// Shared utility functions for WhatsApp nodes

/**
 * Format a phone number for WhatsApp Web client (chat)
 * Assumes the recipient is a chat (@c.us)
 */
async function formatChatNumber(numb, waClient, nodeLogger) {
    // Validate input
    if (!numb) {
        throw new Error('Number is required');
    }
    
    // Convert to string if number
    numb = typeof numb === 'number' ? numb.toString() : numb;
    
    // If already formatted, return as-is
    if (numb.includes('@')) {
        return numb;
    }
    
    // Clean: remove everything except digits
    numb = numb.replace(/\D/g, '');
    
    // Validate cleaned number
    if (!numb || numb.length === 0) {
        throw new Error('Invalid number format');
    }
    
    // Validate with getNumberId
    try {
        const numbID = await waClient.getNumberId(numb);
        if (numbID) {
            return `${numbID.user}@${numbID.server}`;
        } else {
            // If validation fails, assume it's a chat
            nodeLogger.warn(`getNumberId returned null for ${numb}, using @c.us`);
            return `${numb}@c.us`;
        }
    } catch (e) {
        // If error, assume it's a chat
        nodeLogger.warn(`getNumberId failed for ${numb}, using @c.us: ${e.message}`);
        return `${numb}@c.us`;
    }
}

/**
 * Format a group ID for WhatsApp Web client
 * Assumes the recipient is a group (@g.us)
 */
async function formatGroupId(gID, waClient, nodeLogger) {
    // Validate input
    if (!gID) {
        throw new Error('Group ID is required');
    }
    
    // Convert to string if number
    gID = typeof gID === 'number' ? gID.toString() : gID;
    
    // If already formatted, return as-is
    if (gID.includes('@')) {
        return gID;
    }
    
    // Clean: preserve hyphens (group format: NUMBER-TIMESTAMP)
    gID = gID.replace(/[^\d-]/g, '');
    
    // Validate cleaned group ID
    if (!gID || gID.length === 0) {
        throw new Error('Invalid group ID format');
    }
    
    // Groups always use @g.us
    return `${gID}@g.us`;
}

/**
 * Format a phone number for Socket client (chat)
 * Assumes the recipient is a chat
 */
async function formatChatNumberSocket(numb, waClient, nodeLogger) {
    // Handle message object with remoteJid
    if (numb && numb.remoteJid) {
        return numb.remoteJid;
    }
    
    // Validate input
    if (!numb) {
        throw new Error('Number is required');
    }
    
    // Convert to string if number
    numb = typeof numb === 'number' ? numb.toString() : numb;
    
    // If already formatted, return as-is
    if (numb.includes('@')) {
        return numb;
    }
    
    // Clean: remove everything except digits
    numb = numb.replace(/\D/g, '');
    
    // Validate cleaned number
    if (!numb || numb.length === 0) {
        throw new Error('Invalid number format');
    }
    
    // Check if number exists on WhatsApp
    try {
        const client = await waClient;
        const [result] = await client.onWhatsApp(numb);
        if (result?.exists) {
            return result.jid;
        }
        // If not found, assume chat
        nodeLogger.warn(`onWhatsApp returned no results for ${numb}, using @s.whatsapp.net`);
        return `${numb}@s.whatsapp.net`;
    } catch (e) {
        nodeLogger.warn(`onWhatsApp failed for ${numb}, using @s.whatsapp.net: ${e.message}`);
        return `${numb}@s.whatsapp.net`;
    }
}

/**
 * Format a group ID for Socket client
 * Assumes the recipient is a group (@g.us)
 */
async function formatGroupIdSocket(gID, waClient, nodeLogger) {
    // Handle message object with remoteJid
    if (gID && gID.remoteJid) {
        return gID.remoteJid;
    }
    
    // Validate input
    if (!gID) {
        throw new Error('Group ID is required');
    }
    
    // Convert to string if number
    gID = typeof gID === 'number' ? gID.toString() : gID;
    
    // If already formatted, return as-is
    if (gID.includes('@')) {
        return gID;
    }
    
    // Clean: preserve hyphens (group format: NUMBER-TIMESTAMP)
    gID = gID.replace(/[^\d-]/g, '');
    
    // Validate cleaned group ID
    if (!gID || gID.length === 0) {
        throw new Error('Invalid group ID format');
    }
    
    // Groups always use @g.us
    return `${gID}@g.us`;
}

module.exports = {
    formatChatNumber,
    formatGroupId,
    formatChatNumberSocket,
    formatGroupIdSocket
};