/*
 * Copyright (c) 2021 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 "Labels.hpp"                /* For label strings. */
#include "UseCaseHandler.hpp"        /* Handlers for different user options. */
#include "Wav2LetterModel.hpp"       /* Model class for running inference. */
#include "UseCaseCommonUtils.hpp"    /* Utils functions. */
#include "AsrClassifier.hpp"         /* Classifier. */
#include "InputFiles.hpp"            /* Generated audio clip header. */
#include "log_macros.h"

enum opcodes
{
    MENU_OPT_RUN_INF_NEXT = 1,       /* Run on next vector. */
    MENU_OPT_RUN_INF_CHOSEN,         /* Run on a user provided vector index. */
    MENU_OPT_RUN_INF_ALL,            /* Run inference on all. */
    MENU_OPT_SHOW_MODEL_INFO,        /* Show model info. */
    MENU_OPT_LIST_AUDIO_CLIPS        /* List the current baked audio clips. */
};

static void DisplayMenu()
{
    printf("\n\n");
    printf("User input required\n");
    printf("Enter option number from:\n\n");
    printf("  %u. Classify next audio clip\n", MENU_OPT_RUN_INF_NEXT);
    printf("  %u. Classify audio clip at chosen index\n", MENU_OPT_RUN_INF_CHOSEN);
    printf("  %u. Run classification on all audio clips\n", MENU_OPT_RUN_INF_ALL);
    printf("  %u. Show NN model info\n", MENU_OPT_SHOW_MODEL_INFO);
    printf("  %u. List audio clips\n\n", MENU_OPT_LIST_AUDIO_CLIPS);
    printf("  Choice: ");
    fflush(stdout);
}

/** @brief   Verify input and output tensor are of certain min dimensions. */
static bool VerifyTensorDimensions(const arm::app::Model& model);

void main_loop()
{
    arm::app::Wav2LetterModel model;  /* Model wrapper object. */

    /* Load the model. */
    if (!model.Init()) {
        printf_err("Failed to initialise model\n");
        return;
    } else if (!VerifyTensorDimensions(model)) {
        printf_err("Model's input or output dimension verification failed\n");
        return;
    }

    /* Instantiate application context. */
    arm::app::ApplicationContext caseContext;
    std::vector <std::string> labels;
    GetLabelsVector(labels);
    arm::app::AsrClassifier classifier;  /* Classifier wrapper object. */

    arm::app::Profiler profiler{"asr"};
    caseContext.Set<arm::app::Profiler&>("profiler", profiler);
    caseContext.Set<arm::app::Model&>("model", model);
    caseContext.Set<uint32_t>("clipIndex", 0);
    caseContext.Set<uint32_t>("frameLength", g_FrameLength);
    caseContext.Set<uint32_t>("frameStride", g_FrameStride);
    caseContext.Set<float>("scoreThreshold", g_ScoreThreshold);  /* Score threshold. */
    caseContext.Set<uint32_t>("ctxLen", g_ctxLen);  /* Left and right context length (MFCC feat vectors). */
    caseContext.Set<const std::vector <std::string>&>("labels", labels);
    caseContext.Set<arm::app::AsrClassifier&>("classifier", classifier);

    bool executionSuccessful = true;
    constexpr bool bUseMenu = NUMBER_OF_FILES > 1 ? true : false;

    /* Loop. */
    do {
        int menuOption = MENU_OPT_RUN_INF_NEXT;
        if (bUseMenu) {
            DisplayMenu();
            menuOption = arm::app::ReadUserInputAsInt();
            printf("\n");
        }
        switch (menuOption) {
            case MENU_OPT_RUN_INF_NEXT:
                executionSuccessful = ClassifyAudioHandler(
                                        caseContext,
                                        caseContext.Get<uint32_t>("clipIndex"),
                                        false);
                break;
            case MENU_OPT_RUN_INF_CHOSEN: {
                printf("    Enter the audio clip index [0, %d]: ",
                       NUMBER_OF_FILES-1);
                fflush(stdout);
                auto clipIndex = static_cast<uint32_t>(
                                    arm::app::ReadUserInputAsInt());
                executionSuccessful = ClassifyAudioHandler(caseContext,
                                                           clipIndex,
                                                           false);
                break;
            }
            case MENU_OPT_RUN_INF_ALL:
                executionSuccessful = ClassifyAudioHandler(
                                        caseContext,
                                        caseContext.Get<uint32_t>("clipIndex"),
                                        true);
                break;
            case MENU_OPT_SHOW_MODEL_INFO:
                executionSuccessful = model.ShowModelInfoHandler();
                break;
            case MENU_OPT_LIST_AUDIO_CLIPS:
                executionSuccessful = ListFilesHandler(caseContext);
                break;
            default:
                printf("Incorrect choice, try again.");
                break;
        }
    } while (executionSuccessful && bUseMenu);
    info("Main loop terminated.\n");
}

static bool VerifyTensorDimensions(const arm::app::Model& model)
{
    /* Populate tensor related parameters. */
    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;
    }

    TfLiteTensor* outputTensor = model.GetOutputTensor(0);
    if (!outputTensor->dims) {
        printf_err("Invalid output tensor dims\n");
        return false;
    } else if (outputTensor->dims->size < 3) {
        printf_err("Output tensor dimension should be >= 3\n");
        return false;
    }

    return true;
}