#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import flask
import flask_login as fll
import datetime
from db import db, File, User, levels_users
import settings
from werkzeug.utils import secure_filename
import os
import os.path
_here = os.path.dirname(os.path.realpath(__file__))

login_manager = fll.LoginManager()

app = flask.Flask(__name__)
app.config.from_pyfile('settings.cfg')

app.config['UPLOAD_FOLDER'] = settings.UPLOAD_FOLDER
app.config['MAX_CONTENT_LENGTH'] = settings.MAX_FILE_SIZE * 1024 * 1024

#######################################################################
#                          Plugin management                          #
#######################################################################

# Login manager
login_manager.init_app(app)

# Database management
db.app = app
db.init_app(app)
db.create_all()
db.session.commit()

# Insert admin if not exist
if User.query.limit(1).first() is None:
    admin = User(login='admin', name='Admin', is_admin=levels_users['Admin'])
    admin.set_password('admin')
    db.session.add(admin)
    db.session.commit()

# Login management
@login_manager.user_loader
def load_user(user_id):
    if user_id is None :
        return None
    return User.query.get(user_id)

@login_manager.unauthorized_handler
def unauthorized_callback():
    return flask.redirect('/login?next=' + flask.request.path)


#######################################################################
#                    Global variables or fuctions                     #
#######################################################################
URL_DEFAULT = '/myrepo'

@app.route('/')
def home():
    user = fll.current_user
    if not hasattr(user, 'is_admin'):
        user = None
    return flask.render_template("index.html", user=user)

@app.route('/favicon.ico')
def favicon():
    return flask.redirect('/static/favicon.ico')
#######################################################################
#                            Login, logout                            #
#######################################################################

@app.route('/login', methods=['GET', 'POST'])
def login():
    if fll.current_user.is_authenticated:
        return flask.redirect(URL_DEFAULT)
    if flask.request.method=="POST":
        username = flask.request.form['username']
        password = flask.request.form['password']
        user =  User.query.get(username)
        if user and user.is_admin > levels_users['Inactive'] and user.check_password(password):
            fll.login_user(user)
            next = flask.request.args.get('next')
            if next is not None and next[0]=='/':
                return flask.redirect(next)
            else:
                return flask.redirect(URL_DEFAULT)
        else:
            app.logger.warning('Login fail for user {} from {}'.format(user, flask.request.remote_addr))
            flask.flash('Nom d\'utilisateur ou mot de passe incorrect')
    return flask.render_template('login.html', user=None)

@app.route('/logout')
def logout():
    fll.logout_user()
    return flask.redirect('/')

#######################################################################
#                           Upload form                               #
#######################################################################

def check_filename_in_db(filename, user):
    exist = File.query.filter_by(name=filename, user=user.login).first()
    return exist is not None

def check_filename(filename, user):
    filepath = genpath(filename, user)
    if os.path.lexists(filepath) or check_filename_in_db(filename, user):
        fn, ext = os.path.splitext(filename)
        i = 0
        if settings.NMAX_EXTENSION == 0:
            return None
        filename = '{}_{:04d}{}'.format(fn, i, ext)
        while os.path.lexists(genpath(filename, user)) or check_filename_in_db(filename, user):
            i+=1
            filename = '{}_{:04d}{}'.format(fn, i, ext)
            if i > settings.NMAX_EXTENSION:
                break
        else:
            return filename
        return None 
    return filename

def genpath(filename, user):
    if isinstance(user, str):
        username = user
    else:
        username = user.login
    return os.path.join(app.config['UPLOAD_FOLDER'], username, filename)

@app.route('/up', methods=['GET', 'POST'])
def uploaderpage():
    user = fll.current_user
    if not hasattr(user, 'is_admin') or user.is_admin < levels_users['Simple user']:
        user = None

    if not flask.request.method=="POST":
        return flask.render_template('up.html', user=user)

    if flask.request.method=="POST" :
        # Parse global things
        if 'graphical' in flask.request.form and flask.request.form['graphical'] == '1':
            graphical = True
        else:
            graphical = False
        if 'visible' in flask.request.form and '1' in flask.request.form['visible']:
            visible = True
        else:
            visible = False
        if 'filepwd' in flask.request.form and len(flask.request.form['filepwd'])>0:
            filepwd = flask.request.form['filepwd']
        else:
            filepwd = None

        # Check auth first
        if user is None:
            print(flask.request.form)
            if 'username' not in flask.request.form or 'password' not in flask.request.form:
                return returnuploader(graphical, 'ERR: You have to provide creedentials or log in', None)
            username = flask.request.form['username']
            password = flask.request.form['password']
            user =  User.query.get(username)
            if not user or user.is_admin <= levels_users['Inactive'] or not user.check_password(password):
                return returnuploader(graphical, 'ERR: Incorrect login credentials', None)
            fll.login_user(user)

        # When auth ok, check for files !
        if 'file[]' not in flask.request.files:
            return returnuploader(graphical, 'ERR: File have to be provided (file[] field)', user)

        lfiles = flask.request.files.getlist('file[]')
        lnewnames = flask.request.form.getlist('filename[]')
        ldesc = flask.request.form.getlist('desc[]')

        done = 0
        ret="OK\n"
        for i in range(len(lfiles)):
            # if user does not select file, browser also
            # submit an empty part without filename
            f = lfiles[i]
            if f.filename == '':
                continue
            if i<len(lnewnames) and len(lnewnames[i])>0:
                name = lnewnames[i]
            else:
                name = f.filename
            if i<len(ldesc) and len(ldesc[i])>0:
                desc = ldesc[i]
            else:
                desc = ''
            name = secure_filename(name)
            name1 = check_filename(name, user)
            if name1 is None:
                return returnuploader(graphical, 'ERR: Already existing name {}'.format(name), user)

            # Add to database
            toadd = File(name=name1, user=user.login, visible=visible, date=datetime.datetime.now(), desc=desc)
            toadd.set_password(filepwd)
            db.session.add(toadd)
            db.session.commit()
            
            # Save it to disk
            path = genpath(name1, user)
            try:
                if not os.path.isdir(os.path.dirname(path)):
                    os.mkdir(os.path.dirname(path))
                f.save(path)
                ret += "/d/{}/{}\n".format(user.login, name1)
            except IOError as err:
                return returnuploader(graphical, 'ERR: Something went wrong when trying to write file to disk', user)
            
            done += 1

        # return
        if done == 0:
            return returnuploader(graphical, 'ERR: You have to provide at least one valid file', user)

        if graphical:
            return flask.redirect(URL_DEFAULT)
        else:
            return ret

def returnuploader(graphical, info, user):
    """
    Function to create return value for uploaderpage function
    If graphical is True, return the web page, otherwise return simple text

    graphical:bool: it is graphical session ?
    info:str: text to send
    user:User instance or None if not logged in
    """
    if not graphical:
        return info
    else:
        flask.flash(info)
        return flask.render_template('up.html', user=user)

#######################################################################
#                           Download pages                            #
#######################################################################
@app.route('/d/<user>/<filename>', defaults={'raw': False}, methods=['GET', 'POST'])
@app.route('/d/<user>/<filename>/raw', defaults = {'raw': True}, methods=['GET', 'POST'])
def dl(user, filename, raw=False):
    cuser = fll.current_user
    if not hasattr(cuser, 'is_admin') or cuser.is_admin < levels_users['Simple user']:
        cuser = None
    fl = File.query.filter_by(name=filename, user=user).first()
    if fl is None:
        return flask.abort(404)
    pwd = None
    if flask.request.method=="POST":
        if 'password' in flask.request.form:
            pwd = flask.request.form['password']
    if fl.check_password(pwd):
        path = genpath(filename, user)
        folder = os.path.dirname(path)
        fn = os.path.basename(path)
        if raw:
            return flask.send_from_directory(folder, filename=fn, as_attachment=False)
        else:
            return flask.send_from_directory(folder, filename=fn, as_attachment=False)
    else:
        if raw:
            return 'ERR: Incorrect password'
        else:
            if flask.request.method == "POST":
                flask.flash('Incorrect password')
            return flask.render_template('dl_pwd.html', user=cuser, filename=filename)
    pass

#######################################################################
#                             Show repos                              #
#######################################################################
@app.route('/myrepo')
@fll.login_required
def myrepo():
    return flask.redirect('/d/{}'.format(fll.current_user.login))

@app.route('/d/<user>')
def repo(user):
    user = User.query.get(user)
    if user is None:
        return flask.abort(404)
    cuser = fll.current_user
    if not hasattr(cuser, 'is_admin') or cuser.is_admin < levels_users['Simple user']:
        cuser = None
    
    ismine = user.login == cuser.login if cuser is not None else False
    isadmin = cuser.is_admin>=levels_users['Admin'] or ismine if cuser is not None else False

    if isadmin:
        l = File.query.filter_by(user=user.login).all()
    else:
        l = File.query.filter_by(user=user.login, visible=True).all()

    return flask.render_template('repo.html', user=cuser, isadmin=isadmin, ismine=ismine, folder=user.login, l=l)

#######################################################################
#                             Edit files                              #
#######################################################################
@app.route('/f/<id>/edit', methods=['GET', 'POST'])
@fll.login_required
def editfile(id):
    user = fll.current_user
    f = File.query.get(id)
    if f is None:
        return flask.redirect(URL_DEFAULT)
    if f.user != user.login and user.is_admin<levels_users['Admin']:
        return flask.redirect(URL_DEFAULT)

    if flask.request.method == "POST":
        if 'desc' in flask.request.form:
            f.desc = flask.request.form['desc']
        f.visible = False
        if 'visible' in flask.request.form:
            if flask.request.form['visible']=='1':
                f.visible = True
        if 'password' in flask.request.form and len(flask.request.form['password'])>0:
            f.set_password(flask.request.form['password'])
        # TODO: Add name change but this have to be done with file also !  <04-11-20, Léo Viallon-Galinier> #
        db.session.commit()
        return flask.redirect('/d/{}'.format(f.user))
    else:
        return flask.render_template('file_edit.html', user=user, f=f)

@app.route('/f/<id>/del')
@fll.login_required
def delfile(id):
    user = fll.current_user
    f = File.query.get(id)
    if f is None:
        return flask.redirect(URL_DEFAULT)
    if f.user != user.login and user.is_admin<levels_users['Admin']:
        return flask.redirect(URL_DEFAULT)

    confirm = flask.request.args.get('confirm')
    if confirm is not None:
        fpath = genpath(f.name, f.user)
        if os.path.isfile(fpath):
            os.remove(fpath)
        db.session.delete(f)
        db.session.commit()
        return flask.redirect('/d/{}'.format(f.user))
    return flask.render_template('file_del.html', user=user, f=f)


#######################################################################
#                          Users management                           #
#######################################################################
@app.route('/admin/users')
@fll.login_required
def admin_users():
    if fll.current_user.is_admin < levels_users['Admin users']:
        return flask.redirect(URL_DEFAULT)
    users = User.query.all()
    return flask.render_template('admin_users.html', user=fll.current_user, users=users)

@app.route('/admin/users/<user>', methods=['GET', 'POST'])
@fll.login_required
def edituser(user):
    new = user=='new'
    user = User.query.get(user)
    if not new and user is None:
        return flask.redirect('/admin/users')
    if fll.current_user.is_admin >= levels_users['Admin users'] and \
            (new or fll.current_user.is_admin >= user.is_admin):
        if flask.request.method=="POST":
            username = flask.request.form['username']
            name = flask.request.form['name']
            password = flask.request.form['password']
            level = int(flask.request.form['level'])
            if level not in levels_users.values():
                flask.flash('Level unknown')
                return flask.render_template("admin_user_edit.html", user=fll.current_user, useredit=user, levels_users=levels_users)
            if fll.current_user.is_admin < levels_users['Admin']:
                if not level < fll.current_user.is_admin:
                    flask.flash('Invalid level')
                    return flask.render_template("admin_user_edit.html", user=fll.current_user, useredit=user, levels_users=levels_users)
            if len(password)<2 and new:
                flask.flash('Mot de passe trop court')
                return flask.render_template("admin_user_edit.html", user=fll.current_user, useredit=user, levels_users=levels_users)
            if new and User.query.get(username) is not None:
                flask.flash('Login déjà utilisé ! Choisissez un autre !')
                return flask.render_template("admin_user_edit.html", user=fll.current_user, useredit=user, levels_users=levels_users)
            if new:
                usertoadd = User(login=username, name=name, is_admin=level)
                usertoadd.set_password(password)
                db.session.add(usertoadd)
            else:
                user.name = name
                if len(password)>=2:
                    user.set_password(password)
                user.is_admin = level
            db.session.commit()
            return flask.redirect('/admin/users')
        else:
            return flask.render_template("admin_user_edit.html", user=fll.current_user, useredit=user, levels_users=levels_users)
    return flask.redirect(URL_DEFAULT)

@app.route('/admin/users/<user>/del')
@fll.login_required
def deluser(user):
    user = User.query.get(user)
    if user is None:
        return flask.redirect('/admin/users')
    if fll.current_user.is_admin >= levels_users['Admin'] or \
            fll.current_user.is_admin >= levels_users['Admin users'] and \
            fll.current_user.is_admin > user.is_admin:
        confirm = flask.request.args.get('confirm')
        if confirm is not None:
            delete_files(user=user)
            db.session.delete(user)
            db.session.commit()
            return flask.redirect('/admin/users')
    return flask.render_template("admin_user_del.html", user=fll.current_user, useredit=user)

@app.route('/password', methods=['GET', 'POST'])
@fll.login_required
def change_password():
    if flask.request.method=="POST":
        password = flask.request.form['password']
        if len(password) < 5:
            flask.flash('Mot de passe trop court !')
        else:
            fll.current_user.set_password(password)
            db.session.commit()
            return flask.redirect(URL_DEFAULT)
    return flask.render_template("password.html", user=fll.current_user)

#######################################################################
#                           Files managament                          #
#######################################################################

def delete_files(user=None):
    if isinstance(user, str):
        username = user
    else:
        username = user.login
    lf = File.query.filter_by(user=username).all()
    for f in lf:
        fpath = genpath(f.name, f.user)
        if os.path.isfile(fpath):
            os.remove(fpath)
        db.session.delete(f)
        db.session.commit()


if __name__ == '__main__':
    app.run(debug=True, host='127.0.0.1', port=8080 )