package port

import (
	"net/http"
	"strconv"

	"gitea.dwysokinski.me/twhelp/core/internal/domain"
	"gitea.dwysokinski.me/twhelp/core/internal/port/internal/apimodel"
)

const apiServerSnapshotSortMaxLength = 1

var apiServerSnapshotSortAllowedValues = []domain.ServerSnapshotSort{
	domain.ServerSnapshotSortDateASC,
	domain.ServerSnapshotSortDateDESC,
}

//nolint:gocyclo
func (h *apiHTTPHandler) ListServerServerSnapshots(
	w http.ResponseWriter,
	r *http.Request,
	_ apimodel.VersionCodePathParam,
	serverKey apimodel.ServerKeyPathParam,
	params apimodel.ListServerServerSnapshotsParams,
) {
	domainParams := domain.NewListServerSnapshotsParams()

	if err := domainParams.SetSort([]domain.ServerSnapshotSort{domain.ServerSnapshotSortIDASC}); err != nil {
		h.errorRenderer.withErrorPathFormatter(formatListServerSnapshotsErrorPath).render(w, r, err)
		return
	}

	if err := domainParams.SetServerKeys([]string{serverKey}); err != nil {
		h.errorRenderer.withErrorPathFormatter(formatListServerSnapshotsErrorPath).render(w, r, err)
		return
	}

	if params.Sort != nil {
		if err := domainParams.PrependSortString(
			*params.Sort,
			apiServerSnapshotSortAllowedValues,
			apiServerSnapshotSortMaxLength,
		); err != nil {
			h.errorRenderer.withErrorPathFormatter(formatListServerSnapshotsErrorPath).render(w, r, err)
			return
		}
	} else {
		if err := domainParams.PrependSort([]domain.ServerSnapshotSort{domain.ServerSnapshotSortDateASC}); err != nil {
			h.errorRenderer.withErrorPathFormatter(formatListServerSnapshotsErrorPath).render(w, r, err)
			return
		}
	}

	if params.Limit != nil {
		if err := domainParams.SetLimit(*params.Limit); err != nil {
			h.errorRenderer.withErrorPathFormatter(formatListServerSnapshotsErrorPath).render(w, r, err)
			return
		}
	}

	if params.Cursor != nil {
		if err := domainParams.SetEncodedCursor(*params.Cursor); err != nil {
			h.errorRenderer.withErrorPathFormatter(formatListServerSnapshotsErrorPath).render(w, r, err)
			return
		}
	}

	res, err := h.serverSnapshotSvc.ListWithRelations(r.Context(), domainParams)
	if err != nil {
		h.errorRenderer.render(w, r, err)
		return
	}

	renderJSON(w, r, http.StatusOK, apimodel.NewListServerSnapshotsResponse(res))
}

func formatListServerSnapshotsErrorPath(segments []domain.ErrorPathSegment) []string {
	if segments[0].Model != "ListServerSnapshotsParams" {
		return nil
	}

	switch segments[0].Field {
	case "cursor":
		return []string{"$query", "cursor"}
	case "limit":
		return []string{"$query", "limit"}
	case "sort":
		path := []string{"$query", "sort"}
		if segments[0].Index >= 0 {
			path = append(path, strconv.Itoa(segments[0].Index))
		}
		return path
	default:
		return nil
	}
}