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package net.sourceforge.plantuml.dot;

import java.io.File;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import net.sourceforge.plantuml.StringUtils;

public class GraphvizVersionFinder {
	// ::remove file when __CORE__

	final private File dotExe;
	final public static GraphvizVersion DEFAULT = new GraphvizVersion() {
		public boolean useShieldForQuantifier() {
			return true;
		}

		public boolean useProtectionWhenThereALinkFromOrToGroup() {
			return true;
		}

		public boolean useXLabelInsteadOfLabel() {
			return false;
		}

		public boolean isVizjs() {
			return false;
		}

		public boolean ignoreHorizontalLinks() {
			return false;
		}
	};

	public GraphvizVersionFinder(File dotExe) {
		this.dotExe = dotExe;
	}

	public GraphvizVersion getVersion() {
		final String dotVersion = dotVersion();
		final Pattern p = Pattern.compile("(\\d+)\\.(\\d\\d?)");
		final Matcher m = p.matcher(dotVersion);
		final boolean find = m.find();
		if (find == false)
			return DEFAULT;

		final int major = Integer.parseInt(m.group(1));
		final int minor = Integer.parseInt(m.group(2));
		final int v = 100 * major + minor;
		return new GraphvizVersion() {
			public boolean useShieldForQuantifier() {
				return v <= 228;
			}

			public boolean useProtectionWhenThereALinkFromOrToGroup() {
				if (v == 239 || v == 240) {
					return false;
				}
				// return v < 238;
				return true;
			}

			public boolean useXLabelInsteadOfLabel() {
				return false;
			}

			public boolean isVizjs() {
				return false;
			}

			public boolean ignoreHorizontalLinks() {
				if (v == 230) {
					return true;
				}
				return false;
			}

		};
	}

	public String dotVersion() {
		final String cmd[] = getCommandLine();

		final ProcessRunner p = new ProcessRunner(cmd);
		final ProcessState state = p.run(null, null);
		if (state.differs(ProcessState.TERMINATED_OK()))
			return "?";

		final StringBuilder sb = new StringBuilder();
		if (StringUtils.isNotEmpty(p.getOut()))
			sb.append(p.getOut());

		if (StringUtils.isNotEmpty(p.getError())) {
			if (sb.length() > 0)
				sb.append(' ');

			sb.append(p.getError());
		}
		return StringUtils.trin(sb.toString().replace('\n', ' '));
	}

	private String[] getCommandLine() {
		return new String[] { dotExe.getAbsolutePath(), "-V" };
	}

}