package auth

import (
	"context"
	"fmt"

	"github.com/spf13/cobra"

	"github.com/Tencent/WeKnora/cli/internal/cmdutil"
	"github.com/Tencent/WeKnora/cli/internal/format"
	"github.com/Tencent/WeKnora/cli/internal/iostreams"
	sdk "github.com/Tencent/WeKnora/client"
)

// StatusOptions captures the (sparse) configuration of `weknora auth status`.
type StatusOptions struct {
	JSONOut bool
}

// StatusService is the narrow SDK surface auth status depends on.
type StatusService interface {
	GetCurrentUser(ctx context.Context) (*sdk.CurrentUserResponse, error)
}

// statusResult is the typed payload emitted by `--json`.
type statusResult struct {
	Context    string `json:"context"`
	UserID     string `json:"user_id,omitempty"`
	Email      string `json:"email,omitempty"`
	TenantID   uint64 `json:"tenant_id,omitempty"`
	TenantName string `json:"tenant_name,omitempty"`
}

// NewCmdStatus builds the `weknora auth status` command.
func NewCmdStatus(f *cmdutil.Factory) *cobra.Command {
	opts := &StatusOptions{}
	cmd := &cobra.Command{
		Use:   "status",
		Short: "Show the active context, principal, and token state",
		RunE: func(c *cobra.Command, args []string) error {
			cli, err := f.Client()
			if err != nil {
				return err
			}
			return runStatus(c.Context(), opts, f, cli)
		},
	}
	cmd.Flags().BoolVar(&opts.JSONOut, "json", false, "Output JSON envelope")
	return cmd
}

func runStatus(ctx context.Context, opts *StatusOptions, f *cmdutil.Factory, svc StatusService) error {
	if svc == nil {
		return cmdutil.NewError(cmdutil.CodeAuthUnauthenticated, "no SDK client available; run `weknora auth login`")
	}
	resp, err := svc.GetCurrentUser(ctx)
	if err != nil {
		return cmdutil.Wrapf(cmdutil.ClassifyHTTPError(err), err, "fetch current user")
	}
	user := resp.Data.User
	tenant := resp.Data.Tenant

	cfg, err := f.Config()
	if err != nil {
		return err
	}

	if opts.JSONOut {
		var tenantID uint64
		result := statusResult{Context: cfg.CurrentContext}
		if user != nil {
			result.UserID = user.ID
			result.Email = user.Email
			result.TenantID = user.TenantID
			tenantID = user.TenantID
		}
		if tenant != nil {
			result.TenantName = tenant.Name
		}
		return cmdutil.NewJSONExporter().Write(iostreams.IO.Out, format.Success(result, &format.Meta{
			Context:  cfg.CurrentContext,
			TenantID: tenantID,
		}))
	}

	host := ""
	if c, ok := cfg.Contexts[cfg.CurrentContext]; ok {
		host = c.Host
	}
	fmt.Fprintf(iostreams.IO.Out, "context: %s\n", cfg.CurrentContext)
	fmt.Fprintf(iostreams.IO.Out, "host:    %s\n", host)
	if user != nil {
		fmt.Fprintf(iostreams.IO.Out, "user:    %s (%s)\n", user.Email, user.ID)
		fmt.Fprintf(iostreams.IO.Out, "tenant:  %d", user.TenantID)
		if tenant != nil {
			fmt.Fprintf(iostreams.IO.Out, " (%s)", tenant.Name)
		}
		fmt.Fprintln(iostreams.IO.Out)
	}
	return nil
}