Alert System with Trading Dashboard

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © goodgains


//@version=5
indicator("Alert System with Trading Dashboard", overlay = true)

// @keywords: alert-system, trading-dashboard, multi-timeframe, mtf-ema, ema-crossover, ema-crossunder, dual-ema, crossover-alerts, crossunder-alerts, timeframe-status, bull-bear, status-table, four-timeframes, fast-slow-ema, ema-8-34, trend-direction, ema-trend, mtf-cross, table-dashboard, minute-timeframes

tf1 = input.timeframe('1', title = 'Timeframe 1')
tf2 = input.timeframe('3', title = 'Timeframe 2')
tf3 = input.timeframe('5', title = 'Timeframe 3')
tf4 = input.timeframe('15', title = 'Timeframe 4')

ma_length1 = input.int(8, title = 'MA Length 1')
ma_length2 = input.int(34, title = 'MA Length 2')

plot(ta.ema(close, ma_length1), title = "MA 1", color = color.yellow)
plot(ta.ema(close, ma_length2), title = "MA 2", color = color.teal)

cross_function(tf, length1, length2) =>
    cross_type = request.security(syminfo.tickerid, tf, ta.crossover(ta.ema(close[1], length1), ta.ema(close[1], length2)) ? 1 : ta.crossunder(ta.ema(close[1], length1), ta.ema(close[1], length2)) ? -1 : 0, lookahead = barmerge.lookahead_on)
    
    var last_cross = 0
    last_cross := cross_type == 1 ? 1 : cross_type == -1 ? -1 : last_cross[1]
    
    [cross_type, last_cross]
    

[tf1_function_value, tf1_last] = cross_function(tf1, ma_length1, ma_length2)
[tf2_function_value, tf2_last]  = cross_function(tf2, ma_length1, ma_length2)
[tf3_function_value, tf3_last]  = cross_function(tf3, ma_length1, ma_length2)
[tf4_function_value, tf4_last]  = cross_function(tf4, ma_length1, ma_length2)

//DASHBOARD
panelbull_color = input.color(#27a69b, title='Bull Color', inline='1', group='Visual Settings')
panelbear_color = input.color(#b63632, title='Bear Color', inline='1', group='Visual Settings')

LabelSize = input.string(defval='Medium', options=['Small', 'Medium', 'Large'], title='Dashboard Size', inline='2', group='Visual Settings')
label_size = LabelSize == 'Small' ? size.small : LabelSize == 'Medium' ? size.normal : LabelSize == 'Large' ? size.large : size.small
positioning = position.top_right 
dashboard_color = input.color(color.new(#131722, 0), title='BG Color', inline='2', group='Visual Settings')
dashboard_text = input.color(#ffffff, title='Text Color', inline='2', group='Visual Settings')
dashboard_bull = color.new(panelbull_color,40)
dashboard_bear = color.new(panelbear_color,40)

tf1_color = tf1_last == 1 ? panelbull_color : panelbear_color
tf2_color = tf2_last == 1 ? panelbull_color : panelbear_color
tf3_color = tf3_last == 1 ? panelbull_color : panelbear_color
tf4_color = tf4_last == 1 ? panelbull_color : panelbear_color

if tf1_function_value == 1 and tf1_function_value[1] != 1
    alert(tf1 + 'min Cross Above' , alert.freq_once_per_bar)
if tf2_function_value == 1 and tf2_function_value[1] != 1
    alert(tf2 + 'min Cross Above' , alert.freq_once_per_bar)
if tf3_function_value == 1 and tf3_function_value[1] != 1
    alert(tf3 + 'min Cross Above' , alert.freq_once_per_bar)
if tf4_function_value == 1 and tf4_function_value[1] != 1
    alert(tf4 + 'min Cross Above' , alert.freq_once_per_bar)

if tf1_function_value == -1 and tf1_function_value[1] != -1
    alert(tf1 + 'min Cross Below' , alert.freq_once_per_bar)
if tf2_function_value == -1 and tf2_function_value[1] != -1
    alert(tf2 + 'min Cross Below' , alert.freq_once_per_bar)
if tf3_function_value == -1 and tf3_function_value[1] != -1
    alert(tf3 + 'min Cross Below' , alert.freq_once_per_bar)
if tf4_function_value == -1 and tf4_function_value[1] != -1
    alert(tf4 + 'min Cross Below' , alert.freq_once_per_bar)


//TABLE
var table t = table.new(positioning, 4, 1, frame_color=color.new(dashboard_color, 100), frame_width=1, border_color=color.new(dashboard_color, 100), border_width=1)
if barstate.islast
    table.cell(t, 0, 0, text= tf1 , width=0, bgcolor=tf1_color, text_color=dashboard_text, text_size=label_size, text_halign=text.align_center)
    table.cell(t, 1, 0, text= tf2, width=0, bgcolor=tf2_color, text_color=dashboard_text, text_size=label_size, text_halign=text.align_center)
    table.cell(t, 2, 0, text= tf3, width=0, bgcolor=tf3_color, text_color=dashboard_text, text_size=label_size, text_halign=text.align_center)
    table.cell(t, 3, 0, text= tf4, width=0, bgcolor=tf4_color, text_color=dashboard_text, text_size=label_size, text_halign=text.align_center)