#!/bin/python3

import os
import shutil
import tempfile
from zipfile import ZipFile

from flask import Flask, flash, request, redirect, send_file, render_template, g
from werkzeug.utils import secure_filename
import docx

import config
import tosca2doc
import doc2tosca

class ReverseProxied(object):

    def __init__(self, app, script_name=None, scheme=None, server=None):
        self.app = app
        self.script_name = script_name
        self.scheme = scheme
        self.server = server
        print("Reverse Proxy set up")

    def __call__(self, environ, start_response):
        print("ReverseProxy called")
        script_name = environ.get('HTTP_X_SCRIPT_NAME', '') or self.script_name
        if script_name:
            environ['SCRIPT_NAME'] = script_name
            path_info = environ['PATH_INFO']
            if path_info.startswith(script_name):
                environ['PATH_INFO'] = path_info[len(script_name):]
        scheme = environ.get('HTTP_X_SCHEME', '') or self.scheme
        if scheme:
            environ['wsgi.url_scheme'] = scheme
        server = environ.get('HTTP_X_FORWARDED_HOST', '') or self.server
        print('HTTP_X_FORWARDED_SERVER ' + environ.get('HTTP_X_FORWARDED_SERVER'))
        print('HTTP_X_FORWARDED_FOR ' + environ.get('HTTP_X_FORWARDED_FOR'))
        print('HTTP_X_FORWARDED_HOST ' + environ.get('HTTP_X_FORWARDED_HOST'))
        if server:
            environ['HTTP_HOST'] = server
        return self.app(environ, start_response)


app = Flask(__name__)
app.wsgi_app = ReverseProxied(app.wsgi_app, script_name='/tosca-ie')

UPLOAD_FOLDER = '/tmp/upload'

ALLOWED_EXTENSIONS = set(['txt', 'yaml', 'docx'])

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.secret_key = 'super secret key'
app.config['SESSION_TYPE'] = 'filesystem'

TOSCA_DEFS = ['VNFD', 'NSD', 'PNFD']

def allowed_file(filename):
    '''
    Check filename is in the list of allowed extensions
    '''
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS


@app.route("/")
def hello():
    '''
    Render home page
    '''
    return render_template("./home.html", VERSION=config.VERSION)

@app.route("/doc2tosca-info")
def doc2tosca_info():
    '''
    Render home page
    '''
    return render_template("./doc2tosca-details.html", VERSION=config.VERSION)

@app.route("/tosca2doc-info")
def tosca2doc_info():
    '''
    Render home page
    '''
    return render_template("./tosca2doc-details.html", VERSION=config.VERSION)

@app.route("/tosca2doc", methods=['POST'])
def mk_tosca2doc():

    if 'file' not in request.files:
        flash('Error: No file uploaded.')
        return redirect("/tosca-ie")

    ufiles=request.files.getlist("file")

    for tosca_def in TOSCA_DEFS:
        found=False
        for uploaded_file in ufiles:
            if tosca_def in uploaded_file.filename or \
                tosca_def.lower() in uploaded_file.filename:
                found=True
                #if uploaded_file:
                #    print "-------------------"
                #    print uploaded_file.read()
                #    print "-------------------"
        if not found:
            flash('Error: some TOSCA module missing. Make sure to upload definitions for NSD, VNFD, PNFD.')
            print('Error: TOSCA module missing.')
            return redirect("/tosca-ie")

    for file in ufiles:
        if file.filename == '':
            print('Error: No selected file')
            flash('Error: No file uploaded or wrong name.')
            return redirect("/tosca-ie")

    tmp_dir = tempfile.mkdtemp()
    g.tmp_dir = tmp_dir

    doc = docx.Document()    

    for tosca_def in TOSCA_DEFS:
        for file in ufiles:
            if tosca_def in uploaded_file.filename or \
                tosca_def.lower() in uploaded_file.filename:
                filename = secure_filename(file.filename)
                filepath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
                file.save(filepath)
                file.close()

                tosca2doc.generate_from_file(tosca_def, doc, filepath)

    outfilename = os.path.join(tmp_dir, 'myfile.docx')

    doc.save(outfilename)
    return send_file(outfilename)

    #return ("No content found")

def get_all_yaml_file_paths(directory): 

    # initializing empty file paths list
    file_paths = []

    # crawling through directory and subdirectories
    for root, directories, files in os.walk(directory):
        for filename in files:
            if ".yaml" in filename:
                # join the two strings in order to form the full filepath.
                filepath = os.path.join(root, filename)
                file_paths.append(filepath)
                print(filepath)

    # returning all file paths
    return file_paths

@app.after_request
def after_request(response):
    if request.path != '/doc2tosca':
        return response
    shutil.rmtree(g.tmp_dir, ignore_errors=True)
    print("Deleted {}\n\n".format(g.tmp_dir))
    return response

@app.route("/doc2tosca", methods=['POST'])
def mk_doc2tosca():

    zip_fn = "tosca_defs.zip"

    if 'file' not in request.files:
        flash('No file part')
        return redirect(request.url)

    ufiles = request.files.getlist("file")

    sol001_file = ufiles[0]

    doc2tosca.generate_templates(sol001_file)

    tmp_dir = tempfile.mkdtemp()
    print("TMP DIR: " + tmp_dir)
    doc2tosca.print_to_files(tmp_dir)

    file_paths = get_all_yaml_file_paths(tmp_dir)

    zip_path = os.path.join(tmp_dir, zip_fn)

    with ZipFile( zip_path, 'w') as archive:
        for myfile in file_paths:
            archive.write(myfile, arcname=os.path.basename(myfile))

    g.tmp_dir = tmp_dir
    return send_file(zip_path, as_attachment=True)

if __name__ == '__main__':
    app.run(debug=True,host='0.0.0.0')