package list

import (
	"context"
	"fmt"

	"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/services/service-account/client"
	"github.com/stackitcloud/stackit-cli/internal/pkg/tables"
	"github.com/stackitcloud/stackit-cli/internal/pkg/utils"
	"github.com/stackitcloud/stackit-sdk-go/services/serviceaccount"
)

const (
	limitFlag               = "limit"
	serviceAccountEmailFlag = "email"
)

type inputModel struct {
	*globalflags.GlobalFlagModel

	ServiceAccountEmail string
	Limit               *int64
}

func NewCmd(params *types.CmdParams) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "list",
		Short: "Lists all service account keys",
		Long:  "Lists all service account keys.",
		Args:  args.NoArgs,
		Example: examples.Build(
			examples.NewExample(
				`List all keys belonging to the service account with email "my-service-account-1234567@sa.stackit.cloud"`,
				"$ stackit service-account key list --email my-service-account-1234567@sa.stackit.cloud"),
			examples.NewExample(
				`List all keys belonging to the service account with email "my-service-account-1234567@sa.stackit.cloud" in JSON format`,
				"$ stackit service-account key list --email my-service-account-1234567@sa.stackit.cloud --output-format json"),
			examples.NewExample(
				`List up to 10 keys belonging to the service account with email "my-service-account-1234567@sa.stackit.cloud"`,
				"$ stackit service-account key list --email my-service-account-1234567@sa.stackit.cloud --limit 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
			}

			// Call API
			req := buildRequest(ctx, model, apiClient)
			resp, err := req.Execute()
			if err != nil {
				return fmt.Errorf("list keys metadata: %w", err)
			}
			keys := *resp.Items
			if len(keys) == 0 {
				params.Printer.Info("No keys found for service account %s\n", model.ServiceAccountEmail)
				return nil
			}

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

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

	configureFlags(cmd)
	return cmd
}

func configureFlags(cmd *cobra.Command) {
	cmd.Flags().StringP(serviceAccountEmailFlag, "e", "", "Service account email")
	cmd.Flags().Int64(limitFlag, 0, "Maximum number of entries to list")

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

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

	email := flags.FlagToStringValue(p, cmd, serviceAccountEmailFlag)
	if email == "" {
		return nil, &errors.FlagValidationError{
			Flag:    serviceAccountEmailFlag,
			Details: "can't be empty",
		}
	}

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

	model := inputModel{
		GlobalFlagModel:     globalFlags,
		ServiceAccountEmail: email,
		Limit:               limit,
	}

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

func buildRequest(ctx context.Context, model *inputModel, apiClient *serviceaccount.APIClient) serviceaccount.ApiListServiceAccountKeysRequest {
	req := apiClient.ListServiceAccountKeys(ctx, model.ProjectId, model.ServiceAccountEmail)
	return req
}

func outputResult(p *print.Printer, outputFormat string, keys []serviceaccount.ServiceAccountKeyListResponse) error {
	return p.OutputResult(outputFormat, keys, func() error {
		table := tables.NewTable()
		table.SetHeader("ID", "ACTIVE", "CREATED_AT", "VALID_UNTIL")
		for i := range keys {
			k := keys[i]
			validUntil := "does not expire"
			if k.ValidUntil != nil {
				validUntil = k.ValidUntil.String()
			}
			table.AddRow(
				utils.PtrString(k.Id),
				utils.PtrString(k.Active),
				utils.PtrString(k.CreatedAt),
				validUntil,
			)
		}
		err := table.Display(p)
		if err != nil {
			return fmt.Errorf("render table: %w", err)
		}

		return nil
	})
}
