shield 0.3.0

use std::any::Any;

use crate::{
    error::ShieldError,
    form::Form,
    provider::Provider,
    request::{Request, RequestMethod},
    response::Response,
    session::{BaseSession, MethodSession},
};
use async_trait::async_trait;
use serde::{Deserialize, Serialize};

#[async_trait]
pub trait Action: Send + Sync {
    fn id(&self) -> &'static str;

    fn name(&self) -> &'static str;

    fn openapi_summary(&self) -> &'static str;

    fn openapi_description(&self) -> &'static str;

    fn method(&self) -> RequestMethod;

    async fn forms(&self) -> Result<Vec<Form>, ShieldError>;

    async fn call(&self, session: &BaseSession, request: Request) -> Result<Response, ShieldError>;
}

// TODO: Think of a better name.
#[derive(Clone, Debug, Deserialize, Serialize)]
#[cfg_attr(feature = "utoipa", derive(utoipa::ToSchema))]
#[serde(rename_all = "camelCase")]
pub struct ActionForms {
    pub id: String,
    pub name: String,
    pub forms: Vec<Form>,
    pub method_forms: Vec<ActionMethodForm>,
}

// TODO: Think of a better name.
#[derive(Clone, Debug, Deserialize, PartialEq, Serialize)]
#[cfg_attr(feature = "utoipa", derive(utoipa::ToSchema))]
#[serde(rename_all = "camelCase")]
pub struct ActionMethodForm {
    pub id: String,
    pub provider_forms: Vec<ActionProviderForm>,
}

// TODO: Think of a better name.
#[derive(Clone, Debug, Deserialize, PartialEq, Serialize)]
#[cfg_attr(feature = "utoipa", derive(utoipa::ToSchema))]
#[serde(rename_all = "camelCase")]
pub struct ActionProviderForm {
    pub id: Option<String>,
    pub form: Form,
}

#[async_trait]
pub trait MethodAction<P: Provider, S>: ErasedMethodAction + Send + Sync {
    fn id(&self) -> String;

    fn name(&self) -> String;

    fn openapi_summary(&self) -> &'static str;

    fn openapi_description(&self) -> &'static str;

    fn method(&self) -> RequestMethod;

    fn condition(&self, _provider: &P, _session: &MethodSession<S>) -> Result<bool, ShieldError> {
        Ok(true)
    }

    async fn forms(&self, provider: P) -> Result<Vec<Form>, ShieldError>;

    async fn call(
        &self,
        provider: P,
        session: &MethodSession<S>,
        request: Request,
    ) -> Result<Response, ShieldError>;
}

#[async_trait]
pub trait ErasedMethodAction: Send + Sync {
    fn erased_id(&self) -> String;

    fn erased_name(&self) -> String;

    fn erased_openapi_summary(&self) -> &'static str;

    fn erased_openapi_description(&self) -> &'static str;

    fn erased_method(&self) -> RequestMethod;

    fn erased_condition(
        &self,
        provider: &(dyn Any + Send + Sync),
        base_session: &BaseSession,
        method_session: &(dyn Any + Send + Sync),
    ) -> Result<bool, ShieldError>;

    async fn erased_forms(
        &self,
        provider: Box<dyn Any + Send + Sync>,
    ) -> Result<Vec<Form>, ShieldError>;

    async fn erased_call(
        &self,
        provider: Box<dyn Any + Send + Sync>,
        base_session: &BaseSession,
        method_session: &(dyn Any + Send + Sync),
        request: Request,
    ) -> Result<Response, ShieldError>;
}

#[macro_export]
macro_rules! erased_method_action {
    ($action:ident $(, < $( $generic_name:ident : $generic_type:ident ),+ > )*) => {
        #[async_trait]
        impl $( < $( $generic_name: $generic_type + 'static ),+ > )* $crate::ErasedMethodAction for $action $( < $( $generic_name ),+ > )* {
            fn erased_id(&self) -> String {
                self.id()
            }

            fn erased_name(&self) -> String {
                self.name()
            }

            fn erased_openapi_summary(&self) -> &'static str {
                self.openapi_summary()
            }

            fn erased_openapi_description(&self) -> &'static str {
                self.openapi_description()
            }

            fn erased_method(&self) -> $crate::RequestMethod {
                self.method()
            }

            fn erased_condition(
                &self,
                provider: &(dyn std::any::Any + Send + Sync),
                base_session: &$crate::BaseSession,
                method_session: &(dyn std::any::Any + Send + Sync)
            ) -> Result<bool, $crate::ShieldError> {
                self.condition(
                    provider.downcast_ref().expect("Provider should be downcast"),
                    &MethodSession {
                        base: base_session,
                        method: method_session.downcast_ref().expect("Session should be downcast"),
                    },
                )
            }

            async fn erased_forms(
                &self,
                provider: Box<dyn std::any::Any + Send + Sync>
            ) -> Result<Vec<$crate::Form>, $crate::ShieldError> {
                self.forms(*provider.downcast().expect("Provider should be downcast")).await
            }

            async fn erased_call(
                &self,
                provider: Box<dyn std::any::Any + Send + Sync>,
                base_session: &$crate::BaseSession,
                method_session: &(dyn std::any::Any + Send + Sync),
                request: $crate::Request,
            ) -> Result<$crate::Response, $crate::ShieldError> {
                self
                    .call(
                        *provider.downcast().expect("Provider should be downcast"),
                        &$crate::MethodSession {
                            base: base_session,
                            method: method_session.downcast_ref().expect("Session should be downcast"),
                        },
                        request
                    )
                    .await
            }
        }
    };
}