architecture.puml

@startuml Architecture
class Extension {
    + activate()
    + deactivate()
    - _onCreateDocument()
    - _onSaveDocument()
    - _excuteCommand()
}

Extension --> FileheaderManager

FileheaderManager --> FeatureProviderLoader

FeatureProviderLoader o-- IFileheaderLanguageProvider

class FileheaderManager {
    - _providers: Array<IFileheaderLanguageProvider>
    - _loadProviders(): Promise<void>
    - _isSupportedLanguage(languageId: string): boolean
    - _hasExistingFileheader(): boolean
    + updateFileheader(document: TextDocument): Promise<void>
}
FileheaderManager -- FileheaderVariableBuilder
FileheaderManager -- ExtensionConfigManager
class FeatureProviderLoader {
    + load(): Array<IFileheaderLanguageProvider>
    - _loadCustomProviders(): Array<IFileheaderLanguageProvider>
}

abstract class IFileheaderLanguageProvider {
    + languages: Array<string>
    + {abstract} getTemplate(tpl: ITemplateFunction, variables: IFileheaderVariables): Tuple<Array<string>, Array<string>>
    + getFileheader(variables: IFileheaderVariables): string
}

IFileheaderLanguageProvider --> FileheaderVariableBuilder
IFileheaderLanguageProvider -> ITemplateFunction

class TypescriptProvider implements IFileheaderLanguageProvider {
}

class PythonProvider implements IFileheaderLanguageProvider {
}


interface IFileheaderVariables {
    + ctime: Date
    + mtime: Date
    + author: string
    + authorEmail: string
    + dateFormant?: string
}

interface ITemplateFunction {
    + (strings: Array<string>, interpolations: Array<any>): Tuple<Array<string>, Array<string>>
}

class FileheaderVariableBuilder {
    + {static} build(config: vscode.WorkspaceConfiguration): FileheaderVariables
}

class ExtensionConfigManager {
    get(): vscode.WorkspaceConfiguration
    set(): Promise<void>
}

IFileheaderLanguageProvider --> IFileheaderVariables

class Utils {
    {static} hasShebang(document: TextDocument): boolean
    {static} getTaggedTemplateInputs(strings: Array<string>, ...inteplations: Array<any>): Tuple<Array<string>, Array<any>>
}

FileheaderVariableBuilder --> CanNotGetAuthorError
FileheaderVariableBuilder --> CanNotGetEmailError
FileheaderVariableBuilder --> ExtensionConfigManager

class Error {}

class GetAuthorError extends Error {}
class GetEmailError extends Error {}
@enduml