#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <string.h>

#include <SDL.h>
#include <SDL_opengl.h>

#include <pango/pango.h>
#include <pango/pangofc-fontmap.h>
#include <pango/pangoft2.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>

static PangoContext *context;
static PangoFontMap *fontmap;

typedef struct cf_layout {
  PangoLayout *pl;
  int base_height;
} *CFClient__Layout;

static void
substitute_func (FcPattern *pattern, gpointer data)
{
  //FcPatternAddBool (pattern, FC_HINTING, 1);
  //FcPatternAddBool (pattern, FC_AUTOHINT, 1);
}

static void
layout_update (CFClient__Layout self)
{
  /* use a random scale factor to account for unknown descenders, 0.8 works
   * reasonably well with bitstream vera
   */
  PangoFontDescription *font = pango_context_get_font_description (context);
  pango_font_description_set_absolute_size (font, self->base_height * (PANGO_SCALE * 8 / 10));
}

static void
layout_get_pixel_size (CFClient__Layout self, int *w, int *h)
{
  layout_update (self);

  pango_layout_get_pixel_size (self->pl, w, h);

  *w = (*w + 3) & ~3;
  if (!*w) *w = 1;
  if (!*h) *h = 1;
}

MODULE = CFClient	PACKAGE = CFClient

PROTOTYPES: ENABLE

BOOT:
{
	fontmap = pango_ft2_font_map_new ();
        pango_ft2_font_map_set_default_substitute ((PangoFT2FontMap *)fontmap, substitute_func, 0, 0);
	context = pango_ft2_font_map_create_context ((PangoFT2FontMap *)fontmap);
}

void
lowdelay (int fd, int val = 1)
	CODE:
        setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof (val));

char *
gl_version ()
	CODE:
        RETVAL = (char *)glGetString (GL_VERSION);
	OUTPUT:
        RETVAL

char *
gl_extensions ()
	CODE:
        RETVAL = (char *)glGetString (GL_EXTENSIONS);
	OUTPUT:
        RETVAL

void
add_font (char *file)
	CODE:
        FcConfigAppFontAddFile (0, (const FcChar8 *)file); /* no idea wether this is required */

void
set_font (char *file)
	CODE:
{
        int count;
        FcPattern *pattern = FcFreeTypeQuery ((const FcChar8 *)file, 0, 0, &count);
        PangoFontDescription *font = pango_fc_font_description_from_pattern (pattern, 0);
	FcPatternDestroy (pattern);
        pango_context_set_font_description (context, font);
}

MODULE = CFClient	PACKAGE = CFClient::Layout

CFClient::Layout
new (SV *class, int base_height = 10)
	CODE:
        New (0, RETVAL, 1, struct cf_layout);
        RETVAL->base_height = base_height;
        RETVAL->pl = pango_layout_new (context);
        pango_layout_set_wrap (RETVAL->pl, PANGO_WRAP_WORD_CHAR);
	OUTPUT:
        RETVAL

void
DESTROY (CFClient::Layout self)
	CODE:
        g_object_unref (self->pl);
        Safefree (self);

void
set_markup (CFClient::Layout self, SV *text_)
	CODE:
{
	STRLEN textlen;
        char *text = SvPVutf8 (text_, textlen);

        pango_layout_set_markup (self->pl, text, textlen);
}

void
set_height (CFClient::Layout self, int base_height)
	CODE:
        self->base_height = base_height;

void
set_width (CFClient::Layout self, int max_width = -1)
	CODE:
        pango_layout_set_width (self->pl, max_width < 0 ? max_width : max_width * PANGO_SCALE);

void
size (CFClient::Layout self)
	PPCODE:
{
	int w, h;

        layout_update (self);
        layout_get_pixel_size (self, &w, &h);

        EXTEND (SP, 2);
        PUSHs (sv_2mortal (newSViv (w)));
        PUSHs (sv_2mortal (newSViv (h)));
}

int
xy_to_index (CFClient::Layout self, int x, int y)
	CODE:
{
	int index, trailing;

        layout_update (self);
        pango_layout_xy_to_index (self->pl, x * PANGO_SCALE, y * PANGO_SCALE, &index, &trailing);

        RETVAL = index;
}
	OUTPUT:
        RETVAL

void
cursor_pos (CFClient::Layout self, int index)
	PPCODE:
{
	PangoRectangle strong_pos;
        layout_update (self);
        pango_layout_get_cursor_pos (self->pl, index, &strong_pos, 0);
        EXTEND (SP, 3);
        PUSHs (sv_2mortal (newSViv (strong_pos.x      / PANGO_SCALE)));
        PUSHs (sv_2mortal (newSViv (strong_pos.y      / PANGO_SCALE)));
        PUSHs (sv_2mortal (newSViv (strong_pos.height / PANGO_SCALE)));
}

void
render (CFClient::Layout self)
	PPCODE:
{
        SV *retval;
        int w, h;
        FT_Bitmap bitmap;

        layout_update (self);
        layout_get_pixel_size (self, &w, &h);

        retval = newSV (w * h);
        SvPOK_only (retval);
        SvCUR_set (retval, w * h);

        bitmap.rows       = h;
        bitmap.width      = w;
        bitmap.pitch      = w;
        bitmap.buffer     = (unsigned char*)SvPVX (retval);
        bitmap.num_grays  = 256;
        bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;

        memset (bitmap.buffer, 0, w * h);
            
        pango_ft2_render_layout (&bitmap, self->pl, 0 * PANGO_SCALE, 0 * PANGO_SCALE);

        EXTEND (SP, 3);
        PUSHs (sv_2mortal (newSViv (w)));
        PUSHs (sv_2mortal (newSViv (h)));
        PUSHs (sv_2mortal (retval));
}

MODULE = CFClient	PACKAGE = CFClient::Texture

void
draw_quad (SV *self, double x, double y, double w = 0, double h = 0)
	PROTOTYPE: $$$;$$
	CODE:
{
	HV *hv = (HV *)SvRV (self);
	double s = SvNV (*hv_fetch (hv, "s", 1, 1));
	double t = SvNV (*hv_fetch (hv, "t", 1, 1));
        int name = SvIV (*hv_fetch (hv, "name", 4, 1));

        if (items < 5)
          {
            w = SvNV (*hv_fetch (hv, "w", 1, 1));
            h = SvNV (*hv_fetch (hv, "h", 1, 1));
          }

        glBindTexture (GL_TEXTURE_2D, name);
        glBegin (GL_QUADS);
        glTexCoord2d (0, 0); glVertex2d (x    , y    );
        glTexCoord2d (0, t); glVertex2d (x    , y + h);
        glTexCoord2d (s, t); glVertex2d (x + w, y + h);
        glTexCoord2d (s, 0); glVertex2d (x + w, y    );
        glEnd ();
}