zipora 4.0.0

High-performance Rust implementation providing advanced data structures and compression algorithms with memory safety guarantees. Features LRU page cache, sophisticated caching layer, fiber-based concurrency, real-time compression, secure memory pools, SIMD optimizations, and complete C FFI for migration from C++.
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use super::*;
use crate::succinct::RankSelectInterleaved256;

#[test]
fn test_unified_trie_creation() {
    let trie: ZiporaTrie = ZiporaTrie::new();
    assert_eq!(trie.len(), 0);
    assert!(trie.is_empty());
}

#[test]
fn test_cache_optimized_config() {
    let trie: ZiporaTrie = ZiporaTrie::with_config(ZiporaTrieConfig::cache_optimized());
    assert!(trie.is_cache_optimized());
}

#[test]
fn test_space_optimized_insert_returns_not_supported() {
    let mut trie: ZiporaTrie = ZiporaTrie::with_config(ZiporaTrieConfig::space_optimized());
    assert_eq!(trie.len(), 0);
    let err = trie.insert(b"hello").unwrap_err();
    assert!(
        matches!(err, crate::error::ZiporaError::NotSupported { .. }),
        "LOUDS insert must return NotSupported, got: {err}",
    );
    assert!(!trie.contains(b"hello"));
}

#[test]
fn test_string_specialized_insert_returns_not_supported() {
    let mut trie: ZiporaTrie = ZiporaTrie::with_config(ZiporaTrieConfig::string_specialized());
    assert_eq!(trie.len(), 0);
    let err = trie.insert(b"hello").unwrap_err();
    assert!(
        matches!(err, crate::error::ZiporaError::NotSupported { .. }),
        "CriticalBit insert must return NotSupported, got: {err}",
    );
    assert!(!trie.contains(b"hello"));
}

#[test]
fn test_implemented_strategies_still_work() {
    // DoubleArray (default)
    let mut da: ZiporaTrie = ZiporaTrie::new();
    da.insert(b"hello").unwrap();
    assert!(da.contains(b"hello"));

    // Patricia
    let mut pat: ZiporaTrie = ZiporaTrie::with_config(ZiporaTrieConfig::cache_optimized());
    pat.insert(b"hello").unwrap();
    assert!(pat.contains(b"hello"));
}

#[test]
fn test_double_array_insert_contains() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    // Default is now DoubleArray
    trie.insert(b"hello").unwrap();
    assert_eq!(trie.len(), 1);
    assert!(trie.contains(b"hello"));
    assert!(!trie.contains(b"world"));

    trie.insert(b"world").unwrap();
    assert_eq!(trie.len(), 2);
    assert!(trie.contains(b"hello"));
    assert!(trie.contains(b"world"));

    trie.insert(b"help").unwrap();
    assert_eq!(trie.len(), 3);
    assert!(trie.contains(b"help"));
    assert!(trie.contains(b"hello"));

    // Duplicate insert should not increase len
    trie.insert(b"hello").unwrap();
    assert_eq!(trie.len(), 3);
}

#[test]
fn test_double_array_keys() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    trie.insert(b"apple").unwrap();
    trie.insert(b"app").unwrap();
    trie.insert(b"banana").unwrap();

    let mut keys = trie.keys();
    keys.sort();
    assert_eq!(keys.len(), 3);
    assert_eq!(keys[0], b"app");
    assert_eq!(keys[1], b"apple");
    assert_eq!(keys[2], b"banana");
}

#[test]
fn test_double_array_prefix_with_empty_key() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    trie.insert(b"").unwrap();
    trie.insert(b"a").unwrap();
    trie.insert(b"ab").unwrap();
    trie.insert(b"abc").unwrap();
    trie.insert(b"abd").unwrap();
    trie.insert(b"b").unwrap();

    let all = trie.keys_with_prefix(b"");
    assert_eq!(
        all.len(),
        6,
        "keys_with_prefix('') should return all 6 keys"
    );
}

#[test]
fn test_double_array_empty_key() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    trie.insert(b"").unwrap();
    trie.insert(b"a").unwrap();
    trie.insert(b"ab").unwrap();

    assert_eq!(trie.len(), 3);
    assert!(trie.contains(b""));
    assert!(trie.contains(b"a"));
    assert!(trie.contains(b"ab"));

    let mut keys = trie.keys();
    keys.sort();
    assert_eq!(keys.len(), 3, "Should have 3 keys including empty");
    assert_eq!(keys[0], b"");
    assert_eq!(keys[1], b"a");
    assert_eq!(keys[2], b"ab");
}

// --- Coverage tests for each improvement ---

/// Issue #1: Lazy stats — verify stats() works correctly after inserts
#[test]
fn test_lazy_stats() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    for i in 0..100 {
        trie.insert(format!("key{:03}", i).as_bytes()).unwrap();
    }
    assert_eq!(trie.len(), 100);
    let stats = trie.stats();
    assert_eq!(stats.num_keys, 100);
    assert!(stats.memory_usage > 0);
    assert!(stats.num_states > 0);
}

/// Issue #2: No double traversal — duplicate insert does not increase len
#[test]
fn test_no_double_traversal_duplicate() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    trie.insert(b"abc").unwrap();
    trie.insert(b"abc").unwrap();
    trie.insert(b"abc").unwrap();
    assert_eq!(trie.len(), 1);

    trie.insert(b"def").unwrap();
    trie.insert(b"def").unwrap();
    assert_eq!(trie.len(), 2);
}

/// Issue #3: Compact PatriciaNode — Patricia still works with compact children
#[test]
fn test_patricia_compact_node() {
    let config = ZiporaTrieConfig {
        trie_strategy: crate::fsa::TrieStrategy::Patricia {
            max_path_length: 64,
            compression_threshold: 4,
            adaptive_compression: true,
        },
        ..ZiporaTrieConfig::default()
    };
    let mut trie: ZiporaTrie = ZiporaTrie::with_config(config);
    trie.insert(b"hello").unwrap();
    trie.insert(b"help").unwrap();
    trie.insert(b"world").unwrap();

    assert_eq!(trie.len(), 3);
    assert!(trie.contains(b"hello"));
    assert!(trie.contains(b"help"));
    assert!(trie.contains(b"world"));
    assert!(!trie.contains(b"hel"));
}

/// Issue #4/#5: find_free_base + relocate — many inserts don't panic
#[test]
fn test_find_free_base_many_inserts() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    // Insert many keys to stress find_free_base and relocation
    for i in 0..500 {
        trie.insert(format!("key_{:04}", i).as_bytes()).unwrap();
    }
    assert_eq!(trie.len(), 500);
    // Verify random lookups
    assert!(trie.contains(b"key_0000"));
    assert!(trie.contains(b"key_0250"));
    assert!(trie.contains(b"key_0499"));
    assert!(!trie.contains(b"key_0500"));
}

/// Issue #6: Amortized growth — large insert doesn't OOM or take forever
#[test]
fn test_amortized_growth() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    // 1000 inserts should complete quickly with 1.5x growth
    for i in 0..1000 {
        trie.insert(format!("{:04}", i).as_bytes()).unwrap();
    }
    assert_eq!(trie.len(), 1000);
}

/// Issue #8: TrieMap — key-value storage
#[test]
fn test_trie_map() {
    let mut map = ZiporaTrieMap::<u32, RankSelectInterleaved256>::new();
    map.insert(b"hello", 42).unwrap();
    map.insert(b"world", 100).unwrap();
    map.insert(b"help", 7).unwrap();

    assert_eq!(map.get(b"hello"), Some(42));
    assert_eq!(map.get(b"world"), Some(100));
    assert_eq!(map.get(b"help"), Some(7));
    assert_eq!(map.get(b"missing"), None);
    assert_eq!(map.len(), 3);

    // Update existing key
    let prev = map.insert(b"hello", 99).unwrap();
    assert_eq!(prev, Some(42));
    assert_eq!(map.get(b"hello"), Some(99));
    assert_eq!(map.len(), 3); // len unchanged
}

/// Issue #9: Bulk construction
#[test]
fn test_build_from_sorted() {
    let keys: Vec<&[u8]> = vec![b"apple", b"application", b"apply", b"banana", b"band"];
    let trie: ZiporaTrie =
        ZiporaTrie::build_from_sorted(&keys, ZiporaTrieConfig::default()).unwrap();

    assert_eq!(trie.len(), 5);
    assert!(trie.contains(b"apple"));
    assert!(trie.contains(b"application"));
    assert!(trie.contains(b"apply"));
    assert!(trie.contains(b"banana"));
    assert!(trie.contains(b"band"));
    assert!(!trie.contains(b"ban"));
}

/// Issue #10: Default is DoubleArray
#[test]
fn test_default_is_double_array() {
    let config = ZiporaTrieConfig::default();
    assert!(matches!(
        config.trie_strategy,
        crate::fsa::TrieStrategy::DoubleArray { .. }
    ));
}

/// DoubleArray remove support
#[test]
fn test_double_array_remove() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    trie.insert(b"hello").unwrap();
    trie.insert(b"world").unwrap();
    assert_eq!(trie.len(), 2);

    assert!(trie.remove(b"hello").unwrap());
    assert_eq!(trie.len(), 1);
    assert!(!trie.contains(b"hello"));
    assert!(trie.contains(b"world"));

    // Remove non-existent key
    assert!(!trie.remove(b"missing").unwrap());
    assert_eq!(trie.len(), 1);
}

/// DoubleArray lookup_node_id + restore_string roundtrip
#[test]
fn test_double_array_node_id_roundtrip() {
    let mut trie: ZiporaTrie = ZiporaTrie::new();
    trie.insert(b"hello").unwrap();
    trie.insert(b"world").unwrap();

    let node_id = trie.lookup_node_id(b"hello").expect("should find hello");
    let restored = trie.restore_string(node_id).expect("should restore");
    assert_eq!(restored, b"hello");

    let node_id2 = trie.lookup_node_id(b"world").expect("should find world");
    let restored2 = trie.restore_string(node_id2).expect("should restore");
    assert_eq!(restored2, b"world");

    assert!(trie.lookup_node_id(b"missing").is_none());
}