use actix_session::Session;
use actix_web::{Responder, web};
use serde::{Serialize, Deserialize};

use yopa::ID;
use yopa::model::{PropertyModel, RelationModel};

use crate::session_ext::SessionExt;
use crate::TERA;
use crate::tera_ext::TeraExt;
use crate::utils::{ParseOrBadReq, redirect};

#[derive(Serialize, Debug)]
pub(crate) struct RelationModelDisplay<'a> {
    pub(crate) model: &'a RelationModel,
    pub(crate) related_name: &'a str,
    pub(crate) properties: Vec<&'a PropertyModel>,
}

#[get("/model/relation/create/{object_id}")]
pub(crate) async fn create_form(
    object_id: web::Path<String>,
    store: crate::YopaStoreWrapper,
    session: Session,
) -> actix_web::Result<impl Responder> {
    let mut context = tera::Context::new();
    session.render_flash(&mut context);

    let rg = store.read().await;

    debug!("ID = {}", object_id);

    let object = rg.get_object_model(object_id.parse_or_bad_request()?)
        .ok_or_else(|| actix_web::error::ErrorNotFound("No such source object"))?;

    let mut models: Vec<_> = rg.get_object_models().collect();

    models.sort_by_key(|m| &m.name);

    context.insert("models", &models);
    context.insert("object", &object);

    TERA.build_response("relation_create", &context)
}

#[derive(Deserialize)]
pub(crate) struct RelationModelCreateForm {
    pub object: ID,
    pub name: String,
    pub reciprocal_name: String,
    #[serde(default)]
    pub optional: bool,
    #[serde(default)]
    pub multiple: bool,
    pub related: ID,
}

#[post("/model/relation/create")]
pub(crate) async fn create(
    form: web::Form<RelationModelCreateForm>,
    store: crate::YopaStoreWrapper,
    session: Session,
) -> actix_web::Result<impl Responder> {
    let mut wg = store.write().await;
    let form = form.into_inner();
    match wg.define_relation(RelationModel {
        id: Default::default(),
        object: form.object,
        name: form.name.clone(),
        reciprocal_name: form.reciprocal_name.clone(),
        optional: form.optional,
        multiple: form.multiple,
        related: form.related,
    }) {
        Ok(_id) => {
            debug!("Relation created, redirecting to root");
            session.flash_success(format!("Relation model \"{}\" created.", form.name));
            redirect("/")
        }
        Err(e) => {
            warn!("Error creating relation model: {:?}", e);
            session.flash_error(e.to_string());
            redirect(format!("/model/relation/create/{}", form.object))
        }
    }
}

#[derive(Serialize, Debug)]
pub(crate) struct ObjectOrRelationModelDisplay {
    pub(crate) id: ID,
    pub(crate) describe: String,
}

#[get("/model/relation/delete/{id}")]
pub(crate) async fn delete(
    id: web::Path<String>,
    store: crate::YopaStoreWrapper,
    session: Session,
) -> actix_web::Result<impl Responder> {
    let mut wg = store.write().await;
    match wg.undefine_relation(id.parse_or_bad_request()?) {
        Ok(rm) => {
            debug!("Relation deleted, redirecting to root");
            session.flash_success(format!("Relation model \"{}\" deleted.", rm.name));
            redirect("/")
        }
        Err(e) => {
            warn!("Error deleting relation model: {:?}", e);
            session.flash_error(e.to_string());
            redirect("/") // back?
        }
    }
}

#[derive(Serialize,Deserialize)]
pub(crate) struct RelationModelEditForm {
    pub name: String,
    pub reciprocal_name: String,
    #[serde(default)]
    pub optional: bool,
    #[serde(default)]
    pub multiple: bool,
}

#[get("/model/relation/update/{model_id}")]
pub(crate) async fn update_form(
    model_id: web::Path<ID>,
    store: crate::YopaStoreWrapper,
    session: Session,
) -> actix_web::Result<impl Responder> {
    let mut context = tera::Context::new();
    session.render_flash(&mut context);
    let rg = store.read().await;

    let model = rg.get_relation_model(*model_id)
        .ok_or_else(|| actix_web::error::ErrorNotFound("No such model"))?;

    // Re-fill old values
    if let Ok(Some(form)) = session.take::<RelationModelEditForm>("old") {
        let mut model = model.clone();
        model.name = form.name;
        model.optional = form.optional; // TODO try if regular bools cant be used
        model.multiple = form.multiple;
        context.insert("model", &model);
    } else {
        context.insert("model", model);
    }

    TERA.build_response("relation_update", &context)
}

#[post("/model/relation/update/{model_id}")]
pub(crate) async fn update(
    model_id: web::Path<ID>,
    form: web::Form<RelationModelEditForm>,
    store: crate::YopaStoreWrapper,
    session: Session,
) -> actix_web::Result<impl Responder> {
    let mut wg = store.write().await;
    let form = form.into_inner();

    let id = model_id.into_inner();
    match wg.update_relation(RelationModel {
        id,
        object: Default::default(), // dummy
        name: form.name.clone(),
        reciprocal_name: form.reciprocal_name.to_string(),
        optional: form.optional,
        multiple: form.multiple,
        related: Default::default() // dummy
    }) {
        Ok(_id) => {
            debug!("Relation updated, redirecting to root");
            session.flash_success(format!("Relation model \"{}\" updated.", form.name));
            redirect("/")
        }
        Err(e) => {
            warn!("Error updating model: {:?}", e);
            session.flash_error(e.to_string());
            session.set("old", form);
            redirect(format!("/model/relation/update/{}", id))
        }
    }
}