"""The policy's view of a person (Principal) and of a packet (PacketState)."""

from __future__ import annotations

from collections.abc import Iterable, Mapping
from dataclasses import dataclass, field
from types import MappingProxyType

from ..auth.groups import SHOP_LEVELS, parse_role

SUPPORT = ("CL", "WH", "QC")
LEVELS: dict[str, int] = {level: i + 1 for i, level in enumerate(SHOP_LEVELS)}  # worker 1, lead 2, supervisor 3


@dataclass(frozen=True)
class Principal:
    user_id: str | None  # uuid as text; None for system
    admin: bool = False
    support: frozenset[str] = frozenset()  # codes among CL, WH, QC the user is a member of (any level)
    support_sup: frozenset[str] = frozenset()  # codes among CL, WH, QC where the user is Supervisor
    shop: Mapping[str, int] = field(default_factory=lambda: MappingProxyType({}))  # code -> 1 worker, 2 lead, 3 sup
    station_limits: frozenset[int] = frozenset()  # station ids a worker is limited to; empty = any
    pm: bool = False
    session_kind: str = "password"  # password | pin
    system: str | None = None  # "visual-feed" for the worker; never from a session

    def level(self, dept: str) -> int:
        """Shop level in a department: 0 none, 1 worker, 2 lead, 3 supervisor."""
        return int(self.shop.get(dept, 0))


@dataclass(frozen=True)
class PacketState:
    id: int
    status: str  # packet_status value
    dept: str  # dept_code
    station_id: int | None
    welder_id: str | None  # uuid text of the assigned welder
    wh_skipped: bool
    routed_to: str | None  # databook | shipping | None
    vclosed: bool
    removed: bool
    source_kind: str  # visual | hand
    weld_dept: bool  # departments.weld
    co_hold: bool  # an approved CO with pending verifications, or a pending CO with hold=true
    co_hold_why: str = ""  # text for the error
    open_shorts: int = 0
    drawing_attached: bool = False
    heat_map: bool | None = None
    bom_total: int = 0  # lines not marked n/a
    bom_ready: int = 0  # lines pulled, or with an open short
    bom_missing_heat: int = 0  # pulled lines with pieces issued and no heat (not n/a, not a sub-assembly)
    welds: int = 0
    checklist_complete: bool = False  # every key of the department checklist is done (empty list is complete)
    filler_set: bool = False
    qc_missing: tuple[str, ...] = ()  # the old qcMissing() list, computed by the read model
    has_qc_sent: bool = False  # qc_inspections row exists for the current stage
    shorts_unapproved: int = 0  # open shorts plus received shorts the supervisor has not approved (C7)
    itp_open: bool = False  # the packet's unit has an ITP that is not complete (C3)
    ncr_required: bool = False  # a Q.C. reject since the last accept has no NCR number (C2)
    visual_open_wos: tuple[str, ...] = ()  # the work orders the feed last saw open in VISUAL (C5)


SYSTEM_FEED = Principal(user_id=None, system="visual-feed")


def principal_from_roles(
    user_id: str | None,
    roles: Iterable[str],
    station_limits: Iterable[int] = (),
    session_kind: str = "password",
) -> Principal:
    """Build the policy Principal from phase 1 role strings. A role that does not parse is ignored."""
    admin = False
    pm = False
    support: set[str] = set()
    support_sup: set[str] = set()
    shop: dict[str, int] = {}
    for text in roles:
        try:
            role = parse_role(text)
        except ValueError:
            continue
        if role.kind == "admin":
            admin = True
        elif role.kind == "pm":
            pm = True
        elif role.kind.startswith("shop_") and role.dept_code:
            level = LEVELS[role.kind.removeprefix("shop_")]
            shop[role.dept_code] = max(level, shop.get(role.dept_code, 0))
        elif role.dept_code in SUPPORT:
            support.add(role.dept_code)
            if role.kind.endswith("_supervisor"):
                support_sup.add(role.dept_code)
    return Principal(
        user_id=user_id,
        admin=admin,
        support=frozenset(support),
        support_sup=frozenset(support_sup),
        shop=MappingProxyType(shop),
        station_limits=frozenset(int(s) for s in station_limits),
        pm=pm,
        session_kind=session_kind,
    )