// For read and write
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <ios>
#include <iostream>

// SystemC global header
#include "sysc/communication/sc_signal.h"
#include "sysc/kernel/sc_module.h"
#include <systemc>

// Include common routines
#include <string>
#include <sys/stat.h> // mkdir
#include <utility>
#include <vector>
#include <verilated.h>
#include <verilated_vcd_sc.h>

// Include model header, generated from Verilating "isp.v"
#include "Visp.h"

// Write Pictures
#include "bitmap_image.hpp"

SC_MODULE(TB_ISP) {
  sc_core::sc_in_clk clk;
  sc_core::sc_in<bool> rst;

  sc_core::sc_in<bool> in_ready;         // next module ready to receive data
  sc_core::sc_out<bool> out_valid;       // next module data valid signal
  sc_core::sc_out<uint32_t> out_data[3]; // next module receive data

  sc_core::sc_in<bool> in_valid;    // this module receive data valid signal
  sc_core::sc_out<bool> out_ready;  // this module ready to receive data
  sc_core::sc_in<uint32_t> in_data; // this module receive data

  const uint16_t IN_WIDTH;
  const uint16_t IN_HEIGHT;
  const uint32_t IN_SIZE;
  const uint16_t OUT_WIDTH;
  const uint16_t OUT_HEIGHT;
  const uint32_t OUT_SIZE;
  const uint32_t FLAMES;
  const std::string OUT_DIR;

  bool is_done;                        // when receive all data
  std::vector<uint16_t> image;         // the data of image
  std::vector<uint32_t> process_image; // after isp process, the data of image

  SC_CTOR(TB_ISP, const uint16_t in_width, const uint16_t in_height,
          const uint16_t out_width, const uint16_t out_height,
          const uint32_t cnt_flame, const std::string& out_dir)
      : IN_WIDTH(in_width), IN_HEIGHT(in_height), IN_SIZE(in_width * in_height),
        OUT_WIDTH(out_width), OUT_HEIGHT(out_height),
        OUT_SIZE(out_width * out_height), FLAMES(cnt_flame),
        OUT_DIR(out_dir),
        process_image(std::vector<uint32_t>(out_width * out_height, 0)) {
    SC_CTHREAD(sendData, clk.pos()); // when clk posedge, exec sendData
    reset_signal_is(rst, true);      // set rst signal

    SC_CTHREAD(readData, clk.pos());
    reset_signal_is(rst, true); // set rst signal
  }

  void sendData(void) {
    // init var
    uint16_t pos_x = 0, pos_y = 0, cnt_flame = 0;
    bool is_finish = false; // when send all data
    // reset
    out_valid = false;
    for (auto &data : out_data)
      data = 0;

    while (true) {
      if (in_ready && !is_finish) {
        // valid and send data
        out_valid = true;
        out_data[0] = image[(pos_y + 0) * IN_WIDTH + pos_x];
        out_data[1] = image[(pos_y + 1) * IN_WIDTH + pos_x];
        out_data[2] = image[(pos_y + 2) * IN_WIDTH + pos_x];

        // print data
        std::printf("x=%4d, y=%4d, data=0x%04x\t", pos_x, pos_y,
                    image[(pos_y + 0) * IN_WIDTH + pos_x]);
        std::printf("x=%4d, y=%4d, data=0x%04x\t", pos_x, pos_y,
                    image[(pos_y + 1) * IN_WIDTH + pos_x]);
        std::printf("x=%4d, y=%4d, data=0x%04x\n", pos_x, pos_y,
                    image[(pos_y + 2) * IN_WIDTH + pos_x]);
        pos_x++;

        // calculate position and recognize when to finish
        if (pos_x >= IN_WIDTH) {
          pos_x = 0;
          pos_y++;
        }
        if (pos_y >= IN_HEIGHT - 1) {
          pos_y = 0;
          cnt_flame++;
        }
        if (cnt_flame >= FLAMES) {
          is_finish = true;
        }
      } else {
        out_valid = false;
      }

      // wait for next clk
      wait();
    }
  }

  void readData(void) {
    // init local var
    uint16_t pos_x = 0, pos_y = 0, cnt_flame = 0;
    uint32_t last_data = 0, cnt = 0;
    bool is_finish = false;
    // reset
    out_ready = false;
    is_done = false;

    while (true) {
      if (!is_finish) {
        out_ready = true;

        // when data valid, write it down
        if (in_valid) {
          process_image[pos_y * OUT_WIDTH + pos_x] = in_data;

          // calculate position
          pos_x++;

          if (pos_x >= OUT_WIDTH) {
            pos_x = 0;
            pos_y++;
          }
          if (pos_y >= OUT_HEIGHT) {
            pos_y = 0;
            saveData(
                ("output_img_" + std::to_string(cnt_flame) + ".bmp").c_str());
            cnt_flame++;
          }
          if (cnt_flame >= FLAMES) {
            is_finish = true;
          }
        }
      } else {
        out_ready = false;
      }

      // when no data send, give finish signal
      if (is_finish && (last_data == in_data)) {
        cnt++;
        if (cnt >= 100000L) { // when receive many times the same data
          is_done = true;
          std::printf("Finish Reading data; pos_x = %d, pos_y = %d\n", pos_x,
                      pos_y);
        }
      } else {
        cnt = 0;
      }
      last_data = in_data;

      // wait for next clk
      wait();
    }
  }

  bool saveData(const char *name) {
    bool ret = true;

    // Check Image Size
    if (process_image.size() > OUT_SIZE) {
      std::cout << "Process Image Over Size!!!\n"
                << "Image Size:" << process_image.size() << "\n";
      return false;
    }

    // Write BMP image
    bitmap_image bmp(OUT_WIDTH, OUT_HEIGHT);
    if (!bmp) {
      std::cout << "Output Image Open Failed!!!\n";
      return false;
    }
    for (int y = 0; y < OUT_HEIGHT; y++)
      for (int x = 0; x < OUT_WIDTH; x++)
        bmp.set_pixel(x, y,
                      (process_image[y * OUT_WIDTH + x] & 0x00ff0000) >> 16,
                      (process_image[y * OUT_WIDTH + x] & 0x0000ff00) >> 8,
                      (process_image[y * OUT_WIDTH + x] & 0x000000ff) >> 0);
    bmp.save_image(std::string(OUT_DIR) + name);
    return ret;
  }
};

// Image Parameters
static const uint16_t IN_WIDTH = 1936;
static const uint16_t IN_HEIGHT = 1088;
static const uint32_t IN_SIZE = (IN_WIDTH * IN_HEIGHT);
static const uint16_t OUT_WIDTH = 1920;
static const uint16_t OUT_HEIGHT = 1080;
static const uint32_t OUT_SIZE = (OUT_WIDTH * OUT_HEIGHT);
static const uint32_t FLAMES = 2;

// Input image path and Output directory path
#ifndef INPUT_IMG
const char *INPUT_IMG = "./src/transform/test.bin";
#endif
#ifndef OUTPUT_DIR
const char *OUTPUT_DIR = "./logs/";
#endif

// color gain for correcting color
struct color_gain {
  double red;
  double green;
  double blue;
} color_gain{1.1, 0.7, 1.3}, white_gain;

static const double gamma_value = 2.2;
static const double sat_inc = 0.5;
static const double contrast = 1.2;

using namespace sc_core;
using namespace sc_dt;

int sc_main(int argc, char *argv[]) {
  std::printf("Enter into sc_main\n");

  // Open Image
  std::ifstream image;
  image.open(INPUT_IMG, std::ios::in | std::ios::binary);
  // Check image whether is open
  if (!image.is_open()) {
    std::printf("Open Image Failed!!!\n");
    exit(0);
  } else {
    std::printf("Open Image Successfully!!!\n");
  }

  // Read and Transform Image
  std::vector<uint16_t> in_image(IN_SIZE);
  uint8_t *buf = new uint8_t[2 * IN_SIZE];
  image.read((char *)buf, 2 * IN_SIZE);
  uint32_t i = 0;
  for (int y = 0; y < IN_HEIGHT; y++) {
    for (int x = 0; x < IN_WIDTH; x++) {
      in_image[y * IN_WIDTH + x] =
          (uint16_t)buf[i] + ((uint16_t)buf[i + 1] << 8);
      i += 2;
    }
  }
  // Close and delete image
  image.close();
  delete[] buf;
  std::printf("Finish Reading Image\n");

  // This is a more complicated example, please also see the simpler
  // examples/make_hello_c.

  // Create logs/ directory in case we have traces to put under it
  Verilated::mkdir("logs");

  // Set debug level, 0 is off, 9 is highest presently used
  // May be overridden by commandArgs argument parsing
  Verilated::debug(0);

  // Randomization reset policy
  // May be overridden by commandArgs argument parsing
  Verilated::randReset(2);

  // Before any evaluation, need to know to calculate those signals only used
  // for tracing
  Verilated::traceEverOn(true);

  // Pass arguments so Verilated code can see them, e.g. $value$plusargs
  // This needs to be called before you create any model
  Verilated::commandArgs(argc, argv);

  // General logfile
  std::ios::sync_with_stdio();

  // Define clocks
  sc_clock clk{"clk", 10, SC_NS, 0.5, 3, SC_NS, true};
  // Define interconnect
  sc_signal<bool> rst;
  // ISP Modules in ports
  sc_signal<bool> in_valid;
  sc_signal<bool> in_ready;
  sc_signal<uint32_t> in_data[3];
  // ISP Modules out ports
  sc_signal<bool> out_valid;
  sc_signal<bool> out_ready;
  sc_signal<uint32_t> out_data;
  // ISP Modules Enable Ports
  sc_signal<bool> blender_enable;
  sc_signal<bool> gamma_enable;
  sc_signal<bool> white_enable;
  sc_signal<bool> saturation_enable;
  // ISP Modules Configurations Ports
  sc_signal<uint32_t> gain_red;
  sc_signal<uint32_t> gain_green;
  sc_signal<uint32_t> gain_blue;
  sc_signal<uint32_t> flame_rate;
  sc_signal<uint32_t> saturation_inc;
  sc_signal<uint32_t> gamma_table[256];
  sc_signal<uint32_t> white_gain[3];

  // Construct the Verilated model, from inside Visp.h
  Visp isp("Visp");
  isp.clk(clk);
  isp.reset(rst);
  isp.in_en(in_valid);
  isp.in_ready(in_ready);
  for (int i = 0; i < 3; i++)
    isp.in_data[i](in_data[i]);
  sc_signal<bool> out_receive;
  isp.out_receive(out_receive);
  isp.out_en(out_valid);
  isp.out_ready(out_ready);
  isp.out_data(out_data);
  isp.blender_enable(blender_enable);
  isp.gamma_enable(gamma_enable);
  isp.white_enable(white_enable);
  isp.saturation_enable(saturation_enable);
  isp.gain_red(gain_red);
  isp.gain_green(gain_green);
  isp.gain_blue(gain_blue);
  isp.flame_rate(flame_rate);
  isp.saturation_inc(saturation_inc);
  for (int i = 0; i < 256; i++)
    isp.gamma_table[i](gamma_table[i]);
  for (int i = 0; i < 3; i++)
    isp.white_gain[i](white_gain[i]);

  // Construct testbench module
  TB_ISP tb_isp("tb_isp", IN_WIDTH, IN_HEIGHT, OUT_WIDTH, OUT_HEIGHT, FLAMES, OUTPUT_DIR);
  tb_isp.image = std::move(in_image);
  tb_isp.clk(clk);
  tb_isp.rst(rst);
  // Connect input signal
  tb_isp.in_valid(out_valid);
  tb_isp.in_ready(out_ready);
  tb_isp.in_data(out_data);
  // Connect output signal
  tb_isp.out_valid(in_valid);
  tb_isp.out_ready(in_ready);
  for (int i = 0; i < 3; i++)
    tb_isp.out_data[i](in_data[i]);

  // Set ISP modules parameters
  // Color Blender
  blender_enable = true;
  gain_red = static_cast<uint32_t>(color_gain.red * std::pow(2, 8));
  gain_green = static_cast<uint32_t>(color_gain.green * std::pow(2, 8));
  gain_blue = static_cast<uint32_t>(color_gain.blue * std::pow(2, 8));
  // Gamma table
  gamma_enable = true;
  for (int i = 0; i < 256; i++) {
    gamma_table[i] =
        static_cast<uint32_t>(255 * pow(i / 255.0, 1.0 / gamma_value));
  }
  // White Correction
  white_enable = true;
  flame_rate = 0;
  white_gain[0] = 255;
  white_gain[1] = 255;
  white_gain[2] = 255;
  // Saturation Correction
  saturation_enable = true;
  saturation_inc = (int32_t)((sat_inc >= 0) ? (sat_inc * std::pow(2, 8))
                                            : (sat_inc * std::pow(2, 8)));

  // You must do one evaluation before enabling waves, in order to allow
  // SystemC to interconnect everything for testing.
  sc_start(SC_ZERO_TIME);

  // If verilator was invoked with --trace argument,
  // and if at run time passed the +trace argument, turn on tracing
  VerilatedVcdSc *tfp = nullptr;
  const char *flag = Verilated::commandArgsPlusMatch("trace");
  if (flag && 0 == std::strcmp(flag, "+trace")) {
    std::cout << "Enabling waves into logs/vlt_dump.vcd...\n";
    tfp = new VerilatedVcdSc;
    isp.trace(tfp, 99); // Trace 99 levels of hierarchy
    Verilated::mkdir("logs");
    tfp->open("logs/vlt_dump.vcd");
  }

  // Simulate until $finish
  std::cout << "Ready to simulate!\n";
  while (!Verilated::gotFinish()) {
    // Flush the wave files each cycle so we can immediately see the output
    // Don't do this in "real" programs, do it in an abort() handler instead
    if (tfp)
      tfp->flush();

    // Apply inputs
    if (sc_time_stamp() < sc_time(10, SC_NS)) {
      rst.write(1); // Assert reset
    } else {
      rst.write(0); // Deassert reset
    }

    if (tb_isp.is_done)
      break;

    // Simulate 1ns
    sc_start(1, SC_NS);
  }

  // Final model cleanup
  isp.final();

  // Close trace if opened
  if (tfp) {
    tfp->close();
    tfp = nullptr;
  }

  // Return good completion status
  return 0;
}