// formatConfigTabular writes a tabular summary of config information.
func formatConfigTabular(writer io.Writer, value interface{}) error {
	configValues, ok := value.(config.ConfigValues)
	if !ok {
		return errors.Errorf("expected value of type %T, got %T", configValues, value)
	}

	tw := output.TabWriter(writer)
	w := output.Wrapper{tw}

	var valueNames []string
	for name := range configValues {
		valueNames = append(valueNames, name)
	}
	sort.Strings(valueNames)
	w.Println("Attribute", "From", "Value")

	for _, name := range valueNames {
		info := configValues[name]
		out := &bytes.Buffer{}
		err := cmd.FormatYaml(out, info.Value)
		if err != nil {
			return errors.Annotatef(err, "formatting value for %q", name)
		}
		// Some attribute values have a newline appended
		// which makes the output messy.
		valString := strings.TrimSuffix(out.String(), "\n")
		w.Println(name, info.Source, valString)
	}

	tw.Flush()
	return nil
}

func formatServiceDetailTabular(writer io.Writer, resources FormattedServiceDetails) {
	// note that the unit resource can be a zero value here, to indicate that
	// the unit has not downloaded that resource yet.

	fmt.Fprintln(writer, "[Units]")

	sort.Sort(byUnitID(resources.Resources))
	// To format things into columns.
	tw := output.TabWriter(writer)

	// Write the header.
	fmt.Fprintln(tw, "Unit\tResource\tRevision\tExpected")

	for _, r := range resources.Resources {
		fmt.Fprintf(tw, "%v\t%v\t%v\t%v\n",
			r.unitNumber,
			r.Expected.Name,
			r.Unit.combinedRevision,
			r.revProgress,
		)
	}
	tw.Flush()

	writeUpdates(resources.Updates, writer, tw)
}

// FormatTabular writes a tabular summary of payloads.
func FormatTabular(writer io.Writer, value interface{}) error {
	payloads, valueConverted := value.([]FormattedPayload)
	if !valueConverted {
		return errors.Errorf("expected value of type %T, got %T", payloads, value)
	}

	// TODO(ericsnow) sort the rows first?

	tw := output.TabWriter(writer)

	// Write the header.
	fmt.Fprintln(tw, tabularSection)
	fmt.Fprintln(tw, tabularHeader)

	// Print each payload to its own row.
	for _, payload := range payloads {
		// tabularColumns must be kept in sync with these.
		fmt.Fprintf(tw, tabularRow+"\n",
			payload.Unit,
			payload.Machine,
			payload.Class,
			payload.Status,
			payload.Type,
			payload.ID,
			strings.Join(payload.Labels, " "),
		)
	}
	tw.Flush()

	return nil
}

func (c *listCommand) formatModelUsers(writer io.Writer, value interface{}) error {
	users, ok := value.(map[string]common.ModelUserInfo)
	if !ok {
		return errors.Errorf("expected value of type %T, got %T", users, value)
	}
	modelUsers := set.NewStrings()
	for name := range users {
		modelUsers.Add(name)
	}
	tw := output.TabWriter(writer)
	w := output.Wrapper{tw}
	w.Println("Name", "Display name", "Access", "Last connection")
	for _, name := range modelUsers.SortedValues() {
		user := users[name]

		var highlight *ansiterm.Context
		userName := name
		if c.isLoggedInUser(name) {
			userName += "*"
			highlight = output.CurrentHighlight
		}
		w.PrintColor(highlight, userName)
		w.Println(user.DisplayName, user.Access, user.LastConnection)
	}
	tw.Flush()
	return nil
}

func (c *listCommand) formatControllerUsers(writer io.Writer, value interface{}) error {
	users, valueConverted := value.([]UserInfo)
	if !valueConverted {
		return errors.Errorf("expected value of type %T, got %T", users, value)
	}

	tw := output.TabWriter(writer)
	w := output.Wrapper{tw}
	w.Println("Controller: " + c.ControllerName())
	w.Println()
	w.Println("Name", "Display name", "Access", "Date created", "Last connection")
	for _, user := range users {
		conn := user.LastConnection
		if user.Disabled {
			conn += " (disabled)"
		}
		var highlight *ansiterm.Context
		userName := user.Username
		if c.isLoggedInUser(user.Username) {
			userName += "*"
			highlight = output.CurrentHighlight
		}
		w.PrintColor(highlight, userName)
		w.Println(user.DisplayName, user.Access, user.DateCreated, conn)
	}
	tw.Flush()
	return nil
}

// FormatCharmTabular returns a tabular summary of charm resources.
func FormatCharmTabular(writer io.Writer, value interface{}) error {
	resources, valueConverted := value.([]FormattedCharmResource)
	if !valueConverted {
		return errors.Errorf("expected value of type %T, got %T", resources, value)
	}

	// TODO(ericsnow) sort the rows first?

	// To format things into columns.
	tw := output.TabWriter(writer)

	// Write the header.
	// We do not print a section label.
	fmt.Fprintln(tw, "Resource\tRevision")

	// Print each info to its own row.
	for _, res := range resources {
		// the column headers must be kept in sync with these.
		fmt.Fprintf(tw, "%s\t%d\n",
			res.Name,
			res.Revision,
		)
	}
	tw.Flush()

	return nil
}

// formatPoolsTabular returns a tabular summary of pool instances.
func formatPoolsTabular(writer io.Writer, pools map[string]PoolInfo) {
	tw := output.TabWriter(writer)
	print := func(values ...string) {
		fmt.Fprintln(tw, strings.Join(values, "\t"))
	}

	print("Name", "Provider", "Attrs")

	poolNames := make([]string, 0, len(pools))
	for name := range pools {
		poolNames = append(poolNames, name)
	}
	sort.Strings(poolNames)
	for _, name := range poolNames {
		pool := pools[name]
		// order by key for deterministic return
		keys := make([]string, 0, len(pool.Attrs))
		for key := range pool.Attrs {
			keys = append(keys, key)
		}
		sort.Strings(keys)
		attrs := make([]string, len(pool.Attrs))
		for i, key := range keys {
			attrs[i] = fmt.Sprintf("%v=%v", key, pool.Attrs[key])
		}
		print(name, pool.Provider, strings.Join(attrs, " "))
	}
	tw.Flush()
}

func formatRegionsTabular(writer io.Writer, regions yaml.MapSlice) error {
	tw := output.TabWriter(writer)
	w := output.Wrapper{tw}
	for _, r := range regions {
		w.Println(r.Key)
	}
	tw.Flush()
	return nil
}

func newSummaryFormatter(writer io.Writer) *summaryFormatter {
	f := &summaryFormatter{
		ipAddrs:     make([]net.IPNet, 0),
		netStrings:  make([]string, 0),
		openPorts:   set.NewStrings(),
		stateToUnit: make(map[status.Status]int),
	}
	f.tw = output.TabWriter(writer)
	return f
}

// formatCloudsTabular writes a tabular summary of cloud information.
func formatCloudsTabular(writer io.Writer, value interface{}) error {
	clouds, ok := value.(*cloudList)
	if !ok {
		return errors.Errorf("expected value of type %T, got %T", clouds, value)
	}

	tw := output.TabWriter(writer)
	p := func(values ...string) {
		text := strings.Join(values, "\t")
		fmt.Fprintln(tw, text)
	}
	p("CLOUD\tTYPE\tREGIONS")

	cloudNamesSorted := func(someClouds map[string]*cloudDetails) []string {
		// For tabular we'll sort alphabetically, user clouds last.
		var names []string
		for name, _ := range someClouds {
			names = append(names, name)
		}
		sort.Strings(names)
		return names
	}

	printClouds := func(someClouds map[string]*cloudDetails) {
		cloudNames := cloudNamesSorted(someClouds)

		for _, name := range cloudNames {
			info := someClouds[name]
			var regions []string
			for _, region := range info.Regions {
				regions = append(regions, fmt.Sprint(region.Key))
			}
			// TODO(wallyworld) - we should be smarter about handling
			// long region text, for now we'll display the first 7 as
			// that covers all clouds except AWS and Azure and will
			// prevent wrapping on a reasonable terminal width.
			regionCount := len(regions)
			if regionCount > 7 {
				regionCount = 7
			}
			regionText := strings.Join(regions[:regionCount], ", ")
			if len(regions) > 7 {
				regionText = regionText + " ..."
			}
			p(name, info.CloudType, regionText)
		}
	}
	printClouds(clouds.public)
	printClouds(clouds.builtin)
	printClouds(clouds.personal)

	tw.Flush()
	return nil
}

// formatVolumeListTabular returns a tabular summary of volume instances.
func formatVolumeListTabular(writer io.Writer, infos map[string]VolumeInfo) error {
	tw := output.TabWriter(writer)

	print := func(values ...string) {
		fmt.Fprintln(tw, strings.Join(values, "\t"))
	}
	print("Machine", "Unit", "Storage", "Id", "Provider Id", "Device", "Size", "State", "Message")

	volumeAttachmentInfos := make(volumeAttachmentInfos, 0, len(infos))
	for volumeId, info := range infos {
		volumeAttachmentInfo := volumeAttachmentInfo{
			VolumeId:   volumeId,
			VolumeInfo: info,
		}
		if info.Attachments == nil {
			volumeAttachmentInfos = append(volumeAttachmentInfos, volumeAttachmentInfo)
			continue
		}
		// Each unit attachment must have a corresponding volume
		// attachment. Enumerate each of the volume attachments,
		// and locate the corresponding unit attachment if any.
		// Each volume attachment has at most one corresponding
		// unit attachment.
		for machineId, machineInfo := range info.Attachments.Machines {
			volumeAttachmentInfo := volumeAttachmentInfo
			volumeAttachmentInfo.MachineId = machineId
			volumeAttachmentInfo.MachineVolumeAttachment = machineInfo
			for unitId, unitInfo := range info.Attachments.Units {
				if unitInfo.MachineId == machineId {
					volumeAttachmentInfo.UnitId = unitId
					volumeAttachmentInfo.UnitStorageAttachment = unitInfo
					break
				}
			}
			volumeAttachmentInfos = append(volumeAttachmentInfos, volumeAttachmentInfo)
		}
	}
	sort.Sort(volumeAttachmentInfos)

	for _, info := range volumeAttachmentInfos {
		var size string
		if info.Size > 0 {
			size = humanize.IBytes(info.Size * humanize.MiByte)
		}
		print(
			info.MachineId, info.UnitId, info.Storage,
			info.VolumeId, info.ProviderVolumeId,
			info.DeviceName, size,
			string(info.Status.Current), info.Status.Message,
		)
	}

	return tw.Flush()
}

// formatFilesystemListTabular writes a tabular summary of filesystem instances.
func formatFilesystemListTabular(writer io.Writer, infos map[string]FilesystemInfo) error {
	tw := output.TabWriter(writer)

	print := func(values ...string) {
		fmt.Fprintln(tw, strings.Join(values, "\t"))
	}
	print("MACHINE", "UNIT", "STORAGE", "ID", "VOLUME", "PROVIDER-ID", "MOUNTPOINT", "SIZE", "STATE", "MESSAGE")

	filesystemAttachmentInfos := make(filesystemAttachmentInfos, 0, len(infos))
	for filesystemId, info := range infos {
		filesystemAttachmentInfo := filesystemAttachmentInfo{
			FilesystemId:   filesystemId,
			FilesystemInfo: info,
		}
		if info.Attachments == nil {
			filesystemAttachmentInfos = append(filesystemAttachmentInfos, filesystemAttachmentInfo)
			continue
		}
		// Each unit attachment must have a corresponding filesystem
		// attachment. Enumerate each of the filesystem attachments,
		// and locate the corresponding unit attachment if any.
		// Each filesystem attachment has at most one corresponding
		// unit attachment.
		for machineId, machineInfo := range info.Attachments.Machines {
			filesystemAttachmentInfo := filesystemAttachmentInfo
			filesystemAttachmentInfo.MachineId = machineId
			filesystemAttachmentInfo.MachineFilesystemAttachment = machineInfo
			for unitId, unitInfo := range info.Attachments.Units {
				if unitInfo.MachineId == machineId {
					filesystemAttachmentInfo.UnitId = unitId
					filesystemAttachmentInfo.UnitStorageAttachment = unitInfo
					break
				}
			}
			filesystemAttachmentInfos = append(filesystemAttachmentInfos, filesystemAttachmentInfo)
		}
	}
	sort.Sort(filesystemAttachmentInfos)

	for _, info := range filesystemAttachmentInfos {
		var size string
		if info.Size > 0 {
			size = humanize.IBytes(info.Size * humanize.MiByte)
		}
		print(
			info.MachineId, info.UnitId, info.Storage,
			info.FilesystemId, info.Volume, info.ProviderFilesystemId,
			info.MountPoint, size,
			string(info.Status.Current), info.Status.Message,
		)
	}

	return tw.Flush()
}

// formatMetadataTabular writes a tabular summary of cloud image metadata.
func formatMetadataTabular(writer io.Writer, metadata []MetadataInfo) {
	tw := output.TabWriter(writer)
	print := func(values ...string) {
		fmt.Fprintln(tw, strings.Join(values, "\t"))
	}
	print("Source", "Series", "Arch", "Region", "Image id", "Stream", "Virt Type", "Storage Type")

	for _, m := range metadata {
		print(m.Source, m.Series, m.Arch, m.Region, m.ImageId, m.Stream, m.VirtType, m.RootStorageType)
	}
	tw.Flush()
}

// formatConfigTabular writes a tabular summary of default config information.
func formatDefaultConfigTabular(writer io.Writer, value interface{}) error {
	defaultValues, ok := value.(config.ModelDefaultAttributes)
	if !ok {
		return errors.Errorf("expected value of type %T, got %T", defaultValues, value)
	}

	tw := output.TabWriter(writer)
	w := output.Wrapper{tw}

	p := func(name string, value config.AttributeDefaultValues) {
		var c, d interface{}
		switch value.Default {
		case nil:
			d = "-"
		case "":
			d = `""`
		default:
			d = value.Default
		}
		switch value.Controller {
		case nil:
			c = "-"
		case "":
			c = `""`
		default:
			c = value.Controller
		}
		w.Println(name, d, c)
		for _, region := range value.Regions {
			w.Println("  "+region.Name, region.Value, "-")
		}
	}
	var valueNames []string
	for name := range defaultValues {
		valueNames = append(valueNames, name)
	}
	sort.Strings(valueNames)

	w.Println("Attribute", "Default", "Controller")

	for _, name := range valueNames {
		info := defaultValues[name]
		out := &bytes.Buffer{}
		err := cmd.FormatYaml(out, info)
		if err != nil {
			return errors.Annotatef(err, "formatting value for %q", name)
		}
		p(name, info)
	}

	tw.Flush()
	return nil
}

// FormatMachineTabular writes a tabular summary of machine
func FormatMachineTabular(writer io.Writer, forceColor bool, value interface{}) error {
	fs, valueConverted := value.(formattedMachineStatus)
	if !valueConverted {
		return errors.Errorf("expected value of type %T, got %T", fs, value)
	}
	tw := output.TabWriter(writer)
	if forceColor {
		tw.SetColorCapable(forceColor)
	}
	printMachines(tw, fs.Machines)
	tw.Flush()

	return nil
}

// printTabular prints the list of actions in tabular format
func (c *listCommand) printTabular(writer io.Writer, value interface{}) error {
	list, ok := value.([]listOutput)
	if !ok {
		return errors.New("unexpected value")
	}

	tw := output.TabWriter(writer)
	fmt.Fprintf(tw, "%s\t%s\n", "Action", "Description")
	for _, value := range list {
		fmt.Fprintf(tw, "%s\t%s\n", value.action, strings.TrimSpace(value.description))
	}
	tw.Flush()
	return nil
}

// formatCloudsTabular writes a tabular summary of cloud information.
func formatCloudsTabular(writer io.Writer, value interface{}) error {
	clouds, ok := value.(*cloudList)
	if !ok {
		return errors.Errorf("expected value of type %T, got %T", clouds, value)
	}

	tw := output.TabWriter(writer)
	w := output.Wrapper{tw}
	w.Println("Cloud", "Regions", "Default", "Type", "Description")
	w.SetColumnAlignRight(1)

	cloudNamesSorted := func(someClouds map[string]*cloudDetails) []string {
		// For tabular we'll sort alphabetically, user clouds last.
		var names []string
		for name, _ := range someClouds {
			names = append(names, name)
		}
		sort.Strings(names)
		return names
	}

	printClouds := func(someClouds map[string]*cloudDetails, color *ansiterm.Context) {
		cloudNames := cloudNamesSorted(someClouds)

		for _, name := range cloudNames {
			info := someClouds[name]
			defaultRegion := ""
			if len(info.Regions) > 0 {
				defaultRegion = info.RegionsMap[info.Regions[0].Key.(string)].Name
			}
			description := info.CloudDescription
			if len(description) > 40 {
				description = description[:39]
			}
			w.PrintColor(color, name)
			w.Println(len(info.Regions), defaultRegion, info.CloudType, description)
		}
	}
	printClouds(clouds.public, nil)
	printClouds(clouds.builtin, nil)
	printClouds(clouds.personal, ansiterm.Foreground(ansiterm.BrightBlue))

	w.Println("\nTry 'list-regions <cloud>' to see available regions.")
	w.Println("'show-cloud <cloud>' or 'regions --format yaml <cloud>' can be used to see region endpoints.")
	w.Println("'add-cloud' can add private clouds or private infrastructure.")
	w.Println("Update the known public clouds with 'update-clouds'.")
	tw.Flush()
	return nil
}

func formatWhoAmITabular(writer io.Writer, value interface{}) error {
	details, ok := value.(whoAmI)
	if !ok {
		return errors.Errorf("expected value of type %T, got %T", details, value)
	}
	tw := output.TabWriter(writer)
	fmt.Fprintf(tw, "Controller:\t%s\n", details.ControllerName)
	modelName := details.ModelName
	if modelName == "" {
		modelName = "<no-current-model>"
	}
	fmt.Fprintf(tw, "Model:\t%s\n", modelName)
	fmt.Fprintf(tw, "User:\t%s", details.UserName)
	return tw.Flush()
}

// FormatTabularBlockedModels writes out tabular format for blocked models.
// This method is exported as it is also used by destroy-model.
func FormatTabularBlockedModels(writer io.Writer, value interface{}) error {
	models, ok := value.([]modelBlockInfo)
	if !ok {
		return errors.Errorf("expected value of type %T, got %T", models, value)
	}

	tw := output.TabWriter(writer)
	w := output.Wrapper{tw}
	w.Println("Name", "Model UUID", "Owner", "Disabled commands")
	for _, model := range models {
		w.Println(model.Name, model.UUID, model.Owner, strings.Join(model.CommandSets, ", "))
	}
	tw.Flush()
	return nil
}

// formatCredentialsTabular writes a tabular summary of cloud information.
func formatCredentialsTabular(writer io.Writer, value interface{}) error {
	credentials, ok := value.(credentialsMap)
	if !ok {
		return errors.Errorf("expected value of type %T, got %T", credentials, value)
	}

	if len(credentials.Credentials) == 0 {
		fmt.Fprintln(writer, "No credentials to display.")
		return nil
	}

	// For tabular we'll sort alphabetically by cloud, and then by credential name.
	var cloudNames []string
	for name := range credentials.Credentials {
		cloudNames = append(cloudNames, name)
	}
	sort.Strings(cloudNames)

	tw := output.TabWriter(writer)
	p := func(values ...string) {
		text := strings.Join(values, "\t")
		fmt.Fprintln(tw, text)
	}
	p("CLOUD\tCREDENTIALS")
	for _, cloudName := range cloudNames {
		var haveDefault bool
		var credentialNames []string
		credentials := credentials.Credentials[cloudName]
		for credentialName := range credentials.Credentials {
			if credentialName == credentials.DefaultCredential {
				credentialNames = append([]string{credentialName + "*"}, credentialNames...)
				haveDefault = true
			} else {
				credentialNames = append(credentialNames, credentialName)
			}
		}
		if haveDefault {
			sort.Strings(credentialNames[1:])
		} else {
			sort.Strings(credentialNames)
		}
		p(cloudName, strings.Join(credentialNames, ", "))
	}
	tw.Flush()

	return nil
}