type Module interface {
	CallI32_I32(ctx context.Context, funcName string, param uint32) (uint32, error)
	CallI32I32_V(ctx context.Context, funcName string, x, y uint32) error
	CallI32_V(ctx context.Context, funcName string, param uint32) error
	CallV_V(ctx context.Context, funcName string) error
	CallI64_I64(ctx context.Context, funcName string, param uint64) (uint64, error)
	WriteMemory(offset uint32, bytes []byte) error
	Memory() []byte
	Close(context.Context) error
}

type Runtime interface {
	Name() string
	Compile(context.Context, *RuntimeConfig) error
	Instantiate(context.Context, *RuntimeConfig) (Module, error)
	Close(context.Context) error
}

type RuntimeConfig struct {
	Name              string
	ModuleName        string
	ModuleWasm        []byte
	FuncNames         []string
	NeedsWASI         bool
	NeedsMemoryExport bool
	// LogFn requires the implementation to export a function "env.log" which accepts i32i32_v.
	// The implementation invoke this with a byte slice allocated from the offset, length pair.
	// This function simulates a host function that logs a message.
	LogFn func([]byte) error
	// EnvFReturnValue is set to non-zero if we want the runtime to instantiate "env" module with the function "f"
	// which accepts one i64 value and returns the EnvFReturnValue as i64. This is mutually exclusive to LogFn.
	EnvFReturnValue uint64
}