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package com.md87.charliebravo.commands;

import com.dmdirc.util.Downloader;
import com.md87.charliebravo.Command;
import com.md87.charliebravo.Followup;
import com.md87.charliebravo.InputHandler;
import com.md87.charliebravo.Response;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 *
 * @author chris
 */
public class GitCommand implements Command {

    public void execute(InputHandler handler, Response response, String line) throws Exception {
        if (line.isEmpty()) {
            response.sendMessage("You need to specify a revision", true);
        } else {
            final List<String> result = Downloader.getPage(
                    "http://git.dmdirc.com/cgit.cgi/client/commit/?id="
                    + URLEncoder.encode(line, Charset.defaultCharset().name()));
            final StringBuilder builder = new StringBuilder();

            for (String resline : result) {
                builder.append(resline);
            }

            if (builder.indexOf("<div class=\"error\">Bad object id:") > -1) {
                response.sendMessage("That commit was not found", true);
            } else {
                Matcher matcher = Pattern.compile("<th>author</th>"
                        + "<td>(.*?) &lt;(.*?)&gt;</td><td class='right'>(.*?)</td>")
                        .matcher(builder);
                matcher.find();
                final String authorName = matcher.group(1);
                final String authorEmail = matcher.group(2);
                final String commitDate = matcher.group(3);

                matcher = Pattern.compile("<th>commit</th><td colspan='2' class='sha1'>"
                        + "<a href='/cgit.cgi/client/commit/\\?id=(.*?)'>").matcher(builder);
                matcher.find();
                final String commitHash = matcher.group(1);

                matcher = Pattern.compile("<div class='commit-subject'>(.*?)(<a .*?)?</div>")
                        .matcher(builder);
                matcher.find();
                final String commitSubject = matcher.group(1);
                
                matcher = Pattern.compile("<div class='diffstat-summary'>(.*?)</div>")
                        .matcher(builder);
                matcher.find();
                final String commitDiff = matcher.group(1);

                response.sendMessage("commit " + commitHash + " was made by "
                        + authorName + " with message '" + commitSubject + "'");
                response.addFollowup(new DiffFollowup(commitDiff, commitHash));
                response.addFollowup(new DetailsFollowup(authorName, authorEmail,
                        commitHash, commitDate));
            }
            
        }

    }

    protected static class DiffFollowup implements Followup {

        private final String data;
        private final String hash;

        public DiffFollowup(String data, String hash) {
            this.data = data;
            this.hash = hash;
        }

        public boolean matches(String line) {
            return line.equalsIgnoreCase("diff");
        }

        public void execute(InputHandler handler, Response response, String line) throws Exception {
            response.setInheritFollows(true);
            response.sendMessage("there were " + data.replaceAll("^(.*), (.*?)$", "$1 and $2")
                    + " in commit "
                    + hash + ". See http://git.dmdirc.com/cgit.cgi/client/diff/?id=" + hash);
        }

    }

    protected static class DetailsFollowup implements Followup {

        private final String authorName, authorEmail, hash, time;

        public DetailsFollowup(String authorName, String authorEmail, String hash, String time) {
            this.authorName = authorName;
            this.authorEmail = authorEmail;
            this.hash = hash;
            this.time = time;
        }

        public boolean matches(String line) {
            return line.equalsIgnoreCase("details");
        }

        public void execute(InputHandler handler, Response response, String line) throws Exception {
            response.setInheritFollows(true);
            response.sendMessage("commit " + hash + " was made on " + time + " by "
                    + authorName + " <" + authorEmail + ">. " +
                    "See http://git.dmdirc.com/cgit.cgi/client/commit/?id=" + hash);
        }

    }

}