package handlers

import (
	"net/http"

	"galaxy/rtmanager/internal/domain/operation"
	"galaxy/rtmanager/internal/service/startruntime"
)

// startRequestBody mirrors the OpenAPI StartRequest schema. Only
// `image_ref` is accepted; unknown fields are rejected by
// decodeStrictJSON.
type startRequestBody struct {
	ImageRef string `json:"image_ref"`
}

// newStartHandler returns the handler for
// `POST /api/v1/internal/runtimes/{game_id}/start`. The handler
// delegates the entire lifecycle to `startruntime.Service`; failure
// codes are mapped to HTTP statuses via mapErrorCodeToStatus.
func newStartHandler(deps Dependencies) http.HandlerFunc {
	logger := loggerFor(deps.Logger, "internal_rest.start")
	return func(writer http.ResponseWriter, request *http.Request) {
		if deps.StartRuntime == nil {
			writeError(writer, http.StatusInternalServerError,
				startruntime.ErrorCodeInternal,
				"start runtime service is not wired",
			)
			return
		}

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

		var body startRequestBody
		if err := decodeStrictJSON(request.Body, &body); err != nil {
			writeError(writer, http.StatusBadRequest,
				startruntime.ErrorCodeInvalidRequest,
				err.Error(),
			)
			return
		}

		result, err := deps.StartRuntime.Handle(request.Context(), startruntime.Input{
			GameID:    gameID,
			ImageRef:  body.ImageRef,
			OpSource:  resolveOpSource(request),
			SourceRef: requestSourceRef(request),
		})
		if err != nil {
			logger.ErrorContext(request.Context(), "start runtime service errored",
				"game_id", gameID,
				"err", err.Error(),
			)
			writeError(writer, http.StatusInternalServerError,
				startruntime.ErrorCodeInternal,
				"start runtime service failed",
			)
			return
		}

		if result.Outcome == operation.OutcomeFailure {
			writeFailure(writer, result.ErrorCode, result.ErrorMessage)
			return
		}

		writeJSON(writer, http.StatusOK, encodeRuntimeRecord(result.Record))
	}
}