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use vector_lib::{event::Event, partition::Partitioner};

use crate::{internal_events::TemplateRenderingError, template::Template};

#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct ChroniclePartitionKey {
    pub log_type: String,
    pub namespace: Option<String>,
}

/// Partitions items based on the generated key for the given event.
pub struct ChroniclePartitioner(Template, Option<Template>);

impl ChroniclePartitioner {
    pub const fn new(log_type_template: Template, namespace_template: Option<Template>) -> Self {
        Self(log_type_template, namespace_template)
    }
}

impl Partitioner for ChroniclePartitioner {
    type Item = Event;
    type Key = Option<ChroniclePartitionKey>;

    fn partition(&self, item: &Self::Item) -> Self::Key {
        let log_type = self
            .0
            .render_string(item)
            .map_err(|error| {
                emit!(TemplateRenderingError {
                    error,
                    field: Some("log_type"),
                    drop_event: true,
                });
            })
            .ok()?;
        let namespace = self
            .1
            .as_ref()
            .map(|namespace| {
                namespace.render_string(item).map_err(|error| {
                    emit!(TemplateRenderingError {
                        error,
                        field: Some("namespace"),
                        drop_event: true,
                    });
                })
            })
            .transpose()
            .ok()?;
        Some(ChroniclePartitionKey {
            log_type,
            namespace,
        })
    }
}