-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=60727

--+------------------------------------------------------------------+
--|                               Copyright © 2018, Gehtsoft USA LLC |
--|                                            http://fxcodebase.com |
--+------------------------------------------------------------------+
--|                                      Developed by : Mario Jemic  |
--|                                          mario.jemic@gmail.com   |
--+------------------------------------------------------------------+
--|                                 Support our efforts by donating  |
--|                                    Paypal: https://goo.gl/9Rj74e |
--+------------------------------------------------------------------+
--|                                Patreon :  https://goo.gl/GdXWeN  |
--|                    BitCoin : 15VCJTLaz12Amr7adHSBtL9v8XomURo9RF  |
--|                BitCoin Cash: 1BEtS465S3Su438Kc58h2sqvVvHK9Mijtg  |
--|           Ethereum : 0x8C110cD61538fb6d7A2B47858F0c0AaBd663068D  |
--|                   LiteCoin : LLU8PSY2vsq7B9kRELLZQcKf5nJQrdeqwD  |
--+------------------------------------------------------------------+

local Top, Bottom
local source = nil
local threshold;
local indi_alerts = {};
indi_alerts.Version = "2.1";
indi_alerts.inverted_arrows = false;
local alerts = 
{ 
    {
        Stage = 102,
        UpCondition = function (period)
            return (Top[period] - Bottom[period]) / source:pipSize() >= threshold;
        end,
        DownCondition = function (period)
            return (Bottom[period] - Top[period]) / source:pipSize() >= threshold;
        end,
        FormatMessage = function(source, period, level, label, isUp)
            return string.format(
                "Label: %s\013\010" ..
                "Instrument: %s\013\010" ..
                "Time Frame: %s\013\010" ..
                "Price: %s\013\010" .. 
                "Date: %s", 
                isUp and (label .. " Bull pattern") or (label .. " Bear pattern"), 
                source:instrument(), 
                source:barSize(), 
                win32.formatNumber(source[NOW], false, source:getPrecision()), 
                core.formatDate(core.now()));
        end,
        OnChange = true,
        Name = "Alert Name"
    }
};

function Init()
    indicator:name("ZigZag Channel")
    indicator:description(" ")
    indicator:requiredSource(core.Tick)
    indicator:type(core.Indicator)
    indicator.parameters:addGroup("Calculation")
    indicator.parameters:addInteger("Depth", "Depth", "the minimal amount of bars where there will not be the second maximum", 12)
    indicator.parameters:addInteger("Deviation", "Deviation", "Distance in pips to eliminate the second maximum in the last Depth periods", 5)
    indicator.parameters:addInteger("Backstep", "Backstep", "The minimal amount of bars between maximums/minimums", 3)
    indicator.parameters:addInteger("Period", "Period", "Period", 1)
    indicator.parameters:addInteger("zz", "Period", "Period", 1)

    indicator.parameters:addGroup("Zig Zag Line Style")
    indicator.parameters:addColor("Zig_color", "Up swing color", "Up swing color", core.rgb(0, 255, 0))
    indicator.parameters:addColor("Zag_color", "Down swing color", "Down swing color", core.rgb(255, 0, 0))
    indicator.parameters:addInteger("widthZigZag", "Line width", "Line width", 1, 1, 5)
    indicator.parameters:addInteger("styleZigZag", "Line style", "Line style", core.LINE_SOLID)
    indicator.parameters:setFlag("styleZigZag", core.FLAG_LEVEL_STYLE)

    indicator.parameters:addGroup("Line Style")
    indicator.parameters:addColor("UpColor", "Up Line color", "Up Line color", core.rgb(0, 255, 0))
    indicator.parameters:addColor("DownColor", "Down Line color", "Down Line color", core.rgb(255, 0, 0))
    indicator.parameters:addInteger("Width", "Line width", "Line width", 1, 1, 5)
    indicator.parameters:addInteger("Style", "Line style", "Line style", core.LINE_SOLID)
    indicator.parameters:setFlag("Style", core.FLAG_LEVEL_STYLE)

    indi_alerts:AddParameters(indicator.parameters);
    for i,alert in ipairs(alerts) do
        indi_alerts:AddAlert(alert.Name);
    end
    indicator.parameters:addDouble("threshold", "Alert threshold", "", 0)
end

local Depth
local Deviation
local Backstep
local first
local bid, ask;
local Period
local ZigC
local ZagC
local out
local HighMap = nil
local LowMap = nil
local TextBuff = nil
local AverageBuff = nil
local pipSize
local format
local Width, UpColor, DownColor, Style
local loading = true;
function Prepare(nameOnly)
    threshold = instance.parameters.threshold;
    Depth = instance.parameters.Depth
    Deviation = instance.parameters.Deviation
    Backstep = instance.parameters.Backstep
    Period = instance.parameters.Period
    source = instance.source
    first = source:first()

    Width = instance.parameters.Width
    UpColor = instance.parameters.UpColor
    DownColor = instance.parameters.DownColor
    Style = instance.parameters.Style

    format = "%." .. 1 .. "f"

    local name =
        profile:id() ..
        "(" .. source:name() .. ", " .. Depth .. ", " .. Deviation .. ", " .. Backstep .. ", " .. Period .. ")"
    instance:name(name)

    if (nameOnly) then
        return
    end
    if source:isBid() then
        bid = source;
        ask = core.host:execute("getHistory", 2, source:instrument(), source:barSize(), source:date(0), 0, false);
    else
        ask = source;
        bid = core.host:execute("getHistory", 2, source:instrument(), source:barSize(), source:date(0), 0, true);
    end

    out = instance:addStream("out", core.Line, name, "Up", instance.parameters.Zig_color, first)
    out:setWidth(instance.parameters.widthZigZag)
    out:setStyle(instance.parameters.styleZigZag)

    Top = instance:addStream("Top", core.Line, name, "Top", UpColor, first)
    Top:setWidth(Width)
    Top:setStyle(Style)

    Bottom = instance:addStream("Bottom", core.Line, name, "Bottom", DownColor, first)
    Bottom:setWidth(Width)
    Bottom:setStyle(Style)

    ZigC = instance.parameters.Zig_color
    ZagC = instance.parameters.Zag_color

    HighMap = instance:addInternalStream(0, 0)
    LowMap = instance:addInternalStream(0, 0)
    SearchMode = instance:addInternalStream(0, 0)
    Peak = instance:addInternalStream(0, 0)
    pipSize = source:pipSize()

    indi_alerts:Prepare();
    indi_alerts.source = instance.source;
    instance:drawOnMainChart(true);
    instance:ownerDrawn(true);
end

function Draw(stage, context) indi_alerts:Draw(stage, context, source); end

local searchBoth = 0
local searchPeak = 1
local searchLawn = -1
local lastlow = nil
local lashhigh = nil

function RegisterPeak(period, mode, peak)
    out:setBookmark(1, out:getBookmark(2))
    out:setBookmark(2, period)
    SearchMode[period] = mode
    Peak[period] = peak
end

function ReplaceLastPeak(period, mode, peak)
    out:setBookmark(2, period)
    SearchMode[period] = mode
    Peak[period] = peak
end

local lastserial = -1

function Update(period, mode)
    if loading then
        return;
    end
    period = period - 1
    if period < 0 or source:serial(period) == lastserial then
        return
    end
    local bid_period = core.findDate(bid, source:date(period), false);
    if bid_period == -1 then
        return;
    end
    local ask_period = core.findDate(ask, source:date(period), false);
    if ask_period == -1 then
        return;
    end

    if mode == core.UpdateAll then
        lastlow = nil
        lasthigh = nil
    end

    lastserial = source:serial(period);

    if ask_period <= Depth then
        return;
    end
    -- fill high/low maps
    -- get the lowest low for the last depth periods
    local val = mathex.min(ask, ask_period - Depth + 1, ask_period)
    if val == lastlow then
        -- if lowest low is not changed - ignore it
        val = nil
    else
        -- keep it
        lastlow = val
        -- if current low is higher for more than Deviation pips, ignore
        if (ask[ask_period] - val) > (source:pipSize() * Deviation) then
            val = nil
        else
            -- check for the previous backstep lows
            for i = period - 1, period - Backstep + 1, -1 do
                if (LowMap[i] ~= 0) and (LowMap[i] > val) then
                    LowMap[i] = 0
                end
            end
        end
    end
    if ask[ask_period] == val then
        LowMap[period] = val
    else
        LowMap[period] = 0
    end
    if bid_period <= Depth then
        return;
    end
    -- get the lowest low for the last depth periods
    val = mathex.max(bid, bid_period - Depth + 1, bid_period)
    if val == lasthigh then
        -- if lowest low is not changed - ignore it
        val = nil
    else
        -- keep it
        lasthigh = val
        -- if current low is higher for more than Deviation pips, ignore
        if (val - bid[bid_period]) > (source:pipSize() * Deviation) then
            val = nil
        else
            -- check for the previous backstep lows
            for i = period - 1, period - Backstep + 1, -1 do
                if (HighMap[i] ~= 0) and (HighMap[i] < val) then
                    HighMap[i] = 0
                end
            end
        end
    end
    if bid[bid_period] == val then
        HighMap[period] = val
    else
        HighMap[period] = 0
    end

    local prev_peak = out:getBookmark(1)
    local start = Depth
    local last_peak_i = out:getBookmark(2)
    if last_peak_i ~= -1 then
        start = last_peak_i
    end

    for i = start, period, 1 do
        if last_peak_i == -1 then
            if (HighMap[i] ~= 0) then
                last_peak_i = i
                RegisterPeak(i, searchLawn, HighMap[i])
            elseif (LowMap[i] ~= 0) then
                last_peak_i = i
                RegisterPeak(i, searchPeak, LowMap[i])
            end
        elseif SearchMode[last_peak_i] == searchPeak then
            if (LowMap[i] ~= 0 and LowMap[i] < Peak[last_peak_i]) then
                last_peak_i = i
                if prev_peak ~= -1 then
                    core.drawLine(out, core.range(prev_peak, i), Peak[prev_peak], prev_peak, LowMap[i], i, ZagC)
                    out:setColor(prev_peak, ZigC)
                end
                ReplaceLastPeak(i, searchPeak, LowMap[i])
            end
            if HighMap[i] ~= 0 and LowMap[i] == 0 then
                core.drawLine(out, core.range(last_peak_i, i), Peak[last_peak_i], last_peak_i, HighMap[i], i, ZigC)
                out:setColor(last_peak_i, ZagC)
                prev_peak = last_peak_i
                last_peak_i = i
                RegisterPeak(i, searchLawn, HighMap[i])
            end
        elseif SearchMode[last_peak_i] == searchLawn then
            if (HighMap[i] ~= 0 and HighMap[i] > Peak[last_peak_i]) then
                last_peak_i = i
                if prev_peak ~= -1 then
                    core.drawLine(out, core.range(prev_peak, i), Peak[prev_peak], prev_peak, HighMap[i], i, ZigC)
                    out:setColor(prev_peak, ZagC)
                end
                ReplaceLastPeak(i, searchLawn, HighMap[i])
            end
            if LowMap[i] ~= 0 and HighMap[i] == 0 then
                if Peak[last_peak_i] > LowMap[i] then
                    core.drawLine(out, core.range(last_peak_i, i), Peak[last_peak_i], last_peak_i, LowMap[i], i, ZagC)
                    out:setColor(last_peak_i, ZigC)
                else
                    core.drawLine(out, core.range(last_peak_i, i), Peak[last_peak_i], last_peak_i, LowMap[i], i, ZigC)
                    out:setColor(last_peak_i, ZagC)
                end
                prev_peak = last_peak_i
                last_peak_i = i
                RegisterPeak(i, searchPeak, LowMap[i])
            end
        end
    end

    if period < source:size() - 2 then
        return
    end

    local Up = {}
    local Down = {}
    local Total = 0
    local searchMode = 0;
    for i = source:size() - 2, first, -1 do
        if (SearchMode[i] ~= searchMode and SearchMode[i] ~= 0) then
            Total = Total + 1
            if searchMode == searchLawn then
                searchMode = searchPeak;
                if Total > Period then
                    Up[#Up + 1] = i
                end
            else
                searchMode = searchLawn;
                if Total > Period then
                    Down[#Down + 1] = i
                end
            end
            if Total == Period + 4 then
                DrawLine(Up[1], Up[2], Top, UpColor, true)
                DrawLine(Down[1], Down[2], Bottom, DownColor, false)
                break
            end
        end
    end
    for _, alert in ipairs(indi_alerts.Alerts) do Activate(alert, period, period ~= source:size() - 1); end
end

function DrawLine(x1, x2, target, color, isBid)
    local y1, y2;
    if isBid then
        local xx = core.findDate(bid, source:date(x1), false);
        y1 = bid[xx];
        xx = core.findDate(bid, source:date(x2), false);
        y2 = bid[xx];
    else
        local xx = core.findDate(ask, source:date(x1), false);
        y1 = ask[xx];
        xx = core.findDate(ask, source:date(x2), false);
        y2 = ask[xx];
    end
    local a1, c1 = math2d.lineEquation(x1, y1, x2, y2)
    local Y1 = (source:size() - 1) * a1 + c1
    core.drawLine(target, core.range(x2, source:size() - 1), y2, x2, Y1, source:size() - 1, color)
    for period = x2 - 1, first, -1 do
        if target[period] ~= nil then
            target[period] = nil
        else
            break
        end
    end
end

function AsyncOperationFinished(cookie, successful, message, message1, message2)
    indi_alerts:AsyncOperationFinished(cookie, success, message, message1, message2)
    if cookie == 1 then
        loading = true;
    elseif cookie == 2 then
        loading = false;
        instance:updateFrom(0);
    end
end


function Activate(alert, period, historical_period)
    if indi_alerts.Live ~= "Live" then period = period - 1; end
    alert.Alert[period] = 0;
    if not alert.ON then
        if indi_alerts.FIRST then indi_alerts.FIRST = false; end
        return;
    end
    if alert.UpCondition(period) and (not alert.OnChange or not alert.UpCondition(period - 1)) then
        alert:UpAlert(source, period, source[period], historical_period);
    elseif alert.DownCondition(period) and (not alert.OnChange or not alert.DownCondition(period - 1)) then
        alert:DownAlert(source, period, source[period], historical_period);
    end

    if indi_alerts.FIRST then indi_alerts.FIRST = false; end
end

indi_alerts.last_id = 0;
indi_alerts.FIRST = true;
indi_alerts._alerts = {};
indi_alerts._advanced_alert_timer = nil;
function indi_alerts:AddParameters(parameters)
    indicator.parameters:addGroup("Alert Mode");  
    indicator.parameters:addString("Live", "End of Turn / Live", "", "Live");
    indicator.parameters:addStringAlternative("Live", "End of Turn", "", "End of Turn");
    indicator.parameters:addStringAlternative("Live", "Live", "", "Live");
    indicator.parameters:addBoolean("strategy_output", "Output for strategies", "Used by the strategies", false);

    indicator.parameters:addInteger("ToTime", "Convert the date to", "", 6)
    indicator.parameters:addIntegerAlternative("ToTime", "EST", "", 1)
    indicator.parameters:addIntegerAlternative("ToTime", "UTC", "", 2)
    indicator.parameters:addIntegerAlternative("ToTime", "Local", "", 3)
    indicator.parameters:addIntegerAlternative("ToTime", "Server", "", 4)
    indicator.parameters:addIntegerAlternative("ToTime", "Financial", "", 5)
    indicator.parameters:addIntegerAlternative("ToTime", "Display", "", 6)
    
    indicator.parameters:addGroup("Alert Style");
    indicator.parameters:addInteger("Size", "Label Size", "", 10, 1 , 100);
    
    indicator.parameters:addGroup("Alerts");
    indicator.parameters:addBoolean("Show", "Show Dialog box Alert", "", false);
    indicator.parameters:addBoolean("ShowAlert", "Show Alert", "", false);
    
    indicator.parameters:addGroup("Alerts Sound");
    indicator.parameters:addBoolean("PlaySound", "Play Sound", "", false);    
    indicator.parameters:addBoolean("RecurrentSound", "Recurrent Sound", "", false);
    
    indicator.parameters:addGroup("Alerts Email");
    indicator.parameters:addBoolean("SendEmail", "Send Email", "", false);
    indicator.parameters:addString("Email", "Email", "", "");
    indicator.parameters:setFlag("Email", core.FLAG_EMAIL);

    indicator.parameters:addGroup("External Alerts");
    indicator.parameters:addBoolean("use_advanced_alert", "Send Advanced Alert", "Telegram/Discord/other platform (like MT4)", false)
	indicator.parameters:addString("advanced_alert_key", "Advanced Alert Key",
		"You can get a key via @profit_robots_bot Telegram Bot. Visit ProfitRobots.com for Discord/other platform keys", "")
end

function indi_alerts:AsyncOperationFinished(cookie, success, message, message1, message2) if cookie == self._advanced_alert_timer and #self._alerts > 0 then if self._advanced_alert_key == nil then return; end local data = self:ArrayToJSON(self._alerts); self._alerts = {}; local req = http_lua.createRequest(); local query = string.format('{"Key":"%s","StrategyName":"%s","Platform":"FXTS2","Notifications":%s}', self._advanced_alert_key, string.gsub(self.StrategyName or "", '"', '\\"'), data); req:setRequestHeader("Content-Type", "application/json"); req:setRequestHeader("Content-Length", tostring(string.len(query))); req:start("http://profitrobots.com/api/v1/notification", "POST", query); end end
function indi_alerts:ToJSON(item)
    local json = {};
    function json:AddStr(name, value) local separator = ""; if self.str ~= nil then separator = ","; else self.str = ""; end self.str = self.str .. string.format("%s\"%s\":\"%s\"", separator, tostring(name), tostring(value)); end
    function json:AddNumber(name, value) local separator = ""; if self.str ~= nil then separator = ","; else self.str = ""; end self.str = self.str .. string.format("%s\"%s\":%f", separator, tostring(name), value or 0); end
    function json:AddBool(name, value) local separator = ""; if self.str ~= nil then separator = ","; else self.str = ""; end self.str = self.str .. string.format("%s\"%s\":%s", separator, tostring(name), value and "true" or "false"); end
    function json:ToString() return "{" .. (self.str or "") .. "}"; end
    local first = true; for idx,t in pairs(item) do  local stype = type(t) if stype == "number" then json:AddNumber(idx, t); elseif stype == "string" then json:AddStr(idx, t); elseif stype == "boolean" then json:AddBool(idx, t); elseif stype == "function" or stype == "table" then else core.host:trace(tostring(idx) .. " " .. tostring(stype)); end end
    return json:ToString();
end
function indi_alerts:ArrayToJSON(arr) local str = "["; for i, t in ipairs(self._alerts) do local json = self:ToJSON(t); if str == "[" then str = str .. json; else str = str .. "," .. json; end end return str .. "]"; end
function indi_alerts:AddAlert(label)
    self.last_id = self.last_id + 1;
    indicator.parameters:addGroup(label .. " Alert");

    indicator.parameters:addBoolean("ON" .. self.last_id , "Show " .. label .." Alert" , "", true);

    indicator.parameters:addString("drawing_mode" .. self.last_id, "Drawing mode", "", "arrows");
    indicator.parameters:addStringAlternative("drawing_mode" .. self.last_id, "Arrows", "", "arrows");
    indicator.parameters:addStringAlternative("drawing_mode" .. self.last_id, "Vertical lines", "", "vlines");

    indicator.parameters:addFile("Up" .. self.last_id, label .. " Cross Over Sound", "", "");
    indicator.parameters:setFlag("Up" .. self.last_id, core.FLAG_SOUND);
    indicator.parameters:addInteger("UpSymbol" .. self.last_id, "Up Symbol", "", 217);
    indicator.parameters:addColor("UpColor" .. self.last_id, "Up Color", "", core.rgb(0, 255, 0));
    
    indicator.parameters:addFile("Down" .. self.last_id, label .. " Cross Under Sound", "", "");
    indicator.parameters:setFlag("Down" .. self.last_id, core.FLAG_SOUND);
    indicator.parameters:addInteger("DownSymbol" .. self.last_id, "Down Symbol", "", 218);
    indicator.parameters:addColor("DownColor" .. self.last_id, "Down Color", "", core.rgb(255, 0, 0));

    indicator.parameters:addString("Label" .. self.last_id, "Label", "", label);
end

function indi_alerts:AddSingleAlert(Label)
    self.last_id = self.last_id + 1;
    indicator.parameters:addGroup(Label .. " Alert");

    indicator.parameters:addBoolean("ON" .. self.last_id , "Show " .. Label .." Alert" , "", true);

    indicator.parameters:addFile("Up" .. self.last_id, Label .. " Sound", "", "");
    indicator.parameters:setFlag("Up" .. self.last_id, core.FLAG_SOUND);
    indicator.parameters:addInteger("UpSymbol" .. self.last_id, "Symbol", "", 217);
    indicator.parameters:addColor("UpColor" .. self.last_id, "Color", "", core.rgb(0, 255, 0));
    
    indicator.parameters:addString("Label" .. self.last_id, "Label", "", Label);
end

function indi_alerts:DrawAlert(context, alert, period)
    if not alert.Alert:hasData(period) then
        return;
    end

    if alert.Alert[period] == 1 then
        local x = context:positionOfBar(period);
        if alert.DrawingMode == "arrows" then
            visible, y = context:pointOfPrice(alert.AlertLevel[period]);
            width, height = context:measureText(self._stages[alert.Stage].FONT_ID, alert.UpSymbol, 0);
            local x1 = x - width / 2;
            local x2 = x + width / 2;
            local y1, y2;
            if self.inverted_arrows then
                y1 = y;
                y2 = y + height;
            else
                y1 = y - height;
                y2 = y;
            end
			context:drawText(self._stages[alert.Stage].FONT_ID, alert.UpSymbol, alert.UpColor, -1, x1, y1, x2, y2, 0);
        else
            context:drawLine(alert.UpLinePen, x, context:top(), x, context:bottom());
        end
	elseif alert.Alert[period] == -1 then
        local x = context:positionOfBar(period);
        if alert.DrawingMode == "arrows" then
            visible, y = context:pointOfPrice(alert.AlertLevel[period]);
            width, height = context:measureText(self._stages[alert.Stage].FONT_ID, alert.DownSymbol, 0);
            local x1 = x - width / 2;
            local x2 = x + width / 2;
            local y1, y2;
            if self.inverted_arrows then
                y1 = y - height;
                y2 = y;
            else
                y1 = y;
                y2 = y + height;
            end
            context:drawText(self._stages[alert.Stage].FONT_ID, alert.DownSymbol, alert.DownColor, -1, x1, y1, x2, y2, 0);
        else
            context:drawLine(alert.DownLinePen, x, context:top(), x, context:bottom());
        end
    end
end
indi_alerts.NextId = 1;
indi_alerts._stages = {};
function indi_alerts:Draw(stage, context)
    if self._stages[stage] == nil then
        self._stages[stage] = {};
        self._stages[stage].createFont = false;
        for _, level in ipairs(self.Alerts) do
            if level.Stage == stage then
                if level.DrawingMode == "vlines" then
                    level.UpLinePen = self.NextId;
                    self.NextId = self.NextId + 1;
                    level.DownLinePen = self.NextId;
                    self.NextId = self.NextId + 1;
                    context:createPen(level.UpLinePen, context.SOLID, 1, level.UpColor);
                    context:createPen(level.DownLinePen, context.SOLID, 1, level.DownColor);
                else
                    self._stages[stage].createFont = true;
                end
            end
        end
        if self._stages[stage].createFont and self._stages[stage].FONT_ID == nil then
            self._stages[stage].FONT_ID = self.NextId;
			self.NextId = self.NextId + 1;
            context:createFont(self._stages[stage].FONT_ID, "Wingdings", context:pointsToPixels(self.Size), context:pointsToPixels(self.Size), 0);
        end
    end
    for period = math.max(context:firstBar(), self.source:first()), math.min(context:lastBar(), self.source:size()-1), 1 do
        for _, level in ipairs(self.Alerts) do
            if level.Stage == stage then
                self:DrawAlert(context, level, period);
            end
        end
    end
end
indi_alerts.Alerts = {};
function indi_alerts:GetTimezone()
    local tz = instance.parameters.ToTime;
    if tz == 1 then
        return core.TZ_EST
    elseif tz == 2 then
        return core.TZ_UTC
    elseif tz == 3 then
        return core.TZ_LOCAL
    elseif tz == 4 then
        return core.TZ_SERVER
    elseif tz == 5 then
        return core.TZ_FINANCIAL
    elseif tz == 6 then
        return core.TZ_TS
    end
end
function indi_alerts:Prepare()
    self.Show = instance.parameters.Show;
    self.Live = instance.parameters.Live;
    self.ShowAlert = instance.parameters.ShowAlert;
    self.ToTime = self:GetTimezone();
    
    self.Size = instance.parameters.Size;
    self.SendEmail = instance.parameters.SendEmail;

    self.PlaySound = instance.parameters.PlaySound;
    local i;
    for i = 1, 100 do 
        local on = instance.parameters:getBoolean("ON" .. i);
        if on == nil then
            break;
        end 
        local alert = {};
        alert.id = i;
        alert.UpCondition = alerts[i].UpCondition;
        alert.FormatMessage = alerts[i].FormatMessage;
        alert.DownCondition = alerts[i].DownCondition;
        alert.OnChange = alerts[i].OnChange;
        alert.Stage = alerts[i].Stage;
        alert.Label = instance.parameters:getString("Label" .. i);
        alert.ON = on;
        alert.DrawingMode = instance.parameters:getString("drawing_mode" .. i);
        alert.UpSymbol = string.char(instance.parameters:getInteger("UpSymbol" .. i));
        local down_symbol = instance.parameters:getInteger("DownSymbol" .. i);
        if down_symbol ~= nil then
            alert.DownSymbol = string.char(down_symbol);
        end
        alert.UpColor = instance.parameters:getColor("UpColor" .. i);
        alert.DownColor = instance.parameters:getColor("DownColor" .. i);
        alert.Up = self.PlaySound and instance.parameters:getString("Up" .. i) or nil;
        alert.Down = self.PlaySound and instance.parameters:getString("Down" .. i) or nil;
        if alert.DownSymbol == nil then
            alert.DownSymbol = alert.UpSymbol;
            alert.DownColor = alert.UpColor;
            alert.Down = alert.Up;
        end
        assert(not(self.PlaySound) or (self.PlaySound and alert.Up ~= "") or (self.PlaySound and alert.Up ~= ""), "Sound file must be chosen"); 
        assert(not(self.PlaySound) or (self.PlaySound and alert.Down ~= "") or (self.PlaySound and alert.Down ~= ""), "Sound file must be chosen");
        alert.U = nil;
        alert.D = nil;
        if instance.parameters.strategy_output then
            alert.Alert = instance:addStream("strat_signal_" .. i, core.Dot, "strat_signal_" .. i, "Strategy signal #" .. i, core.rgb(0, 0, 0), 0, 0);
        else
            alert.Alert = instance:addInternalStream(0, 0);
        end
        alert.AlertLevel = instance:addInternalStream(0, 0);
        function alert:DownAlert(source, period, level, historical_period)
            local text = self.FormatMessage(source, period, level, self.Label, false);
            shift = indi_alerts.Live ~= "Live" and 1 or 0;
            self.Alert[period] = -1;
            self.AlertLevel[period] = level;
            self.U = nil;
            if self.D ~= source:date(period) and period == source:size() - 1 - shift and not indi_alerts.FIRST then
                self.D = source:date(period);
                if not historical_period then
                    indi_alerts:SoundAlert(self.Down);
                    indi_alerts:EmailAlert(self.Label, text, period);
                    indi_alerts:SendAlert(self.Label, text, period);
                    if indi_alerts.Show then
                        indi_alerts:Pop(self.Label, text);
                    end
                end
            end
        end
        function alert:UpAlert(source, period, level, historical_period)
            local text = self.FormatMessage(source, period, level, self.Label, true);
            shift = indi_alerts.Live ~= "Live" and 1 or 0;
            self.Alert[period] = 1;
            self.AlertLevel[period] = level;
            self.D = nil;
            if self.U ~= source:date(period) and period == source:size() - 1 - shift and not indi_alerts.FIRST then
                self.U = source:date(period);
                if not historical_period then
                    indi_alerts:SoundAlert(self.Up);
                    indi_alerts:EmailAlert(self.Label, text, period);
                    indi_alerts:SendAlert(self.Label, text, period);
                    if indi_alerts.Show then
                        indi_alerts:Pop(self.Label, text);
                    end
                end
            end
        end
        function alert:GetLast(period)
            for i = period, 0, -1 do
                if self.Alert:hasData(i) and self.Alert[i] ~= 0 then
                    return self.Alert[i], i, self.AlertLevel[i];
                end
            end
        end
        self.Alerts[#self.Alerts + 1] = alert;
    end

    self.Email = self.SendEmail and instance.parameters.Email or nil;
    assert(not(self.SendEmail) or (self.SendEmail and self.Email ~= ""), "E-mail address must be specified");
    self.RecurrentSound = instance.parameters.RecurrentSound;

    if instance.parameters.advanced_alert_key ~= "" and instance.parameters.use_advanced_alert then
        self._advanced_alert_key = instance.parameters.advanced_alert_key;
        require("http_lua");
        self._advanced_alert_timer = 1234;
        core.host:execute("setTimer", self._advanced_alert_timer, 1);
    end
end

function indi_alerts:Pop(label, note)
    core.host:execute("prompt", 1, label, self.source:instrument() .. " " .. label .. " : " .. note);
end

function indi_alerts:SoundAlert(Sound)
    if not self.PlaySound then
        return;
    end
    terminal:alertSound(Sound, self.RecurrentSound);
end

function indi_alerts:EmailAlert(label, Subject, period)
    if not self.SendEmail then
        return
    end

    local now = self.source:date(period);
    now = core.host:execute("convertTime", core.TZ_EST, self.ToTime, now);
    local DATA = core.dateToTable(now)
    local delim = "\013\010";  
    local Note = profile:id().. delim.. " Label : " ..label  .. delim .. " Alert : " .. Subject;   
    local Symbol = "Instrument : " .. self.source:instrument() ;
    local Time =  " Date : " .. DATA.month.." / ".. DATA.day .." Time:  ".. DATA.hour  .." / ".. DATA.min .." / ".. DATA.sec; 
    local TF = "Time Frame : " .. source:barSize()
    local text = Note  .. delim ..  Symbol .. delim .. TF .. delim .. Time;
    terminal:alertEmail(self.Email, profile:id(), text);
end

function indi_alerts:SendAlert(label, Subject, period)
    if not self.ShowAlert then
        return;
    end
    
    local now = self.source:date(period);
    now = core.host:execute("convertTime", core.TZ_EST, self.ToTime, now);
    local DATA = core.dateToTable(now)
    local delim = "\013\010";  
    local Note = profile:id().. delim.. " Label : " ..label  .. delim .. " Alert : " .. Subject;
    local Symbol= "Instrument : " .. self.source:instrument() ;
    local Time =  " Date : " .. DATA.month.." / ".. DATA.day .." Time:  ".. DATA.hour  .." / ".. DATA.min .." / ".. DATA.sec;  
    local TF = "Time Frame : " .. source:barSize()
    local text = Note  .. delim ..  Symbol .. delim .. TF .. delim .. Time;
    terminal:alertMessage(self.source:instrument(), self.source[NOW], text, self.source:date(NOW));
end

function indi_alerts:AlertTelegram(message, instrument, timeframe) local alert = {}; alert.Text = message or ""; alert.Instrument = instrument or ""; alert.TimeFrame = timeframe or ""; self._alerts[#self._alerts + 1] = alert; end