#include "jni.h"
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "log.h"

#include "utils.h"

CGFloat MathUtils_dist(CGFloat x1, CGFloat y1, CGFloat x2, CGFloat y2) {
    const CGFloat x = (x2 - x1);
    const CGFloat y = (y2 - y1);
    return (CGFloat) hypot(x, y);
 }
void _CGDataProviderReleaseBytePointerCallback(void *info,const void *pointer) {
}

char** convert_to_char_array(JNIEnv *env, jobjectArray jstringArray) {
	int num_rows = (*env)->GetArrayLength(env, jstringArray);
	char **cArray = (char **) malloc((num_rows + 1) * sizeof(char*));
	jstring row;
	
	for (int i = 0; i < num_rows; i++) {
		row = (jstring) (*env)->GetObjectArrayElement(env, jstringArray, i);
		cArray[i] = (char*)(*env)->GetStringUTFChars(env, row, 0);
    }
    cArray[num_rows] = NULL;
	
    return cArray;
}

jobjectArray convert_from_char_array(JNIEnv *env, char **charArray, int num_rows) {
	jobjectArray resultArr = (*env)->NewObjectArray(env, num_rows, (*env)->FindClass(env, "java/lang/String"), NULL);
	jstring row;
	
	for (int i = 0; i < num_rows; i++) {
		row = (jstring) (*env)->NewStringUTF(env, charArray[i]);
		(*env)->SetObjectArrayElement(env, resultArr, i, row);
    }

	return resultArr;
}

void free_char_array(JNIEnv *env, jobjectArray jstringArray, char **charArray) {
	int num_rows = (*env)->GetArrayLength(env, jstringArray);
	jstring row;
	
	for (int i = 0; i < num_rows; i++) {
		row = (jstring) (*env)->GetObjectArrayElement(env, jstringArray, i);
		(*env)->ReleaseStringUTFChars(env, row, charArray[i]);
	}
	
	free(charArray);
}

CGFloat dpToPx(CGFloat dp) {
	CGFloat screenScale = [[UIScreen mainScreen] scale];
	return dp * screenScale;
}

CGFloat pxToDp(CGFloat px) {
	CGFloat screenScale = [[UIScreen mainScreen] scale];
	return px / screenScale;
}

jstring convertStringJVM(JNIEnv* srcEnv, JNIEnv* dstEnv, jstring srcStr) {
    if (srcStr == NULL) {
        return NULL;
    }
    
    const char* srcStrC = (*srcEnv)->GetStringUTFChars(srcEnv, srcStr, 0);
    jstring dstStr = (*dstEnv)->NewStringUTF(dstEnv, srcStrC);
	(*srcEnv)->ReleaseStringUTFChars(srcEnv, srcStr, srcStrC);
    return dstStr;
}

JNIEXPORT void JNICALL Java_net_kdt_pojavlaunch_utils_JREUtils_setLdLibraryPath(JNIEnv *env, jclass clazz, jstring ldLibraryPath) {
	// jclass exception_cls = (*env)->FindClass(env, "java/lang/UnsatisfiedLinkError");
	
	const char* ldLibPathUtf = (*env)->GetStringUTFChars(env, ldLibraryPath, 0);
    setenv("LD_LIBRARY_PATH", ldLibPathUtf, 1);
	(*env)->ReleaseStringUTFChars(env, ldLibraryPath, ldLibPathUtf);
}

JNIEXPORT jboolean JNICALL Java_net_kdt_pojavlaunch_utils_JREUtils_dlopen(JNIEnv *env, jclass clazz, jstring name) {
	const char *nameUtf = (*env)->GetStringUTFChars(env, name, 0);
	void* handle = dlopen(nameUtf, RTLD_GLOBAL | RTLD_LAZY);
	if (!handle) {
		printf("dlopen %s failed: %s\n", nameUtf, dlerror());
	} else {
		printf("dlopen %s success\n", nameUtf);
	}
	(*env)->ReleaseStringUTFChars(env, name, nameUtf);
	return handle != NULL;
}

JNIEXPORT jint JNICALL Java_net_kdt_pojavlaunch_utils_JREUtils_chdir(JNIEnv *env, jclass clazz, jstring nameStr) {
	const char *name = (*env)->GetStringUTFChars(env, nameStr, NULL);
	int retval = chdir(name);
	(*env)->ReleaseStringUTFChars(env, nameStr, name);
	return retval;
}