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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2016 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>

#include "string.h"
#include "allocator.h"

sstr_t sstr(char *cstring) {
    sstr_t string;
    string.ptr = cstring;
    string.length = strlen(cstring);
    return string;
}

sstr_t sstrn(char *cstring, size_t length) {
    sstr_t string;
    string.ptr = cstring;
    string.length = length;
    return string;
}

size_t sstrnlen(size_t n, sstr_t s, ...) {
    va_list ap;
    size_t size = s.length;
    va_start(ap, s);

    for (size_t i = 1 ; i < n ; i++) {
        sstr_t str = va_arg(ap, sstr_t);
        size += str.length;
    }
    va_end(ap);

    return size;
}

static sstr_t sstrvcat_a(
        UcxAllocator *a,
        size_t count,
        sstr_t s1,
        sstr_t s2,
        va_list ap) {
    sstr_t str;
    str.ptr = NULL;
    str.length = 0;
    if(count < 2) {
        return str;
    }
    
    sstr_t *strings = (sstr_t*) calloc(count, sizeof(sstr_t));
    if(!strings) {
        return str;
    }
    
    // get all args and overall length
    strings[0] = s1;
    strings[1] = s2;
    size_t strlen = s1.length + s2.length;
    for (size_t i=2;i<count;i++) {
        sstr_t s = va_arg (ap, sstr_t);
        strings[i] = s;
        strlen += s.length;
    }
    
    // create new string
    str.ptr = (char*) almalloc(a, strlen + 1);
    str.length = strlen;
    if(!str.ptr) {
        free(strings);
        str.length = 0;
        return str;
    }
    
    // concatenate strings
    size_t pos = 0;
    for (size_t i=0;i<count;i++) {
        sstr_t s = strings[i];
        memcpy(str.ptr + pos, s.ptr, s.length);
        pos += s.length;
    }
    
    str.ptr[str.length] = '\0';
    
    free(strings);
    
    return str;
}

sstr_t sstrcat(size_t count, sstr_t s1, sstr_t s2, ...) {
    va_list ap;
    va_start(ap, s2);
    sstr_t s = sstrvcat_a(ucx_default_allocator(), count, s1, s2, ap);
    va_end(ap);
    return s;
}

sstr_t sstrcat_a(UcxAllocator *a, size_t count, sstr_t s1, sstr_t s2, ...) {
    va_list ap;
    va_start(ap, s2);
    sstr_t s = sstrvcat_a(a, count, s1, s2, ap);
    va_end(ap);
    return s;
}

sstr_t sstrsubs(sstr_t s, size_t start) {
    return sstrsubsl (s, start, s.length-start);
}

sstr_t sstrsubsl(sstr_t s, size_t start, size_t length) {
    sstr_t new_sstr;
    if (start >= s.length) {
        new_sstr.ptr = NULL;
        new_sstr.length = 0;
    } else {
        if (length > s.length-start) {
            length = s.length-start;
        }
        new_sstr.ptr = &s.ptr[start];
        new_sstr.length = length;
    }
    return new_sstr;
}

sstr_t sstrchr(sstr_t s, int c) {
    for(size_t i=0;i<s.length;i++) {
        if(s.ptr[i] == c) {
            return sstrsubs(s, i);
        }
    }
    sstr_t n;
    n.ptr = NULL;
    n.length = 0;
    return n;
}

sstr_t sstrrchr(sstr_t s, int c) {
    if (s.length > 0) {
        for(size_t i=s.length;i>0;i--) {
            if(s.ptr[i-1] == c) {
                return sstrsubs(s, i-1);
            }
        }
    }
    sstr_t n;
    n.ptr = NULL;
    n.length = 0;
    return n;
}

sstr_t sstrstr(sstr_t string, sstr_t match) {
    if (match.length == 0) {
        return string;
    }
    
    for (size_t i = 0 ; i < string.length ; i++) {
        sstr_t substr = sstrsubs(string, i);
        if (sstrprefix(substr, match)) {
            return substr;
        }
    }
    
    sstr_t emptystr;
    emptystr.length = 0;
    emptystr.ptr = NULL;
    return emptystr;
}

sstr_t* sstrsplit(sstr_t s, sstr_t d, ssize_t *n) {
    return sstrsplit_a(ucx_default_allocator(), s, d, n);
}

sstr_t* sstrsplit_a(UcxAllocator *allocator, sstr_t s, sstr_t d, ssize_t *n) {
    if (s.length == 0 || d.length == 0) {
        *n = -1;
        return NULL;
    }

    sstr_t* result;
    ssize_t nmax = *n;
    *n = 1;

    /* special case: exact match - no processing needed */
    if (sstrcmp(s, d) == 0) {
        *n = 0;
        return NULL;
    }
    sstr_t sv = sstrdup(s);
    if (sv.length == 0) {
        *n = -2;
        return NULL;
    }

    for (size_t i = 0 ; i < s.length ; i++) {
        sstr_t substr = sstrsubs(sv, i);
        if (sstrprefix(substr, d)) {
            (*n)++;
            for (size_t j = 0 ; j < d.length ; j++) {
                sv.ptr[i+j] = 0;
            }
            i += d.length - 1; // -1, because the loop will do a i++
        }
        if ((*n) == nmax) break;
    }
    result = (sstr_t*) almalloc(allocator, sizeof(sstr_t)*(*n));

    if (result) {
        char *pptr = sv.ptr;
        for (ssize_t i = 0 ; i < *n ; i++) {
            size_t l = strlen(pptr);
            char* ptr = (char*) almalloc(allocator, l + 1);
            if (ptr) {
                memcpy(ptr, pptr, l);
                ptr[l] = 0;

                result[i] = sstrn(ptr, l);
                pptr += l + d.length;
            } else {
                for (ssize_t j = i-1 ; j >= 0 ; j--) {
                    alfree(allocator, result[j].ptr);
                }
                alfree(allocator, result);
                *n = -2;
                break;
            }
        }
    } else {
        *n = -2;
    }
    
    free(sv.ptr);

    return result;
}

int sstrcmp(sstr_t s1, sstr_t s2) {
    if (s1.length == s2.length) {
        return memcmp(s1.ptr, s2.ptr, s1.length);
    } else if (s1.length > s2.length) {
        return 1;
    } else {
        return -1;
    }
}

int sstrcasecmp(sstr_t s1, sstr_t s2) {
    if (s1.length == s2.length) {
#ifdef _WIN32
        return _strnicmp(s1.ptr, s2.ptr, s1.length);
#else
        return strncasecmp(s1.ptr, s2.ptr, s1.length);
#endif
    } else if (s1.length > s2.length) {
        return 1;
    } else {
        return -1;
    }
}

sstr_t sstrdup(sstr_t s) {
    return sstrdup_a(ucx_default_allocator(), s);
}

sstr_t sstrdup_a(UcxAllocator *allocator, sstr_t s) {
    sstr_t newstring;
    newstring.ptr = (char*)almalloc(allocator, s.length + 1);
    if (newstring.ptr) {
        newstring.length = s.length;
        newstring.ptr[newstring.length] = 0;
        
        memcpy(newstring.ptr, s.ptr, s.length);
    } else {
        newstring.length = 0;
    }
    
    return newstring;
}

sstr_t sstrtrim(sstr_t string) {
    sstr_t newstr = string;
    
    while (newstr.length > 0 && isspace(*newstr.ptr)) {
        newstr.ptr++;
        newstr.length--;
    }
    while (newstr.length > 0 && isspace(newstr.ptr[newstr.length-1])) {
        newstr.length--;
    }
    
    return newstr;
}

int sstrprefix(sstr_t string, sstr_t prefix) {
    if (string.length == 0) {
        return prefix.length == 0;
    }
    if (prefix.length == 0) {
        return 1;
    }
    
    if (prefix.length > string.length) {
        return 0;
    } else {
        return memcmp(string.ptr, prefix.ptr, prefix.length) == 0;
    }
}

int sstrsuffix(sstr_t string, sstr_t suffix) {
    if (string.length == 0) {
        return suffix.length == 0;
    }
    if (suffix.length == 0) {
        return 1;
    }
    
    if (suffix.length > string.length) {
        return 0;
    } else {
        return memcmp(string.ptr+string.length-suffix.length,
            suffix.ptr, suffix.length) == 0;
    }
}

sstr_t sstrlower(sstr_t string) {
    sstr_t ret = sstrdup(string);
    for (size_t i = 0; i < ret.length ; i++) {
        ret.ptr[i] = tolower(ret.ptr[i]);
    }
    return ret;
}

sstr_t sstrlower_a(UcxAllocator *allocator, sstr_t string) {
    sstr_t ret = sstrdup_a(allocator, string);
    for (size_t i = 0; i < ret.length ; i++) {
        ret.ptr[i] = tolower(ret.ptr[i]);
    }
    return ret;
}

sstr_t sstrupper(sstr_t string) {
    sstr_t ret = sstrdup(string);
    for (size_t i = 0; i < ret.length ; i++) {
        ret.ptr[i] = toupper(ret.ptr[i]);
    }
    return ret;
}

sstr_t sstrupper_a(UcxAllocator *allocator, sstr_t string) {
    sstr_t ret = sstrdup_a(allocator, string);
    for (size_t i = 0; i < ret.length ; i++) {
        ret.ptr[i] = toupper(ret.ptr[i]);
    }
    return ret;
}