/*
 * Micro Service
 * Package: gitlab.hexacode.org/go-libs/microservice
 * Maintainer: Azzis Arswendo <azzis@hexacode.org>
 *
 * Copyright (C) 2023 Hexacode Teknologi Indonesia
 * All Rights Reserved
 */

package config

import (
	"errors"
	"plugin"

	"gitlab.hexacode.org/go-libs/hctypes"
)

var (
	plugins map[string]*plugin.Plugin = map[string]*plugin.Plugin{}
)

type ConfigCallback struct {
	Plugin   string                                                     `json:"plugin,omitempty"`
	Function string                                                     `json:"function,omitempty"`
	plugin   *plugin.Plugin                                             `json:"-"`
	function func(*ConfigContext) (int, hctypes.Dict, *ReturnHTTPError) `json:"-"`
}

func (config *Config) LoadPlugin() error {
	apis := config.APIs
	if apis != nil {
		for _, api := range apis {
			for _, param := range api.Params {
				if param.Name == "" {
					panic(errors.New("api.params[].name is required"))
				}
			}
			callback := api.Callback

			if callback == nil {
				api.Callback = &ConfigCallback{
					function: DefaultCallbackAPIFunction,
				}
			} else {
				plg, err := plugin.Open(callback.Plugin)
				if err != nil {
					panic(err)
					return err
				}

				callback.plugin = plg
				function, err := plg.Lookup(callback.Function)
				if err != nil {
					panic(err)
					return err
				}
				callback.function = function.(func(*ConfigContext) (int, hctypes.Dict, *ReturnHTTPError))
			}
		}
	}

	templates := config.Templates
	if templates != nil {
		for _, template := range templates {
			callback := template.Callback

			if callback == nil {
				template.Callback = &ConfigTemplateCallback{
					function: DefaultCallbackTemplateFunction,
				}
			} else {
				plg, err := plugin.Open(callback.Plugin)
				if err != nil {
					panic(err)
					return err
				}

				callback.plugin = plg
				function, err := plg.Lookup(callback.Function)
				if err != nil {
					panic(err)
					return err
				}
				callback.function = function.(func(*ConfigTemplateContext) hctypes.Dict)
			}
		}
	}

	return nil
}