// Package cli implements command dispatch and the agent JSON envelope.
package cli

import (
	"encoding/json"
	"io"
)

const (
	CodeConfig   = "config"
	CodeDB       = "db"
	CodeNetwork  = "network"
	CodeAuth     = "auth"
	CodePolicy   = "policy"
	CodeNotFound = "not_found"
	CodeUsage    = "usage"
)

// Envelope is the single JSON object every agent command emits.
type Envelope struct {
	Error       bool           `json:"error"`
	ErrorDetail map[string]any `json:"error_detail"`
	Data        any            `json:"data"`
}

func Success(data any) Envelope {
	if data == nil {
		data = map[string]any{}
	}
	return Envelope{Error: false, ErrorDetail: map[string]any{}, Data: data}
}

func Failure(code, message string) Envelope {
	return Envelope{
		Error:       true,
		ErrorDetail: map[string]any{"code": code, "message": message},
		Data:        map[string]any{},
	}
}

func (e Envelope) Write(w io.Writer) error {
	b, err := json.Marshal(e)
	if err != nil {
		return err
	}
	b = append(b, '\n')
	_, err = w.Write(b)
	return err
}