// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
// All rights reserved.

// builtin-os-file.go
package expr

import (
	"git.portale-stac.it/go-pkg/expr/file"
	"git.portale-stac.it/go-pkg/expr/kern"
)

const paramHandleOrPath = "handle-or-path"

func initFileHandle(ctx kern.ExprContext, name string, args map[string]any) (handle *file.Reader, invalidFileHandle any, autoClose bool, err error) {
	var ok bool

	if handle, ok = args[paramHandleOrPath].(*file.Reader); !ok {
		if fileName, ok := args[paramHandleOrPath].(string); ok && len(fileName) > 0 {
			var handleAny any
			if handleAny, err = openFileFunc(ctx, name, map[string]any{kern.ParamFilepath: fileName}); err != nil {
				return
			}
			if handleAny != nil {
				handle = handleAny.(*file.Reader)
				autoClose = true
			}
		} else {
			invalidFileHandle = args[paramHandleOrPath]
		}
	}
	return
}