package memento;

/**
 * Originator — the text editor whose state we're saving and restoring.
 * Creates mementos and restores from them; no history management here.
 */
public class Editor {
    private String content       = "";
    private int    cursorPosition = 0;
    private String selectedText  = "";

    public void type(String text) {
        content = content.substring(0, cursorPosition) + text + content.substring(cursorPosition);
        cursorPosition += text.length();
    }

    public void selectText(int start, int end) {
        this.selectedText = content.substring(start, end);
        System.out.println("  Selected: \"" + selectedText + "\"");
    }

    public void deleteSelection() {
        content = content.replace(selectedText, "");
        selectedText = "";
    }

    /** Create a snapshot of current state */
    public EditorMemento save() {
        return new EditorMemento(content, cursorPosition, selectedText);
    }

    /** Restore state from a snapshot */
    public void restore(EditorMemento memento) {
        this.content        = memento.getContent();
        this.cursorPosition = memento.getCursorPosition();
        this.selectedText   = memento.getSelectedText();
    }

    @Override
    public String toString() {
        return "Editor[\"" + content + "\", cursor=" + cursorPosition + "]";
    }
}