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use crate::{
    chunk_generator::ChunkGenerator,
    metrics::{EcsSystemMetrics, JobMetrics, PhysicsMetrics, QueryServerMetrics, TickMetrics},
    HwStats, Tick, TickStart,
};
use common::{resources::TimeOfDay, slowjob::SlowJobPool, terrain::TerrainGrid};
use common_ecs::{Job, Origin, Phase, SysMetrics, System};
use specs::{Entities, Join, Read, ReadExpect};
use std::{
    sync::{Arc, Mutex},
    time::Instant,
};
use veloren_query_server::server::Metrics as RawQueryServerMetrics;

/// This system exports metrics
#[derive(Default)]
pub struct Sys;
impl<'a> System<'a> for Sys {
    type SystemData = (
        Entities<'a>,
        ReadExpect<'a, HwStats>,
        ReadExpect<'a, Tick>,
        ReadExpect<'a, TimeOfDay>,
        ReadExpect<'a, TickStart>,
        ReadExpect<'a, ChunkGenerator>,
        Option<Read<'a, TerrainGrid>>,
        Read<'a, SysMetrics>,
        Read<'a, common_ecs::PhysicsMetrics>,
        ReadExpect<'a, SlowJobPool>,
        ReadExpect<'a, EcsSystemMetrics>,
        ReadExpect<'a, TickMetrics>,
        ReadExpect<'a, PhysicsMetrics>,
        ReadExpect<'a, JobMetrics>,
        Option<Read<'a, Arc<Mutex<RawQueryServerMetrics>>>>,
        ReadExpect<'a, QueryServerMetrics>,
    );

    const NAME: &'static str = "metrics";
    const ORIGIN: Origin = Origin::Server;
    const PHASE: Phase = Phase::Apply;

    fn run(
        _job: &mut Job<Self>,
        (
            entities,
            hw_stats,
            tick,
            time_of_day,
            tick_start,
            chunk_generator,
            terrain,
            sys_metrics,
            phys_metrics,
            slowjobpool,
            export_ecs,
            export_tick,
            export_physics,
            export_jobs,
            raw_query_server,
            export_query_server,
        ): Self::SystemData,
    ) {
        const NANOSEC_PER_SEC: f64 = std::time::Duration::from_secs(1).as_nanos() as f64;

        let start = Instant::now();

        let mut state = sys_metrics.stats.lock().unwrap();
        //this system hasn't run yet
        state.remove(Self::NAME);

        for (name, stat) in common_ecs::gen_stats(
            &state,
            tick_start.0,
            hw_stats.rayon_threads,
            hw_stats.hardware_threads,
        ) {
            export_ecs
                .system_start_time
                .with_label_values(&[&name])
                .set(stat.start_ns() as i64);
            export_ecs
                .system_thread_avg
                .with_label_values(&[&name])
                .set(stat.avg_threads() as f64);
            let len = stat.length_ns();
            export_ecs
                .system_length_time
                .with_label_values(&[&name])
                .set(len as i64);
            export_ecs
                .system_length_count
                .with_label_values(&[&name])
                .inc_by(len);
            export_ecs
                .system_length_hist
                .with_label_values(&[&name])
                .observe(len as f64 / NANOSEC_PER_SEC);
        }

        // Report other info
        export_tick.time_of_day.set(time_of_day.0);
        if tick.0.rem_euclid(100) == 0 {
            if let Some(terrain) = terrain.as_ref() {
                let mut chonk_cnt = 0;
                let mut group_cnt = 0;
                let chunk_cnt = terrain.iter().fold(0, |a, (_, c)| {
                    chonk_cnt += 1;
                    group_cnt += c.sub_chunk_groups();
                    a + c.sub_chunks_len()
                });
                export_tick.chonks_count.set(chonk_cnt as i64);
                export_tick.chunks_count.set(chunk_cnt as i64);
                export_tick.chunk_groups_count.set(group_cnt as i64);
            }

            let entity_count = entities.join().count();
            export_tick.entity_count.set(entity_count as i64);
        }
        common_base::plot!("entity count", entities.join().count() as f64);
        common_base::plot!(
            "pending chunks",
            chunk_generator.pending_chunks().count() as f64
        );
        if let Some(terrain) = terrain.as_ref() {
            common_base::plot!("chunk count", terrain.iter().count() as f64);
        }

        //detailed physics metrics
        export_physics
            .entity_entity_collision_checks_count
            .inc_by(phys_metrics.entity_entity_collision_checks);
        export_physics
            .entity_entity_collisions_count
            .inc_by(phys_metrics.entity_entity_collisions);

        //detailed job metrics
        for (name, jobs) in slowjobpool.take_metrics() {
            let queried = export_jobs.job_queried_hst.with_label_values(&[&name]);
            let executed = export_jobs.job_execution_hst.with_label_values(&[&name]);
            for job in jobs {
                queried.observe(
                    job.execution_start
                        .duration_since(job.queue_created)
                        .as_secs_f64(),
                );
                executed.observe(
                    job.execution_end
                        .duration_since(job.execution_start)
                        .as_secs_f64(),
                );
            }
        }

        // export self time as best as possible
        export_ecs
            .system_start_time
            .with_label_values(&["metrics"])
            .set(start.duration_since(tick_start.0).as_nanos() as i64);
        export_ecs
            .system_thread_avg
            .with_label_values(&["metrics"])
            .set(1.0);
        let len = start.elapsed().as_nanos() as u64;
        export_ecs
            .system_length_time
            .with_label_values(&["metrics"])
            .set(len as i64);
        export_ecs
            .system_length_count
            .with_label_values(&["metrics"])
            .inc_by(len);
        export_ecs
            .system_length_hist
            .with_label_values(&["metrics"])
            .observe(len as f64 / NANOSEC_PER_SEC);

        if let Some(Ok(metrics)) = raw_query_server
            .as_ref()
            // Hold the lock for the shortest time possible
            .map(|m| m.lock().map(|mut metrics| metrics.reset()))
        {
            export_query_server.apply(metrics);
        }
    }
}