#include <stdio.h>
#include "core/doc_scanner.hpp"
#include "native_structs.h"

//typedef struct {
//    int32_t x;
//    int32_t y;
//} Coordinate;
//
//typedef struct {
//    Coordinate* coordsPtr;
//    uint32_t length;
//} CoordinateArray;

typedef struct {
    int32_t left;
    int32_t top;
    int32_t width;
    int32_t height;
} ROI;

typedef struct {
    uint8_t *buf;
    int32_t height;
    int32_t width;
    const char *format;
    int32_t bytesPerRow;
    ROI *roiPtr;
} NativeCameraImage;

extern "C" __attribute__((visibility("default"))) __attribute__((used))
intptr_t initDocFinder(const char* doc_model_path, const char* corner_model_path, float precise = 0.85) {
    auto *docFinderPtr = new DocScanner(doc_model_path, corner_model_path, precise);
    return (intptr_t)docFinderPtr;
}

extern "C" __attribute__((visibility("default"))) __attribute__((used))
int findDocWithCameraImg(CoordinateArray *coordList, NativeCameraImage *cameraImgPtr, intptr_t _docScannerPtr, const char *tmpDir) {
//#ifdef DEBUG
//    int64_t start_time = cv::getTickCount();
//#endif
    cv::Mat rgbaMat = cv::Mat(cameraImgPtr->height, cameraImgPtr->width, CV_8UC4, cameraImgPtr->buf, cameraImgPtr->bytesPerRow);
    ROI *roiPtr = cameraImgPtr->roiPtr;
    cv::Rect roi(roiPtr->left, roiPtr->top, roiPtr->width, roiPtr->height);
    rgbaMat = rgbaMat(roi);
//    std::string rootDir(tmpDir);
//    std::string dstPath = rootDir + "/test.jpg";
//    std::cout << "ret:" << cv::imwrite(dstPath.c_str(), rgbaMat) << std::endl;
    
    auto *docScannerPtr = (DocScanner *)_docScannerPtr;
    std::vector<cv::Point> points;
    docScannerPtr->scan(rgbaMat, points);
    bool succ = points.size() == coordList->length;
    if (succ) {
        float width = rgbaMat.size().width;
        float height = rgbaMat.size().height;
        for (size_t i = 0; i < coordList->length; i++) {
            coordList->coordsPtr[i].x = points[i].x / width;
            coordList->coordsPtr[i].y = points[i].y / height;
        }
    }
//#ifdef DEBUG
//    float elapsedTime = (cv::getTickCount() - start_time) / cv::getTickFrequency();
//    float fps = 1 / elapsedTime;
//    std::cout << "findDocPoints fps:" << fps << std::endl;
//#endif
    return succ;
}

extern "C" __attribute__((visibility("default"))) __attribute__((used))
int findDocWithImgPath(const char *imgPath, const char *dstPath, intptr_t _docFinderPtr, CoordinateArray *coordList, ROI *roiPtr) {
    auto *docScannerPtr = (DocScanner *)_docFinderPtr;
    cv::Mat bgr = cv::imread(imgPath), rgb;
    cv::Rect roi(roiPtr->left, roiPtr->top, roiPtr->width, roiPtr->height);
    bgr = bgr(roi);
    cv::cvtColor(bgr, rgb, cv::COLOR_BGR2RGB);
    std::vector<cv::Point> points;
    docScannerPtr->scan(rgb, points);
    bool succ = points.size() == coordList->length;
    if (succ) {
        float width = rgb.size().width;
        float height = rgb.size().height;
        for (size_t i = 0; i < coordList->length; i++) {
            coordList->coordsPtr[i].x = points[i].x / width;
            coordList->coordsPtr[i].y = points[i].y / height;
        }
        cv::imwrite(dstPath, bgr);
    }
    return succ;
}

extern "C" __attribute__((visibility("default"))) __attribute__((used))
void deleteDocFinder(intptr_t _docFinderPtr) {
#ifdef DEBUG
    std::cout << "deleteDocFinder" << std::endl;
#endif
    auto *docFinderPtr = (DocScanner *)_docFinderPtr;
    delete docFinderPtr;
}