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use lazy_static::lazy_static;
use prometheus_client::{
    metrics::histogram::Histogram,
    registry::Registry,
};
use std::{
    boxed::Box,
    default::Default,
};

pub struct TxPoolMetrics {
    // Attaches each Metric to the Registry
    pub registry: Registry,
    pub gas_price_histogram: Histogram,
    pub tx_size_histogram: Histogram,
}

impl Default for TxPoolMetrics {
    fn default() -> Self {
        let registry = Registry::default();

        let gas_prices = Vec::new();

        let gas_price_histogram = Histogram::new(gas_prices.into_iter());

        let tx_sizes = Vec::new();

        let tx_size_histogram = Histogram::new(tx_sizes.into_iter());

        let mut metrics = TxPoolMetrics {
            registry,
            gas_price_histogram,
            tx_size_histogram,
        };

        metrics.registry.register(
            "Tx_Gas_Price_Histogram",
            "A Histogram keeping track of all gas prices for each tx in the mempool",
            Box::new(metrics.gas_price_histogram.clone()),
        );

        metrics.registry.register(
            "Tx_Size_Histogram",
            "A Histogram keeping track of the size of txs",
            Box::new(metrics.tx_size_histogram.clone()),
        );

        metrics
    }
}

lazy_static! {
    pub static ref TXPOOL_METRICS: TxPoolMetrics = TxPoolMetrics::default();
}