#include <stdarg.h>

char* tempvl(const char *fmt, va_list vl) {
    va_list copy;
    va_copy(copy, vl);
    int sz = /*stbsp_*/vsnprintf( 0, 0, fmt, copy ) + 1;
    va_end(copy);

    int reqlen = sz;
#if 0
    int heap = 0;
    enum { STACK_ALLOC = 16384 };
    static __thread char buf[STACK_ALLOC];
#else
    int heap = 1;
    static __thread int STACK_ALLOC = 512*1024;
    static __thread char *buf = 0; if(!buf) buf = REALLOC(0, STACK_ALLOC); // @leak
#endif
    static __thread int cur = 0; //printf("string stack %d/%d\n", cur, STACK_ALLOC);

    if( reqlen >= STACK_ALLOC ) {
        tty_color(RED);
        printf("no stack enough, increase STACK_ALLOC variable above (reqlen:%d) (fmt: %s)\n", reqlen, fmt);
        tty_color(0);
        //assert(reqlen < STACK_ALLOC);
        STACK_ALLOC = reqlen * 2;
        buf = REALLOC(0, STACK_ALLOC);
    }

    char* ptr = buf + (cur *= (cur+reqlen) < (STACK_ALLOC - 1), (cur += reqlen) - reqlen);

    /*stbsp_*/vsnprintf( ptr, sz, fmt, vl );
    return (char *)ptr;
}
char* tempva(const char *fmt, ...) {
    va_list vl;
    va_start(vl, fmt);
    char *s = tempvl(fmt, vl);
    va_end(vl);
    return s;
}

char* (strcatf)(char **src_, const char *buf) {
    char *src = *src_;
        if(!buf) return src;
        // if(!buf[0]) return src;
        int srclen = (src ? strlen(src) : 0), buflen = strlen(buf);
        src = (char*)REALLOC(src, srclen + buflen + 1 );
        memcpy(src + srclen, buf, buflen + 1 );
    *src_ = src;
    return src;
}

// -----------------------------------------------------------------------------
// string utils

int strmatch(const char *s, const char *wildcard) {
    // returns true if wildcard matches
    if( *wildcard=='\0' ) return !*s;
    if( *wildcard=='*' )  return strmatch(s, wildcard+1) || (*s && strmatch(s+1, wildcard));
    if( *wildcard=='?' )  return *s && (*s != '.') && strmatch(s+1, wildcard+1);
    return (*s == *wildcard) && strmatch(s+1, wildcard+1);
}
int strmatchi(const char *s, const char *wildcard) {
    return strmatch(strlower(s), strlower(wildcard));
}

int strcmp_qsort(const void *a, const void *b) {
    const char **ia = (const char **)a;
    const char **ib = (const char **)b;
    return strcmp(*ia, *ib);
}
int strcmpi_qsort(const void *a, const void *b) {
    const char **ia = (const char **)a;
    const char **ib = (const char **)b;
    return strcmpi(*ia, *ib);
}

bool strbeg(const char *a, const char *b) { // returns true if both strings match at beginning. case sensitive
    return strncmp(a, b, strlen(b)) ? false : true; // strstr(a,b) == a
}
bool strend(const char *a, const char *b) { // returns true if both strings match at end. case sensitive
    int la = strlen(a), lb = strlen(b);
    if( la < lb ) return false;
    return strncmp(a + la - lb, b, lb) ? false : true;
}
/*
int main() {
    printf("strbeg(abc abc) = %d\n", strbeg("abc", "abc"));
    printf("strbeg(abc abcd) = %d\n", strbeg("abc", "abcd"));
    printf("strbeg(abcd abc) = %d\n", strbeg("abcd", "abc"));
    printf("strbeg(abc (empty)) = %d\n", strbeg("abc", ""));
    printf("strbeg((empty) abc) = %d\n", strbeg("", "abc"));
    printf("strbeg(123 abcd) = %d\n", strbeg("123", "abcd"));
    printf("strbeg(abcd 123) = %d\n", strbeg("abcd", "123"));
    puts("---");
    printf("strend(abc abc) = %d\n", strend("abc", "abc"));
    printf("strend(abc 0abc) = %d\n", strend("abc", "0abc"));
    printf("strend(abcd bcd) = %d\n", strend("abcd", "bcd"));
    printf("strend(abc (empty)) = %d\n", strend("abc", ""));
    printf("strend((empty) abc) = %d\n", strend("", "abc"));
    printf("strend(123 abcd) = %d\n", strend("123", "abcd"));
    printf("strend(abcd 123) = %d\n", strend("abcd", "123"));
}
*/

bool strbegi(const char *a, const char *b) { // returns true if both strings match at beginning. case insensitive
    int la = strlen(a), lb = strlen(b);
    if( la < lb ) return 0;
    if( lb == 0 ) return 1;
    int len = la < lb ? la : lb;
    for( int i = 0; i < len; ++i ) {
        if( tolower(a[i]) != tolower(b[i]) ) {
            return false;
        }
    }
    return true;
}
bool strendi(const char *src, const char *sub) { // returns true if both strings match at end. case insensitive
    int srclen = strlen(src);
    int sublen = strlen(sub);
    if( sublen > srclen ) return 0;
    return !strcmpi(src + srclen - sublen, sub);
}


// Find substring in string, case insensitive. Alias for strcasestr()
// Returns first char of coincidence, or NULL.
const char *strstri( const char *src, const char *sub ){
    while( *src++ ) {
        for( const char *s = src-1, *f = sub, *c = s; ; ++f, ++c) {
            if(!*f) return s;
            if(!*c) return NULL;
            if(tolower(*c) != tolower(*f)) break;
        }
    }
    return NULL;
}

char *strupper(const char *str) {
    char *s = va("%s", str), *bak = s;
    while(*s++) s[-1] = toupper(s[-1]);
    return bak;
}
char *strlower(const char *str) {
    char *s = va("%s", str), *bak = s;
    while(*s++) s[-1] = tolower(s[-1]);
    return bak;
}

#ifndef __APPLE__ // BSD provides these
// Safely concatenate two strings. Always NUL terminates (unless dstcap == 0).
// Returns length of operation; if retval >= dstcap, truncation occurred.
size_t strlcat(char *dst, const char *src, size_t dstcap) {
    int dl = strlen(dst), sl = strlen(src);
    if( dstcap ) snprintf(dst + dl, dstcap - dl, "%s", src);
    return dl + sl;
}
// Safely copy two strings. Always NUL terminates (unless dstcap == 0).
// Copy src to string dst of size dstcap. Copies at most dstcap-1 characters.
// Returns length of input; if retval >= dstcap, truncation occurred.
size_t strlcpy(char *dst, const char *src, size_t dstcap) {
    int sl = strlen(src);
    if( dstcap ) snprintf(dst, dstcap, "%*s", sl, src);
    return sl;// count does not include NUL
}
#endif

char *string8(const wchar_t *str) { // from wchar16(win) to utf8/ascii
    int i = 0, n = wcslen(str) * 6 - 1;
    static __thread char error[1] = {0}, buffer[2048]; assert( n < 2048 );
    while( *str ) {
       if (*str < 0x80) {
          if (i+1 > n) return error;
          buffer[i++] = (char) *str++;
       } else if (*str < 0x800) {
          if (i+2 > n) return error;
          buffer[i++] = 0xc0 + (*str >> 6);
          buffer[i++] = 0x80 + (*str & 0x3f);
          str += 1;
       } else if (*str >= 0xd800 && *str < 0xdc00) {
          uint32_t c;
          if (i+4 > n) return error;
          c = ((str[0] - 0xd800) << 10) + ((str[1]) - 0xdc00) + 0x10000;
          buffer[i++] = 0xf0 + (c >> 18);
          buffer[i++] = 0x80 + ((c >> 12) & 0x3f);
          buffer[i++] = 0x80 + ((c >>  6) & 0x3f);
          buffer[i++] = 0x80 + ((c      ) & 0x3f);
          str += 2;
       } else if (*str >= 0xdc00 && *str < 0xe000) {
          return error;
       } else {
          if (i+3 > n) return error;
          buffer[i++] = 0xe0 + (*str >> 12);
          buffer[i++] = 0x80 + ((*str >> 6) & 0x3f);
          buffer[i++] = 0x80 + ((*str     ) & 0x3f);
          str += 1;
       }
    }
    buffer[i] = 0;
    return va("%s", buffer);
}

char *strrepl(char **string, const char *target, const char *replace) { // may reallocate input string if needed
    //if new text is shorter than old one,then no need to heap, replace inline
    int rlen = strlen(replace), tlen = strlen(target), diff = tlen - rlen;
    if( diff >= 0 ) return strswap(*string, target, replace);

    char *buf = 0, *aux = *string;
    for( int tgtlen = tlen; tgtlen && aux[0]; ) {
        char *found = strstr(aux, target);
        if( found ) {
            strcatf(&buf, "%.*s%s", (int)(found - aux), aux, replace);
            aux += (found - aux) + tgtlen;
        } else {
            strcatf(&buf, "%s", aux);
            break;
        }
    }
    if( buf ) {
        // strcpy(*string, buf);
        char *s = *string;
        if(s) s[0] = 0;
        strcatf(&s, "%s", buf);
        *string = s;

        FREE( buf );
    }
    return *string;
}
char *strswap(char *copy, const char *target, const char *replace) { // replaced only if new text is shorter than old one
    int rlen = strlen(replace), diff = strlen(target) - rlen;
    if( diff >= 0 ) {
        for( char *s = copy, *e = s + strlen(copy); /*s < e &&*/ 0 != (s = strstr(s, target)); ) {
            if( rlen ) s = (char*)memcpy( s, replace, rlen ) + rlen;
            if( diff ) memmove( s, s + diff, (e - (s + diff)) + 1 );
        }
    }
    return copy;
}
char *strcut(char *copy, const char *target) {
    return strswap(copy, target, "");
}

const char *strlerp(unsigned numpairs, const char **pairs, const char *str) { // using key-value pairs, null-terminated
    if( !pairs[0] ) {
        return str;
    }
    // find & replace all tokens; @fixme: optimize me
    char *buf = REALLOC(0, 128*1024); strcpy(buf, str);
    for( unsigned i = 0; i < numpairs; ++i ) {
        const char *token = pairs[i*2+0];
        const char *repl = pairs[i*2+1];
        while(strstr(buf, token)) {
            strrepl(&buf, token, repl);
        }
    }
    char *ret = va("%s", buf);
    FREE(buf);
    return ret;
}

array(char*) strsplit(const char *str, const char *separators) {
    enum { SLOTS = 32 };
    static __thread int slot = 0;
    static __thread char *buf[SLOTS] = {0};
    static __thread array(char*) list[SLOTS] = {0};

    slot = (slot+1) % SLOTS;
    array_resize(list[slot], 0);
    *(buf[slot] = REALLOC(buf[slot], strlen(str)*2+1)) = '\0'; // *2 to backup pathological case where input str is only separators && include == 1

    for(char *dst = buf[slot]; str && *str; ) {
        // count literal run && terminators
        int run = strcspn(str, separators);
        int end = strspn(str + run, separators);

        // append literal run
        if( run ) {
            array_push(list[slot], dst);
            memmove(dst,str,run); dst[run] = '\0'; //strncpy(dst, str, run)
            dst += run + 1;
        }
#if defined SPLIT_INCLUDE_SEPARATORS && SPLIT_INCLUDE_SEPARATORS
        // mode: append all separators: "1++2" -> "1" "+" "+" "2"
        for( int i = 0; i < end; ++i ) {
            array_push(list[slot], dst);
            dst[0] = str[ run + i ];
            dst[1] = '\0';
            dst += 2;
        }
#endif

        // skip both
        str += run + end;
    }

    return list[slot];
}
char* strjoin(array(char*) list, const char *separator) {
    enum { SLOTS = 16 };
    static __thread int slot = 0;
    static __thread char* mems[SLOTS] = {0};

    slot = (slot+1) % SLOTS;

    int num_list = array_count(list);
    int len = 0, inc = 0, seplen = strlen(separator);
    for( int i = 0; (num_list > 0 ? i < num_list : !!list[i]); ++i ) {
        len += strlen(list[i]) + inc;
        inc = seplen;
    }

    mems[slot] = REALLOC(mems[slot], len+1);
    char *p = mems[slot]; *p = 0;
    const char *sep = "";
    for( int i = 0; (num_list > 0 ? i < num_list : !!list[i]); ++i ) {
        p += sprintf(p, "%s%s", sep, list[i]);
        sep = separator;
    }

    return mems[slot];
}

static
const char *extract_utf32(const char *s, uint32_t *out) {
    /**/ if( (s[0] & 0x80) == 0x00 ) return *out = (s[0]), s + 1;
    else if( (s[0] & 0xe0) == 0xc0 ) return *out = (s[0] & 31) <<  6 | (s[1] & 63), s + 2;
    else if( (s[0] & 0xf0) == 0xe0 ) return *out = (s[0] & 15) << 12 | (s[1] & 63) <<  6 | (s[2] & 63), s + 3;
    else if( (s[0] & 0xf8) == 0xf0 ) return *out = (s[0] &  7) << 18 | (s[1] & 63) << 12 | (s[2] & 63) << 8 | (s[3] & 63), s + 4;
    return *out = 0, s + 0;
}
array(uint32_t) string32( const char *utf8 ) {
    static __thread int slot = 0; slot = (slot+1) % 16;
    static __thread array(uint32_t) out[16] = {0}; array_resize(out[slot], 0);

    //int worstlen = strlen(utf8) + 1; array_reserve(out, worstlen);
    while( *utf8 ) {
        uint32_t unicode = 0;
        utf8 = extract_utf32( utf8, &unicode );
        array_push(out[slot], unicode);
    }
    return out[slot];
}

const char* codepoint_to_utf8(unsigned c) { //< @r-lyeh
    static char s[4+1];
    memset(s, 0, 5);
    /**/ if (c <     0x80) s[0] = c, s[1] = 0;
    else if (c <    0x800) s[0] = 0xC0 | ((c >>  6) & 0x1F), s[1] = 0x80 | ( c        & 0x3F), s[2] = 0;
    else if (c <  0x10000) s[0] = 0xE0 | ((c >> 12) & 0x0F), s[1] = 0x80 | ((c >>  6) & 0x3F), s[2] = 0x80 | ( c        & 0x3F), s[3] = 0;
    else if (c < 0x110000) s[0] = 0xF0 | ((c >> 18) & 0x07), s[1] = 0x80 | ((c >> 12) & 0x3F), s[2] = 0x80 | ((c >>  6) & 0x3F), s[3] = 0x80 | (c & 0x3F), s[4] = 0;
    return s;
}

// -----------------------------------------------------------------------------
// quarks

unsigned quark_intern( quarks_db *q, const char *string ) {
    if( string && string[0] ) {
        int slen = strlen(string);
        int qlen = array_count(q->blob);
        char *found;
        if( !qlen ) {
            array_resize(q->blob, slen + 1 );
            memcpy(found = q->blob, string, slen + 1);
        } else {
            found = strstr(q->blob, string);
            if( !found ) {
                array_resize(q->blob, qlen - 1 + slen + 1);
                memcpy(found = q->blob + qlen - 1, string, slen + 1 );
            }
        }
        // already interned? return that instead
        vec2i offset_len = vec2i(found - q->blob, slen);
        for( int i = 0; i < array_count(q->entries); ++i ) {
            if( offset_len.x == q->entries[i].x )
                if( offset_len.y == q->entries[i].y )
                    return i+1;
        }
        // else cache and return it
        array_push(q->entries, offset_len);
        return array_count(q->entries);
    }
    return 0;
}
const char *quark_string( quarks_db *q, unsigned key ) {
    if( key && key <= array_count(q->entries) ) {
        vec2i offset_len = q->entries[key-1];
        return va("%.*s", offset_len.y, q->blob + offset_len.x);
    }
    return "";
}

static __thread quarks_db qdb;
unsigned intern( const char *string ) {
    return quark_intern( &qdb, string );
}
const char *quark( unsigned key ) {
    return quark_string( &qdb, key );
}

#if 0
AUTORUN {
    test( !intern(NULL) ); // quark #0, cannot intern null string
    test( !intern("") );   // quark #0, ok to intern empty string
    test( !quark(0)[0] );  // empty string for quark #0

    unsigned q1 = intern("Hello");  // -> quark #1
    unsigned q2 = intern("happy");  // -> quark #2
    unsigned q3 = intern("world."); // -> quark #3
    printf("%u %u %u\n", q1, q2, q3);

    test( q1 );
    test( q2 );
    test( q3 );
    test( q1 != q2 );
    test( q1 != q3 );
    test( q2 != q3 );

    unsigned q4 = intern("happy");
    printf("%x vs %x\n", q2, q4);
    test( q4 );
    test( q4 == q2 );

    char buf[256];
    sprintf(buf, "%s %s %s", quark(q1), quark(q2), quark(q3));
    test( !strcmp("Hello happy world.", buf) );
}
#endif

// ----------------------------------------------------------------------------
// localization kit

static const char *kit_lang = "enUS", *kit_langs =
    "enUS,enGB,"
    "frFR,"
    "esES,esAR,esMX,"
    "deDE,deCH,deAT,"
    "itIT,itCH,"
    "ptBR,ptPT,"
    "zhCN,zhSG,zhTW,zhHK,zhMO,"
    "ruRU,elGR,trTR,daDK,noNB,svSE,nlNL,plPL,fiFI,jaJP,"
    "koKR,csCZ,huHU,roRO,thTH,bgBG,heIL"
;

static map(char*,char*) kit_ids;
static map(char*,char*) kit_vars;

#ifndef KIT_FMT_ID2
#define KIT_FMT_ID2 "%s.%s"
#endif

void kit_init() {
    do_once map_init(kit_ids, less_str, hash_str);
    do_once map_init(kit_vars, less_str, hash_str);
}

void kit_insert( const char *id, const char *translation) {
    char *id2 = va(KIT_FMT_ID2, kit_lang, id);

    char **found = map_find_or_add_allocated_key(kit_ids, STRDUP(id2), NULL);
    if(*found) FREE(*found);
    *found = STRDUP(translation);
}

bool kit_merge( const char *filename ) {
    // @todo: xlsx2ini
    return false;
}

void kit_clear() {
    map_clear(kit_ids);
}

bool kit_load( const char *filename ) {
    return kit_clear(), kit_merge( filename );
}

void kit_set( const char *key, const char *value ) {
    value = value && value[0] ? value : "";

    char **found = map_find_or_add_allocated_key(kit_vars, STRDUP(key), NULL );
    if(*found) FREE(*found);
    *found = STRDUP(value);
}

void kit_reset() {
    map_clear(kit_vars);
}

char *kit_translate2( const char *id, const char *lang ) {
    char *id2 = va(KIT_FMT_ID2, lang, id);

    char **found = map_find(kit_ids, id2);

    // return original [[ID]] if no translation is found
    if( !found ) return va("[[%s]]", id);

    // return translation if no {{moustaches}} are found
    if( !strstr(*found, "{{") ) return *found;

    // else replace all found {{moustaches}} with context vars
    {
        // make room
        static __thread char *results[16] = {0};
        static __thread unsigned counter = 0; counter = (counter+1) % 16;

        char *buffer = results[ counter ];
        if( buffer ) FREE(buffer), buffer = 0;

        // iterate moustaches
        const char *begin, *end, *text = *found;
        while( NULL != (begin = strstr(text, "{{")) ) {
            end = strstr(begin+2, "}}");
            if( end ) {
                char *var = va("%.*s", (int)(end - (begin+2)), begin+2);
                char **found_var = map_find(kit_vars, var);

                if( found_var && 0[*found_var] ) {
                    strcatf(&buffer, "%.*s%s", (int)(begin - text), text, *found_var);
                } else {
                    strcatf(&buffer, "%.*s{{%s}}", (int)(begin - text), text, var);
                }

                text = end+2;
            } else {
                strcatf(&buffer, "%.*s", (int)(begin - text), text);

                text = begin+2;
            }
        }

        strcatf(&buffer, "%s", text);
        return buffer;
    }
}

char *kit_translate( const char *id ) {
    return kit_translate2( id, kit_lang );
}

void kit_locale( const char *lang ) {
    kit_lang = STRDUP(lang); // @leak
}

void kit_dump_state( FILE *fp ) {
    for each_map(kit_ids, char *, k, char *, v) {
        fprintf(fp, "[ID ] %s=%s\n", k, v);
    }
    for each_map(kit_vars, char *, k, char *, v) {
        fprintf(fp, "[VAR] %s=%s\n", k, v);
    }
}

/*
int main() {
    kit_init();

    kit_locale("enUS");
    kit_insert("HELLO_PLAYERS", "Hi {{PLAYER1}} and {{PLAYER2}}!");
    kit_insert("GREET_PLAYERS", "Nice to meet you.");

    kit_locale("esES");
    kit_insert("HELLO_PLAYERS", "Hola {{PLAYER1}} y {{PLAYER2}}!");
    kit_insert("GREET_PLAYERS", "Un placer conoceros.");

    kit_locale("enUS");
    printf("%s %s\n", kit_translate("HELLO_PLAYERS"), kit_translate("GREET_PLAYERS")); // Hi {{PLAYER1}} and {{PLAYER2}}! Nice to meet you.

    kit_locale("esES");
    kit_set("PLAYER1", "John");
    kit_set("PLAYER2", "Karl");
    printf("%s %s\n", kit_translate("HELLO_PLAYERS"), kit_translate("GREET_PLAYERS")); // Hola John y Karl! Un placer conoceros.

    assert( 0 == strcmp(kit_translate("NON_EXISTING"), "[[NON_EXISTING]]")); // [[NON_EXISTING]]
    assert(~puts("Ok"));
}
*/