import bpy
import mathutils

def calculate_global_bounds(selected_objects):
    if not selected_objects:
        print("No objects selected.")
        return None

    min_x = float('inf')
    min_y = float('inf')
    min_z = float('inf')
    max_x = float('-inf')
    max_y = float('-inf')
    max_z = float('-inf')

    for obj in selected_objects:
        if obj.type != 'MESH':
            continue
        
        # Transform local bounding box corners to world space
        matrix = obj.matrix_all_world = obj.matrix_world
        for corner in obj.bound_box:
            world_corner = matrix @ mathutils.Vector(corner)
            
            min_x = min(min_x, world_corner.x)
            min_y = min(min_y, world_corner.y)
            min_z = min(min_z, world_corner.z)
            max_x = max(max_x, world_corner.x)
            max_y = max(max_y, world_corner.y)
            max_z = max(max_z, world_corner.z)

    if min_x == float('inf'):
        print("No valid mesh objects found in selection.")
        return None

    return {
        'min': (min_x, min_y, min_z),
        'max': (max_x, max_y, max_z),
        'dimensions': (max_x - min_x, max_y - min_y, max_z - min_z),
        'target_origin': (max_x, min_y, min_z)
    }

if __name__ == "__main__":
    print("Phase 1: Logic verification script loaded.")