package handlers

import (
	"net/http"
	"strings"

	"galaxy/gamemaster/internal/service/livenessreply"
)

// newGameLivenessHandler returns the handler for
// `GET /api/v1/internal/games/{game_id}/liveness`. The endpoint
// always responds with 200 + LivenessResponse; Go-level errors
// returned by the service map to 500 / 503 according to their
// embedded error code prefix.
func newGameLivenessHandler(deps Dependencies) http.HandlerFunc {
	logger := loggerFor(deps.Logger, "internal_rest.game_liveness")
	return func(writer http.ResponseWriter, request *http.Request) {
		if deps.GameLiveness == nil {
			writeError(writer, http.StatusInternalServerError, errorCodeInternal, "game liveness service is not wired")
			return
		}

		gameID, ok := extractGameID(writer, request)
		if !ok {
			return
		}

		result, err := deps.GameLiveness.Handle(request.Context(), livenessreply.Input{GameID: gameID})
		if err != nil {
			logger.ErrorContext(request.Context(), "game liveness service errored",
				"game_id", gameID,
				"err", err.Error(),
			)
			switch {
			case strings.HasPrefix(err.Error(), livenessreply.ErrorCodeInvalidRequest+":"):
				writeError(writer, http.StatusBadRequest, errorCodeInvalidRequest, err.Error())
			case strings.HasPrefix(err.Error(), livenessreply.ErrorCodeServiceUnavailable+":"):
				writeError(writer, http.StatusServiceUnavailable, errorCodeServiceUnavailable, "service unavailable")
			default:
				writeError(writer, http.StatusInternalServerError, errorCodeInternal, "game liveness service failed")
			}
			return
		}

		writeJSON(writer, http.StatusOK, livenessResponse{
			Ready:  result.Ready,
			Status: string(result.Status),
		})
	}
}