"""The packet read model, the policy's PacketState, and the board cards.

`read_packet` is the full answer of GET /api/packets/{id} and of every packet mutation. `packet_state` builds the
policy's view from the same child rows, so a write and a read decide from the same facts. `list_cards` serves the
boards from header columns, v_open_cos and the open short count only.
"""

from __future__ import annotations

import uuid
from collections.abc import Iterable, Mapping
from dataclasses import dataclass, field
from typing import Any

from psycopg.rows import dict_row

from .. import policy
from ..api import deps
from ..api.errors import ApiError
from . import checklists

HAND_FLAG = "Made by hand - check it and send it on"
DRAWING_NEEDED_FLAG = "Drawing needed - looking it up in the vault"
DRAWING_STATES_ATTACHED = ("attached", "hand")

# Keys left out of the sealed content: they change without the packet changing (who can do what, the counter,
# the seal itself, the data book export date) or come from code and AD rather than the packet (checklist texts,
# the flag, the unit and project names, display names).
SEAL_EXCLUDE = (
    "can",
    "blocked",
    "holder",
    "version",
    "log",
    "seal",
    "databook_at",
    "checklist_items",
    "qc_items",
    "flag",
)


# ---------------------------------------------------------------- small helpers


def rows(conn: Any, query: str, params: Any = ()) -> list[dict[str, Any]]:
    with conn.cursor(row_factory=dict_row) as cur:
        return list(cur.execute(query, params).fetchall())


def one(conn: Any, query: str, params: Any = ()) -> dict[str, Any] | None:
    with conn.cursor(row_factory=dict_row) as cur:
        r = cur.execute(query, params).fetchone()
    return dict(r) if r is not None else None


def uid_text(value: Any) -> str | None:
    return None if value is None else str(value)


def load_row(conn: Any, packet_id: int, *, lock: bool = False) -> dict[str, Any] | None:
    """The packets row, or None. With lock=True it is taken FOR UPDATE (inside a transaction)."""
    sql = "SELECT *, status::text AS status, source_kind::text AS source_kind, routed_to::text AS routed_to,"
    sql += " drawing_state::text AS drawing_state FROM packets WHERE id = %s"
    if lock:
        sql += " FOR UPDATE"
    return one(conn, sql, (packet_id,))


def flag_of(status: str, source_kind: str, flags: Iterable[str] | None, drawing_state: str | None = None) -> str | None:
    """The draft flag shown on cards and the packet page. The old packetFlag(), phase 2 part."""
    if status != "draft":
        return None
    if source_kind == "hand":
        return HAND_FLAG
    if "drawing_needed" in (flags or ()):
        return DRAWING_NEEDED_FLAG
    return None


# SQL for the same rule, for the list filter.
FLAG_SQL = "(p.status = 'draft' AND (p.source_kind = 'hand' OR 'drawing_needed' = ANY(p.flags)))"


def policy_principal_for(conn: Any, p: deps.Principal) -> policy.Principal:
    """The policy Principal for a session: its roles, the user's station limits and the session kind."""
    limits = [r[0] for r in conn.execute("SELECT station_id FROM user_station_limits WHERE user_id = %s", (p.user_id,))]
    return policy.principal_from_roles(str(p.user_id), p.roles, station_limits=limits, session_kind=p.kind)


def co_hold_why(open_cos: Iterable[Mapping[str, Any]], dept_names: Mapping[str, str]) -> str:
    parts: list[str] = []
    for co in open_cos:
        if str(co.get("review")) == "pending":
            parts.append(f"Change order {co['co_no']} is on hold.")
        else:
            names = ", ".join(dept_names.get(c, c) for c in co.get("pending_depts") or [])
            parts.append(f"Change order {co['co_no']} is waiting for verification by {names}.")
    return " ".join(parts)


def dept_names(conn: Any) -> dict[str, str]:
    return {r[0]: r[1] for r in conn.execute("SELECT code, name FROM departments")}


# ---------------------------------------------------------------- the child rows


@dataclass
class Children:
    dept: dict[str, Any]
    station: dict[str, Any] | None
    work_orders: list[dict[str, Any]] = field(default_factory=list)
    pages: list[dict[str, Any]] = field(default_factory=list)
    bom: list[dict[str, Any]] = field(default_factory=list)
    shorts: dict[int, dict[str, Any]] = field(default_factory=dict)  # bom_line_id -> open short
    receipts: dict[int, list[dict[str, Any]]] = field(default_factory=dict)  # short id -> receipts
    welds: list[dict[str, Any]] = field(default_factory=list)
    heat_tags: list[dict[str, Any]] = field(default_factory=list)
    heat_table: list[dict[str, Any]] = field(default_factory=list)
    stages: list[dict[str, Any]] = field(default_factory=list)
    wh: dict[str, Any] | None = None
    qc: dict[str, Any] | None = None
    qc_history: list[dict[str, Any]] = field(default_factory=list)
    change_orders: list[dict[str, Any]] = field(default_factory=list)
    co_items: dict[int, list[dict[str, Any]]] = field(default_factory=dict)
    co_required: dict[int, list[str]] = field(default_factory=dict)
    co_verified: dict[int, list[dict[str, Any]]] = field(default_factory=dict)
    open_cos: list[dict[str, Any]] = field(default_factory=list)
    docs: list[dict[str, Any]] = field(default_factory=list)
    seal: dict[str, Any] | None = None
    dept_names: dict[str, str] = field(default_factory=dict)

    @property
    def open_stage(self) -> dict[str, Any] | None:
        return next((s for s in self.stages if s["closed_at"] is None), None)


def load_children(conn: Any, row: Mapping[str, Any], *, full: bool = True) -> Children:
    """Every child row the read model and the policy need. full=False skips what only the read model shows."""
    pid = row["id"]
    dept = one(conn, "SELECT code, name, weld FROM departments WHERE code = %s", (row["dept_code"],)) or {
        "code": row["dept_code"],
        "name": row["dept_code"],
        "weld": False,
    }
    station = (
        one(conn, "SELECT id, name FROM stations WHERE id = %s", (row["station_id"],)) if row["station_id"] else None
    )
    ch = Children(dept=dept, station=station)
    ch.dept_names = dept_names(conn)
    ch.pages = rows(conn, "SELECT * FROM packet_pages WHERE packet_id = %s ORDER BY n", (pid,))
    ch.bom = rows(conn, "SELECT * FROM bom_lines WHERE packet_id = %s ORDER BY item", (pid,))
    shorts = rows(conn, "SELECT * FROM bom_shorts WHERE packet_id = %s AND closed_at IS NULL", (pid,))
    ch.shorts = {s["bom_line_id"]: s for s in shorts}
    ch.welds = rows(conn, "SELECT * FROM welds WHERE packet_id = %s AND removed_at IS NULL ORDER BY weld_no", (pid,))
    ch.stages = rows(conn, "SELECT * FROM packet_stages WHERE packet_id = %s ORDER BY id", (pid,))
    ch.qc = one(conn, "SELECT * FROM qc_inspections WHERE packet_id = %s AND closed_at IS NULL", (pid,))
    ch.open_cos = rows(
        conn,
        "SELECT co_id, co_no, review::text AS review, hold, pending_depts FROM v_open_cos WHERE packet_id = %s"
        " ORDER BY co_no",
        (pid,),
    )
    if not full:
        return ch
    ch.work_orders = rows(conn, "SELECT * FROM packet_work_orders WHERE packet_id = %s ORDER BY sort, id", (pid,))
    if shorts:
        for r in rows(
            conn,
            "SELECT * FROM short_receipts WHERE short_id = ANY(%s) ORDER BY id",
            ([s["id"] for s in shorts],),
        ):
            ch.receipts.setdefault(r["short_id"], []).append(r)
    ch.heat_tags = rows(
        conn, "SELECT * FROM heat_tags WHERE packet_id = %s AND removed_at IS NULL ORDER BY tag_no", (pid,)
    )
    ch.heat_table = rows(conn, "SELECT * FROM heat_table_placements WHERE packet_id = %s ORDER BY page", (pid,))
    ch.wh = one(
        conn, "SELECT *, stage::text AS stage FROM packet_wh WHERE packet_id = %s AND closed_at IS NULL", (pid,)
    )
    ch.qc_history = rows(conn, "SELECT * FROM qc_history WHERE packet_id = %s ORDER BY id", (pid,))
    ch.change_orders = rows(
        conn,
        "SELECT *, origin::text AS origin, review::text AS review FROM change_orders WHERE packet_id = %s"
        " ORDER BY co_no",
        (pid,),
    )
    co_ids = [c["id"] for c in ch.change_orders]
    if co_ids:
        for r in rows(conn, "SELECT * FROM co_items WHERE co_id = ANY(%s) ORDER BY id", (co_ids,)):
            ch.co_items.setdefault(r["co_id"], []).append(r)
        for r in rows(
            conn, "SELECT co_id, dept_code FROM co_required_depts WHERE co_id = ANY(%s) ORDER BY dept_code", (co_ids,)
        ):
            ch.co_required.setdefault(r["co_id"], []).append(r["dept_code"])
        for r in rows(conn, "SELECT * FROM co_verifications WHERE co_id = ANY(%s) ORDER BY at", (co_ids,)):
            ch.co_verified.setdefault(r["co_id"], []).append(r)
    ch.docs = rows(
        conn, "SELECT * FROM packet_docs WHERE packet_id = %s AND removed_at IS NULL ORDER BY added_at, id", (pid,)
    )
    ch.seal = one(conn, "SELECT * FROM packet_seals WHERE packet_id = %s ORDER BY id DESC LIMIT 1", (pid,))
    return ch


def state_from(row: Mapping[str, Any], ch: Children) -> policy.PacketState:
    weld = bool(ch.dept.get("weld"))
    live_bom = [b for b in ch.bom if not b["na"]]
    stage = ch.open_stage
    return policy.PacketState(
        id=int(row["id"]),
        status=str(row["status"]),
        dept=str(row["dept_code"]),
        station_id=row["station_id"],
        welder_id=uid_text(row["welder_id"]),
        wh_skipped=bool(row["wh_skipped"]),
        routed_to=row["routed_to"],
        vclosed=row["vclosed_at"] is not None,
        removed=row["removed_at"] is not None,
        source_kind=str(row["source_kind"]),
        weld_dept=weld,
        co_hold=bool(ch.open_cos),
        co_hold_why=co_hold_why(ch.open_cos, ch.dept_names),
        open_shorts=len(ch.shorts),
        drawing_attached=any(pg["type"] == "drawing" and pg["void_at"] is None for pg in ch.pages),
        heat_map=row["heat_map"],
        bom_total=len(live_bom),
        bom_ready=sum(1 for b in live_bom if b["pulled"] or b["id"] in ch.shorts),
        welds=len(ch.welds),
        checklist_complete=stage is not None and checklists.checklist_complete(stage["checklist"], weld),
        filler_set=stage is not None and bool((stage["filler"] or "").strip()),
        qc_missing=tuple(checklists.qc_missing(row, ch.qc, ch.welds)),
        has_qc_sent=ch.qc is not None,
    )


def packet_state(conn: Any, row: Mapping[str, Any]) -> policy.PacketState:
    """The policy's view of a packet row, from its child rows."""
    return state_from(row, load_children(conn, row, full=False))


def holder_text(state: policy.PacketState, ch: Children) -> str:
    return policy.holder_name(state, ch.dept.get("name"), (ch.station or {}).get("name"))


# ---------------------------------------------------------------- shaping


class People:
    """Display names for who references. In seal mode a reference is the id only."""

    def __init__(self, conn: Any, ids: Iterable[Any], *, seal: bool = False):
        self.seal = seal
        want = sorted({str(i) for i in ids if i is not None})
        self.names: dict[str, str] = {}
        if want and not seal:
            for r in conn.execute(
                "SELECT id, display_name FROM users WHERE id = ANY(%s)", ([uuid.UUID(i) for i in want],)
            ):
                self.names[str(r[0])] = r[1]

    def ref(self, uid: Any) -> dict[str, Any] | None:
        if uid is None:
            return None
        if self.seal:
            return {"id": str(uid)}
        return {"id": str(uid), "display_name": self.names.get(str(uid))}


def _station_ref(conn: Any, station_id: Any, cache: dict[Any, dict[str, Any] | None]) -> dict[str, Any] | None:
    if station_id is None:
        return None
    if station_id not in cache:
        cache[station_id] = one(conn, "SELECT id, name FROM stations WHERE id = %s", (station_id,))
    return cache[station_id]


def _stage(conn: Any, s: Mapping[str, Any], people: People, cache: dict[Any, Any], *, closed: bool) -> dict[str, Any]:
    welder = people.ref(s["welder_id"])
    if welder is not None:
        welder["stamp"] = s["welder_stamp"]
    out = {
        "id": s["id"],
        "dept_code": s["dept_code"],
        "station": _station_ref(conn, s["station_id"], cache),
        "welder": welder,
        "checklist": s["checklist"] or {},
        "filler": s["filler"],
        "filler_lot": s["filler_lot"],
        "preheat": s["preheat"],
        "notes": s["notes"],
        "clock": {
            "elapsed_ms": int(s["clock_elapsed_ms"] or 0),
            "running_since": s["clock_running_since"],
            "started_at": s["clock_started_at"],
        },
        "opened_at": s["opened_at"],
        "row_version": s["row_version"],
    }
    if closed:
        out["closed_at"] = s["closed_at"]
    return out


def _qc(q: Mapping[str, Any], people: People) -> dict[str, Any]:
    keys = (
        "id",
        "sent_at",
        "book",
        "spool",
        "location",
        "sent_note",
        "nde_method",
        "nde_result",
        "nde_report",
        "hardness",
        "nace",
        "inspector",
        "stamp",
        "notes",
        "result",
        "result_at",
        "result_note",
        "row_version",
    )
    out = {k: q[k] for k in keys}
    out["sent_by"] = people.ref(q["sent_by"])
    out["result_by"] = people.ref(q["result_by"])
    out["checks"] = q["checks"] or {}
    out["weld_exam"] = q["weld_exam"] or {}
    return out


def _who_ids(row: Mapping[str, Any], ch: Children) -> list[Any]:
    ids: list[Any] = [row["welder_id"], row["for_sup_id"], row["vclosed_by"], row["removed_by"]]
    ids += [w["welder_id"] for w in ch.welds]
    ids += [s["welder_id"] for s in ch.stages]
    if ch.wh:
        ids.append(ch.wh["by"])
    if ch.qc:
        ids += [ch.qc["sent_by"], ch.qc["result_by"]]
    ids += [d["added_by"] for d in ch.docs]
    for c in ch.change_orders:
        ids += [c["issued_by"], c["approved_by"], c["rejected_by"]]
    for vs in ch.co_verified.values():
        ids += [v["by"] for v in vs]
    for rs in ch.receipts.values():
        ids += [r["by"] for r in rs]
    return ids


def _unit(conn: Any, unit_id: int, *, seal: bool) -> dict[str, Any]:
    if seal:
        return {"id": unit_id}
    u = one(
        conn,
        "SELECT u.id, u.lot, u.name, u.number, u.due_effective, p.id AS project_id, p.number AS project_number,"
        " p.name AS project_name, p.customer, p.po, p.status::text AS project_status"
        " FROM v_units u JOIN projects p ON p.id = u.project_id WHERE u.id = %s",
        (unit_id,),
    )
    if u is None:
        return {"id": unit_id, "number": None, "lot": None, "name": None, "project": None, "due_effective": None}
    return {
        "id": u["id"],
        "number": u["number"],
        "lot": u["lot"],
        "name": u["name"],
        "project": {
            "id": u["project_id"],
            "number": u["project_number"],
            "name": u["project_name"],
            "customer": u["customer"],
            "po": u["po"],
            "status": u["project_status"],
        },
        "due_effective": u["due_effective"],
    }


def build(
    conn: Any,
    row: Mapping[str, Any],
    pp: policy.Principal | None,
    *,
    include_children: bool = True,
    seal: bool = False,
) -> dict[str, Any]:
    """The read model of one loaded packets row. pp None (seal mode) leaves out can, blocked and holder."""
    ch = load_children(conn, row, full=True)
    state = state_from(row, ch)
    people = People(conn, _who_ids(row, ch), seal=seal)
    cache: dict[Any, Any] = {}
    welder = people.ref(row["welder_id"])
    if welder is not None:
        welder["stamp"] = row["welder_stamp"]
    weld = bool(ch.dept.get("weld"))
    out: dict[str, Any] = {
        "id": row["id"],
        "version": row["version"],
        "unit": _unit(conn, row["unit_id"], seal=seal),
        "dept": {"code": ch.dept["code"], "name": ch.dept["name"], "weld": weld},
        "op": row["op"],
        "title": row["title"],
        "customer": row["customer"],
        "drawing": row["drawing"],
        "rev": row["rev"],
        "wps": row["wps"],
        "status": row["status"],
        "status_at": row["status_at"],
        "station": ch.station,
        "welder": welder,
        "for_sup": people.ref(row["for_sup_id"]),
        "heat_map": row["heat_map"],
        "wh_skipped": row["wh_skipped"],
        "wh_sent_at": row["wh_sent_at"],
        "routed_to": row["routed_to"],
        "return_note": row["return_note"],
        "vclosed": None
        if row["vclosed_at"] is None
        else {"at": row["vclosed_at"], "by": people.ref(row["vclosed_by"])},
        "databook_at": row["databook_at"],
        "source_kind": row["source_kind"],
        "source": row["source"] or {},
        "drawing_state": row["drawing_state"],
        "flags": list(row["flags"] or []),
        "visual": row["visual"] or {},
        "removed": None
        if row["removed_at"] is None
        else {"at": row["removed_at"], "by": people.ref(row["removed_by"]), "reason": row["removed_reason"]},
        "open_cos": [c["co_no"] for c in ch.open_cos],
        "open_shorts": len(ch.shorts),
    }
    if include_children:
        out["work_orders"] = [
            {
                k: w[k]
                for k in (
                    "id",
                    "wo_base",
                    "lot",
                    "split",
                    "sub",
                    "seq",
                    "qty",
                    "target_hrs",
                    "op",
                    "description",
                    "visual_status",
                    "gone_at",
                    "row_version",
                )
            }
            for w in ch.work_orders
        ]
        out["pages"] = [
            {
                "n": pg["n"],
                "type": pg["type"],
                "asset_id": uid_text(pg["asset_id"]),
                "pn": pg["pn"],
                "dwg": pg["dwg"],
                "rev": pg["rev"],
                "void": None
                if pg["void_at"] is None
                else {"co_id": pg["void_co_id"], "at": pg["void_at"], "new_n": pg["void_new_n"]},
                "url": f"/_blob/{pg['asset_id']}" if pg["asset_id"] else None,
            }
            for pg in ch.pages
        ]
        out["bom"] = [_bom(b, ch, people) for b in ch.bom]
        out["welds"] = [_weld(w, people) for w in ch.welds]
        out["heat_tags"] = [
            {k: t[k] for k in ("tag_no", "page", "item", "fx", "fy", "row_version")} for t in ch.heat_tags
        ]
        out["heat_table"] = [{k: h[k] for k in ("page", "x", "y", "s")} for h in ch.heat_table]
        st = ch.open_stage
        out["stage"] = _stage(conn, st, people, cache, closed=False) if st else None
        out["stages"] = [_stage(conn, s, people, cache, closed=True) for s in ch.stages if s["closed_at"] is not None]
        out["wh"] = (
            None
            if ch.wh is None
            else {
                "stage": ch.wh["stage"],
                "by": people.ref(ch.wh["by"]),
                "at": ch.wh["at"],
                "reason": ch.wh["reason"],
                "note": ch.wh["note"],
                "auto": ch.wh["auto"],
            }
        )
        out["qc"] = _qc(ch.qc, people) if ch.qc else None
        out["qc_history"] = [
            {k: h[k] for k in ("id", "at", "result", "inspector", "note", "dept_code")} for h in ch.qc_history
        ]
        out["change_orders"] = [_co(c, ch, people) for c in ch.change_orders]
        out["docs"] = [
            {
                "id": d["id"],
                "asset_id": str(d["asset_id"]),
                "kind": d["kind"],
                "title": d["title"],
                "added_at": d["added_at"],
                "added_by": people.ref(d["added_by"]),
                "url": f"/_blob/{d['asset_id']}",
            }
            for d in ch.docs
        ]
    out["seal"] = (
        None
        if ch.seal is None
        else {"sealed_at": ch.seal["sealed_at"], "key_id": ch.seal["key_id"], "broken_at": ch.seal["broken_at"]}
    )
    out["checklist_items"] = checklists.checklist_for(weld, row["drawing"], row["rev"], row["wps"])
    out["qc_items"] = checklists.qc_items_for(row["drawing"], row["rev"], row["wps"], row["welder_stamp"])
    out["flag"] = flag_of(row["status"], row["source_kind"], row["flags"], row["drawing_state"])
    if pp is not None:
        allowed, blocked = policy.can(pp, state)
        out["can"] = [str(a) for a in allowed]
        out["blocked"] = {str(a): r for a, r in blocked.items()}
        out["holder"] = holder_text(state, ch)
    if seal:
        for k in SEAL_EXCLUDE:
            out.pop(k, None)
    return out


def _bom(b: Mapping[str, Any], ch: Children, people: People) -> dict[str, Any]:
    keys = (
        "id",
        "item",
        "qty",
        "part_id",
        "description",
        "dwg_ref",
        "cl_item",
        "length",
        "material",
        "heat",
        "na",
        "issued",
        "loc",
        "pulled",
        "src",
        "row_version",
    )
    out = {k: b[k] for k in keys}
    out["mtr_asset_id"] = uid_text(b["mtr_asset_id"])
    s = ch.shorts.get(b["id"])
    out["short"] = (
        None
        if s is None
        else {
            "id": s["id"],
            "qty": s["qty"],
            "qty_open": s["qty_open"],
            "reason": s["reason"],
            "ref": s["ref"],
            "eta": s["eta"],
            "note": s["note"],
            "opened_at": s["opened_at"],
            "receipts": [
                {
                    "id": r["id"],
                    "qty": r["qty"],
                    "heat": r["heat"],
                    "note": r["note"],
                    "at": r["at"],
                    "by": people.ref(r["by"]),
                }
                for r in ch.receipts.get(s["id"], [])
            ],
            "row_version": s["row_version"],
        }
    )
    return out


def _weld(w: Mapping[str, Any], people: People) -> dict[str, Any]:
    keys = ("weld_no", "page", "fx", "fy", "wo_base", "piece", "type", "size", "process", "stamp", "at", "row_version")
    out = {k: w[k] for k in keys}
    out["items"] = list(w["items"] or [])
    out["welder"] = people.ref(w["welder_id"])
    return out


def _co(c: Mapping[str, Any], ch: Children, people: People) -> dict[str, Any]:
    keys = (
        "id",
        "co_no",
        "origin",
        "review",
        "minor",
        "hold",
        "ecn",
        "reason",
        "issued_at",
        "approved_at",
        "rejected_at",
        "rejected_reason",
        "row_version",
    )
    out = {k: c[k] for k in keys}
    out["issued_by"] = people.ref(c["issued_by"])
    out["approved_by"] = people.ref(c["approved_by"])
    out["rejected_by"] = people.ref(c["rejected_by"])
    out["items"] = [
        {k: i[k] for k in ("old_page", "old_dwg", "old_rev", "new_page", "new_dwg", "new_rev", "added")}
        for i in ch.co_items.get(c["id"], [])
    ]
    out["required"] = ch.co_required.get(c["id"], [])
    out["verified"] = {
        v["dept_code"]: {"by": people.ref(v["by"]), "at": v["at"], "note": v["note"]}
        for v in ch.co_verified.get(c["id"], [])
    }
    return out


def read_packet(
    conn: Any, packet_id: int, policy_principal: policy.Principal | None, *, include_children: bool = True
) -> dict[str, Any]:
    """The read model, or 404 not_found. A removed packet reads fine, with `removed` set."""
    row = load_row(conn, packet_id)
    if row is None:
        raise ApiError(404, "not_found", "No such packet.")
    return build(conn, row, policy_principal, include_children=include_children)


def seal_content(conn: Any, row: Mapping[str, Any]) -> dict[str, Any]:
    """What a filing seal covers: the read model without the volatile and derived keys (SEAL_EXCLUDE)."""
    return build(conn, row, None, include_children=True, seal=True)


# ---------------------------------------------------------------- board cards


CARD_SQL = """
SELECT p.id, p.version, p.unit_id, u.lot, pr.number || u.lot AS unit_number, pr.id AS project_id,
       pr.number AS project_number, pr.name AS project_name, p.dept_code, d.name AS dept_name, d.weld,
       p.op, p.title, p.customer, p.drawing, p.rev, p.status::text AS status, p.status_at, p.station_id,
       st.name AS station_name, p.welder_id, wu.display_name AS welder_name, p.welder_stamp,
       p.routed_to::text AS routed_to, p.vclosed_at, p.vclosed_by, vu.display_name AS vclosed_name,
       p.source_kind::text AS source_kind, p.flags, p.drawing_state::text AS drawing_state, p.wh_skipped,
       p.heat_map, p.removed_at, coalesce(u.due, pr.due) AS due_effective, p.updated_at,
       (SELECT w.stage::text FROM packet_wh w WHERE w.packet_id = p.id AND w.closed_at IS NULL) AS wh_stage,
       (SELECT count(*) FROM bom_shorts s WHERE s.packet_id = p.id AND s.closed_at IS NULL) AS open_shorts,
       (SELECT count(*) FROM packet_work_orders wo WHERE wo.packet_id = p.id) AS wo_count,
       (SELECT coalesce(json_agg(json_build_object('co_no', c.co_no, 'review', c.review,
                                                   'pending_depts', c.pending_depts) ORDER BY c.co_no), '[]')
          FROM v_open_cos c WHERE c.packet_id = p.id) AS open_co_rows
FROM packets p
JOIN units u ON u.id = p.unit_id
JOIN projects pr ON pr.id = u.project_id
JOIN departments d ON d.code = p.dept_code
LEFT JOIN stations st ON st.id = p.station_id
LEFT JOIN users wu ON wu.id = p.welder_id
LEFT JOIN users vu ON vu.id = p.vclosed_by
"""

FLAG_ON = ("1", "true", "yes", "any", "flagged")
FLAG_OFF = ("0", "false", "no", "none")


def _like(word: str) -> str:
    return "%" + word.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_") + "%"


def card_state(r: Mapping[str, Any], names: Mapping[str, str]) -> policy.PacketState:
    """PacketState from header columns and counts. Child-row facts the board does not load pass (the packet
    page decides them): checklist, welds, filler, BOM pulled, Q.C. items."""
    cos = r["open_co_rows"] or []
    return policy.PacketState(
        id=int(r["id"]),
        status=str(r["status"]),
        dept=str(r["dept_code"]),
        station_id=r["station_id"],
        welder_id=uid_text(r["welder_id"]),
        wh_skipped=bool(r["wh_skipped"]),
        routed_to=r["routed_to"],
        vclosed=r["vclosed_at"] is not None,
        removed=r["removed_at"] is not None,
        source_kind=str(r["source_kind"]),
        weld_dept=bool(r["weld"]),
        co_hold=bool(cos),
        co_hold_why=co_hold_why(cos, names),
        open_shorts=int(r["open_shorts"] or 0),
        drawing_attached=r["drawing_state"] in DRAWING_STATES_ATTACHED,
        heat_map=r["heat_map"],
        bom_total=0,
        bom_ready=0,
        welds=1,
        checklist_complete=True,
        filler_set=True,
        qc_missing=(),
        has_qc_sent=r["status"] == "qc",
    )


def list_cards(conn: Any, policy_principal: policy.Principal, filters: Mapping[str, Any]) -> list[dict[str, Any]]:
    """The board cards. Filters: status (comma list), dept, unit_id, project_id, q, flag, limit, removed."""
    where: list[str] = []
    params: list[Any] = []
    if not filters.get("removed"):
        where.append("p.removed_at IS NULL")
    status = [s.strip() for s in str(filters.get("status") or "").split(",") if s.strip()]
    if status:
        where.append("p.status::text = ANY(%s)")
        params.append(status)
    if filters.get("dept"):
        where.append("p.dept_code = %s")
        params.append(str(filters["dept"]))
    if filters.get("unit_id") is not None:
        where.append("p.unit_id = %s")
        params.append(int(filters["unit_id"]))
    if filters.get("project_id") is not None:
        where.append("u.project_id = %s")
        params.append(int(filters["project_id"]))
    flag = str(filters.get("flag") or "").strip().lower()
    if flag in FLAG_ON:
        where.append(FLAG_SQL)
    elif flag in FLAG_OFF:
        where.append("NOT " + FLAG_SQL)
    elif flag == "hand":
        where.append("(p.status = 'draft' AND p.source_kind = 'hand')")
    for word in str(filters.get("q") or "").split()[:8]:
        pat = _like(word)
        where.append(
            "(pr.number ILIKE %s OR pr.name ILIKE %s OR (pr.number || u.lot) ILIKE %s OR u.lot ILIKE %s"
            " OR p.drawing ILIKE %s OR p.customer ILIKE %s OR pr.customer ILIKE %s OR pr.po ILIKE %s"
            " OR p.title ILIKE %s OR EXISTS (SELECT 1 FROM packet_work_orders wo WHERE wo.packet_id = p.id"
            " AND wo.wo_base ILIKE %s))"
        )
        params += [pat] * 10
    sql = CARD_SQL + (" WHERE " + " AND ".join(where) if where else "")
    sql += " ORDER BY p.updated_at DESC, p.id DESC LIMIT %s"
    params.append(int(filters.get("limit") or 500))
    names = dept_names(conn)
    transitions = {str(a) for a in policy.TRANSITIONS}
    out: list[dict[str, Any]] = []
    for r in rows(conn, sql, params):
        state = card_state(r, names)
        allowed, blocked = policy.can(policy_principal, state)
        welder = (
            None
            if r["welder_id"] is None
            else {"id": str(r["welder_id"]), "display_name": r["welder_name"], "stamp": r["welder_stamp"]}
        )
        out.append(
            {
                "id": r["id"],
                "version": r["version"],
                "unit": {"id": r["unit_id"], "number": r["unit_number"]},
                "project": {"id": r["project_id"], "number": r["project_number"], "name": r["project_name"]},
                "dept": {"code": r["dept_code"], "name": r["dept_name"]},
                "op": r["op"],
                "title": r["title"],
                "customer": r["customer"],
                "drawing": r["drawing"],
                "rev": r["rev"],
                "status": r["status"],
                "status_at": r["status_at"],
                "station": None if r["station_id"] is None else {"id": r["station_id"], "name": r["station_name"]},
                "welder": welder,
                "routed_to": r["routed_to"],
                "vclosed": None
                if r["vclosed_at"] is None
                else {
                    "at": r["vclosed_at"],
                    "by": None
                    if r["vclosed_by"] is None
                    else {"id": str(r["vclosed_by"]), "display_name": r["vclosed_name"]},
                },
                "source_kind": r["source_kind"],
                "flag": flag_of(r["status"], r["source_kind"], r["flags"], r["drawing_state"]),
                "open_cos": [c["co_no"] for c in r["open_co_rows"] or []],
                "open_shorts": int(r["open_shorts"] or 0),
                "wh_stage": r["wh_stage"],
                "due_effective": r["due_effective"],
                "updated_at": r["updated_at"],
                "holder": policy.holder_name(state, r["dept_name"], r["station_name"]),
                "can": [str(a) for a in allowed if str(a) in transitions],
                "blocked": {str(a): v for a, v in blocked.items() if str(a) in transitions},
                "wo_count": int(r["wo_count"] or 0),
                "removed": r["removed_at"] is not None,
            }
        )
    return out