#include "system.h"

#include <string.h>

#include <stdio.h>

#include <stdlib.h>

#include <wchar.h>

#ifndef M_PI

// some math.h do not have M_PI macros

# define M_PI    3.14159265358979323846  /* pi */

# define M_PI_2  1.57079632679489661923  /* pi/2 */

# define M_PI_4  0.78539816339744830962  /* pi/4 */

# define M_PIl   3.1415926535897932384626433832795029L  /* pi */

# define M_PI_2l 1.5707963267948966192313216916397514L  /* pi/2 */

# define M_PI_4l 0.7853981633974483096156608458198757L  /* pi/4 */

#endif

double pi = M_PI;

int paramCount;

string255 params[MAX_PARAMS];

string255 fpcrtl_copy(string255 s, Integer index, Integer count) {

    string255 result = STRINIT("");

    if (count < 1) {

        return result;

    }

    if (index < 1) {

        index = 1;

    }

    if (index > s.len) {

        return result;

    }

    if (index + count > s.len + 1) {

        count = s.len + 1 - index;

    }

    memcpy(result.str, s.str + index - 1, count);

    result.len = count;

    return result;

}

astring fpcrtl_copyA(astring s, Integer index, Integer count) {

    astring result;

    result.len = 0;

    if (count < 1) {

        return result;

    }

    if (index < 1) {

        index = 1;

    }

    if (index > s.len) {

        return result;

    }

    if (index + count > s.len + 1) {

        count = s.len + 1 - index;

    }

    memcpy(result.s + 1, s.s + index, count);

    result.len = count;

    return result;

}

void fpcrtl_insert__vars(string255 *src, string255 *dst, SizeInt index) {

    int num_insert;

    int num_shift;

    int num_preshift;

    // nothing to do if empty string is inserted or index invalid

    if ((src->len == 0) || (index < 1) || (index > 255)) {

        return;

    }

    num_insert = src->len;

    // number of chars from start of destination string to end of insertion

    num_preshift = index - 1 + num_insert;

    // don't overflow on insert

    if (num_preshift > 255) {

        num_insert = 255 - (index - 1);

        num_shift = 0;

    }

    // shift trailing chars

    else {

        // number of bytes to be shifted

        num_shift = dst->len - (index - 1);

        if (num_shift > 0) {

            // don't overflow when shifting

            if (num_shift + num_preshift > 255)

                num_shift = 255 - num_preshift;

            // time to move some bytes!

            memmove(dst->str + num_preshift, dst->str + index - 1, num_shift);

        }

    }

    // actual byte insertion

    memmove(dst->str + index - 1, src->str, num_insert);

    // store new length

    dst->len = num_shift + num_preshift;

}

void __attribute__((overloadable)) fpcrtl_delete__vars(string255 *s, SizeInt index, SizeInt count) {

    // number of chars to be move

    int num_move;

    int new_length;

    if (index < 1) {

        // in fpc, if index < 1, the string won't be modified

        return;

    }

    if(index > s->len){

        return;

    }

    if (count > s->len - index + 1) {

        s->len = index - 1;

        return;

    }

    num_move = s->len - index + 1 - count;

    new_length = s->len - count;

    memmove(s->str + index - 1, s->str + index - 1 + count, num_move);

    s->str[new_length] = 0;

    s->len = new_length;

}

void __attribute__((overloadable)) fpcrtl_delete__vars(astring *s, SizeInt index, SizeInt count) {

    // number of chars to be move

    int num_move;

    int new_length;

    if (index < 1) {

        // in fpc, if index < 1, the string won't be modified

        return;

    }

    if(index > s->len){

        return;

    }

    if (count > s->len - index + 1) {

        s->len = index - 1;

        return;

    }

    num_move = s->len - index + 1 - count;

    new_length = s->len - count;

    memmove(s->s + index, s->s + index + count, num_move);

    s->len = new_length;

}

string255 fpcrtl_floatToStr(double n) {

    string255 t;

    sprintf(t.str, "%f", n);

    t.len = strlen(t.str);

    return t;

}

void fpcrtl_move__vars(void *src, void *dst, SizeInt count) {

    memmove(dst, src, count);

}

Integer __attribute__((overloadable)) fpcrtl_pos(Char c, string255 str) {

    unsigned char* p;

    if (str.len == 0) {

        return 0;

    }

    FIX_STRING(str);

    p = strchr(str.str, c);

    if (p == NULL) {

        return 0;

    }

    return p - (unsigned char*)&str.s;

}

Integer __attribute__((overloadable)) fpcrtl_pos(string255 substr, string255 str) {

    unsigned char* p;

    if (str.len == 0) {

        return 0;

    }

    if (substr.len == 0) {

        return 0;

    }

    FIX_STRING(substr);

    FIX_STRING(str);

    p = strstr(str.str, substr.str);

    if (p == NULL) {

        return 0;

    }

    return p - (unsigned char*)&str.s;

}

Integer __attribute__((overloadable)) fpcrtl_pos(Char c, astring str) {

    unsigned char* p;

    if (str.len == 0) {

        return 0;

    }

    p = strchr(str.s + 1, c);

    if (p == NULL) {

        return 0;

    }

    return p - (unsigned char*)&str.s;

}

Integer __attribute__((overloadable)) fpcrtl_pos(string255 substr, astring str) {

    unsigned char* p;

    if (str.len == 0) {

        return 0;

    }

    if (substr.len == 0) {

        return 0;

    }

    FIX_STRING(substr);

    str.s[str.len] = 0;

    p = strstr(str.s + 1, substr.str);

    if (p == NULL) {

        return 0;

    }

    return p - (unsigned char *)&str.s;

}

Integer fpcrtl_length(string255 s) {

    return s.len;

}

Integer fpcrtl_lengthA(astring s)

{

    return s.len;

}

string255 fpcrtl_lowerCase(string255 s) {

    int i;

    for (i = 0; i < s.len; i++) {

        if (s.str[i] >= 'A' && s.str[i] <= 'Z') {

            s.str[i] += 'a' - 'A';

        }

    }

    return s;

}

void fpcrtl_fillChar__vars(void *x, SizeInt count, Byte value) {

    memset(x, value, count);

}

void fpcrtl_new__vars(void **p, int size) {

    *p = malloc(size);

}

Integer fpcrtl_trunc(extended n) {

    return (int) n;

}

Integer fpcrtl_ceil(extended n) {

    return (int) (ceil(n));

}

LongInt str_to_int(char *src)

{

    int i;

    int len = strlen(src);

    char *end;

    for(i = 0; i < len; i++)

    {

        if(src[i] == '$'){

            // hex

            return strtol(src + i + 1, &end, 16);

        }

    }

    // decimal

    return atoi(src);

}

void __attribute__((overloadable)) fpcrtl_val__vars(string255 s, LongInt *a)

{

    FIX_STRING(s);

    *a = str_to_int(s.str);

}

void __attribute__((overloadable)) fpcrtl_val__vars(string255 s, Byte *a)

{

    FIX_STRING(s);

    *a = str_to_int(s.str);

}

void __attribute__((overloadable)) fpcrtl_val__vars(string255 s, LongWord *a)

{

    FIX_STRING(s);

    *a = str_to_int(s.str);

}

LongInt fpcrtl_random(LongInt l) {

    // random(0) is undefined in docs but effectively returns 0 in free pascal

    if (l == 0) {

        printf("WARNING: random(0) called!\n");

        return 0;

    }

    return (LongInt) (rand() / (double) RAND_MAX * l);

}

void __attribute__((overloadable)) fpcrtl_str__vars(float x, string255 *s) {

    sprintf(s->str, "%f", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(double x, string255 *s) {

    sprintf(s->str, "%f", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(uint8_t x, string255 *s) {

    sprintf(s->str, "%u", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(int8_t x, string255 *s) {

    sprintf(s->str, "%d", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(uint16_t x, string255 *s) {

    sprintf(s->str, "%u", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(int16_t x, string255 *s) {

    sprintf(s->str, "%d", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(uint32_t x, string255 *s) {

    sprintf(s->str, "%u", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(int32_t x, string255 *s) {

    sprintf(s->str, "%d", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(uint64_t x, string255 *s) {

    sprintf(s->str, "%llu", x);

    s->len = strlen(s->str);

}

void __attribute__((overloadable)) fpcrtl_str__vars(int64_t x, string255 *s) {

    sprintf(s->str, "%lld", x);

    s->len = strlen(s->str);

}

/*

 * XXX No protection currently!

 */

void fpcrtl_interlockedIncrement__vars(int *i) {

    (*i)++;

}

void fpcrtl_interlockedDecrement__vars(int *i) {

    (*i)--;

}

/*

 * This function should be called when entering main

 */

void fpcrtl_init(int argc, char** argv) {

    int i;

    paramCount = argc;

    printf("ARGC = %d\n", paramCount);

    for (i = 0; i < argc; i++) {

        if (strlen(argv[i]) > 255) {

            assert(0);

        }

        strcpy(params[i].str, argv[i]);

        params[i].len = strlen(params[i].str);

    }

}

int fpcrtl_paramCount() {

    return paramCount - 1; // ignore the first one

}

string255 fpcrtl_paramStr(int i) {

    return params[i];

}

int fpcrtl_UTF8ToUnicode(PWideChar dest, PChar src, SizeInt maxLen) {

    //return swprintf(dest, maxLen, L"%hs", "src"); //doesn't work in emscripten

    return 0;

}

uint32_t __attribute__((overloadable)) fpcrtl_lo(uint64_t i) {

    return (i & 0xFFFFFFFF);

}