/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package jdk.jshell;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Set;

import java.util.regex.Matcher;

import java.util.stream.Collectors;

import jdk.jshell.Wrap.CompoundWrap;

import static jdk.jshell.Util.PREFIX_PATTERN;

import static jdk.jshell.Util.REPL_CLASS_PREFIX;

import static jdk.jshell.Util.REPL_DOESNOTMATTER_CLASS_NAME;

import static jdk.jshell.Util.asLetters;

/**

 *

 * @author Robert Field

 */

class OuterWrapMap {

    private final JShell state;

    private final Map<String,OuterSnippetsClassWrap> classOuters = new HashMap<>();

    OuterWrapMap(JShell state) {

        this.state = state;

    }

    OuterSnippetsClassWrap getOuter(String className) {

        Matcher matcher = PREFIX_PATTERN.matcher(className);

        String cn;

        if (matcher.find() && (cn = matcher.group("class")) != null) {

            return classOuters.get(cn);

        }

        return null;

    }

    private CompoundWrap wrappedInClass(String className, String imports, List<Wrap> wraps) {

        List<Object> elems = new ArrayList<>(wraps.size() + 2);

        elems.add(imports +

                "class " + className + " {\n");

        elems.addAll(wraps);

        elems.add("}\n");

        return new CompoundWrap(elems.toArray());

    }

    OuterWrap wrapInClass(Set<Key> except, Collection<Snippet> plus,

            List<Snippet> snippets, List<Wrap> wraps) {

        String imports = state.maps.packageAndImportsExcept(except, plus);

        // className is unique to the set of snippets and their version (seq)

        String className = REPL_CLASS_PREFIX + snippets.stream()

                .sorted((sn1, sn2) -> sn1.key().index() - sn2.key().index())

                .map(sn -> "" + sn.key().index() + asLetters(sn.sequenceNumber()))

                .collect(Collectors.joining("_"));

        CompoundWrap w = wrappedInClass(className, imports, wraps);

        OuterSnippetsClassWrap now = new OuterSnippetsClassWrap(className, w, snippets, wraps);

        classOuters.put(className, now);

        return now;

    }

    OuterWrap wrapInTrialClass(Wrap wrap) {

        String imports = state.maps.packageAndImportsExcept(null, null);

        CompoundWrap w = wrappedInClass(REPL_DOESNOTMATTER_CLASS_NAME, imports,

                Collections.singletonList(wrap));

        return new OuterWrap(w);

    }

    OuterWrap wrapImport(Wrap guts, Snippet sn) {

        return new OuterImportSnippetWrap(guts, sn);

    }

}