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(define-module (vcomponent formats xcal output)
:use-module (hnh util)
:use-module (hnh util exceptions)
:use-module (vcomponent)
:use-module (vcomponent geo)
:use-module (vcomponent formats xcal types)
:use-module (ice-9 match)
:use-module (datetime)
:use-module (srfi srfi-1)
:use-module (calp translation)
:export (vcomponent->sxcal ns-wrap))
(define (vline->value-tag vline)
(define key (vline-key vline))
(define writer
(cond
[(and=> (param vline 'VALUE) (compose string->symbol car))
=> get-writer]
[(memv key '(COMPLETED DTEND DUE DTSTART RECURRENCE-ID
CREATED DTSTAMP LAST-MODIFIED
ACKNOWLEDGED EXDATE))
(get-writer 'DATE-TIME)]
[(memv key '(TRIGGER DURATION))
(get-writer 'DURATION)]
[(memv key '(FREEBUSY))
(get-writer 'PERIOD)]
[(memv key '(CALSCALE METHOD PRODID COMMENT DESCRIPTION
LOCATION SUMMARY TZID TZNAME
CONTACT RELATED-TO UID
CATEGORIES RESOURCES
VERSION))
(get-writer 'TEXT)]
[(memv key '(TRANSP
CLASS
PARTSTAT
STATUS
ACTION))
(lambda (p v) ((get-writer 'TEXT) p (symbol->string v)))]
[(memv key '(TZOFFSETFROM TZOFFSETTO))
(get-writer 'UTC-OFFSET)]
[(memv key '(ATTACH TZURL URL))
(get-writer 'URI)]
[(memv key '(PERCENT-COMPLETE PRIORITY REPEAT SEQUENCE))
(get-writer 'INTEGER)]
[(memv key '(GEO))
(lambda (_ v)
`(geo
(latitude ,(geo-latitude v))
(longitude ,(geo-longitude v))))]
[(memv key '(RRULE))
(get-writer 'RECUR)]
[(memv key '(ORGANIZER ATTENDEE))
(get-writer 'CAL-ADDRESS)]
[(x-property? key)
(get-writer 'TEXT)]
[else
(warning (G_ "Unknown key ~a") key)
(get-writer 'TEXT)]))
(writer ((@@ (vcomponent base) get-vline-parameters) vline) (value vline)))
(define (property->value-tag tag . values)
(if (or (eq? tag 'VALUE)
(internal-field? tag))
#f
`(,(downcase-symbol tag)
,@(map (lambda (v)
;; TODO parameter types!!!! (rfc6321 3.5.)
`(text ,(->string v)))
values))))
;; ((key value ...) ...) -> `(parameters , ... )
(define (parameters-tag parameters)
(define outparams (filter-map
(lambda (x) (apply property->value-tag x))
parameters))
(unless (null? outparams)
`(parameters ,@outparams)))
(define (vcomponent->sxcal component)
(define tagsymb (downcase-symbol (type component)))
(remove null?
`(,tagsymb
;; only have <properties> when it's non-empty.
,(let ((props
(filter-map
(match-lambda
[(? (compose internal-field? car)) #f]
[(key vlines ...)
(remove null?
`(,(downcase-symbol key)
,(parameters-tag (reduce assq-merge
'() (map parameters vlines)))
,@(for vline in vlines
(vline->value-tag vline))))]
[(key . vline)
(remove null?
`(,(downcase-symbol key)
,(parameters-tag (parameters vline))
,(vline->value-tag vline)))])
(properties component))))
(unless (null? props)
`(properties
;; NOTE
;; (x-hnh-calendar-name (text ,(prop (parent component) 'NAME)))
,@props)))
,(unless (null? (children component))
`(components ,@(map vcomponent->sxcal (children component)))))))
(define (ns-wrap sxml)
`(icalendar (@ (xmlns "urn:ietf:params:xml:ns:icalendar-2.0"))
,sxml))
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