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/*The MIT License (MIT)

Copyright (c) 2019 Muhammad Hammad

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Sogiftware.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.*/


package org.dvare.dynamic.resources;

import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileObject.Kind;
import javax.tools.StandardLocation;
import java.io.IOException;
import java.util.*;


public class MemoryFileManager extends ForwardingJavaFileManager {

    private final DynamicClassLoader classLoader;
    private final JavaClassesFinder finder;

    public MemoryFileManager(JavaFileManager standardJavaFileManager, DynamicClassLoader classLoader) {
        super(standardJavaFileManager);
        this.classLoader = classLoader;
        classLoader.getRamFileSystem().put(new LocationAndKind(StandardLocation.CLASS_OUTPUT, Kind.CLASS), new HashMap<>());
        finder = new JavaClassesFinder(classLoader);
    }


    @Override
    public Iterable list(Location location, String packageName, Set kinds,
                                         boolean recurse) throws IOException {


        List result = new ArrayList<>();

        if (location == StandardLocation.PLATFORM_CLASS_PATH) {
            return super.list(location, packageName, kinds, recurse);
        } else if (location == StandardLocation.CLASS_PATH && kinds.contains(Kind.CLASS)) {
            for (JavaFileObject f : super.list(location, packageName, kinds, recurse)) {
                result.add(f);
            }
            result.addAll(finder.listAll(packageName));
        }

        result.addAll(addInMemoryClasses(location, packageName, kinds, recurse));
        return result;
    }

    private List addInMemoryClasses(Location location, String pkg, Set kinds, boolean recurse) {
        Location outPutLocation = location;
        List result = new ArrayList<>();

        if (outPutLocation == StandardLocation.CLASS_PATH) {
            outPutLocation = StandardLocation.CLASS_OUTPUT;
        }

        for (Kind kind : kinds) {
            LocationAndKind key = new LocationAndKind(outPutLocation, kind);
            if (classLoader.getRamFileSystem().containsKey(key)) {
                Map locatedFiles = classLoader.getRamFileSystem().get(key);
                for (Map.Entry entry : locatedFiles.entrySet()) {
                    JavaFileObject processedFile = processLocatedFile(pkg, kinds, recurse, entry);
                    if (processedFile != null) {
                        result.add(processedFile);
                    }
                }
            }
        }

        return result;
    }


    private JavaFileObject processLocatedFile(String pkg, Set kinds, boolean recurse, Map.Entry entry) {
        String name = entry.getKey();
        String packageName = "";
        if (name.indexOf('.') > -1) {
            packageName = name.substring(0, name.lastIndexOf('.'));
        }
        if (recurse ? packageName.startsWith(pkg) : packageName.equals(pkg)) {
            JavaFileObject candidate = entry.getValue();
            if (kinds.contains(candidate.getKind())) {
                return candidate;
            }
        }
        return null;
    }


    @Override
    public boolean hasLocation(Location location) {
        return (location == StandardLocation.SOURCE_PATH
                || location == StandardLocation.CLASS_PATH
                || location == StandardLocation.PLATFORM_CLASS_PATH);
    }

    @Override
    public String inferBinaryName(Location location, JavaFileObject file) {
        if (location == StandardLocation.SOURCE_PATH) {
            return null;
        }
        String fileName = file.getName();
        String classname;
        if (!fileName.contains(".jar!")) {
            classname = fileName.replace('/', '.').replace('\\', '.');
        } else {
            classname = fileName.substring(0, fileName.indexOf(".jar!") + 5) + (fileName.substring(fileName.indexOf(".jar!") + 5).replace('/', '.').replace('\\', '.'));
        }

        classname = classname.substring(0, classname.lastIndexOf(".class"));
        return classname;
    }


}