package otlptracehttp // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
import (
	"bytes"
	"compress/gzip"
	"context"
	"encoding/json"
	"fmt"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
	"io"
	"net/http"
	"net/url"
	"strconv"
)

func (d *client) UploadApmTraces(ctx context.Context, rootData []otlptrace.RootData) error {
	//pbRequest := &coltracepb.ExportTraceServiceRequest{
	//	ResourceSpans: protoSpans,
	//}
	rawRequest, err := json.Marshal(rootData)
	if err != nil {
		return err
	}

	ctx, cancel := d.contextWithStop(ctx)
	defer cancel()
	mapLen := len(rootData)
	request, err := d.newApmRequest(rawRequest, mapLen)
	if err != nil {
		return err
	}

	return d.requestFunc(ctx, func(ctx context.Context) error {
		select {
		case <-ctx.Done():
			return ctx.Err()
		default:
		}

		request.reset(ctx)
		resp, err := d.client.Do(request.Request)
		if err != nil {
			return err
		}

		if resp != nil && resp.Body != nil {
			defer func() {
				if err := resp.Body.Close(); err != nil {
					otel.Handle(err)
				}
			}()
		}

		switch sc := resp.StatusCode; {
		case sc >= 200 && sc <= 299:
			// Success, do not retry.
			// Read the partial success message, if any.
			var respData bytes.Buffer
			if _, err := io.Copy(&respData, resp.Body); err != nil {
				return err
			}

			if respData.Len() != 0 {
				var respJsonData RespDataT
				if err := json.Unmarshal(respData.Bytes(), &respJsonData); err != nil {
					return err
				}
				msg := respJsonData.Msg
				code := respJsonData.Code
				if msg != "send ok" || code != 1000 {
					return fmt.Errorf("resp error msg:<%s> code:<%d>", msg, code)
				}
			}
			return nil

		case sc == http.StatusTooManyRequests, sc == http.StatusServiceUnavailable:
			// Retry-able failures.  Drain the body to reuse the connection.
			if _, err := io.Copy(io.Discard, resp.Body); err != nil {
				otel.Handle(err)
			}
			return newResponseError(resp.Header)
		default:
			return fmt.Errorf("failed to send to %s: %s", request.URL, resp.Status)
		}
	})
}

type RespDataT struct {
	Code int    `json:"code"`
	Msg  string `json:"message"`
}

func (d *client) newApmRequest(body []byte, mapLen int) (request, error) {
	u := url.URL{Scheme: d.getScheme(), Host: d.cfg.Endpoint, Path: d.cfg.URLPath}
	r, err := http.NewRequest(http.MethodPost, u.String(), nil)
	if err != nil {
		return request{Request: r}, err
	}

	userAgent := "OTel OTLP Exporter Go/" + otlptrace.Version()
	r.Header.Set("User-Agent", userAgent)

	for k, v := range d.cfg.Headers {
		r.Header.Set(k, v)
	}

	//r.Header.Set("Content-Type", contentTypeProto)
	r.Header.Set("Content-Type", "text/plain;charset=utf-8")
	r.Header.Set("routingKey", "goTopic")
	r.Header.Set("DataCount", strconv.Itoa(mapLen))

	req := request{Request: r}
	switch Compression(d.cfg.Compression) {
	case NoCompression:
		r.ContentLength = (int64)(len(body))
		req.bodyReader = bodyReader(body)
	case GzipCompression:
		// Ensure the content length is not used.
		r.ContentLength = -1
		r.Header.Set("Content-Encoding", "gzip")

		gz := gzPool.Get().(*gzip.Writer)
		defer gzPool.Put(gz)

		var b bytes.Buffer
		gz.Reset(&b)

		if _, err := gz.Write(body); err != nil {
			return req, err
		}
		// Close needs to be called to ensure body if fully written.
		if err := gz.Close(); err != nil {
			return req, err
		}

		req.bodyReader = bodyReader(b.Bytes())
	}

	return req, nil
}