package zentotem

import (
	"encoding/json"
	"fmt"
	"github.com/prebid/openrtb/v20/openrtb2"
	"github.com/prebid/prebid-server/v4/adapters"
	"github.com/prebid/prebid-server/v4/config"
	"github.com/prebid/prebid-server/v4/openrtb_ext"
)

type adapter struct {
	endpoint string
}

// Builder builds a new instance of the Zentotem adapter for the given bidder with the given config.
func Builder(bidderName openrtb_ext.BidderName, config config.Adapter, server config.Server) (adapters.Bidder, error) {
	bidder := &adapter{
		endpoint: config.Endpoint,
	}
	return bidder, nil
}

func (a *adapter) MakeRequests(request *openrtb2.BidRequest, requestInfo *adapters.ExtraRequestInfo) ([]*adapters.RequestData, []error) {
	requests := make([]*adapters.RequestData, 0, len(request.Imp))
	var errors []error

	requestCopy := *request
	for _, imp := range request.Imp {
		requestCopy.Imp = []openrtb2.Imp{imp}

		requestJSON, err := json.Marshal(request)
		if err != nil {
			errors = append(errors, err)
			continue
		}

		requestData := &adapters.RequestData{
			Method: "POST",
			Uri:    a.endpoint,
			Body:   requestJSON,
			ImpIDs: []string{imp.ID},
		}
		requests = append(requests, requestData)
	}
	return requests, errors
}

func getMediaTypeForBid(bid openrtb2.Bid) (openrtb_ext.BidType, error) {
	switch bid.MType {
	case openrtb2.MarkupBanner:
		return openrtb_ext.BidTypeBanner, nil
	case openrtb2.MarkupVideo:
		return openrtb_ext.BidTypeVideo, nil
	case openrtb2.MarkupNative:
		return openrtb_ext.BidTypeNative, nil
	}

	return "", fmt.Errorf("could not define media type for impression: %s", bid.ImpID)
}

func (a *adapter) MakeBids(request *openrtb2.BidRequest, requestData *adapters.RequestData, responseData *adapters.ResponseData) (*adapters.BidderResponse, []error) {
	if adapters.IsResponseStatusCodeNoContent(responseData) {
		return nil, nil
	}

	if err := adapters.CheckResponseStatusCodeForErrors(responseData); err != nil {
		return nil, []error{err}
	}
	var response openrtb2.BidResponse
	if err := json.Unmarshal(responseData.Body, &response); err != nil {
		return nil, []error{err}
	}

	bidResponse := adapters.NewBidderResponseWithBidsCapacity(len(request.Imp))
	bidResponse.Currency = response.Cur
	var errors []error
	for _, seatBid := range response.SeatBid {
		for i := range seatBid.Bid {
			bidType, err := getMediaTypeForBid(seatBid.Bid[i])
			if err != nil {
				errors = append(errors, err)
				continue
			}

			bidResponse.Bids = append(bidResponse.Bids, &adapters.TypedBid{
				Bid:     &seatBid.Bid[i],
				BidType: bidType,
			})
		}
	}
	return bidResponse, errors
}