Utility Functions

class ModelUtils {
    // Schema type checking
    public static boolean isObjectSchema(Schema schema);
    public static boolean isComposedSchema(Schema schema);    // oneOf/anyOf/allOf schemas
    public static boolean isMapSchema(Schema schema);
    public static boolean isArraySchema(Schema schema);
    public static boolean isStringSchema(Schema schema);
    public static boolean isIntegerSchema(Schema schema);
    public static boolean isNumberSchema(Schema schema);
    public static boolean isBooleanSchema(Schema schema);
    public static boolean isNullType(Schema schema);
    public static boolean isAnyType(Schema schema);
    
    // Format-specific schema checking
    public static boolean isDateSchema(Schema schema);        // date format strings
    public static boolean isDateTimeSchema(Schema schema);    // date-time format strings
    public static boolean isByteArraySchema(Schema schema);   // byte format strings
    public static boolean isBinarySchema(Schema schema);      // binary format strings
    public static boolean isFileSchema(Schema schema);        // file upload schemas
    public static boolean isUUIDSchema(Schema schema);        // uuid format strings
    public static boolean isEmailSchema(Schema schema);       // email format strings
    public static boolean isPasswordSchema(Schema schema);    // password format strings
    
    // Schema analysis and discovery
    public static List<String> getAllUsedSchemas(OpenAPI openAPI);     // Find all referenced schemas
    public static List<String> getUnusedSchemas(OpenAPI openAPI);      // Find unreferenced schemas
    public static String getSimpleRef(String ref);                     // Extract name from $ref URL
    public static Schema unaliasSchema(Schema schema, OpenAPI openAPI); // Resolve schema aliases/references
    
    // Model processing utilities
    public static CodegenModel getModelByName(final String name, final Map<String, ModelsMap> models);
    public static boolean isGenerateAliasAsModel();           // Check alias-as-model setting
    public static void setGenerateAliasAsModel(boolean value); // Configure alias-as-model behavior
}

class StringUtils {
    // Case transformation
    public static String camelize(String word);               // Convert to camelCase
    public static String camelize(String word, CamelizeOption camelizeOption); // With options
    public static String underscore(String word);             // Convert to snake_case
    public static String dashize(String word);               // Convert to dash-case
    
    // Text escaping and sanitization
    public static String escape(String input, Map<String, String> mapping, 
                               Set<String> charactersToAllow, Set<String> charactersToEscape);
}

enum CamelizeOption {
    LOWERCASE_FIRST_LETTER,    // Start with lowercase letter
    UPPERCASE_FIRST_LETTER     // Start with uppercase letter (PascalCase)
}

class SemVer implements Comparable<SemVer> {
    // Constructors
    public SemVer(String version);                // Parse version string (e.g., "1.2.3-alpha+build")
    
    // Version component access
    public int getMajor();                        // Get major version number
    public int getMinor();                        // Get minor version number
    public int getPatch();                        // Get patch version number
    public String getPrerelease();                // Get prerelease identifier (alpha, beta, etc.)
    public String getBuild();                     // Get build metadata
    
    // Comparison methods
    public int compareTo(SemVer other);           // Standard comparison (-1, 0, 1)
    public boolean isGreaterThan(SemVer other);   // Check if this > other
    public boolean isLessThan(SemVer other);      // Check if this < other
    public boolean isEquivalentTo(SemVer other);  // Check if versions are equivalent
    
    // String representation
    public String getVersion();                   // Get normalized version string
    public String toString();                     // String representation
}

public class SchemaProcessor {
    
    public void processOpenAPIDocument(OpenAPI openAPI) {
        // Find all schemas referenced in the document
        List<String> usedSchemas = ModelUtils.getAllUsedSchemas(openAPI);
        System.out.println("Referenced schemas: " + usedSchemas.size());
        
        // Identify unused schemas for cleanup
        List<String> unusedSchemas = ModelUtils.getUnusedSchemas(openAPI);
        if (!unusedSchemas.isEmpty()) {
            System.out.println("Unused schemas that could be removed: " + unusedSchemas);
        }
        
        // Process each schema in components
        Map<String, Schema> schemas = openAPI.getComponents().getSchemas();
        for (Map.Entry<String, Schema> entry : schemas.entrySet()) {
            String schemaName = entry.getKey();
            Schema schema = entry.getValue();
            
            processSchema(schemaName, schema, openAPI);
        }
    }
    
    private void processSchema(String name, Schema schema, OpenAPI openAPI) {
        // Resolve any aliases or references
        Schema resolvedSchema = ModelUtils.unaliasSchema(schema, openAPI);
        
        if (ModelUtils.isObjectSchema(resolvedSchema)) {
            processObjectSchema(name, resolvedSchema);
        } else if (ModelUtils.isArraySchema(resolvedSchema)) {
            processArraySchema(name, resolvedSchema);
        } else if (ModelUtils.isStringSchema(resolvedSchema)) {
            processStringSchema(name, resolvedSchema);
        } else if (ModelUtils.isNumberSchema(resolvedSchema) || ModelUtils.isIntegerSchema(resolvedSchema)) {
            processNumericSchema(name, resolvedSchema);
        } else if (ModelUtils.isComposedSchema(resolvedSchema)) {
            processComposedSchema(name, resolvedSchema);
        }
    }
    
    private void processStringSchema(String name, Schema schema) {
        if (ModelUtils.isDateSchema(schema)) {
            System.out.println(name + " is a date field");
        } else if (ModelUtils.isDateTimeSchema(schema)) {
            System.out.println(name + " is a date-time field");
        } else if (ModelUtils.isEmailSchema(schema)) {
            System.out.println(name + " is an email field");
        } else if (ModelUtils.isUUIDSchema(schema)) {
            System.out.println(name + " is a UUID field");
        } else if (ModelUtils.isBinarySchema(schema)) {
            System.out.println(name + " is binary data");
        }
    }
}

public class NamingProcessor {
    
    public void demonstrateStringTransformations() {
        String input = "user_account_details";
        
        // Convert to different naming conventions
        String camelCase = StringUtils.camelize(input);
        // Result: "userAccountDetails"
        
        String pascalCase = StringUtils.camelize(input, CamelizeOption.UPPERCASE_FIRST_LETTER);
        // Result: "UserAccountDetails"
        
        String dashCase = StringUtils.dashize(camelCase);
        // Result: "user-account-details"
        
        String snakeCase = StringUtils.underscore(pascalCase);
        // Result: "user_account_details"
        
        System.out.println("Original: " + input);
        System.out.println("camelCase: " + camelCase);
        System.out.println("PascalCase: " + pascalCase);
        System.out.println("dash-case: " + dashCase);
        System.out.println("snake_case: " + snakeCase);
    }
    
    public String generateMethodName(String operationId) {
        // Clean and transform operation ID to method name
        String cleaned = operationId.replaceAll("[^a-zA-Z0-9_]", "_");
        return StringUtils.camelize(cleaned, CamelizeOption.LOWERCASE_FIRST_LETTER);
    }
    
    public String generateClassName(String schemaName) {
        // Transform schema name to class name
        String cleaned = schemaName.replaceAll("[^a-zA-Z0-9_]", "_");
        return StringUtils.camelize(cleaned, CamelizeOption.UPPERCASE_FIRST_LETTER);
    }
    
    public String sanitizeText(String input) {
        // Create custom escaping rules
        Map<String, String> escapeMapping = new HashMap<>();
        escapeMapping.put("\"", "\\\"");
        escapeMapping.put("\n", "\\n");
        escapeMapping.put("\t", "\\t");
        
        Set<String> allowedChars = Set.of("a-z", "A-Z", "0-9", " ", "_", "-");
        Set<String> escapeChars = Set.of("\"", "\n", "\t", "\\");
        
        return StringUtils.escape(input, escapeMapping, allowedChars, escapeChars);
    }
}

public class VersionManager {
    
    public void compareVersions() {
        SemVer current = new SemVer("2.1.0");
        SemVer minimum = new SemVer("2.0.0");
        SemVer target = new SemVer("2.2.0-beta");
        SemVer latest = new SemVer("3.0.0");
        
        // Basic comparisons
        if (current.isGreaterThan(minimum)) {
            System.out.println("Current version meets minimum requirement");
        }
        
        if (current.isLessThan(target)) {
            System.out.println("Upgrade available to " + target.getVersion());
        }
        
        // Version component access
        System.out.println("Current version components:");
        System.out.println("  Major: " + current.getMajor());
        System.out.println("  Minor: " + current.getMinor());
        System.out.println("  Patch: " + current.getPatch());
        
        if (target.getPrerelease() != null) {
            System.out.println("Target is prerelease: " + target.getPrerelease());
        }
        
        // Sorting versions
        List<SemVer> versions = Arrays.asList(latest, current, minimum, target);
        Collections.sort(versions);
        
        System.out.println("Versions in ascending order:");
        for (SemVer version : versions) {
            System.out.println("  " + version.toString());
        }
    }
    
    public boolean isCompatibleVersion(String requiredVersion, String actualVersion) {
        SemVer required = new SemVer(requiredVersion);
        SemVer actual = new SemVer(actualVersion);
        
        // Check if major versions match and actual is >= required
        return actual.getMajor() == required.getMajor() && 
               actual.isGreaterThan(required) || actual.isEquivalentTo(required);
    }
    
    public SemVer findLatestCompatibleVersion(List<String> availableVersions, String minimumVersion) {
        SemVer minimum = new SemVer(minimumVersion);
        
        return availableVersions.stream()
            .map(SemVer::new)
            .filter(version -> version.getMajor() == minimum.getMajor()) // Same major version
            .filter(version -> version.isGreaterThan(minimum) || version.isEquivalentTo(minimum))
            .max(SemVer::compareTo)
            .orElse(null);
    }
}

public class ModelProcessor {
    
    public void processGeneratedModels(Map<String, ModelsMap> allModels) {
        for (Map.Entry<String, ModelsMap> entry : allModels.entrySet()) {
            String packageName = entry.getKey();
            ModelsMap modelsMap = entry.getValue();
            
            System.out.println("Processing package: " + packageName);
            
            for (ModelMap modelMap : modelsMap.getModels()) {
                CodegenModel model = (CodegenModel) modelMap.get("model");
                processModel(model);
            }
        }
    }
    
    private void processModel(CodegenModel model) {
        System.out.println("Processing model: " + model.classname);
        
        // Find model by name in all models (utility method)
        // CodegenModel foundModel = ModelUtils.getModelByName(model.name, allModels);
        
        // Process model properties
        for (CodegenProperty property : model.vars) {
            processProperty(property, model);
        }
        
        // Handle inheritance
        if (model.parent != null) {
            System.out.println("  Extends: " + model.parent);
        }
        
        if (model.interfaces != null && !model.interfaces.isEmpty()) {
            System.out.println("  Implements: " + String.join(", ", model.interfaces));
        }
    }
    
    private void processProperty(CodegenProperty property, CodegenModel parentModel) {
        // Apply naming conventions
        String getterName = "get" + StringUtils.camelize(property.name, CamelizeOption.UPPERCASE_FIRST_LETTER);
        String setterName = "set" + StringUtils.camelize(property.name, CamelizeOption.UPPERCASE_FIRST_LETTER);
        
        property.getter = getterName;
        property.setter = setterName;
        
        // Add custom vendor extensions
        property.vendorExtensions.put("x-custom-getter", getterName);
        property.vendorExtensions.put("x-custom-setter", setterName);
        property.vendorExtensions.put("x-parent-model", parentModel.classname);
        
        System.out.println("    Property: " + property.name + " (" + property.dataType + ")");
    }
}

public class ReferenceResolver {
    
    public void resolveSchemaReferences(OpenAPI openAPI) {
        Map<String, Schema> schemas = openAPI.getComponents().getSchemas();
        
        for (Map.Entry<String, Schema> entry : schemas.entrySet()) {
            String schemaName = entry.getKey();
            Schema schema = entry.getValue();
            
            resolveSchemaRefs(schemaName, schema, openAPI);
        }
    }
    
    private void resolveSchemaRefs(String name, Schema schema, OpenAPI openAPI) {
        if (schema.get$ref() != null) {
            // Extract reference name
            String refName = ModelUtils.getSimpleRef(schema.get$ref());
            System.out.println("Schema " + name + " references: " + refName);
            
            // Resolve the reference
            Schema resolvedSchema = ModelUtils.unaliasSchema(schema, openAPI);
            
            if (resolvedSchema != schema) {
                System.out.println("  Resolved to actual schema");
                processResolvedSchema(name, resolvedSchema, openAPI);
            }
        }
        
        // Process properties that might contain references
        if (schema.getProperties() != null) {
            for (Map.Entry<String, Schema> propEntry : schema.getProperties().entrySet()) {
                String propName = propEntry.getKey();
                Schema propSchema = propEntry.getValue();
                
                if (propSchema.get$ref() != null) {
                    String propRefName = ModelUtils.getSimpleRef(propSchema.get$ref());
                    System.out.println("  Property " + propName + " references: " + propRefName);
                }
            }
        }
    }
    
    private void processResolvedSchema(String name, Schema schema, OpenAPI openAPI) {
        // Process the resolved schema
        if (ModelUtils.isObjectSchema(schema)) {
            System.out.println("    Resolved to object schema");
        } else if (ModelUtils.isArraySchema(schema)) {
            System.out.println("    Resolved to array schema");
        }
        // ... other processing
    }
}