/**
 * 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 <http://www.gnu.org/licenses/>.
 *
 */
#pragma once

//#define UBL_DEVEL_DEBUGGING

#include "../../../module/motion.h"

#define DEBUG_OUT ENABLED(DEBUG_LEVELING_FEATURE)
#include "../../../core/debug_out.h"

#define UBL_VERSION "1.01"
#define UBL_OK false
#define UBL_ERR true

enum MeshPointType : char { INVALID, REAL, SET_IN_BITMAP };

// External references

struct mesh_index_pair;

#define MESH_X_DIST (float(MESH_MAX_X - (MESH_MIN_X)) / float(GRID_MAX_POINTS_X - 1))
#define MESH_Y_DIST (float(MESH_MAX_Y - (MESH_MIN_Y)) / float(GRID_MAX_POINTS_Y - 1))

class unified_bed_leveling {
  private:

    static int    g29_verbose_level,
                  g29_phase_value,
                  g29_repetition_cnt,
                  g29_storage_slot,
                  g29_map_type;
    static bool   g29_c_flag;
    static float  g29_card_thickness,
                  g29_constant;
    static xy_pos_t g29_pos;
    static xy_bool_t xy_seen;

    #if HAS_BED_PROBE
      static int  g29_grid_size;
    #endif

    #if ENABLED(NEWPANEL)
      static void move_z_with_encoder(const float &multiplier);
      static float measure_point_with_encoder();
      static float measure_business_card_thickness(float in_height);
      static void manually_probe_remaining_mesh(const xy_pos_t&, const float&, const float&, const bool) _O0;
      static void fine_tune_mesh(const xy_pos_t &pos, const bool do_ubl_mesh_map) _O0;
    #endif

    static bool g29_parameter_parsing() _O0;
    static void shift_mesh_height();
    static void probe_entire_mesh(const xy_pos_t &near, const bool do_ubl_mesh_map, const bool stow_probe, const bool do_furthest) _O0;
    static void tilt_mesh_based_on_3pts(const float &z1, const float &z2, const float &z3);
    static void tilt_mesh_based_on_probed_grid(const bool do_ubl_mesh_map);
    static bool smart_fill_one(const uint8_t x, const uint8_t y, const int8_t xdir, const int8_t ydir);
    static inline bool smart_fill_one(const xy_uint8_t &pos, const xy_uint8_t &dir) {
      return smart_fill_one(pos.x, pos.y, dir.x, dir.y);
    }
    static void smart_fill_mesh();

    #if ENABLED(UBL_DEVEL_DEBUGGING)
      static void g29_what_command();
      static void g29_eeprom_dump();
      static void g29_compare_current_mesh_to_stored_mesh();
    #endif

  public:

    static void echo_name();
    static void report_current_mesh();
    static void report_state();
    static void save_ubl_active_state_and_disable();
    static void restore_ubl_active_state_and_leave();
    static void display_map(const int) _O0;
    static mesh_index_pair find_closest_mesh_point_of_type(const MeshPointType, const xy_pos_t&, const bool=false, MeshFlags *done_flags=nullptr) _O0;
    static mesh_index_pair find_furthest_invalid_mesh_point() _O0;
    static void reset();
    static void invalidate();
    static void set_all_mesh_points_to_value(const float value);
    static void adjust_mesh_to_mean(const bool cflag, const float value);
    static bool sanity_check();

    static void G29() _O0;                          // O0 for no optimization
    static void smart_fill_wlsf(const float &) _O2; // O2 gives smaller code than Os on A2560

    static int8_t storage_slot;

    static bed_mesh_t z_values;
    static const float _mesh_index_to_xpos[GRID_MAX_POINTS_X],
                       _mesh_index_to_ypos[GRID_MAX_POINTS_Y];

    #if HAS_LCD_MENU
      static bool lcd_map_control;
    #endif

    static volatile int encoder_diff; // Volatile because it's changed at interrupt time.

    unified_bed_leveling();

    FORCE_INLINE static void set_z(const int8_t px, const int8_t py, const float &z) { z_values[px][py] = z; }

    static int8_t cell_index_x(const float &x) {
      const int8_t cx = (x - (MESH_MIN_X)) * RECIPROCAL(MESH_X_DIST);
      return constrain(cx, 0, (GRID_MAX_POINTS_X) - 1);   // -1 is appropriate if we want all movement to the X_MAX
    }                                                     // position. But with this defined this way, it is possible
                                                          // to extrapolate off of this point even further out. Probably
                                                          // that is OK because something else should be keeping that from
                                                          // happening and should not be worried about at this level.
    static int8_t cell_index_y(const float &y) {
      const int8_t cy = (y - (MESH_MIN_Y)) * RECIPROCAL(MESH_Y_DIST);
      return constrain(cy, 0, (GRID_MAX_POINTS_Y) - 1);   // -1 is appropriate if we want all movement to the Y_MAX
    }                                                     // position. But with this defined this way, it is possible
                                                          // to extrapolate off of this point even further out. Probably
                                                          // that is OK because something else should be keeping that from
                                                          // happening and should not be worried about at this level.

    static inline xy_int8_t cell_indexes(const float &x, const float &y) {
      return { cell_index_x(x), cell_index_y(y) };
    }
    static inline xy_int8_t cell_indexes(const xy_pos_t &xy) { return cell_indexes(xy.x, xy.y); }

    static int8_t closest_x_index(const float &x) {
      const int8_t px = (x - (MESH_MIN_X) + (MESH_X_DIST) * 0.5) * RECIPROCAL(MESH_X_DIST);
      return WITHIN(px, 0, GRID_MAX_POINTS_X - 1) ? px : -1;
    }
    static int8_t closest_y_index(const float &y) {
      const int8_t py = (y - (MESH_MIN_Y) + (MESH_Y_DIST) * 0.5) * RECIPROCAL(MESH_Y_DIST);
      return WITHIN(py, 0, GRID_MAX_POINTS_Y - 1) ? py : -1;
    }
    static inline xy_int8_t closest_indexes(const xy_pos_t &xy) {
      return { closest_x_index(xy.x), closest_y_index(xy.y) };
    }

    /**
     *                           z2   --|
     *                 z0        |      |
     *                  |        |      + (z2-z1)
     *   z1             |        |      |
     * ---+-------------+--------+--  --|
     *   a1            a0        a2
     *    |<---delta_a---------->|
     *
     *  calc_z0 is the basis for all the Mesh Based correction. It is used to
     *  find the expected Z Height at a position between two known Z-Height locations.
     *
     *  It is fairly expensive with its 4 floating point additions and 2 floating point
     *  multiplications.
     */
    FORCE_INLINE static float calc_z0(const float &a0, const float &a1, const float &z1, const float &a2, const float &z2) {
      return z1 + (z2 - z1) * (a0 - a1) / (a2 - a1);
    }

    /**
     * z_correction_for_x_on_horizontal_mesh_line is an optimization for
     * the case where the printer is making a vertical line that only crosses horizontal mesh lines.
     */
    static inline float z_correction_for_x_on_horizontal_mesh_line(const float &rx0, const int x1_i, const int yi) {
      if (!WITHIN(x1_i, 0, GRID_MAX_POINTS_X - 1) || !WITHIN(yi, 0, GRID_MAX_POINTS_Y - 1)) {

        if (DEBUGGING(LEVELING)) {
          if (WITHIN(x1_i, 0, GRID_MAX_POINTS_X - 1)) DEBUG_ECHOPGM("yi"); else DEBUG_ECHOPGM("x1_i");
          DEBUG_ECHOLNPAIR(" out of bounds in z_correction_for_x_on_horizontal_mesh_line(rx0=", rx0, ",x1_i=", x1_i, ",yi=", yi, ")");
        }

        // The requested location is off the mesh. Return UBL_Z_RAISE_WHEN_OFF_MESH or NAN.
        return (
          #ifdef UBL_Z_RAISE_WHEN_OFF_MESH
            UBL_Z_RAISE_WHEN_OFF_MESH
          #else
            NAN
          #endif
        );
      }

      const float xratio = (rx0 - mesh_index_to_xpos(x1_i)) * RECIPROCAL(MESH_X_DIST),
                  z1 = z_values[x1_i][yi];

      return z1 + xratio * (z_values[_MIN(x1_i, GRID_MAX_POINTS_X - 2) + 1][yi] - z1); // Don't allow x1_i+1 to be past the end of the array
                                                                                      // If it is, it is clamped to the last element of the
                                                                                      // z_values[][] array and no correction is applied.
    }

    //
    // See comments above for z_correction_for_x_on_horizontal_mesh_line
    //
    static inline float z_correction_for_y_on_vertical_mesh_line(const float &ry0, const int xi, const int y1_i) {
      if (!WITHIN(xi, 0, GRID_MAX_POINTS_X - 1) || !WITHIN(y1_i, 0, GRID_MAX_POINTS_Y - 1)) {

        if (DEBUGGING(LEVELING)) {
          if (WITHIN(xi, 0, GRID_MAX_POINTS_X - 1)) DEBUG_ECHOPGM("y1_i"); else DEBUG_ECHOPGM("xi");
          DEBUG_ECHOLNPAIR(" out of bounds in z_correction_for_y_on_vertical_mesh_line(ry0=", ry0, ", xi=", xi, ", y1_i=", y1_i, ")");
        }

        // The requested location is off the mesh. Return UBL_Z_RAISE_WHEN_OFF_MESH or NAN.
        return (
          #ifdef UBL_Z_RAISE_WHEN_OFF_MESH
            UBL_Z_RAISE_WHEN_OFF_MESH
          #else
            NAN
          #endif
        );
      }

      const float yratio = (ry0 - mesh_index_to_ypos(y1_i)) * RECIPROCAL(MESH_Y_DIST),
                  z1 = z_values[xi][y1_i];

      return z1 + yratio * (z_values[xi][_MIN(y1_i, GRID_MAX_POINTS_Y - 2) + 1] - z1); // Don't allow y1_i+1 to be past the end of the array
                                                                                      // If it is, it is clamped to the last element of the
                                                                                      // z_values[][] array and no correction is applied.
    }

    /**
     * This is the generic Z-Correction. It works anywhere within a Mesh Cell. It first
     * does a linear interpolation along both of the bounding X-Mesh-Lines to find the
     * Z-Height at both ends. Then it does a linear interpolation of these heights based
     * on the Y position within the cell.
     */
    static float get_z_correction(const float &rx0, const float &ry0) {
      const int8_t cx = cell_index_x(rx0), cy = cell_index_y(ry0); // return values are clamped

      /**
       * Check if the requested location is off the mesh.  If so, and
       * UBL_Z_RAISE_WHEN_OFF_MESH is specified, that value is returned.
       */
      #ifdef UBL_Z_RAISE_WHEN_OFF_MESH
        if (!WITHIN(rx0, MESH_MIN_X, MESH_MAX_X) || !WITHIN(ry0, MESH_MIN_Y, MESH_MAX_Y))
          return UBL_Z_RAISE_WHEN_OFF_MESH;
      #endif

      const float z1 = calc_z0(rx0,
                               mesh_index_to_xpos(cx), z_values[cx][cy],
                               mesh_index_to_xpos(cx + 1), z_values[_MIN(cx, GRID_MAX_POINTS_X - 2) + 1][cy]);

      const float z2 = calc_z0(rx0,
                               mesh_index_to_xpos(cx), z_values[cx][_MIN(cy, GRID_MAX_POINTS_Y - 2) + 1],
                               mesh_index_to_xpos(cx + 1), z_values[_MIN(cx, GRID_MAX_POINTS_X - 2) + 1][_MIN(cy, GRID_MAX_POINTS_Y - 2) + 1]);

      float z0 = calc_z0(ry0,
                         mesh_index_to_ypos(cy), z1,
                         mesh_index_to_ypos(cy + 1), z2);

      if (DEBUGGING(MESH_ADJUST)) {
        DEBUG_ECHOPAIR(" raw get_z_correction(", rx0);
        DEBUG_CHAR(','); DEBUG_ECHO(ry0);
        DEBUG_ECHOPAIR_F(") = ", z0, 6);
        DEBUG_ECHOLNPAIR_F(" >>>---> ", z0, 6);
      }

      if (isnan(z0)) { // if part of the Mesh is undefined, it will show up as NAN
        z0 = 0.0;      // in ubl.z_values[][] and propagate through the
                       // calculations. If our correction is NAN, we throw it out
                       // because part of the Mesh is undefined and we don't have the
                       // information we need to complete the height correction.

        if (DEBUGGING(MESH_ADJUST)) {
          DEBUG_ECHOPAIR("??? Yikes!  NAN in get_z_correction(", rx0);
          DEBUG_CHAR(',');
          DEBUG_ECHO(ry0);
          DEBUG_CHAR(')');
          DEBUG_EOL();
        }
      }
      return z0;
    }
    static inline float get_z_correction(const xy_pos_t &pos) { return get_z_correction(pos.x, pos.y); }

    static inline float mesh_index_to_xpos(const uint8_t i) {
      return i < GRID_MAX_POINTS_X ? pgm_read_float(&_mesh_index_to_xpos[i]) : MESH_MIN_X + i * (MESH_X_DIST);
    }
    static inline float mesh_index_to_ypos(const uint8_t i) {
      return i < GRID_MAX_POINTS_Y ? pgm_read_float(&_mesh_index_to_ypos[i]) : MESH_MIN_Y + i * (MESH_Y_DIST);
    }

    #if UBL_SEGMENTED
      static bool line_to_destination_segmented(const feedRate_t &scaled_fr_mm_s);
    #else
      static void line_to_destination_cartesian(const feedRate_t &scaled_fr_mm_s, const uint8_t e);
    #endif

    static inline bool mesh_is_valid() {
      GRID_LOOP(x, y) if (isnan(z_values[x][y])) return false;
      return true;
    }

}; // class unified_bed_leveling

extern unified_bed_leveling ubl;

#define _GET_MESH_X(I) ubl.mesh_index_to_xpos(I)
#define _GET_MESH_Y(J) ubl.mesh_index_to_ypos(J)
#define Z_VALUES_ARR ubl.z_values

// Prevent debugging propagating to other files
#include "../../../core/debug_out.h"
