/**
 * Marlin 3D Printer Firmware
 * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

#include "../../../inc/MarlinConfig.h"

#if ENABLED(AUTO_BED_LEVELING_UBL)

  #include "../bedlevel.h"

  unified_bed_leveling ubl;

  #include "../../../MarlinCore.h"
  #include "../../../gcode/gcode.h"

  #include "../../../module/settings.h"
  #include "../../../module/planner.h"
  #include "../../../module/motion.h"
  #include "../../../module/probe.h"

  #if ENABLED(EXTENSIBLE_UI)
    #include "../../../lcd/extui/ui_api.h"
  #endif

  #include "math.h"

  void unified_bed_leveling::echo_name() { SERIAL_ECHOPGM("Unified Bed Leveling"); }

  void unified_bed_leveling::report_current_mesh() {
    if (!leveling_is_valid()) return;
    SERIAL_ECHO_MSG("  G29 I999");
    GRID_LOOP(x, y)
      if (!isnan(z_values[x][y])) {
        SERIAL_ECHO_START();
        SERIAL_ECHOPAIR("  M421 I", int(x), " J", int(y));
        SERIAL_ECHOLNPAIR_F_P(SP_Z_STR, z_values[x][y], 4);
        serial_delay(75); // Prevent Printrun from exploding
      }
  }

  void unified_bed_leveling::report_state() {
    echo_name();
    SERIAL_ECHO_TERNARY(planner.leveling_active, " System v" UBL_VERSION " ", "", "in", "active\n");
    serial_delay(50);
  }

  int8_t unified_bed_leveling::storage_slot;

  float unified_bed_leveling::z_values[GRID_MAX_POINTS_X][GRID_MAX_POINTS_Y];

  #define _GRIDPOS(A,N) (MESH_MIN_##A + N * (MESH_##A##_DIST))

  const float
  unified_bed_leveling::_mesh_index_to_xpos[GRID_MAX_POINTS_X] PROGMEM = ARRAY_N(GRID_MAX_POINTS_X,
    _GRIDPOS(X,  0), _GRIDPOS(X,  1), _GRIDPOS(X,  2), _GRIDPOS(X,  3),
    _GRIDPOS(X,  4), _GRIDPOS(X,  5), _GRIDPOS(X,  6), _GRIDPOS(X,  7),
    _GRIDPOS(X,  8), _GRIDPOS(X,  9), _GRIDPOS(X, 10), _GRIDPOS(X, 11),
    _GRIDPOS(X, 12), _GRIDPOS(X, 13), _GRIDPOS(X, 14), _GRIDPOS(X, 15)
  ),
  unified_bed_leveling::_mesh_index_to_ypos[GRID_MAX_POINTS_Y] PROGMEM = ARRAY_N(GRID_MAX_POINTS_Y,
    _GRIDPOS(Y,  0), _GRIDPOS(Y,  1), _GRIDPOS(Y,  2), _GRIDPOS(Y,  3),
    _GRIDPOS(Y,  4), _GRIDPOS(Y,  5), _GRIDPOS(Y,  6), _GRIDPOS(Y,  7),
    _GRIDPOS(Y,  8), _GRIDPOS(Y,  9), _GRIDPOS(Y, 10), _GRIDPOS(Y, 11),
    _GRIDPOS(Y, 12), _GRIDPOS(Y, 13), _GRIDPOS(Y, 14), _GRIDPOS(Y, 15)
  );

  volatile int16_t unified_bed_leveling::encoder_diff;

  unified_bed_leveling::unified_bed_leveling() { reset(); }

  void unified_bed_leveling::reset() {
    const bool was_enabled = planner.leveling_active;
    set_bed_leveling_enabled(false);
    storage_slot = -1;
    ZERO(z_values);
    #if ENABLED(EXTENSIBLE_UI)
      GRID_LOOP(x, y) ExtUI::onMeshUpdate(x, y, 0);
    #endif
    if (was_enabled) report_current_position();
  }

  void unified_bed_leveling::invalidate() {
    set_bed_leveling_enabled(false);
    set_all_mesh_points_to_value(NAN);
  }

  void unified_bed_leveling::set_all_mesh_points_to_value(const float value) {
    GRID_LOOP(x, y) {
      z_values[x][y] = value;
      TERN_(EXTENSIBLE_UI, ExtUI::onMeshUpdate(x, y, value));
    }
  }

  #if ENABLED(OPTIMIZED_MESH_STORAGE)

    constexpr float mesh_store_scaling = 1000;
    constexpr int16_t Z_STEPS_NAN = INT16_MAX;

    void unified_bed_leveling::set_store_from_mesh(const bed_mesh_t &in_values, mesh_store_t &stored_values) {
      auto z_to_store = [](const float &z) {
        if (isnan(z)) return Z_STEPS_NAN;
        const int32_t z_scaled = TRUNC(z * mesh_store_scaling);
        if (z_scaled == Z_STEPS_NAN || !WITHIN(z_scaled, INT16_MIN, INT16_MAX))
          return Z_STEPS_NAN; // If Z is out of range, return our custom 'NaN'
        return int16_t(z_scaled);
      };
      GRID_LOOP(x, y) stored_values[x][y] = z_to_store(in_values[x][y]);
    }

    void unified_bed_leveling::set_mesh_from_store(const mesh_store_t &stored_values, bed_mesh_t &out_values) {
      auto store_to_z = [](const int16_t z_scaled) {
        return z_scaled == Z_STEPS_NAN ? NAN : z_scaled / mesh_store_scaling;
      };
      GRID_LOOP(x, y) out_values[x][y] = store_to_z(stored_values[x][y]);
    }

  #endif // OPTIMIZED_MESH_STORAGE

  static void serial_echo_xy(const uint8_t sp, const int16_t x, const int16_t y) {
    SERIAL_ECHO_SP(sp);
    SERIAL_CHAR('(');
    if (x < 100) { SERIAL_CHAR(' '); if (x < 10) SERIAL_CHAR(' '); }
    SERIAL_ECHO(x);
    SERIAL_CHAR(',');
    if (y < 100) { SERIAL_CHAR(' '); if (y < 10) SERIAL_CHAR(' '); }
    SERIAL_ECHO(y);
    SERIAL_CHAR(')');
    serial_delay(5);
  }

  static void serial_echo_column_labels(const uint8_t sp) {
    SERIAL_ECHO_SP(7);
    LOOP_L_N(i, GRID_MAX_POINTS_X) {
      if (i < 10) SERIAL_CHAR(' ');
      SERIAL_ECHO((int)i);
      SERIAL_ECHO_SP(sp);
    }
    serial_delay(10);
  }

  /**
   * Produce one of these mesh maps:
   *   0: Human-readable
   *   1: CSV format for spreadsheet import
   *   2: TODO: Display on Graphical LCD
   *   4: Compact Human-Readable
   */
  void unified_bed_leveling::display_map(const int map_type) {
    const bool was = gcode.set_autoreport_paused(true);

    constexpr uint8_t eachsp = 1 + 6 + 1,                           // [-3.567]
                      twixt = eachsp * (GRID_MAX_POINTS_X) - 9 * 2; // Leading 4sp, Coordinates 9sp each

    const bool human = !(map_type & 0x3), csv = map_type == 1, lcd = map_type == 2, comp = map_type & 0x4;

    SERIAL_ECHOPGM("\nBed Topography Report");
    if (human) {
      SERIAL_ECHOLNPGM(":\n");
      serial_echo_xy(4, MESH_MIN_X, MESH_MAX_Y);
      serial_echo_xy(twixt, MESH_MAX_X, MESH_MAX_Y);
      SERIAL_EOL();
      serial_echo_column_labels(eachsp - 2);
    }
    else {
      SERIAL_ECHOPGM(" for ");
      serialprintPGM(csv ? PSTR("CSV:\n") : PSTR("LCD:\n"));
    }

    // Add XY probe offset from extruder because probe.probe_at_point() subtracts them when
    // moving to the XY position to be measured. This ensures better agreement between
    // the current Z position after G28 and the mesh values.
    const xy_int8_t curr = closest_indexes(xy_pos_t(current_position) + probe.offset_xy);

    if (!lcd) SERIAL_EOL();
    for (int8_t j = GRID_MAX_POINTS_Y - 1; j >= 0; j--) {

      // Row Label (J index)
      if (human) {
        if (j < 10) SERIAL_CHAR(' ');
        SERIAL_ECHO(j);
        SERIAL_ECHOPGM(" |");
      }

      // Row Values (I indexes)
      LOOP_L_N(i, GRID_MAX_POINTS_X) {

        // Opening Brace or Space
        const bool is_current = i == curr.x && j == curr.y;
        if (human) SERIAL_CHAR(is_current ? '[' : ' ');

        // Z Value at current I, J
        const float f = z_values[i][j];
        if (lcd) {
          // TODO: Display on Graphical LCD
        }
        else if (isnan(f))
          serialprintPGM(human ? PSTR("  .   ") : PSTR("NAN"));
        else if (human || csv) {
          if (human && f >= 0.0) SERIAL_CHAR(f > 0 ? '+' : ' ');  // Space for positive ('-' for negative)
          SERIAL_ECHO_F(f, 3);                                    // Positive: 5 digits, Negative: 6 digits
        }
        if (csv && i < GRID_MAX_POINTS_X - 1) SERIAL_CHAR('\t');

        // Closing Brace or Space
        if (human) SERIAL_CHAR(is_current ? ']' : ' ');

        SERIAL_FLUSHTX();
        idle_no_sleep();
      }
      if (!lcd) SERIAL_EOL();

      // A blank line between rows (unless compact)
      if (j && human && !comp) SERIAL_ECHOLNPGM("   |");
    }

    if (human) {
      serial_echo_column_labels(eachsp - 2);
      SERIAL_EOL();
      serial_echo_xy(4, MESH_MIN_X, MESH_MIN_Y);
      serial_echo_xy(twixt, MESH_MAX_X, MESH_MIN_Y);
      SERIAL_EOL();
      SERIAL_EOL();
    }

    gcode.set_autoreport_paused(was);
  }

  bool unified_bed_leveling::sanity_check() {
    uint8_t error_flag = 0;

    if (settings.calc_num_meshes() < 1) {
      SERIAL_ECHOLNPGM("?Mesh too big for EEPROM.");
      error_flag++;
    }

    return !!error_flag;
  }

#endif // AUTO_BED_LEVELING_UBL