package iqzone

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 {
	endpoint string
}

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, reqInfo *adapters.ExtraRequestInfo) ([]*adapters.RequestData, []error) {
	var errs []error
	var err error
	var adapterRequests []*adapters.RequestData

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

		var bidderExt adapters.ExtImpBidder
		var iqzoneExt openrtb_ext.ImpExtIQZone

		if err = jsonutil.Unmarshal(reqCopy.Imp[0].Ext, &bidderExt); err != nil {
			return nil, append(errs, err)
		}
		if err = jsonutil.Unmarshal(bidderExt.Bidder, &iqzoneExt); err != nil {
			return nil, append(errs, err)
		}

		finalyImpExt := reqCopy.Imp[0].Ext
		if iqzoneExt.PlacementID != "" {
			finalyImpExt, _ = json.Marshal(map[string]interface{}{
				"bidder": map[string]interface{}{
					"placementId": iqzoneExt.PlacementID,
					"type":        "publisher",
				},
			})
		} else if iqzoneExt.EndpointID != "" {
			finalyImpExt, _ = json.Marshal(map[string]interface{}{
				"bidder": map[string]interface{}{
					"endpointId": iqzoneExt.EndpointID,
					"type":       "network",
				},
			})
		}

		reqCopy.Imp[0].Ext = finalyImpExt

		adapterReq, errors := a.makeRequest(&reqCopy)
		if adapterReq != nil {
			adapterRequests = append(adapterRequests, adapterReq)
		}
		errs = append(errs, errors...)
	}
	return adapterRequests, errs
}

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

	reqJSON, err := json.Marshal(request)
	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")
	return &adapters.RequestData{
		Method:  "POST",
		Uri:     a.endpoint,
		Body:    reqJSON,
		Headers: headers,
		ImpIDs:  openrtb_ext.GetImpIDs(request.Imp),
	}, errs
}

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

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

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

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

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

func getBidMediaType(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
	default:
		return "", fmt.Errorf("Unable to fetch mediaType in multi-format: %s", bid.ImpID)
	}
}