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use std::{borrow::Cow, iter, sync::Arc};

use axum::{extract::State, response::IntoResponse};
use futures::stream::{FuturesUnordered, StreamExt};
use prometheus_client::{
    metrics::{gauge::ConstGauge, info::Info},
    registry::Registry,
};
use url::Url;

use crate::{
    config_file::ExporterConfig,
    mikrotik_api::clock::Clock,
    prometheus_ext::AsMetrics,
    with_timezone::WithTimezoneTrait,
    AppState,
    MikrotikClient,
};

#[tracing::instrument(skip(state), level = "debug", err)]
pub async fn export_metrics(
    State(state): State<Arc<AppState>>,
) -> Result<impl IntoResponse, String> {
    let router_results = state
        .routers
        .iter()
        .filter(|(_, _, exporter_config)| exporter_config.enabled)
        .map(scrape_router)
        .collect::<FuturesUnordered<_>>()
        .collect::<Vec<_>>()
        .await;

    let mut metrics_registry = Registry::with_prefix("mikrotik_ros");

    for (name, endpoint, metrics) in router_results {
        let router_registry = metrics_registry.sub_registry_with_label((
            Cow::from("target"),
            Cow::from(endpoint.authority().to_owned()),
        ));

        router_registry.register(
            "target_name",
            "Name of the target router from exporter configuration",
            Info::new([("target_name", name.clone())]),
        );

        let mut success = |s: u32| {
            router_registry.register(
                "scrape_success",
                "Was the scrape successful",
                ConstGauge::new(s),
            );
        };

        let (clock, metrics) = match metrics {
            Err(error) => {
                tracing::error!(
                    endpoint = display(endpoint),
                    router_name = display(name),
                    error = %error,
                    error.debug = ?error,
                    "Failed to export metrics"
                );
                success(0);
                continue;
            },
            Ok(metrics) => metrics,
        };
        success(1);

        Box::new(clock).register_as_metrics(router_registry);

        for metric in metrics {
            metric.register_as_metrics(router_registry);
        }
    }


    let mut out = String::new();
    prometheus_client::encoding::text::encode(&mut out, &metrics_registry)
        .map_err(|e| format!("Failed to encode metrics. See log\n\n{e}"))?;

    Ok(out)
}

#[allow(clippy::as_conversions)]
async fn scrape_router(
    params: &(String, MikrotikClient, ExporterConfig),
) -> (
    String,
    Url,
    anyhow::Result<(Clock, Vec<Box<dyn AsMetrics + Send>>)>,
) {
    let name = params.0.clone();
    let api = &params.1;
    let endpoint = api.endpoint().clone();
    let clock = api.get_clock().await;

    let clock = match clock {
        Ok(clock) => clock,
        Err(err) => return (name, endpoint, Err(err)),
    };

    let metrics: anyhow::Result<(Clock, Vec<Box<dyn AsMetrics + Send>>)> = async {
        let metrics: Vec<Box<dyn AsMetrics + Send>> =
            iter::once(Box::new(api.get_identity().await?) as Box<dyn AsMetrics + Send>)
                .chain(api.get_interfaces().await?.into_iter().map(
                    |i| -> Box<dyn AsMetrics + Send> {
                        Box::new(i.with_timezone(clock.gmt_offset))
                    },
                ))
                .chain(iter::once(
                    Box::new(api.get_resource().await?) as Box<dyn AsMetrics + Send>
                ))
                .chain(
                    api.get_health()
                        .await?
                        .into_iter()
                        .map(|h| -> Box<dyn AsMetrics + Send> { Box::new(h) }),
                )
                .chain(api.get_ethernet_and_monitor().await?.into_iter().flat_map(
                    |(eth, monitor)| -> [Box<dyn AsMetrics + Send>; 2] {
                        [Box::new(eth), Box::new(monitor)]
                    },
                ))
                .collect();

        Ok((clock, metrics))
    }
    .await;

    (name, endpoint, metrics)
}