from flask import abort, redirect, render_template, session

from app import current_service, current_user, service_api_client, url_for
from app.main import main
from app.main.views.send import (
    all_placeholders_in_session,
    fields_to_fill_in,
    get_normalised_placeholders_from_session,
    get_placeholder_form_instance,
    get_recipient_and_placeholders_from_session,
)
from app.utils.templates import get_template
from app.utils.user import user_has_permissions


@main.route("/services/<uuid:service_id>/tour/<uuid:template_id>")
@user_has_permissions("send_messages")
def begin_tour(service_id, template_id):
    db_template = current_service.get_template_with_user_permission_or_403(
        template_id, current_user
    )

    if db_template["template_type"] != "sms" or not current_user.mobile_number:
        abort(404)

    template = get_template(
        db_template,
        current_service,
        show_recipient=True,
    )

    template.values = {"phone_number": current_user.mobile_number}

    session["placeholders"] = {}

    return render_template(
        "views/templates/start-tour.html",
        template=template,
        help="1",
        continue_link=url_for(
            ".tour_step", service_id=service_id, template_id=template_id, step_index=1
        ),
    )


@main.route(
    "/services/<uuid:service_id>/tour/<uuid:template_id>/step-<int:step_index>",
    methods=["GET", "POST"],
)
@user_has_permissions("send_messages", restrict_admin_usage=True)
def tour_step(service_id, template_id, step_index):
    db_template = current_service.get_template_with_user_permission_or_403(
        template_id, current_user
    )

    if db_template["template_type"] != "sms" or step_index == 0:
        abort(404)

    if "placeholders" not in session:
        return redirect(
            url_for(
                ".begin_tour", service_id=current_service.id, template_id=template_id
            )
        )

    template = get_template(
        db_template,
        current_service,
        show_recipient=True,
    )

    placeholders = fields_to_fill_in(template, prefill_current_user=True)
    try:
        # user urls are 1 indexed, so start at step-1
        current_placeholder = placeholders[step_index - 1]
    except IndexError:
        if all_placeholders_in_session(placeholders):
            return redirect(
                url_for(
                    ".check_tour_notification",
                    service_id=current_service.id,
                    template_id=template_id,
                )
            )
        return redirect(
            url_for(
                ".tour_step",
                service_id=current_service.id,
                template_id=template_id,
                step_index=1,
            )
        )

    form = get_placeholder_form_instance(
        current_placeholder,
        dict_to_populate_from=get_normalised_placeholders_from_session(),
        template_type=template.template_type,
        allow_international_phone_numbers=current_service.has_permission(
            "international_sms"
        ),
    )

    if form.validate_on_submit():
        session["placeholders"][current_placeholder] = form.placeholder_value.data

        if all_placeholders_in_session(placeholders):
            return redirect(
                url_for(
                    ".check_tour_notification",
                    service_id=current_service.id,
                    template_id=template_id,
                )
            )
        return redirect(
            url_for(
                ".tour_step",
                service_id=current_service.id,
                template_id=template_id,
                step_index=step_index + 1,
            )
        )

    back_link = _get_tour_step_back_link(service_id, template_id, step_index)

    template.values = get_recipient_and_placeholders_from_session(
        db_template["template_type"]
    )
    template.values[current_placeholder] = None

    return render_template(
        "views/send-test.html",
        page_title="Example text message",
        template=template,
        form=form,
        back_link=back_link,
        help="2",
    )


def _get_tour_step_back_link(service_id, template_id, step_index):
    if step_index == 1:
        return {
            "href": {
                "url": url_for(
                    "main.begin_tour", service_id=service_id, template_id=template_id
                ),
                "text": "Back to tour start",
            },
            "html": "Back to tour start",
        }
    else:
        return {
            "href": {
                "url": url_for(
                    "main.tour_step",
                    service_id=service_id,
                    template_id=template_id,
                    step_index=step_index - 1,
                ),
                "text": "Back to previous step",
            },
            "html": "Back to previous step",
        }


@main.route(
    "/services/<uuid:service_id>/tour/<uuid:template_id>/check", methods=["GET"]
)
@user_has_permissions("send_messages", restrict_admin_usage=True)
def check_tour_notification(service_id, template_id):
    db_template = current_service.get_template_with_user_permission_or_403(
        template_id, current_user
    )

    template = get_template(
        db_template,
        current_service,
        show_recipient=True,
    )

    if "placeholders" not in session:
        return redirect(
            url_for(
                ".begin_tour", service_id=current_service.id, template_id=template_id
            )
        )

    placeholders = fields_to_fill_in(template, prefill_current_user=True)

    if not all_placeholders_in_session(template.placeholders):
        return redirect(
            url_for(
                ".tour_step",
                service_id=current_service.id,
                template_id=template_id,
                step_index=1,
            )
        )

    back_link = {
        "href": {
            "url": url_for(
                "main.tour_step",
                service_id=current_service.id,
                template_id=template_id,
                step_index=len(placeholders),
            ),
            "text": "Back to previous step",
        },
        "html": "Back to previous step",
    }

    template.values = get_recipient_and_placeholders_from_session(
        template.template_type
    )

    return render_template(
        "views/notifications/preview.html",
        template=template,
        back_link=back_link,
        help="3",
    )


@main.route("/services/<uuid:service_id>/end-tour/<uuid:example_template_id>")
@user_has_permissions("manage_templates")
def go_to_dashboard_after_tour(service_id, example_template_id):
    service_api_client.delete_service_template(service_id, example_template_id)

    return redirect(url_for("main.service_dashboard", service_id=service_id))