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package lombok.core.debug;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;

import org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration;

public class DebugSnapshotStore {
	public static final DebugSnapshotStore INSTANCE = new DebugSnapshotStore();
	public static boolean GLOBAL_DSS_DISABLE_SWITCH = true;
	
	private final Map> map =
			new WeakHashMap>();
	
	public void snapshot(CompilationUnitDeclaration owner, String message, Object... params) {
		if (GLOBAL_DSS_DISABLE_SWITCH) return;
		DebugSnapshot snapshot = new DebugSnapshot(owner, 1, message, params);
		List list;
		
		synchronized (map) {
			list = map.get(owner);
			if (list == null) {
				list = new ArrayList();
				map.put(owner, list);
				list.add(snapshot);
			} else if (!list.isEmpty()) {
				list.add(snapshot);
			} else {
				// An empty list is an indicator that we no longer care about that particular CUD.
			}
		}
	}
	
	public void log(CompilationUnitDeclaration owner, String message, Object... params) {
		if (GLOBAL_DSS_DISABLE_SWITCH) return;
		DebugSnapshot snapshot = new DebugSnapshot(owner, -1, message, params);
		List list;
		
		synchronized (map) {
			list = map.get(owner);
			if (list == null) {
				list = new ArrayList();
				map.put(owner, list);
				list.add(snapshot);
			} else if (!list.isEmpty()) {
				list.add(snapshot);
			} else {
				// An empty list is an indicator that we no longer care about that particular CUD.
			}
		}
	}
	
	public String print(CompilationUnitDeclaration owner, String message, Object... params) {
		if (GLOBAL_DSS_DISABLE_SWITCH) return null;
		List list;
		
		synchronized (map) {
			snapshot(owner, message == null ? "Printing" : message, params);
			list = new ArrayList();
			list.addAll(map.get(owner));
			if (list.isEmpty()) return null; // An empty list is an indicator that we no longer care about that particular CUD.
			map.get(owner).clear();
		}
		
		Collections.sort(list);
		int idx = 1;
		StringBuilder out = new StringBuilder();
		out.append("---------------------------\n");
		for (DebugSnapshot snapshot : list) {
			out.append(String.format("%3d: %s\n", idx++, snapshot.shortToString()));
		}
		out.append("******\n");
		idx = 1;
		for (DebugSnapshot snapshot : list) {
			out.append(String.format("%3d: %s", idx++, snapshot.toString()));
		}
		
		try {
			File logFile = new File(System.getProperty("user.home", "."), String.format("lombok164-%d.err", System.currentTimeMillis()));
			OutputStream stream = new FileOutputStream(logFile);
			try {
				stream.write(out.toString().getBytes("UTF-8"));
			} finally {
				stream.close();
			}
			return logFile.getAbsolutePath();
		} catch (Exception e) {
			System.err.println(out);
			return "(can't write log file - emitted to system err)";
		}
	}
}