// Licensed under the Apache License, Version 2.0
// © mihakralj
//@version=6
indicator("Pivot Points (Classic)", "PIVOT", overlay=true)

//@function Calculates classic/standard/floor pivot points
//@param tf Timeframe for pivot calculation ("D", "W", "M")
//@returns Tuple [pp, r1, r2, r3, s1, s2, s3] with pivot levels
//@references Floor traders, standard pivot point formula
pivot(simple string tf) =>
    [hi, lo, cl] = request.security(syminfo.tickerid, tf, [high[1], low[1], close[1]], lookahead=barmerge.lookahead_on)
    if na(hi) or na(lo) or na(cl)
        [na, na, na, na, na, na, na]
    else
        float pp = (hi + lo + cl) / 3.0
        float r1 = 2.0 * pp - lo
        float s1 = 2.0 * pp - hi
        float r2 = pp + (hi - lo)
        float s2 = pp - (hi - lo)
        float r3 = hi + 2.0 * (pp - lo)
        float s3 = lo - 2.0 * (hi - pp)
        [pp, r1, r2, r3, s1, s2, s3]

// ---------- Main loop ----------

// Inputs
i_timeframe = input.timeframe("D", "Pivot Timeframe", options=["D", "W", "M"])
i_show_pp = input.bool(true, "Show Pivot Point")
i_show_r1 = input.bool(true, "Show R1")
i_show_r2 = input.bool(true, "Show R2")
i_show_r3 = input.bool(true, "Show R3")
i_show_s1 = input.bool(true, "Show S1")
i_show_s2 = input.bool(true, "Show S2")
i_show_s3 = input.bool(true, "Show S3")
i_color_pp = input.color(color.yellow, "PP Color")
i_color_r = input.color(color.red, "Resistance Color")
i_color_s = input.color(color.green, "Support Color")

// Calculation
[pp, r1, r2, r3, s1, s2, s3] = pivot(i_timeframe)

// Plot
plot(i_show_pp ? pp : na, "PP", color=i_color_pp, linewidth=2, style=plot.style_stepline)
plot(i_show_r1 ? r1 : na, "R1", color=i_color_r, linewidth=1, style=plot.style_stepline)
plot(i_show_r2 ? r2 : na, "R2", color=i_color_r, linewidth=1, style=plot.style_stepline)
plot(i_show_r3 ? r3 : na, "R3", color=i_color_r, linewidth=1, style=plot.style_stepline)
plot(i_show_s1 ? s1 : na, "S1", color=i_color_s, linewidth=1, style=plot.style_stepline)
plot(i_show_s2 ? s2 : na, "S2", color=i_color_s, linewidth=1, style=plot.style_stepline)
plot(i_show_s3 ? s3 : na, "S3", color=i_color_s, linewidth=1, style=plot.style_stepline)