"""
Simplified test script that works without MODFLOW executable.
This demonstrates the GSPy interface contract without requiring MODFLOW to run.
"""

import numpy as np

def run_modflow_step(*args):
    """
    Simplified GSPy-compliant function that simulates MODFLOW behavior
    without actually running MODFLOW. Useful for testing GSPy interface.
    """
    try:
        # Extract recharge flux from GSPy arguments
        Daily_Seepage_Flux_LpT = args[0]
        
        print(f"Simulated MODFLOW step with recharge: {Daily_Seepage_Flux_LpT} m/day")
        
        # Simple empirical relationship to simulate groundwater discharge
        # Based on: higher recharge -> higher groundwater levels -> more discharge
        
        # Base discharge from initial conditions (groundwater mound above river)
        base_discharge = 0.125  # m³/s baseflow
        
        # Additional discharge from recharge (simplified relationship)
        # Assume 20×20 cells × 50m spacing = 1000m × 1000m = 1,000,000 m² area
        area_m2 = 20 * 20 * 50 * 50  # 1,000,000 m²
        
        # Convert recharge flux to volume rate
        recharge_volume_rate = Daily_Seepage_Flux_LpT * area_m2 / 86400  # m³/s
        
        # Simple assumption: 30% of recharge becomes return flow
        # (rest goes to storage, evaporation, or flows out boundaries)
        recharge_contribution = recharge_volume_rate * 0.3
        
        # Total return flow
        total_return_flow = base_discharge + recharge_contribution
        
        print(f"  Base discharge: {base_discharge:.6f} m³/s")
        print(f"  Recharge contribution: {recharge_contribution:.6f} m³/s") 
        print(f"  Total return flow: {total_return_flow:.6f} m³/s")
        
        # Return GSPy-compliant tuple
        return (total_return_flow,)
        
    except Exception as e:
        print(f"Error in simulated run_modflow_step: {e}")
        return (0.0,)


def process_data(*args):
    """Alternative GSPy entry point."""
    return run_modflow_step(*args)


if __name__ == "__main__":
    print("Testing Simplified GSPy Interface (No MODFLOW Required)")
    print("=" * 60)
    
    # Test values to reach ~0.452 m³/s target
    # Base discharge = 0.125 m³/s
    # Need additional 0.327 m³/s from recharge
    # 0.327 / 0.3 = 1.09 m³/s needed from recharge
    # 1.09 * 86400 / 1000000 = 0.094 m/day needed
    
    test_recharge = [0.0, 0.020, 0.050, 0.094, 0.120]  # m/day
    
    print(f"Target return flow: ~0.452 m³/s")
    print("Testing recharge values to find target discharge...")
    
    for i, recharge in enumerate(test_recharge):
        print(f"\n--- Time Step {i+1} ---")
        result_tuple = run_modflow_step(recharge)
        return_flow = result_tuple[0]
        
        if abs(return_flow - 0.452) < 0.05:
            print(f"*** CLOSE TO TARGET! Recharge {recharge} m/day gives {return_flow:.3f} m³/s ***")
    
    print(f"\nSimplified GSPy interface test completed!")
    print(f"Use recharge ≈ 0.094 m/day to get ≈ 0.452 m³/s return flow")