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
import types


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,
    RegularCostInstance,
    calculate_regular_cost_instances,
    get_users_active_vehicle,
)
from .. import app, db


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

    form = SelectVehicleForm()
    form.vehicle.choices = [
        (g.id, g.name) for g in active_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(data)
        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"))

    form = EditPitstopForm()
    data = get_event_line_for_vehicle(vehicle)
    data = [x for x in data if x != edit_pitstop]
    form.set_pitstops(data)
    if not form.is_submitted():
        form.odometer.default = edit_pitstop.odometer
        form.litres.default = edit_pitstop.amount
        form.date.default = edit_pitstop.date
        form.costs.default = edit_pitstop.costs
    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.preinit_with_data()
    form.process()
    return render_template(
        "editPitStopForm.html",
        form=form,
        vehicle=vehicle,
        messages=form.get_hint_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)
        for regular_instance in calculate_regular_cost_instances(vehicle):
            data.append(regular_instance)

        data.sort(key=pitstop_service_key)
        v = {
            "id": vehicle.id,
            "name": vehicle.name,
            "data": data,
            "regulars": vehicle.regulars,
        }
        user["vehicles"].append(v)
    user["vehicles"].sort(key=lambda v: (v["data"][-1].date, v["data"][-1].odometer or 0 ))

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