#ifndef OT_GLYF_GLYPH_HH

#define OT_GLYF_GLYPH_HH

#include "../../hb-open-type.hh"

#include "GlyphHeader.hh"

#include "SimpleGlyph.hh"

#include "CompositeGlyph.hh"

namespace OT {

struct glyf_accelerator_t;

namespace glyf_impl {

enum phantom_point_index_t

{

  PHANTOM_LEFT   = 0,

  PHANTOM_RIGHT  = 1,

  PHANTOM_TOP    = 2,

  PHANTOM_BOTTOM = 3,

  PHANTOM_COUNT  = 4

};

struct Glyph

{

  enum glyph_type_t {

    EMPTY,

    SIMPLE,

    COMPOSITE,

  };

  public:

  composite_iter_t get_composite_iterator () const

  {

    if (type != COMPOSITE) return composite_iter_t ();

    return CompositeGlyph (*header, bytes, extended).iter ();

  }

  const hb_bytes_t trim_padding () const

  {

    switch (type) {

    case COMPOSITE: return CompositeGlyph (*header, bytes, extended).trim_padding ();

    case SIMPLE:    return SimpleGlyph (*header, bytes).trim_padding ();

    case EMPTY:     return bytes;

    default:        return bytes;

    }

  }

  void drop_hints ()

  {

    switch (type) {

    case COMPOSITE: CompositeGlyph (*header, bytes, extended).drop_hints (); return;

    case SIMPLE:    SimpleGlyph (*header, bytes).drop_hints (); return;

    case EMPTY:

      if (bytes.length >= GlyphHeader::static_size)

        SimpleGlyph (*header, bytes).drop_hints ();

      return;

    }

  }

  void set_overlaps_flag ()

  {

    switch (type) {

    case COMPOSITE: CompositeGlyph (*header, bytes, extended).set_overlaps_flag (); return;

    case SIMPLE:    SimpleGlyph (*header, bytes).set_overlaps_flag (); return;

    case EMPTY:     return;

    }

  }

  void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const

  {

    switch (type) {

    case COMPOSITE: CompositeGlyph (*header, bytes, extended).drop_hints_bytes (dest_start); return;

    case SIMPLE:    SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return;

    case EMPTY:

      dest_start = bytes;

      dest_end = hb_bytes_t ();

      if (bytes.length >= GlyphHeader::static_size &&

          SimpleGlyph (*header, bytes).has_instructions_length ())

        SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end);

      return;

    }

  }

  bool is_composite () const

  { return type == COMPOSITE; }

  bool get_all_points_without_var (const hb_face_t *face,

                                   contour_point_vector_t &points /* OUT */) const

  {

    switch (type) {

    case SIMPLE:

      if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (points, extended)))

        return false;

      break;

    case COMPOSITE:

    {

      for (auto &item : get_composite_iterator ())

        if (unlikely (!item.get_points (points, extended))) return false;

      break;

    }

    case EMPTY:

      break;

    }

    /* Init phantom points */

    if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false;

    hb_array_t<contour_point_t> phantoms = points.as_array ().sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);

    {

      // Duplicated code.

      int lsb = 0;

      face->table.hmtx->get_leading_bearing_without_var_unscaled (gid, &lsb);

      int h_delta = (int) header->xMin - lsb;

      HB_UNUSED int tsb = 0;

#ifndef HB_NO_VERTICAL

      face->table.vmtx->get_leading_bearing_without_var_unscaled (gid, &tsb);

#endif

      int v_orig  = (int) header->yMax + tsb;

      unsigned h_adv = face->table.hmtx->get_advance_without_var_unscaled (gid);

      unsigned v_adv =

#ifndef HB_NO_VERTICAL

                       face->table.vmtx->get_advance_without_var_unscaled (gid)

#else

                       - face->get_upem ()

#endif

                       ;

      phantoms[PHANTOM_LEFT].x = h_delta;

      phantoms[PHANTOM_RIGHT].x = (int) h_adv + h_delta;

      phantoms[PHANTOM_TOP].y = v_orig;

      phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv;

    }

    return true;

  }

  void update_mtx (const hb_subset_plan_t *plan,

                   int xMin, int xMax,

                   int yMin, int yMax,

                   const contour_point_vector_t &all_points) const

  {

    hb_codepoint_t new_gid = 0;

    if (!plan->new_gid_for_old_gid (gid, &new_gid))

      return;

    if (type != EMPTY)

    {

      plan->bounds_width_vec[new_gid] = xMax - xMin;

      plan->bounds_height_vec[new_gid] = yMax - yMin;

    }

    unsigned len = all_points.length;

    float leftSideX = all_points[len - 4].x;

    float rightSideX = all_points[len - 3].x;

    float topSideY = all_points[len - 2].y;

    float bottomSideY = all_points[len - 1].y;

    uint32_t hash = hb_hash (new_gid);

    signed hori_aw = roundf (rightSideX - leftSideX);

    if (hori_aw < 0) hori_aw = 0;

    int lsb = roundf (xMin - leftSideX);

    plan->hmtx_map.set_with_hash (new_gid, hash, hb_pair ((unsigned) hori_aw, lsb));

    //flag value should be computed using non-empty glyphs

    if (type != EMPTY && lsb != xMin)

      plan->head_maxp_info.allXMinIsLsb = false;

    signed vert_aw = roundf (topSideY - bottomSideY);

    if (vert_aw < 0) vert_aw = 0;

    int tsb = roundf (topSideY - yMax);

    plan->vmtx_map.set_with_hash (new_gid, hash, hb_pair ((unsigned) vert_aw, tsb));

  }

  bool compile_header_bytes (const hb_subset_plan_t *plan,

                             const contour_point_vector_t &all_points,

                             hb_bytes_t &dest_bytes /* OUT */) const

  {

    GlyphHeader *glyph_header = nullptr;

    if (type != EMPTY && all_points.length >= 4)

    {

      glyph_header = (GlyphHeader *) hb_calloc (1, GlyphHeader::static_size);

      if (unlikely (!glyph_header)) return false;

    }

    float xMin = 0, xMax = 0;

    float yMin = 0, yMax = 0;

    if (all_points.length > 4)

    {

      xMin = xMax = all_points[0].x;

      yMin = yMax = all_points[0].y;

      unsigned count = all_points.length - 4;

      for (unsigned i = 1; i < count; i++)

      {

  float x = all_points[i].x;

  float y = all_points[i].y;

  xMin = hb_min (xMin, x);

  xMax = hb_max (xMax, x);

  yMin = hb_min (yMin, y);

  yMax = hb_max (yMax, y);

      }

    }

    // These are destined for storage in a 16 bit field to clamp the values to

    // fit into a 16 bit signed integer.

    int rounded_xMin = hb_clamp (roundf (xMin), -32768.0f, 32767.0f);

    int rounded_xMax = hb_clamp (roundf (xMax), -32768.0f, 32767.0f);

    int rounded_yMin = hb_clamp (roundf (yMin), -32768.0f, 32767.0f);

    int rounded_yMax = hb_clamp (roundf (yMax), -32768.0f, 32767.0f);

    update_mtx (plan, rounded_xMin, rounded_xMax, rounded_yMin, rounded_yMax, all_points);

    if (type != EMPTY)

    {

      plan->head_maxp_info.xMin = hb_min (plan->head_maxp_info.xMin, rounded_xMin);

      plan->head_maxp_info.yMin = hb_min (plan->head_maxp_info.yMin, rounded_yMin);

      plan->head_maxp_info.xMax = hb_max (plan->head_maxp_info.xMax, rounded_xMax);

      plan->head_maxp_info.yMax = hb_max (plan->head_maxp_info.yMax, rounded_yMax);

    }

    /* Empty glyphs only include phantom points; update metrics and return. */

    if (!glyph_header)

      return true;

    glyph_header->numberOfContours = header->numberOfContours;

    glyph_header->xMin = rounded_xMin;

    glyph_header->yMin = rounded_yMin;

    glyph_header->xMax = rounded_xMax;

    glyph_header->yMax = rounded_yMax;

    dest_bytes = hb_bytes_t ((const char *)glyph_header, GlyphHeader::static_size);

    return true;

  }

  bool compile_bytes_with_deltas (const hb_subset_plan_t *plan,

                                  hb_font_t *font,

                                  const glyf_accelerator_t &glyf,

                                  hb_bytes_t &dest_start,  /* IN/OUT */

                                  hb_bytes_t &dest_end /* OUT */)

  {

    contour_point_vector_t all_points, points_with_deltas;

    unsigned composite_contours = 0;

    head_maxp_info_t *head_maxp_info_p = &plan->head_maxp_info;

    unsigned *composite_contours_p = &composite_contours;

    // don't compute head/maxp values when glyph has no contours(type is EMPTY)

    // also ignore .notdef glyph when --notdef-outline is not enabled

    if (type == EMPTY ||

        (gid == 0 && !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE)))

    {

      head_maxp_info_p = nullptr;

      composite_contours_p = nullptr;

    }

    hb_glyf_scratch_t scratch;

    if (!get_points (font, glyf, all_points, scratch, &points_with_deltas, head_maxp_info_p, composite_contours_p, false, false))

      return false;

    // .notdef, set type to empty so we only update metrics and don't compile bytes for

    // it

    if (gid == 0 &&

        !(plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE))

    {

      type = EMPTY;

      dest_start = hb_bytes_t ();

      dest_end = hb_bytes_t ();

    }

    // Recompile even at default: a previous partial instance may have

    // rounded component offsets and child points independently.

    switch (type)

    {

    case COMPOSITE:

      if (!CompositeGlyph (*header, bytes, extended).compile_bytes_with_deltas (dest_start,

                      points_with_deltas,

                      dest_end))

        return false;

      break;

    case SIMPLE:

      if (!SimpleGlyph (*header, bytes).compile_bytes_with_deltas (all_points,

                     plan->flags & HB_SUBSET_FLAGS_NO_HINTING,

                     dest_end))

        return false;

      break;

    case EMPTY:

      dest_start = hb_bytes_t ();

      dest_end = hb_bytes_t ();

      /* Zero-contour glyphs may carry instructions for phantom points.

       * Copy them into owned memory like the other compiled glyphs. */

      if (!(plan->flags & HB_SUBSET_FLAGS_NO_HINTING) &&

          bytes.length >= GlyphHeader::static_size &&

          header->numberOfContours == 0)

      {

        SimpleGlyph simple (*header, bytes);

        unsigned length = simple.instructions_length ();

        if (length)

        {

          length = simple.length (length);

          char *p = (char *) hb_malloc (length);

          if (unlikely (!p)) return false;

          hb_memcpy (p, bytes.arrayZ, length);

          dest_start = hb_bytes_t (p, length);

        }

      }

      break;

    }

    if (!compile_header_bytes (plan, all_points, dest_start))

    {

      dest_end.fini ();

      return false;

    }

    return true;

  }

  /* Note: Recursively calls itself.

   * all_points includes phantom points

   */

  template <typename accelerator_t>

  bool get_points (hb_font_t *font, const accelerator_t &glyf_accelerator,

       contour_point_vector_t &all_points /* OUT */,

       hb_glyf_scratch_t &scratch,

       contour_point_vector_t *points_with_deltas = nullptr, /* OUT */

       head_maxp_info_t * head_maxp_info = nullptr, /* OUT */

       unsigned *composite_contours = nullptr, /* OUT */

       bool shift_points_hori = true,

       bool use_my_metrics = true,

       bool phantom_only = false,

       hb_array_t<const int> coords = hb_array_t<const int> (),

       hb_scalar_cache_t *gvar_cache = nullptr,

       unsigned int depth = 0,

       unsigned *edge_count = nullptr,

       int64_t *budget = nullptr) const

  {

    if (unlikely (depth > HB_MAX_NESTING_LEVEL)) return false;

    unsigned stack_edge_count = 0;

    if (!edge_count) edge_count = &stack_edge_count;

    if (unlikely (*edge_count > HB_MAX_GRAPH_EDGE_COUNT)) return false;

    (*edge_count)++;

    int64_t stack_budget = HB_BUDGET_GLYPH;

    if (!budget) budget = &stack_budget;

    if (unlikely (!hb_budget_spend (*budget, HB_BUDGET_16))) return false;

    if (head_maxp_info)

    {

      head_maxp_info->maxComponentDepth = hb_max (head_maxp_info->maxComponentDepth, depth);

    }

    if (!coords && font->has_nonzero_coords)

      coords = hb_array (font->coords, font->num_coords);

    contour_point_vector_t &points = type == SIMPLE ? all_points : scratch.comp_points;

    unsigned old_length = points.length;

    switch (type) {

    case SIMPLE:

      if (depth == 0 && head_maxp_info)

        head_maxp_info->maxContours = hb_max (head_maxp_info->maxContours, (unsigned) header->numberOfContours);

      if (depth > 0 && composite_contours)

        *composite_contours += (unsigned) header->numberOfContours;

      if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (all_points, extended, phantom_only, budget)))

  return false;

      break;

    case COMPOSITE:

    {

      for (auto &item : get_composite_iterator ())

      {

        /* Preparing a component is a traversal step, even if cycle

         * detection later skips its child glyph. */

        if (unlikely (!hb_budget_spend (*budget, HB_BUDGET_16) ||

                      !item.get_points (points, extended)))

        {

          points.resize (old_length);

          return false;

        }

      }

      break;

    }

    case EMPTY:

      break;

    }

    /* Init phantom points */

    if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false;

    hb_array_t<contour_point_t> phantoms = points.as_array ().sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);

    {

      // Duplicated code.

      int lsb = 0;

      glyf_accelerator.hmtx->get_leading_bearing_without_var_unscaled (gid, &lsb);

      int h_delta = (int) header->xMin - lsb;

      HB_UNUSED int tsb = 0;

#ifndef HB_NO_VERTICAL

      glyf_accelerator.vmtx->get_leading_bearing_without_var_unscaled (gid, &tsb);

#endif

      int v_orig  = (int) header->yMax + tsb;

      unsigned h_adv = glyf_accelerator.hmtx->get_advance_without_var_unscaled (gid);

      unsigned v_adv =

#ifndef HB_NO_VERTICAL

                       glyf_accelerator.vmtx->get_advance_without_var_unscaled (gid)

#else

                       - font->face->get_upem ()

#endif

                       ;

      phantoms[PHANTOM_LEFT].x = h_delta;

      phantoms[PHANTOM_RIGHT].x = (int) h_adv + h_delta;

      phantoms[PHANTOM_TOP].y = v_orig;

      phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv;

    }

#ifndef HB_NO_VAR

    if (hb_any (coords))

    {

      if (!glyf_accelerator.gvar->apply_deltas_to_points (gid,

                coords,

                points.as_array ().sub_array (old_length),

                scratch,

                gvar_cache,

                phantom_only && type == SIMPLE,

                budget))

        return false;

    }

#endif

    // mainly used by CompositeGlyph calculating new X/Y offset value so no need to extend it

    // with child glyphs' points

    if (points_with_deltas != nullptr && depth == 0 && type == COMPOSITE)

    {

      assert (old_length == 0);

      *points_with_deltas = points;

    }

    float shift = 0;

    switch (type) {

    case SIMPLE:

      if (depth == 0 && head_maxp_info)

        head_maxp_info->maxPoints = hb_max (head_maxp_info->maxPoints, all_points.length - old_length - 4);

      shift = phantoms[PHANTOM_LEFT].x;

      break;

    case COMPOSITE:

    {

      hb_decycler_node_t decycler_node (scratch.decycler);

      unsigned int comp_index = 0;

      for (auto &item : get_composite_iterator ())

      {

  hb_codepoint_t item_gid = item.get_gid (extended);

        if (unlikely (!decycler_node.visit (item_gid)))

  {

    comp_index++;

    continue;

  }

  unsigned old_count = all_points.length;

  if (unlikely ((!phantom_only || (use_my_metrics && item.is_use_my_metrics ())) &&

          !glyf_accelerator.glyph_for_gid (item_gid)

               .get_points (font,

                glyf_accelerator,

                all_points,

                scratch,

                points_with_deltas,

                head_maxp_info,

                composite_contours,

                shift_points_hori,

                use_my_metrics,

                phantom_only,

                coords,

                gvar_cache,

                depth + 1,

                edge_count,

                budget)))

  {

    points.resize (old_length);

    return false;

  }

  // points might have been reallocated. Relocate phantoms.

  phantoms = points.as_array ().sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);

  auto comp_points = all_points.as_array ().sub_array (old_count);

  /* Copy phantom points from component if USE_MY_METRICS flag set */

  if (use_my_metrics && item.is_use_my_metrics ())

    for (unsigned int i = 0; i < PHANTOM_COUNT; i++)

      phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i];

  /* Each composite level transforms the whole subtree below it;

   * charge that work here so deep nesting is bounded by the budget

   * rather than by the per-draw point cap alone. */

  if (unlikely (!hb_budget_spend (*budget, HB_BUDGET_1, comp_points.length)))

  {

    points.resize (old_length);

    return false;

  }

  if (comp_points) // Empty in case of phantom_only

  {

    float matrix[4];

    contour_point_t default_trans;

    item.get_transformation (matrix, default_trans, extended);

    /* Apply component transformation & translation (with deltas applied) */

    item.transform_points (comp_points, matrix, points[old_length + comp_index]);

  }

  if (item.is_anchored () && !phantom_only)

  {

    unsigned int p1, p2;

    item.get_anchor_points (p1, p2, extended);

    if (likely (p1 < all_points.length && p2 < comp_points.length))

    {

      contour_point_t delta;

      delta.init (all_points[p1].x - comp_points[p2].x,

      all_points[p1].y - comp_points[p2].y);

      item.translate (delta, comp_points);

    }

  }

  all_points.resize (all_points.length - PHANTOM_COUNT);

  if (all_points.length > HB_GLYF_MAX_POINTS)

  {

    points.resize (old_length);

    return false;

  }

  comp_index++;

      }

      if (head_maxp_info && depth == 0)

      {

        if (composite_contours)

          head_maxp_info->maxCompositeContours = hb_max (head_maxp_info->maxCompositeContours, *composite_contours);

        head_maxp_info->maxCompositePoints = hb_max (head_maxp_info->maxCompositePoints, all_points.length);

        head_maxp_info->maxComponentElements = hb_max (head_maxp_info->maxComponentElements, comp_index);

      }

      all_points.extend (phantoms);

      shift = phantoms[PHANTOM_LEFT].x;

      points.resize (old_length);

    } break;

    case EMPTY:

      all_points.extend (phantoms);

      shift = phantoms[PHANTOM_LEFT].x;

      points.resize (old_length);

      break;

    }

    if (depth == 0 && shift_points_hori) /* Apply at top level */

    {

      /* Undocumented rasterizer behavior:

       * Shift points horizontally by the updated left side bearing

       */

      if (shift)

        for (auto &point : all_points)

    point.x -= shift;

    }

    return !all_points.in_error ();

  }

  bool get_extents_without_var_scaled (hb_font_t *font, const glyf_accelerator_t &glyf_accelerator,

               hb_glyph_extents_t *extents) const

  {

    if (type == EMPTY)

    {

      *extents = {0, 0, 0, 0};

      return true; /* Empty glyph; zero extents. */

    }

    return header->get_extents_without_var_scaled (font, glyf_accelerator, gid, extents);

  }

  hb_bytes_t get_bytes () const { return bytes; }

  glyph_type_t get_type () const { return type; }

  const GlyphHeader *get_header () const { return header; }

  bool is_extended () const { return extended; }

  Glyph () : bytes (),

             header (bytes.as<GlyphHeader> ()),

             gid (-1),

             type(EMPTY),

       extended (false)

  {}

  Glyph (hb_bytes_t bytes_,

   hb_codepoint_t gid_,

   bool extended_) : bytes (bytes_),

         header (bytes.as<GlyphHeader> ()),

         gid (gid_),

         extended (extended_)

  {

    int num_contours = header->numberOfContours;

    if (unlikely (num_contours == 0)) type = EMPTY;

    else if (num_contours > 0) type = SIMPLE;

    else if (num_contours <= -1) type = COMPOSITE;

    else type = EMPTY; // Spec deviation; Spec says COMPOSITE, but not seen in the wild.

  }

  protected:

  hb_bytes_t bytes;

  const GlyphHeader *header;

  hb_codepoint_t gid;

  glyph_type_t type;

  bool extended;

};

} /* namespace glyf_impl */

} /* namespace OT */

#endif /* OT_GLYF_GLYPH_HH */