/* A few types are assumed to always exist. */
typedef size_t duk_size_t;
typedef ptrdiff_t duk_ptrdiff_t;

/* The best type for an "all around int" in Duktape internals is "at least
 * 32 bit signed integer" which is most convenient.  Same for unsigned type.
 * Prefer 'int' when large enough, as it is almost always a convenient type.
 */
#if defined(UINT_MAX) && (UINT_MAX >= 0xffffffffUL)
typedef int duk_int_t;
typedef unsigned int duk_uint_t;
#define DUK_INT_MIN           INT_MIN
#define DUK_INT_MAX           INT_MAX
#define DUK_UINT_MIN          0
#define DUK_UINT_MAX          UINT_MAX
#else
typedef duk_int_fast32_t duk_int_t;
typedef duk_uint_fast32_t duk_uint_t;
#define DUK_INT_MIN           DUK_INT_FAST32_MIN
#define DUK_INT_MAX           DUK_INT_FAST32_MAX
#define DUK_UINT_MIN          DUK_UINT_FAST32_MIN
#define DUK_UINT_MAX          DUK_UINT_FAST32_MAX
#endif

/* Same as 'duk_int_t' but guaranteed to be a 'fast' variant if this
 * distinction matters for the CPU.  These types are used mainly in the
 * executor where it might really matter.
 */
typedef duk_int_fast32_t duk_int_fast_t;
typedef duk_uint_fast32_t duk_uint_fast_t;
#define DUK_INT_FAST_MIN      DUK_INT_FAST32_MIN
#define DUK_INT_FAST_MAX      DUK_INT_FAST32_MAX
#define DUK_UINT_FAST_MIN     DUK_UINT_FAST32_MIN
#define DUK_UINT_FAST_MAX     DUK_UINT_FAST32_MAX

/* Small integers (16 bits or more) can fall back to the 'int' type, but
 * have a typedef so they are marked "small" explicitly.
 */
typedef int duk_small_int_t;
typedef unsigned int duk_small_uint_t;
#define DUK_SMALL_INT_MIN     INT_MIN
#define DUK_SMALL_INT_MAX     INT_MAX
#define DUK_SMALL_UINT_MIN    0
#define DUK_SMALL_UINT_MAX    UINT_MAX

/* Fast variants of small integers, again for really fast paths like the
 * executor.
 */
typedef duk_int_fast16_t duk_small_int_fast_t;
typedef duk_uint_fast16_t duk_small_uint_fast_t;
#define DUK_SMALL_INT_FAST_MIN    DUK_INT_FAST16_MIN
#define DUK_SMALL_INT_FAST_MAX    DUK_INT_FAST16_MAX
#define DUK_SMALL_UINT_FAST_MIN   DUK_UINT_FAST16_MIN
#define DUK_SMALL_UINT_FAST_MAX   DUK_UINT_FAST16_MAX

/* Boolean values are represented with the platform 'int'. */
typedef duk_small_int_t duk_bool_t;
#define DUK_BOOL_MIN              DUK_SMALL_INT_MIN
#define DUK_BOOL_MAX              DUK_SMALL_INT_MAX

/* Index values must have at least 32-bit signed range. */
typedef duk_int_t duk_idx_t;
#define DUK_IDX_MIN               DUK_INT_MIN
#define DUK_IDX_MAX               DUK_INT_MAX

/* Unsigned index variant. */
typedef duk_uint_t duk_uidx_t;
#define DUK_UIDX_MIN              DUK_UINT_MIN
#define DUK_UIDX_MAX              DUK_UINT_MAX

/* Array index values, could be exact 32 bits.
 * Currently no need for signed duk_arridx_t.
 */
typedef duk_uint_t duk_uarridx_t;
#define DUK_UARRIDX_MIN           DUK_UINT_MIN
#define DUK_UARRIDX_MAX           DUK_UINT_MAX

/* Duktape/C function return value, platform int is enough for now to
 * represent 0, 1, or negative error code.  Must be compatible with
 * assigning truth values (e.g. duk_ret_t rc = (foo == bar);).
 */
typedef duk_small_int_t duk_ret_t;
#define DUK_RET_MIN               DUK_SMALL_INT_MIN
#define DUK_RET_MAX               DUK_SMALL_INT_MAX

/* Error codes are represented with platform int.  High bits are used
 * for flags and such, so 32 bits are needed.
 */
typedef duk_int_t duk_errcode_t;
#define DUK_ERRCODE_MIN           DUK_INT_MIN
#define DUK_ERRCODE_MAX           DUK_INT_MAX

/* Codepoint type.  Must be 32 bits or more because it is used also for
 * internal codepoints.  The type is signed because negative codepoints
 * are used as internal markers (e.g. to mark EOF or missing argument).
 * (X)UTF-8/CESU-8 encode/decode take and return an unsigned variant to
 * ensure duk_uint32_t casts back and forth nicely.  Almost everything
 * else uses the signed one.
 */
typedef duk_int_t duk_codepoint_t;
typedef duk_uint_t duk_ucodepoint_t;
#define DUK_CODEPOINT_MIN         DUK_INT_MIN
#define DUK_CODEPOINT_MAX         DUK_INT_MAX
#define DUK_UCODEPOINT_MIN        DUK_UINT_MIN
#define DUK_UCODEPOINT_MAX        DUK_UINT_MAX

/* IEEE float/double typedef. */
typedef float duk_float_t;
typedef double duk_double_t;

/* We're generally assuming that we're working on a platform with a 32-bit
 * address space.  If DUK_SIZE_MAX is a typecast value (which is necessary
 * if SIZE_MAX is missing), the check must be avoided because the
 * preprocessor can't do a comparison.
 */
#if !defined(DUK_SIZE_MAX)
#error DUK_SIZE_MAX is undefined, probably missing SIZE_MAX
#elif !defined(DUK_SIZE_MAX_COMPUTED)
#if DUK_SIZE_MAX < 0xffffffffUL
/* On some systems SIZE_MAX can be smaller than max unsigned 32-bit value
 * which seems incorrect if size_t is (at least) an unsigned 32-bit type.
 * However, it doesn't seem useful to error out compilation if this is the
 * case.
 */
#endif
#endif

/* Type for public API calls. */
typedef struct duk_hthread duk_context;