/*
 * Copyright 2026 Oleg Borodin <onborodin@gmail.com>
 */
package servcli

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"

	"mproxy/app/handler"
	"mproxy/app/servoper"
)

func (cli *Client) GetHello(ctx context.Context, rawpath string) (servoper.GetHelloResult, error) {
	var err error

	req := servoper.GetHelloParams{}
	res := servoper.GetHelloResult{}
	reqdata, err := json.Marshal(req)
	if err != nil {
		return res, err
	}
	resdata, err := cli.DoCall(ctx, rawpath, reqdata)
	if err != nil {
		return res, err
	}
	response := handler.NewResponse[servoper.GetHelloResult]()
	err = json.Unmarshal(resdata, &response)
	if err != nil {
		return res, err
	}
	res = response.Result
	return res, err
}

func (cli *Client) DoCall(ctx context.Context, rawpath string, reqdata []byte) ([]byte, error) {
	var err error
	res := make([]byte, 0)

	ref, err := ParsePath(rawpath)
	if err != nil {
		return res, err
	}
	uri := ref.HelloEP()
	reader := bytes.NewReader(reqdata)
	req, err := http.NewRequestWithContext(ctx, http.MethodPost, uri, reader)
	if err != nil {
		return res, err
	}
	req.Header.Set("User-Agent", cli.userAgent)
	req.Header.Set("Accept", "application/json")
	resp, err := cli.httpClient.Do(req)
	if err != nil {
		return res, err
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusNotFound {
		return res, err
	}
	if resp.StatusCode != http.StatusOK {
		err := fmt.Errorf("Unexpected response code %s", resp.Status)
		return res, err
	}
	contentLength := resp.Header.Get("Content-Length")
	if contentLength == "" {
		err := fmt.Errorf("Content-Length header is missing")
		return res, err
	}
	blobSize, err := strconv.ParseInt(contentLength, 10, 64)
	if err != nil {
		return res, err
	}
	buffer := bytes.NewBuffer(nil)
	recSize, err := Copy(ctx, buffer, resp.Body)
	if blobSize != recSize {
		err := fmt.Errorf("Mismatch declared and actual body size: %d and %d", blobSize, recSize)
		return res, err
	}
	res = buffer.Bytes()
	return res, err
}