package update

import (
	"context"
	"fmt"

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

	"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/services/postgresflex/client"
	postgresflexUtils "github.com/stackitcloud/stackit-cli/internal/pkg/services/postgresflex/utils"

	"github.com/spf13/cobra"
	"github.com/stackitcloud/stackit-sdk-go/services/postgresflex"
)

const (
	userIdArg = "USER_ID"

	instanceIdFlag = "instance-id"
	roleFlag       = "role"
)

type inputModel struct {
	*globalflags.GlobalFlagModel

	InstanceId string
	UserId     string
	Roles      *[]string
}

func NewCmd(params *types.CmdParams) *cobra.Command {
	cmd := &cobra.Command{
		Use:   fmt.Sprintf("update %s", userIdArg),
		Short: "Updates a PostgreSQL Flex user",
		Long:  "Updates a PostgreSQL Flex user.",
		Example: examples.Build(
			examples.NewExample(
				`Update the roles of a PostgreSQL Flex user with ID "xxx" of instance with ID "yyy"`,
				"$ stackit postgresflex user update xxx --instance-id yyy --role login"),
		),
		Args: args.SingleArg(userIdArg, nil),
		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
			}

			instanceLabel, err := postgresflexUtils.GetInstanceName(ctx, apiClient, model.ProjectId, model.Region, model.InstanceId)
			if err != nil {
				params.Printer.Debug(print.ErrorLevel, "get instance name: %v", err)
				instanceLabel = model.InstanceId
			}

			userLabel, err := postgresflexUtils.GetUserName(ctx, apiClient, model.ProjectId, model.Region, model.InstanceId, model.UserId)
			if err != nil {
				params.Printer.Debug(print.ErrorLevel, "get user name: %v", err)
				userLabel = model.UserId
			}

			prompt := fmt.Sprintf("Are you sure you want to update user %q of instance %q?", userLabel, instanceLabel)
			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("update PostgreSQL Flex user: %w", err)
			}

			params.Printer.Info("Updated user %q of instance %q\n", userLabel, instanceLabel)
			return nil
		},
	}

	configureFlags(cmd)
	return cmd
}

func configureFlags(cmd *cobra.Command) {
	roleOptions := []string{"login", "createdb"}

	cmd.Flags().Var(flags.UUIDFlag(), instanceIdFlag, "ID of the instance")
	cmd.Flags().Var(flags.EnumSliceFlag(false, nil, roleOptions...), roleFlag, fmt.Sprintf("Roles of the user, possible values are %q", roleOptions))

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

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

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

	roles := flags.FlagToStringSlicePointer(p, cmd, roleFlag)
	if roles == nil {
		return nil, &errors.EmptyUpdateError{}
	}

	model := inputModel{
		GlobalFlagModel: globalFlags,
		InstanceId:      flags.FlagToStringValue(p, cmd, instanceIdFlag),
		UserId:          userId,
		Roles:           roles,
	}

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

func buildRequest(ctx context.Context, model *inputModel, apiClient *postgresflex.APIClient) postgresflex.ApiPartialUpdateUserRequest {
	req := apiClient.PartialUpdateUser(ctx, model.ProjectId, model.Region, model.InstanceId, model.UserId)
	req = req.PartialUpdateUserPayload(postgresflex.PartialUpdateUserPayload{
		Roles: model.Roles,
	})
	return req
}
