MACD = Moving Average Convergence Divergence

// This Pine Script® code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © Piotr Kowalski "piecioshka"
// Docs (EN): https://github.com/piecioshka/tradingview-pine-scripts/blob/main/indicators/oscillators/macd/macd.md
// Docs (PL): https://github.com/piecioshka/tradingview-pine-scripts/blob/main/indicators/oscillators/macd/macd.pl.md

//@version=6
indicator('MACD = Moving Average Convergence Divergence', overlay=false, max_lines_count=100, max_labels_count=100)

// --- Color palette (single place for the theme) ---
cMacd   = color.rgb(56, 104, 174)   // MACD line
cSignal = color.rgb(215, 107, 52)   // signal line
cUp     = color.green               // rise / buy signal
cDn     = color.red                 // fall / sell signal
cMid    = color.gray                // zero line and neutral elements

// --- Inputs ---
gFast = 'Fast EMA (shorter)'
fastLen  = input.int(12, 'Length', minval=1, group=gFast, tooltip='Window of the faster average.')
fastType = input.string('EMA', 'Type', options=['SMA', 'EMA', 'WMA', 'VWMA', 'RMA'], group=gFast)

gSlow = 'Slow EMA (longer)'
slowLen  = input.int(26, 'Length', minval=1, group=gSlow, tooltip='Window of the slower average.')
slowType = input.string('EMA', 'Type', options=['SMA', 'EMA', 'WMA', 'VWMA', 'RMA'], group=gSlow)

gSig = 'Signal line'
sigLen  = input.int(9, 'Length', minval=1, group=gSig, tooltip='Smoothing of the MACD line = signal line.')
sigType = input.string('EMA', 'Type', options=['SMA', 'EMA', 'WMA', 'VWMA', 'RMA'], group=gSig)

gView = 'Display'
showHist    = input.bool(true,  'Histogram',                     group=gView, tooltip='Columns of the MACD − signal difference.')
showSignals = input.bool(true,  'Signals (markers on price)',    group=gView, tooltip='Markers on the price panel when MACD crosses the signal line: green below the candle on a cross up, red above the candle on a cross down. Shape and size in the Appearance group.')
showLabels  = input.bool(false, 'BUY CLOSE / BUY OPEN markers',  group=gView, tooltip='Markers on the MACD panel at crossings. Off by default.')
showTable   = input.bool(true,  'Status table',                  group=gView, tooltip='Small corner panel with values and trend.')

gA = 'Appearance'
shapeName = input.string('Triangle', 'Marker shape', options=['Triangle', 'Arrow', 'Label arrow', 'Circle', 'Diamond'], group=gA, tooltip='Triangle - solid triangle.\nArrow - small thin arrow.\nLabel arrow - arrow-shaped label bubble.\nCircle / Diamond - neutral dot markers.')
sizeName  = input.string('Small', 'Marker size', options=['Tiny', 'Small', 'Normal', 'Large'], group=gA)

// Markers as labels - the shape is picked from an input, which plotshape() cannot do (its style must be a constant).
upStyle    = shapeName == 'Arrow' ? label.style_arrowup : shapeName == 'Label arrow' ? label.style_label_up : shapeName == 'Circle' ? label.style_circle : shapeName == 'Diamond' ? label.style_diamond : label.style_triangleup
downStyle  = shapeName == 'Arrow' ? label.style_arrowdown : shapeName == 'Label arrow' ? label.style_label_down : shapeName == 'Circle' ? label.style_circle : shapeName == 'Diamond' ? label.style_diamond : label.style_triangledown
markerSize = sizeName == 'Tiny' ? size.tiny : sizeName == 'Normal' ? size.normal : sizeName == 'Large' ? size.large : size.small

// --- Calculations ---
maOf(src, len, kind) =>
    switch kind
        'SMA'  => ta.sma(src, len)
        'EMA'  => ta.ema(src, len)
        'WMA'  => ta.wma(src, len)
        'VWMA' => ta.vwma(src, len)
        'RMA'  => ta.rma(src, len)
        => ta.ema(src, len)

macd      = maOf(close, fastLen, fastType) - maOf(close, slowLen, slowType)
signal    = maOf(macd, sigLen, sigType)
histogram = macd - signal
crossUp   = ta.crossover(macd, signal)    // MACD crosses the signal line up -> bullish impulse
crossDn   = ta.crossunder(macd, signal)   // MACD crosses the signal line down -> bearish impulse

// --- Drawing (histogram below the lines) ---
histColor = histogram >= 0 ? (histogram > histogram[1] ? color.new(cUp, 50) : color.new(cUp, 80)) : (histogram < histogram[1] ? color.new(cDn, 50) : color.new(cDn, 80))
plot(showHist ? histogram : na, 'Histogram', color=histColor, linewidth=2, style=plot.style_columns)
plot(macd,   'MACD',   color=cMacd,   linewidth=2)
plot(signal, 'Signal', color=cSignal, linewidth=2, linestyle=plot.linestyle_dotted)
hline(0, 'Zero', color=cMid, linestyle=hline.style_dotted)

// --- Signals (compact markers + optional panel markers) ---
// Markers on the price panel: bullish cross = green below the candle, bearish = red above
if showSignals and crossUp
    label.new(bar_index, na, '', yloc=yloc.belowbar, style=upStyle, color=cUp, size=markerSize, force_overlay=true)
if showSignals and crossDn
    label.new(bar_index, na, '', yloc=yloc.abovebar, style=downStyle, color=cDn, size=markerSize, force_overlay=true)
// Markers on the MACD panel (off by default)
if showLabels and crossUp
    label.new(bar_index, macd, '', style=upStyle, color=cUp, size=markerSize)
if showLabels and crossDn
    label.new(bar_index, signal, '', style=downStyle, color=cDn, size=markerSize)

// --- Alerts ---
alertcondition(crossUp, 'MACD: cross up',   'MACD crossed the signal line up (bullish impulse)')
alertcondition(crossDn, 'MACD: cross down', 'MACD crossed the signal line down (bearish impulse)')

// --- Status table (top-right corner) ---
trend      = macd > signal ? 'Bullish' : macd < signal ? 'Bearish' : 'Neutral'
trendColor = macd > signal ? cUp : macd < signal ? cDn : cMid

var table infoTable = table.new(position.top_right, 2, 3, border_width=1, border_color=color.new(cMid, 70))
if showTable and barstate.islast
    table.cell(infoTable, 0, 0, 'MACD',   text_color=cMid,       text_size=size.small)
    table.cell(infoTable, 1, 0, str.tostring(macd, '#.###'),   text_color=color.white, text_size=size.small)
    table.cell(infoTable, 0, 1, 'Signal', text_color=cMid,       text_size=size.small)
    table.cell(infoTable, 1, 1, str.tostring(signal, '#.###'), text_color=color.white, text_size=size.small)
    table.cell(infoTable, 0, 2, 'Trend',  text_color=cMid,       text_size=size.small)
    table.cell(infoTable, 1, 2, trend,    text_color=trendColor, text_size=size.small)