package plugin

/*
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

import (
	"encoding/json"

	"github.com/apache/trafficcontrol/grove/web"

	"github.com/apache/trafficcontrol/lib/go-log"
)

func init() {
	AddPlugin(10000, Funcs{load: modOrgReqHdrLoad, beforeParentRequest: modOrgReqHdr})
}

func modOrgReqHdrLoad(b json.RawMessage) interface{} {
	cfg := web.ModHdrs{}
	err := json.Unmarshal(b, &cfg)
	if err != nil {
		log.Errorln("modify_parent_request_headers loading config, unmarshalling JSON: " + err.Error())
		return nil
	}
	log.Debugf("modify_parent_request_headers load success: %+v\n", cfg)
	return &cfg
}

func modOrgReqHdr(icfg interface{}, d BeforeParentRequestData) {
	log.Debugf("modify_parent_request_headers calling\n")
	if icfg == nil {
		log.Debugln("modify_parent_request_headers has no config, returning.")
		return
	}
	cfg, ok := icfg.(*web.ModHdrs)
	if !ok {
		// should never happen
		log.Errorf("modify_parent_request_headers config '%v' type '%T' expected *ModHdrs\n", icfg, icfg)
		return
	}

	log.Debugf("modify_parent_request_headers config len(set) %+v len(drop) %+v\n", cfg.Set, cfg.Drop)
	if !cfg.Any() {
		return
	}
	cfg.Mod(d.Req.Header)
}