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// detachable_pages.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_descs", "$parsed_widgets/widget[@type = 'Page']";

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const "hmi_pages", "$hmi_elements[@id = $hmi_pages_descs/@id]";

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const "default_page" choose {

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    when "count($hmi_pages) > 1" {

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        choose {

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            when "$hmi_pages_descs/arg[1]/@value = 'Home'" > 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:widget($hmi_pages/@id)/arg[1]/@value»

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}

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emit "preamble:default-page" {

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    |

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    | var default_page = "«$default_page»";

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}

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const "keypads_descs", "$parsed_widgets/widget[@type = 'Keypad']";

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const "keypads", "$hmi_elements[@id = $keypads_descs/@id]";

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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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// variable "overlapping_geometry" was added for optimization.

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// It avoids calling func:overlapping_geometry 3 times for each page

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// (apparently libxml doesn't cache exslt function results)

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// in order to optimize further, func:overlapping_geometry 

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// should be implemented in python or even C,

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// as this is still the main bottleneck here

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const "_overlapping_geometry" {

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    foreach "$hmi_pages | $keypads" {

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        const "k", "concat('overlapping:', @id)";

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        value "ns:ProgressStart($k, concat('collecting membership of ', @inkscape:label))";

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        elt {

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            attrib "id" > «@id»

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            copy "func:overlapping_geometry(.)";

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        }

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        value "ns:ProgressEnd($k)";

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    }

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}

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const "overlapping_geometry", "exsl:node-set($_overlapping_geometry)";

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def "func:all_related_elements" {

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    param "page";

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    const "page_overlapping_geometry", "$overlapping_geometry/elt[@id = $page/@id]/*";

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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_page_elements",

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

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const "hmi_lists_descs", "$parsed_widgets/widget[@type = 'List']";

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const "hmi_lists", "$hmi_elements[@id = $hmi_lists_descs/@id]";

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const "required_list_elements", "func:refered_elements($hmi_lists[@id = $required_page_elements/@id])";

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const "required_elements", "$defs | $required_list_elements | $required_page_elements";

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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::*[

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        not(child::*[

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

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            not(@id = $short_list/@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::*/@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 | $keypads)";

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

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emit "declarations:detachable-elements" {

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    |

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    | var detachable_elements = {

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    foreach "$detachable_elements"{

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

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    }

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    | }

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}

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const "forEach_widgets_ids", "$parsed_widgets/widget[@type = 'ForEach']/@id";

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const "forEach_widgets", "$hmi_widgets[@id = $forEach_widgets_ids]";

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const "in_forEach_widget_ids", "func:refered_elements($forEach_widgets)[not(@id = $forEach_widgets_ids)]/@id";

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

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    if "ancestor::*[@id = $hmi_pages/@id]" error > HMI:Page «@id» is nested in another HMI:Page

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    const "desc", "func:widget(@id)";

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    const "pagename", "$desc/arg[1]/@value";

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    const "msg", "concat('generating page description ', $pagename)";

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    value "ns:ProgressStart($pagename, $msg)";

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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_widgets[@id = $page_all_elements/@id and @id != $page/@id]";

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    const "page_managed_widgets","$all_page_widgets[not(@id=$in_forEach_widget_ids)]";

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    const "page_relative_widgets",

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        "$page_managed_widgets[func:is_descendant_path(func:widget(@id)/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 "sumarized_page", 

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        """func:sumarized_elements($page_all_elements)""";

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    const "required_detachables", 

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        """$sumarized_page/

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

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    |   "«$pagename»": {

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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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    |     widgets: [

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    foreach "$page_managed_widgets" {

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        const "widget_paths_relativeness" 

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            foreach "func:widget(@id)/path" {

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                value "func:is_descendant_path(@value, $desc/path/@value)";

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                if "position()!=last()" > ,

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            }

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

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    }

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    |     ],

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    |     jumps: [

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    foreach "$parsed_widgets/widget[@id = $all_page_widgets/@id and @type='Jump']" {

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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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    apply "$parsed_widgets/widget[@id = $all_page_widgets/@id]", mode="widget_page"{

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        with "page_desc", "$desc";

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    }

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

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    value "ns:ProgressEnd($pagename)";

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}

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emit "definitions:page-desc" {

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    |

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    | var page_desc = {

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    apply "$hmi_pages", mode="page_desc";

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    | }

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}

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template "*", mode="widget_page";

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emit "debug:detachable-pages" {

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    |

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    | DETACHABLES:

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    foreach "$detachable_elements"{

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        |  «@id»

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    }

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    | In Foreach:

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    foreach "$in_forEach_widget_ids"{

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        |  «.»

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    }

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    | Overlapping 

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    apply "$overlapping_geometry", mode="testtree";

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}