// NII Surface Driver - Native TSM Bytecode Implementation
// TSM-ISA v2.9 Genetic Bytecode
// Calls the NII Core Surface Driver with SSS monitoring, warp metric, FAMM scheduling, and topological adaptation
//
// Architecture:
//   - TSM-ISA v2.9 Opcodes: Native hardware instruction mapping
//   - SSS (Steady-State Stability) monitoring from Layer 6
//   - Alcubierre warp metric from Layer 7
//   - FAMM-aware scheduling
//   - Topological state management with N-local adaptation
//   - Q16.16 fixed-point arithmetic
//
// Expected Performance:
//   - SSS computation: < 10μs
//   - Warp metric: < 15μs
//   - FAMM scheduling: < 5μs
//   - Total driver overhead: < 50μs

module NIISurfaceDriver {

  // ========================================================================
  // CONSTANTS & CONFIGURATION
  // ========================================================================

  const Q16_16_ONE: u32 = 0x00010000;        // 1.0 in Q16.16
  const Q16_16_ZERO: u32 = 0x00000000;       // 0.0 in Q16.16
  const Q16_16_HALF: u32 = 0x00008000;       // 0.5 in Q16.16
  const Q16_16_QUARTER: u32 = 0x00004000;    // 0.25 in Q16.16

  // TSM-ISA v2.9 Opcode Definitions (from substrate_isa_spec.md)
  enum TSM_Opcode: u8 {
    INGEST_FLOW = 0x01,          // Absorb data into manifold
    FOLD_SPACE = 0x02,           // Einstein-Rosen fold
    SYNC_CLOCK = 0x03,           // System clock synchronization
    OMNI_BAL = 0x04,             // Balance all registers
    ENTANGLE = 0x05,             // Quantum entanglement
    EVOLVE = 0x06,               // Evolution step
    VRAM_FLUSH = 0x07,           // Clear GPU memory (MODE_SURVIVAL)
    STARK_PROVE = 0x08,          // Generate ZK-STARK proof
    LEDGER_COMMIT = 0x09,        // Commit to HyperDAG ledger
    SOLITONIFY = 0x0E,           // Set Soliton State to "Frozen"
    GPGPU_SURF = 0x0F,           // Launch GPGPU kernel
    RESONATE = 0x14,             // Compute Hamming distance / frequency match
    NII_SURFACE = 0x20,          // NII Surface Driver intrinsic (custom)
  }

  // ========================================================================
  // DATA STRUCTURES
  // ========================================================================

  struct SSSConstant {
    routing_load: u32;           // L_R: routing load (counter-torque)
    memory_load: u32;            // L_M: memory load (counter-torque)
    extraneous_weight: u32;      // λ_E: extraneous load weight
    engram_length: u32;          // ℓ: characteristic engram neighborhood length
    extraneous_gradient: u32;    // ‖∇L_E‖: gradient magnitude
  }

  struct SlipCondition {
    sss_constant: u32;
    heel_dig_limit: u32;         // σ_sys: slip threshold
  }

  struct WarpFunction {
    kappa: u32;                  // Steepness parameter
    sss_constant: u32;
    opcode_efficacy: u32;        // Ω_opcode
  }

  struct EffectiveVelocity {
    local_velocity: u32;
    coherence: u32;              // φ: phase coherence angle
  }

  struct FAMMTiming {
    torsional_stress: u32;       // Σ²
    interlocking_energy: u32;    // I_lock
    laplacian_energy: u32;       // Δϕ
  }

  struct TopologicalState {
    cognitive_load: u32;
    topology_metric: string;     // "relational", "semantic", "topological", "minimal"
    coherence: u32;
  }

  struct NIISurfaceDriverState {
    core_id: u32;
    sss_constant: SSSConstant;
    slip_condition: SlipCondition;
    warp_function: WarpFunction;
    famm_timing: FAMMTiming;
    topological_state: TopologicalState;
    current_status: u8;
  }

  // ========================================================================
  // TSM-ISA HARDWARE INTRINSICS
  // ========================================================================

  // [0x01] INGEST_FLOW - Absorb data into manifold
  intrinsic tsm_ingest_flow(data: array<u8>) -> string;

  // [0x03] SYNC_CLOCK - System clock synchronization
  intrinsic tsm_sync_clock() -> f64;

  // [0x07] VRAM_FLUSH - Clear GPU memory (MODE_SURVIVAL trigger)
  intrinsic tsm_vram_flush() -> bool;

  // [0x0E] SOLITONIFY - Set Soliton State to "Frozen"
  intrinsic tsm_solitonify(state: any) -> bool;

  // [0x14] RESONATE - Compute Hamming distance / frequency match
  intrinsic tsm_resonate(a: u128, b: u128) -> u32;

  // [0x20] NII_SURFACE - NII Surface Driver intrinsic (custom)
  intrinsic tsm_nii_surface(state: NIISurfaceDriverState) -> NIISurfaceDriverState;

  // ========================================================================
  // Q16.16 FIXED-POINT ARITHMETIC
  // ========================================================================

  kernel Q16_16_Arithmetic {

    fn q16_16_add(a: u32, b: u32) -> u32 {
      return a + b;
    }

    fn q16_16_sub(a: u32, b: u32) -> u32 {
      return a - b;
    }

    fn q16_16_mul(a: u32, b: u32) -> u32 {
      // Q16.16 multiplication: (a * b) >> 16
      let product = (a as u64) * (b as u64);
      return (product >> 16) as u32;
    }

    fn q16_16_div(a: u32, b: u32) -> u32 {
      // Q16.16 division: (a << 16) / b
      let numerator = (a as u64) << 16;
      return (numerator / (b as u64)) as u32;
    }

    fn q16_16_compare(a: u32, b: u32) -> i32 {
      if a < b { return -1; }
      if a > b { return 1; }
      return 0;
    }
  }

  // ========================================================================
  // SSS MONITOR - LAYER 6
  // ========================================================================

  kernel SSSMonitor {

    fn compute_sss(c: SSSConstant) -> u32 {
      // Φ_sss = (L_R + L_M) - λ_E · ℓ · ‖∇L_E‖
      let counter_torque = Q16_16_Arithmetic::q16_16_add(c.routing_load, c.memory_load);
      let torsional_term = Q16_16_Arithmetic::q16_16_mul(
        Q16_16_Arithmetic::q16_16_mul(c.extraneous_weight, c.engram_length),
        c.extraneous_gradient
      );
      return Q16_16_Arithmetic::q16_16_sub(counter_torque, torsional_term);
    }

    fn is_slip_threshold_crossed(c: SlipCondition) -> bool {
      // Φ_sss < -σ_sys
      let negative_heel_dig = Q16_16_Arithmetic::q16_16_sub(Q16_16_ZERO, c.heel_dig_limit);
      return Q16_16_Arithmetic::q16_16_compare(c.sss_constant, negative_heel_dig) < 0;
    }
  }

  // ========================================================================
  // WARP METRIC - LAYER 7
  // ========================================================================

  kernel WarpMetric {

    // Simplified sigmoid approximation for Q16.16
    fn sigmoid_q16_16(x: u32) -> u32 {
      // Piecewise linear approximation
      let neg_5 = Q16_16_Arithmetic::q16_16_mul(Q16_16_FROM_FLOAT(-5.0), Q16_16_ONE);
      let pos_5 = Q16_16_Arithmetic::q16_16_mul(Q16_16_FROM_FLOAT(5.0), Q16_16_ONE);
      
      if Q16_16_Arithmetic::q16_16_compare(x, neg_5) < 0 {
        return Q16_16_ZERO;
      }
      if Q16_16_Arithmetic::q16_16_compare(x, pos_5) > 0 {
        return Q16_16_ONE;
      }
      
      let x_plus_5 = Q16_16_Arithmetic::q16_16_add(x, pos_5);
      let ten = Q16_16_Arithmetic::q16_16_mul(Q16_16_FROM_FLOAT(10.0), Q16_16_ONE);
      return Q16_16_Arithmetic::q16_16_div(x_plus_5, ten);
    }

    fn compute_warp(w: WarpFunction) -> u32 {
      // f(x_i) = sigmoid(-κ·Φ_sss) · Ω_opcode
      let exponent = Q16_16_Arithmetic::q16_16_mul(-w.kappa, w.sss_constant);
      let sigmoid = sigmoid_q16_16(exponent);
      return Q16_16_Arithmetic::q16_16_mul(sigmoid, w.opcode_efficacy);
    }

    fn compute_effective_velocity(v: EffectiveVelocity) -> u32 {
      // v_eff = v_local / (1 - φ)
      let denominator = Q16_16_Arithmetic::q16_16_sub(Q16_16_ONE, v.coherence);
      if Q16_16_Arithmetic::q16_16_compare(denominator, Q16_16_ZERO) <= 0 {
        return v.local_velocity;  // Avoid division by zero
      }
      return Q16_16_Arithmetic::q16_16_div(v.local_velocity, denominator);
    }
  }

  // ========================================================================
  // FAMM SCHEDULER
  // ========================================================================

  kernel FAMMScheduler {

    enum ScheduleDecision {
      EXECUTE = 0,
      DEFER = 1,
      THROTTLE = 2,
    }

    fn compute_famm_load(t: FAMMTiming) -> u32 {
      // L_famm = Σ² + I_lock + Δϕ
      let temp = Q16_16_Arithmetic::q16_16_add(t.torsional_stress, t.interlocking_energy);
      return Q16_16_Arithmetic::q16_16_add(temp, t.laplacian_energy);
    }

    fn make_schedule_decision(load: u32) -> ScheduleDecision {
      // Load < 0.25: Execute
      // Load < 0.5: Throttle
      // Load >= 0.5: Defer
      if Q16_16_Arithmetic::q16_16_compare(load, Q16_16_QUARTER) < 0 {
        return ScheduleDecision::EXECUTE;
      } else if Q16_16_Arithmetic::q16_16_compare(load, Q16_16_HALF) < 0 {
        return ScheduleDecision::THROTTLE;
      } else {
        return ScheduleDecision::DEFER;
      }
    }
  }

  // ========================================================================
  // TOPOLOGICAL ADAPTER
  // ========================================================================

  kernel TopologicalAdapter {

    fn adapt_topology(cognitive_load: u32) -> string {
      // Cognitive load < 0.25: Relational
      // Cognitive load < 0.5: Semantic
      // Cognitive load < 0.75: Topological
      // Cognitive load >= 0.75: Minimal
      if Q16_16_Arithmetic::q16_16_compare(cognitive_load, Q16_16_QUARTER) < 0 {
        return "relational";
      } else if Q16_16_Arithmetic::q16_16_compare(cognitive_load, Q16_16_HALF) < 0 {
        return "semantic";
      } else if Q16_16_Arithmetic::q16_16_compare(cognitive_load, Q16_16_FROM_FLOAT(0.75)) < 0 {
        return "topological";
      } else {
        return "minimal";
      }
    }
  }

  // ========================================================================
  // NII SURFACE DRIVER MAIN
  // ========================================================================

  kernel NIISurfaceDriverMain {

    fn init_nii_driver_state(core_id: u32) -> NIISurfaceDriverState {
      // Initialize SSS constant
      let sss_constant = SSSConstant {
        routing_load: Q16_16_FROM_FLOAT(1.0),
        memory_load: Q16_16_FROM_FLOAT(0.8),
        extraneous_weight: Q16_16_FROM_FLOAT(0.5),
        engram_length: Q16_16_FROM_FLOAT(4.0),
        extraneous_gradient: Q16_16_FROM_FLOAT(0.1)
      };

      // Initialize slip condition
      let sss_value = SSSMonitor::compute_sss(sss_constant);
      let slip_condition = SlipCondition {
        sss_constant: sss_value,
        heel_dig_limit: Q16_16_HALF
      };

      // Initialize warp function
      let warp_function = WarpFunction {
        kappa: Q16_16_ONE,
        sss_constant: sss_value,
        opcode_efficacy: Q16_16_ONE
      };

      // Initialize FAMM timing
      let famm_timing = FAMMTiming {
        torsional_stress: Q16_16_FROM_FLOAT(1.0),
        interlocking_energy: Q16_16_FROM_FLOAT(0.5),
        laplacian_energy: Q16_16_FROM_FLOAT(0.3)
      };

      // Initialize topological state
      let topological_state = TopologicalState {
        cognitive_load: Q16_16_ZERO,
        topology_metric: "relational",
        coherence: Q16_16_ONE
      };

      return NIISurfaceDriverState {
        core_id: core_id,
        sss_constant: sss_constant,
        slip_condition: slip_condition,
        warp_function: warp_function,
        famm_timing: famm_timing,
        topological_state: topological_state,
        current_status: 0  // IDLE
      };
    }

    fn execute_work_item(state: NIISurfaceDriverState, item: WorkItem) -> NIISurfaceDriverState {
      // Update SSS constant based on item parameters
      let new_sss_constant = SSSConstant {
        routing_load: item.kappa_squared,
        memory_load: item.kappa_hierarchy,
        extraneous_weight: state.sss_constant.extraneous_weight,
        engram_length: state.sss_constant.engram_length,
        extraneous_gradient: item.epsilon_mutation
      };

      let sss_value = SSSMonitor::compute_sss(new_sss_constant);

      // Check slip threshold
      let new_slip_condition = SlipCondition {
        sss_constant: sss_value,
        heel_dig_limit: state.slip_condition.heel_dig_limit
      };

      // Update FAMM timing
      let new_famm_timing = FAMMTiming {
        torsional_stress: item.kappa_squared,
        interlocking_energy: Q16_16_Arithmetic::q16_16_div(
          Q16_16_Arithmetic::q16_16_mul(item.kappa_hierarchy, item.kappa_hierarchy),
          Q16_16_Arithmetic::q16_16_add(Q16_16_ONE, item.kappa_hierarchy)
        ),
        laplacian_energy: item.epsilon_mutation
      };

      let famm_load = FAMMScheduler::compute_famm_load(new_famm_timing);
      let schedule_decision = FAMMScheduler::make_schedule_decision(famm_load);

      // Update topological state
      let new_topology_metric = TopologicalAdapter::adapt_topology(state.topological_state.cognitive_load);
      let new_topological_state = TopologicalState {
        cognitive_load: state.topological_state.cognitive_load,
        topology_metric: new_topology_metric,
        coherence: state.topological_state.coherence
      };

      // Update warp function
      let new_warp_function = WarpFunction {
        kappa: state.warp_function.kappa,
        sss_constant: sss_value,
        opcode_efficacy: state.warp_function.opcode_efficacy
      };

      // Update status based on slip condition and schedule decision
      let new_status = if SSSMonitor::is_slip_threshold_crossed(new_slip_condition) {
        // MODE_SURVIVAL trigger
        tsm_vram_flush();  // [0x07] VRAM_FLUSH
        3  // ERROR
      } else if schedule_decision == FAMMScheduler::ScheduleDecision::DEFER {
        0  // IDLE
      } else if schedule_decision == FAMMScheduler::ScheduleDecision::THROTTLE {
        1  // PROCESSING
      } else {
        2  // COMPLETE
      };

      return NIISurfaceDriverState {
        core_id: state.core_id,
        sss_constant: new_sss_constant,
        slip_condition: new_slip_condition,
        warp_function: new_warp_function,
        famm_timing: new_famm_timing,
        topological_state: new_topological_state,
        current_status: new_status
      };
    }
  }

  // ========================================================================
  // WORK ITEM STRUCTURE
  // ========================================================================

  struct WorkItem {
    id: u32;
    source_path: string;
    target_path: string;
    priority: u8;
    kappa_squared: u32;
    kappa_hierarchy: u32;
    epsilon_mutation: u32;
  }

  // ========================================================================
  // HELPER FUNCTIONS
  // ========================================================================

  fn Q16_16_FROM_FLOAT(f: f64) -> u32 {
    return (f * 65536.0) as u32;
  }

  // ========================================================================
  // PROGRAM ENTRYPOINT
  // ========================================================================

  fn main() {
    log::info("==============================================");
    log::info("  NII SURFACE DRIVER - TSM v2.9");
    log::info("  SSS Monitoring | Warp Metric | FAMM Scheduling");
    log::info("==============================================");

    // [0x03] SYNC_CLOCK - Initialize with cosmic clock
    let sync_time = tsm_sync_clock();
    log::info(string::format("System clock synchronized at {0} GHz", [sync_time / 1e9]));

    // Initialize NII surface driver state
    let state = NIISurfaceDriverMain::init_nii_driver_state(0);  // SEMANTIC core

    log::info(string::format("Initial SSS constant: {0}", [state.slip_condition.sss_constant]));
    log::info(string::format("Initial topology: {0}", [state.topological_state.topology_metric]));

    // Create test work item
    let item = WorkItem {
      id: 1,
      source_path: "core/gwl-vm/src/bytecode.rs",
      target_path: "Semantics/Substrate.lean",
      priority: 128,
      kappa_squared: Q16_16_FROM_FLOAT(1.0),
      kappa_hierarchy: Q16_16_FROM_FLOAT(0.3),
      epsilon_mutation: Q16_16_FROM_FLOAT(0.01)
    };

    // [0x01] INGEST_FLOW - Absorb work item into manifold
    let item_data = json::serialize(item);
    let manifold_id = tsm_ingest_flow(item_data);
    log::info(string::format("Work item ingested into manifold: {0}", [manifold_id]));

    // Execute work item
    let new_state = NIISurfaceDriverMain::execute_work_item(state, item);

    log::info(string::format("New SSS constant: {0}", [new_state.slip_condition.sss_constant]));
    log::info(string::format("New topology: {0}", [new_state.topological_state.topology_metric]));
    log::info(string::format("Status: {0}", [new_state.current_status]));

    // [0x0E] SOLITONIFY - Freeze the state
    let frozen = tsm_solitonify(new_state);
    log::info(string::format("State frozen: {0}", [frozen]));

    // [0x08] STARK_PROVE - Generate proof of execution
    let proof = tsm_stark_prove(new_state);
    log::info(string::format("Proof generated: {0}", [proof]));

    // [0x09] LEDGER_COMMIT - Commit to HyperDAG ledger
    let committed = tsm_ledger_commit(proof, "permanent");
    log::info(string::format("Committed to ledger: {0}", [committed]));

    log::info("NII Surface Driver execution complete");
  }

}

// ============================================================================
// SUPPORTING STRUCTS
// ============================================================================

struct WorkItem {
  id: u32;
  source_path: string;
  target_path: string;
  priority: u8;
  kappa_squared: u32;
  kappa_hierarchy: u32;
  epsilon_mutation: u32;
}