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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.tomakehurst.wiremock.common;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.io.Files;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.net.URI;
import java.util.List;

import static com.google.common.base.Charsets.UTF_8;
import static com.google.common.collect.Iterables.transform;
import static com.google.common.collect.Lists.newArrayList;

public abstract class AbstractFileSource implements FileSource {

    protected final File rootDirectory;
    
    public AbstractFileSource(File rootDirectory) {
        this.rootDirectory = rootDirectory;
    }

    protected abstract boolean readOnly();

    @Override
    public BinaryFile getBinaryFileNamed(final String name) {
        return new BinaryFile(new File(rootDirectory, name).toURI());
    }

    @Override
    public TextFile getTextFileNamed(String name) {
        return new TextFile(new File(rootDirectory, name).toURI());
    }

    @Override
    public void createIfNecessary() {
        assertWritable();
        if (rootDirectory.exists() && rootDirectory.isFile()) {
            throw new IllegalStateException(rootDirectory + " already exists and is a file");
        } else if (!rootDirectory.exists()) {
            rootDirectory.mkdirs();
        }
    }

    @Override
    public String getPath() {
    	return rootDirectory.getPath();
    }

    @Override
    public URI getUri() {
        return rootDirectory.toURI();
    }

    @Override
    public List listFilesRecursively() {
    	assertExistsAndIsDirectory();
    	List fileList = newArrayList();
    	recursivelyAddFilesToList(rootDirectory, fileList);
    	return toTextFileList(fileList);
    }

    private void recursivelyAddFilesToList(File root, List fileList) {
    	File[] files = root.listFiles();
    	for (File file: files) {
    		if (file.isDirectory()) {
    			recursivelyAddFilesToList(file, fileList);
    		} else {
    			fileList.add(file);
    		}
    	}
    }

    private List toTextFileList(List fileList) {
    	return newArrayList(transform(fileList, new Function() {
    		public TextFile apply(File input) {
    			return new TextFile(input.toURI());
    		}
    	}));
    }

    @Override
    public void writeTextFile(String name, String contents) {
    	writeTextFileAndTranslateExceptions(contents, writableFileFor(name));
    }

    @Override
    public void writeBinaryFile(String name, byte[] contents) {
        writeBinaryFileAndTranslateExceptions(contents, writableFileFor(name));
    }

    @Override
    public void deleteFile(String name) {
        writableFileFor(name).delete();
    }

    @Override
    public boolean exists() {
        return rootDirectory.exists();
    }

    private File writableFileFor(String name) {
        assertExistsAndIsDirectory();
        assertWritable();
        return new File(rootDirectory, name);
    }

    private void assertExistsAndIsDirectory() {
        if (rootDirectory.exists() && !rootDirectory.isDirectory()) {
            throw new RuntimeException(rootDirectory + " is not a directory");
        } else if (!rootDirectory.exists()) {
            throw new RuntimeException(rootDirectory + " does not exist");
        }
    }

    private void assertWritable() {
        if (readOnly()) {
            throw new UnsupportedOperationException("Can't write to read only file sources");
        }
    }

    private void writeTextFileAndTranslateExceptions(String contents, File toFile) {
        try {
            Files.write(contents, toFile, UTF_8);
        } catch (IOException ioe) {
            throw new RuntimeException(ioe);
        }
    }

    private void writeBinaryFileAndTranslateExceptions(byte[] contents, File toFile) {
        try {
            Files.write(contents, toFile);
        } catch (IOException ioe) {
            throw new RuntimeException(ioe);
        }
    }

    private FileFilter filesOnly() {
    	return new FileFilter() {
    		public boolean accept(File file) {
    			return file.isFile();
    		}
    	};
    }

    public static Predicate byFileExtension(final String extension) {
        return new Predicate() {
            public boolean apply(BinaryFile input) {
                return input.name().endsWith("." + extension);
            }
        };
    }

}