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/*******************************************************************************
 * Copyright (c) 2005, 2007 committers of openArchitectureWare and others.
 * 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:
 *     committers of openArchitectureWare - initial API and implementation
 *******************************************************************************/

package org.eclipse.internal.xtend.xtend.ast;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.internal.xtend.expression.ast.DeclaredParameter;
import org.eclipse.internal.xtend.expression.ast.Identifier;
import org.eclipse.internal.xtend.expression.ast.SyntaxElement;
import org.eclipse.xtend.expression.AnalysationIssue;
import org.eclipse.xtend.expression.EvaluationException;
import org.eclipse.xtend.expression.ExecutionContext;
import org.eclipse.xtend.expression.Variable;
import org.eclipse.xtend.typesystem.Type;

public abstract class AbstractExtension extends SyntaxElement implements Extension {

    private Identifier name;

    private List<DeclaredParameter> formalParameters;

    protected ExtensionFile file;

    protected boolean cached = false;

    private boolean isPrivate = false;

	public AbstractExtension(final Identifier name, final Identifier returnType,
			final List<DeclaredParameter> formalParameters, final boolean cached, final boolean isPrivate) {
        this.name = name;
        this.formalParameters = formalParameters;
        this.returnType = returnType;
        this.cached = cached;
        this.isPrivate = isPrivate;
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#getFormalParameters()
	 */
	public List<DeclaredParameter> getFormalParameters() {
        return formalParameters;
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#getName()
	 */
    public String getName() {
        return name.getValue();
    }
    
    public Identifier getNameIdentifier() {
		return name;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.eclipse.xtend.ast.Extension#getReturnType(org.
	 * openarchitectureware.type.Type[],
	 * org.eclipse.expression.ExecutionContext, java.util.Set)
	 */
    public final Type getReturnType(final Type[] parameters, ExecutionContext ctx, final Set<AnalysationIssue> issues) {
        ctx = ctx.cloneWithResource(getExtensionFile());
        return internalGetReturnType(parameters, ctx, issues);
    }

    protected abstract Type internalGetReturnType(Type[] parameters, ExecutionContext ctx, Set<AnalysationIssue> issues);

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.xtend.ast.Extension#analyze(org.eclipse
	 * .expression.ExecutionContext, java.util.Set)
	 */
    public final void analyze(ExecutionContext ctx, final Set<AnalysationIssue> issues) {
		try {
			if (ctx.getCallback() != null) {
				ctx.getCallback().pre(this, ctx);
			}
        final List<DeclaredParameter> params = getFormalParameters();
        final Set<String> usedNames = new HashSet<String>();
        for (final Iterator<DeclaredParameter> iter = params.iterator(); iter.hasNext();) {
            final DeclaredParameter p = iter.next();
            final Type pt = ctx.getTypeForName(p.getType().getValue());
            if (pt == null) {
                issues.add(new AnalysationIssue(AnalysationIssue.TYPE_NOT_FOUND, "Type not found: "
                        + p.getType().getValue(), p.getType()));
            }
            if (!usedNames.add(p.getName().getValue())) {
                issues.add(new AnalysationIssue(AnalysationIssue.SYNTAX_ERROR, "Duplicate parameter name: "
                        + p.getName().getValue(), p.getName()));
            }
            ctx = ctx.cloneWithVariable(new Variable(p.getName().getValue(), pt));
        }
        if (returnType != null) {
            final Type pt = ctx.getTypeForName(returnType.getValue());
            if (pt == null) {
                issues.add(new AnalysationIssue(AnalysationIssue.TYPE_NOT_FOUND, "Type not found: "
                        + returnType.getValue(), returnType));
            }
        }
        try {
        	analyzeInternal(ctx, issues);
			}
			catch (RuntimeException ex) {
        	ctx.handleRuntimeException(ex, this, null);
        }
    }
		finally {
			if (ctx.getCallback() != null) {
				ctx.getCallback().post(null);
			}
		}
	}

	protected void analyzeInternal(ExecutionContext ctx, Set<AnalysationIssue> issues) {
		checkForAmbiguousDefinitions(ctx, issues);
	}

    private final Map<List<Object>, Object> cache = new HashMap<List<Object>, Object>();

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.xtend.ast.Extension#evaluate(java.lang.Object[],
	 * org.eclipse.expression.ExecutionContext)
	 */
    public Object evaluate(final Object[] parameters, ExecutionContext ctx) {
    	try {
			if (ctx.getCallback() != null) {
				ctx.getCallback().pre(this, ctx);
			}
            if (cached) {
                final List<Object> l = Arrays.asList(parameters);
                if (cache.containsKey(l))
                    return cache.get(l);
            }
            if (getExtensionFile() == null)
                throw new IllegalStateException("No containing file!");
            ctx = ctx.cloneWithResource(getExtensionFile());
            final Object result = evaluateInternal(parameters, ctx);
            if (cached) {
                cache.put(Arrays.asList(parameters), result);
            }
            return result;
		}
		catch (RuntimeException ex) {
    		ctx.handleRuntimeException(ex, this, null);
    	}
		finally {
			if (ctx.getCallback() != null) {
				ctx.getCallback().post(null);
			}
		}
    	return null;
    }

    public final void setExtensionFile(final ExtensionFile f) {
        file = f;
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#getExtensionFile()
	 */
    public ExtensionFile getExtensionFile() {
        return file;
    }

    protected abstract Object evaluateInternal(Object[] parameters, ExecutionContext ctx);

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#getParameterNames()
	 */
    public List<String> getParameterNames() {
        final List<String> names = new ArrayList<String>();
        for (final Iterator<DeclaredParameter> iter = getFormalParameters().iterator(); iter.hasNext();) {
            names.add(iter.next().getName().getValue());
        }
        return names;
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.xtend.ast.Extension#init(org.eclipse
	 * .expression.ExecutionContext)
	 */
    public void init(final ExecutionContext ctx) {
        if (parameterTypes == null) {
            try {
                parameterTypes = new ArrayList<Type>();
                for (final Iterator<DeclaredParameter> iter = getFormalParameters().iterator(); iter.hasNext();) {
                    final String name = iter.next().getType().getValue();
                    final Type t = ctx.getTypeForName(name);
                    if (t == null)
                        throw new EvaluationException("Couldn't resolve type for '" + name
                                + "'. Did you forget to configure the corresponding metamodel?", this, ctx);
                    parameterTypes.add(t);
                }
			}
			catch (final RuntimeException e) {
                parameterTypes = null;
                throw e;
            }
        }
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#getReturnType()
	 */
    public Type getReturnType() {
        throw new UnsupportedOperationException();
    }

    private List<Type> parameterTypes = null;

    protected Identifier returnType;

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#getParameterTypes()
	 */
    public List<Type> getParameterTypes() {
        return parameterTypes;
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.xtend.ast.Extension#getReturnTypeIdentifier()
	 */
    public Identifier getReturnTypeIdentifier() {
        return returnType;
    }

    private String _stringRepresentation = null;

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#toString()
	 */
    @Override
    public String toString() {
        if (_stringRepresentation == null) {
			_stringRepresentation = (returnType != null ? returnType.getValue() + " " : "") + getName() + "("
					+ paramsToString() + ")";
        }

        return _stringRepresentation;
    }
    
    private String _outlineRepresentation = null;
    
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#toOutlineString()
	 */
    public String toOutlineString() {
        if (_outlineRepresentation == null) {
			_outlineRepresentation = getName() + "(" + paramsToOutlineString() + ")"
					+ (returnType != null ? ": " + returnType.getValue() : "");
        } 
        return _outlineRepresentation;
    }

    private String paramsToString() {
        final StringBuffer buff = new StringBuffer();
        for (final Iterator<DeclaredParameter> iter = getFormalParameters().iterator(); iter.hasNext();) {
            final DeclaredParameter element = iter.next();
            buff.append(element.getType() + " " + element.getName());
            if (iter.hasNext()) {
                buff.append(",");
            }
        }
        return buff.toString();
    }

    private String paramsToOutlineString() {
        final StringBuffer buff = new StringBuffer();
        for (final Iterator<DeclaredParameter> iter = getFormalParameters().iterator(); iter.hasNext();) {
            final DeclaredParameter element = iter.next();
			buff.append(element.getType());
            if (iter.hasNext()) {
                buff.append(", ");
            }
        }
        return buff.toString();
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#isPrivate()
	 */
    public boolean isPrivate() {
        return isPrivate;
    }

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.xtend.ast.Extension#isCached()
	 */
	public boolean isCached() {
        return cached;
    }
    
    public String getQualifiedName() {
		return getExtensionFile().getFullyQualifiedName() + "::" + getName();
    }

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((getName() == null) ? 0 : getName().hashCode());
		result = prime * result + ((parameterTypes == null) ? 0 : parameterTypes.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		final AbstractExtension other = (AbstractExtension) obj;
		if (getName() == null) {
			if (other.getName() != null)
				return false;
		}
		else if (!getName().equals(other.getName()))
			return false;
		if (parameterTypes == null) {
			if (other.parameterTypes != null)
				return false;
		}
		else if (!parameterTypes.equals(other.parameterTypes))
			return false;
		return true;
	}
    
	protected void checkForAmbiguousDefinitions(final ExecutionContext ctx, final Set<AnalysationIssue> issues) {
		String name = getName();
		for (Extension ext : ctx.getAllExtensions()) {
			String otherName = ext.getName();
			if (name.equals(otherName) && (!getFileName().equals(ext.getFileName()) || getLine() != ext.getLine())) {
				if (getParameterTypes().equals(ext.getParameterTypes())) {
					issues.add(new AnalysationIssue(AnalysationIssue.INTERNAL_ERROR, "Ambiguous definition: "
							+ toOutlineString(), this, true));
					issues.add(new AnalysationIssue(AnalysationIssue.INTERNAL_ERROR, "Ambiguous definition: "
							+ ext.toOutlineString(), (AbstractExtension) ext, true));
				}
			}
		}
	}

}

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