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;

    // Re-fill old values
    if let Ok(Some(form)) = session.take::<PropertyModelCreateForm>("old") {
        context.insert("old", &form);
    } else {
        context.insert("old", &PropertyModelCreateForm {
            object: Default::default(),
            name: "".to_string(),
            optional: false,
            multiple: false,
            data_type: DataType::String,
            default: "".to_string()
        });
    }

    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(Serialize,Deserialize)]
pub(crate) struct PropertyModelCreateForm {
    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,
}

fn parse_default(data_type : DataType, default : String) -> Result<TypedValue, String> {
    Ok(match data_type {
        DataType::String => {
            TypedValue::String(default.into())
        }
        DataType::Integer => {
            if default.is_empty() {
                TypedValue::Integer(0)
            } else {
                // TODO better error reporting
                TypedValue::Integer(default.parse()
                    .map_err(|_| {
                        format!("Error parsing \"{}\" as integer", default)
                    })?)
            }
        }
        DataType::Decimal => {
            if default.is_empty() {
                TypedValue::Decimal(0.0)
            } else {
                // TODO better error reporting
                TypedValue::Decimal(default.parse()
                    .map_err(|_| {
                        format!("Error parsing \"{}\" as decimal", default)
                    })?)
            }
        }
        DataType::Boolean => {
            if default.is_empty() {
                TypedValue::Boolean(false)
            } else {
                TypedValue::String(default.clone().into())
                    .cast_to(DataType::Boolean).map_err(|_| {
                    format!("Error parsing \"{}\" as boolean", default)
                })?
            }
        }
    })
}

#[post("/model/property/create")]
pub(crate) async fn create(
    form: web::Form<PropertyModelCreateForm>,
    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;

    let default = match parse_default(form.data_type, form.default.clone()) {
        Ok(def) => def,
        Err(msg) => {
            warn!("{}", msg);
            session.flash_error(msg);
            session.set("old", &form);
            return redirect(format!("/model/property/create/{}", form.object));
        }
    };

    match wg.define_property(PropertyModel {
        id: Default::default(),
        object: form.object,
        name: form.name.clone(),
        optional,
        multiple,
        data_type: form.data_type,
        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());
            session.set("old", &form);
            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?
        }
    }
}

#[derive(Serialize, Deserialize)]
pub(crate) struct PropertyModelEditForm {
    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,
}


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

    // Re-fill old values
    if let Ok(Some(form)) = session.take::<PropertyModelEditForm>("old") {
        let mut model = model.clone();
        model.name = form.name;
        model.data_type = form.data_type;
        model.default = TypedValue::String(form.default.into());
        model.optional = form.optional;
        model.multiple = form.multiple;
        context.insert("model", &model);
    } else {
        context.insert("model", model);
    }

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

#[post("/model/property/update/{model_id}")]
pub(crate) async fn update(
    model_id: web::Path<ID>,
    form: web::Form<PropertyModelEditForm>,
    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();
    let default = match parse_default(form.data_type, form.default.clone()) {
        Ok(def) => def,
        Err(msg) => {
            warn!("{}", msg);
            session.flash_error(msg);
            session.set("old", form);
            return redirect(format!("/model/property/update/{}", id));
        }
    };

    match wg.update_property(PropertyModel {
        id,
        object: Default::default(), // dummy
        name: form.name.clone(),
        optional: form.optional,
        multiple: form.multiple,
        data_type: form.data_type,
        default,
    }) {
        Ok(_id) => {
            debug!("Relation updated, redirecting to root");
            session.flash_success(format!("Property \"{}\" 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))
        }
    }
}