const svgElements = {};

var colors = {true: "#66ffba", false: "#ff3067", error: "#ffff00", clicked: "#ffffff", ok: "#ffffff"};

let active_state = "MANUAL";

var description;
var changeFuncs = {};
var updateValues = {};

function formatValue(value, prec) {
    return Number(value.toPrecision(prec)).toString();
}

function handle_describing(action, modpar, data) {
    description = data;
    for (const mod of Object.keys(data.modules)) {
        const mdesc = data.modules[mod];
        if (! mdesc) {
           console.log('bad mod', mod)
           continue;
        }
        const elems = document.querySelectorAll("[id^='" + mod + ":']");
        let stateElement = null;
        let clickElement = null;
        elems.forEach(elem => {
            let [parmod, ...func] = elem.id.split('-');
            const [mod, param] = parmod.split(':');
            // console.log(mod, param, func);
            if (func.includes("click")) {
                clickElement = elem;
                console.log(mod, param, func, elem);
                addClickListener(elem, mod, toggleTarget);
            }
            if (func.includes("fault")) {
                changeFuncs[mod + ":status"] = function (value) {
                    changeFill(elem, value[0] < 400 ? "ok" : "error");
                }
            }
            if (func.includes("state")) {
                stateElement = elem;
                changeFuncs[mod + ":" + (param || 'value')] = function (value) {
                    changeFill(elem, value);
                }
            }
            if (func.includes("text")) {
                const pat = elem.textContent;
                console.log('X', elem)
                changeFuncs[mod + ":" + (param || 'value')] = function (value) {
                    let [repl, dot, fix] = pat.match(/\*(\.)?(\d)?/);
                    if (dot) {
                       formatted = value.toFixed(fix || 0);
                    } else {
                       formatted = formatValue(value, fix || 5);
                    }
                    elem.textContent = pat.replace(repl, formatted);
                    console.log('Y', elem)
                }
            }
            if (func.includes("command")) {
                console.log(func, mod, param);
                addClickListener(elem, mod + ":" + param, sendCommand);
            }
        })
        if (stateElement && clickElement) {
            // the clickElement needs a reference to the state for toggleTarget()
            clickElement.stateElement = stateElement;
        }
    }
    console.log('ACTIVATE', changeFuncs);
    websocket.send("activate");
}

function handle_update(action, modpar, data) {
    // console.log(action, modpar, data);
    if (modpar in changeFuncs) {
        updateValues[modpar] = data[0];
    }
}

handle_reply = handle_update;
handle_changed = handle_update;

function handle_error_update(action, modpar, data) {
}

function handleMSG(msg) {
    const [action, modpar, ...tail] = msg.split(" ");
    let data = tail.join(' ');
    if (data) {
        data = JSON.parse(data);
    }
    handler = window["handle_" + action];
    if (handler) {
        handler(action, modpar, data);
    } else {
        console.log(msg);
    }
}

function processUpdates() {
    let updates = updateValues;
    updateValues = {};
    for (const [modpar, value] of Object.entries(updates)) {
        // console.log('process', modpar, value);
        changeFuncs[modpar](value);
    }
    requestAnimationFrame(processUpdates);
}


function handleStateClick(state) {
    changeState("dil", state);
    document.getElementById(state.toLowerCase() + "-btn").style.backgroundColor = "white";
    document.getElementById(active_state.toLowerCase() + "-btn").style.backgroundColor = "rgb(175, 176, 177)";
    active_state = state;
}


function updateState(state) {
    document.getElementById(state.toLowerCase() + "-btn").style.backgroundColor = "white";
    document.getElementById(active_state.toLowerCase() + "-btn").style.backgroundColor = "rgb(175, 176, 177)";
    active_state = state;
}

function changeFill(element, state) {
    // stateElement = element.stateElement || element;
    element.state = state;
    if (state in colors) {
        element.style.fill = colors[state];
    } else {
        element.style.fill = "#eaeaea" ;
    }
}

function writeToScreen(message) {
    const output = document.getElementById("outputtext");
    output.value += message;
    output.scrollTop = output.scrollHeight;
}

function doConnect() {
    websocket = new WebSocket(wsaddr);
    websocket.onopen = evt => onOpen(evt);
    websocket.onclose = evt => onClose(evt);
    websocket.onmessage = evt => handleMSG(evt.data);
    websocket.onerror = evt => onError(evt);
}

function onOpen(evt) {
    writeToScreen("Connected to "+ wsaddr + "\n");
    websocket.send("describe");
    /*
    for (var mod in ctr_state) {
       readValue(mod);
    }
    startPolling();
    */
}

function changeState(mod, value) {
    doSend(`change ${mod}:target "${value}"`);
    //writeToScreen(`change ${mod}:target "${value}"\n`);
}

function onClose(evt) {
    writeToScreen("disconnected\n");
}

function onError(evt) {
    if (evt.data === undefined) {
        writeToScreen("Unable to connect to "+ wsaddr + "\n");
    } else {
        writeToScreen("error: " + evt.data + '\n');
        websocket.close();
    }

}

function doSend(message) {
    // send a change or do message
    console.log('doSend');
    if (! writable) {
        console.log('unprotected doSend')
        return;
    }
    console.log('>', message);
    websocket.send(message);
}

function warnViewOnly() {
    if (writable) return false;
    alert('please set the page ACTIVE to change things');
    return true;
}

function toggleTarget(element, mod) {
    if (warnViewOnly()) return;
    stateElement = element.stateElement || element
    const newState = stateElement.state === false;
    console.log('click', element, mod, stateElement.state, newState);
    changeFill(element, "clicked");
    doSend(`change ${mod}:target ${newState}`);
}

function sendCommand(element, modcmd) {
    if (warnViewOnly()) return;
    console.log('command', modcmd);
    doSend(`do ${modcmd}`);
}

function addClickListener(element, arg, func) {
    element.addEventListener('click', () => { func(element, arg); });
    element.classList.add('clickable');
}

window.onload = function () {
    doConnect();
    requestAnimationFrame(processUpdates);
}