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: modRespGlblHdrLoad, beforeRespond: modRespGlblHdr})
}

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

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

	log.Debugf("mod_response_headers_global config len(set) %+v len(drop) %+v\n", cfg.Set, cfg.Drop)
	if !cfg.Any() {
		return
	}
	*d.Hdr = web.CopyHeader(*d.Hdr)
	cfg.Mod(*d.Hdr)
}