package windows.prefs;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class IniFile {

private Pattern _section = Pattern.compile( "\s\[([^]])\]\s" );
private Pattern _keyValue = Pattern.compile( "\s([^=])=(.)" );
private Map< String,
Map< String,
String >> _entries = new HashMap<>();

public IniFile( String path ) throws IOException {
load( path );
}

public void load( String path ) throws IOException {
try( BufferedReader br = new BufferedReader( new FileReader( path ))) {
String line;
String section = null;
while(( line = br.readLine()) != null ) {
Matcher m = _section.matcher( line );
if( m.matches()) {
section = m.group( 1 ).trim();
}
else if( section != null ) {
m = _keyValue.matcher( line );
if( m.matches()) {
String key = m.group( 1 ).trim();
String value = m.group( 2 ).trim();
Map< String, String > kv = _entries.get( section );
if( kv == null ) {
_entries.put( section, kv = new HashMap<>());
}
kv.put( key, value );
}
}
}
}
}

public String getString( String section, String key, String defaultvalue ) {
Map< String, String > kv = _entries.get( section );
if( kv == null ) {
return defaultvalue;
}
return kv.get( key );
}

public int getInt( String section, String key, int defaultvalue ) {
Map< String, String > kv = _entries.get( section );
if( kv == null ) {
return defaultvalue;
}
return Integer.parseInt( kv.get( key ));
}

public float getFloat( String section, String key, float defaultvalue ) {
Map< String, String > kv = _entries.get( section );
if( kv == null ) {
return defaultvalue;
}
return Float.parseFloat( kv.get( key ));
}

public double getDouble( String section, String key, double defaultvalue ) {
Map< String, String > kv = _entries.get( section );
if( kv == null ) {
return defaultvalue;
}
return Double.parseDouble( kv.get( key ));
}
}