"""CFO-OS shared Odoo data layer (READ-ONLY).

Reuses the existing write-guarded client (ffs_dashboard/odoo_client.py) so there is
a single source of truth for the connection. Adds:
  - cached singleton client
  - read_group / search_read passthroughs with light cleanup
  - business constants (teams, excluded partners)
  - the "sales universe" base domain (confirmed orders, RI+FFS only)

NOTHING here writes to Odoo — the underlying client hard-blocks writes.
"""
import os
import sys
import queue as _queue
import threading
from concurrent.futures import ThreadPoolExecutor
from contextlib import contextmanager
from functools import lru_cache
from pathlib import Path

# Self-contained read-only client lives at the app root (platform/odoo_client.py) with its
# own .env — so this whole folder can be moved/hosted anywhere without external paths.
_ROOT = Path(__file__).resolve().parents[1]   # platform/
if str(_ROOT) not in sys.path:
    sys.path.insert(0, str(_ROOT))
from odoo_client import OdooClient  # noqa: E402  (read-only, write-guarded)

# ---- business constants (TENANT #0's scope, kept as module attributes for its modules) ----
# These are Royal Imports' config — the default a request gets when nothing binds a tenant.
# The canonical per-tenant home is `harness/tenants.py` Tenant.config; a BOUND tenant (see
# `tenant_scope` below) carries its own team ids / exclusions and never reads these.
TEAM_IDS = [5, 6]
TEAM_NAMES = {5: 'Fisch', 6: 'Royal'}
# Partners to exclude from analytics (not part of RI/FFS). Sourced from env so no
# customer name is ever hardcoded in the (potentially public) repo; set as a Space secret.
EXCLUDE_PARTNER_NAMES = {n.strip() for n in os.environ.get('EXCLUDE_PARTNER_NAMES', '').split(',') if n.strip()}

# Confirmed sale.order.line scope for RI+FFS (the analytics "sales universe").
# ⚠ Documentation of tenant #0's base scope — `sale_line_domain()` below BUILDS its domain from
# `active_team_ids()` (binding-aware) rather than reading this list; edit both or neither.
SALE_LINE_BASE = [
    ('state', 'in', ['sale', 'done']),
    ('order_id.team_id', 'in', TEAM_IDS),
    ('product_id', '!=', False),
]
# Posted customer invoices/credit notes (AR + revenue recognised).
INVOICE_BASE = [
    ('move_type', 'in', ['out_invoice', 'out_refund']),
    ('state', '=', 'posted'),
]


@lru_cache(maxsize=1)
def _global_client():
    """TENANT #0's read-only client (env/.env credentials) — the default for every unbound call."""
    return OdooClient()


# ---- per-tenant connections (R3 keychain cutover, 2026-08-04) --------------------------------
# One client per tenant slug, keyed by a fingerprint of its credentials so a rotated key
# reconnects on the next call with no restart. The DEFAULT slug maps to the env client above.
# ⛔ FAIL-CLOSED: a bound NON-default tenant with no credentials raises — the env fallback
# would silently answer tenant B's question over tenant A's connection, which is the exact
# failure this section exists to remove.
_DEFAULT_SLUG = 'royal-imports'
_TENANT_CLIENTS = {}            # slug -> (creds fingerprint, OdooClient)
_TC_LOCK = threading.Lock()


class TenantOdooUnavailable(RuntimeError):
    """A bound tenant has no Odoo credentials. Callers surface 'connect a source', never
    another tenant's data."""


def _client_for(slug, creds):
    """The client for a BOUND tenant. creds None: default slug -> env client; anyone else -> raise."""
    slug = str(slug or _DEFAULT_SLUG)
    if not creds:
        if slug == _DEFAULT_SLUG:
            return _global_client()
        raise TenantOdooUnavailable(
            f"tenant {slug!r} has no Odoo credentials — store them under Settings → Keychains. "
            f"(Refusing the environment fallback: that is another tenant's connection.)")
    fp = (str(creds.get('url') or ''), str(creds.get('db') or ''),
          str(creds.get('user') or ''), str(creds.get('api_key') or ''))
    with _TC_LOCK:
        cur = _TENANT_CLIENTS.get(slug)
        if cur and cur[0] == fp:
            return cur[1]
    cli = OdooClient(creds=creds)        # built OUTSIDE the lock: it authenticates over the wire
    with _TC_LOCK:
        cur = _TENANT_CLIENTS.get(slug)
        if cur and cur[0] == fp:
            return cur[1]                # another thread won the race — keep ONE client
        _TENANT_CLIENTS[slug] = (fp, cli)
    return cli


@contextmanager
def tenant_scope(slug, creds=None, team_ids=None, team_names=None, exclude_partner_names=None):
    """Bind THIS THREAD's Odoo context to a tenant: its connection + its scope constants.

    Unbound (the default) = tenant #0 via env, which is every existing Streamlit/API caller.
    The connector layer (harness/connectors/odoo.py) wraps each query in this, so a second
    tenant's keychain credentials reach the wire without any module knowing. Scope constants
    are PUSHED here from Tenant.config because core/ may not import harness/ (layering)."""
    prev = getattr(_tlocal, 'tenant_ctx', None)
    _tlocal.tenant_ctx = {
        'slug': str(slug or _DEFAULT_SLUG),
        'creds': creds,
        'team_ids': list(team_ids) if team_ids else None,
        'team_names': dict(team_names) if team_names else None,
        'exclude_partner_names': set(exclude_partner_names) if exclude_partner_names else None,
    }
    try:
        yield
    finally:
        _tlocal.tenant_ctx = prev


def _ctx():
    return getattr(_tlocal, 'tenant_ctx', None)


def active_team_ids():
    """The bound tenant's team ids; unbound or default slug -> tenant #0's TEAM_IDS."""
    c = _ctx()
    if c is not None and c['slug'] != _DEFAULT_SLUG:
        return list(c['team_ids'] or [])
    return list(TEAM_IDS)


def active_team_names():
    c = _ctx()
    if c is not None and c['slug'] != _DEFAULT_SLUG:
        return dict(c['team_names'] or {})
    return dict(TEAM_NAMES)


# ---- concurrent read pool -------------------------------------------------------------------
# Each Odoo XML-RPC call is a round-trip; a heavy drawer fires a dozen of them and they add up to
# many seconds when run one-by-one. `parallel()` runs independent READ tasks across a small pool of
# extra connections, with each task transparently using its own connection via a thread-local — so
# the existing read_group/search_read/sum_field helpers need no change. READ-ONLY only.
_POOL_MAX = 8
_tlocal = threading.local()
_pool_q = _queue.Queue()
_pool_n = 0
_pool_lock = threading.Lock()


def _checkout():
    global _pool_n
    try:
        return _pool_q.get_nowait()
    except _queue.Empty:
        with _pool_lock:
            grow = _pool_n < _POOL_MAX
            if grow:
                _pool_n += 1
        return OdooClient() if grow else _pool_q.get()   # else block until one frees


def _checkin(c):
    _pool_q.put(c)


def get_odoo():
    """The active read-only client, in priority order:
      1. a NON-default tenant binding (tenant_scope) — its own client, ALWAYS. The parallel()
         pool below holds tenant-#0 connections, so a pooled client must never answer a bound
         tenant's call (that is the cross-tenant leak R3's cutover removes);
      2. this task's pooled connection (parallel(), and the app's dedicated-bg-thread pattern);
      3. an explicit default-slug binding — the env client;
      4. unbound: the shared env singleton. Transparent to every read_group/... caller."""
    c = _ctx()
    if c is not None and c['slug'] != _DEFAULT_SLUG:
        return _client_for(c['slug'], c['creds'])
    task_client = getattr(_tlocal, 'client', None)
    if task_client is not None:
        return task_client
    if c is not None:
        return _client_for(c['slug'], c['creds'])
    return _global_client()


def set_doc_mode(mode):
    """Recognition basis for THIS thread's domain builds: 'order' (all confirmed orders) or 'invoice'
    (fully-invoiced orders only). Cached bundles call this before pulling; parallel() propagates it to
    each worker. Thread-local, so concurrent user sessions never race on each other's basis."""
    _tlocal.doc_mode = 'invoice' if mode == 'invoice' else 'order'


def doc_mode():
    return getattr(_tlocal, 'doc_mode', 'order')


def parallel(tasks):
    """Run independent zero-arg READ callables concurrently across the connection pool; returns
    results in order. Inside each task, get_odoo() (hence read_group/search_read/sum_field/
    search_count) uses that task's own connection. Never use for writes."""
    tasks = list(tasks)
    if not tasks:
        return []
    if len(tasks) == 1:
        return [tasks[0]()]

    caller_mode = doc_mode()                      # propagate the submitter's basis to each worker
    caller_ctx = _ctx()                           # and the tenant binding — a worker thread must
                                                  # answer for the SAME tenant as its submitter
    def _run(fn):
        c = _checkout()
        _tlocal.client = c
        _tlocal.doc_mode = caller_mode
        _tlocal.tenant_ctx = caller_ctx
        try:
            return fn()
        finally:
            _tlocal.client = None
            _tlocal.doc_mode = 'order'
            _tlocal.tenant_ctx = None
            _checkin(c)
    with ThreadPoolExecutor(max_workers=min(len(tasks), _POOL_MAX)) as ex:
        return list(ex.map(_run, tasks))


def parallel_map(task_dict):
    """parallel() over a {name: callable} mapping -> {name: result}."""
    keys = list(task_dict)
    return dict(zip(keys, parallel([task_dict[k] for k in keys])))


def m2o_id(v):
    return v[0] if isinstance(v, list) and v else None


def m2o_name(v):
    return v[1] if isinstance(v, list) and len(v) > 1 else ''


_EXCL_IDS = {}                  # slug -> tuple of excluded partner ids (resolved once per process)
_EXCL_LOCK = threading.Lock()


def excluded_partner_ids():
    """Resolve the ACTIVE tenant's excluded partner names to ids, for fast domain filtering.
    Cached per tenant slug — the old lru_cache(1) would have handed tenant B whatever tenant A
    resolved first. Unbound/default = tenant #0's env-sourced names; a bound tenant's names come
    from its scope config (none configured -> nothing excluded)."""
    c = _ctx()
    bound_other = c is not None and c['slug'] != _DEFAULT_SLUG
    slug = c['slug'] if bound_other else _DEFAULT_SLUG
    names = (c['exclude_partner_names'] or set()) if bound_other else EXCLUDE_PARTNER_NAMES
    with _EXCL_LOCK:
        if slug in _EXCL_IDS:
            return _EXCL_IDS[slug]
    if not names:
        res = tuple()
    else:
        rows = get_odoo().search_read('res.partner', [('name', 'in', list(names))], ['id'])
        res = tuple(r['id'] for r in rows)
    with _EXCL_LOCK:
        _EXCL_IDS[slug] = res
    return res


def sale_line_domain(date_from=None, date_to=None, team_id=None, extra=None, partner_ids=None):
    """Build a sale.order.line domain in the RI+FFS confirmed-order scope, excluding
    the configured house accounts, with optional date window / single team / extra clauses.
    partner_ids (a collection, possibly empty) restricts to those customers — the carrier for
    the Customer module's Agent filter; None = no partner restriction (an empty set matches none)."""
    tids = active_team_ids()
    dom = [('state', 'in', ['sale', 'done']), ('product_id', '!=', False)]
    if tids:
        dom.insert(1, ('order_id.team_id', 'in', tids))
    if team_id is not None:
        dom = [d for d in dom if not (isinstance(d, tuple) and d[0] == 'order_id.team_id')]
        dom.append(('order_id.team_id', '=', team_id))
    if date_from:
        dom.append(('order_id.date_order', '>=', f'{date_from} 00:00:00'))
    if date_to:
        dom.append(('order_id.date_order', '<=', f'{date_to} 23:59:59'))
    ex = excluded_partner_ids()
    if ex:
        dom.append(('order_partner_id', 'not in', list(ex)))
    if partner_ids is not None:
        dom.append(('order_partner_id', 'in', list(partner_ids)))
    if doc_mode() == 'invoice':
        dom.append(('order_id.invoice_status', '=', 'invoiced'))
    if extra:
        dom.extend(extra)
    return dom


def read_group(model, domain, fields, groupby, **kw):
    return get_odoo().read_group(model, domain=domain, fields=fields, groupby=groupby, **kw)


def search_read(model, domain=None, fields=None, **kw):
    return get_odoo().search_read(model, domain=domain or [], fields=fields or [], **kw)


def sum_field(model, domain, field):
    """One-line aggregate sum of `field` over a domain (uses read_group, no row fetch).

    Robust to the empty match set: a groupby=[] read_group over zero rows makes Odoo return a
    None aggregate, which the server's XML-RPC layer cannot marshal ("cannot marshal None").
    An empty set simply means the sum is 0.0, so we treat that specific Fault as zero."""
    try:
        g = get_odoo().read_group(model, domain=domain, fields=[f'{field}:sum'], groupby=[], lazy=False)
    except Exception as e:                       # noqa: BLE001 — narrow check below
        if 'cannot marshal None' in str(e):
            return 0.0
        raise
    return (g[0].get(field) or 0.0) if g else 0.0


def distinct_count(model, domain, field):
    """Distinct count of a (m2o) field over a domain via grouped read_group."""
    g = get_odoo().read_group(model, domain=domain, fields=[field], groupby=[field], lazy=False)
    return sum(1 for r in g if r.get(field))