#include <stdio.h>
#include <stdlib.h>
#include "opencv2/opencv.hpp"

#include "ppocr_rec.h"
#include "common.h"
#include "file_utils.h"
#include "image_utils.h"

static void dump_tensor_attr(rknn_tensor_attr* attr)
{
    printf("  index=%d, name=%s, n_dims=%d, dims=[%d, %d, %d, %d], n_elems=%d, size=%d, fmt=%s, type=%s, qnt_type=%s, "
            "zp=%d, scale=%f\n",
            attr->index, attr->name, attr->n_dims, attr->dims[0], attr->dims[1], attr->dims[2], attr->dims[3],
            attr->n_elems, attr->size, get_format_string(attr->fmt), get_type_string(attr->type),
            get_qnt_type_string(attr->qnt_type), attr->zp, attr->scale);
}

int init_ppocr_rec_model(const char* model_path, rknn_app_context_t* app_ctx)
{
    int ret;
    int model_len = 0;
    char* model;
    rknn_context ctx = 0;

    // Load RKNN Model
    model_len = read_data_from_file(model_path, &model);
    if (model == NULL) {
        printf("load_model fail!\n");
        return -1;
    }

    ret = rknn_init(&ctx, model, model_len, 0, NULL);
    free(model);
    if (ret < 0) {
        printf("rknn_init fail! ret=%d\n", ret);
        return -1;
    }

    // Get Model Input Output Number
    rknn_input_output_num io_num;
    ret = rknn_query(ctx, RKNN_QUERY_IN_OUT_NUM, &io_num, sizeof(io_num));
    if (ret != RKNN_SUCC) {
        printf("rknn_query fail! ret=%d\n", ret);
        return -1;
    }
    printf("model input num: %d, output num: %d\n", io_num.n_input, io_num.n_output);

    // Get Model Input Info
    printf("input tensors:\n");
    rknn_tensor_attr input_attrs[io_num.n_input];
    memset(input_attrs, 0, sizeof(input_attrs));
    for (int i = 0; i < io_num.n_input; i++) {
        input_attrs[i].index = i;
        ret = rknn_query(ctx, RKNN_QUERY_INPUT_ATTR, &(input_attrs[i]), sizeof(rknn_tensor_attr));
        if (ret != RKNN_SUCC) {
            printf("rknn_query fail! ret=%d\n", ret);
            return -1;
        }
        dump_tensor_attr(&(input_attrs[i]));
    }

    // Get Model Output Info
    printf("output tensors:\n");
    rknn_tensor_attr output_attrs[io_num.n_output];
    memset(output_attrs, 0, sizeof(output_attrs));
    for (int i = 0; i < io_num.n_output; i++) {
        output_attrs[i].index = i;
        ret = rknn_query(ctx, RKNN_QUERY_OUTPUT_ATTR, &(output_attrs[i]), sizeof(rknn_tensor_attr));
        if (ret != RKNN_SUCC) {
            printf("rknn_query fail! ret=%d\n", ret);
            return -1;
        }
        dump_tensor_attr(&(output_attrs[i]));
    }

    // Set to context
    app_ctx->rknn_ctx = ctx;
    app_ctx->io_num = io_num;
    app_ctx->input_attrs = (rknn_tensor_attr*)malloc(io_num.n_input * sizeof(rknn_tensor_attr));
    memcpy(app_ctx->input_attrs, input_attrs, io_num.n_input * sizeof(rknn_tensor_attr));
    app_ctx->output_attrs = (rknn_tensor_attr*)malloc(io_num.n_output * sizeof(rknn_tensor_attr));
    memcpy(app_ctx->output_attrs, output_attrs, io_num.n_output * sizeof(rknn_tensor_attr));

    if (input_attrs[0].fmt == RKNN_TENSOR_NCHW) {
        printf("model is NCHW input fmt\n");
        app_ctx->model_channel = input_attrs[0].dims[1];
        app_ctx->model_height  = input_attrs[0].dims[2];
        app_ctx->model_width   = input_attrs[0].dims[3];
    } else {
        printf("model is NHWC input fmt\n");
        app_ctx->model_height  = input_attrs[0].dims[1];
        app_ctx->model_width   = input_attrs[0].dims[2];
        app_ctx->model_channel = input_attrs[0].dims[3];
    }
    printf("model input height=%d, width=%d, channel=%d\n",
        app_ctx->model_height, app_ctx->model_width, app_ctx->model_channel);

    return 0;
}

int release_ppocr_rec_model(rknn_app_context_t* app_ctx)
{
    if (app_ctx->input_attrs != NULL) {
        free(app_ctx->input_attrs);
        app_ctx->input_attrs = NULL;
    }
    if (app_ctx->output_attrs != NULL) {
        free(app_ctx->output_attrs);
        app_ctx->output_attrs = NULL;
    }
    if (app_ctx->rknn_ctx != 0) {
        rknn_destroy(app_ctx->rknn_ctx);
        app_ctx->rknn_ctx = 0;
    }
    return 0;
}

int inference_ppocr_rec_model(rknn_app_context_t* app_ctx, image_buffer_t* src_img, ppocr_rec_result* out_result)
{
    int ret;
    rknn_input inputs[1];
    rknn_output outputs[1];
    int allow_slight_change = 1;

    memset(inputs, 0, sizeof(inputs));
    memset(outputs, 0, sizeof(outputs));

    // Pre Process
    float ratio = src_img->width / float(src_img->height);
    int resized_w;
    int imgW = app_ctx->model_width, imgH = app_ctx->model_height;
    if (std::ceil(imgH*ratio) > imgW) {
        resized_w = imgW;
    }
    else {
        resized_w = std::ceil(imgH*ratio);
    }

    cv::Mat img_M = cv::Mat(src_img->height, src_img->width, CV_8UC3,(uint8_t*)src_img->virt_addr);
    cv::resize(img_M, img_M, cv::Size(resized_w, imgH));
    img_M.convertTo(img_M, CV_32FC3);
    img_M = (img_M - 127.5)/127.5;
    if (resized_w < imgW) {
        copyMakeBorder(img_M, img_M, 0, 0, 0, imgW- resized_w, cv::BORDER_CONSTANT, 0);
    }

    // Set Input Data
    inputs[0].index = 0;
    inputs[0].type  = RKNN_TENSOR_FLOAT32;
    inputs[0].fmt   = RKNN_TENSOR_NHWC;
    inputs[0].size  = app_ctx->model_width * app_ctx->model_height * app_ctx->model_channel * sizeof(float);
    // inputs[0].buf   = img.virt_addr;
    inputs[0].buf = malloc(inputs[0].size);
    memcpy(inputs[0].buf, img_M.data, inputs[0].size);

    ret = rknn_inputs_set(app_ctx->rknn_ctx, 1, inputs);
    if (ret < 0) {
        printf("rknn_input_set fail! ret=%d\n", ret);
        return -1;
    }

    // Run
    printf("rknn_run\n");
    ret = rknn_run(app_ctx->rknn_ctx, nullptr);
    if (ret < 0) {
        printf("rknn_run fail! ret=%d\n", ret);
        return -1;
    }

    // Get Output
    int out_len_seq = app_ctx->model_width / 8;
    outputs[0].want_float = 1;
    ret = rknn_outputs_get(app_ctx->rknn_ctx, 1, outputs, NULL);
    if (ret < 0) {
        printf("rknn_outputs_get fail! ret=%d\n", ret);
        goto out;
    }

    // Post Process
    ret = rec_postprocess((float*)outputs[0].buf, MODEL_OUT_CHANNEL, out_len_seq, out_result);
    
    // Remeber to release rknn output
    rknn_outputs_release(app_ctx->rknn_ctx, 1, outputs);

out:
    if (inputs[0].buf != NULL) {
        free(inputs[0].buf);
    }

    return ret;
}