use lapin::{options::*, publisher_confirm::Confirmation, BasicProperties};

use crate::ingress::types::ingress_object::IngressObject;

use super::{RabbitMQCommon, RabbitMQCommonTrait, RabbitMQConfig, RabbitMQError};
use tracing::{error, info};

/// Struct to publish messages to RabbitMQ.
pub struct RabbitMQProducer {
    common: RabbitMQCommon,
    exchange_name: String,
    routing_key: String,
}

impl RabbitMQProducer {
    /// Creates a new `RabbitMQProducer` instance which sets up a RabbitMQ client,
    /// declares a exchange if needed.
    ///
    /// # Arguments
    /// * `config` - A initialized RabbitMQConfig containing required configurations
    ///
    /// # Returns
    /// * `Result<Self, RabbitMQError>` - The created client or an error.
    pub async fn new(config: &RabbitMQConfig) -> Result<Self, RabbitMQError> {
        let common = RabbitMQCommon::new(config).await?;
        common.declare_exchange(config, false).await?;

        Ok(Self {
            common,
            exchange_name: config.exchange.clone(),
            routing_key: config.routing_key.clone(),
        })
    }

    /// Publishes an IngressObject to RabbitMQ after serializing it to JSON.
    ///
    /// # Arguments
    /// * `self` - Reference to self
    /// * `ingress_object` - A initialized IngressObject
    ///
    /// # Returns
    /// * `Result<Confirmation, RabbitMQError>` - Confirmation of sent message or error
    pub async fn publish(
        &self,
        ingress_object: IngressObject,
    ) -> Result<Confirmation, RabbitMQError> {
        // Serialize IngressObject to JSON
        let payload = serde_json::to_vec(&ingress_object).map_err(|e| {
            error!("Serialization Error: {}", e);
            RabbitMQError::PublishError(format!("Serialization Error: {}", e))
        })?;

        // Publish the serialized payload to RabbitMQ
        let confirmation = self
            .common
            .channel
            .basic_publish(
                &self.exchange_name,
                &self.routing_key,
                BasicPublishOptions::default(),
                &payload,
                BasicProperties::default(),
            )
            .await
            .map_err(|e| {
                error!("Publish Error: {}", e);
                RabbitMQError::PublishError(format!("Publish Error: {}", e))
            })?
            .await
            .map_err(|e| {
                error!("Publish Confirmation Error: {}", e);
                RabbitMQError::PublishError(format!("Publish Confirmation Error: {}", e))
            })?;

        info!(
            "Published IngressObject to exchange '{}' with routing key '{}'",
            self.exchange_name, self.routing_key
        );

        Ok(confirmation)
    }
}