package interactiveoffers

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

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

type adapter struct {
	endpoint *template.Template
}

func (a *adapter) MakeRequests(request *openrtb2.BidRequest, requestInfo *adapters.ExtraRequestInfo) ([]*adapters.RequestData, []error) {
	var errors []error
	var bidderExt adapters.ExtImpBidder
	if err := jsonutil.Unmarshal(request.Imp[0].Ext, &bidderExt); err != nil {
		errors = append(errors, &errortypes.BadInput{
			Message: err.Error(),
		})
		return nil, errors
	}
	var ioExt *openrtb_ext.ExtImpInteractiveoffers
	if err := jsonutil.Unmarshal(bidderExt.Bidder, &ioExt); err != nil {
		errors = append(errors, &errortypes.BadInput{
			Message: err.Error(),
		})
		return nil, errors
	}
	requestJSON, err := json.Marshal(request)
	if err != nil {
		return nil, []error{err}
	}

	url, err := a.buildEndpointURL(ioExt)
	if err != nil {
		return nil, []error{err}
	}
	headers := http.Header{}
	headers.Add("Content-Type", "application/json;charset=utf-8")
	headers.Add("Accept", "application/json")
	requestData := &adapters.RequestData{
		Method:  "POST",
		Uri:     url,
		Body:    requestJSON,
		Headers: headers,
		ImpIDs:  openrtb_ext.GetImpIDs(request.Imp),
	}
	return []*adapters.RequestData{requestData}, nil
}

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.StatusBadRequest {
		err := &errortypes.BadInput{
			Message: "Unexpected status code: 400. Bad request from publisher. Run with request.debug = 1 for more info.",
		}
		return nil, []error{err}
	}

	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 _, bid := range seatBid.Bid {
			bid := bid // pin https://github.com/kyoh86/scopelint#whats-this
			b := &adapters.TypedBid{
				Bid:     &bid,
				BidType: openrtb_ext.BidTypeBanner,
			}
			bidResponse.Bids = append(bidResponse.Bids, b)
		}
	}
	return bidResponse, nil
}

// Builder builds a new instance of the Interactiveoffers adapter for the given bidder with the given config.
func Builder(bidderName openrtb_ext.BidderName, config config.Adapter, server config.Server) (adapters.Bidder, error) {
	template, err := template.New("endpointTemplate").Parse(config.Endpoint)
	if err != nil {
		return nil, fmt.Errorf("unable to parse endpoint url template: %v", err)
	}
	bidder := &adapter{
		endpoint: template,
	}
	return bidder, nil
}

func (a *adapter) buildEndpointURL(params *openrtb_ext.ExtImpInteractiveoffers) (string, error) {
	endpointParams := macros.EndpointTemplateParams{AccountID: params.PartnerId}
	return macros.ResolveMacros(a.endpoint, endpointParams)
}