using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.VisualStudio.Debugger.Interop;
using System.Diagnostics;
using System.Collections.ObjectModel;

namespace Cosmos.Debug.VSDebugEngine
{
    class EngineCallback //: ISampleEngineCallback
    {
        readonly IDebugEventCallback2 m_ad7Callback;
        readonly AD7Engine m_engine;

        public EngineCallback(AD7Engine engine, IDebugEventCallback2 ad7Callback)
        {
            m_ad7Callback = ad7Callback;
            m_engine = engine;
        }

        public void Send(IDebugEvent2 eventObject, string iidEvent, IDebugProgram2 program, IDebugThread2 thread)
        {
            uint attributes; 
            Guid riidEvent = new Guid(iidEvent);

            EngineUtils.RequireOk(eventObject.GetAttributes(out attributes));

            EngineUtils.RequireOk(m_ad7Callback.Event(m_engine, null, program, thread, eventObject, ref riidEvent, attributes));
        }

        public void Send(IDebugEvent2 eventObject, string iidEvent, IDebugThread2 thread)
        {
            Send(eventObject, iidEvent, m_engine, thread);
        }

        #region ISampleEngineCallback Members

        public void OnError(int hrErr)
        {
            //System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);

            // IDebugErrorEvent2 is used to report error messages to the user when something goes wrong in the debug engine.
            // The sample engine doesn't take advantage of this.
        }

        public void OnModuleLoad()//DebuggedModule debuggedModule)
        {
            // This will get called when the entrypoint breakpoint is fired because the engine sends a mod-load event
            // for the exe.
            //if (m_engine.DebuggedProcess != null)
            //{
            //    System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);
            //}

            //AD7Module ad7Module = new AD7Module(debuggedModule);
            //AD7ModuleLoadEvent eventObject = new AD7ModuleLoadEvent(ad7Module, true /* this is a module load */);

            //debuggedModule.Client = ad7Module;

            //// The sample engine does not support binding breakpoints as modules load since the primary exe is the only module
            //// symbols are loaded for. A production debugger will need to bind breakpoints when a new module is loaded.

            //Send(eventObject, AD7ModuleLoadEvent.IID, null);
        }

        public void OnModuleUnload()//DebuggedModule debuggedModule)
        {
            //System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);

            //AD7Module ad7Module = (AD7Module)debuggedModule.Client;
            //System.Diagnostics.Debug.Assert(ad7Module != null);

            //AD7ModuleLoadEvent eventObject = new AD7ModuleLoadEvent(ad7Module, false /* this is a module unload */);

            //Send(eventObject, AD7ModuleLoadEvent.IID, null);
        }

        public void OnOutputString(string outputString)
        {
            //System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);

            AD7OutputDebugStringEvent eventObject = new AD7OutputDebugStringEvent(outputString);

            Send(eventObject, AD7OutputDebugStringEvent.IID, null);
        }

        public void OnProcessExit(uint exitCode)
        {
            //System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);

            AD7ProgramDestroyEvent eventObject = new AD7ProgramDestroyEvent(exitCode);

            Send(eventObject, AD7ProgramDestroyEvent.IID, null);
        }

        public void OnThreadExit()//DebuggedThread debuggedThread, uint exitCode)
        {
            //System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);

            //AD7Thread ad7Thread = (AD7Thread)debuggedThread.Client;
            //System.Diagnostics.Debug.Assert(ad7Thread != null);

            //AD7ThreadDestroyEvent eventObject = new AD7ThreadDestroyEvent(exitCode);

            //Send(eventObject, AD7ThreadDestroyEvent.IID, ad7Thread);
        }

        public void OnThreadStart()//DebuggedThread debuggedThread)
        {
            // This will get called when the entrypoint breakpoint is fired because the engine sends a thread start event
            // for the main thread of the application.
            //if (m_engine.DebuggedProcess != null)
            //{
            //    System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);
            //}

            //AD7Thread ad7Thread = new AD7Thread(m_engine, debuggedThread);
            //debuggedThread.Client = ad7Thread;
            
            //AD7ThreadCreateEvent eventObject = new AD7ThreadCreateEvent();
            //Send(eventObject, AD7ThreadCreateEvent.IID, ad7Thread);
        }

        public void OnBreakpoint()//DebuggedThread thread, ReadOnlyCollection<object> clients, uint address)
        {
            //IDebugBoundBreakpoint2[] boundBreakpoints = new IDebugBoundBreakpoint2[clients.Count];

            //int i = 0;
            //foreach (object objCurrentBreakpoint in clients)
            //{
            //    boundBreakpoints[i] = (IDebugBoundBreakpoint2)objCurrentBreakpoint;
            //    i++;
            //}

            //// An engine that supports more advanced breakpoint features such as hit counts, conditions and filters
            //// should notify each bound breakpoint that it has been hit and evaluate conditions here.
            //// The sample engine does not support these features.

            //AD7BoundBreakpointsEnum boundBreakpointsEnum = new AD7BoundBreakpointsEnum(boundBreakpoints);

            //AD7BreakpointEvent eventObject = new AD7BreakpointEvent(boundBreakpointsEnum);

            //AD7Thread ad7Thread = (AD7Thread)thread.Client;
            //Send(eventObject, AD7BreakpointEvent.IID, ad7Thread);
        }

        public void OnException()//DebuggedThread thread, uint code)
        {
            // Exception events are sent when an exception occurs in the debuggee that the debugger was not expecting.
            // The sample engine does not support these.
            throw new Exception("The method or operation is not implemented.");
        }

        public void OnStepComplete()//DebuggedThread thread)
        {
            // Step complete is sent when a step has finished. The sample engine does not support stepping.
            throw new Exception("The method or operation is not implemented.");
        }

        public void OnAsyncBreakComplete()//DebuggedThread thread)
        {
            // This will get called when the engine receives the breakpoint event that is created when the user
            // hits the pause button in vs.
            //System.Diagnostics.Debug.Assert(Worker.CurrentThreadId == m_engine.DebuggedProcess.PollThreadId);

            //AD7Thread ad7Thread = (AD7Thread)thread.Client;
            //AD7AsyncBreakCompleteEvent eventObject = new AD7AsyncBreakCompleteEvent();
            //Send(eventObject, AD7AsyncBreakCompleteEvent.IID, ad7Thread);
        }

        public void OnLoadComplete()//DebuggedThread thread)
        {
            //AD7Thread ad7Thread = (AD7Thread)thread.Client;
            //AD7LoadCompleteEvent eventObject = new AD7LoadCompleteEvent();
            //Send(eventObject, AD7LoadCompleteEvent.IID, ad7Thread);
        }

        public void OnProgramDestroy(uint exitCode)
        {                     
            AD7ProgramDestroyEvent eventObject = new AD7ProgramDestroyEvent(exitCode);
            Send(eventObject, AD7ProgramDestroyEvent.IID, null);
        }

        // Engines notify the debugger about the results of a symbol serach by sending an instance
        // of IDebugSymbolSearchEvent2
        public void OnSymbolSearch()//DebuggedModule module, string status, uint dwStatusFlags)
        {
            //string statusString = (dwStatusFlags == 1 ? "Symbols Loaded - " : "No symbols loaded") + status;

            //AD7Module ad7Module = new AD7Module(module);
            //AD7SymbolSearchEvent eventObject = new AD7SymbolSearchEvent(ad7Module, statusString, dwStatusFlags);
            //Send(eventObject, AD7SymbolSearchEvent.IID, null);
        }

        // Engines notify the debugger that a breakpoint has bound through the breakpoint bound event.
        public void OnBreakpointBound(object objBoundBreakpoint, uint address)
        {
            AD7BoundBreakpoint boundBreakpoint = (AD7BoundBreakpoint)objBoundBreakpoint;
            IDebugPendingBreakpoint2 pendingBreakpoint;
            ((IDebugBoundBreakpoint2)boundBreakpoint).GetPendingBreakpoint(out pendingBreakpoint);

            AD7BreakpointBoundEvent eventObject = new AD7BreakpointBoundEvent((AD7PendingBreakpoint)pendingBreakpoint, boundBreakpoint);
            Send(eventObject, AD7BreakpointBoundEvent.IID, null);
        }

        #endregion
    }
}