// Cognitive Stack Tests for MimirsWell
// Based on whitepaper_v2.md 7-layer cognitive architecture
//
// The architecture evolves from memory retrieval to autonomous cognitive entity:
// | Current State -> Target State |
// | Memory Store -> Autonomous Cognitive Substrate |
// | Retrieval-Augmented Agent -> Self-Reflective Entity |
// | Static Recall -> Dynamic Internal Simulation |
// | Episodic Memory -> Persistent Identity Continuity |
// | Prompt-Driven -> Goal-Driven |
// | Tool Calling -> Autonomous Strategic Planning |

use mimirs_core::MemoryId;
use mimirs_density::DensityMemory;
use mimirs_otoc::Vafthrudnir;
use mimirs_reservoir::QrcReservoir;

// =============================================================================
// L1: Urdarbrunnr - Immutable Substrate Storage
// Tests: Memory stability, persistence, immutability guarantees
// =============================================================================

#[test]
fn test_l1_uradarbrunnr_immutable_storage() {
    // Test that density matrix memory is stable and persistent
    let mem = DensityMemory::from_pure(&[1.0, 0.5, 0.5, 1.0]).unwrap();

    // Memory should be stable after creation
    let _ = mem.purity();

    // Mix with maximally mixed state (decoherence simulation)
    let mixed = mem
        .mix(
            &DensityMemory::from_pure(&[0.0, 1.0, 0.0, 0.0]).unwrap(),
            0.5,
        )
        .unwrap();

    // Purity should degrade gracefully, not crash
    assert!(mixed.purity() < 1.0);
    assert!(mixed.purity() >= 0.0);
}

// =============================================================================
// L2: Minni - Semantic Recall and Vector Topology
// Tests: HNSW approximate nearest neighbor search, semantic similarity
// =============================================================================

#[test]
fn test_l2_minni_semantic_topology() {
    // Test that density matrices can be compared semantically
    let mem1 = DensityMemory::from_pure(&[1.0, 0.0, 0.0]).unwrap();
    let mem2 = DensityMemory::from_pure(&[0.99, 0.01, 0.0]).unwrap(); // Similar
    let mem3 = DensityMemory::from_pure(&[0.0, 1.0, 0.0]).unwrap(); // Orthogonal

    // Similar states should have higher measurement correlation
    let _sim1 = mem1.measure(&[1.0, 0.0, 0.0]).unwrap().expected;
    let sim2 = mem2.measure(&[1.0, 0.0, 0.0]).unwrap().expected;
    let sim3 = mem3.measure(&[1.0, 0.0, 0.0]).unwrap().expected;

    // mem2 is more similar to mem1 than mem3
    assert!(sim2 > sim3);
}

// =============================================================================
// L3: Muninn - Symbolic Abstraction + Reasoning Compression
// Tests: Memory abstraction, symbolic reasoning capabilities
// =============================================================================

#[test]
fn test_l3_muninn_abstraction_compression() {
    // Test that mixed states represent abstracted knowledge
    let concept1 = DensityMemory::from_pure(&[1.0, 0.0]).unwrap();
    let concept2 = DensityMemory::from_pure(&[0.0, 1.0]).unwrap();

    // Create abstraction through mixing
    let abstract_concept = concept1.mix(&concept2, 0.5).unwrap();

    // Abstract concept should have reduced purity (uncertainty)
    assert!(abstract_concept.purity() < 1.0);

    // But should still retain information
    assert!(abstract_concept.purity() > 0.0);
}

// =============================================================================
// L4: Hugin - Temporal Episodic Simulation
// Tests: Reservoir temporal dynamics, episodic memory simulation
// =============================================================================

#[test]
fn test_l4_hugin_temporal_simulation() {
    // Test that reservoir maintains temporal dynamics for episodic simulation
    let mut reservoir = QrcReservoir::new(100, 10).unwrap();

    // Simulate episodic input sequence
    let episodes: Vec<Vec<f32>> = (0..20)
        .map(|i| vec![if i % 2 == 0 { 1.0 } else { 0.0 }; 10])
        .collect();

    // Process multiple timesteps
    for input in episodes {
        reservoir.step(&input).unwrap();
    }

    // States should evolve over time (temporal dynamics)
    assert!(reservoir.state().len() == 100);
}

// =============================================================================
// L5: Forseti - Verifiability + Contradiction Arbitration
// Tests: OTOC scrambling scores, contradiction detection, safety checks
// =============================================================================

#[test]
fn test_l5_forseti_verifiability_arbitration() {
    // Test that OTOC oracle prevents unsafe memory operations
    let mut oracle = Vafthrudnir::new();
    let id = MemoryId::new();

    // Simulate high scrambling
    oracle
        .record_gradient(&id.to_string(), &vec![1.0; 512])
        .unwrap();

    let score = oracle.scrambling_score(&id.to_string(), 0);
    assert!(score.value() >= 0.0);
}
