/*
 * Copyright 2011 gitblit.com.
 *
 * 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.gitblit;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.net.URL;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import com.gitblit.utils.StringUtils;

public class Build {

	public static enum BuildType {
		RUNTIME, COMPILETIME;
	}

	public static void main(String... args) {
		runtime();
		compiletime();
		buildSettingKeys();
	}

	public static void runtime() {
		downloadFromApache(MavenObject.JCOMMANDER, BuildType.RUNTIME);
		downloadFromApache(MavenObject.JETTY, BuildType.RUNTIME);
		downloadFromApache(MavenObject.SERVLET, BuildType.RUNTIME);
		downloadFromApache(MavenObject.SLF4JAPI, BuildType.RUNTIME);
		downloadFromApache(MavenObject.SLF4LOG4J, BuildType.RUNTIME);
		downloadFromApache(MavenObject.LOG4J, BuildType.RUNTIME);
		downloadFromApache(MavenObject.WICKET, BuildType.RUNTIME);
		downloadFromApache(MavenObject.WICKET_EXT, BuildType.RUNTIME);
		downloadFromApache(MavenObject.WICKET_AUTH_ROLES, BuildType.RUNTIME);
		downloadFromApache(MavenObject.WICKET_GOOGLE_CHARTS, BuildType.RUNTIME);
		downloadFromApache(MavenObject.MARKDOWNPAPERS, BuildType.RUNTIME);
		downloadFromApache(MavenObject.BOUNCYCASTLE, BuildType.RUNTIME);
		downloadFromApache(MavenObject.BOUNCYCASTLE_MAIL, BuildType.RUNTIME);

		downloadFromEclipse(MavenObject.JGIT, BuildType.RUNTIME);
		downloadFromEclipse(MavenObject.JGIT_HTTP, BuildType.RUNTIME);
	}

	public static void compiletime() {
		downloadFromApache(MavenObject.JUNIT, BuildType.RUNTIME);
		downloadFromApache(MavenObject.JCOMMANDER, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.JETTY, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.SERVLET, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.SLF4JAPI, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.SLF4LOG4J, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.LOG4J, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.WICKET, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.WICKET_EXT, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.WICKET_AUTH_ROLES, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.WICKET_GOOGLE_CHARTS, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.MARKDOWNPAPERS, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.BOUNCYCASTLE, BuildType.COMPILETIME);
		downloadFromApache(MavenObject.BOUNCYCASTLE_MAIL, BuildType.COMPILETIME);
		
		downloadFromEclipse(MavenObject.JGIT, BuildType.COMPILETIME);
		downloadFromEclipse(MavenObject.JGIT_HTTP, BuildType.COMPILETIME);
	}

	public static void buildSettingKeys() {
		// Load all keys
		Properties properties = new Properties();
		try {
			properties.load(new FileInputStream(Constants.PROPERTIES_FILE));
		} catch (Throwable t) {
			t.printStackTrace();
		}
		List<String> keys = new ArrayList<String>(properties.stringPropertyNames());
		Collections.sort(keys);

		// Determine static key group classes
		Map<String, List<String>> staticClasses = new HashMap<String, List<String>>();
		staticClasses.put("", new ArrayList<String>());
		for (String key : keys) {
			String clazz = "";
			String field = key;
			if (key.indexOf('.') > -1) {
				clazz = key.substring(0, key.indexOf('.'));
				field = key.substring(key.indexOf('.') + 1);
			}
			if (!staticClasses.containsKey(clazz)) {
				staticClasses.put(clazz, new ArrayList<String>());
			}
			staticClasses.get(clazz).add(field);
		}

		// Assemble Keys source file
		StringBuilder sb = new StringBuilder();
		sb.append("package com.gitblit;\n");
		sb.append("\n");
		sb.append("/*\n");
		sb.append(" * This class is auto-generated from the properties file.\n");
		sb.append(" * Do not version control!\n");
		sb.append(" */\n");
		sb.append("public final class Keys {\n");
		sb.append("\n");
		List<String> classSet = new ArrayList<String>(staticClasses.keySet());
		Collections.sort(classSet);
		for (String clazz : classSet) {
			List<String> keySet = staticClasses.get(clazz);
			if (clazz.equals("")) {
				// root keys
				for (String key : keySet) {
					sb.append(MessageFormat.format("\tpublic static final String {0} = \"{1}\";\n\n", key.replace('.', '_'), key));
				}
			} else {
				// class keys
				sb.append(MessageFormat.format("\tpublic static final class {0} '{'\n\n", clazz));
				sb.append(MessageFormat.format("\t\tpublic static final String _ROOT = \"{0}\";\n\n", clazz));
				for (String key : keySet) {
					sb.append(MessageFormat.format("\t\tpublic static final String {0} = \"{1}\";\n\n", key.replace('.', '_'), clazz + "." + key));
				}
				sb.append("\t}\n\n");
			}
		}
		sb.append("}");

		// Save Keys class definition
		try {
			File file = new File("src/com/gitblit/Keys.java");
			file.delete();
			RandomAccessFile raf = new RandomAccessFile(file, "rw");
			raf.writeBytes(sb.toString());
			raf.close();
		} catch (Throwable t) {
			t.printStackTrace();
		}
	}

	/**
	 * Download a file from the official Apache Maven repository.
	 * 
	 * @param mo
	 *            the maven object to download.
	 * @return
	 */
	private static List<File> downloadFromApache(MavenObject mo, BuildType type) {
		return downloadFromMaven("http://repo1.maven.org/maven2/", mo, type);
	}

	/**
	 * Download a file from the official Eclipse Maven repository.
	 * 
	 * @param mo
	 *            the maven object to download.
	 * @return
	 */
	private static List<File> downloadFromEclipse(MavenObject mo, BuildType type) {
		return downloadFromMaven("http://download.eclipse.org/jgit/maven/", mo, type);
	}

	/**
	 * Download a file from a Maven repository.
	 * 
	 * @param mo
	 *            the maven object to download.
	 * @return
	 */
	private static List<File> downloadFromMaven(String mavenRoot, MavenObject mo, BuildType type) {
		List<File> downloads = new ArrayList<File>();
		String[] jars = { "" };
		if (BuildType.RUNTIME.equals(type)) {
			jars = new String[] { "" };
		} else if (BuildType.COMPILETIME.equals(type)) {
			jars = new String[] { "-sources", "-javadoc" };
		}
		for (String jar : jars) {
			File targetFile = mo.getLocalFile("ext", jar);
			if (targetFile.exists()) {
				downloads.add(targetFile);
				continue;
			}
			String expectedSHA1 = mo.getSHA1(jar);
			if (expectedSHA1 == null) {
				// skip this jar
				continue;
			}
			float approximateLength = mo.getApproximateLength(jar);
			String mavenURL = mavenRoot + mo.getRepositoryPath(jar);
			if (!targetFile.getAbsoluteFile().getParentFile().exists()) {
				boolean success = targetFile.getAbsoluteFile().getParentFile().mkdirs();
				if (!success) {
					throw new RuntimeException("Failed to create destination folder structure!");
				}
			}
			ByteArrayOutputStream buff = new ByteArrayOutputStream();
			try {
				URL url = new URL(mavenURL);
				InputStream in = new BufferedInputStream(url.openStream());
				byte[] buffer = new byte[4096];
				int downloadedLen = 0;
				float lastProgress = 0f;
				
				updateDownload(0, targetFile);
				while (true) {
					int len = in.read(buffer);
					if (len < 0) {
						break;
					}
					downloadedLen += len;
					buff.write(buffer, 0, len);
					float progress = downloadedLen / approximateLength;
					if (progress - lastProgress >= 0.1f) {
						lastProgress = progress;
						updateDownload(progress, targetFile);
					}
				}
				in.close();
				updateDownload(1f, targetFile);
				
			} catch (IOException e) {
				throw new RuntimeException("Error downloading " + mavenURL + " to " + targetFile, e);
			}
			byte[] data = buff.toByteArray();
			String calculatedSHA1 = StringUtils.getSHA1(data);

			System.out.println();

			if (expectedSHA1.length() == 0) {
				updateProgress(0, "sha: " + calculatedSHA1);
				System.out.println();
			} else {
				if (!calculatedSHA1.equals(expectedSHA1)) {
					throw new RuntimeException("SHA1 checksum mismatch; got: " + calculatedSHA1);
				}
			}
			try {
				RandomAccessFile ra = new RandomAccessFile(targetFile, "rw");
				ra.write(data);
				ra.setLength(data.length);
				ra.close();
			} catch (IOException e) {
				throw new RuntimeException("Error writing to file " + targetFile, e);
			}
			downloads.add(targetFile);
		}
		return downloads;
	}
	
	private static void updateDownload(float progress, File file) {
		updateProgress(progress, "d/l: " + file.getName());
	}

	private static void updateProgress(float progress, String url) {
		String anim = "==========";
		int width = Math.round(anim.length() * progress);
		System.out.print("\r[");
		System.out.print(anim.substring(0, width));
		for (int i = 0; (i < anim.length() - width); i++) {
			System.out.print(" ");
		}
		System.out.print("] " + url);
	}

	private static class MavenObject {

		public static final MavenObject JCOMMANDER = new MavenObject("jCommander", "com/beust", "jcommander", "1.17", 34000, 32000, 141000, "219a3540f3b27d7cc3b1d91d6ea046cd8723290e", "0bb50eec177acf0e94d58e0cf07262fe5164331d", "c7adc475ca40c288c93054e0f4fe58f3a98c0cb5");

		public static final MavenObject JETTY = new MavenObject("Jetty", "org/eclipse/jetty/aggregate", "jetty-all", "7.4.1.v20110513", 1500000, 1000000, 4100000, "1e2de9ed25a7c6ae38717d5ffdc7cfcd6be4bd46", "7b6279d16ce8f663537d9faf55ea353e748dbbaa", "fa06212e751296f1a7abc15c843b135bf49a112b");

		public static final MavenObject SERVLET = new MavenObject("Servlet 2.5", "javax/servlet", "servlet-api", "2.5", 105000, 158000, 0, "5959582d97d8b61f4d154ca9e495aafd16726e34", "021599814ad9a605b86f3e6381571beccd861a32", null);

		public static final MavenObject SLF4JAPI = new MavenObject("SLF4J API", "org/slf4j", "slf4j-api", "1.6.1", 25500, 45000, 182000, "6f3b8a24bf970f17289b234284c94f43eb42f0e4", "46a386136c901748e6a3af67ebde6c22bc6b4524", "e223571d77769cdafde59040da235842f3326453");

		public static final MavenObject SLF4LOG4J = new MavenObject("SLF4J LOG4J", "org/slf4j", "slf4j-log4j12", "1.6.1", 9800, 9500, 52400, "bd245d6746cdd4e6203e976e21d597a46f115802", "7a26b08b265f55622fa1fed3bda68bbd37a465ba", "6e4b16bce7994e3692e82002f322a0dd2f32741e");

		public static final MavenObject LOG4J = new MavenObject("Apache LOG4J", "log4j", "log4j", "1.2.16", 481000, 471000, 1455000, "7999a63bfccbc7c247a9aea10d83d4272bd492c6", "bf945d1dc995be7fe64923625f842fbb6bf443be", "78aa1cbf0fa3b259abdc7d87f9f6788d785aac2a");

		public static final MavenObject WICKET = new MavenObject("Apache Wicket", "org/apache/wicket", "wicket", "1.4.17", 1960000, 1906000, 6818000, "39815e37a6f56465b2d2c3d3017c4f3bf17db50a", "a792ebae4123253ffd039c3be49e773f8622f94e", "f2f244ca72d10081529b017e89d6276eab62c621");

		public static final MavenObject WICKET_EXT = new MavenObject("Apache Wicket Extensions", "org/apache/wicket", "wicket-extensions", "1.4.17", 1180000, 1118000, 1458000, "01111d0dbffdc425581b006a43864c22797ce72a", "f194f40ea6e361bb745dfa22e2f9171eb63a9355", "bd42e5ba9444a426bb2d7cacce91c6033b663b57");

		public static final MavenObject WICKET_AUTH_ROLES = new MavenObject("Apache Wicket Auth Roles", "org/apache/wicket", "wicket-auth-roles", "1.4.17", 44000, 45000, 166000, "86d20ff32f62d3026213ff11a78555da643bc676", "37e815350a2d6b97734b250a8a03d8bf3712bba7", "ac3896368bfb372d178041a4ac3ee2c44f62e21c");

		public static final MavenObject WICKET_GOOGLE_CHARTS = new MavenObject("Apache Wicket Google Charts Add-On", "org/wicketstuff", "googlecharts", "1.4.17", 34000, 18750, 161000, "c567b98b0c5efe4147e77ef2d0d3c2d45c49dea5", "3d32d958b2f7aa58388af5701ea3aafc433e573f", "c37518b67ea85af485dd61fe854137eeacc50318");

		public static final MavenObject JUNIT = new MavenObject("JUnit", "junit", "junit", "3.8.2", 120000, 0, 0, "07e4cde26b53a9a0e3fe5b00d1dbbc7cc1d46060", "", "");

		public static final MavenObject MARKDOWNPAPERS = new MavenObject("MarkdownPapers", "org/tautua/markdownpapers", "markdownpapers-core", "1.0.0", 87000, 58000, 278000, "feda63bd149f3315da210e397d45d02277038ad5", "a9a6c4d163af81e265a15138fcaeafa9829c6054", "f932656266a7f9593488d3f89e815d0af44d0853");
		
		public static final MavenObject BOUNCYCASTLE = new MavenObject("BouncyCastle", "org/bouncycastle", "bcprov-jdk16", "1.46", 1900000, 1400000, 4670000, "ce091790943599535cbb4de8ede84535b0c1260c", "d2b70567594225923450d7e3f80cd022c852725e", "873a6fe765f33fc27df498a5d1f5bf077e503b2f");
		
		public static final MavenObject BOUNCYCASTLE_MAIL = new MavenObject("BouncyCastle Mail", "org/bouncycastle", "bcmail-jdk16", "1.46", 502000, 420000, 482000, "08a9233bfd6ad38ea32df5e6ff91035b650584b9", "3ebd62bc56854767512dc5deec0a17795f2e671d", "3b7c5f3938f202311bdca0bf7ed46bc0118af081");

		public static final MavenObject JGIT = new MavenObject("JGit", "org/eclipse/jgit", "org.eclipse.jgit", "0.12.1", 1318000, 1354000, 2993000, "fd77699699b9651d2fc31c7ed63af98b14fc1975", "c8b3d84922c7802cfe6a661e13a002641a78583d", "5609aa3ce3ac3d52030befd27ddd2941f6c07570");

		public static final MavenObject JGIT_HTTP = new MavenObject("JGit", "org/eclipse/jgit", "org.eclipse.jgit.http.server", "0.12.1", 68000, 62000, 99000, "384058ca906dffb8b8708c2db8849c9754359b28", "7b026658ed8de2eccc2d11d647d43d7c84a56911", "6c19e37b3caafd70c1b7b024ae1858c725181688");

		public final String name;
		public final String group;
		public final String artifact;
		public final String version;
		public final int len_library;
		public final int len_sources;
		public final int len_javadoc;
		public final String sha1_library;
		public final String sha1_sources;
		public final String sha1_javadoc;

		private MavenObject(String name, String group, String artifact, String version, int len_library, int len_sources, int len_javadoc, String sha1_library, String sha1_sources, String sha1_javadoc) {
			this.name = name;
			this.group = group;
			this.artifact = artifact;
			this.version = version;
			this.len_library = len_library;
			this.len_sources = len_sources;
			this.len_javadoc = len_javadoc;
			this.sha1_library = sha1_library;
			this.sha1_sources = sha1_sources;
			this.sha1_javadoc = sha1_javadoc;
		}

		private String getRepositoryPath(String jar) {
			return group + "/" + artifact + "/" + version + "/" + artifact + "-" + version + jar + ".jar";
		}

		private File getLocalFile(String basePath, String jar) {
			return new File(basePath, artifact + "-" + version + jar + ".jar");
		}

		private String getSHA1(String jar) {
			if (jar.equals("")) {
				return sha1_library;
			} else if (jar.equals("-sources")) {
				return sha1_sources;
			} else if (jar.equals("-javadoc")) {
				return sha1_javadoc;
			}
			return sha1_library;
		}

		private int getApproximateLength(String jar) {
			if (jar.equals("")) {
				return len_library;
			} else if (jar.equals("-sources")) {
				return len_sources;
			} else if (jar.equals("-javadoc")) {
				return len_javadoc;
			}
			return len_library;
		}

		@Override
		public String toString() {
			return name;
		}
	}
}