Wave 2 Flat Detection - B Breaks A High, C Breaks A Low

//version=5
indicator("Wave 2 Flat Detection - B Breaks A High, C Breaks A Low", overlay=true)

// === Parameters ===
wave1_len = 10 // length of wave 1
a_len = 5 // candles to look for Wave A
b_len = 3 // candles to look for Wave B
c_len = 3 // candles to look for Wave C

// === Detect Wave 1 (upward impulse) ===
wave1_start = low[wave1_len]
wave1_end = high[0]
wave1_valid = wave1_end > wave1_start * 1.05 // 5% move up

// === Wave A ===
a_start = high[wave1_len] // assumed wave 1 top
a_end = low[a_len] // correction low (Wave A end)
wave_a_valid = a_end < a_start

// === Wave B ===
b_high = high[b_len]
wave_b_valid = b_high > a_start // B breaks above A's high

// === Wave C ===
c_low = low[0]
wave_c_break = c_low < a_end // C breaks below A's low

// === Final Condition ===
flat_pattern_confirmed = wave1_valid and wave_a_valid and wave_b_valid and wave_c_break

// === Plot + Alert ===
plotshape(flat_pattern_confirmed, title="Flat Wave 2 Detected", location=location.belowbar, color=color.red, style=shape.labelup, text="C↓")

alertcondition(flat_pattern_confirmed, title="Wave C Breaks Below A", message="Wave C broke below Wave A low — Flat correction confirmed, watch for Wave 3")