// StartInstanceWithParams is a test helper function that starts an instance
// with the given parameters, and a plausible but invalid configuration, and
// returns the result of Environ.StartInstance. The provided params's
// InstanceConfig and Tools field values will be ignored.
func StartInstanceWithParams(
	env environs.Environ, machineId string,
	params environs.StartInstanceParams,
	networks []string,
) (
	*environs.StartInstanceResult, error,
) {
	preferredSeries := config.PreferredSeries(env.Config())
	agentVersion, ok := env.Config().AgentVersion()
	if !ok {
		return nil, errors.New("missing agent version in model config")
	}
	filter := coretools.Filter{
		Number: agentVersion,
		Series: preferredSeries,
	}
	if params.Constraints.Arch != nil {
		filter.Arch = *params.Constraints.Arch
	}
	stream := tools.PreferredStream(&agentVersion, env.Config().Development(), env.Config().AgentStream())
	possibleTools, err := tools.FindTools(env, -1, -1, stream, filter)
	if err != nil {
		return nil, errors.Trace(err)
	}

	if params.ImageMetadata == nil {
		if err := SetImageMetadata(
			env,
			possibleTools.AllSeries(),
			possibleTools.Arches(),
			&params.ImageMetadata,
		); err != nil {
			return nil, errors.Trace(err)
		}
	}

	machineNonce := "fake_nonce"
	stateInfo := FakeStateInfo(machineId)
	apiInfo := FakeAPIInfo(machineId)
	instanceConfig, err := instancecfg.NewInstanceConfig(
		machineId,
		machineNonce,
		imagemetadata.ReleasedStream,
		preferredSeries,
		"",
		true,
		networks,
		stateInfo,
		apiInfo,
	)
	if err != nil {
		return nil, errors.Trace(err)
	}
	eUUID, _ := env.Config().UUID()
	instanceConfig.Tags[tags.JujuModel] = eUUID
	params.Tools = possibleTools
	params.InstanceConfig = instanceConfig
	return env.StartInstance(params)
}

// findBootstrapTools returns a tools.List containing only those tools with
// which it would be reasonable to launch an environment's first machine,
// given the supplied constraints. If a specific agent version is not requested,
// all tools matching the current major.minor version are chosen.
func findBootstrapTools(env environs.Environ, vers *version.Number, arch *string) (list coretools.List, err error) {
	// Construct a tools filter.
	cliVersion := version.Current.Number
	var filter coretools.Filter
	if arch != nil {
		filter.Arch = *arch
	}
	if vers != nil {
		filter.Number = *vers
	}
	stream := envtools.PreferredStream(vers, env.Config().Development(), env.Config().AgentStream())
	return findTools(env, cliVersion.Major, cliVersion.Minor, stream, filter)
}

// findBootstrapTools returns a tools.List containing only those tools with
// which it would be reasonable to launch an environment's first machine,
// given the supplied constraints. If a specific agent version is not requested,
// all tools matching the current major.minor version are chosen.
func findBootstrapTools(env environs.Environ, vers *version.Number, arch *string) (list coretools.List, err error) {
	// Construct a tools filter.
	cliVersion := version.Current.Number
	var filter coretools.Filter
	if arch != nil {
		filter.Arch = *arch
	}
	if vers != nil {
		// If we already have an explicit agent version set, we're done.
		filter.Number = *vers
		return findTools(env, cliVersion.Major, cliVersion.Minor, filter)
	}
	return findTools(env, cliVersion.Major, cliVersion.Minor, filter)
}

// findBootstrapTools returns a tools.List containing only those tools with
// which it would be reasonable to launch an environment's first machine,
// given the supplied constraints. If a specific agent version is not requested,
// all tools matching the current major.minor version are chosen.
func findBootstrapTools(env environs.Environ, vers *version.Number, arch *string, dev bool) (list coretools.List, err error) {
	// Construct a tools filter.
	cliVersion := version.Current.Number
	var filter coretools.Filter
	if arch != nil {
		filter.Arch = *arch
	}
	if vers != nil {
		// If we already have an explicit agent version set, we're done.
		filter.Number = *vers
		return findTools(env, cliVersion.Major, cliVersion.Minor, filter, false)
	}
	if !dev {
		logger.Infof("filtering tools by released version")
		filter.Released = true
	}
	return findTools(env, cliVersion.Major, cliVersion.Minor, filter, false)
}

// StartInstanceWithParams is a test helper function that starts an instance
// with the given parameters, and a plausible but invalid configuration, and
// returns the result of Environ.StartInstance. The provided params's
// MachineConfig and Tools field values will be ignored.
func StartInstanceWithParams(
	env environs.Environ, machineId string,
	params environs.StartInstanceParams,
	networks []string,
) (
	instance.Instance, *instance.HardwareCharacteristics, []network.Info, error,
) {
	series := config.PreferredSeries(env.Config())
	agentVersion, ok := env.Config().AgentVersion()
	if !ok {
		return nil, nil, nil, fmt.Errorf("missing agent version in environment config")
	}
	filter := coretools.Filter{
		Number: agentVersion,
		Series: series,
	}
	if params.Constraints.Arch != nil {
		filter.Arch = *params.Constraints.Arch
	}
	possibleTools, err := tools.FindTools(
		env, -1, -1, filter, tools.DoNotAllowRetry,
	)
	if err != nil {
		return nil, nil, nil, err
	}
	machineNonce := "fake_nonce"
	stateInfo := FakeStateInfo(machineId)
	apiInfo := FakeAPIInfo(machineId)
	machineConfig, err := environs.NewMachineConfig(
		machineId,
		machineNonce,
		imagemetadata.ReleasedStream,
		series,
		networks,
		stateInfo,
		apiInfo,
	)
	if err != nil {
		return nil, nil, nil, err
	}
	params.Tools = possibleTools
	params.MachineConfig = machineConfig
	return env.StartInstance(params)
}

// FindBootstrapTools returns a ToolsList containing only those tools with
// which it would be reasonable to launch an environment's first machine, given the supplied constraints.
// If a specific agent version is not requested, all tools matching the current major.minor version are chosen.
func FindBootstrapTools(cloudInst environs.ConfigGetter, params BootstrapToolsParams) (list coretools.List, err error) {
	// Construct a tools filter.
	cfg := cloudInst.Config()
	cliVersion := version.Current.Number
	filter := coretools.Filter{
		Series: params.Series,
		Arch:   stringOrEmpty(params.Arch),
	}
	if params.Version != nil {
		// If we already have an explicit agent version set, we're done.
		filter.Number = *params.Version
		return bootstrapFindTools(cloudInst, cliVersion.Major, cliVersion.Minor, filter, params.AllowRetry)
	}
	if dev := cliVersion.IsDev() || cfg.Development(); !dev {
		logger.Infof("filtering tools by released version")
		filter.Released = true
	}
	return bootstrapFindTools(cloudInst, cliVersion.Major, cliVersion.Minor, filter, params.AllowRetry)
}

// StartInstanceWithParams is a test helper function that starts an instance
// with the given parameters, and a plausible but invalid configuration, and
// returns the result of Environ.StartInstance. The provided params's
// InstanceConfig and Tools field values will be ignored.
func StartInstanceWithParams(
	env environs.Environ, machineId string,
	params environs.StartInstanceParams,
	networks []string,
) (
	*environs.StartInstanceResult, error,
) {
	series := config.PreferredSeries(env.Config())
	agentVersion, ok := env.Config().AgentVersion()
	if !ok {
		return nil, errors.New("missing agent version in environment config")
	}
	filter := coretools.Filter{
		Number: agentVersion,
		Series: series,
	}
	if params.Constraints.Arch != nil {
		filter.Arch = *params.Constraints.Arch
	}
	possibleTools, err := tools.FindTools(env, -1, -1, filter)
	if err != nil {
		return nil, errors.Trace(err)
	}
	machineNonce := "fake_nonce"
	stateInfo := FakeStateInfo(machineId)
	apiInfo := FakeAPIInfo(machineId)
	instanceConfig, err := instancecfg.NewInstanceConfig(
		machineId,
		machineNonce,
		imagemetadata.ReleasedStream,
		series,
		true,
		networks,
		stateInfo,
		apiInfo,
	)
	if err != nil {
		return nil, errors.Trace(err)
	}
	params.Tools = possibleTools
	params.InstanceConfig = instanceConfig
	return env.StartInstance(params)
}

func fillinStartInstanceParams(env environs.Environ, machineId string, isController bool, params *environs.StartInstanceParams) error {
	if params.ControllerUUID == "" {
		return errors.New("missing controller UUID in start instance parameters")
	}
	preferredSeries := config.PreferredSeries(env.Config())
	agentVersion, ok := env.Config().AgentVersion()
	if !ok {
		return errors.New("missing agent version in model config")
	}
	filter := coretools.Filter{
		Number: agentVersion,
		Series: preferredSeries,
	}
	if params.Constraints.Arch != nil {
		filter.Arch = *params.Constraints.Arch
	}
	stream := tools.PreferredStream(&agentVersion, env.Config().Development(), env.Config().AgentStream())
	possibleTools, err := tools.FindTools(env, -1, -1, stream, filter)
	if err != nil {
		return errors.Trace(err)
	}

	if params.ImageMetadata == nil {
		if err := SetImageMetadata(
			env,
			possibleTools.AllSeries(),
			possibleTools.Arches(),
			&params.ImageMetadata,
		); err != nil {
			return errors.Trace(err)
		}
	}

	machineNonce := "fake_nonce"
	apiInfo := FakeAPIInfo(machineId)
	instanceConfig, err := instancecfg.NewInstanceConfig(
		testing.ControllerTag,
		machineId,
		machineNonce,
		imagemetadata.ReleasedStream,
		preferredSeries,
		apiInfo,
	)
	if err != nil {
		return errors.Trace(err)
	}
	if isController {
		instanceConfig.Controller = &instancecfg.ControllerConfig{
			Config: testing.FakeControllerConfig(),
			MongoInfo: &mongo.MongoInfo{
				Info: mongo.Info{
					Addrs:  []string{"127.0.0.1:1234"},
					CACert: "CA CERT\n" + testing.CACert,
				},
				Password: "mongosecret",
				Tag:      names.NewMachineTag(machineId),
			},
		}
		instanceConfig.Jobs = []multiwatcher.MachineJob{multiwatcher.JobHostUnits, multiwatcher.JobManageModel}
	}
	cfg := env.Config()
	instanceConfig.Tags = instancecfg.InstanceTags(env.Config().UUID(), params.ControllerUUID, cfg, nil)
	params.Tools = possibleTools
	params.InstanceConfig = instanceConfig
	return nil
}