//! Cache-control tests count provider calls; they do not measure model relevance.
//! Production still loads Google and root runs separate real CPU benchmarks.
use anyhow::Result;
use searchi_core::{SearchIndex, SearchOptions};
use searchi_semantic::TextWindow;
use searchi_service::{EmbeddingProvider, HybridSearch};
use std::{
    collections::BTreeMap,
    sync::{
        atomic::{AtomicBool, Ordering},
        Arc, Mutex,
    },
};

#[derive(Default)]
struct Calls {
    queries: Mutex<Vec<String>>,
    fail: AtomicBool,
    invalid: AtomicBool,
    new_fingerprint: AtomicBool,
}
struct CountingProvider(Arc<Calls>);
impl EmbeddingProvider for CountingProvider {
    fn fingerprint(&self) -> &str {
        if self.0.new_fingerprint.load(Ordering::Relaxed) {
            "cache-control-v2"
        } else {
            "cache-control-v1"
        }
    }
    fn dimensions(&self) -> usize {
        768
    }
    fn split_windows(&mut self, _: &str, _: &str) -> Result<Vec<TextWindow>> {
        anyhow::bail!("Not used by cache-control tests")
    }
    fn embed_documents(&mut self, _: &[&str], _: &str) -> Result<Vec<Vec<f32>>> {
        anyhow::bail!("Not used by cache-control tests")
    }
    fn embed_query(&mut self, query: &str) -> Result<Vec<f32>> {
        self.0.queries.lock().unwrap().push(query.into());
        if self.0.fail.load(Ordering::Relaxed) {
            anyhow::bail!("Injected provider failure");
        }
        let mut vector = vec![0.0; 768];
        if !self.0.invalid.load(Ordering::Relaxed) {
            vector[0] = 1.0;
        }
        Ok(vector)
    }
    fn embed_code_query(&mut self, query: &str) -> Result<Vec<f32>> {
        self.embed_query(&format!("code-task:{query}"))
    }
    fn query_diagnostics(&self) -> BTreeMap<String, u64> {
        BTreeMap::from([("worker_inference_us".into(), 123)])
    }
}
fn fixture() -> Result<(tempfile::TempDir, HybridSearch, Arc<Calls>)> {
    let directory = tempfile::tempdir()?;
    let database = directory.path().join("index.db");
    let calls = Arc::new(Calls::default());
    let service = HybridSearch::with_provider(database, Box::new(CountingProvider(calls.clone())))?;
    Ok((directory, service, calls))
}
fn count(calls: &Calls) -> usize {
    calls.queries.lock().unwrap().len()
}

#[test]
fn query_task_scopes_cache_and_code_debug_never_replays_old_worker_counters() -> Result<()> {
    let (_directory, mut service, calls) = fixture()?;
    let normal = SearchOptions::default();
    let code = SearchOptions {
        code_only: true,
        ..Default::default()
    };
    service.search("parse JSON", 5, &normal)?;
    service.search("parse JSON", 5, &code)?;
    assert_eq!(
        *calls.queries.lock().unwrap(),
        vec!["parse JSON", "code-task:parse JSON"]
    );
    let cached = service.search_measured("parse JSON", 5, &code, true)?;
    assert_eq!(count(&calls), 2);
    let embedding = cached
        .metrics
        .trace
        .unwrap()
        .into_iter()
        .find(|s| s.name == "semantic.query_embedding")
        .unwrap();
    assert_eq!(embedding.counters["code_task"], 1);
    assert_eq!(embedding.counters["query_cache_hit"], 1);
    assert!(!embedding.counters.contains_key("worker_inference_us"));
    service.search("parse JSON", 5, &normal)?;
    assert_eq!(count(&calls), 2);
    Ok(())
}

#[test]
fn exact_trimmed_queries_reuse_vectors_but_case_and_model_fingerprint_do_not() -> Result<()> {
    let (_directory, mut service, calls) = fixture()?;
    let options = SearchOptions::default();
    service.search("  supplier  ", 5, &options)?;
    service.search("supplier", 5, &options)?;
    assert_eq!(*calls.queries.lock().unwrap(), vec!["supplier"]);
    service.search("Supplier", 5, &options)?;
    assert_eq!(count(&calls), 2);
    calls.new_fingerprint.store(true, Ordering::Relaxed);
    service.search("supplier", 5, &options)?;
    assert_eq!(count(&calls), 3);
    Ok(())
}

#[test]
fn filters_and_changed_index_are_recomputed_even_when_vector_is_reused() -> Result<()> {
    let (directory, mut service, calls) = fixture()?;
    std::fs::write(directory.path().join("first.txt"), "supplier notice")?;
    std::fs::write(directory.path().join("second.md"), "supplier notice")?;
    let mut index = SearchIndex::open(directory.path().join("index.db"))?;
    index.index_folder(directory.path())?;
    let txt = SearchOptions {
        extension: Some("txt".into()),
        ..Default::default()
    };
    let md = SearchOptions {
        extension: Some("md".into()),
        ..Default::default()
    };
    assert_eq!(
        service.search("supplier", 5, &txt)?[0].filename,
        "first.txt"
    );
    assert_eq!(service.search("supplier", 5, &md)?[0].filename, "second.md");
    assert_eq!(count(&calls), 1);
    std::fs::remove_file(directory.path().join("first.txt"))?;
    index.index_folder(directory.path())?;
    assert!(service.search("supplier", 5, &txt)?.is_empty());
    assert_eq!(count(&calls), 1);
    Ok(())
}

#[test]
fn cache_hit_trace_never_replays_prior_worker_diagnostics() -> Result<()> {
    let (_directory, mut service, _calls) = fixture()?;
    let miss = service.search_measured("supplier", 5, &SearchOptions::default(), true)?;
    let hit = service.search_measured("supplier", 5, &SearchOptions::default(), true)?;
    let miss = miss
        .metrics
        .trace
        .unwrap()
        .into_iter()
        .find(|span| span.name == "semantic.query_embedding")
        .unwrap();
    let hit = hit
        .metrics
        .trace
        .unwrap()
        .into_iter()
        .find(|span| span.name == "semantic.query_embedding")
        .unwrap();
    assert_eq!(miss.counters["query_cache_miss"], 1);
    assert_eq!(miss.counters["worker_inference_us"], 123);
    assert_eq!(hit.counters["query_cache_hit"], 1);
    assert_eq!(hit.counters["query_cache_miss"], 0);
    assert!(!hit.counters.contains_key("worker_inference_us"));
    assert_eq!(hit.counters["failed"], 0);
    Ok(())
}

#[test]
fn failures_and_invalid_vectors_are_not_cached() -> Result<()> {
    let (_directory, mut service, calls) = fixture()?;
    assert!(service
        .search_semantic(&"界".repeat(2000), 5, &SearchOptions::default())
        .is_err());
    assert_eq!(
        count(&calls),
        0,
        "Oversized query must not reach the provider or cache"
    );
    calls.fail.store(true, Ordering::Relaxed);
    for _ in 0..2 {
        assert!(service
            .search("supplier", 5, &SearchOptions::default())
            .is_err());
    }
    calls.fail.store(false, Ordering::Relaxed);
    calls.invalid.store(true, Ordering::Relaxed);
    for _ in 0..2 {
        assert!(service
            .search("supplier", 5, &SearchOptions::default())
            .is_err());
    }
    calls.invalid.store(false, Ordering::Relaxed);
    service.search("supplier", 5, &SearchOptions::default())?;
    service.search("supplier", 5, &SearchOptions::default())?;
    assert_eq!(count(&calls), 5);
    Ok(())
}

#[test]
fn cache_evicts_least_recently_used_query_at_32_entries() -> Result<()> {
    let (_directory, mut service, calls) = fixture()?;
    for number in 0..32 {
        service.search(&format!("query{number}"), 5, &SearchOptions::default())?;
    }
    service.search("query0", 5, &SearchOptions::default())?;
    service.search("query32", 5, &SearchOptions::default())?;
    service.search("query0", 5, &SearchOptions::default())?;
    assert_eq!(count(&calls), 33);
    service.search("query1", 5, &SearchOptions::default())?;
    assert_eq!(count(&calls), 34);
    Ok(())
}

#[test]
fn warmup_bypasses_cache_and_never_seeds_an_unseen_measured_query() -> Result<()> {
    let (_directory, mut service, calls) = fixture()?;
    service.warmup()?;
    assert_eq!(count(&calls), 1);
    let first = service.search_measured(
        "warm up local file search",
        5,
        &SearchOptions::default(),
        true,
    )?;
    assert_eq!(count(&calls), 2);
    let span = first
        .metrics
        .trace
        .unwrap()
        .into_iter()
        .find(|span| span.name == "semantic.query_embedding")
        .unwrap();
    assert_eq!(span.counters["query_cache_miss"], 1);
    service.warmup()?;
    assert_eq!(count(&calls), 3);
    service.search("warm up local file search", 5, &SearchOptions::default())?;
    assert_eq!(count(&calls), 3);
    Ok(())
}