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// svghmi.js

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function dispatch_value(index, value) {

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};

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// Open WebSocket to relative "/ws" address

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var ws = new WebSocket(window.location.href.replace(/^http(s?:\/\/[^\/]*)\/.*$/, 'ws$1/ws'));

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ws.binaryType = 'arraybuffer';

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const dvgetters = {

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    INT: [DataView.prototype.getInt16, 2],

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    BOOL: [DataView.prototype.getInt8, 1]

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    /* TODO */

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};

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// Register message reception handler 

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ws.onmessage = function (evt) {

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    let data = evt.data;

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    let dv = new DataView(data);

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    let i = 0;

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};

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function send_blob(data) {

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    if(data.length > 0) {

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    };

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};

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const typedarray_types = {

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    INT: Int16Array,

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    BOOL: Uint8Array

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    /* TODO */

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};

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function send_reset() {

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    send_blob(new Uint8Array([1])); /* reset = 1 */

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};

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// subscription state, as it should be in hmi server

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// hmitree indexed array of integers

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var subscriptions =  hmitree_types.map(_ignored => 0);

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// subscription state as needed by widget now

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// hmitree indexed array of Sets of widgets objects

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var subscribers = hmitree_types.map(_ignored => new Set());

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function update_subscriptions() {

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    let delta = [];

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    for(let index = 0; index < subscribers.length; index++){

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        let widgets = subscribers[index];

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        // periods are in ms

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        let previous_period = subscriptions[index];

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        if(widgets.size > 0) {

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            let maxfreq = 0;

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            for(let widget of widgets)

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        }

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        if(previous_period != new_period) {

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            subscriptions[index] = new_period;

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                new Uint8Array([2]), /* subscribe = 2 */

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                new Uint32Array([index]), 

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        }

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    }

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    send_blob(delta);

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};

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function update_value(index, value) {

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    iectype = hmitree_types[index];

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    jstype = typedarray_types[iectypes];

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    send_blob([

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        new Uint8Array([0]),  /* setval = 0 */

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        new jstype([value])

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        ]);

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};

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var current_page;

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function switch_page(page_name) {

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    let old_desc = page_desc[current_page];

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    let new_desc = page_desc[page_name];

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    /* TODO hide / show widgets */

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    /* TODO move viewport */

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    /* remove subsribers of previous page if any */

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    if(old_desc) for(let widget of old_desc.widgets){

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        for(let index of widget.indexes){

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            subscribers[index].delete(widget);

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        }

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    }

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    /* add new subsribers if any */

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    if(new_desc) for(let widget of new_desc.widgets){

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        for(let index of widget.indexes){

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            subscribers[index].add(widget);

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        }

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    }

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    current_page = page_name;

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    update_subscriptions();

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};

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// Once connection established

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ws.onopen = function (evt) {

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    send_reset();

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    // show main page

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    switch_page(default_page);

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};