package org.eclipse.ganymede.webgen;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

public class ParseLogFile {
	// TODO update the wiki re Ganymede schedule
	// TODO write instructions for contributing
	// TODO write instructions for setting this up on your local machine and
	// build machine
	// TODO pack200
	// TODO web interface to start a new build w/ lockfile to prevent two at
	// once
	// TODO article about using including using for RCP
	public File directory;
	public BufferedReader input;

	public List<LogLine> lines;
	public Status overall_status;
	public String end_time;
	GenerateStatusFile statusFile;

	public static void main(String[] args) throws CloneNotSupportedException {
		(new ParseLogFile()).do_main(args);
	}

	void do_main(String[] args) throws CloneNotSupportedException {
		try {
			this.directory = new File(args[0]);
			this.statusFile = new GenerateStatusFile(this.directory);
			this.input = new BufferedReader(new FileReader(new File(
					this.directory, "log.txt")));
			read_all_lines_into_memory();
			this.input.close();
		} catch (IOException x) {
			try {
				this.statusFile.write_internal_error_status_file(x);
			} catch (IOException xx) {
				// two errors in a row? we'll just give up
				return;
			}
			return;
		}
		scan_for_blame();
		scan_for_status();
		this.statusFile.mark_end_time();
		try {
			write_html_log_files();
		} catch (IOException x) {
			try {
				this.statusFile.write_internal_error_status_file(x);
			} catch (IOException xx) {
				// two errors in a row? we'll just give up
				return;
			}
			return;
		}
		try {
			this.statusFile.write_final_status_file(this.overall_status);
		} catch (IOException xx) {
			// an error writing the status file? I guess we can't write the
			// status file
			return;
		}
	}

	void scan_for_blame() {
		Map<String, Blame> blames = new HashMap<String, Blame>();
		Set<LogLine> subsetlines = new HashSet<LogLine>();
		int state = 0;
		for (Iterator<LogLine> iterator = lines.iterator(); iterator.hasNext();) {
			LogLine line = iterator.next();
			switch (state) {
			case 0:
				subsetlines.add(line);
				Blame b = line.parseBlame();
				if (b != null) {
					state = 1;
					blames.put(b.getKey(), b);
				}
				break;
			case 1:
				b = line.parseBlame();
				if (b != null) {
					blames.put(b.getKey(), b);
				} else {
					for (Iterator<LogLine> iterator2 = subsetlines.iterator(); iterator2
							.hasNext();) {
						LogLine logLine = iterator2.next();
						logLine.assignBlameIfNeeded(blames);
					}
					state = 0;
					subsetlines = new HashSet<LogLine>();
					blames = new HashMap<String, Blame>();
				}
				break;
			}
		}
	}

	void scan_for_status() throws CloneNotSupportedException {
		this.overall_status = Status.unknown;
		for (Iterator<LogLine> iterator = lines.iterator(); iterator.hasNext();) {
			LogLine line = iterator.next();
			this.overall_status = this.overall_status.combine(line
					.scan_for_status());
		}
	}

	void write_html_log_files() throws IOException {
		File outfile = new File(this.directory, "index.html");
		PrintWriter output = new PrintWriter(new BufferedWriter(new FileWriter(
				outfile)));
		write_html_log_header(output);
		write_error_jumps(output);
		write_html_log_lines(output);
		write_html_log_footer(output);
		output.close();
	}

	private void write_html_log_lines(PrintWriter output) {
		for (Iterator<LogLine> iterator = lines.iterator(); iterator.hasNext();) {
			LogLine line = iterator.next();
			line.write_log_line(output);
			output.println("<br>");
		}
	}

	private void write_error_jumps(PrintWriter output) {
		List<LogLine> anchoredLines = new ArrayList<LogLine>();
		boolean previousLineHadAnchor = false;
		Blame previousBlame = null;
		for (Iterator<LogLine> iterator = lines.iterator(); iterator.hasNext();) {
			LogLine line = iterator.next();
			if (line.getAnchor() != null) {
				if( previousLineHadAnchor
						&& line.getBlame() == previousBlame ) {
					// skip
				} else {
					anchoredLines.add(line);
				}
				previousLineHadAnchor = true;
				previousBlame = line.getBlame();
			} else {
				previousLineHadAnchor = false;
			}
		}
		if (!anchoredLines.isEmpty()) {
			Map<Object, List<LogLine>> anchoredLinesByBlame = new HashMap<Object, List<LogLine>>();
			Set<Object> blameOrder = new TreeSet<Object>(
					new Comparator<Object>() {
						public int compare(Object a, Object b) {
							if (a instanceof Blame) {
								if (b instanceof Blame) {
									return ((Blame) a)
											.stringForStatusMessage()
											.compareTo(
													((Blame) b)
															.stringForStatusMessage());
								} else {
									return -1;
								}
							} else {
								if (b instanceof Blame) {
									return 1;
								} else {
									return ((String) a).compareTo((String) b);
								}
							}
						}
					});
			for (Iterator<LogLine> iterator = anchoredLines.iterator(); iterator
					.hasNext();) {
				LogLine logLine = (LogLine) iterator.next();
				Blame b = logLine.getBlame();
				List<LogLine> list;
				if (b == null)
					list = anchoredLinesByBlame.get("(other)");
				else
					list = anchoredLinesByBlame.get(logLine.getBlame());
				if (list == null) {
					list = new ArrayList<LogLine>();
					Object k;
					if (b == null)
						k = "(other)";
					else
						k = logLine.getBlame();
					blameOrder.add(k);
					anchoredLinesByBlame.put(k, list);
				}
				list.add(logLine);
			}
			output.println("<p>Errors: <ul>");
			for (Iterator<Object> keysiterator = blameOrder.iterator(); keysiterator
					.hasNext();) {
				Object key = keysiterator.next();
				output.print("<li>");
				if (key instanceof Blame)
					output.println(((Blame) key).stringForStatusMessage());
				else
					output.println(key);
				for (Iterator<LogLine> iterator = anchoredLinesByBlame.get(key)
						.iterator(); iterator.hasNext();) {
					LogLine line = iterator.next();
					output.println("<a href=\"#" + line.getAnchor()
							+ "\"><span style=\"background-color: "
							+ WebPageColors.fail_color() + "\">"
							+ line.linenumber + "</span></a> ");
				}
				output.println("</li>");
			}
			output.println("</ul>");
		}
	}

	private void write_html_log_footer(PrintWriter output) {
		output.println("<p><em><font size=-1>Build started "
				+ this.statusFile.start_time + "; completed "
				+ this.statusFile.end_time + "</font></em></p>\n");
		output.println("</body>\n");
		output.println("</html>\n");
	}

	private void write_html_log_header(PrintWriter output) {
		output.println("<html>\n");
		output.println("<head>\n");
		output.println("<title>Ganymede Build Log</title>\n");
		output
				.println("<link rel=\"stylesheet\" type=\"text/css\" href=\"http://www.eclipse.org/eclipse.org-common/themes/Phoenix/css/visual.css\" media=\"screen\" />\n");
		output.println("</head><body>\n");
		output
				.println("<table width=\"100%\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\n");
		output
				.println("<tr style=\"background-image: url(http://dash.eclipse.org/dash/commits/web-app/header_bg.gif);\">\n");
		output.println("<td>\n");
		output
				.println("<a href=\"http://www.eclipse.org/\"><img src=\"http://dash.eclipse.org/dash/commits/web-app/header_logo.gif\" width=\"163\" height=\"68\" border=\"0\" alt=\"Eclipse Logo\" class=\"logo\" /></a>\n");
		output.println("</td>\n");
		output
				.println("<td align=\"right\" style=\"color: white; font-family: verdana,arial,helvetica; font-size: 1.25em; font-style: italic;\"><b>Ganymede Build Log&nbsp;</b></font> </td>\n");
		output.println("</tr>\n");
		output.println("</table>\n");
		output.println("<p><em><font size=-1>Build started "
				+ this.statusFile.start_time + "; completed "
				+ this.statusFile.end_time + "</font></em></p>\n");
		output.println("<h1 style=\"background-color: "
				+ overall_status.color() + "\">Ganymede Build Log</h1>\n");
	}

	void read_all_lines_into_memory() throws IOException {
		lines = new ArrayList<LogLine>();
		String line = input.readLine();
		int num = 1;
		while (line != null) {
			LogLine logline = new LogLine(line, num++);
			lines.add(logline);
			line = input.readLine();
		}
	}

}