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using System;
using Microsoft.VisualStudio;
using Microsoft.VisualStudio.Shell;
using Microsoft.VisualStudio.Shell.Interop;

namespace Microsoft.VisualStudio.Project
{
    public class BuildDependency : IVsBuildDependency
    {
        Guid referencedProjectGuid = Guid.Empty;
        ProjectNode projectMgr = null;

    
        public BuildDependency(ProjectNode projectMgr, Guid projectReference)
        {
            this.referencedProjectGuid = projectReference;
            this.projectMgr = projectMgr;
        }

        #region IVsBuildDependency methods
        public int get_CanonicalName(out string canonicalName)
        {
            canonicalName = null;
            return VSConstants.S_OK;
        }

        public int get_Type(out System.Guid guidType)
        {
            // All our dependencies are build projects
            guidType = VSConstants.GUID_VS_DEPTYPE_BUILD_PROJECT;
            return VSConstants.S_OK;
        }

        public int get_Description(out string description)
        {
            description = null;
            return VSConstants.S_OK;
        }

    
        public int get_HelpContext(out uint helpContext)
        {
            helpContext = 0;
            return VSConstants.E_NOTIMPL;
        }

        public int get_HelpFile(out string helpFile)
        {
            helpFile = null;
            return VSConstants.E_NOTIMPL;
        }

        public int get_MustUpdateBefore(out int mustUpdateBefore)
        {
            // Must always update dependencies
            mustUpdateBefore = 1;

            return VSConstants.S_OK;
        }

        public int get_ReferredProject(out object unknownProject)
        {
            unknownProject = null;

            unknownProject = this.GetReferencedHierarchy();

            // If we cannot find the referenced hierarchy return S_FALSE.
            return (unknownProject == null) ? VSConstants.S_FALSE : VSConstants.S_OK;
        }

        #endregion

        #region helper methods
        private IVsHierarchy GetReferencedHierarchy()
        {
            IVsHierarchy hierarchy = null;

            if(this.referencedProjectGuid == Guid.Empty || this.projectMgr == null || this.projectMgr.IsClosed)
            {
                return hierarchy;
            }

            return VsShellUtilities.GetHierarchy(this.projectMgr.Site, this.referencedProjectGuid);

        }

        #endregion

    }
}
