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import numpy as np
import sounddevice as sd

# ======================
# Ljudinställningar
# ======================
SAMPLE_RATE = 44100
FREQ = 700        # Hz
VOLUME = 0.5

# ======================
# CW-funktioner
# ======================
def cw_tone(freq, duration_ms, volume=0.5):
    n = int(SAMPLE_RATE * duration_ms / 1000)
    t = np.arange(n) / SAMPLE_RATE

    # Fyrkantsvåg (klassisk CW)
    wave = np.sign(np.sin(2 * np.pi * freq * t))

    # Envelope (5 ms attack/release)
    env_len = int(SAMPLE_RATE * 0.005)
    envelope = np.ones(n)
    envelope[:env_len] = np.linspace(0, 1, env_len)
    envelope[-env_len:] = np.linspace(1, 0, env_len)

    return volume * wave * envelope


def silence(duration_ms):
    return np.zeros(int(SAMPLE_RATE * duration_ms / 1000))


# ======================
# Morse-timing (WPM ≈ 12)
# ======================
DIT_MS = 100
DAH_MS = 3 * DIT_MS
GAP_MS = DIT_MS
LETTER_GAP_MS = 3 * DIT_MS

DIT = cw_tone(FREQ, DIT_MS, VOLUME)
DAH = cw_tone(FREQ, DAH_MS, VOLUME)
GAP = silence(GAP_MS)
LETTER_GAP = silence(LETTER_GAP_MS)

# ======================
# SOS (... --- ...)
# ======================
TAIL = silence(200)   # 100 ms säkerhetsmarginal

sequence = np.concatenate([
    DIT, GAP, DIT, GAP, DIT,
    LETTER_GAP,
    DAH, GAP, DAH, GAP, DAH,
    LETTER_GAP,
    DIT, GAP, DIT, GAP, DIT,
    TAIL
])

# ======================
# Spela upp
# ======================
sd.play(sequence, SAMPLE_RATE)
sd.wait()