from datetime import date

from flask import Flask
from flask import redirect, g
from flask import render_template
from flask import url_for
from flask_mail import Mail
from flask_security import Security, SQLAlchemyUserDatastore, \
    login_required, roles_required, user_registered
from flask_security.core import current_user
from flask_security.forms import LoginForm
from flask_sqlalchemy import SQLAlchemy
import os
from config import config

from .forms import \
    CreatePitstopForm, \
    EditVehicleForm, \
    DeleteVehicleForm, \
    SelectVehicleForm, \
    DeleteAccountForm, \
    DeletePitStopForm, \
    EditPitstopForm
from .tools import *

app = Flask(__name__)
app.config.from_object(config[os.getenv('FLASK_CONFIG') or 'default'])

db = SQLAlchemy(app)
mail = Mail(app)

from .entities import \
    User, \
    Role, \
    Pitstop, \
    Vehicle
from .filters import *
#import rollerverbrauch.tools as tools
# required to activate the filters


user_datastore = SQLAlchemyUserDatastore(db, User, Role)
security = Security(app, user_datastore)


@user_registered.connect_via(app)
def user_registered_sighandler(app, user, confirm_token):
    """
    Called after a user was created
    """
    role = user_datastore.find_role('user')
    user_datastore.add_role_to_user(user, role)
    new_vehicle = Vehicle('default vehicle')
    db.session.add(new_vehicle)
    user.vehicles.append(new_vehicle)
    db.session.commit()
    tools.db_log_add(user)
    tools.db_log_add(new_vehicle)


@app.before_first_request
def before_first_request():
    db.create_all()
    user_datastore.find_or_create_role(name='admin', description='Role for administrators')
    user_datastore.find_or_create_role(name='user', description='Role for all users.')
    db.session.commit()


@app.before_request
def before_request():
    g.data = {}


@app.route('/')
def index():
    if current_user.is_authenticated:
        return redirect(url_for('get_pit_stops'))
    else:
        user_count = len(User.query.all())
        vehicles = Vehicle.query.all()
        litres = 0
        kilometers = 0
        for vehicle in vehicles:
            stats = tools.VehicleStats(vehicle)
            litres += stats.overall_litres
            kilometers += stats.overall_distance
        vehicle_count = len(vehicles)
        pitstop_count = len(Pitstop.query.all())
        data = {
            'users':user_count,
            'vehicles': vehicle_count,
            'pitstops': pitstop_count,
            'litres': litres,
            'kilometers': kilometers
        }
        return render_template('index.html', login_user_form=LoginForm(), data=data)


@app.route('/account/edit_vehicle/<int:vid>', methods=['GET', 'POST'])
@login_required
def edit_vehicle(vid):
    vehicle = Vehicle.query.filter(Vehicle.id == vid).first()
    form = EditVehicleForm()

    if form.validate_on_submit():
        if not tools.check_vehicle_name_is_unique(current_user, form.name):
            return render_template('editVehicleForm.html', form=form)
        vehicle.name = form.name.data
        db.session.commit()
        tools.db_log_update(vehicle)
        return redirect(url_for('get_account_page'))

    form.name.default = vehicle.name
    form.process()
    return render_template('editVehicleForm.html', form=form)


@app.route('/account/delete_vehicle/<int:vid>', methods=['GET', 'POST'])
@login_required
def delete_vehicle(vid):
    vehicle = Vehicle.query.filter(Vehicle.id == vid).first()

    # prevent deletion of foreign vehicles
    if vehicle not in current_user.vehicles:
        return redirect(url_for('get_account_page'))

    form = DeleteVehicleForm()

    if form.validate_on_submit():
        db.session.delete(vehicle)
        db.session.commit()
        tools.db_log_delete(vehicle)
        return redirect(url_for('get_account_page'))

    return render_template('deleteVehicleForm.html', form=form, vehicle=vehicle)


@app.route('/account/create_vehicle', methods=['GET', 'POST'])
@login_required
def create_vehicle():
    form = EditVehicleForm()

    if form.validate_on_submit():
        vehicle_name = form.name.data
        if not tools.check_vehicle_name_is_unique(current_user, form.name):
            return render_template('createVehicleForm.html', form=form)
        new_vehicle = Vehicle(vehicle_name)
        db.session.add(new_vehicle)
        current_user.vehicles.append(new_vehicle)
        db.session.commit()
        tools.db_log_add(new_vehicle)
        return redirect(url_for('get_account_page'))

    return render_template('createVehicleForm.html', form=form)


@app.route('/pitstops/select_vehicle', methods=['GET', 'POST'])
@login_required
def select_vehicle_for_new_pitstop():
    form = SelectVehicleForm()
    form.vehicle.choices = [(g.id, g.name) for g in current_user.vehicles]

    if form.validate_on_submit():
        vehicle = Vehicle.query.filter(Vehicle.id == form.vehicle.data).first()
        if vehicle not in current_user.vehicles:
            return render_template('selectVehice.html', form=form)

        return redirect(url_for('create_pit_stop_form', vid=form.vehicle.data))

    return render_template('selectVehice.html', form=form)


@app.route('/pitstops/create/<int:vid>', methods=['GET', 'POST'])
@login_required
def create_pit_stop_form(vid):
    vehicle = Vehicle.query.filter(Vehicle.id == vid).first()
    if vehicle not in current_user.vehicles:
        return redirect(url_for('select_vehicle_for_new_pitstop'))

    if len(vehicle.pitstops) > 0:
        last_pitstop = vehicle.pitstops[-1]
    else:
        last_pitstop = Pitstop(0, 0, date(1970, 1, 1), 0)

    form = CreatePitstopForm()
    form.set_pitstop(last_pitstop)

    if form.validate_on_submit():
        new_stop = Pitstop(form.odometer.data, form.litres.data, form.date.data, form.costs.data)
        db.session.add(new_stop)
        vehicle.pitstops.append(new_stop)
        db.session.commit()
        tools.db_log_add(new_stop)
        return redirect(url_for('get_pit_stops', _anchor= 'v' + str(vehicle.id)))

    form.odometer.default = last_pitstop.odometer
    form.litres.default = last_pitstop.litres
    form.date.default = date.today()
    form.costs.default = last_pitstop.costs
    form.process()
    messages = {
        'date': 'Date must be between %s and %s (including).' % (str(last_pitstop.date), str(date.today())),
        'odometer': 'Odometer must be greater than %s km.' % (str(last_pitstop.odometer)),
        'costs': 'Costs must be higher than 0.01 €.'
    }
    return render_template('newPitStopForm.html', form=form, vehicle=vehicle, messages = messages)


@app.route('/pitstops/delete/<int:pid>', methods=['GET', 'POST'])
@login_required
def delete_pit_stop_form(pid):
    pitstop = Pitstop.query.filter(Pitstop.id == pid).first()
    if pitstop is None:
        return redirect(url_for('get_pit_stops'))
    vehicle = Vehicle.query.filter(Vehicle.id == pitstop.vehicle_id).first()
    if vehicle not in current_user.vehicles:
        return redirect(url_for('get_pit_stops'))

    form = DeletePitStopForm()
    if form.validate_on_submit():
        db.session.delete(pitstop)
        db.session.commit()
        tools.db_log_delete(pitstop)
        return redirect(url_for('get_pit_stops', _anchor='v' + str(vehicle.id)))

    return render_template('deletePitstopForm.html', form=form, pitstop=pitstop )


@app.route('/pitstops/edit/<int:pid>', methods=['GET', 'POST'])
@login_required
def edit_pit_stop_form(pid):
    edit_pitstop = Pitstop.query.filter(Pitstop.id == pid).first()
    if edit_pitstop is None:
        return redirect(url_for('get_pit_stops'))
    vehicle = Vehicle.query.filter(Vehicle.id == edit_pitstop.vehicle_id).first()
    if vehicle not in current_user.vehicles:
        return redirect(url_for('get_pit_stops'))

    last_pitstop_pos = vehicle.pitstops.index(edit_pitstop) - 1
    if last_pitstop_pos > 0:
        last_pitstop = vehicle.pitstops[last_pitstop_pos]
    else:
        last_pitstop = Pitstop(0, 0, date(1970, 1, 1))

    form = EditPitstopForm()
    form.set_pitstop(last_pitstop)

    if form.validate_on_submit():
        edit_pitstop.costs = form.costs.data
        edit_pitstop.date = form.date.data
        edit_pitstop.litres = form.litres.data
        edit_pitstop.odometer = form.odometer.data
        db.session.commit()
        tools.db_log_update(edit_pitstop)
        return redirect(url_for('get_pit_stops', _anchor='v' + str(vehicle.id)))

    form.odometer.default = edit_pitstop.odometer
    form.litres.default = edit_pitstop.litres
    form.date.default = edit_pitstop.date
    form.costs.default = edit_pitstop.costs
    form.process()
    messages = {
        'date': 'Date must be between %s and %s (including).' % (str(last_pitstop.date), str(date.today())),
        'odometer': 'Odometer must be greater than %s km.' % (str(last_pitstop.odometer))
    }
    if edit_pitstop.costs > 0:
        messages['costs'] = 'Costs must be higher than 0.01 €.'
    return render_template('editPitStopForm.html', form=form, vehicle=vehicle, messages=messages)


@app.route('/pitstops', methods=['GET'])
@login_required
def get_pit_stops():
    return render_template('pitstops.html', user=current_user)


@app.route('/manual', methods=['GET'])
@login_required
def get_manual():
    return render_template('manual.html', data=g.data)


@app.route('/admin', methods=['GET'])
@roles_required('admin')
def get_admin_page():
    g.data['users'] = User.query.all()
    return render_template('admin.html', data=g.data)


@app.route('/account', methods=['GET'])
@login_required
def get_account_page():
    return render_template('account.html', data=g.data)


@app.route('/statistics', methods=['GET'])
@login_required
def get_statistics():
    stats = []
    for vehicle in current_user.vehicles:
        stats.append(tools.VehicleStats(vehicle))
    return render_template('statistics.html', data=stats)


@app.route('/account/delete', methods=['GET', 'POST'])
@login_required
def delete_account():
    form = DeleteAccountForm()

    if form.validate_on_submit():
        user_datastore.delete_user(current_user)
        db.session.commit()
        return redirect(url_for('index'))

    return render_template('deleteAccountForm.html', form=form)