package list

import (
	"context"
	"fmt"
	"strings"

	"github.com/stackitcloud/stackit-cli/internal/pkg/types"

	"github.com/spf13/cobra"
	"github.com/stackitcloud/stackit-cli/internal/pkg/args"
	"github.com/stackitcloud/stackit-cli/internal/pkg/errors"
	"github.com/stackitcloud/stackit-cli/internal/pkg/examples"
	"github.com/stackitcloud/stackit-cli/internal/pkg/flags"
	"github.com/stackitcloud/stackit-cli/internal/pkg/globalflags"
	"github.com/stackitcloud/stackit-cli/internal/pkg/print"
	"github.com/stackitcloud/stackit-cli/internal/pkg/projectname"
	"github.com/stackitcloud/stackit-cli/internal/pkg/services/iaas/client"
	"github.com/stackitcloud/stackit-cli/internal/pkg/tables"
	"github.com/stackitcloud/stackit-cli/internal/pkg/utils"
	"github.com/stackitcloud/stackit-sdk-go/services/iaas"
)

const (
	limitFlag         = "limit"
	labelSelectorFlag = "label-selector"
)

type inputModel struct {
	*globalflags.GlobalFlagModel
	Limit         *int64
	LabelSelector *string
}

func NewCmd(params *types.CmdParams) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "list",
		Short: "Lists all backups",
		Long:  "Lists all backups in a project.",
		Args:  args.NoArgs,
		Example: examples.Build(
			examples.NewExample(
				`List all backups`,
				"$ stackit volume backup list"),
			examples.NewExample(
				`List all backups in JSON format`,
				"$ stackit volume backup list --output-format json"),
			examples.NewExample(
				`List up to 10 backups`,
				"$ stackit volume backup list --limit 10"),
			examples.NewExample(
				`List backups with specific labels`,
				"$ stackit volume backup list --label-selector key1=value1,key2=value2"),
		),
		RunE: func(cmd *cobra.Command, args []string) error {
			ctx := context.Background()
			model, err := parseInput(params.Printer, cmd, args)
			if err != nil {
				return err
			}

			// Configure API client
			apiClient, err := client.ConfigureClient(params.Printer, params.CliVersion)
			if err != nil {
				return err
			}

			// Call API
			req := buildRequest(ctx, model, apiClient)
			resp, err := req.Execute()
			if err != nil {
				return fmt.Errorf("get backups: %w", err)
			}
			if resp.Items == nil || len(*resp.Items) == 0 {
				projectLabel, err := projectname.GetProjectName(ctx, params.Printer, params.CliVersion, cmd)
				if err != nil {
					params.Printer.Debug(print.ErrorLevel, "get project name: %v", err)
					projectLabel = model.ProjectId
				}
				params.Printer.Info("No backups found for project %s\n", projectLabel)
				return nil
			}
			backups := *resp.Items

			// Truncate output
			if model.Limit != nil && len(backups) > int(*model.Limit) {
				backups = backups[:*model.Limit]
			}

			return outputResult(params.Printer, model.OutputFormat, backups)
		},
	}

	configureFlags(cmd)
	return cmd
}

func configureFlags(cmd *cobra.Command) {
	cmd.Flags().Int64(limitFlag, 0, "Maximum number of entries to list")
	cmd.Flags().String(labelSelectorFlag, "", "Filter backups by labels")
}

func parseInput(p *print.Printer, cmd *cobra.Command, _ []string) (*inputModel, error) {
	globalFlags := globalflags.Parse(p, cmd)
	if globalFlags.ProjectId == "" {
		return nil, &errors.ProjectIdError{}
	}

	limit := flags.FlagToInt64Pointer(p, cmd, limitFlag)
	if limit != nil && *limit < 1 {
		return nil, &errors.FlagValidationError{
			Flag:    limitFlag,
			Details: "must be greater than 0",
		}
	}

	labelSelector := flags.FlagToStringPointer(p, cmd, labelSelectorFlag)

	model := inputModel{
		GlobalFlagModel: globalFlags,
		Limit:           limit,
		LabelSelector:   labelSelector,
	}

	p.DebugInputModel(model)
	return &model, nil
}

func buildRequest(ctx context.Context, model *inputModel, apiClient *iaas.APIClient) iaas.ApiListBackupsRequest {
	req := apiClient.ListBackups(ctx, model.ProjectId, model.Region)

	if model.LabelSelector != nil {
		req = req.LabelSelector(*model.LabelSelector)
	}

	return req
}

func outputResult(p *print.Printer, outputFormat string, backups []iaas.Backup) error {
	if backups == nil {
		return fmt.Errorf("backups is empty")
	}

	return p.OutputResult(outputFormat, backups, func() error {
		table := tables.NewTable()
		table.SetHeader("ID", "NAME", "SIZE", "STATUS", "SNAPSHOT ID", "VOLUME ID", "AVAILABILITY ZONE", "LABELS", "CREATED AT", "UPDATED AT")

		for _, backup := range backups {
			var labelsString string
			if backup.Labels != nil {
				var labels []string
				for key, value := range *backup.Labels {
					labels = append(labels, fmt.Sprintf("%s: %s", key, value))
				}
				labelsString = strings.Join(labels, ", ")
			}

			table.AddRow(
				utils.PtrString(backup.Id),
				utils.PtrString(backup.Name),
				utils.PtrGigaByteSizeDefault(backup.Size, "n/a"),
				utils.PtrString(backup.Status),
				utils.PtrString(backup.SnapshotId),
				utils.PtrString(backup.VolumeId),
				utils.PtrString(backup.AvailabilityZone),
				labelsString,
				utils.ConvertTimePToDateTimeString(backup.CreatedAt),
				utils.ConvertTimePToDateTimeString(backup.UpdatedAt),
			)
			table.AddSeparator()
		}

		p.Outputln(table.Render())
		return nil
	})
}
