"""Resumable eight-GPU generation directly into paired WebDataset TAR members.

Commands: init, worker, upload, status, seal. Authentication is read only from
HF_TOKEN by the upload process; neither credentials nor individual PNG files
are written to disk. SQLite publishes a shard only after its atomic close.
"""
import argparse
import hashlib
import io
import json
import os
from pathlib import Path
import sqlite3
import tarfile
import time
import traceback
from datetime import datetime, timezone

ROOT = Path(__file__).resolve().parents[1]
STATE = ROOT / 'experiments/background-production'
BUFFER = Path('/tmp/vivarium-background-production')
REPO = 'laion/Anim-E-Ghibli-Backgrounds-FLUX-9B'
BASE_REV = '32773329fbe7e81a90ef971740e8ba4b0364ecf3'
LORA_REV = '5bd654514cc35a1c0d0de878c3a514019896a44e'
LORA_SHA = '253dd23291a64514f7cb107714f2c20118efef930781d620a83417b441198982'
SOURCE_REV = '0c939cef5a586292950724b6500f10ffc5bfa24f'
NEGATIVE = 'people, human figures, characters, crowds, faces, readable text, lettering, logos, watermarks'

def utc():
    return datetime.now(timezone.utc).isoformat()

def dump(path, value):
    path = Path(path)
    path.parent.mkdir(parents=True, exist_ok=True)
    temp = path.with_name(path.name + '.tmp')
    temp.write_text(json.dumps(value, indent=2, ensure_ascii=False) + '\n')
    temp.replace(path)

def connect():
    STATE.mkdir(parents=True, exist_ok=True)
    con = sqlite3.connect(STATE / 'queue.sqlite', timeout=120)
    con.row_factory = sqlite3.Row
    con.execute('PRAGMA journal_mode=WAL')
    con.execute('PRAGMA busy_timeout=120000')
    return con

def init(plan):
    con = connect()
    con.executescript('''
      CREATE TABLE IF NOT EXISTS jobs (
        id TEXT PRIMARY KEY, position INTEGER, record TEXT NOT NULL,
        status TEXT NOT NULL DEFAULT 'queued', worker INTEGER, shard TEXT,
        generation_seconds REAL, metadata TEXT, started TEXT, finished TEXT);
      CREATE TABLE IF NOT EXISTS shards (
        name TEXT PRIMARY KEY, worker INTEGER, count INTEGER, bytes INTEGER,
        sha256 TEXT, status TEXT, revision TEXT, created TEXT, uploaded TEXT);
      CREATE TABLE IF NOT EXISTS settings (key TEXT PRIMARY KEY, value TEXT);
      CREATE TABLE IF NOT EXISTS events (time TEXT, worker INTEGER, kind TEXT, detail TEXT);
    ''')
    records = json.loads(Path(plan).read_text())
    for pos, record in enumerate(records):
        prior = con.execute('SELECT record FROM jobs WHERE id=?', (record['id'],)).fetchone()
        serialized = json.dumps(record, ensure_ascii=False, sort_keys=True)
        if prior and prior['record'] != serialized:
            raise ValueError('Refusing to mutate an already queued prompt: ' + record['id'])
        con.execute('INSERT OR IGNORE INTO jobs(id,position,record) VALUES(?,?,?)',
                    (record['id'], pos, serialized))
    con.commit()
    print(json.dumps(status(con)), flush=True)

def event(con, worker, kind, detail=''):
    con.execute('INSERT INTO events VALUES(?,?,?,?)', (utc(), worker, kind, detail))
    con.commit()

def claim(con, worker):
    con.execute('BEGIN IMMEDIATE')
    row = con.execute("SELECT * FROM jobs WHERE status='queued' ORDER BY position LIMIT 1").fetchone()
    if row:
        con.execute("UPDATE jobs SET status='running',worker=?,started=? WHERE id=?", (worker, utc(), row['id']))
    con.commit()
    return json.loads(row['record']) if row else None

def sealed(con):
    row = con.execute("SELECT value FROM settings WHERE key='sealed'").fetchone()
    return bool(row and row['value'] == 'true')

def add_member(tar, name, data):
    info = tarfile.TarInfo(name)
    info.size = len(data)
    info.mtime = 0
    info.mode = 0o644
    tar.addfile(info, io.BytesIO(data))

def sha(path):
    h = hashlib.sha256()
    with open(path, 'rb') as f:
        for block in iter(lambda: f.read(8 << 20), b''):
            h.update(block)
    return h.hexdigest()

def worker(gpu, chunk):
    import torch
    import diffusers
    import transformers
    from native_flux_inference import create_native_pipeline, generate_native_image
    con = connect()
    # Restarting a worker safely regenerates only its uncommitted partial shard.
    con.execute("UPDATE jobs SET status='queued',worker=NULL WHERE status='running' AND worker=?", (gpu,))
    con.commit()
    event(con, gpu, 'loading')
    start = time.perf_counter()
    pipe = create_native_pipeline('backgrounds', device='cuda:0', compile_mode='default', cfg_mode='batched')
    load_seconds = time.perf_counter() - start
    event(con, gpu, 'loaded', json.dumps(dict(seconds=load_seconds, gpu=torch.cuda.get_device_name(0))))
    existing = list(BUFFER.glob(f'train-g{gpu}-*.tar'))
    sequence = max([int(p.stem.rsplit('-', 1)[1]) for p in existing] + [-1]) + 1
    # Include remotely uploaded/deleted shards when resuming.
    rows = con.execute('SELECT name FROM shards WHERE worker=?', (gpu,)).fetchall()
    sequence = max(sequence, max([int(r['name'].removesuffix('.tar').rsplit('-', 1)[1]) for r in rows] + [-1]) + 1)
    BUFFER.mkdir(parents=True, exist_ok=True)
    first = not rows
    while True:
        samples = []
        tar = None
        target = chunk if not first else 2
        for _ in range(target):
            record = claim(con, gpu)
            if record is None:
                if samples or sealed(con):
                    break
                time.sleep(3)
                continue
            if tar is None:
                name = f'train-g{gpu}-{sequence:05d}.tar'
                partial = BUFFER / (name + '.partial')
                final = BUFFER / name
                tar = tarfile.open(partial, 'w', format=tarfile.USTAR_FORMAT)
            torch.cuda.synchronize()
            begin = time.perf_counter()
            try:
                image = generate_native_image(pipe, prompt=record['prompt'], seed=record['seed'],
                    steps=50, guidance=4., negative_prompt=record['negative_prompt'], width=1376, height=768)[0]
                torch.cuda.synchronize()
                generation_seconds = time.perf_counter() - begin
                encoded = io.BytesIO()
                image.save(encoded, format='PNG', compress_level=4)
                image_bytes = encoded.getvalue()
                metadata = dict(record)
                metadata.update(dict(
                    schema_version='1.0', generated_utc=utc(), image_sha256=hashlib.sha256(image_bytes).hexdigest(),
                    inference=dict(model='black-forest-labs/FLUX.2-klein-base-9B', revision=BASE_REV,
                        lora='laion/FLUX.2-klein-base-9B-vivarium-loras', lora_revision=LORA_REV,
                        lora_subfolder='backgrounds', lora_sha256=LORA_SHA, lora_rank=64, lora_alpha=64,
                        lora_training_step=2000, lora_scale=1.0, steps=50, guidance_scale=4.0,
                        seed=record['seed'], width=1376, height=768, dtype='bfloat16', quantization=False,
                        distillation=False, max_sequence_length=256, cfg_mode='batched', lora_fused=True,
                        qkv_fused=True, compile_mode='default', compile_fullgraph=False,
                        compile_dynamic=True, negative_embedding_cached=True,
                        scheduler=type(pipe.scheduler).__name__, scheduler_config=dict(pipe.scheduler.config),
                        reference_images=[]),
                    runtime=dict(gpu_index=gpu, gpu=torch.cuda.get_device_name(0), batch_size=1,
                        generation_seconds=generation_seconds, includes_compile_warmup=first and not samples,
                        model_load_seconds=load_seconds, torch=torch.__version__, cuda=torch.version.cuda,
                        diffusers=diffusers.__version__, transformers=transformers.__version__,
                        diffusers_commit='899c9f3fd0e64f3206781c00c71c28249eff9ca5'),
                    storage=dict(shard=name, image_member=record['id']+'.png', json_member=record['id']+'.json',
                        prompt_member=record['id']+'.txt', encoding='PNG RGB', png_compress_level=4)))
                add_member(tar, record['id']+'.png', image_bytes)
                add_member(tar, record['id']+'.json', json.dumps(metadata, ensure_ascii=False, indent=2).encode())
                add_member(tar, record['id']+'.txt', record['prompt'].encode())
                samples.append((record['id'], generation_seconds, json.dumps(metadata, ensure_ascii=False)))
                event(con, gpu, 'image', json.dumps(dict(id=record['id'], seconds=generation_seconds)))
                print(json.dumps(dict(gpu=gpu, id=record['id'], seconds=round(generation_seconds, 2))), flush=True)
            except Exception:
                event(con, gpu, 'error', traceback.format_exc())
                raise
        if tar:
            tar.close()
            partial.replace(final)
            digest = sha(final)
            con.execute('BEGIN IMMEDIATE')
            con.execute('INSERT INTO shards VALUES(?,?,?,?,?,?,?,?,?)',
                (name, gpu, len(samples), final.stat().st_size, digest, 'ready', None, utc(), None))
            for ident, seconds, metadata in samples:
                con.execute("UPDATE jobs SET status='done',shard=?,generation_seconds=?,metadata=?,finished=? WHERE id=?",
                    (name, seconds, metadata, utc(), ident))
            con.commit()
            event(con, gpu, 'shard', name)
            sequence += 1
            first = False
        if not samples and sealed(con):
            break
    event(con, gpu, 'complete')
    print('Worker complete', gpu, flush=True)

def status(con=None):
    con = con or connect()
    jobs = {r[0]:r[1] for r in con.execute('SELECT status,COUNT(*) FROM jobs GROUP BY status')}
    shards = {r[0]:r[1] for r in con.execute('SELECT status,COUNT(*) FROM shards GROUP BY status')}
    open_images=con.execute("""SELECT COUNT(DISTINCT j.id) FROM jobs j JOIN events e
      ON e.kind='image' AND json_extract(e.detail,'$.id')=j.id
      WHERE j.status='running' AND e.time>=j.started""").fetchone()[0]
    generated=jobs.get('done',0)+open_images
    seconds=con.execute("""SELECT AVG(seconds) FROM (
      SELECT json_extract(detail,'$.seconds') AS seconds,
      ROW_NUMBER() OVER (PARTITION BY worker ORDER BY rowid) AS sequence
      FROM events WHERE kind='image') WHERE sequence>1""").fetchone()[0]
    return dict(utc=utc(), jobs=jobs, shards=shards, sealed=sealed(con), steady_mean_seconds=seconds,
                images_generated=generated, images_in_open_shards=open_images,
                images_currently_generating=jobs.get('running',0)-open_images,
                inference_attempts_completed=con.execute("SELECT COUNT(*) FROM events WHERE kind='image'").fetchone()[0],
                buffer_free_gb=os.statvfs(BUFFER if BUFFER.exists() else '/tmp').f_bavail * os.statvfs('/tmp').f_frsize / 1e9)

def upload(delete_after=False):
    from huggingface_hub import HfApi
    token = os.environ.get('HF_TOKEN')
    if not token:
        raise RuntimeError('HF_TOKEN must be supplied only through the process environment')
    api = HfApi(token=token)
    con = connect()
    while True:
        # First 16 production images are reviewed as contact sheets before
        # allowing any image publication. Other workers continue generating.
        if not (STATE / 'quality-gate-passed.json').is_file():
            time.sleep(5)
            continue
        rows = con.execute("SELECT * FROM shards WHERE status='ready' ORDER BY created").fetchall()
        for row in rows:
            local = BUFFER / row['name']
            try:
                if sha(local) != row['sha256']:
                    raise ValueError('Local shard checksum mismatch: ' + row['name'])
                result = api.upload_file(path_or_fileobj=local, path_in_repo='data/'+row['name'],
                    repo_id=REPO, repo_type='dataset', commit_message=f"Add {row['count']} backgrounds: {row['name']}")
                remote = api.dataset_info(REPO, revision=result.oid, files_metadata=True)
                file = next(f for f in remote.siblings if f.rfilename == 'data/'+row['name'])
                remote_digest = file.lfs.sha256 if file.lfs else None
                if file.size != row['bytes'] or remote_digest != row['sha256']:
                    raise ValueError('Remote size/SHA256 mismatch: ' + row['name'])
                con.execute("UPDATE shards SET status='uploaded',revision=?,uploaded=? WHERE name=?", (result.oid, utc(), row['name']))
                con.commit()
                event(con, -1, 'uploaded', json.dumps(dict(name=row['name'], revision=result.oid)))
                print(json.dumps(dict(uploaded=row['name'], images=row['count'], revision=result.oid)), flush=True)
                # Only verified remote content is eligible for local removal.
                free = os.statvfs(BUFFER).f_bavail * os.statvfs(BUFFER).f_frsize
                if delete_after or free < 30_000_000_000:
                    local.unlink()
                    event(con, -1, 'buffer_deleted', row['name'])
            except Exception as exc:
                event(con, -1, 'upload_error', str(exc))
                print('Upload will retry:', type(exc).__name__, str(exc), flush=True)
                time.sleep(10)
        state = status(con)
        dump(STATE / 'progress.json', state)
        unfinished = con.execute("SELECT COUNT(*) FROM jobs WHERE status!='done'").fetchone()[0]
        unuploaded = con.execute("SELECT COUNT(*) FROM shards WHERE status!='uploaded'").fetchone()[0]
        if sealed(con) and not unfinished and not unuploaded:
            print('All generated shards uploaded and checksummed', flush=True)
            return
        time.sleep(5)

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    sub = parser.add_subparsers(dest='command', required=True)
    ini = sub.add_parser('init'); ini.add_argument('plan', type=Path)
    wor = sub.add_parser('worker'); wor.add_argument('--gpu', type=int, required=True); wor.add_argument('--chunk', type=int, default=24)
    up = sub.add_parser('upload'); up.add_argument('--delete-after', action='store_true')
    sub.add_parser('status'); sub.add_parser('seal')
    args = parser.parse_args()
    if args.command == 'init': init(args.plan)
    elif args.command == 'worker': worker(args.gpu, args.chunk)
    elif args.command == 'upload': upload(args.delete_after)
    elif args.command == 'status': print(json.dumps(status(), indent=2))
    elif args.command == 'seal':
        con=connect(); con.execute("INSERT OR REPLACE INTO settings VALUES('sealed','true')"); con.commit()