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

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

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

#[get("/model/property/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 = {
        let id = object_id.parse_or_bad_request()?;
        debug!("Create property for ID={}", id);
        if let Some(om) = rg.get_object_model(id) {
            ObjectOrRelationModelDisplay {
                id: om.id,
                describe: format!("object model \"{}\"", om.name),
            }
        } else if let Some(rm) = rg.get_relation_model(id) {
            ObjectOrRelationModelDisplay {
                id: rm.id,
                describe: format!("relation model \"{}\"", rm.name),
            }
        } else {
            return Err(actix_web::error::ErrorNotFound("No such source object"));
        }
    };

    context.insert("object", &object);
    TERA.build_response("property_create", &context)
}

#[derive(Deserialize)]
pub(crate) struct PropertyModelCreate {
    pub object: ID,
    pub name: String,
    #[serde(default)]
    pub optional: bool,
    #[serde(default)]
    pub multiple: bool,
    pub data_type: DataType,
    /// Default value to be parsed to the data type
    /// May be unused if empty and optional
    pub default: String,
}

#[post("/model/property/create")]
pub(crate) async fn create(
    form: web::Form<PropertyModelCreate>,
    store: crate::YopaStoreWrapper,
    session: Session,
) -> actix_web::Result<impl Responder> {
    let mut wg = store.write().await;
    let form = form.into_inner();

    let optional = form.optional;
    let multiple = form.multiple;

    match wg.define_property(PropertyModel {
        id: Default::default(),
        object: form.object,
        name: form.name.clone(),
        optional,
        multiple,
        data_type: form.data_type,
        default: {
            match form.data_type {
                DataType::String => {
                    if form.default.is_empty() && optional {
                        None
                    } else {
                        Some(TypedValue::String(form.default.into()))
                    }
                }
                DataType::Integer => {
                    if form.default.is_empty() {
                        if optional {
                            None
                        } else {
                            Some(TypedValue::Integer(0))
                        }
                    } else {
                        // TODO better error reporting
                        Some(TypedValue::Integer(form.default.parse()
                            .map_err(|_| {
                                actix_web::error::ErrorBadRequest(format!("Error parsing \"{}\" as integer", form.default))
                            })?))
                    }
                }
                DataType::Decimal => {
                    if form.default.is_empty() {
                        if optional {
                            None
                        } else {
                            Some(TypedValue::Decimal(0.0))
                        }
                    } else {
                        // TODO better error reporting
                        Some(TypedValue::Decimal(form.default.parse()
                            .map_err(|_| {
                                actix_web::error::ErrorBadRequest(format!("Error parsing \"{}\" as decimal", form.default))
                            })?))
                    }
                }
                DataType::Boolean => {
                    if form.default.is_empty() {
                        if optional {
                            None
                        } else {
                            Some(TypedValue::Boolean(false))
                        }
                    } else {
                        Some(TypedValue::String(form.default.clone().into())
                            .cast_to(DataType::Boolean).map_err(|_| {
                            actix_web::error::ErrorBadRequest(format!("Error parsing \"{}\" as boolean", form.default))
                        })?)
                    }
                }
            }
        },
    }) {
        Ok(_id) => {
            debug!("Property created, redirecting to root");
            session.flash_success(format!("Property model \"{}\" created.", form.name));
            redirect("/")
        }
        Err(e) => {
            warn!("Error creating property model: {:?}", e);
            session.flash_error(e.to_string());
            redirect(format!("/model/property/create/{}", form.object))
        }
    }
}

#[get("/model/property/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_property(id.parse_or_bad_request()?) {
        Ok(rm) => {
            debug!("Property deleted, redirecting to root");
            session.flash_success(format!("Property \"{}\" deleted.", rm.name));
            redirect("/")
        }
        Err(e) => {
            warn!("Error deleting property: {:?}", e);
            session.flash_error(e.to_string());
            redirect("/") // back?
        }
    }
}