// Type info and methods for CString datatype (char*)

#include <err.h>
#include <gc.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#include "integers.h"
#include "siphash.h"
#include "stdlib.h"
#include "text.h"
#include "util.h"

public
Text_t CString$as_text(const void *c_string, bool colorize, const TypeInfo_t *info) {
    (void)info;
    if (!c_string) return Text("CString");
    Text_t text = Text$from_str(*(const char **)c_string);
    return Text$concat(colorize ? Text("\x1b[34mCString\x1b[m(") : Text("CString("),
                       Text$quoted(text, colorize, Text("\"")), Text(")"));
}

PUREFUNC public int32_t CString$compare(const void *x, const void *y, const TypeInfo_t *info) {
    (void)info;
    if (x == y) return 0;

    if (!*(const char **)x != !*(const char **)y) return (!*(const char **)y) - (!*(const char **)x);

    const char *x_str = *(const char **)x, *y_str = *(const char **)y;
    return (x_str == NULL) || (y_str == NULL) ? (x_str != NULL) - (y_str != NULL) : strcmp(x_str, y_str);
}

PUREFUNC public bool CString$equal(const void *x, const void *y, const TypeInfo_t *type) {
    return CString$compare(x, y, type) == 0;
}

PUREFUNC public uint64_t CString$hash(const void *c_str, const TypeInfo_t *info) {
    (void)info;
    if (!*(const char **)c_str) return 0;
    return siphash24(*(void **)c_str, strlen(*(const char **)c_str));
}

PUREFUNC public bool CString$is_none(const void *c_str, const TypeInfo_t *info) {
    (void)info;
    return *(const char **)c_str == NULL;
}

static void CString$serialize(const void *obj, FILE *out, Table_t *pointers, const TypeInfo_t *info) {
    (void)info;
    const char *str = *(const char **)obj;
    int64_t len = (int64_t)strlen(str);
    Int64$serialize(&len, out, pointers, &Int64$info);
    fwrite(str, sizeof(char), (size_t)len, out);
}

static void CString$deserialize(FILE *in, void *out, List_t *pointers, const TypeInfo_t *info) {
    (void)info;
    int64_t len = -1;
    Int64$deserialize(in, &len, pointers, &Int64$info);
    char *str = GC_MALLOC_ATOMIC((size_t)len + 1);
    if (fread(str, sizeof(char), (size_t)len, in) != (size_t)len) fail("Not enough data in stream to deserialize");
    str[len + 1] = '\0';
    *(const char **)out = str;
}

public
const char *CString$join(const char *glue, List_t strings) {
    Text_t ret = EMPTY_TEXT;
    Text_t glue_text = Text$from_str(glue);
    for (int64_t i = 0; i < (int64_t)strings.length; i++) {
        if (i > 0) ret = Texts(ret, glue_text);
        ret = Texts(ret, Text$from_str(*(const char **)(strings.data + i * strings.stride)));
    }
    return Text$as_c_string(ret);
}

public
const TypeInfo_t CString$info = {
    .size = sizeof(const char *),
    .align = __alignof__(const char *),
    .metamethods =
        {
            .hash = CString$hash,
            .compare = CString$compare,
            .equal = CString$equal,
            .as_text = CString$as_text,
            .is_none = CString$is_none,
            .serialize = CString$serialize,
            .deserialize = CString$deserialize,
        },
};