package handlers

import (
	"net/http"
	"strings"

	"galaxy/gamemaster/internal/domain/runtime"
)

// newListRuntimesHandler returns the handler for
// `GET /api/v1/internal/runtimes`. The optional `status` query
// parameter narrows the result; an unknown value short-circuits with
// `400 invalid_request`. Records are returned ordered by
// `created_at DESC` (the underlying store guarantees the ordering).
func newListRuntimesHandler(deps Dependencies) http.HandlerFunc {
	logger := loggerFor(deps.Logger, "internal_rest.list_runtimes")
	return func(writer http.ResponseWriter, request *http.Request) {
		if deps.RuntimeRecords == nil {
			writeError(writer, http.StatusInternalServerError, errorCodeInternal, "runtime records store is not wired")
			return
		}

		ctx := request.Context()

		raw := strings.TrimSpace(request.URL.Query().Get("status"))
		if raw == "" {
			records, err := deps.RuntimeRecords.List(ctx)
			if err != nil {
				logger.ErrorContext(ctx, "list runtime records failed", "err", err.Error())
				writeError(writer, http.StatusInternalServerError, errorCodeInternal, "failed to list runtime records")
				return
			}
			writeJSON(writer, http.StatusOK, encodeRuntimeList(records))
			return
		}

		status := runtime.Status(raw)
		if !status.IsKnown() {
			writeError(writer, http.StatusBadRequest, errorCodeInvalidRequest, "status query parameter is unsupported")
			return
		}

		records, err := deps.RuntimeRecords.ListByStatus(ctx, status)
		if err != nil {
			logger.ErrorContext(ctx, "list runtime records by status failed",
				"status", string(status),
				"err", err.Error(),
			)
			writeError(writer, http.StatusInternalServerError, errorCodeInternal, "failed to list runtime records")
			return
		}
		writeJSON(writer, http.StatusOK, encodeRuntimeList(records))
	}
}