"""Original synthesized SFX. No samples or third-party audio. Reproducible PCM."""
from pathlib import Path
import math, random, struct, wave, json
ROOT = Path(__file__).resolve().parents[1]
OUT = ROOT / 'assets/audio'
RATE = 24000

def create(name, duration, tones=(), noise=0.0, decay=8, sweep=0.0):
    rng = random.Random(name)
    values = []
    low = 0.0
    for i in range(round(RATE * duration)):
        t = i / RATE
        env = min(1, t/.006) * min(1, (duration-t)/.035) * math.exp(-decay*t/duration)
        low = .72*low + .28*rng.uniform(-1,1)
        sample = noise * low
        for hz, weight, delay in tones:
            tt = max(0,t-delay)
            if t >= delay:
                sample += weight * math.sin(2*math.pi*(hz*tt+sweep*tt*tt)) * math.exp(-2*tt/duration)
        values.append(sample*env)
    peak = max(abs(x) for x in values) or 1
    pcm = b''.join(struct.pack('<h', round(x/peak*.55*32767)) for x in values)
    with wave.open(str(OUT / (name+'.wav')), 'wb') as f:
        f.setnchannels(1); f.setsampwidth(2); f.setframerate(RATE); f.writeframes(pcm)
    return {'id':name,'seconds':duration,'peak':.55,'sample_rate':RATE}

OUT.mkdir(parents=True, exist_ok=True)
specs = [
 ('place',.22,[(330,.5,0),(660,.3,.025)],.4,4,0),
 ('error',.20,[(135,.7,0)],.05,2,-80),
 ('stone',.24,[(92,.7,0),(181,.25,0)],1.6,6,-30),
 ('bolt',.22,[(540,.4,0),(1120,.2,0)],.8,5,-1200),
 ('mortar',.50,[(62,.6,0),(120,.25,0)],2.0,4,-25),
 ('ember',.24,[(390,.3,0),(780,.2,.04)],1.2,4,-240),
 ('ability',.65,[(330,.4,0),(440,.3,.08),(660,.25,.15)],.2,2,35),
 ('wave',.90,[(164.8,.5,0),(220,.3,.10),(329.6,.4,.20)],.1,2,0),
 ('boss',1.25,[(73.4,.6,0),(110,.4,.15),(146.8,.4,.28)],.4,1.6,0),
 ('settle',.65,[(392,.5,0),(523.25,.35,.12),(659.25,.3,.24)],.03,1.5,0),
 ('leak',.55,[(82.4,.65,0),(123.5,.3,.07)],.8,2,-28),
 ('victory',1.8,[(261.63,.4,0),(329.63,.3,.12),(392,.3,.24),(523.25,.4,.48)],.015,1.4,0),
 ('defeat',1.4,[(196,.45,0),(146.83,.4,.22),(98,.5,.42)],.02,1.5,0),
]
records = [create(*spec) for spec in specs]
(OUT/'manifest.json').write_text(json.dumps({'origin':'Original procedural synthesis; tools/generate_audio.py', 'clips':records}, indent=2)+'\n')
print(f'Generated {len(records)} original PCM effects.')