#ifndef STRING_H
#define STRING_H

struct string_array {
    u64 count;
    struct string *strings;
};

/* ========================== *
 * Conversion
 * ========================== */

struct string string_from_char(struct arena *arena, char c);
struct string string_from_uint(struct arena *arena, u64 n, u32 base);
struct string string_from_int(struct arena *arena, i64 n, u32 base);
struct string string_from_ptr(struct arena *arena, void *ptr);
struct string string_from_float(struct arena *arena, f64 f, u32 precision);

/* ========================== *
 * String operations
 * ========================== */

struct string string_copy(struct arena *arena, struct string src);
struct string string_copy_to_string(struct string dst, struct string src);
struct string string_repeat(struct arena *arena, struct string src, u64 count);
struct string string_cat(struct arena *arena, struct string str1, struct string str2);
struct string_array string_split(struct arena *arena, struct string str, struct string delim);
struct string string_indent(struct arena *arena, struct string str, u32 indent);
struct string string_lower(struct arena *arena, struct string str);
b32 string_eq(struct string str1, struct string str2);
i32 string_cmp(struct string str1, struct string str2);
b32 string_contains(struct string str, struct string substring);
b32 string_starts_with(struct string str, struct string substring);
b32 string_ends_with(struct string str, struct string substring);

/* ========================== *
 * Format
 * ========================== */

#define DEFAULT_FMT_PRECISION 6

enum fmt_type {
    FMT_TYPE_NONE,

    /* Arbitrary magic numbers to avoid accidental non-fmt arguments */
    FMT_TYPE_CHAR  = 0xC6ECD1,
    FMT_TYPE_STR   = 0xC6ECD2,
    FMT_TYPE_UINT  = 0xC6ECD3,
    FMT_TYPE_SINT  = 0xC6ECD4,
    FMT_TYPE_HEX   = 0xC6ECD5,
    FMT_TYPE_PTR   = 0xC6ECD6,
    FMT_TYPE_FLOAT = 0xC6ECD7,

    FMT_TYPE_END   = 0xAD32F3
};

struct fmt_arg {
    enum fmt_type type;
    union {
        u8 c;
        struct string string;
        u64 uint;
        i64 sint;
        void *ptr;
        struct {
            f64 val;
            u32 precision;
        } f;
    } value;
};

#define FMT_END (struct fmt_arg) {.type = FMT_TYPE_END}

#define FMT_CHAR(v) (struct fmt_arg) {.type = FMT_TYPE_CHAR, .value.c = (v)}
#define FMT_STR(v) (struct fmt_arg) {.type = FMT_TYPE_STR, .value.string = (v)}
#define FMT_UINT(v) (struct fmt_arg) {.type = FMT_TYPE_UINT, .value.uint = (v)}
#define FMT_SINT(v) (struct fmt_arg) {.type = FMT_TYPE_SINT, .value.sint = (v)}
#define FMT_HEX(v) (struct fmt_arg) {.type = FMT_TYPE_HEX, .value.uint = (v)}
#define FMT_PTR(v) (struct fmt_arg) {.type = FMT_TYPE_PTR, .value.ptr = (v)}
#define FMT_FLOAT(v) FMT_FLOAT_P(v, DEFAULT_FMT_PRECISION)
#define FMT_FLOAT_P(v, p) (struct fmt_arg) {.type = FMT_TYPE_FLOAT, .value.f.val = (v), .value.f.precision = p}

#define string_format(arena, fmt, ...) _string_format((arena), (fmt), __VA_ARGS__, FMT_END)
struct string _string_format(struct arena *arena, struct string fmt, ...);
struct string string_formatv(struct arena *arena, struct string fmt, va_list args);

/* ========================== *
 * Unicode
 * ========================== */

struct string_codepoint_iter {
    u32 codepoint;

    /* Internal */
    struct string src;
    u64 pos;
};

struct string_codepoint_iter string_codepoint_iter_begin(struct string str);
b32 string_codepoint_iter_next(struct string_codepoint_iter *iter);
void string_codepoint_iter_end(struct string_codepoint_iter *iter);

struct string string_from_string16(struct arena *arena, struct string16 str16);
struct string string_from_string32(struct arena *arena, struct string32 str32);

struct string16 string16_from_string(struct arena *arena, struct string str8);
struct string32 string32_from_string(struct arena *arena, struct string str8);

/* ========================== *
 * Legacy strings
 * ========================== */

u64 cstr_len(char *cstr);
u64 cstr_len_limit(char *cstr, u64 limit);
char *cstr_from_string(struct arena *arena, struct string src);
char *cstr_buff_from_string(struct string dest_buff, struct string src);
struct string string_from_cstr(char *cstr);
struct string string_from_cstr_limit(char *cstr, u64 limit);

u64 wstr_len(wchar_t *wstr);
wchar_t *wstr_from_string(struct arena *arena, struct string src);
wchar_t *wstr_from_string16(struct arena *arena, struct string16 src);
struct string string_from_wstr(struct arena *arena, wchar_t *wstr);
struct string16 string16_from_wstr(wchar_t *wstr);

#endif