/*
 * Copyright (c) 2022 Arm Limited. All rights reserved.
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "UseCaseHandler.hpp"
#include "InputFiles.hpp"
#include "YoloFastestModel.hpp"
#include "UseCaseCommonUtils.hpp"
#include "DetectorPostProcessing.hpp"
#include "hal.h"
#include "log_macros.h"

#include <cinttypes>

namespace arm {
namespace app {

    /**
     * @brief           Presents inference results along using the data presentation
     *                  object.
     * @param[in]       results            Vector of detection results to be displayed.
     * @return          true if successful, false otherwise.
     **/
    static bool PresentInferenceResult(const std::vector<arm::app::object_detection::DetectionResult>& results);

    /**
     * @brief           Draw boxes directly on the LCD for all detected objects.
     * @param[in]       results            Vector of detection results to be displayed.
     * @param[in]       imageStartX        X coordinate where the image starts on the LCD.
     * @param[in]       imageStartY        Y coordinate where the image starts on the LCD.
     * @param[in]       imgDownscaleFactor How much image has been downscaled on LCD.
     **/
    static void DrawDetectionBoxes(
            const std::vector<arm::app::object_detection::DetectionResult>& results,
           uint32_t imgStartX,
           uint32_t imgStartY,
           uint32_t imgDownscaleFactor);

    /* Object detection classification handler. */
    bool ObjectDetectionHandler(ApplicationContext& ctx, uint32_t imgIndex, bool runAll)
    {
        auto& profiler = ctx.Get<Profiler&>("profiler");

        constexpr uint32_t dataPsnImgDownscaleFactor = 1;
        constexpr uint32_t dataPsnImgStartX = 10;
        constexpr uint32_t dataPsnImgStartY = 35;

        constexpr uint32_t dataPsnTxtInfStartX = 150;
        constexpr uint32_t dataPsnTxtInfStartY = 40;

        hal_lcd_clear(COLOR_BLACK);

        auto& model = ctx.Get<Model&>("model");

        /* If the request has a valid size, set the image index. */
        if (imgIndex < NUMBER_OF_FILES) {
            if (!SetAppCtxIfmIdx(ctx, imgIndex, "imgIndex")) {
                return false;
            }
        }
        if (!model.IsInited()) {
            printf_err("Model is not initialised! Terminating processing.\n");
            return false;
        }

        auto curImIdx = ctx.Get<uint32_t>("imgIndex");

        TfLiteTensor* inputTensor = model.GetInputTensor(0);

        if (!inputTensor->dims) {
            printf_err("Invalid input tensor dims\n");
            return false;
        } else if (inputTensor->dims->size < 3) {
            printf_err("Input tensor dimension should be >= 3\n");
            return false;
        }

        TfLiteIntArray* inputShape = model.GetInputShape(0);

        const uint32_t nCols = inputShape->data[arm::app::YoloFastestModel::ms_inputColsIdx];
        const uint32_t nRows = inputShape->data[arm::app::YoloFastestModel::ms_inputRowsIdx];

        /* Get pre/post-processing objects. */
        auto& postp = ctx.Get<object_detection::DetectorPostprocessing&>("postprocess");

        do {
            /* Strings for presentation/logging. */
            std::string str_inf{"Running inference... "};

            const uint8_t* curr_image = get_img_array(ctx.Get<uint32_t>("imgIndex"));

            /* Copy over the data and convert to grayscale */
            auto* dstPtr = static_cast<uint8_t*>(inputTensor->data.uint8);
            const size_t copySz = inputTensor->bytes < IMAGE_DATA_SIZE ?
                                inputTensor->bytes : IMAGE_DATA_SIZE;

            /* Convert to gray scale and populate input tensor. */
            image::RgbToGrayscale(curr_image, dstPtr, copySz);

            /* Display image on the LCD. */
            hal_lcd_display_image(
                (channelsImageDisplayed == 3) ? curr_image : dstPtr,
                nCols, nRows, channelsImageDisplayed,
                dataPsnImgStartX, dataPsnImgStartY, dataPsnImgDownscaleFactor);

            /* If the data is signed. */
            if (model.IsDataSigned()) {
                image::ConvertImgToInt8(inputTensor->data.data, inputTensor->bytes);
            }

            /* Display message on the LCD - inference running. */
            hal_lcd_display_text(str_inf.c_str(), str_inf.size(),
                                    dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

            /* Run inference over this image. */
            info("Running inference on image %" PRIu32 " => %s\n", ctx.Get<uint32_t>("imgIndex"),
                get_filename(ctx.Get<uint32_t>("imgIndex")));

            if (!RunInference(model, profiler)) {
                return false;
            }

            /* Erase. */
            str_inf = std::string(str_inf.size(), ' ');
            hal_lcd_display_text(str_inf.c_str(), str_inf.size(),
                                    dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

            /* Detector post-processing*/
            std::vector<object_detection::DetectionResult> results;
            TfLiteTensor* modelOutput0 = model.GetOutputTensor(0);
            TfLiteTensor* modelOutput1 = model.GetOutputTensor(1);
            postp.RunPostProcessing(
                nRows,
                nCols,
                modelOutput0,
                modelOutput1,
                results);

            /* Draw boxes. */
            DrawDetectionBoxes(results, dataPsnImgStartX, dataPsnImgStartY, dataPsnImgDownscaleFactor);

#if VERIFY_TEST_OUTPUT
            arm::app::DumpTensor(modelOutput0);
            arm::app::DumpTensor(modelOutput1);
#endif /* VERIFY_TEST_OUTPUT */

            if (!PresentInferenceResult(results)) {
                return false;
            }

            profiler.PrintProfilingResult();

            IncrementAppCtxIfmIdx(ctx,"imgIndex");

        } while (runAll && ctx.Get<uint32_t>("imgIndex") != curImIdx);

        return true;
    }

    static bool PresentInferenceResult(const std::vector<arm::app::object_detection::DetectionResult>& results)
    {
        hal_lcd_set_text_color(COLOR_GREEN);

        /* If profiling is enabled, and the time is valid. */
        info("Final results:\n");
        info("Total number of inferences: 1\n");

        for (uint32_t i = 0; i < results.size(); ++i) {
            info("%" PRIu32 ") (%f) -> %s {x=%d,y=%d,w=%d,h=%d}\n", i,
                results[i].m_normalisedVal, "Detection box:",
                results[i].m_x0, results[i].m_y0, results[i].m_w, results[i].m_h );
        }

        return true;
    }

    static void DrawDetectionBoxes(const std::vector<arm::app::object_detection::DetectionResult>& results,
                                   uint32_t imgStartX,
                                   uint32_t imgStartY,
                                   uint32_t imgDownscaleFactor)
    {
        uint32_t lineThickness = 1;

        for (const auto& result: results) {
            /* Top line. */
            hal_lcd_display_box(imgStartX + result.m_x0/imgDownscaleFactor,
                    imgStartY + result.m_y0/imgDownscaleFactor,
                    result.m_w/imgDownscaleFactor, lineThickness, COLOR_GREEN);
            /* Bot line. */
            hal_lcd_display_box(imgStartX + result.m_x0/imgDownscaleFactor,
                    imgStartY + (result.m_y0 + result.m_h)/imgDownscaleFactor - lineThickness,
                    result.m_w/imgDownscaleFactor, lineThickness, COLOR_GREEN);

            /* Left line. */
            hal_lcd_display_box(imgStartX + result.m_x0/imgDownscaleFactor,
                    imgStartY + result.m_y0/imgDownscaleFactor,
                    lineThickness, result.m_h/imgDownscaleFactor, COLOR_GREEN);
            /* Right line. */
            hal_lcd_display_box(imgStartX + (result.m_x0 + result.m_w)/imgDownscaleFactor - lineThickness,
                    imgStartY + result.m_y0/imgDownscaleFactor,
                    lineThickness, result.m_h/imgDownscaleFactor, COLOR_GREEN);
        }
    }

} /* namespace app */
} /* namespace arm */