apps/whatsapp-worker/src/services/utils.ts

export function levenshteinDistance(a: string, b: string): number {
    const matrix: number[][] = [];
    for (let i = 0; i <= b.length; i++) matrix[i] = [i];
    for (let j = 0; j <= a.length; j++) matrix[0][j] = j;

    for (let i = 1; i <= b.length; i++) {
        for (let j = 1; j <= a.length; j++) {
            if (b.charAt(i - 1) === a.charAt(j - 1)) {
                matrix[i][j] = matrix[i - 1][j - 1];
            } else {
                matrix[i][j] = Math.min(
                    matrix[i - 1][j - 1] + 1,
                    matrix[i][j - 1] + 1,
                    matrix[i - 1][j] + 1
                );
            }
        }
    }
    return matrix[b.length][a.length];
}

export function isFuzzyMatch(text: string, target: string, threshold = 0.8): boolean {
    const normalized = text.trim().toUpperCase();
    const tar = target.toUpperCase();
    if (normalized === tar) return true;
    if (normalized.includes(tar) || tar.includes(normalized)) return true;

    const distance = levenshteinDistance(normalized, tar);
    const maxLength = Math.max(normalized.length, tar.length);
    const similarity = 1 - distance / maxLength;
    return similarity >= threshold;
}