"""
RGD-PHYSICS :: FLUID MODEL
Dynamics for Swarms and Data Streams.
Enforces Laminar Flow logic (Reynolds Number for Causality).
"""
from ..core.interfaces import DynamicsModel, Microsecond
from ..chronon.interfaces import ChrononProtocol
from ..core.exceptions import CausalityBreak

class FluidModel(DynamicsModel):
    """
    Treats the entity as a particle within a Fluid Stream.
    Prevents 'Turbulence' (Chaotic movement relative to the flow).
    """
    
    def validate_movement(self, t0: ChrononProtocol, t1: ChrononProtocol, dt: Microsecond) -> None:
        # 1. CALCULATE VELOCITY
        # Simplified linear velocity
        # (Real implementation would calculate vector field divergence)
        dist = 1.0 # Placeholder for metric distance
        velocity = dist / dt if dt > 0 else 0.0
        
        # 2. DETERMINE VISCOSITY (From Laws Encoded)
        # High scale index = High Viscosity (Thick Time / Strong Constraints)
        delta_raw = t0.laws_encoded
        viscosity_idx = (delta_raw >> 29) & 0b111
        viscosity = 0.001 * (10 ** viscosity_idx) # 0.001 to 10.0
        
        # 3. CALCULATE REYNOLDS NUMBER (Re)
        # Re = (Velocity * Characteristic Length) / Viscosity
        reynolds_number = velocity / viscosity
        
        # 4. CHECK TURBULENCE
        CRITICAL_REYNOLDS = 2000.0
        
        if reynolds_number > CRITICAL_REYNOLDS:
            raise CausalityBreak(
                f"TURBULENCE DETECTED: Re {reynolds_number:.1f} > {CRITICAL_REYNOLDS}. "
                "Swarm coherence lost."
            )