package stdlib

import "github.com/d5/tengo/objects"

// Modules contain the standard modules.
var Modules = map[string]*objects.Object{
	"math":  objectPtr(&objects.ImmutableMap{Value: mathModule}),
	"os":    objectPtr(&objects.ImmutableMap{Value: osModule}),
	"text":  objectPtr(&objects.ImmutableMap{Value: textModule}),
	"times": objectPtr(&objects.ImmutableMap{Value: timesModule}),
	"rand":  objectPtr(&objects.ImmutableMap{Value: randModule}),
}

// AllModuleNames returns a list of all default module names.
func AllModuleNames() []string {
	var names []string
	for name := range Modules {
		names = append(names, name)
	}
	return names
}

// GetModules returns the modules for the given names.
// Duplicate names and invalid names are ignore.
func GetModules(names ...string) map[string]*objects.ImmutableMap {
	modules := make(map[string]*objects.ImmutableMap)
	for _, name := range names {
		if mod := Modules[name]; mod != nil {
			modules[name] = (*mod).(*objects.ImmutableMap)
		}
	}
	return modules
}

func objectPtr(o objects.Object) *objects.Object {
	return &o
}