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(module icu (char-from-name
             char-string-name
             char-digit-value
             char-decomposition
             char-numeric-value
             char-category
             char-direction
             char-combining-class
             char-mirror
             char-bidi-paired-bracket
             char->lower
             char->upper
             char->title
             ;; char-fold-case
             char-digit
             char-for-digit
             string-normalize
             char-mirrored?
             char-ualphabetic?
             char-ulowercase?
             char-uuppercase?
             char-uwhitespace?
             char-whitespace?
             char-java-space?
             char-space?
             char-blank?
             char-lower?
             char-upper?
             char-digit?
             char-alpha?
             char-alnum?
             char-xdigit?
             char-punct?
             char-graph?
             char-defined?
             char-cntrl?
             char-iso-control?
             char-print?
             char-base?)
  (import (except scheme
                  char-alphabetic?
                  char-whitespace?)
          (only chicken.module reexport)
          (only chicken.base when error)
          chicken.foreign
          (only srfi-13 string-null? string-upcase)
          (only srfi-1 take list-index)
          srfi-4
          (only foreigners define-foreign-enum-type))

  (reexport utf8)
  (foreign-declare "#include <unicode/uchar.h>")
  (foreign-declare "#include <unicode/unorm2.h>")

  (define (char-from-name name)
    (let ((char ((foreign-lambda* char (((const c-string) name))
                   "UErrorCode status = U_ZERO_ERROR;"
                   "UCharNameChoice choice = U_UNICODE_CHAR_NAME;"
                   "UChar32 res = u_charFromName(choice, name, &status);"
                   "if(U_SUCCESS(status)) {"
                   "    C_return(res);"
                   "} else {"
                   "    C_return(0);"
                   "}")
                 (string-upcase name))))
      (if (char=? #\null char) #f char)))

  (define (char-string-name char)
    (let ((name ((foreign-lambda* c-string ((int32 code))
                   "char dbuffer[150];"
                   "UErrorCode status = U_ZERO_ERROR;"
                   "UCharNameChoice choice = U_UNICODE_CHAR_NAME;"
                   "int32_t len = u_charName(code, choice, dbuffer, 150, &status);"
                   ;; "if(len == 0) {"
                   ;; "    status = U_ZERO_ERROR;"
                   ;; "    choice = U_CHAR_NAME_ALIAS;"
                   ;; "    len = u_charName(code, choice, dbuffer, 1, &status);"
                   ;; ;; "printf(\"%d\\n\", len);"
                   ;; "}"
                   ;; "char* buffer = malloc(sizeof(char) * len);"
                   ;; "status = U_ZERO_ERROR;"
                   ;; "len = u_charName(code, choice, buffer, len, &status);"
                   "C_return(dbuffer);")
                 (char->integer char))))
      (if (string-null? name) #f name)))

  (define (char-digit-value char)
    (let ((decimal ((foreign-lambda* int32 ((int32 code))
                      "C_return(u_charDigitValue(code));")
                    (char->integer char))))
      (if (= decimal -1) #f decimal)))

  ;; (define digit decimal)

  (define (char-decomposition char)
    (let* ((res (make-u16vector 16 0))
           (len ((foreign-lambda* int32 ((int32 code) (u16vector dbuffer))
                   "UErrorCode status = U_ZERO_ERROR;"
                   "UNormalizer2 const *norm2 = unorm2_getInstance(NULL, \"nfkc\", UNORM2_COMPOSE, &status);"
                   "int32_t len = unorm2_getDecomposition(norm2, code, dbuffer, 16, &status);"
                   "C_return(len);")
                 (char->integer char)
                 res)))
      (if (negative? len)
          #f
          (let ((lst (u16vector->list res)))
            (map integer->char (take lst (list-index zero? lst)))))))

  (define (char-numeric-value char)
    (let ((decimal ((foreign-lambda* double ((int32 code))
                      "C_return(u_getNumericValue(code));")
                    (char->integer char))))
      (if (= decimal (foreign-value U_NO_NUMERIC_VALUE double))
          #f
          decimal)))


  (define-foreign-enum-type (category int)
    (category->int int->category)
    ((unassigned category/unassigned) U_UNASSIGNED)
    ((uppercase-letter category/uppercase-letter) U_UPPERCASE_LETTER)
    ((lowercase-letter category/lowercase-letter) U_LOWERCASE_LETTER)
    ((titlecase-letter category/titlecase-letter) U_TITLECASE_LETTER)
    ((modifier-letter category/modifier-letter) U_MODIFIER_LETTER)
    ((other-letter category/other-letter) U_OTHER_LETTER)
    ((non-spacing-mark category/non-spacing-mark) U_NON_SPACING_MARK)
    ((enclosing-mark category/enclosing-mark) U_ENCLOSING_MARK)
    ((combining-spacing-mark category/combining-spacing-mark) U_COMBINING_SPACING_MARK)
    ((decimal-digit-number category/decimal-digit-number) U_DECIMAL_DIGIT_NUMBER)
    ((letter-number category/letter-number) U_LETTER_NUMBER)
    ((other-number category/other-number) U_OTHER_NUMBER)
    ((space-separator category/space-separator) U_SPACE_SEPARATOR)
    ((line-separator category/line-separator) U_LINE_SEPARATOR)
    ((paragraph-separator category/paragraph-separator) U_PARAGRAPH_SEPARATOR)
    ((control-char category/control-char) U_CONTROL_CHAR)
    ((format-char category/format-char) U_FORMAT_CHAR)
    ((private-use-char category/private-use-char) U_PRIVATE_USE_CHAR)
    ((surrogate category/surrogate) U_SURROGATE)
    ((dash-punctuation category/dash-punctuation) U_DASH_PUNCTUATION)
    ((start-punctuation category/start-punctuation) U_START_PUNCTUATION)
    ((end-punctuation category/end-punctuation) U_END_PUNCTUATION)
    ((connector-punctuation category/connector-punctuation) U_CONNECTOR_PUNCTUATION)
    ((other-punctuation category/other-punctuation) U_OTHER_PUNCTUATION)
    ((math-symbol category/math-symbol) U_MATH_SYMBOL)
    ((currency-symbol category/currency-symbol) U_CURRENCY_SYMBOL)
    ((modifier-symbol category/modifier-symbol) U_MODIFIER_SYMBOL)
    ((other-symbol category/other-symbol) U_OTHER_SYMBOL)
    ((initial-punctuation category/initial-punctuation) U_INITIAL_PUNCTUATION)
    ((final-punctuation category/final-punctuation) U_FINAL_PUNCTUATION)
    ((char-category-count category/char-category-count) U_CHAR_CATEGORY_COUNT))

  (define (char-category char)
    (let ((result ((foreign-lambda* int ((int32 code))
                     "C_return(u_charType(code));")
                   (char->integer char))))
      (int->category result)))

  (define-foreign-enum-type (direction int)
    (direction->int int->direction)
    ((left-to-right              direction/left-to-right             ) U_LEFT_TO_RIGHT)
    ((right-to-left              direction/right-to-left             ) U_RIGHT_TO_LEFT)
    ((european-number            direction/european-number           ) U_EUROPEAN_NUMBER)
    ((european-number-separator  direction/european-number-separator ) U_EUROPEAN_NUMBER_SEPARATOR)
    ((european-number-terminator direction/european-number-terminator) U_EUROPEAN_NUMBER_TERMINATOR)
    ((arabic-number              direction/arabic-number             ) U_ARABIC_NUMBER)
    ((common-number-separator    direction/common-number-separator   ) U_COMMON_NUMBER_SEPARATOR)
    ((block-separator            direction/block-separator           ) U_BLOCK_SEPARATOR)
    ((segment-separator          direction/segment-separator         ) U_SEGMENT_SEPARATOR)
    ((white-space-neutral        direction/white-space-neutral       ) U_WHITE_SPACE_NEUTRAL)
    ((other-neutral              direction/other-neutral             ) U_OTHER_NEUTRAL)
    ((left-to-right-embedding    direction/left-to-right-embedding   ) U_LEFT_TO_RIGHT_EMBEDDING)
    ((left-to-right-override     direction/left-to-right-override    ) U_LEFT_TO_RIGHT_OVERRIDE)
    ((right-to-left-arabic       direction/right-to-left-arabic      ) U_RIGHT_TO_LEFT_ARABIC)
    ((right-to-left-embedding    direction/right-to-left-embedding   ) U_RIGHT_TO_LEFT_EMBEDDING)
    ((right-to-left-override     direction/right-to-left-override    ) U_RIGHT_TO_LEFT_OVERRIDE)
    ((pop-directional-format     direction/pop-directional-format    ) U_POP_DIRECTIONAL_FORMAT)
    ((dir-non-spacing-mark       direction/dir-non-spacing-mark      ) U_DIR_NON_SPACING_MARK)
    ((boundary-neutral           direction/boundary-neutral          ) U_BOUNDARY_NEUTRAL)
    ((first-strong-isolate       direction/first-strong-isolate      ) U_FIRST_STRONG_ISOLATE)
    ((left-to-right-isolate      direction/left-to-right-isolate     ) U_LEFT_TO_RIGHT_ISOLATE)
    ((right-to-left-isolate      direction/right-to-left-isolate     ) U_RIGHT_TO_LEFT_ISOLATE)
    ((pop-directional-isolate    direction/pop-directional-isolate   ) U_POP_DIRECTIONAL_ISOLATE)
    ((char-direction-count       direction/char-direction-count      ) U_CHAR_DIRECTION_COUNT))

  (define (char-direction char)
    (let ((result ((foreign-lambda* int ((int32 code))
                     "C_return(u_charDirection(code));")
                   (char->integer char))))
      (int->direction result)))

  (define (char-combining-class char)
    ((foreign-lambda* unsigned-byte ((int32 code))
       "C_return(u_getCombiningClass(code));")
     (char->integer char)))

  (define (char-mirror char)
    ((foreign-lambda* char ((int32 code))
       "C_return(u_charMirror(code));")
     (char->integer char)))

  (define (char-bidi-paired-bracket char)
    ((foreign-lambda* char ((int32 code))
       "C_return(u_getBidiPairedBracket(code));")
     (char->integer char)))

  (define (char->lower char)
    ((foreign-lambda* char ((int32 code))
       "C_return(u_tolower(code));")
     (char->integer char)))

  (define (char->upper char)
    ((foreign-lambda* char ((int32 code))
       "C_return(u_toupper(code));")
     (char->integer char)))

  (define (char->title char)
    ((foreign-lambda* char ((int32 code))
       "C_return(u_totitle(code));")
     (char->integer char)))

  ;; (define (char-fold-case char)
  ;;   ((foreign-lambda* char ((int32 code))
  ;;      "C_return(u_foldCase(code));")
  ;;    (char->integer char)))

  (define (char-digit char radix)
    ((foreign-lambda* int32 ((int32 code) (byte radix))
       "C_return(u_digit(code, radix));")
     (char->integer char)
     radix))

  (define char-for-digit
    (foreign-lambda* char ((int32 digit) (byte radix))
      "C_return(u_forDigit(digit, radix));"))

  (define (string-normalize input #!optional (form "nfkc"))
    (when (not (member form '("nfkc" "nfc" "nfkd" "nfd")))
      (error 'normalize "no such normalization form" form))
    (let* ((input-len (string-length input))
           (input (list->u16vector (map char->integer (string->list input))))
           (mode (if (or (string=? form "nfc")
                         (string=? form "nfkc"))
                     (foreign-value UNORM2_COMPOSE int)
                     (foreign-value UNORM2_DECOMPOSE int)))
           (form (cond ((string=? form "nfd") "nfc")
                       ((string=? form "nfkd") "nfkc")
                       (else form)))
           (output-len ((foreign-lambda* int32 ((c-string form) (u16vector input) (int32 input_len) (int mode))
                          "UErrorCode status = U_ZERO_ERROR;"
                          "UNormalizer2 const *norm2 = unorm2_getInstance(NULL, form, mode, &status);"
                          "UChar dest[1];"
                          "int32_t output_len = unorm2_normalize(norm2, input, input_len, dest, 1, &status);"
                          "C_return(output_len);")
                        form input input-len mode))
           (output (make-u16vector output-len 0)))
      ((foreign-lambda* void ((c-string form) (u16vector input) (int32 input_len) (u16vector output) (int32 output_len) (int mode) )
         "UErrorCode status = U_ZERO_ERROR;"
         "UNormalizer2 const *norm2 = unorm2_getInstance(NULL, form, mode, &status);"
         "int32_t len = unorm2_normalize(norm2, input, input_len, output, output_len, &status);")
       form input input-len output output-len mode)
      (list->string (map integer->char (u16vector->list output)))))

  (define (char-mirrored? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isMirrored(code));")
     (char->integer char)))

  (define (char-ualphabetic? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isUAlphabetic(code));")
     (char->integer char)))

  (define (char-ulowercase? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isULowercase(code));")
     (char->integer char)))

  (define (char-uuppercase? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isUUppercase(code));")
     (char->integer char)))

  ;; Whitespace
  (define (char-uwhitespace? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isUWhiteSpace(code));")
     (char->integer char)))

  (define (char-whitespace? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isWhitespace(code));")
     (char->integer char)))

  (define (char-java-space? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isJavaSpaceChar(code));")
     (char->integer char)))

  (define (char-space? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isspace(code));")
     (char->integer char)))

  (define (char-blank? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isblank(code));")
     (char->integer char)))

  (define (char-lower? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_islower(code));")
     (char->integer char)))

  (define (char-upper? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isupper(code));")
     (char->integer char)))

  (define (char-digit? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isdigit(code));")
     (char->integer char)))

  (define (char-alpha? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isalpha(code));")
     (char->integer char)))

  (define (char-alnum? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isalnum(code));")
     (char->integer char)))

  (define (char-xdigit? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isxdigit(code));")
     (char->integer char)))

  (define (char-punct? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_ispunct(code));")
     (char->integer char)))

  (define (char-graph? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isgraph(code));")
     (char->integer char)))

  (define (char-defined? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isdefined(code));")
     (char->integer char)))

  (define (char-cntrl? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_iscntrl(code));")
     (char->integer char)))

  (define (char-iso-control? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isISOControl(code));")
     (char->integer char)))

  (define (char-print? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isprint(code));")
     (char->integer char)))

  (define (char-base? char)
    ((foreign-lambda* bool ((int32 code))
       "C_return(u_isbase(code));")
     (char->integer char)))



  ;; (define (string-normalized? form input)
  ;;   )
  ;; (print  (char-alphabetic? #\x)
  ;;  )

  )