/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package net.sourceforge.phpdt.internal.corext.template.php;

import java.util.ArrayList;

import net.sourceforge.phpdt.core.ToolFactory;
import net.sourceforge.phpdt.core.compiler.IScanner;
import net.sourceforge.phpdt.core.compiler.ITerminalSymbols;
import net.sourceforge.phpdt.core.compiler.InvalidInputException;
import net.sourceforge.phpdt.internal.corext.codemanipulation.StubUtility;

import org.eclipse.jface.text.templates.ContextTypeRegistry;
import org.eclipse.jface.text.templates.GlobalTemplateVariables;
import org.eclipse.jface.text.templates.TemplateContext;
import org.eclipse.jface.text.templates.TemplateContextType;
import org.eclipse.jface.text.templates.TemplateException;
import org.eclipse.jface.text.templates.TemplateVariable;
import org.eclipse.jface.text.templates.TemplateVariableResolver;

/**
 */
public class CodeTemplateContextType extends TemplateContextType {

	/* context types */
	public static final String CATCHBLOCK_CONTEXTTYPE = "php_catchblock_context"; //$NON-NLS-1$

	public static final String METHODBODY_CONTEXTTYPE = "php_methodbody_context"; //$NON-NLS-1$

	public static final String CONSTRUCTORBODY_CONTEXTTYPE = "php_constructorbody_context"; //$NON-NLS-1$

	public static final String GETTERBODY_CONTEXTTYPE = "php_getterbody_context"; //$NON-NLS-1$

	public static final String SETTERBODY_CONTEXTTYPE = "php_setterbody_context"; //$NON-NLS-1$

	public static final String NEWTYPE_CONTEXTTYPE = "php_newtype_context"; //$NON-NLS-1$

	public static final String NEWHTML_CONTEXTTYPE = "php_newhtml_context"; //$NON-NLS-1$

	public static final String TYPECOMMENT_CONTEXTTYPE = "php_typecomment_context"; //$NON-NLS-1$

	public static final String FIELDCOMMENT_CONTEXTTYPE = "php_fieldcomment_context"; //$NON-NLS-1$

	public static final String METHODCOMMENT_CONTEXTTYPE = "php_methodcomment_context"; //$NON-NLS-1$

	public static final String CONSTRUCTORCOMMENT_CONTEXTTYPE = "php_constructorcomment_context"; //$NON-NLS-1$

	public static final String OVERRIDECOMMENT_CONTEXTTYPE = "php_overridecomment_context"; //$NON-NLS-1$

	public static final String GETTERCOMMENT_CONTEXTTYPE = "php_gettercomment_context"; //$NON-NLS-1$

	public static final String SETTERCOMMENT_CONTEXTTYPE = "php_settercomment_context"; //$NON-NLS-1$

	/* templates */
	public static final String COMMENT_SUFFIX = "comment"; //$NON-NLS-1$

	public static final String CATCHBLOCK = "catchblock"; //$NON-NLS-1$

	public static final String METHODSTUB = "methodbody"; //$NON-NLS-1$	

	public static final String NEWTYPE = "newtype"; //$NON-NLS-1$	

	public static final String NEWHTML = "newhtml"; //$NON-NLS-1$	

	public static final String CONSTRUCTORSTUB = "constructorbody"; //$NON-NLS-1$

	public static final String GETTERSTUB = "getterbody"; //$NON-NLS-1$

	public static final String SETTERSTUB = "setterbody"; //$NON-NLS-1$

	public static final String TYPECOMMENT = "type" + COMMENT_SUFFIX; //$NON-NLS-1$

	public static final String FIELDCOMMENT = "field" + COMMENT_SUFFIX; //$NON-NLS-1$

	public static final String METHODCOMMENT = "method" + COMMENT_SUFFIX; //$NON-NLS-1$

	public static final String CONSTRUCTORCOMMENT = "constructor" + COMMENT_SUFFIX; //$NON-NLS-1$

	public static final String OVERRIDECOMMENT = "override" + COMMENT_SUFFIX; //$NON-NLS-1$

	public static final String GETTERCOMMENT = "getter" + COMMENT_SUFFIX; //$NON-NLS-1$

	public static final String SETTERCOMMENT = "setter" + COMMENT_SUFFIX; //$NON-NLS-1$

	/* resolver types */
	public static final String EXCEPTION_TYPE = "exception_type"; //$NON-NLS-1$

	public static final String EXCEPTION_VAR = "exception_var"; //$NON-NLS-1$

	public static final String ENCLOSING_METHOD = "enclosing_method"; //$NON-NLS-1$

	public static final String ENCLOSING_TYPE = "enclosing_type"; //$NON-NLS-1$

	public static final String BODY_STATEMENT = "body_statement"; //$NON-NLS-1$

	public static final String FIELD = "field"; //$NON-NLS-1$

	public static final String FIELD_TYPE = "field_type"; //$NON-NLS-1$

	public static final String BARE_FIELD_NAME = "bare_field_name"; //$NON-NLS-1$

	public static final String PARAM = "param"; //$NON-NLS-1$

	public static final String RETURN_TYPE = "return_type"; //$NON-NLS-1$

	public static final String SEE_TAG = "see_to_overridden"; //$NON-NLS-1$

	public static final String TAGS = "tags"; //$NON-NLS-1$

	public static final String TYPENAME = "type_name"; //$NON-NLS-1$

	public static final String FILENAME = "file_name"; //$NON-NLS-1$

	public static final String PACKAGENAME = "package_name"; //$NON-NLS-1$

	public static final String PROJECTNAME = "project_name"; //$NON-NLS-1$

	public static final String PACKAGE_DECLARATION = "package_declaration"; //$NON-NLS-1$

	public static final String TYPE_DECLARATION = "type_declaration"; //$NON-NLS-1$

	public static final String TYPE_COMMENT = "typecomment"; //$NON-NLS-1$

	/**
	 * Resolver that resolves to the variable defined in the context.
	 */
	public static class CodeTemplateVariableResolver extends
			TemplateVariableResolver {
		public CodeTemplateVariableResolver(String type, String description) {
			super(type, description);
		}

		protected String resolve(TemplateContext context) {
			return context.getVariable(getType());
		}
	}

	/**
	 * Resolver for javadoc tags.
	 */
	public static class TagsVariableResolver extends TemplateVariableResolver {
		public TagsVariableResolver() {
			super(
					TAGS,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.tags")); //$NON-NLS-1$
		}

		protected String resolve(TemplateContext context) {
			return "@"; //$NON-NLS-1$
		}
	}

	/**
	 * Resolver for todo tags.
	 */
	protected static class Todo extends TemplateVariableResolver {

		public Todo() {
			super(
					"todo", JavaTemplateMessages.getString("CodeTemplateContextType.variable.description.todo")); //$NON-NLS-1$ //$NON-NLS-2$
		}

		protected String resolve(TemplateContext context) {
			String todoTaskTag = StubUtility
					.getTodoTaskTag(((CodeTemplateContext) context)
							.getJavaProject());
			if (todoTaskTag == null)
				return "XXX"; //$NON-NLS-1$

			return todoTaskTag;
		}
	}

	private boolean fIsComment;

	public CodeTemplateContextType(String contextName) {
		super(contextName);

		fIsComment = false;

		// global
		addResolver(new GlobalTemplateVariables.Dollar());
		addResolver(new GlobalTemplateVariables.Date());
		addResolver(new GlobalTemplateVariables.Year());
		addResolver(new GlobalTemplateVariables.Time());
		addResolver(new GlobalTemplateVariables.User());
		addResolver(new Todo());

		if (CATCHBLOCK_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					EXCEPTION_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.exceptiontype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					EXCEPTION_VAR,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.exceptionvar"))); //$NON-NLS-1$
		} else if (METHODBODY_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_METHOD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingmethod"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					BODY_STATEMENT,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.bodystatement"))); //$NON-NLS-1$
		} else if (CONSTRUCTORBODY_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					BODY_STATEMENT,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.bodystatement"))); //$NON-NLS-1$
		} else if (GETTERBODY_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_METHOD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingmethod"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					FIELD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.getterfieldname"))); //$NON-NLS-1$
		} else if (SETTERBODY_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_METHOD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingmethod"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					FIELD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.getterfieldname"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					PARAM,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.param"))); //$NON-NLS-1$
		} else if (NEWTYPE_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					TYPENAME,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.typename"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					PACKAGE_DECLARATION,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.packdeclaration"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					TYPE_DECLARATION,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.typedeclaration"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					TYPE_COMMENT,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.typecomment"))); //$NON-NLS-1$
			addCompilationUnitVariables();
		} else if (NEWHTML_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					TYPENAME,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.typename"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					PACKAGE_DECLARATION,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.packdeclaration"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					TYPE_DECLARATION,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.typedeclaration"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					TYPE_COMMENT,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.typecomment"))); //$NON-NLS-1$
			addCompilationUnitVariables();
		} else if (TYPECOMMENT_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					TYPENAME,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.typename"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new TagsVariableResolver());
			addCompilationUnitVariables();
			fIsComment = true;
		} else if (FIELDCOMMENT_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					FIELD_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.fieldtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					FIELD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.fieldname"))); //$NON-NLS-1$
			addCompilationUnitVariables();
			fIsComment = true;
		} else if (METHODCOMMENT_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_METHOD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingmethod"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					RETURN_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.returntype"))); //$NON-NLS-1$
			addResolver(new TagsVariableResolver());
			addCompilationUnitVariables();
			fIsComment = true;
		} else if (OVERRIDECOMMENT_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_METHOD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingmethod"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					SEE_TAG,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.seetag"))); //$NON-NLS-1$
			addResolver(new TagsVariableResolver());
			addCompilationUnitVariables();
			fIsComment = true;
		} else if (CONSTRUCTORCOMMENT_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new TagsVariableResolver());
			addCompilationUnitVariables();
			fIsComment = true;
		} else if (GETTERCOMMENT_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					FIELD_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.getterfieldtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					FIELD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.getterfieldname"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_METHOD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingmethod"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					BARE_FIELD_NAME,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.barefieldname"))); //$NON-NLS-1$
			addCompilationUnitVariables();
			fIsComment = true;
		} else if (SETTERCOMMENT_CONTEXTTYPE.equals(contextName)) {
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					FIELD_TYPE,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.getterfieldtype"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					FIELD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.getterfieldname"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					ENCLOSING_METHOD,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.enclosingmethod"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					PARAM,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.param"))); //$NON-NLS-1$
			addResolver(new CodeTemplateVariableResolver(
					BARE_FIELD_NAME,
					JavaTemplateMessages
							.getString("CodeTemplateContextType.variable.description.barefieldname"))); //$NON-NLS-1$
			addCompilationUnitVariables();
			fIsComment = true;
		}
	}

	private void addCompilationUnitVariables() {
		addResolver(new CodeTemplateVariableResolver(
				FILENAME,
				JavaTemplateMessages
						.getString("CodeTemplateContextType.variable.description.filename"))); //$NON-NLS-1$
		addResolver(new CodeTemplateVariableResolver(
				PACKAGENAME,
				JavaTemplateMessages
						.getString("CodeTemplateContextType.variable.description.packagename"))); //$NON-NLS-1$
		addResolver(new CodeTemplateVariableResolver(
				PROJECTNAME,
				JavaTemplateMessages
						.getString("CodeTemplateContextType.variable.description.projectname"))); //$NON-NLS-1$
	}

	/*
	 * @see net.sourceforge.phpdt.internal.corext.template.ContextType#validateVariables(net.sourceforge.phpdt.internal.corext.template.TemplateVariable[])
	 */
	protected void validateVariables(TemplateVariable[] variables)
			throws TemplateException {
		ArrayList required = new ArrayList(5);
		//String contextName = getId();
		// if (NEWTYPE_CONTEXTTYPE.equals(contextName)) {
		// required.add(PACKAGE_DECLARATION);
		// required.add(TYPE_DECLARATION);
		// }
		for (int i = 0; i < variables.length; i++) {
			String type = variables[i].getType();
			if (getResolver(type) == null) {
				throw new TemplateException(
						JavaTemplateMessages
								.getFormattedString(
										"CodeTemplateContextType.validate.unknownvariable", type)); //$NON-NLS-1$
			}
			required.remove(type);
		}
		if (!required.isEmpty()) {
			String missing = (String) required.get(0);
			throw new TemplateException(
					JavaTemplateMessages
							.getFormattedString(
									"CodeTemplateContextType.validate.missingvariable", missing)); //$NON-NLS-1$
		}
		super.validateVariables(variables);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see net.sourceforge.phpdt.internal.corext.template.ContextType#createContext()
	 */
	public TemplateContext createContext() {
		return null;
	}

	public static void registerContextTypes(ContextTypeRegistry registry) {
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.CATCHBLOCK_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.METHODBODY_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.CONSTRUCTORBODY_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.GETTERBODY_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.SETTERBODY_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.NEWTYPE_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.NEWHTML_CONTEXTTYPE));

		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.TYPECOMMENT_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.FIELDCOMMENT_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.METHODCOMMENT_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.CONSTRUCTORCOMMENT_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.OVERRIDECOMMENT_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.GETTERCOMMENT_CONTEXTTYPE));
		registry.addContextType(new CodeTemplateContextType(
				CodeTemplateContextType.SETTERCOMMENT_CONTEXTTYPE));
	}

	/*
	 * @see net.sourceforge.phpdt.internal.corext.template.ContextType#validate(java.lang.String)
	 */
	public void validate(String pattern) throws TemplateException {
		super.validate(pattern);
		if (fIsComment) {
			if (!isValidComment(pattern)) {
				throw new TemplateException(
						JavaTemplateMessages
								.getString("CodeTemplateContextType.validate.invalidcomment")); //$NON-NLS-1$
			}
		}
	}

	private boolean isValidComment(String template) {
		IScanner scanner = ToolFactory.createScanner(true, false, false, true);// false);
		scanner.setSource(template.toCharArray());
		try {
			int next = scanner.getNextToken();
			while (next == ITerminalSymbols.TokenNameCOMMENT_LINE
					|| next == ITerminalSymbols.TokenNameCOMMENT_PHPDOC
					|| next == ITerminalSymbols.TokenNameCOMMENT_BLOCK) {
				next = scanner.getNextToken();
			}
			return next == ITerminalSymbols.TokenNameEOF;
		} catch (InvalidInputException e) {
		}
		return false;
	}

}