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/*
Copyright (c) 2008 Arno Haase.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/epl-v10.html

Contributors:
    Arno Haase - initial API and implementation
 */
package org.eclipse.xtend.middleend.old.xtend;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.internal.xtend.xtend.XtendFile;
import org.eclipse.internal.xtend.xtend.ast.Extension;
import org.eclipse.internal.xtend.xtend.ast.ExtensionFile;
import org.eclipse.internal.xtend.xtend.ast.ImportStatement;
import org.eclipse.xtend.backend.common.BackendTypesystem;
import org.eclipse.xtend.backend.common.NamedFunction;
import org.eclipse.xtend.backend.functions.FunctionDefContextFactory;
import org.eclipse.xtend.backend.functions.FunctionDefContextInternal;
import org.eclipse.xtend.backend.util.Cache;
import org.eclipse.xtend.expression.ExecutionContext;
import org.eclipse.xtend.middleend.old.common.OldHelper;
import org.eclipse.xtend.middleend.old.common.TypeToBackendType;
import org.eclipse.xtend.middleend.old.internal.xtendlib.XtendLibContributor;


/**
 * This class manages the interdependent graph of parsed and converted files, allowing access to them by "compilation unit".
 * 
 * @author Arno Haase (http://www.haase-consulting.com)
 */
public final class OldXtendRegistry {
    private final ExecutionContext _ctx;
    private final BackendTypesystem _ts;

    private final Cache<String, FunctionDefContextInternal> _functionDefContexts = new Cache<String, FunctionDefContextInternal> () {
        @Override
        protected FunctionDefContextInternal create (String compilationUnit) {
            return new FunctionDefContextFactory (_ts).create();
        }
    };

    
    /**
     * all functions actually defined in a given compilation unit
     */
    private final Map<String, List<NamedFunction>> _definedFunctionsByResource = new HashMap <String, List<NamedFunction>>();
    
    /**
     * all functions exported by a compilation unit, i.e. those functions visible to others that import it
     */
    private final Map<String, List<NamedFunction>> _exportedFunctionsByResource = new HashMap <String, List<NamedFunction>>();

    /**
     * all locally defined functions that are exported by a compilation unit. This is an artifact to cleanly handle
     * reexports.
     */
    private final Map<String, List<NamedFunction>> _locallyExportedFunctionsByResource = new HashMap <String, List<NamedFunction>>();

    
    public OldXtendRegistry (ExecutionContext ctx, BackendTypesystem ts) {
        _ctx = ctx;
        _ts = ts;
    }
    
    
    private FunctionDefContextInternal getFunctionDefContext (String xtendName) {
        return _functionDefContexts.get (OldHelper.normalizeXtendResourceName (xtendName));
    }
    
    
    /**
     * parses and converts an Xtend file and all other files it depends on.
     */
    public void registerExtension (String xtendFile) {
        xtendFile = OldHelper.normalizeXtendResourceName (xtendFile);
        
        if (_definedFunctionsByResource.containsKey(xtendFile))
            return;
        
        final ExtensionFile file = (ExtensionFile) _ctx.getResourceManager().loadResource (xtendFile, XtendFile.FILE_EXTENSION);
        if (file == null)
            throw new IllegalArgumentException ("could not find extension '" + xtendFile + "'");
        
        final ExecutionContext ctx = _ctx.cloneWithResource (file);
        
        final TypeToBackendType typeConverter = new TypeToBackendType (_ts, ctx);
        final OldExtensionConverter extensionFactory = new OldExtensionConverter (ctx, typeConverter);
        
        for (Extension ext: file.getExtensions())
            ext.init (ctx);
        
        final List<NamedFunction> defined = new ArrayList<NamedFunction>();
        final List<NamedFunction> exported = new ArrayList<NamedFunction>();
        
        final FunctionDefContextInternal fdc = getFunctionDefContext (xtendFile);

        // register the XtendLib. Do this first so the extension can override functions
        fdc.register (new XtendLibContributor (_ts).getContributedFunctions());
        
        fdc.register (new CheckConverter (ctx, typeConverter).createCheckFunction(_ts, fdc, file));
        
        for (Extension ext: file.getExtensions()) {
            final NamedFunction f = extensionFactory.create (ext, fdc);

            defined.add(f);
            
            if (!ext.isPrivate())
                exported.add (f);
        }
        
        _definedFunctionsByResource.put (xtendFile, defined);
        _exportedFunctionsByResource.put (xtendFile, exported);
        _locallyExportedFunctionsByResource.put (xtendFile, new ArrayList<NamedFunction> (exported));
        
        // make sure all imported resources are registered as well
        for (String imported: file.getImportedExtensions())
            registerExtension (imported);

        // make all imported extensions visible for the scope of this compilation unit
        for (String importedResource: file.getImportedExtensions()) {
            for (NamedFunction f: _locallyExportedFunctionsByResource.get (OldHelper.normalizeXtendResourceName (importedResource)))
                fdc.register (f);
        }

        final Set<String> visitedForReexport = new HashSet<String>();
        visitedForReexport.add (xtendFile);
        final List<NamedFunction> reexported = new ArrayList<NamedFunction>();
        getReexported (xtendFile, reexported, visitedForReexport, new HashSet<String>());
        
        for (NamedFunction f: reexported) {
            exported.add (f);
            fdc.register (f);
        }
    }
    
    private void getReexported (String xtendFile, Collection<NamedFunction> result, Set<String> harvestedCompilationUnits, Set<String> processedCompilationUnits) {
        xtendFile = OldHelper.normalizeXtendResourceName (xtendFile);
        
        if (processedCompilationUnits.contains (xtendFile))
            return;
        processedCompilationUnits.add (xtendFile);
        
        if (! harvestedCompilationUnits.contains (xtendFile)) {
            for (NamedFunction f: _locallyExportedFunctionsByResource.get(xtendFile))
                result.add (f);
            
            harvestedCompilationUnits.add (xtendFile);
        }
        
        final ExtensionFile file = (ExtensionFile) _ctx.getResourceManager().loadResource (xtendFile, XtendFile.FILE_EXTENSION);
        for (ImportStatement imp: file.getExtImports()) {
            if (imp.isExported())
                getReexported (imp.getImportedId().getValue(), result, harvestedCompilationUnits, processedCompilationUnits);
        }
    }
    
    public Collection<NamedFunction> getContributedFunctions (String xtendFile) {
        return _exportedFunctionsByResource.get (OldHelper.normalizeXtendResourceName(xtendFile));
    }
}







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