1024.0

def file_date_human(num):
    return datetime.fromtimestamp(
        num
    ).strftime(app.config['DATE_FORMAT'])




def get_or_none(d,key):
    if key in d:
        return d[key]
    else:
        return None

def get_share(name):
    share = [x for x in g.shares if x['name'] == name]
    if len(share) < 1:
        return (False,'No such share')
    share = share[0]
    if is_expired(share):
        return (False, 'Share has expired')
    authenticated = True
    if 'pass_hash' in share:
        authenticated = False
        printerr(session)
        if name in session:
            printerr(share['pass_hash'])
            if session[name] == share['pass_hash']:
                printerr(session[name])
                printerr(share['pass_hash'])
                authenticated = True
    if not authenticated:
        return (False,redirect(url_for('authenticate',name=name)))
    if not 'path' in share:
        return (False,'no path defined')
    share.update({
        "path": os.path.join(
            app.config['UPLOAD_FOLDER'],
            share['path']
        )
    })
    if not os.path.exists(share['path']):
        os.makedirs(share['path'])
        os.chown(share['path'], app.config['UID'], -1)
    return (True,share)

def is_expired(share):
    expires = get_or_none(share, 'expire')
    if expires:
        if datetime.now() > datetime.strptime(expires, app.config['DATE_FORMAT']):
            return True
    return False

def printerr(s):
    sys.stderr.write(str(s)+"\n")
    sys.stderr.flush()

if __name__ == "__main__":
    app.run(debug=True)