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 #!/usr/bin/env python
 """Example demonstrating BaseOptimizer and AxOptimizer integration with DTLZ2.
 
 This script shows how to:
 1. Load optimizer configuration from JSON file
 2. Define a search space using the new BaseOptimizer interface
 3. Create an AxOptimizer instance
 4. Run multi-objective optimization on DTLZ2 benchmark
 5. Serialize and deserialize optimizer state
 
 DTLZ2 is a multi-objective test problem with a known Pareto front.
 For 2 objectives and M variables, the optimal solutions lie on the unit sphere.
 
 Project: AID2E v0.0.0 - AI assisted Detector Design for EIC
 Homepage: https://aid2e.github.io/aid2e-framework
 Repository: https://github.com/aid2e/AID2E-framework.git
 """
 
 import os
 import json
 import numpy as np
 from pathlib import Path
 from aid2e.optimizers import BaseOptimizer, SearchSpace, AxOptimizer, AxOptimizerConfig
 from aid2e.utilities.configurations import OptimizerConfiguration
 
 
 def dtlz2(x_dict, n_objectives=2):
     """DTLZ2 multi-objective test problem.
     
     Args:
         x_dict: Dictionary of parameters (x1, x2, ..., x10)
         n_objectives: Number of objectives (default: 2)
     
     Returns:
         Dictionary with objective values {f1, f2, ...}
     
     Notes:
         For 2 objectives, the Pareto front lies on the unit circle.
         Optimal solutions have g(x) = 0, where g is the sum of squared
         deviations from 0.5 for decision variables after the first M-1.
     """
     # Convert dict to array
     x = np.array([x_dict[f'x{i+1}'] for i in range(len(x_dict))])
     k = len(x) - n_objectives + 1
     
     # g function (auxiliary function)
     g = np.sum((x[n_objectives-1:] - 0.5) ** 2)
     
     # Compute objectives
     objectives = {}
     for i in range(n_objectives):
         f = 1.0 + g
         for j in range(n_objectives - i - 1):
             f *= np.cos(x[j] * np.pi / 2.0)
         if i > 0:
             f *= np.sin(x[n_objectives - i - 1] * np.pi / 2.0)
         objectives[f'f{i+1}'] = f
     
     return objectives
 
 
 def main():
     print("=" * 70)
     print("AID2E BaseOptimizer + AxOptimizer: DTLZ2 Example")
     print("=" * 70)
     
     # 1. Load configuration from JSON file
     print("\n1. Loading configuration from JSON file...")
     config_path = Path(__file__).with_name("dtlz2_ax_python_api.json")
     with open(config_path, 'r') as f:
         config_data = json.load(f)
     
     print(f"   Config file: {config_path.name}")
     print(f"   Problem: {config_data['name']}")
     
     # 2. Parse configuration using OptimizerConfiguration
     print("\n2. Parsing optimization configuration...")
     optimizer_payload = config_data.get("optimizer", config_data)
     opt_config = OptimizerConfiguration(**optimizer_payload)
     objective_names = config_data.get("objectives", [])
     n_iterations = config_data.get("n_iterations", 30)
     
     print(f"   Optimizer: {opt_config.name}")
     print(f"   Strategy: {opt_config.parameters.get('initialization_strategy', 'sobol')}")
     print(f"   Generator: {opt_config.parameters.get('generator', 'BOTORCH_MODULAR')}")
     
     # 3. Create AxOptimizerConfig from parsed parameters
     print("\n3. Creating AxOptimizerConfig...")
     optimizer_params = opt_config.parameters
     ax_config = AxOptimizerConfig(
         initialization_strategy=optimizer_params.get('initialization_strategy', 'sobol'),
         generator=optimizer_params.get('generator', 'BOTORCH_MODULAR'),
         generator_kwargs=optimizer_params.get('generator_kwargs', {}),
         generator_gen_kwargs=optimizer_params.get('generator_gen_kwargs', {}),
         objective_thresholds=optimizer_params.get('objective_thresholds'),
         n_initial_samples=optimizer_params.get('n_initial_samples', 10),
         n_iterations=n_iterations,
         batch_size=optimizer_params.get('batch_size', 3),
         seed=optimizer_params.get('seed', 42)
     )
     print(f"   Initial samples: {ax_config.n_initial_samples}")
     print(f"   Total iterations: {ax_config.n_iterations}")
     print(f"   Batch size: {ax_config.batch_size}")
     
     # 4. Define search space from configuration parameters
     print("\n4. Defining search space from configuration...")
     search_space_params = {}
     parameters = config_data.get('parameters', {})
     for param_name, param_config in parameters.items():
         search_space_params[param_name] = {
             "type": "range",
             "value": 0.5,
             "bounds": param_config["bounds"]
         }
     
     search_space = SearchSpace(parameters=search_space_params)
     print(f"   Parameters: {list(search_space.parameters.keys())}")
     print(f"   Total dimensions: {len(search_space.parameters)}")
     
     # 5. Create AxOptimizer instance
     print("\n5. Creating AxOptimizer...")
     optimizer = AxOptimizer(
         search_space=search_space,
         config=ax_config,
         objective_names=objective_names,
         seed=ax_config.seed
     )
     print(f"   Optimizer: {optimizer}")
     print(f"   Objectives: {objective_names}")
     print(f"   Inherits from BaseOptimizer: {isinstance(optimizer, BaseOptimizer)}")
     
     # 6. Run multi-objective optimization loop
     print("\n6. Running multi-objective optimization on DTLZ2...")
     n_iterations = 5
     
     for iteration in range(n_iterations):
         print(f"\n   Iteration {iteration + 1}/{n_iterations}:")
         
         # Suggest candidates
         candidates = optimizer.suggest_candidates(n_candidates=ax_config.batch_size)
         print(f"   - Suggested {len(candidates)} candidates")
         
         # Get current trial count before adding results
         trial_start_idx = len(optimizer.experiment.trials) - len(candidates)
         
         # Evaluate candidates using DTLZ2
         for idx, candidate in enumerate(candidates):
             # Evaluate DTLZ2
             objectives = dtlz2(candidate, n_objectives=len(objective_names))
             
             # Update optimizer with results
             trial_idx = trial_start_idx + idx
             optimizer.update_with_results(
                 trial_index=trial_idx,
                 parameters=candidate,
                 metrics=objectives
             )
             
             # Display results
             x_vals = [f"{candidate[f'x{i+1}']:.3f}" for i in range(3)]  # Show first 3
             obj_vals = [f"{objectives[obj]:.4f}" for obj in objective_names]
             print(f"     Trial {trial_idx}: x=[{', '.join(x_vals)}, ...] → {dict(zip(objective_names, obj_vals))}")
     
     # 7. Get Pareto front
     print("\n7. Retrieving Pareto front...")
     pareto_front = optimizer.get_pareto_front()
     print(f"   Pareto front size: {len(pareto_front)}")
     
     if pareto_front:
         print("\n   Pareto-optimal solutions:")
         for i, trial in enumerate(pareto_front[:5]):  # Show first 5
             obj_vals = [f"{trial.metrics[obj]:.4f}" for obj in objective_names]
             print(f"     Solution {i+1}: {dict(zip(objective_names, obj_vals))}")
         
         if len(pareto_front) > 5:
             print(f"     ... and {len(pareto_front) - 5} more solutions")
     
     # 8. Get best trial (representative from Pareto front)
     print("\n8. Best trial (from Pareto front):")
     best_trial = optimizer.get_best_trial()
     if best_trial:
         print(f"   Objectives: {best_trial.metrics}")
         print(f"   (For DTLZ2, optimal Pareto front is on unit sphere)")
     
     # 9. Get all trials
     print(f"\n9. Total trials evaluated: {len(optimizer.get_trials())}")
     
     # 10. Serialize and deserialize state
     print("\n10. Testing state serialization...")
     state = optimizer.serialize_state()
     print(f"    Serialized state has {len(state['trials'])} trials")
     
     # Create new optimizer and load state
     optimizer2 = AxOptimizer(
         search_space=search_space,
         config=ax_config,
         objective_names=objective_names,
         seed=ax_config.seed
     )
     optimizer2.load_state(state)
     print(f"    Loaded state: {len(optimizer2.get_trials())} trials restored")
     
     pareto_front2 = optimizer2.get_pareto_front()
     print(f"    Pareto front after reload: {len(pareto_front2)} solutions")
     
     print("\n" + "=" * 70)
     print("DTLZ2 multi-objective optimization completed successfully!")
     print("=" * 70)
 
 
 if __name__ == "__main__":
     main()

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