"""I DROWNED MOBY-DICK: deterministic erasure + offline participatory instrument.
No network, credentials, account, signature, tracking, package install or deployment.
Python 3.10+ standard library. Original code: Grouper, MIT; Melville prose public domain (US).
"""
from pathlib import Path
import argparse, hashlib, html, json, re, bisect, zipfile, datetime
D=Path(__file__).resolve().parent
CA='0x3eb2984a7eF1C2E33f2D919DB775B0f6E190FE16'
URL='https://midaswhale.wtf/USDG/'
WET={'sea','seas','ocean','oceans','water','waters','whale','whales','fish','fishes','swim','swam','swimming','gills','tide','tides','wave','waves','deep','depths','drowned','drowning','salt','foam','surf','current','currents'}
def prepare(raw,seed=4663):
    body=raw.split('*** START OF THE PROJECT GUTENBERG EBOOK',1)[1].split('***',1)[1].split('*** END OF THE PROJECT GUTENBERG EBOOK',1)[0].strip()
    # Remove contents/front matter: the final CHAPTER 1 marker is the narrative's start.
    starts=list(re.finditer(r'(?m)^CHAPTER 1\. Loomings\.',body));assert len(starts)==2
    body=body[starts[-1].start():]
    assert body.count('Call me Ishmael.')==1 and 'Project Gutenberg' not in body
    tokens=body.split(); n=len(tokens)
    anchors=[i for i,w in enumerate(tokens) if re.sub('[^a-z]','',w.lower()) in WET]
    assert anchors
    dist=[];j=0
    for i in range(n):
        while j+1<len(anchors) and abs(anchors[j+1]-i)<abs(anchors[j]-i):j+=1
        dist.append(abs(anchors[j]-i))
    def tie(i):return ((i ^ seed)*2654435761 & 0xffffffff)
    wet=sorted(range(n),key=lambda i:(dist[i],tie(i),i))
    dry=sorted(range(n),key=lambda i:(-dist[i],tie(i),i))
    ranks={}
    for name,order in [('fish',wet),('land',dry)]:
        ranks[name]=[0]*n
        for rank,i in enumerate(order):ranks[name][i]=rank
    chapters=[]
    for m in re.finditer(r'(?m)^(CHAPTER \d+\.[^\n]*|Epilogue\.?)[ \t]*$',body):
        chapters.append({'title':m.group(1),'start':len(body[:m.start()].split())})
    if len(chapters)<100:raise ValueError('Chapter extraction failed')
    return tokens,ranks,chapters,anchors

def generate(seed=4663):
    raw=(D/'moby-dick-source.txt').read_text(encoding='utf-8-sig');tokens,ranks,chapters,anchors=prepare(raw,seed)
    selected=[i for i in range(len(tokens)) if ranks['fish'][i]<50000]
    text=' '.join(tokens[i] for i in selected)+'\n'
    (D/'drowned-50000.txt').write_text(text,encoding='utf-8')
    payload=json.dumps({'bookId':hashlib.sha256(' '.join(tokens).encode('utf-8')).hexdigest(),'tokens':tokens,'ranks':ranks,'chapters':chapters,'seed':seed},ensure_ascii=False,separators=(',',':')).replace('<','\\u003c')
    template=(D/'instrument.template.html').read_text(encoding='utf-8')
    artifact=template.replace('__BOOK_DATA__',payload).replace('__TOKEN_CA__',CA).replace('__ORIGINAL_URL__',URL)
    (D/'DROWN-MOBY-DICK.html').write_text(artifact,encoding='utf-8')
    meta={'builtAt':datetime.datetime.now(datetime.timezone.utc).isoformat(),'title':'I DROWNED MOBY-DICK','author':'Grouper / UpsideDownGrouper','sourceAuthor':'Herman Melville','source':'https://www.gutenberg.org/ebooks/2701','sourceDownload':'https://www.gutenberg.org/ebooks/2701.txt.utf-8','sourceSHA256':hashlib.sha256((D/'moby-dick-source.txt').read_bytes()).hexdigest(),'sourceNarrativeWhitespaceTokens':len(tokens),'wetAnchors':len(anchors),'chapters':len(chapters),'generatedWhitespaceTokens':len(text.split()),'uniqueSourceIndices':len(set(selected)),'method':'All source tokens ranked by nearest wet-vocabulary token, deterministic seeded tie-break; select 50000 distinct source positions, restore original order. No invented Melville prose. LAND reverses distance priority. Tide changes retained count. Lifeboat preserves at most twelve chosen word occurrences.','seed':seed,'publicStatus':'LOCAL_TEST_ARTIFACT_NOT_PUBLISHED_NOT_ENTERED','audienceEvidence':None,'cashSpendUSD':'0','signatures':0,'siteEdited':False}
    meta['artifacts']={name:{'bytes':(D/name).stat().st_size,'sha256':hashlib.sha256((D/name).read_bytes()).hexdigest()} for name in ['DROWN-MOBY-DICK.html','drowned-50000.txt','build_drowned_book.py','instrument.template.html']}
    (D/'build-manifest.json').write_text(json.dumps(meta,indent=2),encoding='utf-8')
    with zipfile.ZipFile(D/'drowned-book-kit.zip','w',zipfile.ZIP_DEFLATED) as z:
        for name in ['DROWN-MOBY-DICK.html','drowned-50000.txt','build_drowned_book.py','instrument.template.html','build-manifest.json','README.txt','LICENSE.txt','moby-dick-source.txt','test_drowned_book.py']:
            z.write(D/name,arcname=name)
    return meta
if __name__=='__main__':
    p=argparse.ArgumentParser();p.add_argument('--seed',type=int,default=4663);a=p.parse_args();print(json.dumps(generate(a.seed),indent=2))