package cmd

import (
	"fmt"
	"path/filepath"
	"time"

	"github.com/spf13/cobra"
	"github.com/warrenronsiek/ctask/internal/config"
	"github.com/warrenronsiek/ctask/internal/workspace"
)

var attachCmd = &cobra.Command{
	Use:          "attach <workspace>",
	Short:        "Attach to a workspace via tmux (always uses persistent session, regardless of CTASK_SESSION_MODE)",
	Args:         cobra.ExactArgs(1),
	SilenceUsage: true,
	RunE:         runAttach,
}

var (
	attachAgent string
	attachForce bool
)

func init() {
	attachCmd.Flags().StringVarP(&attachAgent, "agent", "a", "", "Override agent command")
	attachCmd.Flags().BoolVar(&attachForce, "force", false, "Skip active-session and stale-workspace warnings (owner-create path only)")
	attachCmd.ValidArgsFunction = completeWorkspaces(completionActive)
	rootCmd.AddCommand(attachCmd)
}

func runAttach(cmd *cobra.Command, args []string) error {
	roots := config.SearchRoots()
	// Active-only resolution per spec §9 (matches resume's completion filter).
	ws := resolveOne(roots, args[0], false)

	// updated_at bump (existing v0.4 behavior).
	now := time.Now().UTC().Truncate(time.Second)
	ws.Meta.UpdatedAt = now
	metaPath := filepath.Join(ws.Path, "task.yaml")
	if err := workspace.WriteMetaLocked(metaPath, ws.Meta); err != nil {
		return fmt.Errorf("updating metadata: %w", err)
	}

	resolved, err := resolveEntryAgent(ws.Meta.Agent, attachAgent)
	if err != nil {
		return err
	}

	return runWorkspaceEntry(WorkspaceEntryOptions{
		WsPath:           ws.Path,
		WsRoot:           ws.Root,
		WsMeta:           ws.Meta,
		ResolvedAgent:    resolved,
		Shell:            false, // attach defaults to agent
		Force:            attachForce,
		AlwaysPersistent: true, // attach is always tmux, regardless of env
		CommandName:      "attach",
	})
}