package owrt

import "fmt"

// UCIDHCPConf describes uci dhcp server configuration for an network inteface (uci show dhcp)
type UCIDHCPConf struct {
	Name       string
	IFName     string
	LeaseTime  string
	RangeLimit string
	StartIP    string
	UciClient  *UCI
}

// NewUCIDHCPConf builds a new UCIDHCPConf instance
func NewUCIDHCPConf(uci *UCI) *UCIDHCPConf {
	return &UCIDHCPConf{
		UciClient: uci,
	}
}

// Create add a new entry for wifi interface in UCI Configuration
func (dh *UCIDHCPConf) Create() *Action {
	uci := dh.UciClient
	conf := make(map[string]string)

	conf["name"] = dh.Name
	conf["interface"] = dh.IFName
	conf["leasetime"] = dh.LeaseTime
	conf["limit"] = dh.RangeLimit
	conf["ra_management"] = "1"
	conf["start"] = dh.StartIP

	result := uci.Set(fmt.Sprintf("dhcp.%s", dh.Name), "dhcp")
	if result.ReturnCode != 0 {
		return result
	}
	for key, value := range conf {
		if value == "" {
			return &Action{
				CommandResult: &CommandResult{
					Stdout:     "",
					Stderr:     fmt.Sprintf("dhcp.%s can't be empty", key),
					ReturnCode: 100,
				},
				Command: "Empty value error",
			}
		}
		result := uci.Set(fmt.Sprintf("dhcp.%s.%s", dh.Name, key), value)
		if result.ReturnCode != 0 {
			return result
		}
	}

	return &Action{
		CommandResult: &CommandResult{
			Stdout:     "",
			Stderr:     "",
			ReturnCode: 0,
		},
	}
}

// Save commit and relaod configuration (writes it to files !)
func (dh *UCIDHCPConf) Save() *Action {
	uci := dh.UciClient
	commitRes := uci.Commit()
	if commitRes.ReturnCode != 0 {
		return commitRes
	}

	reload := uci.Reload()
	return reload
}

// Delete remove wifi interface from UCI Configuration
func (dh *UCIDHCPConf) Delete() *Action {
	uci := dh.UciClient
	toDelete := fmt.Sprintf("network.%s", dh.Name)
	del := uci.Delete(toDelete)
	if del.ReturnCode != 0 {
		return del
	}
	return uci.Commit()
}

// Update add a new entry for wifi interface in UCI Configuration
func (dh *UCIDHCPConf) Update() *Action {
	uci := dh.UciClient
	dh.Delete()
	create := dh.Create()
	if create.ReturnCode != 0 {
		return create
	}
	return uci.Commit()
}