package smilewanted

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

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

type adapter struct {
	URI string
}

func (a *adapter) MakeRequests(request *openrtb2.BidRequest, reqInfo *adapters.ExtraRequestInfo) ([]*adapters.RequestData, []error) {
	var errs []error

	// Extract zoneId from the first impression if available
	var zoneId string
	if len(request.Imp) > 0 {
		// Parse imp.ext
		var bidderExt adapters.ExtImpBidder
		if err := jsonutil.Unmarshal(request.Imp[0].Ext, &bidderExt); err == nil {
			// Parse bidderExt.Bidder to get zoneId
			var smilewantedExt openrtb_ext.ExtImpSmilewanted
			if err := jsonutil.Unmarshal(bidderExt.Bidder, &smilewantedExt); err == nil {
				zoneId = smilewantedExt.ZoneId
			}
		}
	}

	// Build the endpoint URL with zoneId
	endpoint := a.URI
	if zoneId != "" {
		endpoint = a.URI + zoneId
	}

	request.AT = 1 //Defaulting to first price auction for all prebid requests

	reqJSON, err := json.Marshal(request)
	if err != nil {
		return nil, []error{&errortypes.BadInput{
			Message: fmt.Sprintf("Json not encoded. err: %s", err),
		}}
	}

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

	return []*adapters.RequestData{{
		Method:  "POST",
		Uri:     endpoint,
		Body:    reqJSON,
		Headers: headers,
		ImpIDs:  openrtb_ext.GetImpIDs(request.Imp),
	}}, errs
}

func (a *adapter) MakeBids(internalRequest *openrtb2.BidRequest, externalRequest *adapters.RequestData, response *adapters.ResponseData) (*adapters.BidderResponse, []error) {

	if response.StatusCode == http.StatusNoContent {
		return nil, nil
	}

	if response.StatusCode == http.StatusBadRequest {
		return nil, []error{&errortypes.BadInput{
			Message: fmt.Sprintf("Unexpected status code: %d.", response.StatusCode),
		}}
	}

	if response.StatusCode != http.StatusOK {
		return nil, []error{&errortypes.BadServerResponse{
			Message: fmt.Sprintf("Unexpected status code: %d. Run with request.debug = 1 for more info.", response.StatusCode),
		}}
	}

	var bidResp openrtb2.BidResponse
	if err := jsonutil.Unmarshal(response.Body, &bidResp); err != nil {
		return nil, []error{&errortypes.BadServerResponse{
			Message: fmt.Sprintf("Bad server response: %s.", err),
		}}
	}

	var bidReq openrtb2.BidRequest
	if err := jsonutil.Unmarshal(externalRequest.Body, &bidReq); err != nil {
		return nil, []error{err}
	}

	bidResponse := adapters.NewBidderResponseWithBidsCapacity(len(bidResp.SeatBid[0].Bid))
	sb := bidResp.SeatBid[0]
	for i := 0; i < len(sb.Bid); i++ {
		bid := sb.Bid[i]
		bidResponse.Bids = append(bidResponse.Bids, &adapters.TypedBid{
			Bid:     &bid,
			BidType: getMediaTypeForImp(bid.ImpID, internalRequest.Imp),
		})
	}
	return bidResponse, nil
}

// getMediaTypeForImp figures out which media type this bid is for.
func getMediaTypeForImp(impId string, imps []openrtb2.Imp) openrtb_ext.BidType {
	mediaType := openrtb_ext.BidTypeBanner //default type
	for _, imp := range imps {
		if imp.ID == impId {
			if imp.Video != nil {
				mediaType = openrtb_ext.BidTypeVideo
			}
			return mediaType
		}
	}
	return mediaType
}

// Builder builds a new instance of the SmileWanted 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{
		URI: config.Endpoint,
	}
	return bidder, nil
}