#!/usr/bin/env python

from flask import Flask, g, redirect, url_for, render_template, abort, request, session
from flaskext.auth import Auth, AuthUser, login_required, logout
from collections import OrderedDict
import argparse, socket, re
import hashlib, configobj, json, sys, os
import modules.api as api
import modules.security as security

# Modify config file name:
configfile = "example.conf"

app = Flask(__name__)

@app.before_request
def init():
    if session:
        security.csrfProtect()
    config = api.getConfig()
    g.users = {}
    for k, v in config["general_settings"]["users"].iteritems():
        addUser = AuthUser(username=k)
        addUser.set_and_encrypt_password(v)
        g.users[k] = addUser

@login_required()
def generatePage():
    requestedRoute = str(request.url_rule)[1:]
    if configValueExists(requestedRoute):
        blockValues = {}
        blockArray = []
        configValues = {}
        configValues["navbar"] = config["navbar"]["menu"]
        configValues["server_location"] = config["general_settings"]["server"].get("url")
        configValues["flask_server_location"] = config["general_settings"]["server"].get("flask_url")
        configValues["domoboard"] = config["general_settings"]["domoboard"]
        configValues["display_components"] = strToList(config[requestedRoute]["display_components"].get("components"))
        configValues["config"] = config
        for component in configValues["display_components"]:
                match = re.search("^(.+)\[(.+)\]$", component)
                if not match:
                    blockValues[component] = retrieveValue(requestedRoute, component)
                else:
                    blockValues[match.group(1)] = retrieveValue(requestedRoute, component)
                blockArray.append(blockValues)
                blockValues = {}
        return render_template('index.html',
                                configValues = configValues,
                                blockArray = blockArray,
                                _csrf_token = session['_csrf_token'])
    else:
        abort(404)

@app.route('/')
def index():
    return redirect('dashboard')

@login_required()
def retrieveValue(page, component):
    dict = {}
    try:
        match = re.search("^(.+)\[(.+)\]$", component)
        if not match:
            for k, v in config[page][component].iteritems():
                v = strToList(v)
                dict[k] = v
        else:
            for sk, sv in config[page][match.group(1)][match.group(2)].iteritems():
                sv = strToList(sv)
                sv.append(match.group(2))
                dict[sk] = sv
    except:
        dict = {}
    return dict

def logout_view():
    user_data = logout()
    session.clear()
    if user_data is None:
        return render_template('logout.html', loggedout = "nobody")
    return render_template('logout.html', loggedout = '{0}'.format(user_data['username']))

@app.route('/login/', methods=['POST', 'GET'])
def login_form():
    if request.method == 'POST':
        username = request.form['username']
        if username in g.users:
            if g.users[username].authenticate(request.form['password']):
                security.generateCsrfToken()
                return redirect(url_for('dashboard'))
            return render_template('login.html')
    return render_template('login.html')

@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'), 404

def strToList(str):
    if not isinstance(str, list):
        return [str]
    else:
        return str

def configValueExists(value):
    try:
        config[value]
        exists = True
    except:
        exists = False
    return exists

def validateConfigFormat(config):
    requiredSettings = {"general_settings/server": ["url", "flask_url", "user", "password", "secret_key"],
                        "general_settings/domoboard": ["time"],
                        "navbar/menu": [None] }
    for sect, fields in requiredSettings.iteritems():
        section = sect.split('/')
        for field in fields:
            try:
                value = config[section[0]][section[1]][field]
            except:
                if field is None:
                        if section[1] not in config[section[0]]:
                            sys.exit("Config section not set: [{}] with subsection [[{}]]".format(section[0], section[1]))
                else:
                    sys.exit("Config field {} not set: section [{}] with subsection [[{}]]".format(field, section[0], section[1]))

def appendDefaultPages(config):
    config['settings'] = {'display_components': {'components': 'settings'}}
    config['log'] =  {'display_components': {'components': 'serverlog'}}
    return config

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument("-c", "--config", dest="configfile",
                  help="Specify a config file", metavar="<CONFIG>")
    parser.add_argument("-d", "--debug", dest="debug", action="store_true",
                  help="Run in debug mode")
    args = parser.parse_args()
    if args.configfile:
       configfile = args.configfile
    if os.path.isfile(configfile):
        unsanitizedConfig = configobj.ConfigObj(configfile)
    else:
        sys.exit("Config file {} does not exist.".format(configfile))

    config = json.loads(security.sanitizeString(json.dumps(unsanitizedConfig)), object_pairs_hook=OrderedDict)
    watchfiles = [configfile]
    config = appendDefaultPages(config)
    api.setConfig(config, unsanitizedConfig)
    api.init()
    validateConfigFormat(config)
    api.checkDomoticzStatus(config)
    server_location = config["general_settings"]["server"]["url"]
    flask_server_location = config["general_settings"]["server"]["flask_url"]
    auth = Auth(app, login_url_name='login_form')
    auth.user_timeout = 0

    app.secret_key = config["general_settings"]["server"]["secret_key"]
    app.add_url_rule('/', 'index', index)
    for k, v in config["navbar"]["menu"].iteritems():
        app.add_url_rule('/' + v.lower(), v.lower(), generatePage, methods=['GET'])
    app.add_url_rule('/settings', 'settings', generatePage, methods=['GET'])
    app.add_url_rule('/log', 'log', generatePage, methods=['GET'])
    app.add_url_rule('/logout/', 'logout', logout_view, methods=['GET'])
    app.add_url_rule('/api', 'api', api.gateway, methods=['POST'])
    try:
        app.run(host=flask_server_location.split(":")[0],port=int(flask_server_location.split(":")[1]),threaded=True, extra_files=watchfiles, debug=args.debug)
    except socket.error, exc:
        sys.exit("Error when starting the Flask server: %s" % exc)