package sdk

import (

	"fmt"

	"github.com/envoyproxy/envoy/source/extensions/dynamic_modules/sdk/go/shared"

)

// For built-in plugin factories in the host binary directly. DO NOT use this for independently

// compiled module or plugins.

var httpFilterConfigFactoryRegistry = make(map[string]shared.HttpFilterConfigFactory)

// NewHttpFilterFactory creates a new plugin factory for the given plugin name and unparsed config.

func NewHttpFilterFactory(handle shared.HttpFilterConfigHandle, name string,

	unparsedConfig []byte) (shared.HttpFilterFactory, error) {

	configFactory := httpFilterConfigFactoryRegistry[name]

	if configFactory == nil {

		return nil, fmt.Errorf("failed to get plugin config factory")

	}

	return configFactory.Create(handle, unparsedConfig)

}

// GetHttpFilterConfigFactory gets the plugin config factory for the given plugin name.

func GetHttpFilterConfigFactory(name string) shared.HttpFilterConfigFactory {

	return httpFilterConfigFactoryRegistry[name]

}

// RegisterHttpFilterConfigFactories registers plugin config factories for plugins in the composer

// binary itself. This function MUST only be called from init() functions.

func RegisterHttpFilterConfigFactories(factories map[string]shared.HttpFilterConfigFactory) {

	for name, factory := range factories {

		if _, ok := httpFilterConfigFactoryRegistry[name]; ok {

			// Same plugin name should only be register once in same lib.

			panic("plugin config factory already registered: " + name)

		}

		httpFilterConfigFactoryRegistry[name] = factory

	}

}