package main

import (
	"fmt"
	"os"
	"os/signal"
	"syscall"

	"github.com/langgenius/dify/dify-agent-runtime/internal/agentcli"
	"github.com/spf13/cobra"
)

func newKnowledgeCommand() *cobra.Command {
	var protocolVersion bool
	root := &cobra.Command{Use: "knowledge", Short: "Autonomously inspect read-only KnowledgeFS evidence. All results are JSON.",
		RunE: func(cmd *cobra.Command, args []string) error {
			if protocolVersion {
				_, err := fmt.Fprintln(cmd.OutOrStdout(), "1")
				return err
			}
			return cmd.Help()
		}, Args: cobra.NoArgs}
	root.Flags().BoolVar(&protocolVersion, "protocol-version", false, "Print the locally supported knowledge protocol version.")
	definitions := []struct {
		name, description string
		flags             []string
	}{
		{"spaces", "List only spaces bound to this Agent and their current availability.", nil},
		{"capabilities", "Inspect this space's current capabilities (no model credentials).", []string{"space"}},
		{"search", "Retrieve evidence using the space profile; no nested planner or generated answer.", []string{"space", "query", "image-file-id", "limit"}},
		{"ls", "List a bounded page of /knowledge entries.", []string{"space", "path", "cursor", "limit"}},
		{"tree", "Browse a bounded /knowledge subtree.", []string{"space", "path", "cursor", "limit", "depth"}},
		{"find", "Find /knowledge entries whose names contain the query.", []string{"space", "path", "query", "cursor", "limit"}},
		{"grep", "Search text inside /knowledge with a bounded server timeout.", []string{"space", "path", "query", "cursor", "limit"}},
		{"cat", "Read a page of text. Raw manifests and binary artifacts are not exposed.", []string{"space", "path", "cursor", "limit"}},
		{"stat", "Inspect safe metadata for one /knowledge path.", []string{"space", "path"}},
		{"diff", "Compare two readable paths without an LLM semantic-diff call.", []string{"space", "old-path", "new-path"}},
		{"open", "Open a node ID or validate/reopen a trusted evidence receipt.", []string{"space", "node-id", "receipt"}},
		{"images", "List image items and captions from a receipt's immutable document artifact.", []string{"space", "receipt", "cursor", "limit"}},
		{"image", "Deliver one bounded image to a vision-capable Agent via the trusted runtime channel.", []string{"space", "receipt", "item-id"}},
	}
	for _, definition := range definitions {
		cmd := &cobra.Command{Use: definition.name, Short: definition.description, Args: cobra.NoArgs}
		cmd.Flags().String("command-id", "", "Logical UUID for this command; generated by default. Reusing it will not repeat retrieval.")
		cmd.Flags().Bool("json", true, "Emit complete JSON (always enabled).")
		for _, flag := range definition.flags {
			switch flag {
			case "limit":
				cmd.Flags().Int(flag, 10, "Maximum returned items/segments (1–50); retrieval depth still belongs to the space profile.")
			case "depth":
				cmd.Flags().Int(flag, 2, "Maximum tree depth (1–4).")
			case "path":
				cmd.Flags().String(flag, "/knowledge", "Canonical read-only /knowledge path.")
			case "image-file-id":
				cmd.Flags().StringArray(flag, nil, "Authorized upload UUID or local_file dify-file-ref from inputs; repeat at most four times, never a URL.")
			default:
				cmd.Flags().String(flag, "", "Knowledge command "+flag+".")
			}
		}
		cmd.RunE = func(cmd *cobra.Command, args []string) error {
			env, err := agentcli.ReadEnvironment()
			if err != nil {
				return err
			}
			id, _ := cmd.Flags().GetString("command-id")
			if id == "" {
				id, err = agentcli.NewKnowledgeCommandID()
				if err != nil {
					return err
				}
			}
			payload := map[string]any{"version": 1, "command": cmd.Name(), "command_id": id}
			keys := map[string]string{"space": "space", "query": "query", "path": "path", "cursor": "cursor",
				"old-path": "old_path", "new-path": "new_path", "node-id": "node_id", "receipt": "receipt_id", "item-id": "item_id"}
			for flag, key := range keys {
				if cmd.Flags().Lookup(flag) != nil {
					value, _ := cmd.Flags().GetString(flag)
					if value != "" {
						payload[key] = value
					}
				}
			}
			for _, flag := range []string{"limit", "depth"} {
				if cmd.Flags().Lookup(flag) != nil {
					value, _ := cmd.Flags().GetInt(flag)
					payload[flag] = value
				}
			}
			if cmd.Flags().Lookup("image-file-id") != nil {
				images, _ := cmd.Flags().GetStringArray("image-file-id")
				if len(images) > 4 {
					return fmt.Errorf("knowledge search accepts at most four query images")
				}
				for index, value := range images {
					images[index], err = agentcli.KnowledgeQueryImageID(value)
					if err != nil {
						return err
					}
				}
				if len(images) > 0 {
					payload["image_file_ids"] = images
				}
			}
			ctx, stop := signal.NotifyContext(cmd.Context(), os.Interrupt, syscall.SIGTERM)
			defer stop()
			return agentcli.RunKnowledge(ctx, env, payload, cmd.OutOrStdout())
		}
		root.AddCommand(cmd)
	}
	return root
}