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package com.undefinedlabs.scope.utils;

import com.undefinedlabs.scope.utils.event.EventKeys;
import com.undefinedlabs.scope.utils.sourcecode.SourceCode;
import com.undefinedlabs.scope.utils.sourcecode.SourceCodeFrame;
import com.undefinedlabs.scope.utils.sourcecode.SourceCodeFrameFactory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public enum StacktraceUtils {
  INSTANCE;

  public Map createStackTraceFields(final StackTraceElement[] stackTraceElements) {
    final Map fields = new HashMap<>();

    final List> eventStackTraceFrame = new ArrayList<>();
    for (StackTraceElement stackElement : stackTraceElements) {
      eventStackTraceFrame.add(this.createExceptionStackTraceFrameFields(stackElement));
    }

    fields.put(EventKeys.Stacktrace.FRAMES, eventStackTraceFrame);

    return Collections.unmodifiableMap(fields);
  }

  private Map createExceptionStackTraceFrameFields(
      final StackTraceElement stackElement) {
    final Map fields = new HashMap<>();
    final SourceCodeFrame sourceCodeFrame =
        SourceCodeFrameFactory.INSTANCE.createFrame(stackElement);
    final SourceCode sourceCode = sourceCodeFrame.getSourceCode();

    fields.put(EventKeys.Stacktrace.Frame.NAME, sourceCodeFrame.getMethodName());
    fields.put(EventKeys.Stacktrace.Frame.MODULE, sourceCode.getClassName());

    if (sourceCodeFrame.getMethodLine() != -1) {
      fields.put(EventKeys.Stacktrace.Frame.FILE, sourceCode.getSourceFilePath());
      fields.put(EventKeys.Stacktrace.Frame.LINE, sourceCodeFrame.getMethodLine());
      fields.put(EventKeys.Stacktrace.Frame.FILE_NAME, stackElement.getFileName());
    }
    fields.put(
        EventKeys.Stacktrace.Frame.JAVA, createExceptionStackTraceFrameJavaFields(stackElement));
    return Collections.unmodifiableMap(fields);
  }

  private Map createExceptionStackTraceFrameJavaFields(
      StackTraceElement stackElement) {
    final Map fields = new HashMap<>();
    fields.put(EventKeys.Stacktrace.Frame.Java.CLASS_NAME, stackElement.getClassName());
    fields.put(EventKeys.Stacktrace.Frame.Java.FILE_NAME, stackElement.getFileName());
    fields.put(EventKeys.Stacktrace.Frame.Java.METHOD_NAME, stackElement.getMethodName());
    fields.put(EventKeys.Stacktrace.Frame.Java.LINE_NUMBER, stackElement.getLineNumber());
    fields.put(EventKeys.Stacktrace.Frame.Java.IS_NATIVE_METHOD, stackElement.isNativeMethod());

    return fields;
  }
}