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

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

use crate::routes::models::relation::RelationModelDisplay;
use crate::session_ext::SessionExt;
use crate::tera_ext::TeraExt;
use crate::utils::{redirect, StorageErrorIntoResponseError};
use crate::TERA;

#[derive(Serialize, Debug)]
pub(crate) struct ObjectModelDisplay<'a> {
    pub(crate) id: yopa::ID,
    pub(crate) name: &'a str,
    pub(crate) properties: Vec<&'a PropertyModel>,
    pub(crate) relations: Vec<RelationModelDisplay<'a>>,
    pub(crate) reciprocal_relations: Vec<RelationModelDisplay<'a>>,
}

#[get("/model/object/create")]
pub(crate) async fn create_form(session: Session) -> actix_web::Result<impl Responder> {
    let mut context = tera::Context::new();
    session.render_flash(&mut context);

    // Re-fill old values
    if let Ok(Some(form)) = session.take::<ObjectModelForm>("old") {
        context.insert("old", &form);
    } else {
        context.insert("old", &ObjectModelForm::default());
    }

    TERA.build_response("models/model_create", &context)
}

#[derive(Default, Debug, Clone, Serialize, Deserialize)]
pub(crate) struct ObjectModelForm {
    pub name: String,
}

#[post("/model/object/create")]
pub(crate) async fn create(
    form: web::Form<ObjectModelForm>,
    store: crate::YopaStoreWrapper,
    session: Session,
) -> actix_web::Result<HttpResponse> {
    let mut wg = store.write().await;
    let form = form.into_inner();
    match wg.define_object(ObjectModel {
        id: Default::default(),
        name: form.name.clone(),
    }) {
        Ok(_id) => {
            wg.persist().err_to_500()?;
            debug!("Object created, redirecting to root");
            session.flash_success(format!("Object model \"{}\" created.", form.name));
            redirect("/models")
        }
        Err(e) => {
            warn!("Error creating model: {}", e);
            session.flash_error(e.to_string());
            session.set("old", form).unwrap();
            redirect("/model/object/create")
        }
    }
}

#[get("/model/object/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_object_model(*model_id)
        .ok_or_else(|| actix_web::error::ErrorNotFound("No such model"))?;

    // Re-fill old values
    if let Ok(Some(form)) = session.take::<ObjectModelForm>("old") {
        let mut model = model.clone();
        model.name = form.name;
        context.insert("model", &model);
    } else {
        context.insert("model", model);
    }

    TERA.build_response("models/model_update", &context)
}

#[post("/model/object/update/{model_id}")]
pub(crate) async fn update(
    model_id: web::Path<ID>,
    form: web::Form<ObjectModelForm>,
    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_object_model(ObjectModel {
        id,
        name: form.name.clone(),
    }) {
        Ok(_id) => {
            wg.persist().err_to_500()?;
            debug!("Object updated, redirecting to root");
            session.flash_success(format!("Object model \"{}\" updated.", form.name));
            redirect("/models")
        }
        Err(e) => {
            warn!("Error updating model: {}", e);
            session.flash_error(e.to_string());
            session.set("old", form).unwrap();
            redirect(format!("/model/object/update/{}", id))
        }
    }
}

#[get("/model/object/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_object(
        id.parse()
            .map_err(|e| actix_web::error::ErrorBadRequest(e))?,
    ) {
        Ok(om) => {
            wg.persist().err_to_500()?;
            debug!("Object model deleted, redirecting to root");
            session.flash_success(format!("Object model \"{}\" deleted.", om.name));
            redirect("/models")
        }
        Err(e) => {
            warn!("Error deleting object model: {}", e);
            session.flash_error(e.to_string());
            redirect("/models") // back?
        }
    }
}