/*
 * 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 2
 * 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2008 Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup edutil
 */

#include <math.h>
#include <stdlib.h>
#include <string.h>

#include "MEM_guardedalloc.h"

#include "DNA_armature_types.h"
#include "DNA_mesh_types.h"
#include "DNA_object_types.h"
#include "DNA_packedFile_types.h"
#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"

#include "BLI_listbase.h"
#include "BLI_path_util.h"
#include "BLI_string.h"
#include "BLI_utildefines.h"

#include "BLT_translation.h"

#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_layer.h"
#include "BKE_main.h"
#include "BKE_material.h"
#include "BKE_multires.h"
#include "BKE_object.h"
#include "BKE_packedFile.h"
#include "BKE_paint.h"
#include "BKE_screen.h"
#include "BKE_undo_system.h"
#include "BKE_workspace.h"

#include "DEG_depsgraph.h"

#include "ED_armature.h"
#include "ED_buttons.h"
#include "ED_image.h"
#include "ED_mesh.h"
#include "ED_node.h"
#include "ED_object.h"
#include "ED_outliner.h"
#include "ED_paint.h"
#include "ED_space_api.h"
#include "ED_util.h"

#include "GPU_immediate.h"
#include "GPU_state.h"

#include "UI_interface.h"
#include "UI_resources.h"

#include "RNA_access.h"
#include "WM_api.h"
#include "WM_types.h"

/* ********* general editor util funcs, not BKE stuff please! ********* */

void ED_editors_init_for_undo(Main *bmain)
{
  wmWindowManager *wm = bmain->wm.first;
  LISTBASE_FOREACH (wmWindow *, win, &wm->windows) {
    ViewLayer *view_layer = WM_window_get_active_view_layer(win);
    Base *base = BASACT(view_layer);
    if (base != NULL) {
      Object *ob = base->object;
      if (ob->mode & OB_MODE_TEXTURE_PAINT) {
        Scene *scene = WM_window_get_active_scene(win);

        BKE_texpaint_slots_refresh_object(scene, ob);
        BKE_paint_proj_mesh_data_check(scene, ob, NULL, NULL, NULL, NULL);
      }
    }
  }
}

void ED_editors_init(bContext *C)
{
  struct Depsgraph *depsgraph = CTX_data_expect_evaluated_depsgraph(C);
  Main *bmain = CTX_data_main(C);
  Scene *scene = CTX_data_scene(C);
  wmWindowManager *wm = CTX_wm_manager(C);

  /* This is called during initialization, so we don't want to store any reports */
  ReportList *reports = CTX_wm_reports(C);
  int reports_flag_prev = reports->flag & ~RPT_STORE;

  SWAP(int, reports->flag, reports_flag_prev);

  /* Don't do undo pushes when calling an operator. */
  wm->op_undo_depth++;

  /* toggle on modes for objects that were saved with these enabled. for
   * e.g. linked objects we have to ensure that they are actually the
   * active object in this scene. */
  Object *obact = CTX_data_active_object(C);
  for (Object *ob = bmain->objects.first; ob; ob = ob->id.next) {
    int mode = ob->mode;
    if (mode == OB_MODE_OBJECT) {
      continue;
    }
    else if (BKE_object_has_mode_data(ob, mode)) {
      continue;
    }
    else if (ob->type == OB_GPENCIL) {
      /* For multi-edit mode we may already have mode data (grease pencil does not need it).
       * However we may have a non-active object stuck in a grease-pencil edit mode. */
      if (ob != obact) {
        ob->mode = OB_MODE_OBJECT;
        DEG_id_tag_update(&ob->id, ID_RECALC_COPY_ON_WRITE);
      }
      continue;
    }

    ID *ob_data = ob->data;
    ob->mode = OB_MODE_OBJECT;
    DEG_id_tag_update(&ob->id, ID_RECALC_COPY_ON_WRITE);
    if (obact && (ob->type == obact->type) && !ID_IS_LINKED(ob) &&
        !(ob_data && ID_IS_LINKED(ob_data))) {
      if (mode == OB_MODE_EDIT) {
        ED_object_editmode_enter_ex(bmain, scene, ob, 0);
      }
      else if (mode == OB_MODE_POSE) {
        ED_object_posemode_enter_ex(bmain, ob);
      }
      else if (mode & OB_MODE_ALL_SCULPT) {
        if (obact == ob) {
          if (mode == OB_MODE_SCULPT) {
            ED_object_sculptmode_enter_ex(bmain, depsgraph, scene, ob, true, reports);
          }
          else if (mode == OB_MODE_VERTEX_PAINT) {
            ED_object_vpaintmode_enter_ex(bmain, depsgraph, wm, scene, ob);
          }
          else if (mode == OB_MODE_WEIGHT_PAINT) {
            ED_object_wpaintmode_enter_ex(bmain, depsgraph, wm, scene, ob);
          }
          else {
            BLI_assert(0);
          }
        }
        else {
          /* Create data for non-active objects which need it for
           * mode-switching but don't yet support multi-editing. */
          if (mode & OB_MODE_ALL_SCULPT) {
            ob->mode = mode;
            BKE_object_sculpt_data_create(ob);
          }
        }
      }
      else {
        /* TODO(campbell): avoid operator calls. */
        if (obact == ob) {
          ED_object_mode_toggle(C, mode);
        }
      }
    }
  }

  /* image editor paint mode */
  if (scene) {
    ED_space_image_paint_update(bmain, wm, scene);
  }

  SWAP(int, reports->flag, reports_flag_prev);
  wm->op_undo_depth--;
}

/* frees all editmode stuff */
void ED_editors_exit(Main *bmain, bool do_undo_system)
{
  if (!bmain) {
    return;
  }

  /* frees all editmode undos */
  if (do_undo_system && G_MAIN->wm.first) {
    wmWindowManager *wm = G_MAIN->wm.first;
    /* normally we don't check for NULL undo stack,
     * do here since it may run in different context. */
    if (wm->undo_stack) {
      BKE_undosys_stack_destroy(wm->undo_stack);
      wm->undo_stack = NULL;
    }
  }

  for (Object *ob = bmain->objects.first; ob; ob = ob->id.next) {
    if (ob->type == OB_MESH) {
      Mesh *me = ob->data;
      if (me->edit_mesh) {
        EDBM_mesh_free(me->edit_mesh);
        MEM_freeN(me->edit_mesh);
        me->edit_mesh = NULL;
      }
    }
    else if (ob->type == OB_ARMATURE) {
      bArmature *arm = ob->data;
      if (arm->edbo) {
        ED_armature_edit_free(ob->data);
      }
    }
  }

  /* global in meshtools... */
  ED_mesh_mirror_spatial_table_end(NULL);
  ED_mesh_mirror_topo_table_end(NULL);
}

bool ED_editors_flush_edits_for_object_ex(Main *bmain,
                                          Object *ob,
                                          bool for_render,
                                          bool check_needs_flush)
{
  bool has_edited = false;
  if (ob->mode & OB_MODE_SCULPT) {
    /* Don't allow flushing while in the middle of a stroke (frees data in use).
     * Auto-save prevents this from happening but scripts
     * may cause a flush on saving: T53986. */
    if (ob->sculpt != NULL && ob->sculpt->cache == NULL) {
      char *needs_flush_ptr = &ob->sculpt->needs_flush_to_id;
      if (check_needs_flush && (*needs_flush_ptr == 0)) {
        return false;
      }
      *needs_flush_ptr = 0;

      /* flush multires changes (for sculpt) */
      multires_flush_sculpt_updates(ob);
      has_edited = true;

      if (for_render) {
        /* flush changes from dynamic topology sculpt */
        BKE_sculptsession_bm_to_me_for_render(ob);
      }
      else {
        /* Set reorder=false so that saving the file doesn't reorder
         * the BMesh's elements */
        BKE_sculptsession_bm_to_me(ob, false);
      }
    }
  }
  else if (ob->mode & OB_MODE_EDIT) {

    char *needs_flush_ptr = BKE_object_data_editmode_flush_ptr_get(ob->data);
    if (needs_flush_ptr != NULL) {
      if (check_needs_flush && (*needs_flush_ptr == 0)) {
        return false;
      }
      *needs_flush_ptr = 0;
    }

    /* get editmode results */
    has_edited = true;
    ED_object_editmode_load(bmain, ob);
  }
  return has_edited;
}

bool ED_editors_flush_edits_for_object(Main *bmain, Object *ob)
{
  return ED_editors_flush_edits_for_object_ex(bmain, ob, false, false);
}

/* flush any temp data from object editing to DNA before writing files,
 * rendering, copying, etc. */
bool ED_editors_flush_edits_ex(Main *bmain, bool for_render, bool check_needs_flush)
{
  bool has_edited = false;
  Object *ob;

  /* loop through all data to find edit mode or object mode, because during
   * exiting we might not have a context for edit object and multiple sculpt
   * objects can exist at the same time */
  for (ob = bmain->objects.first; ob; ob = ob->id.next) {
    has_edited |= ED_editors_flush_edits_for_object_ex(bmain, ob, for_render, check_needs_flush);
  }

  bmain->is_memfile_undo_flush_needed = false;

  return has_edited;
}

bool ED_editors_flush_edits(Main *bmain)
{
  return ED_editors_flush_edits_ex(bmain, false, false);
}

/* ***** XXX: functions are using old blender names, cleanup later ***** */

/* now only used in 2d spaces, like time, ipo, nla, sima... */
/* XXX shift/ctrl not configurable */
void apply_keyb_grid(
    int shift, int ctrl, float *val, float fac1, float fac2, float fac3, int invert)
{
  /* fac1 is for 'nothing', fac2 for CTRL, fac3 for SHIFT */
  if (invert) {
    ctrl = !ctrl;
  }

  if (ctrl && shift) {
    if (fac3 != 0.0f) {
      *val = fac3 * floorf(*val / fac3 + 0.5f);
    }
  }
  else if (ctrl) {
    if (fac2 != 0.0f) {
      *val = fac2 * floorf(*val / fac2 + 0.5f);
    }
  }
  else {
    if (fac1 != 0.0f) {
      *val = fac1 * floorf(*val / fac1 + 0.5f);
    }
  }
}

void unpack_menu(bContext *C,
                 const char *opname,
                 const char *id_name,
                 const char *abs_name,
                 const char *folder,
                 struct PackedFile *pf)
{
  Main *bmain = CTX_data_main(C);
  PointerRNA props_ptr;
  uiPopupMenu *pup;
  uiLayout *layout;
  char line[FILE_MAX + 100];
  wmOperatorType *ot = WM_operatortype_find(opname, 1);

  pup = UI_popup_menu_begin(C, IFACE_("Unpack File"), ICON_NONE);
  layout = UI_popup_menu_layout(pup);

  uiItemFullO_ptr(
      layout, ot, IFACE_("Remove Pack"), ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
  RNA_enum_set(&props_ptr, "method", PF_REMOVE);
  RNA_string_set(&props_ptr, "id", id_name);

  if (G.relbase_valid) {
    char local_name[FILE_MAXDIR + FILE_MAX], fi[FILE_MAX];

    BLI_split_file_part(abs_name, fi, sizeof(fi));
    BLI_snprintf(local_name, sizeof(local_name), "//%s/%s", folder, fi);
    if (!STREQ(abs_name, local_name)) {
      switch (BKE_packedfile_compare_to_file(BKE_main_blendfile_path(bmain), local_name, pf)) {
        case PF_CMP_NOFILE:
          BLI_snprintf(line, sizeof(line), TIP_("Create %s"), local_name);
          uiItemFullO_ptr(layout, ot, line, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
          RNA_enum_set(&props_ptr, "method", PF_WRITE_LOCAL);
          RNA_string_set(&props_ptr, "id", id_name);

          break;
        case PF_CMP_EQUAL:
          BLI_snprintf(line, sizeof(line), TIP_("Use %s (identical)"), local_name);
          // uiItemEnumO_ptr(layout, ot, line, 0, "method", PF_USE_LOCAL);
          uiItemFullO_ptr(layout, ot, line, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
          RNA_enum_set(&props_ptr, "method", PF_USE_LOCAL);
          RNA_string_set(&props_ptr, "id", id_name);

          break;
        case PF_CMP_DIFFERS:
          BLI_snprintf(line, sizeof(line), TIP_("Use %s (differs)"), local_name);
          // uiItemEnumO_ptr(layout, ot, line, 0, "method", PF_USE_LOCAL);
          uiItemFullO_ptr(layout, ot, line, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
          RNA_enum_set(&props_ptr, "method", PF_USE_LOCAL);
          RNA_string_set(&props_ptr, "id", id_name);

          BLI_snprintf(line, sizeof(line), TIP_("Overwrite %s"), local_name);
          // uiItemEnumO_ptr(layout, ot, line, 0, "method", PF_WRITE_LOCAL);
          uiItemFullO_ptr(layout, ot, line, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
          RNA_enum_set(&props_ptr, "method", PF_WRITE_LOCAL);
          RNA_string_set(&props_ptr, "id", id_name);
          break;
      }
    }
  }

  switch (BKE_packedfile_compare_to_file(BKE_main_blendfile_path(bmain), abs_name, pf)) {
    case PF_CMP_NOFILE:
      BLI_snprintf(line, sizeof(line), TIP_("Create %s"), abs_name);
      // uiItemEnumO_ptr(layout, ot, line, 0, "method", PF_WRITE_ORIGINAL);
      uiItemFullO_ptr(layout, ot, line, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
      RNA_enum_set(&props_ptr, "method", PF_WRITE_ORIGINAL);
      RNA_string_set(&props_ptr, "id", id_name);
      break;
    case PF_CMP_EQUAL:
      BLI_snprintf(line, sizeof(line), TIP_("Use %s (identical)"), abs_name);
      // uiItemEnumO_ptr(layout, ot, line, 0, "method", PF_USE_ORIGINAL);
      uiItemFullO_ptr(layout, ot, line, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
      RNA_enum_set(&props_ptr, "method", PF_USE_ORIGINAL);
      RNA_string_set(&props_ptr, "id", id_name);
      break;
    case PF_CMP_DIFFERS:
      BLI_snprintf(line, sizeof(line), TIP_("Use %s (differs)"), abs_name);
      // uiItemEnumO_ptr(layout, ot, line, 0, "method", PF_USE_ORIGINAL);
      uiItemFullO_ptr(layout, ot, line, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
      RNA_enum_set(&props_ptr, "method", PF_USE_ORIGINAL);
      RNA_string_set(&props_ptr, "id", id_name);

      BLI_snprintf(line, sizeof(line), TIP_("Overwrite %s"), abs_name);
      // uiItemEnumO_ptr(layout, ot, line, 0, "method", PF_WRITE_ORIGINAL);
      uiItemFullO_ptr(layout, ot, line, ICON_NONE, NULL, WM_OP_EXEC_DEFAULT, 0, &props_ptr);
      RNA_enum_set(&props_ptr, "method", PF_WRITE_ORIGINAL);
      RNA_string_set(&props_ptr, "id", id_name);
      break;
  }

  UI_popup_menu_end(C, pup);
}

/* ********************* generic callbacks for drawcall api *********************** */

/**
 * Callback that draws a line between the mouse and a position given as the initial argument.
 */
void ED_region_draw_mouse_line_cb(const bContext *C, ARegion *region, void *arg_info)
{
  wmWindow *win = CTX_wm_window(C);
  const float *mval_src = (float *)arg_info;
  const float mval_dst[2] = {
      win->eventstate->x - region->winrct.xmin,
      win->eventstate->y - region->winrct.ymin,
  };

  const uint shdr_pos = GPU_vertformat_attr_add(
      immVertexFormat(), "pos", GPU_COMP_F32, 2, GPU_FETCH_FLOAT);

  GPU_line_width(1.0f);

  immBindBuiltinProgram(GPU_SHADER_2D_LINE_DASHED_UNIFORM_COLOR);

  float viewport_size[4];
  GPU_viewport_size_get_f(viewport_size);
  immUniform2f("viewport_size", viewport_size[2] / UI_DPI_FAC, viewport_size[3] / UI_DPI_FAC);

  immUniform1i("colors_len", 0); /* "simple" mode */
  immUniformThemeColor3(TH_VIEW_OVERLAY);
  immUniform1f("dash_width", 6.0f);
  immUniform1f("dash_factor", 0.5f);

  immBegin(GPU_PRIM_LINES, 2);
  immVertex2fv(shdr_pos, mval_src);
  immVertex2fv(shdr_pos, mval_dst);
  immEnd();

  immUnbindProgram();
}

/**
 * Use to free ID references within runtime data (stored outside of DNA)
 *
 * \param new_id: may be NULL to unlink \a old_id.
 */
void ED_spacedata_id_remap(struct ScrArea *area, struct SpaceLink *sl, ID *old_id, ID *new_id)
{
  SpaceType *st = BKE_spacetype_from_id(sl->spacetype);

  if (st && st->id_remap) {
    st->id_remap(area, sl, old_id, new_id);
  }
}

static int ed_flush_edits_exec(bContext *C, wmOperator *UNUSED(op))
{
  Main *bmain = CTX_data_main(C);
  ED_editors_flush_edits(bmain);
  return OPERATOR_FINISHED;
}

void ED_OT_flush_edits(wmOperatorType *ot)
{
  /* identifiers */
  ot->name = "Flush Edits";
  ot->description = "Flush edit data from active editing modes";
  ot->idname = "ED_OT_flush_edits";

  /* api callbacks */
  ot->exec = ed_flush_edits_exec;

  /* flags */
  ot->flag = OPTYPE_INTERNAL;
}
