"""The warehouse board: KPIs, the four stage columns, the released column and the open shorts.

Any signed-in session reads it. It reads PostgreSQL only. The cards are the list_cards shape, so the pill, the wh
line and the pull progress read the same on every screen.
"""

from __future__ import annotations

from datetime import UTC, date, datetime
from typing import Any
from zoneinfo import ZoneInfo, ZoneInfoNotFoundError

from fastapi import APIRouter, Depends, Query, Request

from ..domain import packets
from ..text import clean_text
from .deps import Db, Principal, current_principal, get_db, settings_of

router = APIRouter(prefix="/api/warehouse", tags=["warehouse"])

STAGES = ("incoming", "pulling", "hold", "pulled")
RELEASED_DAYS = 3
BOARD_LIMIT = 5000

# Packets with a wh_release transition in the window; a packet back in the warehouse is on a stage column instead.
RELEASED_SQL = """
SELECT t.packet_id, max(t.at) AS released_at
FROM packet_transitions t JOIN packets p ON p.id = t.packet_id JOIN units u ON u.id = p.unit_id
WHERE t.action = 'wh_release' AND t.at > now() - %s * interval '1 day' AND p.status <> 'warehouse'
  AND p.removed_at IS NULL {scope}
GROUP BY t.packet_id
"""

SHORTS_SQL = """
SELECT s.id AS short_id, s.packet_id, s.bom_line_id, s.qty_open, s.reason, s.ref, s.eta, s.note, s.opened_at,
       s.row_version, b.item, b.description, b.part_id, b.material, b.length, b.qty, b.na
FROM bom_shorts s JOIN bom_lines b ON b.id = s.bom_line_id
WHERE s.closed_at IS NULL AND s.packet_id = ANY(%s)
ORDER BY s.eta NULLS LAST, s.opened_at, s.id
"""


# The KPIs. {scope} is the fixed project and unit terms from _scope, never request text.
KPI_NAMES = {"incoming": "waiting", "pulling": "pulling", "hold": "hold", "pulled": "pulled"}
KPI_STAGES_SQL = """
SELECT coalesce(w.stage::text, 'incoming'), count(*)
FROM packets p JOIN units u ON u.id = p.unit_id LEFT JOIN packet_wh w ON w.packet_id = p.id AND w.closed_at IS NULL
WHERE p.status = 'warehouse' AND p.removed_at IS NULL {scope}
GROUP BY 1
"""
KPI_SHORTS_SQL = """
SELECT count(*) FROM bom_shorts s JOIN packets p ON p.id = s.packet_id JOIN units u ON u.id = p.unit_id
WHERE s.closed_at IS NULL AND p.removed_at IS NULL {scope}
"""
KPI_RELEASED_SQL = """
SELECT count(DISTINCT t.packet_id)
FROM packet_transitions t JOIN packets p ON p.id = t.packet_id JOIN units u ON u.id = p.unit_id
WHERE t.action = 'wh_release' AND t.at > now() - interval '24 hours' AND p.status <> 'warehouse'
  AND p.removed_at IS NULL {scope}
"""


def _tz(request: Request) -> Any:
    try:
        return ZoneInfo(settings_of(request).site_tz)
    except (ZoneInfoNotFoundError, ValueError):
        return UTC


def _scope(filters: dict[str, Any]) -> tuple[str, list[Any]]:
    """The project and unit terms (the KPIs follow these only), over packets p and units u."""
    terms: list[str] = []
    params: list[Any] = []
    if filters.get("unit_id") is not None:
        terms.append("p.unit_id = %s")
        params.append(int(filters["unit_id"]))
    if filters.get("project_id") is not None:
        terms.append("u.project_id = %s")
        params.append(int(filters["project_id"]))
    return "".join(f" AND {t}" for t in terms), params


def _order_key(card: dict[str, Any], tz: Any) -> tuple[str, str, float]:
    """The old whOrder: the day it was sent, then VISUAL's release date (none last), then the exact time."""
    sent = card.get("wh_sent_at")
    day = sent.astimezone(tz).date().isoformat() if isinstance(sent, datetime) else "9999"
    rel = card.get("visual_rel")
    rel_text = rel.isoformat() if isinstance(rel, date) else "9999"
    exact = sent.timestamp() if isinstance(sent, datetime) else float("inf")
    return day, rel_text, exact


def _kpis(conn: Any, filters: dict[str, Any]) -> dict[str, int]:
    scope, params = _scope(filters)
    out = {"waiting": 0, "pulling": 0, "hold": 0, "pulled": 0, "open_shorts": 0, "released_24h": 0}
    for stage, n in conn.execute(KPI_STAGES_SQL.format(scope=scope), params):
        if stage in KPI_NAMES:
            out[KPI_NAMES[stage]] = int(n)
    out["open_shorts"] = int(conn.execute(KPI_SHORTS_SQL.format(scope=scope), params).fetchone()[0])
    out["released_24h"] = int(conn.execute(KPI_RELEASED_SQL.format(scope=scope), params).fetchone()[0])
    return out


def _short_row(s: dict[str, Any], card: dict[str, Any], today: date, now: datetime) -> dict[str, Any]:
    eta = s["eta"]
    return {
        "packet": {
            "id": card["id"],
            "unit_number": card["unit"]["number"],
            "op": card["op"],
            "drawing": card["drawing"],
            "status": card["status"],
            "wh_stage": card["wh_stage"],
            "station": card["station"],
            "holder": card["holder"],
            "dept": card["dept"],
        },
        "item": s["item"],
        "bom_line_id": s["bom_line_id"],
        "description": s["description"],
        "part_id": s["part_id"],
        "material": s["material"],
        "length": s["length"],
        "qty": s["qty"],
        "qty_open": s["qty_open"],
        "na": bool(s["na"]),
        "reason": s["reason"],
        "ref": s["ref"],
        "eta": eta,
        "note": s["note"],
        "opened_at": s["opened_at"],
        "age_days": max(0, (now - s["opened_at"]).days),
        "late": eta is not None and eta < today,
        "short_id": s["short_id"],
        "row_version": s["row_version"],
    }


@router.get("/board")
def board(
    request: Request,
    p: Principal = Depends(current_principal),  # noqa: B008
    d: Db = Depends(get_db),  # noqa: B008
    q: str = Query("", max_length=200),
    project_id: int | None = Query(None),
    unit_id: int | None = Query(None),
    dept: str = Query("", max_length=10),
) -> dict[str, Any]:
    conn = d.conn
    pp = packets.policy_principal_for(conn, p)
    tz = _tz(request)
    filters: dict[str, Any] = {
        "q": clean_text(q, 200),
        "project_id": project_id,
        "unit_id": unit_id,
        "dept": dept.strip() or None,
        "limit": BOARD_LIMIT,
    }

    columns: dict[str, list[dict[str, Any]]] = {st: [] for st in (*STAGES, "released")}
    for card in packets.list_cards(conn, pp, {**filters, "status": "warehouse"}):
        columns[card["wh_stage"] if card["wh_stage"] in STAGES else "incoming"].append(card)
    for st in STAGES:
        columns[st].sort(key=lambda c: _order_key(c, tz))

    scope, params = _scope(filters)
    released = {int(r[0]): r[1] for r in conn.execute(RELEASED_SQL.format(scope=scope), [RELEASED_DAYS, *params])}
    if released:
        cards = packets.list_cards(conn, pp, {**filters, "ids": list(released)})
        for card in cards:
            card["released_at"] = released[int(card["id"])]
        cards.sort(key=lambda c: (c["released_at"], c["id"]), reverse=True)
        columns["released"] = cards

    short_ids = [int(r[0]) for r in conn.execute("SELECT DISTINCT packet_id FROM bom_shorts WHERE closed_at IS NULL")]
    shorts: list[dict[str, Any]] = []
    if short_ids:
        by_id = {int(c["id"]): c for c in packets.list_cards(conn, pp, {**filters, "ids": short_ids})}
        if by_id:
            now = datetime.now(UTC)
            today = now.astimezone(tz).date()
            for sr in packets.rows(conn, SHORTS_SQL, (list(by_id),)):
                shorts.append(_short_row(sr, by_id[int(sr["packet_id"])], today, now))

    return {"kpis": _kpis(conn, filters), "columns": columns, "shorts": shorts}