window.Utils = {
    $(selector, parent) {
        return (parent || document).querySelector(selector);
    },

    $$(selector, parent) {
        return (parent || document).querySelectorAll(selector);
    },

    formatConfidence(value) {
        return (value * 100).toFixed(0) + '%';
    },

    confidenceLevel(value) {
        if (value >= 0.8) return 'high';
        if (value >= 0.5) return 'medium';
        return 'low';
    },

    formatTimestamp(ts) {
        var d = new Date(ts);
        return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' });
    },

    formatDate(ts) {
        var d = new Date(ts);
        return d.toLocaleDateString() + ' ' + d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
    },

    generateId() {
        return Date.now().toString(36) + Math.random().toString(36).slice(2);
    },

    formatFileSize(bytes) {
        if (bytes < 1024) return bytes + ' B';
        if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' KB';
        return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
    },

    validateFile(file) {
        var ALLOWED = ['image/png', 'image/jpeg', 'image/bmp', 'image/webp'];
        var MAX_SIZE = 10 * 1024 * 1024;
        if (!ALLOWED.includes(file.type)) {
            return { valid: false, error: 'Invalid file type: ' + file.name };
        }
        if (file.size > MAX_SIZE) {
            return { valid: false, error: 'File too large: ' + file.name + ' (' + this.formatFileSize(file.size) + ')' };
        }
        return { valid: true };
    },

    showToast(message, type, duration) {
        type = type || 'info';
        duration = duration || 4000;
        var container = this.$('#toast-container');
        var toast = document.createElement('div');
        toast.className = 'toast ' + type;
        toast.textContent = message;
        container.appendChild(toast);
        setTimeout(function () {
            toast.style.opacity = '0';
            toast.style.transition = 'opacity 0.3s';
            setTimeout(function () { toast.remove(); }, 300);
        }, duration);
    },

    fieldLabel(key) {
        var labels = {
            id_number: 'ID Number',
            surname: 'Surname',
            names: 'Names',
            given_names: 'Given Names',
            date_of_birth: 'Date of Birth',
            sex: 'Sex',
            nationality: 'Nationality',
            country_of_birth: 'Country of Birth',
            citizenship_status: 'Citizenship',
            passport_number: 'Passport Number',
            expiry_date: 'Expiry Date',
            issuing_country: 'Issuing Country',
        };
        return labels[key] || key.replace(/_/g, ' ').replace(/\b\w/g, function (c) { return c.toUpperCase(); });
    },

    checkLabel(key) {
        var labels = {
            image_quality: 'Image Quality',
            id_number_valid: 'ID Number Valid',
            mrz_valid: 'MRZ Valid',
            barcode_valid: 'Barcode Valid',
            data_crosscheck: 'Data Cross-check',
            dob_crosscheck: 'DOB Cross-check',
            gender_crosscheck: 'Gender Cross-check',
        };
        return labels[key] || key.replace(/_/g, ' ').replace(/\b\w/g, function (c) { return c.toUpperCase(); });
    },

    docTypeLabel(docType) {
        var labels = {
            sa_id_card: 'SA Smart Card',
            sa_id_book: 'SA Green Book',
            passport: 'Passport',
            product_serial: 'Product Serial',
        };
        return labels[docType] || docType;
    },

    fieldsForDocType(docType) {
        if (docType === 'passport') {
            return ['passport_number', 'surname', 'given_names', 'date_of_birth', 'sex', 'nationality', 'expiry_date', 'issuing_country', 'id_number'];
        }
        return ['id_number', 'surname', 'names', 'date_of_birth', 'sex', 'nationality', 'country_of_birth', 'citizenship_status'];
    },
};