package djax

import (
	"encoding/json"
	"fmt"
	"net/http"

	"github.com/prebid/openrtb/v20/openrtb2"
	"github.com/prebid/prebid-server/v3/adapters"

	"github.com/prebid/prebid-server/v3/openrtb_ext"
)

type adapter struct {
	endpoint string
}

// Builder required for Prebid Server to build the adapter


// MakeRequests sends the OpenRTB request to the bidder endpoint
func (a *adapter) MakeRequests(req *openrtb2.BidRequest, reqInfo *adapters.ExtraRequestInfo) ([]*adapters.RequestData, []error) {
	body, err := json.Marshal(req)
	if err != nil {
		return nil, []error{fmt.Errorf("djax: failed to marshal request: %v", err)}
	}

	return []*adapters.RequestData{{
		Method:  "POST",
		Uri:     a.endpoint,
		Body:    body,
		Headers: http.Header{"Content-Type": []string{"application/json"}},
	}}, nil
}

// MakeBids parses the response and returns bids
func (a *adapter) MakeBids(req *openrtb2.BidRequest, reqData *adapters.RequestData, respData *adapters.ResponseData) (*adapters.BidderResponse, []error) {
	var bidResp openrtb2.BidResponse
	if err := json.Unmarshal(respData.Body, &bidResp); err != nil {
		return nil, []error{fmt.Errorf("djax: failed to unmarshal bid response: %v", err)}
	}

	br := adapters.NewBidderResponse()
	for _, seatBid := range bidResp.SeatBid {
		for _, bid := range seatBid.Bid {
			bidType := openrtb_ext.BidTypeBanner
			for _, imp := range req.Imp {
				if imp.ID == bid.ImpID {
					if imp.Native != nil {
						bidType = openrtb_ext.BidTypeNative
					} else if imp.Video != nil {
						bidType = openrtb_ext.BidTypeVideo
					}
					break
				}
			}

			br.Bids = append(br.Bids, &adapters.TypedBid{
				Bid:     &bid,
				BidType: bidType,
			})
		}
	}
	br.Currency = bidResp.Cur
	return br, nil
}