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// Copyright Materialize, Inc. and contributors. All rights reserved.
//
// Use of this software is governed by the Business Source License
// included in the LICENSE file.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0.

use expr::GlobalId;
use ore::metrics::MetricsRegistry;
use ore::{
    metric,
    metrics::{raw::UIntCounterVec, raw::UIntGaugeVec, UIntGauge},
};

use crate::decode::{DataDecoderInner, PreDelimitedFormat};

/// Metrics specific to a single worker.
#[derive(Clone, Debug)]
pub struct Metrics {
    events_read: UIntCounterVec,
    debezium_upsert_count: UIntGaugeVec,
}

impl Metrics {
    pub fn register_with(registry: &MetricsRegistry) -> Self {
        Self {
            events_read: registry.register(metric!(
                name: "mz_dataflow_events_read_total",
                help: "Count of events we have read from the wire",
                var_labels: ["format", "status"],
            )),
            debezium_upsert_count: registry.register(metric!(
                        name: "mz_source_debezium_upsert_state_size",
                        help: "The number of keys that we are tracking in an upsert map.",
                        var_labels: ["source_id", "worker_id"],
            )),
        }
    }

    fn counter_inc(&self, decoder: &DataDecoderInner, success: bool, n: usize) {
        let format_label = match decoder {
            DataDecoderInner::Avro(_) => "avro",
            DataDecoderInner::Csv(_) => "csv",
            DataDecoderInner::DelimitedBytes { format, .. }
            | DataDecoderInner::PreDelimited(format) => match format {
                PreDelimitedFormat::Bytes => "raw",
                PreDelimitedFormat::Text => "text",
                PreDelimitedFormat::Regex(..) => "regex",
                PreDelimitedFormat::Protobuf(..) => "protobuf",
            },
        };
        let success_label = if success { "success" } else { "error" };
        self.events_read
            .with_label_values(&[format_label, success_label])
            .inc_by(n as u64);
    }

    pub(crate) fn count_successes(&self, decoder: &DataDecoderInner, n: usize) {
        self.counter_inc(decoder, true, n);
    }

    pub(crate) fn count_errors(&self, decoder: &DataDecoderInner, n: usize) {
        self.counter_inc(decoder, true, n);
    }

    pub(crate) fn debezium_upsert_count_for(
        &self,
        src_id: GlobalId,
        dataflow_id: usize,
    ) -> UIntGauge {
        self.debezium_upsert_count
            .with_label_values(&[&src_id.to_string(), &dataflow_id.to_string()])
    }
}