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use std::collections::BTreeMap;

use itertools::Itertools as _;
use re_chunk_store::ChunkStoreDiffKind;
use re_chunk_store::{ChunkStoreEvent, ChunkStoreSubscriber};
use re_log_types::Timeline;

// ---

/// Number of messages per time.
pub type TimeHistogram = re_int_histogram::Int64Histogram;

/// Number of messages per time per timeline.
///
/// Does NOT include timeless.
#[derive(Default)]
pub struct TimeHistogramPerTimeline {
    /// When do we have data? Ignores timeless.
    times: BTreeMap<Timeline, TimeHistogram>,

    /// Extra bookkeeping used to seed any timelines that include static msgs.
    num_static_messages: u64,
}

impl TimeHistogramPerTimeline {
    #[inline]
    pub fn is_empty(&self) -> bool {
        self.times.is_empty() && self.num_static_messages == 0
    }

    #[inline]
    pub fn is_static(&self) -> bool {
        self.num_static_messages > 0
    }

    #[inline]
    pub fn timelines(&self) -> impl ExactSizeIterator<Item = &Timeline> {
        self.times.keys()
    }

    #[inline]
    pub fn get(&self, timeline: &Timeline) -> Option<&TimeHistogram> {
        self.times.get(timeline)
    }

    #[inline]
    pub fn has_timeline(&self, timeline: &Timeline) -> bool {
        self.times.contains_key(timeline)
    }

    #[inline]
    pub fn iter(&self) -> impl ExactSizeIterator<Item = (&Timeline, &TimeHistogram)> {
        self.times.iter()
    }

    #[inline]
    pub fn num_static_messages(&self) -> u64 {
        self.num_static_messages
    }

    /// Total number of temporal messages over all timelines.
    pub fn num_temporal_messages(&self) -> u64 {
        self.times.values().map(|hist| hist.total_count()).sum()
    }

    pub fn add(&mut self, times_per_timeline: &[(Timeline, &[i64])], n: u32) {
        re_tracing::profile_function!();

        if times_per_timeline.is_empty() {
            self.num_static_messages = self
                .num_static_messages
                .checked_add(n as u64)
                .unwrap_or_else(|| {
                    re_log::debug!(
                        current = self.num_static_messages,
                        added = n,
                        "bookkeeping overflowed"
                    );
                    u64::MAX
                });
        } else {
            for &(timeline, times) in times_per_timeline {
                let histogram = self.times.entry(timeline).or_default();
                for &time in times {
                    histogram.increment(time, n);
                }
            }
        }
    }

    pub fn remove(&mut self, times_per_timeline: &[(Timeline, &[i64])], n: u32) {
        re_tracing::profile_function!();

        if times_per_timeline.is_empty() {
            self.num_static_messages = self
                .num_static_messages
                .checked_sub(n as u64)
                .unwrap_or_else(|| {
                    // We used to hit this on plots demo, see https://github.com/rerun-io/rerun/issues/4355.
                    re_log::debug!(
                        current = self.num_static_messages,
                        removed = n,
                        "bookkeeping underflowed"
                    );
                    u64::MIN
                });
        } else {
            for &(timeline, times) in times_per_timeline {
                if let Some(histo) = self.times.get_mut(&timeline) {
                    for &time in times {
                        histo.decrement(time, n);
                    }
                    if histo.is_empty() {
                        self.times.remove(&timeline);
                    }
                }
            }
        }
    }
}

// NOTE: This is only to let people know that this is in fact a [`ChunkStoreSubscriber`], so they A) don't try
// to implement it on their own and B) don't try to register it.
impl ChunkStoreSubscriber for TimeHistogramPerTimeline {
    #[inline]
    fn name(&self) -> String {
        "rerun.store_subscriber.TimeHistogramPerTimeline".into()
    }

    #[inline]
    fn as_any(&self) -> &dyn std::any::Any {
        self
    }

    #[inline]
    fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
        self
    }

    #[allow(clippy::unimplemented)]
    fn on_events(&mut self, events: &[ChunkStoreEvent]) {
        re_tracing::profile_function!();

        for event in events {
            let times = event
                .chunk
                .timelines()
                .iter()
                .map(|(&timeline, time_column)| (timeline, time_column.times_raw()))
                .collect_vec();
            match event.kind {
                ChunkStoreDiffKind::Addition => {
                    self.add(&times, event.num_components() as _);
                }
                ChunkStoreDiffKind::Deletion => {
                    self.remove(&times, event.num_components() as _);
                }
            }
        }
    }
}