//
// TODO(turnidge): Finish writing an idl description of the service protocol.
//

interface Service {
  // Returns the list of breakpoints for an isolate.
  getBreakpoints(isolateId string) BreakpointList

  // Adds a breakpoint at the specified line.
  //
  // TODO(turnidge): Make line an int instead of a string.
  addBreakpoint(isolateId string,
                scriptId string,
                line string) Breakpoint

  // Removes the specified breakpoint
  removeBreakpoint(isolateId string, breakpointId string) Response

  // Requests that an isolate pause execution.
  pause(isolateId string) Response

  // Requests that an isolate resume execution.
  //
  // <code>step</code> is optional and indicates whether execution
  // should single-step.
  resume(isolateId string, step StepOption) Response

  // Evaluate an expression in the context of some target.
  eval(isolateId string, targetId string, expression string) InstanceRef

  // Returns the current execution stack for an isolate.
  getStack(isolateId string) Stack

  // Returns code coverage information for a library, script, class,
  // or function.
  getCoverage(isolateId string, targetId string) CodeCoverage

  // Returns a full cpu profile for an isolate.
  //
  // <code>tagSelector</code> is optional with default 'UserVM'.
  getCpuProfile(isolateId string, tags TagSelector) CpuProfile


  // Returns a simple tag-based profile for an isolate.
  getTagProfile(isolateId string) TagProfile

  // Returns an allocation profile for an isolate.
  //
  // <code>reset</code> is optional and indicates whether allocation
  // accumulators should be reset.
  //
  // <code>gc</code> is optional and indicates whether a full
  getAllocationProfile(isolateId string,
                       reset bool,
                       gc GCOption) AllocationProfile

  // Returns the heap map for an isolate.
  getHeapMap(isolateId string) HeapMap

  // Returns how many bytes are retained by some target Class or Instance.
  getRetainedSize(isolateId string, targetId string) InstanceRef

  // Returns a path demonstrating why an object is retained in memory.
  //
  // TODO(turnidge): Make limit an int instead of a string.
  getRetainingPath(isolateId string,
                   targetId string,
                   limit int) RetainingPath

  // Returns a collection of inbound references to some object.
  //
  // TODO(turnidge): Make limit an int instead of a string.
  getInboundReferences(isolateId string,
                       targetId string,
                       limit int) InboundReferences

  getClassList(isolateId string) ClassList

  // When <code>onlyWithInstantiations</code> is true, the list only includes
  // type arguments with instantiations. Otherwise, all type arguments are
  // returned.
  getTypeArgumentsList(isolateId string,
                       onlyWithInstantiations bool) TypeArgumentsList

  getIsolateMetricList(isolateId string,
                       type MetricSelector) MetricList

  getIsolateMetric(isolateId string,
                   metricId string) Metric

  getVMMetricList() MetricList

  getVMMetric(metricId string) Metric

  _echo(isolateId string,
        text string) _EchoResponse

  _echoVM(text string) _EchoResponse

  // Triggers a ServiceEvent with EventType '_Echo'.
  _triggerEchoEvent(isolateId string,
                    text string) _EchoResponse

  // Response is bad JSON.
  _respondWithMalformedJson(isolateId string) Response

  // Response is not an object.
  _respondWithMalformedObject(isolateId string) Response
}


// Every top level response returned by the Service interface extends
// <code>Response</code>.  This allows the client to distinguish
// between different kinds of responses by using the <code>type</code>
// property.
struct Response {
  // Every response returned by the VM Service has the
  // <code>type</code> property.  This allows the client distinguish
  // between different kinds of responses.
  type    string

  // Some responses will have the <code>_vmType</code> property.  This
  // provides the VM-internal type name of an object, and is provided
  // only when this type name differs from the <code>type</code>
  // property.
  _vmType string [optional]
}


struct _EchoResponse extends Response {
  text string
}


// Persistent objects in the vm are returned as subclasses of Object.
struct Object extends Response {
  // The object <code>id</code> can be used to refer to a persistent
  // object inside the vm or an isolate.
  id  string
}


// An <code>Instance</code> represents a Dart-language object.
struct Instance extends Object {
  placeholder int
}


// A <code>Breakpoint</code> describes a debugger breakpoint.
struct Breakpoint extends Object {
  breakpointNumber int
  enabled          bool
  resolved         bool
  location         Location
}


// References to persistent objects in the vm are returned as
// subclasses of ObjectRef.
struct ObjectRef extends Response {
  // The object <code>id</code> can be used to refer to a persistent
  // object inside the vm or an isolate.
  id  string
}


// A <code>CodeRef</code> encodes a reference to a <code>Code</code> object.
struct CodeRef extends ObjectRef {
  placeholder int
}


struct ClassRef extends ObjectRef {
  placeholder int
}


struct TypeArgumentsRef extends ObjectRef {
  placeholder int
}


// A <code>FunctionRef</code> encodes a reference to a <code>Function</code> object.
struct FunctionRef extends ObjectRef {
  placeholder int
}


// A <code>FieldRef</code> encodes a reference to a <code>Field</code> object.
struct FieldRef extends ObjectRef {
  placeholder int
}


// A <code>InstanceRef</code> encodes a reference to a <code>Instance</code> object.
struct InstanceRef extends ObjectRef {
  placeholder int
}


// A <code>ScriptRef</code> encodes a reference to a <code>Script</code> object.
struct ScriptRef extends ObjectRef {
  placeholder int
}


struct Class extends Object {
  placeholder int
}


struct TypeArguments extends Object {
  placeholder int
}


// A <code>Location</code> encodes a location withing a dart script.
//
// TODO(turnidge): Should this really be broken out as its own type?
// If so, we should use it more consistently in the api.  For example,
// in Frame.
struct Location {
  script   ScriptRef
  tokenPos int
}


// A <code>Variable</code> represents one name/value pair from a frame.
struct Variable {
  name  string
  value InstanceRef
}


// A <code>Frame</code> represents one frame from an isolate's stack.
struct Frame {
  script   ScriptRef
  tokenPos int
  function FunctionRef
  code     CodeRef
  vars     []Variable
}


// A <code>Stack</code> represents an isolate's execution stack.
struct Stack extends Response {
  frames []Frame
}


struct CodeCoverage extends Response {
  placeholder int
}

// A <code>TagProfile</code> is a limited profile encoded as parallel
// arrays of tag names and tag values.
struct TagProfile extends Response {
  names    []string
  counters []int
}


// A list of <code>Breakpoint</code>
struct BreakpointList extends Response {
  breakpoints []Breakpoint
}


// An <code>AllocationProfile</code> encodes an allocation profile.
struct AllocationProfile extends Response {
  todo int
}


// A <code>CpuProfile</code> encodes a full cpu profile.
struct CpuProfile extends Response {
  samples        int
  depth          int
  period         int
  timeSpan       float
  exclusive_trie []int
  codes          []CodeRegion
}


// A <code>CodeRegion</code> represents profiling information for a
// specific <code>Code</code> object.
struct CodeRegion {
  kind            string
  inclusive_ticks int
  exclusive_ticks int
  code            CodeRef
  ticks           []int
  callers         []int
}

// An <code>HeapMap</code> provides a memory view of all heap allocated objects.
struct HeapMap extends Response {
  todo int
}


// An <code>HeapMap</code> provides a memory view of all heap allocated objects.
struct RetainingPath extends Response {
  length int
  elements []RetainingPathElement
}


// One entry in a <code>RetainingPath</code>.
struct RetainingPathElement {
  index           int
  element         InstanceRef
  parentListIndex int [optional]
  parentField     FieldRef [optional]
}


struct InboundReferences extends Response {
  length int
  references []InboundReference
}


// TODO(koda): slot can actually be a string, and integer or a
// FieldRef.  Fix this to be consistent with RetainingPathElement.
struct InboundReference {
  source InstanceRef
  slot   int
}


struct ClassList extends Response {
  classes []ClassRef
}


struct TypeArgumentsList extends Response {
  tableSize int
  tableUsed int
  typeArguments []TypeArgumentsRef
}


struct MetricList extends Response {
  metrics []Metric
}


struct Metric extends Response {
  name string
  description string
}


struct Gauge extends Metric {
  value double
  min double
  max double
}


struct Counter extends Metric {
  value double
}


// A <code>GCOption</code> is used to indicate which form of garbage
// collection is requested.
enum GCOption {
  full
}

// A <code>StepOption</code> is used to indicate which form of
// single-stepping is requested.
enum StepOption {
  into
  over
  out
}

// A <code>TagSelector</code> is used to indicate which sets of tags
// should take precedence in a cpu profile.
enum TagSelector {
  UserVM
  UserOnly
  VMUser
  VMOnly
  None
}

// A <code>MetricSelector</code> is used to indicate which list of metrics
// should be retrieved from an isolate.
enum MetricSelector {
  Dart,
  Native,
}