trigger LeadDeduplicate on Lead (after insert) {

    List<Account> accounts = [SELECT ID, Account_ID__c, Siret__c, OwnerId FROM Account WHERE Account_ID__c != NULL AND CreatedDate > :System.Today() - 30];
    List<Contact> contacts = [SELECT ID, Email, MobilePhone, AccountId, OwnerId FROM Contact WHERE CreatedDate > :System.Today() - 30];
    Boolean leadIsConverted = false;

    for(Lead lead : trigger.new) {
        // Trigger only if the lead comes from external
        if(lead.IsExternal__c) {
            for(Account account : accounts) {
                if(!leadIsConverted) {
                    if(Utils.hasTheSameAccountId(lead, account) || Utils.hasTheSameSiret(lead, account)) {
                        Utils.mergeLeadWithAccount(lead, account);
                        leadIsConverted = true;
                    }
                }
            }

            if(!leadIsConverted && !contacts.isEmpty()) {
                for(Contact contact : contacts) {
                    if(!leadIsConverted) {
                        if(Utils.hasTheSameEmail(lead, contact) || Utils.hasTheSameMobile(lead, contact)) {
                            Utils.mergeLeadWithContact(lead, contact);
                            leadIsConverted = true;
                        }
                    }
                }
            }
        }
        leadIsConverted = false;
    }
}