package coinzilla

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

	"github.com/prebid/openrtb/v20/openrtb2"
	"github.com/prebid/prebid-server/v4/config"
	"github.com/prebid/prebid-server/v4/openrtb_ext"

	"github.com/prebid/prebid-server/v4/adapters"
	"github.com/prebid/prebid-server/v4/errortypes"
	"github.com/prebid/prebid-server/v4/util/jsonutil"
)

func Builder(bidderName openrtb_ext.BidderName, config config.Adapter, server config.Server) (adapters.Bidder, error) {
	bidder := &adapter{
		endpoint: config.Endpoint,
	}
	return bidder, nil
}

type adapter struct {
	endpoint string
}

func (adapter *adapter) MakeRequests(openRTBRequest *openrtb2.BidRequest, reqInfo *adapters.ExtraRequestInfo) (requestsToBidder []*adapters.RequestData, errs []error) {
	if len(openRTBRequest.Imp) == 0 {
		return nil, []error{&errortypes.BadInput{
			Message: "No impression in the bid request",
		}}
	}
	openRTBRequestJSON, err := json.Marshal(openRTBRequest)
	if err != nil {
		errs = append(errs, err)
		return nil, errs
	}

	headers := http.Header{}
	headers.Add("Content-Type", "application/json;charset=utf-8")
	headers.Add("Accept", "application/json")
	headers.Add("x-openrtb-version", "2.5")

	requestToBidder := &adapters.RequestData{
		Method:  "POST",
		Uri:     adapter.endpoint,
		Body:    openRTBRequestJSON,
		Headers: headers,
		ImpIDs:  openrtb_ext.GetImpIDs(openRTBRequest.Imp),
	}
	requestsToBidder = append(requestsToBidder, requestToBidder)

	return requestsToBidder, errs
}

func (adapter *adapter) MakeBids(openRTBRequest *openrtb2.BidRequest, requestToBidder *adapters.RequestData, bidderRawResponse *adapters.ResponseData) (bidderResponse *adapters.BidderResponse, errs []error) {
	switch bidderRawResponse.StatusCode {
	case http.StatusOK:
		break
	case http.StatusNoContent:
		return nil, nil
	default:
		err := &errortypes.BadServerResponse{
			Message: fmt.Sprintf("Unexpected code: %d. Run with request.debug = 1", bidderRawResponse.StatusCode),
		}
		return nil, []error{err}
	}

	var openRTBBidderResponse openrtb2.BidResponse
	if err := jsonutil.Unmarshal(bidderRawResponse.Body, &openRTBBidderResponse); err != nil {
		return nil, []error{err}
	}

	bidsCapacity := len(openRTBBidderResponse.SeatBid[0].Bid)
	bidderResponse = adapters.NewBidderResponseWithBidsCapacity(bidsCapacity)
	bidderResponse.Currency = openRTBBidderResponse.Cur
	var typedBid *adapters.TypedBid
	for _, seatBid := range openRTBBidderResponse.SeatBid {
		for i := range seatBid.Bid {
			typedBid = &adapters.TypedBid{Bid: &seatBid.Bid[i], BidType: "banner"}
			bidderResponse.Bids = append(bidderResponse.Bids, typedBid)
		}
	}

	return bidderResponse, nil
}