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#ifndef EINA_USTRBUF_H
#define EINA_USTRBUF_H

#include <stddef.h>

#include "eina_types.h"
#include "eina_unicode.h"

/**
 * @addtogroup Eina_Unicode_String_Buffer_Group Unicode String Buffer
 *
 * @brief These functions provide unicode string buffers management.
 *
 * The Unicode String Buffer data type is designed to be a mutable string,
 * allowing to append, prepend or insert a string to a buffer.
 */

/**
 * @addtogroup Eina_Data_Types_Group Data Types
 *
 * @{
 */

/**
 * @defgroup Eina_Unicode_String_Buffer_Group Unicode String Buffer
 *
 * @{
 */

/**
 * @typedef Eina_UStrbuf
 * Type for a string buffer.
 */
typedef struct _Eina_Strbuf Eina_UStrbuf;

/**
 * @brief Creates a new string buffer.
 *
 * @return Newly allocated string buffer instance.
 *
 * This function creates a new string buffer. On error, @c NULL is
 * returned. To free the resources, use eina_ustrbuf_free().
 *
 * @see eina_ustrbuf_free()
 * @see eina_ustrbuf_append()
 * @see eina_ustrbuf_string_get()
 */
EAPI Eina_UStrbuf *eina_ustrbuf_new(void) EINA_MALLOC EINA_WARN_UNUSED_RESULT;

/**
 * @brief Creates a new string buffer using the passed string. The passed
 * string is used directly as the buffer, it's somehow the opposite function of
 * @ref eina_ustrbuf_string_steal . The passed string must be malloc'd.
 *
 * @param str The string to manage
 * @return Newly allocated string buffer instance
 *
 * This function creates a new string buffer. On error, @c NULL is
 * returned. To free the resources, use eina_strbuf_free().
 *
 * @see eina_ustrbuf_free()
 * @see eina_ustrbuf_append()
 * @see eina_ustrbuf_string_get()
 * @since 1.1.0
 */
EAPI Eina_UStrbuf *eina_ustrbuf_manage_new(Eina_Unicode *str) EINA_MALLOC EINA_WARN_UNUSED_RESULT;

/**
 * @brief Creates a new string buffer using the passed string. The passed
 * string is used directly as the buffer, it's somehow the opposite function of
 * @ref eina_ustrbuf_string_steal . The passed string must be malloc'd.
 *
 * @param str The string to manage
 * @param length The length of the string.
 * @return Newly allocated string buffer instance.
 *
 * This function creates a new string buffer. On error, @c NULL is
 * returned. To free the resources, use eina_ustrbuf_free().
 *
 * @see eina_ustrbuf_manage_new()
 * @since 1.2.0
 */
EAPI Eina_UStrbuf *eina_ustrbuf_manage_new_length(Eina_Unicode *str, size_t length) EINA_MALLOC EINA_WARN_UNUSED_RESULT;

/**
 * @brief Frees a string buffer.
 *
 * @param buf The string buffer to free.
 *
 * This function frees the memory of @p buf. @p buf must have been
 * created by eina_ustrbuf_new().
 */
EAPI void eina_ustrbuf_free(Eina_UStrbuf *buf) EINA_ARG_NONNULL(1);

/**
 * @brief Resets a string buffer.
 *
 * @param buf The string buffer to reset.
 *
 * This function reset @p buf: the buffer len is set to 0, and the
 * string is set to '\\0'. No memory is free'd.
 */
EAPI void eina_ustrbuf_reset(Eina_UStrbuf *buf) EINA_ARG_NONNULL(1);

/**
 * @brief Appends a string to a buffer, reallocating as necessary.
 *
 * @param buf The string buffer to append to.
 * @param str The string to append.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function appends @p str to @p buf. It computes the length of
 * @p str, so is slightly slower than eina_ustrbuf_append_length(). If
 * the length is known beforehand, consider using that variant. If
 * @p buf can't append it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 *
 * @see eina_ustrbuf_append()
 * @see eina_ustrbuf_append_length()
 */
EAPI Eina_Bool eina_ustrbuf_append(Eina_UStrbuf *buf, const Eina_Unicode *str) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Appends an escaped string to a buffer, reallocating as necessary.
 *
 * @param buf The string buffer to append to.
 * @param str The string to append.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function appends the escaped string @p str to @p buf. If @p
 * str can not be appended, #EINA_FALSE is returned, otherwise, #EINA_TRUE is
 * returned.
 */
EAPI Eina_Bool eina_ustrbuf_append_escaped(Eina_UStrbuf *buf, const Eina_Unicode *str) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Appends a string to a buffer, reallocating as necessary,
 * limited by the given length.
 *
 * @param buf The string buffer to append to.
 * @param str The string to append.
 * @param maxlen The maximum number of characters to append.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function appends at most @p maxlen characters of @p str to
 * @p buf. It can't append more than the length of @p str. It
 * computes the length of @p str, so is slightly slower than
 * eina_ustrbuf_append_length(). If the length is known beforehand,
 * consider using that variant (@p maxlen should then be checked so
 * that it is greater than the size of @p str). If @p str can not be
 * appended, #EINA_FALSE is returned, otherwise, #EINA_TRUE is
 * returned.
 *
 * @see eina_ustrbuf_append()
 * @see eina_ustrbuf_append_length()
 */
EAPI Eina_Bool eina_ustrbuf_append_n(Eina_UStrbuf *buf, const Eina_Unicode *str, size_t maxlen) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Appends a string of exact length to a buffer, reallocating as necessary.
 *
 * @param buf The string buffer to append to.
 * @param str The string to append.
 * @param length The exact length to use.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function appends @p str to @p buf. @p str must be of size at
 * most @p length. It is slightly faster than eina_ustrbuf_append() as
 * it does not compute the size of @p str. It is useful when dealing
 * with strings of known size, such as eina_strngshare. If @p buf
 * can't append it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 *
 * @see eina_stringshare_length()
 * @see eina_ustrbuf_append()
 * @see eina_ustrbuf_append_n()
 */
EAPI Eina_Bool eina_ustrbuf_append_length(Eina_UStrbuf *buf, const Eina_Unicode *str, size_t length) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Appends a slice to a buffer, reallocating as necessary.
 *
 * @param buf The string buffer to append to.
 * @param slice The slice to append.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function appends @p slice to @p buf. If @p buf can't append
 * it, #EINA_FALSE is returned, otherwise #EINA_TRUE is returned.
 *
 * @since 1.19.0
 */
EAPI Eina_Bool eina_ustrbuf_append_slice(Eina_UStrbuf *buf, const Eina_Slice slice) EINA_ARG_NONNULL(1);

/**
 * @brief Appends a character to a string buffer, reallocating as
 * necessary.
 *
 * @param buf The string buffer to append to.
 * @param c The char to append.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function inserts @p c to @p buf. If it can not insert it, #EINA_FALSE
 * is returned, otherwise #EINA_TRUE is returned.
 */
EAPI Eina_Bool eina_ustrbuf_append_char(Eina_UStrbuf *buf, Eina_Unicode c) EINA_ARG_NONNULL(1);

/**
 * @brief Inserts a string to a buffer, reallocating as necessary.
 *
 * @param buf The string buffer to insert.
 * @param str The string to insert.
 * @param pos The position to insert the string.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function inserts @p str to @p buf at position @p pos. It
 * computes the length of @p str, so is slightly slower than
 * eina_ustrbuf_insert_length(). If  the length is known beforehand,
 * consider using that variant. If @p buf can't insert it, #EINA_FALSE
 * is returned, otherwise #EINA_TRUE is returned.
 */
EAPI Eina_Bool eina_ustrbuf_insert(Eina_UStrbuf *buf, const Eina_Unicode *str, size_t pos) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Inserts an escaped string to a buffer, reallocating as
 * necessary.
 *
 * @param buf The string buffer to insert to.
 * @param str The string to insert.
 * @param pos The position to insert the string.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function inserts the escaped string @p str to @p buf at
 * position @p pos. If @p buf can't insert @p str, #EINA_FALSE is
 * returned, otherwise #EINA_TRUE is returned.
 */
EAPI Eina_Bool eina_ustrbuf_insert_escaped(Eina_UStrbuf *buf, const Eina_Unicode *str, size_t pos) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Inserts a string to a buffer, reallocating as necessary. Limited by maxlen.
 *
 * @param buf The string buffer to insert to.
 * @param str The string to insert.
 * @param maxlen The maximum number of chars to insert.
 * @param pos The position to insert the string.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function inserts @p str ot @p buf at position @p pos, with at
 * most @p maxlen bytes. The number of inserted characters can not be
 * greater than the length of @p str. It computes the length of
 * @p str, so is slightly slower than eina_ustrbuf_insert_length(). If the
 * length is known beforehand, consider using that variant (@p maxlen
 * should then be checked so that it is greater than the size of
 * @p str). If @p str can not be inserted, #EINA_FALSE is returned,
 * otherwise, #EINA_TRUE is returned.
 */
EAPI Eina_Bool eina_ustrbuf_insert_n(Eina_UStrbuf *buf, const Eina_Unicode *str, size_t maxlen, size_t pos) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Inserts a string of exact length to a buffer, reallocating as necessary.
 *
 * @param buf The string buffer to insert to.
 * @param str The string to insert.
 * @param length The exact length to use.
 * @param pos The position to insert the string.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function inserts @p str to @p buf. @p str must be of size at
 * most @p length. It is slightly faster than eina_ustrbuf_insert() as
 * it does not compute the size of @p str. It is useful when dealing
 * with strings of known size, such as eina_strngshare. If @p buf
 * can't insert it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 *
 * @see eina_stringshare_length()
 * @see eina_ustrbuf_insert()
 * @see eina_ustrbuf_insert_n()
 */
EAPI Eina_Bool eina_ustrbuf_insert_length(Eina_UStrbuf *buf, const Eina_Unicode *str, size_t length, size_t pos) EINA_ARG_NONNULL(1, 2);

/**
 * @brief Inserts a slice to a buffer, reallocating as necessary.
 *
 * @param buf The string buffer to insert to.
 * @param slice The slice to insert.
 * @param pos The position to insert the string.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function inserts @p slice to @p buf at position @p pos. If @p
 * buf can't insert it, #EINA_FALSE is returned, otherwise #EINA_TRUE
 * is returned.
 *
 * @since 1.19.0
 */
EAPI Eina_Bool eina_ustrbuf_insert_slice(Eina_UStrbuf *buf, const Eina_Slice slice, size_t pos) EINA_ARG_NONNULL(1);

/**
 * @brief Inserts a character to a string buffer, reallocating as
 * necessary.
 *
 * @param buf The string buffer to insert to.
 * @param c The char to insert.
 * @param pos The position to insert the char.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function inserts @p c to @p buf at position @p pos. If @p buf
 * can't append it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 */
EAPI Eina_Bool eina_ustrbuf_insert_char(Eina_UStrbuf *buf, Eina_Unicode c, size_t pos) EINA_ARG_NONNULL(1);

/**
 * @def eina_ustrbuf_prepend(buf, str)
 * @brief Prepends the given string to the given buffer.
 *
 * @param buf The string buffer to prepend to.
 * @param str The string to prepend.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This macro is calling eina_ustrbuf_insert() at position 0. If @p buf
 * can't prepend it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 */
#define eina_ustrbuf_prepend(buf, str)                eina_ustrbuf_insert(buf, str, 0)

/**
 * @def eina_ustrbuf_prepend_escaped(buf, str)
 * @brief Prepends the given escaped string to the given buffer.
 *
 * @param buf The string buffer to prepend to.
 * @param str The string to prepend.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This macro is calling eina_ustrbuf_insert_escaped() at position 0. If
 * @p buf can't prepend it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 */
#define eina_ustrbuf_prepend_escaped(buf, str)        eina_ustrbuf_insert_escaped(buf, str, 0)

/**
 * @def eina_ustrbuf_prepend_n(buf, str)
 * @brief Prepends the given escaped string to the given buffer.
 *
 * @param buf The string buffer to prepend to.
 * @param str The string to prepend.
 * @param maxlen The maximum number of Eina_Unicode *s to prepend.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This macro is calling eina_ustrbuf_insert_n() at position 0. If
 * @p buf can't prepend it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 */
#define eina_ustrbuf_prepend_n(buf, str, maxlen)      eina_ustrbuf_insert_n(buf, str, maxlen, 0)

/**
 * @def eina_ustrbuf_prepend_length(buf, str)
 * @brief Prepends the given escaped string to the given buffer.
 *
 * @param buf The string buffer to prepend to.
 * @param str The string to prepend.
 * @param length The exact length to use.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This macro is calling eina_ustrbuf_insert_length() at position 0. If
 * @p buf can't prepend it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 */
#define eina_ustrbuf_prepend_length(buf, str, length) eina_ustrbuf_insert_length(buf, str, length, 0)

/**
 * @def eina_ustrbuf_prepend_char(buf, c)
 * @brief Prepends the given unicode character to the given buffer.
 *
 * @param buf The string buffer to prepend to.
 * @param c The Eina_Unicode character to prepend.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This macro is calling eina_ustrbuf_insert_Eina_Unicode *() at position 0. If
 * @p buf can't prepend it, #EINA_FALSE is returned, otherwise #EINA_TRUE is
 * returned.
 */
#define eina_ustrbuf_prepend_char(buf, c) eina_ustrbuf_insert_char(buf, c, 0)

/**
 * @brief Removes a slice of the given string buffer.
 *
 * @param buf The string buffer to remove a slice.
 * @param start The initial (inclusive) slice position to start
 *        removing, in bytes.
 * @param end The final (non-inclusive) slice position to finish
 *        removing, in bytes.
 * @return #EINA_TRUE on success, #EINA_FALSE on failure.
 *
 * This function removes a slice of @p buf, starting at @p start
 * (inclusive) and ending at @p end (non-inclusive). Both values are
 * in bytes. It returns #EINA_FALSE on failure, #EINA_TRUE otherwise.
 */
EAPI Eina_Bool
eina_ustrbuf_remove(Eina_UStrbuf *buf, size_t start, size_t end) EINA_ARG_NONNULL(1);

/**
 * @brief Retrieves a pointer to the contents of a string buffer.
 *
 * @param buf The string buffer.
 * @return The current string in the string buffer.
 *
 * This function returns the string contained in @p buf. The returned
 * value must not be modified and will no longer be valid if @p buf is
 * modified. In other words, any eina_ustrbuf_append() or similar will
 * make that pointer invalid.
 *
 * @see eina_ustrbuf_string_steal()
 */
EAPI const Eina_Unicode *
eina_ustrbuf_string_get(const Eina_UStrbuf *buf) EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;

/**
 * @brief Steals the contents of a string buffer.
 *
 * @param buf The string buffer to steal.
 * @return The current string in the string buffer.
 *
 * This function returns the string contained in @p buf. @p buf is
 * then initialized and does not own the returned string anymore. The
 * caller must release the memory of the returned string by calling
 * free().
 *
 * @see eina_ustrbuf_string_get()
 */
EAPI Eina_Unicode *
eina_ustrbuf_string_steal(Eina_UStrbuf *buf) EINA_MALLOC EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);

/**
 * @brief Frees the contents of a string buffer but not the buffer.
 *
 * @param buf The string buffer to free the string of.
 *
 * This function frees the string contained in @p buf without freeing
 * @p buf.
 */
EAPI void
eina_ustrbuf_string_free(Eina_UStrbuf *buf) EINA_ARG_NONNULL(1);

/**
 * @brief Retrieves the length of the string buffer content.
 *
 * @param buf The string buffer.
 * @return The current length of the string, in bytes.
 *
 * This function returns the length of @p buf.
 */
EAPI size_t
eina_ustrbuf_length_get(const Eina_UStrbuf *buf) EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;

/**
 * @brief Gets a read-only slice representing the current ustrbuf contents.
 *
 * @param buf The source string.
 * @return A read-only slice for the current contents. It may become
 *         invalid as soon as the @a buf is changed.
 *
 * @since 1.19
 */
EAPI Eina_Slice eina_ustrbuf_slice_get(const Eina_UStrbuf *buf) EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);

/**
 * @brief Gets a read-write slice representing the current ustrbuf contents.
 *
 * @param buf The source string.
 * @return A read-write slice for the current contents. It may become
 *         invalid as soon as the @a buf is changed with calls such as
 *         eina_ustrbuf_append(), eina_ustrbuf_remove()
 *
 * @since 1.19.0
 */
EAPI Eina_Rw_Slice eina_ustrbuf_rw_slice_get(const Eina_UStrbuf *buf) EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);

/**
 * @brief Gets the string of the buffer and free the buffer
 *
 * @param buf The buffer to get the string from and which will be freed
 *
 * @return The string contained by buf. The caller must release the memory of the returned string by calling
 * free().
 *
 * @since 1.19
 */
EAPI Eina_Unicode* eina_ustrbuf_release(Eina_UStrbuf *buf) EINA_WARN_UNUSED_RESULT EINA_ARG_NONNULL(1);

/**
 * @}
 */

/**
 * @}
 */

#endif /* EINA_STRBUF_H */