package generator

import (
	"fmt"

	configurator "github.com/OpenCHAMI/configurator/pkg"
	"github.com/OpenCHAMI/configurator/pkg/client"
	"github.com/OpenCHAMI/configurator/pkg/config"
	"github.com/OpenCHAMI/configurator/pkg/util"
)

type DNSMasq struct{}

func (g *DNSMasq) GetName() string {
	return "dnsmasq"
}

func (g *DNSMasq) GetVersion() string {
	return util.GitCommit()
}

func (g *DNSMasq) GetDescription() string {
	return fmt.Sprintf("Configurator generator plugin for '%s'.", g.GetName())
}

func (g *DNSMasq) Generate(config *config.Config, params Params) (FileMap, error) {
	// make sure we have a valid config first
	if config == nil {
		return nil, fmt.Errorf("invalid config (config is nil)")
	}

	// set all the defaults for variables
	var (
		smdClient       = client.NewSmdClient(params.ClientOpts...)
		eths            = []configurator.EthernetInterface{}
		err       error = nil
	)

	// if we have a client, try making the request for the ethernet interfaces
	eths, err = smdClient.FetchEthernetInterfaces(params.Verbose)
	if err != nil {
		return nil, fmt.Errorf("failed to fetch ethernet interfaces with client: %v", err)
	}

	// check if we have the required params first
	if eths == nil {
		return nil, fmt.Errorf("invalid ethernet interfaces (variable is nil)")
	}
	if len(eths) <= 0 {
		return nil, fmt.Errorf("no ethernet interfaces found")
	}

	// format output to write to config file
	output := "# ========== DYNAMICALLY GENERATED BY OPENCHAMI CONFIGURATOR ==========\n"
	for _, eth := range eths {
		if eth.Type == "NodeBMC" {
			output += "dhcp-host=" + eth.MacAddress + "," + eth.ComponentId + "," + eth.IpAddresses[0].IpAddress + "\n"
		} else {
			output += "dhcp-host=" + eth.MacAddress + "," + eth.ComponentId + "," + eth.IpAddresses[0].IpAddress + "\n"
		}
	}
	output += "# ====================================================================="

	// apply template substitutions and return output as byte array
	return ApplyTemplates(Mappings{
		"plugin_name":        g.GetName(),
		"plugin_version":     g.GetVersion(),
		"plugin_description": g.GetDescription(),
		"dhcp_hosts":         output,
	}, params.Templates)
}