-- More information about this indicator can be found at:
--http://fxcodebase.com/code/viewtopic.php?f=17&t=69756

--+------------------------------------------------------------------+
--|                               Copyright © 2020, Gehtsoft USA LLC |
--|                                            http://fxcodebase.com |
--+------------------------------------------------------------------+
--|                                      Developed by : Mario Jemic  |
--|                                           mario.jemic@gmail.com  |
--|                          https://AppliedMachineLearning.systems  |
--+------------------------------------------------------------------+
--|                                 Support our efforts by donating  |
--|                                   Paypal: https://goo.gl/9Rj74e  |
--|                                  Patreon: https://goo.gl/GdXWeN  |
--+------------------------------------------------------------------+

-- Light dashboard template v.1.1

local Modules = {};
-- Sources v1.3
local sources = {}
sources.last_id = 1
sources.ids = {}
sources.items = {}
function sources:Request(id, source, tf, isBid, instrument)
	local ids = {}
	ids.loading_id = self.last_id
	ids.loaded_id = self.last_id + 1
	ids.loaded = false
	self.last_id = self.last_id + 2
	self.ids[id] = ids

    if tf == nil then
        tf = source:barSize()
    end
	if isBid == nil then
		isBid = source:isBid()
    end
    if instrument == nil then
        instrument = source:instrument();
    end

	self.items[id] = core.host:execute("getSyncHistory", instrument, tf, isBid, 100, ids.loaded_id, ids.loading_id)
	return self.items[id];
end
function sources:AsyncOperationFinished(cookie, successful, message, message1, message2)
	for index, ids in pairs(self.ids) do
		if ids.loaded_id == cookie then
			ids.loaded = true
			self.allLoaded = nil
			return true
		elseif ids.loading_id == cookie then
			ids.loaded = false
			self.allLoaded = false
			return false
		end
	end
	return false
end
function sources:IsAllLoaded()
	if self.allLoaded == nil then
		for index, ids in pairs(self.ids) do
			if not ids.loaded then
				self.allLoaded = false
				return false
			end
		end
		self.allLoaded = true
	end
	return self.allLoaded
end

-- USER DEFINITIONS SECTION
local indi_name = "jorgelg93 Scanner";
local indi_version = "1";

function CreateIndicators(source)
    local indicators = {};

    local macd_1_source = sources:Request(1, source, instance.parameters.macd_1_tf)
    local macd_2_source = sources:Request(2, source, instance.parameters.macd_2_tf)
    local ma_1_source = sources:Request(3, source, instance.parameters.ma_1_tf)
    local ma_2_source = sources:Request(4, source, instance.parameters.ma_2_tf)
    indicators[#indicators + 1] = core.indicators:create("MACD", macd_1_source, instance.parameters.macd_1_SN, instance.parameters.macd_1_LN);
    indicators[#indicators + 1] = core.indicators:create("MACD", macd_2_source, instance.parameters.macd_2_SN, instance.parameters.macd_2_LN);
    indicators[#indicators + 1] = CreateAverages(instance.parameters.ma_1_period, instance.parameters.ma_1_method, ma_1_source);
    indicators[#indicators + 1] = CreateAverages(instance.parameters.ma_2_period, instance.parameters.ma_2_method, ma_2_source);

    return indicators;
end

function AddAverages(id, name, default)
    indicator.parameters:addString(id, name, "", default);
    indicator.parameters:addStringAlternative(id, "MVA", "", "MVA");
    indicator.parameters:addStringAlternative(id, "EMA", "", "EMA");
    indicator.parameters:addStringAlternative(id, "Wilder", "", "Wilder");
    indicator.parameters:addStringAlternative(id, "LWMA", "", "LWMA");
    indicator.parameters:addStringAlternative(id, "SineWMA", "", "SineWMA");
    indicator.parameters:addStringAlternative(id, "TriMA", "", "TriMA");
    indicator.parameters:addStringAlternative(id, "LSMA", "", "LSMA");
    indicator.parameters:addStringAlternative(id, "SMMA", "", "SMMA");
    indicator.parameters:addStringAlternative(id, "HMA", "", "HMA");
    indicator.parameters:addStringAlternative(id, "ZeroLagEMA", "", "ZeroLagEMA");
    indicator.parameters:addStringAlternative(id, "DEMA", "", "DEMA");
    indicator.parameters:addStringAlternative(id, "T3", "", "T3");
    indicator.parameters:addStringAlternative(id, "ITrend", "", "ITrend");
    indicator.parameters:addStringAlternative(id, "Median", "", "Median");
    indicator.parameters:addStringAlternative(id, "GeoMean", "", "GeoMean");
    indicator.parameters:addStringAlternative(id, "REMA", "", "REMA");
    indicator.parameters:addStringAlternative(id, "ILRS", "", "ILRS");
    indicator.parameters:addStringAlternative(id, "IE/2", "", "IE/2");
    indicator.parameters:addStringAlternative(id, "TriMAgen", "", "TriMAgen");
    indicator.parameters:addStringAlternative(id, "JSmooth", "", "JSmooth");
    indicator.parameters:addStringAlternative(id, "KAMA", "", "KAMA");
    indicator.parameters:addStringAlternative(id, "ARSI", "", "ARSI");
    indicator.parameters:addStringAlternative(id, "VIDYA", "", "VIDYA");
    indicator.parameters:addStringAlternative(id, "HPF", "", "HPF");
    indicator.parameters:addStringAlternative(id, "VAMA", "", "VAMA");
    indicator.parameters:addStringAlternative(id, "Regression", "", "REGRESSION");
end
function CreateAverages(period, method, source)
    if method == "MVA" or method == "EMA" or method == "ARSI"
       or method == "KAMA" or method == "LWMA" or method == "SMMA"
        or method == "VIDYA" or method == "REGRESSION"
    then
        --assert(core.indicators:findIndicator(method) ~= nil, method .. " indicator must be installed");
        return core.indicators:create(method, source, period);
    end
    assert(core.indicators:findIndicator("AVERAGES") ~= nil, "Please, download and install AVERAGES indicator");
    return core.indicators:create("AVERAGES", source, method, period);
end

function CreateParameters()
    indicator.parameters:addString("macd_1_tf", "MACD 1 Timeframe", "", "m5");
    indicator.parameters:setFlag("macd_1_tf", core.FLAG_BARPERIODS);
    indicator.parameters:addInteger("macd_1_SN", "MACD 1 Short EMA", "", 12, 2, 1000);
    indicator.parameters:addInteger("macd_1_LN", "MACD 1 Long EMA", "", 26, 2, 1000);
    
    indicator.parameters:addString("ma_1_tf", "MA 1 Timeframe", "", "m5");
    indicator.parameters:setFlag("ma_1_tf", core.FLAG_BARPERIODS);
    indicator.parameters:addInteger("ma_1_period", "MA 1 Period", "", 13);
    AddAverages("ma_1_method", "MA 1 Method", "EMA");
    
    indicator.parameters:addString("ma_2_tf", "MA 2 Timeframe", "", "m5");
    indicator.parameters:setFlag("ma_2_tf", core.FLAG_BARPERIODS);
    indicator.parameters:addInteger("ma_2_period", "MA 2 Period", "", 26);
    AddAverages("ma_2_method", "MA 2 Method", "EMA");
    
    indicator.parameters:addString("macd_2_tf", "MACD 2 Timeframe", "", "m5");
    indicator.parameters:setFlag("macd_2_tf", core.FLAG_BARPERIODS);
    indicator.parameters:addInteger("macd_2_SN", "MACD 2 Short EMA", "", 12, 2, 1000);
    indicator.parameters:addInteger("macd_2_LN", "MACD 2 Long EMA", "", 26, 2, 1000);
end

function GetLastSignal(indi, source)
    for i, v in ipairs(indi) do
        if v.DATA:size() == 0 then
            return 0, "-";
        end
    end
    if indi[1].MACD[NOW] > 0 and indi[2].MACD[NOW] > 0 and indi[3].DATA[NOW] > indi[3].DATA[NOW - 1] and indi[4].DATA[NOW] > indi[4].DATA[NOW - 1] then
        return 1, "Up";
    elseif indi[1].MACD[NOW] < 0 and indi[2].MACD[NOW] < 0 and indi[3].DATA[NOW] < indi[3].DATA[NOW - 1] and indi[4].DATA[NOW] < indi[4].DATA[NOW - 1] then
        return -1, "Down";
    end
    return 0, "-";
end
-- ENF OF USER DEFINITIONS SECTION

function Init()
    indicator:name(indi_name .. " v." .. indi_version);
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
    indicator:setTag("Version", indi_version)

    CreateParameters();

    indicator.parameters:addGroup("Instruments");
    indicator.parameters:addBoolean("all_instruments", "All instruments", "", false);
    for i = 1, 20, 1 do
        Add(i);
    end
    
    indicator.parameters:addGroup("Styling");
    indicator.parameters:addColor("up_color", "Up color", "", core.rgb(0, 255, 0));
    indicator.parameters:addColor("dn_color", "Down color", "", core.rgb(255, 0, 0));
    indicator.parameters:addColor("text_color", "Text color", "", core.rgb(0, 0, 0));
    indicator.parameters:addColor("background_color", "Background color", "", core.rgb(255, 255, 255));
    indicator.parameters:addColor("signal_background_color", "Active signal background color", "", core.rgb(250, 250, 210));
    indicator.parameters:addDouble("cells_gap", "Gap coefficient", "", 1.2);
    indicator.parameters:addColor("grid_color", "Grid color", "", core.rgb(128, 128, 128));
    indicator.parameters:addBoolean("draw_grid", "Draw grid", "", false);
    indicator.parameters:addString("grid_mode", "Grid mode", "", "v")
    indicator.parameters:addStringAlternative("grid_mode", "Horizontal", "", "h")
    indicator.parameters:addStringAlternative("grid_mode", "Vertical", "", "v")
end

function Add(id)
    local Init = {"EUR/USD", "USD/JPY", "GBP/USD", "USD/CHF", "EUR/CHF"
                , "AUD/USD", "USD/CAD", "NZD/USD", "EUR/GBP", "EUR/JPY"
                , "GBP/JPY", "CHF/JPY", "GBP/CHF", "EUR/AUD", "EUR/CAD"
                , "AUD/CAD", "AUD/JPY", "CAD/JPY", "NZD/JPY", "GBP/CAD"
            };
    indicator.parameters:addBoolean("use_pair" .. id, "Use This Slot", "", id <= 5);
    indicator.parameters:addString("Pair" .. id, "Pair", "", Init[id]);
    indicator.parameters:setFlag("Pair" .. id, core.FLAG_INSTRUMENTS);
end

local items = {};
local instruments = {};
local timeframes = {};

local text_color;
local TIMER_ID = 1;
local last_id = 1;

local dde_server, dde_topic;
function PrepareInstrument(instrument)
    local symbol = {};
    symbol.Pair = instrument;
    symbol.Point = core.host:findTable("offers"):find("Instrument", symbol.Pair).PointSize;
    symbol.SymbolIndex = #instruments + 1;
    function symbol:DoLoad()
        self.Indicators = CreateIndicators(instance.source);
    end
    last_id = last_id + 2;
    items[#items + 1] = symbol;
    instruments[#instruments + 1] = instrument;
end

local timer_handle;
-- Cells builder v.1.3
local CellsBuilder = {};
CellsBuilder.GapCoeff = 1.2;
function CellsBuilder:Clear(context)
    self.Columns = {};
    self.RowHeights = {};
    self.Context = context;
end
function CellsBuilder:Add(font, text, color, column, row, mode, backgound, grid_pen, grid_top, grid_bottom)
    if self.Columns[column] == nil then
        self.Columns[column] = {};
        self.Columns[column].Rows = {};
        self.Columns[column].MaxWidth = 0;
        self.Columns[column].MaxHeight = 0;
        self.Columns[column].MaxRowIndex = 0;
    end
    local cell = {};
    cell.Text = text;
    cell.Font = font;
    cell.Color = color;
    local w, h = self.Context:measureText(font, text, mode);
    cell.Width = w;
    cell.Height = h;
    cell.Mode = mode;
    cell.Background = backgound;
    cell.GridPen = grid_pen;
    cell.DrawGridTop = grid_top;
    cell.DrawGridBottom = grid_bottom;
    self.Columns[column].Rows[row] = cell;
    if self.Columns[column].MaxRowIndex < row then
        self.Columns[column].MaxRowIndex = row;
    end
    if self.Columns[column].MaxWidth < w then
        self.Columns[column].MaxWidth = w;
    end
    if self.RowHeights[row] == nil or self.RowHeights[row] < h then
        self.RowHeights[row] = h;
    end
end
function CellsBuilder:GetTotalWidth()
    local width = 0;
    for columnIndex, column in ipairs(self.Columns) do
        width = width + column.MaxWidth * self.GapCoeff;
    end
    return width;
end
function CellsBuilder:GetTotalHeight()
    local height = 0;
    for i = 0, self.Columns[1].MaxRowIndex do
        if self.RowHeights[i] ~= nil then
            height = height + self.RowHeights[i] * self.GapCoeff;
        end
    end
    return height;
end
function CellsBuilder:Draw(x, y)
    local max_height = self:GetTotalHeight();
    local max_width = self:GetTotalWidth();
    local total_width = 0;
    for columnIndex, column in ipairs(self.Columns) do
        local total_height = 0;
        for i = 0, column.MaxRowIndex do
            local cell = column.Rows[i];
            if cell ~= nil then
                local background = -1;
                if cell.Background ~= nil then
                    background = cell.Background;
                end
                local x_start = x + total_width;
                local y_start = y + total_height;
                local x_end = x + total_width + column.MaxWidth * self.GapCoeff;
                local y_end = y + total_height + self.RowHeights[i] * self.GapCoeff;
                self.Context:drawText(cell.Font, cell.Text, 
                    cell.Color, background, 
                    x_start + column.MaxWidth * (self.GapCoeff - 1) / 2, 
                    y_start + self.RowHeights[i] * (self.GapCoeff - 1) / 2, 
                    x_end, 
                    y_end,
                    cell.Mode);
                if cell.GridPen ~= nil then
                    if cell.DrawGridTop then
                        self.Context:drawLine(cell.GridPen, x_start, y_start, x_end, y_start); -- top
                    end
                    if cell.DrawGridBottom then
                        self.Context:drawLine(cell.GridPen, x_start, y_end, x_end, y_end); -- bottom
                    end
                    self.Context:drawLine(cell.GridPen, x_start, y_start, x_start, y_end); -- left
                    self.Context:drawLine(cell.GridPen, x_end, y_start, x_end, y_end); -- right
                end
            end
            if self.RowHeights[i] ~= nil then
                total_height = total_height + self.RowHeights[i] * self.GapCoeff;
            end
        end
        total_width = total_width + column.MaxWidth * self.GapCoeff;
    end
end

function Prepare(nameOnly)
    instance:name(indi_name);
    if nameOnly then
        return;
    end
    text_color = instance.parameters.text_color;

    if instance.parameters.all_instruments then
        local enum = core.host:findTable("offers"):enumerator();
        local row = enum:next();
        while (row ~= nil) do
            PrepareInstrument(row.Instrument);
            row = enum:next();
        end
    else
        for i = 1, 20, 1 do
            if instance.parameters:getBoolean("use_pair" .. i) then
                PrepareInstrument(instance.parameters:getString("Pair" .. i));
            end
        end
    end
    timer_handle = core.host:execute("setTimer", TIMER_ID, 1);
    core.host:execute("setStatus", "Loading");
    instance:ownerDrawn(true);
    CellsBuilder.GapCoeff = instance.parameters.cells_gap;
end

local init = false;
local FONT = 1;
local FONT_TEXT = 2;
local BG_PEN = 3;
local BG_BRUSH = 4;
local GRID_PEN = 5;

local draw_grid, grid_mode;

function GetTableIndex(symbol)
    if grid_mode == "h" then
        return 2, symbol.SymbolIndex + 1;
    end

    return (symbol.SymbolIndex + 1), 2;
end

function DrawSignal(symbol, context)
    if symbol.Text == nil then
        return;
    end
    local row, column = GetTableIndex(symbol);
    if symbol.Signal == 0 or symbol.Signal == nil then
        CellsBuilder:Add(FONT_TEXT, symbol.Text, text_color, column, row, context.CENTER, backgound, GRID_PEN, true, false);
        return;
    end

    local backgound = -1;
    local color = symbol.Signal > 0 and instance.parameters.up_color or instance.parameters.dn_color;
    CellsBuilder:Add(FONT_TEXT, symbol.Text, color, column, row, context.CENTER, backgound, GRID_PEN, true, false);
end
function Draw(stage, context) 
    if stage ~= 2 then
        return;
    end
    if not init then
        context:createFont(FONT_TEXT, "Arial", 0, context:pointsToPixels(8), 0)
        context:createPen(BG_PEN, context.SOLID, 1, instance.parameters.background_color);
        context:createSolidBrush(BG_BRUSH, instance.parameters.background_color);
        draw_grid = instance.parameters.draw_grid;
        grid_mode = instance.parameters.grid_mode;
        if draw_grid then
            context:createPen(GRID_PEN, context.SOLID, 1, instance.parameters.grid_color);
        else
            GRID_PEN = nil;
        end
        init = true;
    end
    local title_w, title_h = context:measureText(FONT_TEXT, indi_name, 0);
    CellsBuilder:Clear(context);
    for i = 1, #timeframes do
        if grid_mode == "h" then
            CellsBuilder:Add(FONT_TEXT, timeframes[i], text_color, 1, (i + 1), context.CENTER);
        else
            CellsBuilder:Add(FONT_TEXT, timeframes[i], text_color, i + 1, 1, context.CENTER);
        end
    end
    for i = 1, #instruments do
        if grid_mode == "h" then
            CellsBuilder:Add(FONT_TEXT, instruments[i], text_color, i + 1, 1, context.CENTER);
        else
            CellsBuilder:Add(FONT_TEXT, instruments[i], text_color, 1, (i + 1), context.CENTER);
        end
    end
    for _, symbol in ipairs(items) do
        DrawSignal(symbol, context);
    end
    local width = math.max(title_w, CellsBuilder:GetTotalWidth());
    context:drawRectangle(BG_PEN, BG_BRUSH, context:right() - width, context:top(), context:right(), context:top() + title_h * 1.2 + CellsBuilder:GetTotalHeight());
    context:drawText(FONT_TEXT, indi_name, text_color, -1, context:right() - width, context:top(), context:right(), context:top() + title_h, 0);
    CellsBuilder:Draw(context:right() - width, context:top() + title_h * 1.2);
end

function Update(period, mode)
    for _, module in pairs(Modules) do if module.ExtUpdate ~= nil then module:ExtUpdate(nil, nil, nil); end end
end

function UpdateData()
    for _, symbol in ipairs(items) do
        if symbol.Indicators ~= nil then
            for i, indicator in ipairs(symbol.Indicators) do
                indicator:update(core.UpdateLast);
            end
            local signal, label = GetLastSignal(symbol.Indicators, symbol.Source);
            symbol.Signal = signal;
            symbol.Text = label;
		else
            symbol.Text = "...";
        end
    end
end

local loading_finished = false;
function AsyncOperationFinished(cookie, success, message, message1, message2)
    for _, module in pairs(Modules) do if module.AsyncOperationFinished ~= nil then module:AsyncOperationFinished(cookie, success, message, message1, message2); end end
    if cookie == TIMER_ID then
        UpdateData();
        if not loading_finished then
            for _, symbol in ipairs(items) do
                symbol:DoLoad();
            end
            core.host:execute("setStatus", "");
            loading_finished = true;
        end
    end
end