from flask import url_for, redirect, render_template, flash
from flask_security import login_required
from flask_security.core import current_user
from sqlalchemy.exc import IntegrityError
from datetime import date

from ..entities import Vehicle, Consumable, Pitstop
from ..forms import SelectVehicleForm, SelectConsumableForm, CreatePitstopForm, EditPitstopForm, DeletePitStopForm
from ..tools import db_log_update, db_log_delete, db_log_add, pitstop_service_key, \
    get_event_line_for_vehicle, update_filling_station_prices
from .. import app, db


@app.route('/pitstops/vehicle/select', methods=['GET', 'POST'])
@login_required
def select_vehicle_for_new_pitstop():
    if len(current_user.vehicles) == 1:
        return redirect(url_for('select_consumable_for_new_pitstop', vid=current_user.vehicles[0].id))

    form = SelectVehicleForm()
    form.vehicle.choices = [(g.id, g.name) for g in current_user.vehicles]

    if form.validate_on_submit():
        return redirect(url_for('select_consumable_for_new_pitstop', vid=form.vehicle.data))

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


@app.route('/pitstops/vehicle/<int:vid>/consumable/select', methods=['GET', 'POST'])
@login_required
def select_consumable_for_new_pitstop(vid):
    vehicle = Vehicle.query.get(vid)
    if vehicle is None or vehicle not in current_user.vehicles:
        return redirect(url_for('select_vehicle_for_new_pitstop'))

    if len(vehicle.consumables) == 0:
        flash('Please choose at least one consumable!', 'warning')
        return redirect(url_for('edit_vehicle', vid=vid))

    if len(vehicle.consumables) == 1:
        return redirect(url_for('create_pit_stop_form', vid=vid, cid=vehicle.consumables[0].id))

    form = SelectConsumableForm()
    form.consumable.choices = [(g.id, g.name) for g in vehicle.consumables]

    if form.validate_on_submit():
        return redirect(url_for('create_pit_stop_form', vid=vid, cid=form.consumable.data))

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


@app.route('/pitstops/vehicle/<int:vid>/consumable/<int:cid>/create', methods=['GET', 'POST'])
@login_required
def create_pit_stop_form(vid, cid):
    vehicle = Vehicle.query.get(vid)
    if vehicle is None or vehicle not in current_user.vehicles:
        return redirect(url_for('select_vehicle_for_new_pitstop'))

    consumable = Consumable.query.get(cid)
    if consumable not in vehicle.consumables:
        return redirect(url_for('select_consumable_for_new_pitstop', vid=vid))

    form = CreatePitstopForm()

    data = get_event_line_for_vehicle(vehicle)
    if len(data) > 0:
        form.set_pitstops(vehicle.pitstops)
        form.same_odometer_allowed = (type(data[-1]) != Pitstop) or (data[-1].consumable.id != cid)
    else:
        form.set_pitstops([])
        form.same_odometer_allowed = True

    # set the label of the litres field to make the user comfortable
    form.set_consumable(consumable)

    # preinitialize the defaults with potentially existing values from a try before
    form.preinit_with_data()

    #
    #   Validate should accept same odometer on different consumables
    #
    if form.validate_on_submit():
        new_stop = Pitstop(form.odometer.data, form.litres.data, form.date.data, form.costs.data, cid)
        db.session.add(new_stop)
        vehicle.pitstops.append(new_stop)
        try:
            db.session.commit()
            db_log_add(new_stop)
        except IntegrityError:
            db.session.rollback()
            form.odometer.errors.append('Pitstop already present for %s at odometer %s km!' % (consumable.name, form.odometer.data))
            return render_template('createPitStopForm.html', form=form, vehicle=vehicle, messages=form.get_hint_messages())
        return redirect(url_for('get_pit_stops', _anchor= 'v' + str(vehicle.id)))

    form.process()
    return render_template('createPitStopForm.html', form=form, vehicle=vehicle, messages=form.get_hint_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()
        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.get(pid)
    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), 0, 0)

    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.amount = form.litres.data
        edit_pitstop.odometer = form.odometer.data
        db.session.commit()
        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.amount
    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 is not None and 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():
    user = {
        'vehicles': []
    }
    for vehicle in current_user.vehicles:
        data = []
        for pitstop in vehicle.pitstops:
            data.append(pitstop)
        for service in vehicle.services:
            data.append(service)
        data.sort(key=pitstop_service_key)
        v = {
            'id': vehicle.id,
            'name': vehicle.name,
            'data': data
        }
        user['vehicles'].append(v)

    return render_template('pitstops.html', user=user)


@app.route('/pitstops/plan/vehicle/select', methods=['GET', 'POST'])
@login_required
def select_vehicle_for_plan_pitstop():
    if len(current_user.vehicles) == 1:
        return redirect(url_for('select_consumable_for_plan_pitstop', vid=current_user.vehicles[0].id))

    form = SelectVehicleForm()
    form.vehicle.choices = [(g.id, g.name) for g in current_user.vehicles]

    if form.validate_on_submit():
        return redirect(url_for('select_consumable_for_plan_pitstop', vid=form.vehicle.data))

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


@app.route('/pitstops/plan/vehicle/<int:vid>/consumable/select', methods=['GET', 'POST'])
@login_required
def select_consumable_for_plan_pitstop(vid):
    vehicle = Vehicle.query.get(vid)
    if vehicle is None or vehicle not in current_user.vehicles:
        return redirect(url_for('select_consumable_for_plan_pitstop'))

    if len(vehicle.consumables) == 0:
        flash('Please choose at least one consumable!', 'warning')
        return redirect(url_for('edit_vehicle', vid=vid))

    if len(vehicle.consumables) == 1:
        return redirect(url_for('plan_pit_stop_form', vid=vid, cid=vehicle.consumables[0].id))

    form = SelectConsumableForm()
    form.consumable.choices = [(g.id, g.name) for g in vehicle.consumables]

    if form.validate_on_submit():
        return redirect(url_for('plan_pit_stop_form', vid=vid, cid=form.consumable.data))

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


@app.route('/pitstops/plan/vehicle/<int:vid>/consumable/<int:cid>', methods=['GET', 'POST'])
@login_required
def plan_pit_stop_form(vid, cid):
    vehicle = Vehicle.query.get(vid)
    if vehicle is None or vehicle not in current_user.vehicles:
        return redirect(url_for('select_vehicle_for_new_pitstop'))

    consumable = Consumable.query.get(cid)
    if consumable not in vehicle.consumables:
        return redirect(url_for('select_consumable_for_new_pitstop', vid=vid))

    update_filling_station_prices([x.id for x in current_user.favourite_filling_stations])

    offers = []
    for fs in current_user.favourite_filling_stations:
        offers.append((fs, getattr(fs, consumable.ext_id),))

    return render_template('planPitStopForm.html', vehicle=vehicle, consumable=consumable, offers=offers)