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// detachable_elements.ysl2

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//

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// compute what elements are required by pages

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// and decide where to cut when removing/attaching 

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// pages elements on page switch

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const "hmi_pages", "$hmi_elements[func:parselabel(@inkscape:label)/widget/@type = 'Page']";

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const "default_page" choose {

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    when "count($hmi_pages) > 1" {

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        const "Home_page", 

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            "$hmi_pages[func:parselabel(@inkscape:label)/widget/arg[1]/@value = 'Home']";

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        choose {

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            when "$Home_page" > Home

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            otherwise {

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                error "No Home page defined!";

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            }

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        }

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    }

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    when "count($hmi_pages) = 0" {

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        error "No page defined!";

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    }

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    otherwise > «func:parselabel($hmi_pages/@inkscape:label)/widget/arg[1]/@value»

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}

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// returns all directly or indirectly refered elements

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def "func:refered_elements" {

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    param "elems";

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    const "descend", "$elems/descendant-or-self::svg:*";

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    const "clones", "$descend[self::svg:use]";

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    const "originals", "//svg:*[concat('#',@id) = $clones/@xlink:href]";

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    choose {

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        when "$originals"

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            result "$descend | func:refered_elements($originals)";

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        otherwise

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            result "$descend";

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    }

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}

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def "func:all_related_elements" {

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    param "page";

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    const "page_overlapping_geometry", "func:overlapping_geometry($page)";

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    const "page_overlapping_elements", "//svg:*[@id = $page_overlapping_geometry/@Id]";

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    const "page_sub_elements", "func:refered_elements($page | $page_overlapping_elements)";

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    result "$page_sub_elements";

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}

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def "func:required_elements" {

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    param "pages"; 

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    choose{

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        when "$pages"{

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            result """func:all_related_elements($pages[1])

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                      | func:required_elements($pages[position()!=1])""";

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        }otherwise{

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            result "/..";

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        }

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    }

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}

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const "required_elements",

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    """//svg:defs/descendant-or-self::svg:*

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       | func:required_elements($hmi_pages)/ancestor-or-self::svg:*""";

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const "discardable_elements", "//svg:*[not(@id = $required_elements/@id)]";

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def "func:sumarized_elements" {

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    param "elements";

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    const "short_list", "$elements[not(ancestor::*/@id = $elements/@id)]";

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    const "filled_groups", """$short_list/parent::svg:*[

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        not(descendant::*[

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            not(self::svg:g) and

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            not(@id = $discardable_elements/@id) and

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            not(@id = $short_list/descendant-or-self::*[not(self::svg:g)]/@id)

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        ])]""";

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    const "groups_to_add", "$filled_groups[not(ancestor::*/@id = $filled_groups/@id)]";

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    result "$groups_to_add | $short_list[not(ancestor::svg:g/@id = $filled_groups/@id)]";

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}

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def "func:detachable_elements" {

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    param "pages";

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    choose{

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        when "$pages"{

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            result """func:sumarized_elements(func:all_related_elements($pages[1]))

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                      | func:detachable_elements($pages[position()!=1])""";

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        }otherwise{

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            result "/..";

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        }

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    }

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}

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// Avoid nested detachables

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const "_detachable_elements", "func:detachable_elements($hmi_pages)";

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const "detachable_elements", "$_detachable_elements[not(ancestor::*/@id = $_detachable_elements/@id)]";

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def "func:is_descendant_path" {

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    param "descend";

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    param "ancest";

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    result "string-length($ancest) > 0 and starts-with($descend,$ancest)";

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}

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template "svg:*", mode="page_desc" {

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    const "desc", "func:parselabel(@inkscape:label)/widget";

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    const "page", ".";

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    const "p", "$geometry[@Id = $page/@id]";

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    const "page_all_elements", "func:all_related_elements($page)";

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    const "all_page_widgets","$hmi_elements[@id = $page_all_elements/@id and @id != $page/@id]";

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    const "page_relative_widgets",

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        "$all_page_widgets[func:is_descendant_path(func:parselabel(@inkscape:label)/widget/path/@value, $desc/path/@value)]";

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    // Take closest ancestor in detachable_elements

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    // since nested detachable elements are filtered out

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    const "required_detachables", 

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        """func:sumarized_elements($page_all_elements)/

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           ancestor-or-self::*[@id = $detachable_elements/@id]""";

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    |   "«$desc/arg[1]/@value»": {

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    |     widget: hmi_widgets["«@id»"],

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    |     bbox: [«$p/@x», «$p/@y», «$p/@w», «$p/@h»],

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    if "$desc/path/@value" {

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        if "count($desc/path/@index)=0"

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            warning > Page id="«$page/@id»" : No match for path "«$desc/path/@value»" in HMI tree

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    |     page_index: «$desc/path/@index»,

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    }

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    |     relative_widgets: [

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    foreach "$page_relative_widgets" {

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    |         hmi_widgets["«@id»"]`if "position()!=last()" > ,`

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    }

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    |     ],

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    |     absolute_widgets: [

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    foreach "$all_page_widgets[not(@id = $page_relative_widgets/@id)]" {

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    |         hmi_widgets["«@id»"]`if "position()!=last()" > ,`

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    }

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    |     ],

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    |     required_detachables: {

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    foreach "$required_detachables" {

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    |         "«@id»": detachable_elements["«@id»"]`if "position()!=last()" > ,`

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    }

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    |     }

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    |   }`if "position()!=last()" > ,`

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}

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function "debug_detachables" {

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    foreach "$detachable_elements"{

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        |  «@id»

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    }

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}

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!debug_output_calls.append("debug_detachables")