/*!
 * Finnish (Suomi) language functions
 * @author Santhosh Thottingal
 */

mw.language.convertGrammarMapping.fi = function ( word, form ) {
	// vowel harmony flag
	let aou = /[aou][^äöy]*$/i.test( word );
	const origWord = word;
	if ( /wiki$/i.test( word ) ) {
		aou = false;
	}
	// append i after final consonant
	if ( /[bcdfghjklmnpqrstvwxz]$/i.test( word ) ) {
		word += 'i';
	}

	switch ( form ) {
		case 'genitive':
			word += 'n';
			break;
		case 'elative':
			word += ( aou ? 'sta' : 'stä' );
			break;
		case 'partitive':
			word += ( aou ? 'a' : 'ä' );
			break;
		case 'illative':
			// Double the last letter and add 'n'
			word += word.slice( -1 ) + 'n';
			break;
		case 'inessive':
			word += ( aou ? 'ssa' : 'ssä' );
			break;
		default:
			word = origWord;
			break;
	}
	return word;
};