package rpc

import "github.com/kaspanet/kaspad/rpc/model"

// handleWebsocketHelp implements the help command for websocket connections.
func handleWebsocketHelp(wsc *wsClient, icmd interface{}) (interface{}, error) {
	cmd, ok := icmd.(*model.HelpCmd)
	if !ok {
		return nil, model.ErrRPCInternal
	}

	// Provide a usage overview of all commands when no specific command
	// was specified.
	var command string
	if cmd.Command != nil {
		command = *cmd.Command
	}
	if command == "" {
		usage, err := wsc.server.helpCacher.rpcUsage(true)
		if err != nil {
			context := "Failed to generate RPC usage"
			return nil, internalRPCError(err.Error(), context)
		}
		return usage, nil
	}

	// Check that the command asked for is supported and implemented.
	// Search the list of websocket handlers as well as the main list of
	// handlers since help should only be provided for those cases.
	valid := true
	if _, ok := rpcHandlers[command]; !ok {
		if _, ok := wsHandlers[command]; !ok {
			valid = false
		}
	}
	if !valid {
		return nil, &model.RPCError{
			Code:    model.ErrRPCInvalidParameter,
			Message: "Unknown command: " + command,
		}
	}

	// Get the help for the command.
	help, err := wsc.server.helpCacher.rpcMethodHelp(command)
	if err != nil {
		context := "Failed to generate help"
		return nil, internalRPCError(err.Error(), context)
	}
	return help, nil
}