package console

import (
	"fmt"
	"net/http"

	"github.com/carlosframework/platform/internal/release"
)

// The ship door's swap-demand sentences live here, not in apicli.go: the
// moves copy gate pins the jsonError text of that file.
const (
	apiShipSwapBad      = `swap must be "hold" or left out`
	apiShipSwapConflict = "version %s was already shipped with a different swap demand. Versions are immutable: ship under a new version"
)

// refuseBadSwap answers 400 and reports true when the meta part carries a
// swap demand other than "hold" (zero-downtime spec §4.2).
func refuseBadSwap(w http.ResponseWriter, swap string) bool {
	if swap != "" && swap != release.DemandHold {
		jsonError(w, http.StatusBadRequest, apiShipSwapBad)
		return true
	}
	return false
}

// refuseSwapConflict answers 409 and reports true when a re-ship of an
// existing version adds or drops the demand. The demand decides how the bytes
// are swapped in, so such a re-ship is a different release: the capability
// block's rule.
func refuseSwapConflict(w http.ResponseWriter, stored, sent, ver string) bool {
	if stored != sent {
		jsonError(w, http.StatusConflict, fmt.Sprintf(apiShipSwapConflict, ver))
		return true
	}
	return false
}

// addSwapEcho adds the release's own swap demand to a ship response
// (zero-downtime spec §4.2), closing the gap addCapabilitiesEcho closes: a
// console from before the field ignores it and stores a release that demands
// nothing, which would swap in overlap; a client that sent a demand refuses
// an answer without its echo.
func addSwapEcho(body map[string]any, swap string) {
	if swap != "" {
		body["swap"] = swap
	}
}