package net.sourceforge.phpdt.internal.launching;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;

import net.sourceforge.phpdt.internal.core.JavaProject;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.Platform;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILaunch;
import org.eclipse.debug.core.model.IProcess;

public class InterpreterRunner {

	public InterpreterRunner() {
	}

	public IProcess run(InterpreterRunnerConfiguration configuration, ILaunch launch, String[] env) {		
		String commandLine = renderCommandLine(configuration);		
		File workingDirectory = configuration.getAbsoluteWorkingDirectory();

		Process nativePHPProcess = null;
		try {
			nativePHPProcess = configuration.getInterpreter().exec(commandLine, workingDirectory, env);
		} catch (IOException e) {
			throw new RuntimeException("Unable to execute interpreter: " + commandLine + workingDirectory);
		}

		IProcess process = DebugPlugin.newProcess(launch, nativePHPProcess, renderLabel(configuration));
		process.setAttribute(PHPLaunchingPlugin.PLUGIN_ID + ".launcher.cmdline", commandLine);

		return process ;
	}

	protected String renderLabel(InterpreterRunnerConfiguration configuration) {
		StringBuffer buffer = new StringBuffer();

		PHPInterpreter interpreter = configuration.getInterpreter();
		buffer.append("PHP ");
		buffer.append(interpreter.getCommand());
		buffer.append(" : ");
		buffer.append(configuration.getFileName());

		return buffer.toString();
	}

	protected String renderCommandLine(InterpreterRunnerConfiguration configuration) {
		PHPInterpreter interpreter = configuration.getInterpreter();

		StringBuffer buffer = new StringBuffer();
		buffer.append(this.getDebugCommandLineArgument());
	//	buffer.append(renderLoadPath(configuration));
		buffer.append(" " + configuration.getInterpreterArguments());
	//	buffer.append(interpreter.endOfOptionsDelimeter);
		buffer.append(" " + osDependentPath(configuration.getAbsoluteFileName()));
		buffer.append(" " + configuration.getProgramArguments());

		return buffer.toString();
	}

	protected String renderLoadPath(InterpreterRunnerConfiguration configuration) {
		StringBuffer loadPath = new StringBuffer();

		JavaProject project = configuration.getProject();
		addToLoadPath(loadPath, project.getProject());

		Iterator referencedProjects = project.getReferencedProjects().iterator();
		while (referencedProjects.hasNext())
			addToLoadPath(loadPath, (IProject) referencedProjects.next());

		return loadPath.toString();
	}

	protected void addToLoadPath(StringBuffer loadPath, IProject project) {
		loadPath.append(" -I " + osDependentPath(project.getLocation().toOSString()));
	}

	protected String osDependentPath(String aPath) {
		if (Platform.getOS().equals(Platform.OS_WIN32))
			aPath = "\"" + aPath + "\"";

		return aPath;
	}
	
	protected String getDebugCommandLineArgument() {
		return "" ;	
	}	
}