package resize

import (
	"context"
	"fmt"

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

	"github.com/stackitcloud/stackit-cli/internal/pkg/args"
	cliErr "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/services/iaas/client"
	iaasUtils "github.com/stackitcloud/stackit-cli/internal/pkg/services/iaas/utils"
	"github.com/stackitcloud/stackit-cli/internal/pkg/utils"
	"github.com/stackitcloud/stackit-sdk-go/services/iaas"

	"github.com/spf13/cobra"
)

const (
	volumeIdArg = "VOLUME_ID"

	sizeFlag = "size"
)

type inputModel struct {
	*globalflags.GlobalFlagModel
	VolumeId string
	Size     *int64
}

func NewCmd(params *types.CmdParams) *cobra.Command {
	cmd := &cobra.Command{
		Use:   fmt.Sprintf("resize %s", volumeIdArg),
		Short: "Resizes a volume",
		Long:  "Resizes a volume.",
		Args:  args.SingleArg(volumeIdArg, utils.ValidateUUID),
		Example: examples.Build(
			examples.NewExample(
				`Resize volume with ID "xxx" with new size 10 GB`,
				`$ stackit volume resize xxx --size 10`,
			),
		),
		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
			}

			volumeLabel, err := iaasUtils.GetVolumeName(ctx, apiClient, model.ProjectId, model.Region, model.VolumeId)
			if err != nil {
				params.Printer.Debug(print.ErrorLevel, "get volume name: %v", err)
				volumeLabel = model.VolumeId
			}

			prompt := fmt.Sprintf("Are you sure you want to resize volume %q?", volumeLabel)
			err = params.Printer.PromptForConfirmation(prompt)
			if err != nil {
				return err
			}

			// Call API
			req := buildRequest(ctx, model, apiClient)
			err = req.Execute()
			if err != nil {
				return fmt.Errorf("resize volume: %w", err)
			}

			params.Printer.Outputf("Resized volume %q.\n", volumeLabel)
			return nil
		},
	}
	configureFlags(cmd)
	return cmd
}

func configureFlags(cmd *cobra.Command) {
	cmd.Flags().Int64(sizeFlag, 0, "Volume size (GB)")

	err := flags.MarkFlagsRequired(cmd, sizeFlag)
	cobra.CheckErr(err)
}

func parseInput(p *print.Printer, cmd *cobra.Command, inputArgs []string) (*inputModel, error) {
	volumeId := inputArgs[0]

	globalFlags := globalflags.Parse(p, cmd)
	if globalFlags.ProjectId == "" {
		return nil, &cliErr.ProjectIdError{}
	}

	model := inputModel{
		GlobalFlagModel: globalFlags,
		Size:            flags.FlagToInt64Pointer(p, cmd, sizeFlag),
		VolumeId:        volumeId,
	}

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

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

	payload := iaas.ResizeVolumePayload{
		Size: model.Size,
	}

	return req.ResizeVolumePayload(payload)
}
