#include <jni.h>
#include "org_gvsig_addo_Jaddo.h"
#include "gdal.h"
#include "cpl_string.h"

jobject *jni_obj;
JNIEnv *jni_env;


int incrementFnc( double dfComplete, const char *pszMessage, void * pProgressArg ) {
	jclass class_incr;
	jmethodID method;
	int value = 0;

	value = (int)(dfComplete * 100);
	class_incr = (*jni_env)->FindClass (jni_env, "org/gvsig/addo/IOverviewIncrement");

	method = (*jni_env)->GetMethodID(jni_env, class_incr, "setPercent", "(I)V");
	(*jni_env)->CallVoidMethod(jni_env, (*jni_obj), method, value);
  return 1;
}

JNIEXPORT jint JNICALL Java_org_gvsig_addo_Jaddo_buildOverviewsNative
  (JNIEnv *env, jobject obj, jint method, jstring file, jintArray values) {
  	int err = 0;
  	jsize lon = 0;
	int i = 0;
  	jint *listValues = NULL;
  	GDALDatasetH *poDataset;
  	int anLevels[1024];
  	const char * pszResampling = "nearest";
	const char *filename = (*env)->GetStringUTFChars(env, file, 0);
	lon = (*env)->GetArrayLength(env, values);

	jni_obj = &obj;
  	jni_env = env;

  	listValues = (*env)->GetIntArrayElements(env, values, 0);

  	for (i = 0; i < lon; i++) {
		anLevels[i] = listValues[i];
	}

  	switch(method) {
  		case 0: pszResampling = "nearest"; break;
  		case 1: pszResampling = "average"; break;
  		case 2: pszResampling = "average_mp"; break;
  		case 3: pszResampling = "average_magphase"; break;
  		case 4: pszResampling = "mode"; break;
  	}

  	GDALAllRegister();
    poDataset = GDALOpen( filename, GA_Update );

    if( poDataset == NULL )
        poDataset = GDALOpen( filename, GA_ReadOnly );

    if( poDataset == NULL ) {
    	(*env)->ReleaseIntArrayElements(env, values, listValues, 0);
    	(*env)->ReleaseStringUTFChars(env, file, filename);
        return CE_Fatal;
    }

	err = GDALBuildOverviews( poDataset, pszResampling,
                            lon, anLevels, 0, NULL,
                            incrementFnc, NULL );
    if( err != CE_None ) {
		(*env)->ReleaseIntArrayElements(env, values, listValues, 0);
		(*env)->ReleaseStringUTFChars(env, file, filename);
        return err;
    }
	GDALClose(poDataset);
    GDALDestroyDriverManager();

    (*env)->ReleaseIntArrayElements(env, values, listValues, 0);
    (*env)->ReleaseStringUTFChars(env, file, filename);

    return -1;
}