package inbox

import (
	"fmt"
	"time"

	"ai-workflow-skill/packages/coord-core/protocol"
	"ai-workflow-skill/packages/coord-core/store"

	"github.com/spf13/cobra"
)

type waitReplyOptions struct {
	threadID       string
	afterMessageID string
	afterEventID   int64
	kinds          string
	timeoutSeconds int
}

func newWaitReplyCmd(root *rootOptions) *cobra.Command {
	opts := &waitReplyOptions{}

	cmd := &cobra.Command{
		Use:   "wait-reply",
		Short: "Block until a reply-like message appears in a thread",
		Long: helpLong(
			"Use wait-reply after a worker has marked a thread blocked and needs a leader response.",
			"This is the worker-side blocking primitive; prefer it over ad hoc sleep loops.",
			"Resume with --after-event or --after-message when you already know the last event or message you processed.",
			"wait-reply watches one thread, unlike watch which can observe broader inbox activity.",
		),
		Example: `  inbox --db .agents/coord.db wait-reply --thread thr_123
  inbox --db .agents/coord.db wait-reply --thread thr_123 --after-event 42 --timeout-seconds 900
  inbox --db .agents/coord.db wait-reply --thread thr_123 --kinds answer,result`,
		RunE: func(cmd *cobra.Command, args []string) error {
			ctx := cmd.Context()

			sqlDB, err := openInboxDB(ctx, root.dbPath)
			if err != nil {
				return err
			}
			defer sqlDB.Close()

			s := store.NewInboxStore(sqlDB)
			agent := root.agent
			result, err := s.WaitReply(ctx, store.WaitReplyInput{
				ThreadID:       opts.threadID,
				AfterMessageID: opts.afterMessageID,
				AfterEventID:   opts.afterEventID,
				Kinds:          parseCSV(opts.kinds),
				Agent:          agent,
				Timeout:        time.Duration(opts.timeoutSeconds) * time.Second,
			})
			if err != nil {
				return err
			}
			if !result.Woke {
				return protocol.NoMatchingWork("no matching reply before timeout")
			}

			data := map[string]any{
				"woke":          result.Woke,
				"next_event_id": result.NextEventID,
			}
			if result.Message != nil {
				data["message"] = result.Message
			}

			resp := protocol.Success{
				OK:      true,
				Command: "wait-reply",
				Data:    data,
			}

			if root.json {
				return protocol.WriteJSON(cmd.OutOrStdout(), resp)
			}

			_, err = fmt.Fprintf(cmd.OutOrStdout(), "reply received on thread %s at event %d\n", result.Message.ThreadID, result.NextEventID)
			return err
		},
	}

	cmd.Flags().StringVar(&opts.threadID, "thread", "", "Thread ID")
	cmd.Flags().StringVar(&opts.afterMessageID, "after-message", "", "Resume after a known message ID")
	cmd.Flags().Int64Var(&opts.afterEventID, "after-event", 0, "Resume after a known event ID")
	cmd.Flags().StringVar(&opts.kinds, "kinds", "answer,control,result", "Comma-separated message kinds to wake on")
	cmd.Flags().IntVar(&opts.timeoutSeconds, "timeout-seconds", 0, "Maximum time to wait; 0 waits forever")

	_ = cmd.MarkFlagRequired("thread")

	return cmd
}