# documentation: http://code.google.com/apis/calendar/docs/2.0/developers_guide_protocol.html

package require rest
package require tls
::http::register https 443 [list ::tls::socket]

set gcal(auth) {
   url https://www.google.com/accounts/ClientLogin
   method post
   req_args { Email: Passwd: }
   opt_args { source:tclrest }
   static_args { service cl }
   post_transform {
       regexp {Auth=(.*)\n} $result -> result
       return $result
   }
}

set gcal(all_calendars) {
    url http://www.google.com/calendar/feeds/default/allcalendars/%projection:full%
    headers { Authorization {GoogleLogin auth=%token%} }
    opt_args { gsessionid: }
    body required
}

set gcal(own_calendars) {
    url http://www.google.com/calendar/feeds/default/owncalendars/%projection:full%
    headers { Authorization {GoogleLogin auth=%token%} }
    opt_args { gsessionid: }
}

set gcal(new_calendar) {
    url http://www.google.com/calendar/feeds/default/owncalendars/full
    method post
    content-type application/atom+xml
    headers { Authorization {GoogleLogin auth=%token%} }
    opt_args { gsessionid: }
}

set gcal(edit_calendar) {
    url http://www.google.com/calendar/feeds/default/owncalendars/full/%calendar%
    method put
    content-type application/atom+xml
    headers { Authorization {GoogleLogin auth=%token%} }
    opt_args { gsessionid: }
}

set gcal(delete_calendar) {
    url http://www.google.com/calendar/feeds/default/owncalendars/full/%calendar%
    method delete
    headers { Authorization {GoogleLogin auth=%token%} }
    opt_args { gsessionid: }
}

set gcal(all_events) {
    url http://www.google.com/calendar/feeds/%user:default%/%visibility:private%/%projection:full%
    headers { Authorization {GoogleLogin auth=%token%} }
    opt_args { gsessionid: }
}

set gcal(new_event) {
    url http://www.google.com/calendar/feeds/default/private/full
    method post
    content-type application/atom+xml
    headers { Authorization {GoogleLogin auth=%token%} }
    opt_args { gsessionid: }
}

rest::create_interface gcal

proc ::gcal::handle_redir {args} {
    if {[catch {eval $args} out]} {
        #puts "catch $out"
        if {[lindex $out 1] == "302"} {
            eval [linsert $args 1 -gsessionid [rest::parameters [lindex $out 2] gsessionid]]
        } else {
            return -code error $out
        }
    }
}

proc ::gcal::create_single_event_object {args} {
    set defaults [dict create \
        text ""               \
        status confirmed      \
        where ""              \
    ]
    set args [lindex [::rest::parse_opts {} {title: start: end:} {text: status: where:} $args] 0]
    set args [dict merge $defaults $args]

    set event {}
    lappend event "<entry xmlns='http://www.w3.org/2005/Atom' xmlns:gd='http://schemas.google.com/g/2005'>"
    lappend event "<category scheme='http://schemas.google.com/g/2005#kind' term='http://schemas.google.com/g/2005#event'></category>"
    lappend event "<title type='text'>[dict get $args title]</title>"
    lappend event "<content type='text'>[dict get $args text]</content>"
    lappend event "<gd:when startTime='[clock format [clock scan [dict get $args start]] -format "%Y-%m-%dT%TZ"]' endTime='[clock format [clock scan [dict get $args end]] -format "%Y-%m-%dT%TZ"]'></gd:when>"
    lappend event "<gd:eventStatus value='http://schemas.google.com/g/2005#event.[dict get $args status]'> </gd:eventStatus>"
    lappend event "<gd:where valueString='[dict get $args where]'></gd:where>"
    lappend event "</entry>"
    return [join $event \n]
}