use crate::{Context, Handler};
use actix_web::{post, web, HttpResponse, Responder};
use serde::Deserialize;
use serde_json::json;
use verax::{RevId, Status, Tag, TokenPayload};

#[derive(Deserialize)]
pub struct UpdateOperation {
    #[serde(default)]
    pub status: Option<Status>,
    #[serde(default)]
    pub tags: Option<Vec<Tag>>,
    pub memo: String,
    pub update_token: Option<TokenPayload>,
}

struct Update {
    id: RevId,
    operation: UpdateOperation,
}

#[async_trait::async_trait]
impl Handler for Update {
    type Ok = verax::Transaction;
    type Err = verax::Error;

    async fn handle(self, ledger: &Context) -> Result<Self::Ok, Self::Err> {
        let id = self.id;
        let memo = self.operation.memo;
        let update_token = self.operation.update_token;

        let id = if let Some(status) = self.operation.status {
            let transaction = ledger
                .ledger
                .change_status(id, status, memo.clone(), update_token.clone())
                .await?;
            transaction.revision_id
        } else {
            id
        };

        let id = if let Some(tags) = self.operation.tags {
            let transaction = ledger.ledger.set_tags(id, tags, memo, update_token).await?;
            transaction.revision_id
        } else {
            id
        };

        ledger
            .ledger
            .get_transactions(verax::Filter {
                revisions: vec![id],
                limit: 1,
                ..Default::default()
            })
            .await?
            .pop()
            .ok_or(verax::Error::TxNotFound)
    }
}

#[post("/{id}")]
async fn handler(
    info: web::Path<RevId>,
    item: web::Json<UpdateOperation>,
    ctx: web::Data<Context>,
) -> impl Responder {
    let update = Update {
        id: info.into_inner(),
        operation: item.into_inner(),
    };
    match update.handle(&ctx).await {
        Ok(tx) => HttpResponse::Accepted().json(tx),
        Err(err) => {
            HttpResponse::InternalServerError().json(json!({ "text": err.to_string(), "err": err}))
        }
    }
}