"""
backend/main.py — FastAPI entry point (S354: split in APIRouter modules).

Mappa dei router:
  api.conversations  → /api/conversations/**
  api.agent_memory   → /api/memory/agent/**
  api.files          → /api/files/**
  api.agent          → /api/agent/**, /api/reason/loop, /api/unified/loop, /run_loop
  api.exec           → /api/exec, /api/execute-shell, /api/pip-install, /api/agent/fix
  api.search         → /api/search, /api/fetch-page, /api/analyze-image
  api.providers      → /health, /api/tools, /api/status, /api/ai/health, /api/providers/heartbeat
  api.vault          → /api/vault/**
  api.webhook        → /api/webhook/**, /api/public/chat
  api.terminal       → /ws/terminal, GET /api/terminal/packages
  api.browser        → /api/browser/** (pre-esistente)
  api.coding         → /api/coding/** (pre-esistente)
  api.web            → /web/** (pre-esistente)
  api.mcp            → /api/mcp (P19-B3: MCP JSON-RPC 2.0 server)
"""
import os, time, logging, secrets as _secrets_mod
from fastapi import FastAPI, Request
from fastapi.staticfiles import StaticFiles
from fastapi.responses import JSONResponse

# Gap 2.2: Structured JSON logging — setup PRIMA di qualsiasi altro import
from api.structured_log import setup_structured_logging as _setup_structured_log, router as _logs_router
from api.integrity_manager import router as _integrity_router
from api.state import get_env_secret  # P41
_setup_structured_log()
import logging as _boot_logger; _boot_logger.getLogger('agente_ai').info('BOOT: importing FastAPI...')

app = FastAPI(title='Agente AI', version='3.6.0')
_logger = logging.getLogger('agente_ai')

# S274-SEC3: INTERNAL_TOKEN — genera casuale al boot se non configurato.
_GENERATED_TOKEN = _secrets_mod.token_hex(32)
if not get_env_secret('INTERNAL_TOKEN'):
    os.environ['INTERNAL_TOKEN'] = _GENERATED_TOKEN
    _logger.critical('BOOT: INTERNAL_TOKEN not set — ephemeral token generato per questa sessione.')
    _logger.critical('BOOT: Ogni restart cambia il token → CF Worker riceve 401 finché il secret non è aggiornato!')
    _logger.critical('BOOT: session token (copia in CF Workers secret INTERNAL_TOKEN): %r', _GENERATED_TOKEN)
    _logger.critical('BOOT: Fix — imposta INTERNAL_TOKEN uguale su HF Spaces e CF Workers secrets.')
else:
    _logger.info('BOOT: INTERNAL_TOKEN configurato OK')

# ── CORS — env-driven, Safari-safe ───────────────────────────────────────────
# ALLOWED_ORIGINS: comma-separated list, e.g. "https://agente-ai.vercel.app,http://localhost:5173"
# Supports wildcard suffix match (*.vercel.app, *.hf.space) for preview URLs.
_ALLOWED_ORIGINS_ENV = os.getenv('ALLOWED_ORIGINS', '')
# GAP-CORS-LOCALHOST-PROD: localhost vuoto in ENV=production
_ALWAYS_ALLOWED = (
    [] if os.getenv('ENV', 'dev') == 'production' else [
        'http://localhost:5173',
        'http://localhost:4173',
        'http://localhost:3000',
    ]
)
_VERCEL_PATTERNS = ['.vercel.app', '.vercel.sh', '.pages.dev']
_HF_PATTERNS     = ['.hf.space', '.huggingface.co']

def _build_origin_list() -> list[str]:
    origins = list(_ALWAYS_ALLOWED)
    if _ALLOWED_ORIGINS_ENV:
        for o in _ALLOWED_ORIGINS_ENV.split(','):
            o = o.strip()
            if o:
                origins.append(o)
    return origins

_STATIC_ORIGINS = _build_origin_list()

def _is_allowed_origin(origin: str | None) -> bool:
    if not origin:
        return False
    if origin in _STATIC_ORIGINS:
        _logger.info('CORS ALLOW (static): %s', origin)
        return True
    for pat in _VERCEL_PATTERNS + _HF_PATTERNS:
        if origin.endswith(pat):
            _logger.info('CORS ALLOW (pattern %s): %s', pat, origin)
            return True
    _logger.warning('CORS BLOCK: %s', origin)
    return False

# CORS NOTE (HF Spaces 2026-05-27): HF proxy auto-injects ACAO on all responses.
# This middleware handles preflight OPTIONS for Vercel frontend + documents allowed patterns.
_CORS_HEADERS = {
    'Access-Control-Allow-Methods':     'GET,POST,PUT,DELETE,OPTIONS,PATCH',
    'Access-Control-Allow-Headers':     '*',
    'Access-Control-Allow-Credentials': 'true',
    'Access-Control-Max-Age':           '3600',
    'Vary':                             'Origin',
}

@app.middleware('http')
async def _cors_middleware(request: Request, call_next):
    origin = request.headers.get('origin')
    if request.method == 'OPTIONS':
        if _is_allowed_origin(origin):
            return JSONResponse(content={}, status_code=204, headers={
                'Access-Control-Allow-Origin': origin,
                **_CORS_HEADERS,
            })
        return JSONResponse(content={}, status_code=204)
    response = await call_next(request)
    if _is_allowed_origin(origin):
        response.headers['Access-Control-Allow-Origin'] = origin
        for k, v in _CORS_HEADERS.items():
            response.headers[k] = v
    return response

@app.options('/{path:path}')
async def _preflight_fallback(path: str, request: Request):
    origin = request.headers.get('origin', '')
    if not _is_allowed_origin(origin):
        return JSONResponse(content={}, status_code=204)
    return JSONResponse(content={}, status_code=204, headers={
        'Access-Control-Allow-Origin':      origin,
        'Access-Control-Allow-Methods':     'GET,POST,PUT,DELETE,OPTIONS,PATCH',
        'Access-Control-Allow-Headers':     '*',
        'Access-Control-Allow-Credentials': 'true',
        'Access-Control-Max-Age':           '3600',
        'Vary':                             'Origin',
    })

# ── WARN-1 fix: body size hard limit — S292 ─────────────────────────────────
_MAX_BODY_BYTES = 512_000  # 512 KB — increased for PDF/vision content (V006)

@app.middleware('http')
async def _body_size_middleware(request: Request, call_next):
    cl = request.headers.get('content-length')
    if cl:
        try:
            if int(cl) > _MAX_BODY_BYTES:
                return JSONResponse(
                    {'detail': f'Payload troppo grande: max {_MAX_BODY_BYTES // 1024}KB. (R-S292)'},
                    status_code=413,
                )
        except ValueError:
            pass
    return await call_next(request)

# ── S477-SEC4: Rate limiting in-memory per IP ────────────────────────────────
# VITE_INTERNAL_TOKEN è visibile nel bundle JS → rate limiting come mitigazione
# pratica all'abuso (CF Worker proxy è il fix definitivo, non ancora implementato).
# 120 req/min globale per IP; OPTIONS exempt (preflight CORS non contano).
# In-memory: si resetta a ogni restart HF Space — accettabile su free tier.
_rl_store: dict[str, list[float]] = {}
_RL_WINDOW = 60.0
_RL_LIMIT  = 120  # req/minuto per IP

@app.middleware('http')
async def _rate_limit_middleware(request: Request, call_next):
    if request.method == "OPTIONS":
        return await call_next(request)
    ip = (request.client.host if request.client else None) or "unknown"
    now = time.monotonic()
    hits = [t for t in _rl_store.get(ip, []) if now - t < _RL_WINDOW]
    if len(hits) >= _RL_LIMIT:
        return JSONResponse(
            {"detail": "Too many requests"},
            status_code=429,
            headers={
                "X-RateLimit-Limit":     str(_RL_LIMIT),
                "X-RateLimit-Remaining": "0",
                "X-RateLimit-Reset":     str(int(now + _RL_WINDOW)),
                "Retry-After":           str(int(_RL_WINDOW)),
            },
        )
    hits.append(now)
    _rl_store[ip] = hits
    # S572: prune _rl_store ogni ~500 req — evita leak memoria con molti IP unici.
    # Rimuove IP con zero hit nella finestra (inattivi da > _RL_WINDOW secondi).
    if len(_rl_store) > 500:
        _cutoff = now - _RL_WINDOW
        _stale = [_k for _k, _v in list(_rl_store.items()) if not _v or _v[-1] < _cutoff]
        for _k in _stale:
            _rl_store.pop(_k, None)
    return await call_next(request)

# ── Include routers (S354 split) ─────────────────────────────────────────────
from api.conversations import router as _conv_router
from api.agent_memory   import router as _mem_router
from api.files          import router as _files_router
from api.agent          import router as _agent_router
from api.exec           import router as _exec_router
from api.search         import router as _search_router
from api.providers      import router as _providers_router
from api.vault          import router as _vault_router
from api.webhook        import router as _webhook_router
from api.terminal       import router as _terminal_router
from api.browser        import router as _browser_router
from api.coding         import router as _coding_router
from api.web            import router as _web_router
from api.vision         import router as _vision_router  # V001: generate_image / analyze_image / search_images
from api.gemini_vision  import router as _gemini_vision_router  # P48: Gemini 1.5 Flash Vision direct endpoint
from api.email          import router as _email_router   # V002: send_email via Resend API
from api.database       import router as _db_router       # V003: database_query PostgreSQL/SQLite
from api.research       import router as _research_router # V004: web_research multi-URL + Groq synthesis
from api.deploy         import router as _deploy_router    # S750: CI status + deploy trigger
from api.scheduler      import router as _scheduler_router, start_scheduler as _start_scheduler  # GAP-2.1: server-side persistent scheduler
from api.benchmark         import router as _benchmark_router   # S-BENCH: self-test endpoint /api/debug/benchmark
from api.telemetry         import router as _telemetry_router  # BG-3: timing metrics /api/telemetry
from api.agent_telemetry   import router as _agent_telemetry_router  # Gap N4: verdetti cross-session
from api.telegram_webhook  import router as _tg_webhook_router  # TG-BOT: riceve comandi bot + setup webhook
# notify_bot rimosso — Telegram gestito dal daemon Node.js
from api.incident_registry import router as _incident_router, start_incident_registry as _start_incident_reg  # GAP-A1
from api.decision_memory   import router as _decision_router, start_decision_memory as _start_decision_mem    # GAP-A2
from api.llm_cache         import router as _cache_router    # Gap 2.3: /api/cache/stats
from api.daemon_status     import router as _daemon_status_router  # DAEMON-STATUS: /api/daemon/status
from api.auth_guard        import AuthRole, require_role  # GAP-A6: importa per uso nei router
from api.blackboard        import router as _blackboard_router  # S-BB: shared blackboard cross-agent via Upstash
from api.state_sync         import router as _state_sync_router  # S901: UltraVSS Beta Strategy
from api.job_queue         import router as _jq_router            # S-DUAL-2: /api/jq/** Redis coordination
from agents.skill_tracker  import skill_router as _skill_tracker_router  # P17-B2: POST /skill-record + DELETE /skill-stats
from api.mcp               import router as _mcp_router               # P19-B3: MCP JSON-RPC 2.0 server
from api.ads_manager import router as _ads_router            # ADS-MANAGER: /api/ads/**
try:
    from service_handlers.semantic_memory_routes import router as _sem_mem_router  # S766-MEM
    _has_sem_mem = True
except ImportError:
    _has_sem_mem = False
from api.auth_managed      import router as _auth_managed_router         # P38: OAuth one-click connectors
# Doc2-1b-FIX: memory/sync router non era montato — endpoint /api/memory/sync/* non raggiungibili
# NOTA: create_memory_sync_router(memory) è una factory — richiede l'istanza MemoryManager.
# GAP-5-FIX: memory/sync router montato in _on_startup() (vedi sotto)

app.include_router(_auth_managed_router)  # P38: OAuth one-click
app.include_router(_conv_router)
app.include_router(_mem_router)
app.include_router(_files_router)
app.include_router(_agent_router)
app.include_router(_exec_router)
app.include_router(_search_router)
app.include_router(_providers_router)
app.include_router(_vault_router)
app.include_router(_webhook_router)
app.include_router(_terminal_router)
app.include_router(_browser_router)
app.include_router(_coding_router)
app.include_router(_web_router)
app.include_router(_vision_router)
app.include_router(_gemini_vision_router)  # P48: /api/vision/gemini + /api/vision/screenshot_analyze
app.include_router(_email_router)
app.include_router(_db_router)
app.include_router(_research_router)
app.include_router(_deploy_router)
app.include_router(_scheduler_router)   # GAP-2.1
app.include_router(_benchmark_router)    # S-BENCH: /api/debug/benchmark
app.include_router(_tg_webhook_router)   # TG-BOT: /api/telegram/webhook + /api/telegram/config/invalidate
app.include_router(_telemetry_router)    # BG-3: /api/telemetry
app.include_router(_agent_telemetry_router)  # Gap N4: /api/agent-telemetry/sync
app.include_router(_logs_router)          # Gap 2.2: /api/logs + /api/logs/frontend
app.include_router(_incident_router)     # GAP-A1: Incident Registry
app.include_router(_decision_router)     # GAP-A2: Decision Memory
app.include_router(_cache_router)        # Gap 2.3: /api/cache/stats
app.include_router(_daemon_status_router)  # DAEMON-STATUS: /api/daemon/status
app.include_router(_blackboard_router)       # S-BB: /api/blackboard/**
app.include_router(_state_sync_router)       # S901: /api/sync/**
app.include_router(_jq_router)                # S-DUAL-2: /api/jq/**
app.include_router(_integrity_router)         # P41: /api/integrity/**
if _skill_tracker_router is not None:
    app.include_router(_skill_tracker_router)    # P17-B2: /api/agent/skill-record + /api/agent/skill-stats (DELETE)
app.include_router(_mcp_router)                  # P19-B3: /api/mcp — MCP JSON-RPC 2.0
app.include_router(_ads_router)                  # ADS-MANAGER: /api/ads/**
if _has_sem_mem:
    app.include_router(_sem_mem_router)              # S766-MEM: /api/semantic-memory/**
# (memory/sync router montato in _on_startup)

# ── Startup: heartbeat + warmup ────────────────────────────────────────────────

import asyncio as _asyncio_main

def _log_task_exc(task: '_asyncio_main.Task[object]', name: str = '') -> None:
    """Done callback — loga eccezioni non gestite nei background task (P2)."""
    try:
        if not task.cancelled():
            exc = task.exception()
            if exc:
                _logger.error('BG task %r crashed: %s', name or task.get_name(), exc, exc_info=exc)
    except Exception:
        pass

@app.on_event('startup')
async def _on_startup():
    from api.providers import start_heartbeat
    start_heartbeat()
    _logger.info('BOOT: heartbeat started')
    # Master-Plan x5 — Fase 2.1: SPACE_ROLE gate
    # Solo SPACE_ROLE=brain (Space A arjanit98-terminal) avvia lo scheduler.
    # hands/memory saltano per evitare duplicati.
    _space_role = os.getenv('SPACE_ROLE', 'unknown')
    if _space_role in ('brain', 'unknown'):
        _start_scheduler()
        _logger.info('BOOT: scheduler avviato (SPACE_ROLE=%s)', _space_role)
    else:
        _logger.info('BOOT: scheduler SKIP — riservato a SPACE_ROLE=brain (nodo=%s)', _space_role)
    _start_incident_reg()     # GAP-A1: Incident Registry
    _start_decision_mem()     # GAP-A2: Decision Memory
    _logger.info('BOOT: core services (incident/decision) avviati')
    # S388: warmup TCP connection pools — inizializza i client Groq con 1 token
    # così la prima vera richiesta utente non paga il costo di handshake HTTP/TLS (~80ms per provider).
    # GAP-5-FIX: factory montata qui, DOPO _get_mem_manager_async() che garantisce
    # MemoryManager.init() completato prima che le richieste arrivino.
    try:
        from memory.sync import create_memory_sync_router as _create_sync_router
        from api.state import _get_mem_manager_async as _gmm_async
        _mem = await _gmm_async()
        if _mem is not None:
            _sync_router = _create_sync_router(_mem)
            app.include_router(_sync_router)
            _logger.info('BOOT: memory/sync router OK')
        else:
            _logger.info('BOOT: memory/sync router skip (manager None)')
    except Exception as _sync_err:
        _logger.warning('BOOT: memory/sync err — %s', _sync_err)
    import asyncio as _aio
    _t_wm = _aio.create_task(_startup_warmup())
    _t_wm.add_done_callback(lambda t: _log_task_exc(t, 'startup_warmup'))
    # GAP-STATE: ripristina _agent_tasks da Supabase snapshot + avvia bg persist
    try:
        from api.state import restore_agent_tasks_from_snap as _restore_snap, persist_state_snapshot as _snap_bg
        await _restore_snap()
        # GAP-2: crash-recovery — task zombi RUNNING vengono resettati a pending
        try:
            from api.state import _agent_tasks as _agt_cr
            _requeued = 0
            for _tid_cr, _td_cr in list(_agt_cr.items()):
                if _td_cr.get('_snap_restored') and _td_cr.get('status') in ('running', 'RUNNING'):
                    _td_cr['status'] = 'pending'
                    _td_cr['_crash_recovered'] = True
                    _requeued += 1
            if _requeued:
                _logger.info('BOOT GAP-2: %d task crash-recovered → status reset a pending', _requeued)
        except Exception as _cr_err:
            _logger.warning('BOOT GAP-2: crash-recover skip — %s', _cr_err)
        _t_snap = _aio.create_task(_snap_bg())
        _t_snap.add_done_callback(lambda t: _log_task_exc(t, 'snap_bg'))
        _logger.info('BOOT: GAP-STATE snapshot bg avviato')
    except Exception as _gstate_err:
        _logger.warning('BOOT: GAP-STATE skip — %s', _gstate_err)
    # NOTA: heartbeat Telegram rimosso — notifiche gestite dal daemon Node.js
    # GAP-NEW-5: telemetry alert loop — campiona ogni 5min, alert Telegram su soglie
    try:
        from api.telemetry import telemetry_alert_loop as _tel_alert
        _t_tel = _aio.create_task(_tel_alert())
        _t_tel.add_done_callback(lambda t: _log_task_exc(t, 'telemetry_alert_loop'))
        _logger.info('BOOT: telemetry alert loop avviato')
    except Exception as _tel_err:
        _logger.warning('BOOT: telemetry alert skip — %s', _tel_err)
    # S-DUAL-2: job queue consumer + load publisher
    try:
        from api.job_queue import start_job_queue_consumer as _start_jq
        _t_jq = _aio.create_task(_start_jq())
        _t_jq.add_done_callback(lambda t: _log_task_exc(t, 'job_queue_consumer'))
        _logger.info('BOOT: job queue consumer/publisher avviato (SPACE_ROLE=%s)', os.getenv('SPACE_ROLE', 'unknown'))
    except Exception as _jq_err:
        _logger.warning('BOOT: job queue consumer skip — %s', _jq_err)
    # S766-GRID-5: HeartbeatMonitor daemon D↔B — solo su SPACE_ROLE=brain/unknown
    if _space_role in ('brain', 'unknown'):
        try:
            from api.self_healing import get_heartbeat_monitor as _get_hbm
            _hbm = _get_hbm()
            await _hbm.start()
            _logger.info('BOOT: HeartbeatMonitor avviato — daemon D/B sotto controllo (S766-GRID-5)')
        except Exception as _hbm_err:
            _logger.warning('BOOT: HeartbeatMonitor skip — %s', _hbm_err)


async def _startup_warmup() -> None:
    """
    S388: Warmup dei provider Groq al boot.
    Spara 1 token a ogni slot Groq in parallelo — preinizializza i connection pool HTTP.
    Non blocca il boot, fallback silenzioso su qualsiasi errore.
    Attende 1s per permettere a FastAPI di completare il setup.
    """
    import asyncio as _aio
    await _aio.sleep(1)
    try:
        from api.state import _get_ai_client
        client = _get_ai_client()
        if not client or not client.providers:
            return
        # Warma solo gli slot Groq (veloci, <500ms) — non Gemini/OpenRouter
        groq_providers = [p for p in client.providers if p.name.startswith("groq")]
        if not groq_providers:
            return

        async def _warm_one(provider) -> None:
            try:
                c = client._client_for(provider)
                await _aio.wait_for(
                    _aio.to_thread(
                        c.chat.completions.create,
                        model=provider.default_model,
                        messages=[{"role": "user", "content": "hi"}],
                        max_tokens=1,
                        stream=False,
                    ),
                    timeout=5.0,
                )
                _logger.info('BOOT: warmup OK — %s (%s)', provider.name, provider.default_model.split('/')[-1][:24])
            except Exception as exc:
                _logger.warning('BOOT: warmup skip — %s: %s', provider.name, str(exc)[:60])

        await _aio.gather(*[_warm_one(p) for p in groq_providers])
    except Exception as exc:
        _logger.warning('BOOT: warmup failed: %s', exc)

    # P17-B4: pip pre-warm — importa i 20 moduli più usati dagli script sandbox
    # così la prima exec utente non paga il costo di import (~30-200ms/modulo).
    # Silenzioso: se non installato, skip.
    import importlib
    _PIP_PREWARM = [
        "numpy", "pandas", "matplotlib", "requests", "httpx",
        "json", "re", "os", "sys", "math",
        "datetime", "pathlib", "itertools", "functools", "collections",
        "typing", "dataclasses", "io", "base64", "hashlib",
    ]
    for _pkg in _PIP_PREWARM:
        try:
            importlib.import_module(_pkg)
        except Exception:
            pass
    _logger.info("BOOT: pip pre-warm %d modules done", len(_PIP_PREWARM))

# ── Frontend static (SPA) ──────────────────────────────────��───────────────────
_STATIC_DIR = os.getenv('FRONTEND_DIST', '/app/backend/static')
if os.path.isdir(_STATIC_DIR):
    app.mount('/', StaticFiles(directory=_STATIC_DIR, html=True), name='spa')
    _logger.info('BOOT: serving frontend from %s', _STATIC_DIR)
else:
    _logger.warning('BOOT: no frontend at %s', _STATIC_DIR)

_logger.info('BOOT: main.py v%s ready — %s routes registered ✓', app.version, len(app.routes))