/*
Copyright © 2026 Thomas von Dein

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cfg

import (
	"bytes"
	"crypto/tls"
	"encoding/json"
	"fmt"
	"log/slog"
	"net/http"

	"github.com/elastic/elastic-transport-go/v8/elastictransport"
)

// used to print uri, path and body of a request made by the go-client
type DebugTransport struct {
	Transport http.RoundTripper
}

func (t *DebugTransport) RoundTrip(req *http.Request) (*http.Response, error) {
	content := ""
	contentline := ""

	if req.ContentLength > 0 {
		buf := new(bytes.Buffer)
		body, _ := req.GetBody()

		_, err := buf.ReadFrom(body)
		if err != nil {
			return nil, err
		}

		var pretty bytes.Buffer
		err = json.Indent(&pretty, buf.Bytes(), "", "\t")
		if err != nil {
			return nil, fmt.Errorf("json parse error: %s", err)
		}

		content = pretty.String()
		contentline = buf.String()
	}

	slog.Info("req", "host", req.URL.Host, "uri", req.URL.Path,
		"body", content, "bodyline", contentline,
		"headers", req.Header,
	)

	return t.Transport.RoundTrip(req)
}

func (conf *Config) getTransport() elastictransport.Option {
	transport := &http.Transport{
		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
	}

	if conf.DebugHTTP {
		return elastictransport.WithTransport(
			&DebugTransport{Transport: transport},
		)
	}

	return elastictransport.WithTransport(transport)
}