(module uahgi2 racket/base
    (require racket/dict)
    (require racket/list)
    (define main-config (make-hash
                         '(["paper-width". 2480]
                           ["paper-height". 3508]
                           ["lang" . #f]
                           ["font-family" . "FreeSerif"]
                           ["font-family-CJK" . "Noto Sans CJK TC"]
                           ["font-size" . 14]
                           ["font-weight" . "regular"]
                           ["font-style" . "normal"]
                           
                           )))
  (define main-frame (make-hash
                      `(["id" . 1]
                        ["font-family" . ,(dict-ref main-config "font-family")]
                        ["class" . "frame"]
                        ["width" . 2000]
                        ["height" . 3000]
                        ["x" . 200]
                        ["y" . 250]
                        ["content" . #f])))

    (define (set-main-config attr val)
      (dict-set! main-config attr val))

  (define-syntax text-series
    (syntax-rules ()
        [(_ x ...)
         ; delete the beginning newline
         (if (eq? (caar `(x ...)) "\n")
          `('text ,(cdar `(x ...)))
         `('text ,(caar `(x ...)) ,(cdar `(x ...))))]))

     
(define plugin-list '())

(define [two-newlines-into-par-aux cont]
  (display (list-ref cont 1))
  (define (sexp-processing res remain)
  [cond
    [(eq? remain '()) (reverse res)]
    [(and (equal? (car remain) "\n") (equal? (car res) "\n")) (sexp-processing (cons '(par) (cdr res)) [cdr remain])]
    [else (sexp-processing(cons (car remain) res) [cdr remain])]])
  (list-set cont 1 (sexp-processing '() (list-ref cont 1))))

(define two-newlines-into-par (make-hash `(["lang" . "all"] ; for all languages
                                 ["body" . ,two-newlines-into-par-aux])))

(define [is-cjk-matched? char]
  (define cjk-range #rx"[\u4E00-\u9FFF\u3400-\u4DBF\uF900-\uFAFF\U00020000-\U0002EBEF\u3000-\u303F,。!.?()—:;]")
  (regexp-match? cjk-range char)
  )

(define [remove-newline-between-cjk-aux cont]
  (display (list-ref cont 1))
  (define (sexp-processing res remain)
  [cond
    [(eq? remain '()) (reverse res)]
    [(and(equal? (car remain) "\n") (is-cjk-matched? (car res))  (= (length remain) 1) (sexp-processing(cons (car remain) res) [cdr remain]))]
    [(and(equal? (car remain) "\n") (is-cjk-matched? (car res))  (is-cjk-matched? (cadr remain)))
     (sexp-processing (cons (cadr remain) res) [cddr remain])]
    [else (sexp-processing(cons (car remain) res) [cdr remain])]])
  (list-set cont 1 (sexp-processing '() (list-ref cont 1))))

(define remove-newline-between-cjk (make-hash `(["lang" . "zh"]
                                 ["body" . ,remove-newline-between-cjk-aux])))


(define-syntax append-plugin!
  (syntax-rules ()
    [(_ ls plugin) (set! ls (reverse (cons plugin (reverse ls))))]))
  
[append-plugin! plugin-list two-newlines-into-par]
[append-plugin! plugin-list remove-newline-between-cjk]

  (define (main-text txt)
    (begin
      (dict-set! main-frame "content" txt)
      (display plugin-list)
      (for/list ([p plugin-list])
      [if [or (memq (dict-ref p "lang") (dict-ref main-config "lang"))
              (eq? (dict-ref p "lang") "all")]
          [let ([tmp ((dict-ref p "body") (dict-ref main-frame "content"))])
            (dict-set! main-frame "content" tmp)] #f])))


    (provide text-series main-text main-frame main-config set-main-config set!
             (all-from-out racket/base) (all-from-out racket/dict)
             #%module-begin #%app #%datum #%expression #%top)


   )