#include <event.h>

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
#include <bio.h>
#include "proof.h"

char fname[NFONT][20]; /* font names */
char lastload[NFONT][20]; /* last file name prefix loaded for this font */
Font *fonttab[NFONT][NSIZE]; /* pointers to fonts */
int fmap[NFONT]; /* what map to use with this font */

static void bufchar(Point, Subfont *, uchar *);
static void loadfont(int, int);
static void fontlookup(int, char *);
static void buildxheight(Biobuf*);
static void buildmap(Biobuf*);
static void buildtroff(char *);
static void addmap(int, char *, int);
static char *map(Rune*, int);
static void scanstr(char *, char *, char **);

int specfont; /* somehow, number of special font */

#define NMAP 5
#define QUICK 2048 /* char values less than this are quick to look up */
#define eq(s,t) strcmp((char *) s, (char *) t) == 0

int curmap = -1; /* what map are we working on */

typedef struct Link Link;
struct Link /* link names together */
{
uchar *name;
int val;
Link *next;
};

typedef struct Map Map;
struct Map /* holds a mapping from uchar name to index */
{
double xheight;
Rune quick[QUICK]; /* low values get special treatment */
Link *slow; /* other stuff goes into a link list */
};

Map charmap[5];

typedef struct Fontmap Fontmap;
struct Fontmap /* mapping from troff name to filename */
{
char *troffname;
char *prefix;
int map; /* which charmap to use for this font */
char *fallback; /* font to look in if can't find char here */
};

Fontmap fontmap[100];
int pos2fontmap[NFONT]; /* indexed by troff font position, gives Fontmap */
int nfontmap = 0; /* how many are there */

void
dochar(Rune r[])
{
char *s, *fb;
Font *f;
Point p;
int fontno, fm, i;
char buf[10];

fontno = curfont;
if((s = map(r, curfont)) == 0){ /* not on current font */
if ((s = map(r, specfont)) != 0) /* on special font */
fontno = specfont;
else{
/* look for fallback */
fm = pos2fontmap[curfont];
fb = fontmap[fm].fallback;
if(fb){
/* see if fallback is mounted */
for(i = 0; i < NFONT; i++){
if(eq(fb, fontmap[pos2fontmap[i]].troffname)){
s = map(r, i);
if(s){
fontno = i;
goto found;
}
}
}
}
/* no such char; use name itself on defont */
/* this is not a general solution */
p.x = hpos/DIV + xyoffset.x + offset.x;
p.y = vpos/DIV + xyoffset.y + offset.y;
p.y -= font->ascent;
sprint(buf, "%S", r);
string(screen, p, display->black, ZP, font, buf);
return;
}
}
found:
p.x = hpos/DIV + xyoffset.x + offset.x;
p.y = vpos/DIV + xyoffset.y + offset.y;
while ((f = fonttab[fontno][cursize]) == 0)
loadfont(fontno, cursize);
p.y -= f->ascent;
dprint(2, "putting %S at %d,%d font %d, size %d\n", r, p.x, p.y, fontno, cursize);
string(screen, p, display->black, ZP, f, s);
}

static void
loadfont(int n, int s)
{
char file[100];
int i, fd, t, deep;
static char *try[3] = {"", "times/R.", "pelm/"};
Subfont *f;
Font *ff;

try[0] = fname[n];
for (t = 0; t < 3; t++){
i = s * mag * charmap[fmap[n]].xheight/0.72; /* a pixel is 0.72 points */
if (i < MINSIZE)
i = MINSIZE;
dprint(2, "size %d, i %d, mag %g\n", s, i, mag);
for(; i >= MINSIZE; i--){
/* if .font file exists, take that */
sprint(file, "%s/%s%d.font", libfont, try[t], i);
ff = openfont(display, file);
if(ff != 0){
fonttab[n][s] = ff;
dprint(2, "using %s for font %d %d\n", file, n, s);
return;
}
/* else look for a subfont file */
for (deep = log2[screen->depth]; deep >= 0; deep--){
sprint(file, "%s/%s%d.%d", libfont, try[t], i, deep);
dprint(2, "trying %s for %d\n", file, i);
if ((fd = open(file, 0)) >= 0){
f = readsubfont(display, file, fd, 0);
if (f == 0) {
fprint(2, "can't rdsubfontfile %s: %r\n", file);
exits("rdsubfont");
}
close(fd);
ff = mkfont(f, 0);
if(ff == 0){
fprint(2, "can't mkfont %s: %r\n", file);
exits("rdsubfont");
}
fonttab[n][s] = ff;
dprint(2, "using %s for font %d %d\n", file, n, s);
return;
}
}
}
}
fprint(2, "can't find font %s.%d or substitute, quitting\n", fname[n], s);
exits("no font");
}

void
loadfontname(int n, char *s)
{
int i;
Font *f, *g = 0;

if (strcmp(s, fname[n]) == 0)
return;
if(fname[n] && fname[n][0]){
if(lastload[n] && strcmp(lastload[n], fname[n]) == 0)
return;
strcpy(lastload[n], fname[n]);
}
fontlookup(n, s);
for (i = 0; i < NSIZE; i++)
if (f = fonttab[n][i]){
if (f != g) {
freefont(f);
g = f;
}
fonttab[n][i] = 0;
}
}

void
allfree(void)
{
int i;

for (i=0; i<NFONT; i++)
loadfontname(i, "??");
}

void
readmapfile(char *file)
{
Biobuf *fp;
char *p, cmd[100];

if ((fp=Bopen(file, OREAD)) == 0){
fprint(2, "proof: can't open map file %s\n", file);
exits("urk");
}
while((p=Brdline(fp, '\n')) != 0) {
p[Blinelen(fp)-1] = 0;
scanstr(p, cmd, 0);
if(p[0]=='\0' || eq(cmd, "#")) /* skip comments, empty */
continue;
else if(eq(cmd, "xheight"))
buildxheight(fp);
else if(eq(cmd, "map"))
buildmap(fp);
else if(eq(cmd, "special"))
buildtroff(p);
else if(eq(cmd, "troff"))
buildtroff(p);
else
fprint(2, "weird map line %s\n", p);
}
Bterm(fp);
}

static void
buildxheight(Biobuf *fp) /* map goes from char name to value to print via *string() */
{
char *line;

line = Brdline(fp, '\n');
if(line == 0){
fprint(2, "proof: bad map file\n");
exits("map");
}
charmap[curmap].xheight = atof(line);
}

static void
buildmap(Biobuf *fp) /* map goes from char name to value to print via *string() */
{
uchar *p, *line, ch[100];
int val;
Rune r;

curmap++;
if(curmap >= NMAP){
fprint(2, "proof: out of char maps; recompile\n");
exits("charmap");
}
while ((line = Brdline(fp, '\n'))!= 0){
if (line[0] == '\n')
return;
line[Blinelen(fp)-1] = 0;
scanstr((char *) line, (char *) ch, (char **) &p);
if (ch[0] == '\0') {
fprint(2, "bad map file line '%s'\n", (char*)line);
continue;
}
val = strtol((char *) p, 0, 10);
dprint(2, "buildmap %s (%x %x) %s %d\n", (char*)ch, ch[0], ch[1], (char*)p, val);
chartorune(&r, (char*)ch);
if(utflen((char*)ch)==1 && r<QUICK)
charmap[curmap].quick[r] = val;
else
addmap(curmap, strdup((char *) ch), val); /* put somewhere else */
}
}

static void
addmap(int n, char *s, int val) /* stick a new link on */
{
Link *p = (Link *) malloc(sizeof(Link));
Link *prev = charmap[n].slow;

if(p == 0)
exits("out of memory in addmap");
p->name = (uchar *) s;
p->val = val;
p->next = prev;
charmap[n].slow = p;
}

static void
buildtroff(char *buf) /* map troff names into bitmap filenames */
{ /* e.g., R -> times/R., I -> times/I., etc. */
char *p, cmd[100], name[200], prefix[400], fallback[100];

scanstr(buf, cmd, &p);
scanstr(p, name, &p);
scanstr(p, prefix, &p);
while(*p!=0 && isspace(*p))
p++;
if(*p != 0){
scanstr(p, fallback, &p);
fontmap[nfontmap].fallback = strdup(fallback);
}else
fontmap[nfontmap].fallback = 0;
fontmap[nfontmap].troffname = strdup(name);
fontmap[nfontmap].prefix = strdup(prefix);
fontmap[nfontmap].map = curmap;
dprint(2, "troff name %s is bitmap %s map %d in slot %d fallback %s\n", name, prefix, curmap, nfontmap, fontmap[nfontmap].fallback? fontmap[nfontmap].fallback : "<null>");
nfontmap++;
}

static void
fontlookup(int n, char *s) /* map troff name of s into position n */
{
int i;

for(i = 0; i < nfontmap; i++)
if (eq(s, fontmap[i].troffname)) {
strcpy(fname[n], fontmap[i].prefix);
fmap[n] = fontmap[i].map;
pos2fontmap[n] = i;
if (eq(s, "S"))
specfont = n;
dprint(2, "font %d %s is %s\n", n, s, fname[n]);
return;
}
/* god help us if this font isn't there */
}

static char *
map(Rune rp[], int font) /* figure out mapping for char in this font */
{
static char s[100];
char c[10];
Link *p;
Rune r;

if(rp[1]==0 && rp[0]<QUICK) /* fast lookup */
r = charmap[fmap[font]].quick[rp[0]];
else { /* high-valued or compound character name */
sprint(c, "%S", rp);
r = 0;
for (p = charmap[fmap[font]].slow; p; p = p->next)
if(eq(c, p->name)){
r = p->val;
break;
}
}
if(r == 0){ /* not there */
dprint(2, "didn't find %S font# %d\n", rp, font);
return 0;
}
dprint(2, "map %S to %s font# %d\n", rp, s, font);
s[runetochar(s, &r)] = 0;
return s;
}

static void
scanstr(char *s, char *ans, char **ep)
{
for (; isspace((uchar) *s); s++)
;
for (; *s!=0 && !isspace((uchar) *s); )
*ans++ = *s++;
*ans = 0;
if (ep)
*ep = s;
}