#!/bin/bash

# Internal Initialization

source "${DIP_FUNCTIONS}"

if [[ -r "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_NAME}.conf" ]]; then
    source "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_NAME}.conf"
fi

if [[ -r "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_EXEC}.conf" ]]; then
    source "${DIP_BASE_DIR}/conf.d/${DIP_AGENT_EXEC}.conf"
fi

if [[ -z "$DIP_CUR_IP" ]] || [[ -z "$DIP_OLD_IP" ]] || [[ -z "$DIP_RECORD" ]]; then
    logerr "ERROR: Agent expects currentip, existingip, and record."
    exit 98
fi

# Get Host and Domain Name

_get_host_and_domain() {
    local record=$1

    hostname=${record%%.*}
    domain=${record#*.}

    if [[ -n "${agent_update_dns_namecheap_token[$domain]}" ]]; then
        token="${agent_update_dns_namecheap_token[$domain]}"
        return 0
    else
        logerr "ERROR: Password for $domain not found in agent configuration."
        return 1
    fi
}

# Update and Check Response

_update_dns_namecheap() {
    local dnsHostname=$1
    local dnsDomain=$2
    local dnsToken=$3
    local dnsIP=$4
    local result
    local errors

    result="$(curl -qs \"https://dynamicdns.park-your-domain.com/update?host=${dnsHostname}&domain=${dnsDomain}&password=${dnsToken}&ip=${dnsIP}" | grep ErrCount)"
    if [[ $? -eq 0 ]]; then
        errors="$(grep -oPm1 "(?<=<ErrCount>)[^<]+" <<< $result)"

        if [[ "$errors" -eq 0 ]]; then
            echo "DNS record ${dnsHostname}.${dnsDomain} updated successfully."
            return 0
        else
            echo "DNS record ${dnsHostname}.${dnsDomain} failed to update."
            return 96
        fi
    else
        echo "Failed to update DNS Record"
        return 95
    fi
}

# Main

_get_host_and_domain "$DIP_RECORD" || return 99

if valid_ipv4 "$DIP_CUR_IP"; then
    log "Updating Namecheap DNS IPv4 Record for ${hostname}.${domain}"
    _update_dns_namecheap "$hostname" "$domain" "$token" "${DIP_CUR_IP}"
    return $?
fi

if valid_ipv6 "$DIP_CUR_IP"; then
    log "Updating Namecheap DNS IPv6 Record for ${hostname}.${domain}"
    _update_dns_namecheap "$hostname" "$domain" "$token" "${DIP_CUR_IP}"
    return $?
fi