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// widgets_common.ysl2

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in xsl decl labels(*ptr, name="defs_by_labels") alias call-template {

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    with "hmi_element", "$hmi_element";

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    with "labels"{text *ptr};

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    content;

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};

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decl optional_labels(*ptr) alias - {

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    /* TODO add some per label xslt variable to check if exist */

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    labels(*ptr){

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        with "mandatory","'no'";

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        content;

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    }

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};

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decl activable_labels(*ptr) alias - {

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    optional_labels(*ptr) {

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        with "subelements","'active inactive'";

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        content;

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    }

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};

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

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

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    const "eltid","@id";

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    const "args" foreach "$widget/arg" > "«func:escape_quotes(@value)»"`if "position()!=last()" > ,`

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    const "indexes" foreach "$widget/path" {

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        choose {

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            when "not(@index)" {

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                choose {

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                    when "not(@type)" {

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                        warning > Widget «$widget/@type» id="«$eltid»" : No match for path "«@value»" in HMI tree

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                        > undefined

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                    }

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                    when "@type = 'PAGE_LOCAL'" 

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                        > "«@value»"

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                    when "@type = 'HMI_LOCAL'" 

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                        > hmi_local_index("«@value»")

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                    otherwise 

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                        error > Internal error while processing widget's non indexed HMI tree path : unknown type

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                }

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            }

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            otherwise {

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                > «@index»

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            }

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        }

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

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    }

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    const "minmaxes" foreach "$widget/path" {

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        choose {

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            when "@min and @max"

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                > [«@min»,«@max»]

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            otherwise

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                > undefined

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        }

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

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    }

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    |   "«@id»": new «$widget/@type»Widget ("«@id»",[«$args»],[«$indexes»],[«$minmaxes»],{

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    apply "$widget", mode="widget_defs" with "hmi_element",".";

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

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}

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emit "preamble:local-variable-indexes" {

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    ||

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    let hmi_locals = {};

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    var last_remote_index = hmitree_types.length - 1;

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    var next_available_index = hmitree_types.length;

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    const local_defaults = {

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    ||

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        if "count(path) != 1" error > VarInit «@id» must have only one variable given.

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        if "path/@type != 'PAGE_LOCAL' and path/@type != 'HMI_LOCAL'" error > VarInit «@id» only applies to HMI variable.

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    }

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    ||

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    };

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    var cache = hmitree_types.map(_ignored => undefined);

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    function page_local_index(varname, pagename){

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        let pagevars = hmi_locals[pagename];

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        let new_index;

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        if(pagevars == undefined){

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            new_index = next_available_index++;

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            hmi_locals[pagename] = {[varname]:new_index}

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        } else {

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            let result = pagevars[varname];

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            if(result != undefined) {

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                return result;

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            }

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            new_index = next_available_index++;

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            pagevars[varname] = new_index;

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        }

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        let defaultval = local_defaults[varname];

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            cache[new_index] = defaultval; 

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        return new_index;

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    }

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    function hmi_local_index(varname){

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        return page_local_index(varname, "HMI_LOCAL");

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    }

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    ||

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}

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emit "preamble:widget-base-class" {

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    ||

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    var pending_widget_animates = [];

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    class Widget {

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        offset = 0;

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        frequency = 10; /* FIXME arbitrary default max freq. Obtain from config ? */

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        unsubscribable = false;

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        pending_animate = false;

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        constructor(elt_id,args,indexes,minmaxes,members){

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            this.element_id = elt_id;

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            this.element = id(elt_id);

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            this.args = args;

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            this.indexes = indexes;

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            this.minmaxes = minmaxes;

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            Object.keys(members).forEach(prop => this[prop]=members[prop]);

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        }

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        unsub(){

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            /* remove subsribers */

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            if(!this.unsubscribable)

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                for(let i = 0; i < this.indexes.length; i++) {

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                    let index = this.indexes[i];

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                    if(this.relativeness[i])

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                        index += this.offset;

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                    subscribers(index).delete(this);

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                }

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            this.offset = 0;

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            this.relativeness = undefined;

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        }

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        sub(new_offset=0, relativeness, container_id){

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            this.offset = new_offset;

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            this.relativeness = relativeness;

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            this.container_id = container_id ;

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            /* add this's subsribers */

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            if(!this.unsubscribable)

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                for(let i = 0; i < this.indexes.length; i++) {

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                    let index = this.get_variable_index(i);

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                    if(index == undefined) continue;

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                    subscribers(index).add(this);

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                }

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            need_cache_apply.push(this); 

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        }

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        apply_cache() {

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            if(!this.unsubscribable) for(let index in this.indexes){

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                /* dispatch current cache in newly opened page widgets */

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                let realindex = this.get_variable_index(index);

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                if(realindex == undefined) continue;

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                let cached_val = cache[realindex];

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                if(cached_val != undefined)

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                    this._dispatch(cached_val, cached_val, index);

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            }

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        }

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        get_variable_index(varnum) {

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            let index = this.indexes[varnum];

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            if(typeof(index) == "string"){

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                index = page_local_index(index, this.container_id);

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            } else {

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                if(this.relativeness[varnum]){

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                    index += this.offset;

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                }

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            }

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            return index;

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        }

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        overshot(new_val, max) {

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        }

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        undershot(new_val, min) {

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        }

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        clip_min_max(index, new_val) {

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            let minmax = this.minmaxes[index];

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            if(minmax !== undefined && typeof new_val == "number") {

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                let [min,max] = minmax;

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                if(new_val < min){

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                    this.undershot(new_val, min);

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                    return min;

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                }

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                if(new_val > max){

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                    this.overshot(new_val, max);

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                    return max;

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                }

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            }

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            return new_val;

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        }

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        change_hmi_value(index, opstr) {

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            let realindex = this.get_variable_index(index);

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            if(realindex == undefined) return undefined;

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            let old_val = cache[realindex];

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            let new_val = eval_operation_string(old_val, opstr);

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            new_val = this.clip_min_max(index, new_val);

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            return apply_hmi_value(realindex, new_val);

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        }

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        apply_hmi_value(index, new_val) {

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            let realindex = this.get_variable_index(index);

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            if(realindex == undefined) return undefined;

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            new_val = this.clip_min_max(index, new_val);

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            return apply_hmi_value(realindex, new_val);

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        }

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        new_hmi_value(index, value, oldval) {

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            // TODO avoid searching, store index at sub()

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            for(let i = 0; i < this.indexes.length; i++) {

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                let refindex = this.get_variable_index(i);

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                if(refindex == undefined) continue;

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                if(index == refindex) {

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                    this._dispatch(value, oldval, i);

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                    break;

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                }

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            }

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        }

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        _dispatch(value, oldval, varnum) {

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            let dispatch = this.dispatch;

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            if(dispatch != undefined){

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                try {

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                    dispatch.call(this, value, oldval, varnum);

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                } catch(err) {

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                    console.log(err);

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                }

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            }

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        }

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        _animate(){

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            this.animate();

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            this.pending_animate = false;

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        }

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        request_animate(){

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            if(!this.pending_animate){

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                pending_widget_animates.push(this);

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                this.pending_animate = true;

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                requestHMIAnimation();

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            }

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        }

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        activate_activable(eltsub) {

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            eltsub.inactive.style.display = "none";

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            eltsub.active.style.display = "";

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        }

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        inactivate_activable(eltsub) {

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            eltsub.active.style.display = "none";

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            eltsub.inactive.style.display = "";

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        }

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    }

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    ||

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}

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// Key to filter unique types

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key "TypesKey", "widget", "@type";

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emit "declarations:hmi-classes" {

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    const "used_widget_types", """$parsed_widgets/widget[

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                                    generate-id() = generate-id(key('TypesKey', @type)) and 

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                                    not(@type = $excluded_types)]""";

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    apply "$used_widget_types", mode="widget_class";

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}

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template "widget", mode="widget_class"

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||

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class «@type»Widget extends Widget{

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    /* empty class, as «@type» widget didn't provide any */

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}

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||

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const "included_ids","$parsed_widgets/widget[not(@type = $excluded_types) and not(@id = $discardable_elements/@id)]/@id";

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const "hmi_widgets","$hmi_elements[@id = $included_ids]";

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emit "declarations:hmi-elements" {

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    | var hmi_widgets = {

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    apply "$hmi_widgets", mode="hmi_widgets";

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    | }

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}

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function "defs_by_labels" {

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    param "labels","''";

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    param "mandatory","'yes'";

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    param "subelements","/..";

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    param "hmi_element";

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    const "widget_type","@type";

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    foreach "str:split($labels)" {

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        const "name",".";

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        const "elt","$result_svg_ns//*[@id = $hmi_element/@id]//*[@inkscape:label=$name][1]";

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        choose {

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            when "not($elt/@id)" {

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                if "$mandatory='yes'" {

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                    error > «$widget_type» widget must have a «$name» element

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                }

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                // otherwise produce nothing

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            }

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            otherwise {

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                |     «$name»_elt: id("«$elt/@id»"),

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                if "$subelements" {

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                |     «$name»_sub: {

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                    foreach "str:split($subelements)" {

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                        const "subname",".";

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                        const "subelt","$elt/*[@inkscape:label=$subname][1]";

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                        choose {

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                            when "not($subelt/@id)" {

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                                if "$mandatory='yes'" {

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                                    error > «$widget_type» widget must have a «$name»/«$subname» element

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                                }

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                |         /* missing «$name»/«$subname» element */

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                            }

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                            otherwise {

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                |         "«$subname»": id("«$subelt/@id»")`if "position()!=last()" > ,`

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                            }

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                        }

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                    }

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                |     },

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                }

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            }

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        }

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    }

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}

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def "func:escape_quotes" {

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    param "txt";

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    // have to use a python string to enter escaped quote

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    // const "frstln", "string-length($frst)";

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    choose {

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        when !"contains($txt,'\"')"! {

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            result !"concat(substring-before($txt,'\"'),'\\\"',func:escape_quotes(substring-after($txt,'\"')))"!;

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        }

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        otherwise {

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            result "$txt";

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        }

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    }

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}

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