"""Q.C.: the home board, the accept and reject log texts, and the packet document kinds.

The home board ports the old homeQC: packets waiting for inspection, the latest accepted, and the rejected ones back
with their supervisor, plus the project folders. The texts port the old qcAccept and qcReject handlers.
"""

from __future__ import annotations

from collections.abc import Mapping
from typing import Any

from .. import policy
from ..notify import raise_event
from ..text import LIMITS
from . import itp, packets, qcdocs, search

A = policy.Action

# Packet document kinds (the old PDOC_TYPES): kind -> label.
DOC_KINDS: dict[str, str] = {
    "nde": "NDE report (RT / UT / MT / PT)",
    "hydro": "Hydrotest report",
    "dimensional": "Dimensional report",
    "pmi": "PMI report",
    "coating": "Coating / paint report",
    "coc": "Certificate of conformance",
    "customer": "Customer inspection report",
    "ncr": "NCR",
    "other": "Other",
}
DOC_MIMES = qcdocs.DOC_MIMES
DOC_NOTE_MAX = LIMITS["doc_note"]

NDE_METHODS: tuple[str, ...] = ("None required", "RT", "UT", "MT", "PT")
NDE_NONE = "None required"
NDE_RESULTS: tuple[str, ...] = ("", "Acceptable", "Rejectable")

# The accept routes (the old ROUTES). The en dash is the old text.
ROUTE_TEXTS = {"databook": "Clerical – Data Book", "shipping": "Shipping"}
ACCEPTED_ON_BOARD = 8


# ---------------------------------------------------------------- texts


def weld_label(no: Any) -> str:
    return f"W{no}"


def rejected_welds(exam: Mapping[str, Any] | None) -> list[str]:
    """The weld ids with a reject result, sorted by number: ["W1", "W3"]."""
    nos: list[int] = []
    for k, v in (exam or {}).items():
        if isinstance(v, Mapping) and str(v.get("result") or "").lower() == "reject":
            try:
                nos.append(int(k))
            except (TypeError, ValueError):
                continue
    return [weld_label(n) for n in sorted(nos)]


def inspector_text(insp: Mapping[str, Any] | None) -> str:
    q = insp or {}
    who = str(q.get("inspector") or "").strip()
    stamp = str(q.get("stamp") or "").strip()
    return f"{who} [{stamp}]" if stamp else who


def _notify_reject(w: Any, why: str) -> None:
    """qc_reject for the packet's department, in the write's transaction (notify-send mails it)."""
    pkt = w.packet
    dept = str(w.from_dept or pkt.get("dept_code") or "") or None
    what = str(pkt.get("title") or pkt.get("drawing") or "")
    who = (w.principal.user or {}).get("display_name") or ""
    raise_event(
        w.conn,
        "qc_reject",
        subject=f"packet:{w.id}",
        title=f"Q.C. rejected packet {w.id}" + (f" ({what})" if what else "") + (f", dept {dept}" if dept else ""),
        body="\n".join(x for x in (f"Rejected by {who}." if who else "", why) if x),
        detail={"packet_id": w.id, "dept_code": dept, "by": str(w.user_id)},
        dept_code=dept,
    )


def qc_texts(w: Any, a: policy.Action, to_dept: str) -> None:
    """The packet_log label and note of a Q.C. accept or reject. Called before the side effects close the inspection.

    `w` is the pipeline Write; its extra holds `reason_text` and `ncr` for a reject.
    """
    insp = packets.one(w.conn, "SELECT * FROM qc_inspections WHERE packet_id = %s AND closed_at IS NULL", (w.id,))
    note = str(w.extra.get("note") or "").strip() or None
    if a is A.QC_REJECT:
        exam = (insp or {}).get("weld_exam") or {}
        parts = [str(w.extra.get("ncr") or ""), str(w.extra.get("reason_text") or "")]
        welds = rejected_welds(exam)
        if welds:
            parts.append("welds " + ", ".join(welds))
        w.log("Q.C. rejected → supervisor", " · ".join(x for x in parts if x) or None)
        _notify_reject(w, " · ".join(x for x in parts if x))
        return
    if a is A.QC_ACCEPT_AND_ROUTE:
        labels = getattr(w.children, "dept_labels", None) or packets.dept_labels(w.conn)
        text = " · ".join(x for x in (inspector_text(insp), f"from {labels.get(w.from_dept, w.from_dept)}", note) if x)
        w.log(f"Q.C. accepted → {labels.get(to_dept, to_dept)}", text)
        return
    if a is A.QC_ACCEPT:
        n = len(w.children.welds) if w.children is not None else 0
        parts = [inspector_text(insp), f"{n} welds VT accepted"]
        method = str((insp or {}).get("nde_method") or "").strip()
        if method and method != NDE_NONE:
            parts.append(f"{method} {(insp or {}).get('nde_result') or ''}".strip())
        if note:
            parts.append(note)
        route = ROUTE_TEXTS.get(str(w.extra.get("routed_to")), str(w.extra.get("routed_to")))
        w.log(f"Q.C. accepted → {route}", " · ".join(x for x in parts if x))


# ---------------------------------------------------------------- the home board


def _last_results(conn: Any, packet_ids: list[int]) -> dict[int, dict[str, Any]]:
    if not packet_ids:
        return {}
    rows = packets.rows(
        conn,
        "SELECT DISTINCT ON (packet_id) * FROM qc_history WHERE packet_id = ANY(%s) ORDER BY packet_id, id DESC",
        (packet_ids,),
    )
    return {int(r["packet_id"]): r for r in rows}


def _scope_where(project_id: int | None, unit_id: int | None) -> tuple[str, list[Any]]:
    """Fixed SQL fragments over the packets alias p, and their parameters."""
    where, params = "", []
    if unit_id is not None:
        where += " AND p.unit_id = %s"
        params.append(unit_id)
    if project_id is not None:
        where += " AND p.unit_id IN (SELECT id FROM units WHERE project_id = %s)"
        params.append(project_id)
    return where, params


LAST_SQL = (
    "SELECT p.id FROM packets p JOIN LATERAL (SELECT h.result, h.at, h.id FROM qc_history h"
    " WHERE h.packet_id = p.id ORDER BY h.id DESC LIMIT 1) h ON true"
    " WHERE p.removed_at IS NULL AND p.status::text = ANY(%s) AND h.result = %s"
)
WAITING_SQL = "SELECT count(*) FROM packets p WHERE p.removed_at IS NULL AND p.status = 'qc'"
BOARD_LIMIT = 5000
COUNT_SQL = (
    "SELECT count(DISTINCT l.packet_id) FROM packet_log l JOIN packets p ON p.id = l.packet_id"
    " WHERE l.at > now() - interval '7 days' AND l.action LIKE %s AND p.removed_at IS NULL"
)


def _ids_with_last(conn: Any, statuses: tuple[str, ...], result: str, where: str, params: list[Any]) -> list[int]:
    """Packets in the statuses whose newest qc_history result is `result`, newest result first."""
    sql = LAST_SQL + where + " ORDER BY h.id DESC"  # where: fixed fragments from _scope_where
    rows = conn.execute(sql, (list(statuses), result, *params)).fetchall()
    return [int(r[0]) for r in rows]


def _count_7d(conn: Any, prefix: str, where: str, params: list[Any]) -> int:
    row = conn.execute(COUNT_SQL + where, (prefix + "%", *params)).fetchone()
    return int(row[0] or 0)


def home(
    conn: Any,
    pp: policy.Principal,
    *,
    project_id: int | None = None,
    unit_id: int | None = None,
    filters: Mapping[str, Any] | None = None,
) -> dict[str, Any]:
    """GET /api/qc/home: the KPIs, the three boards and the active project folders. `filters` (the find bar's)
    narrow the cards of the three boards; the KPIs follow the project and unit only."""
    scope: dict[str, Any] = {"project_id": project_id, "unit_id": unit_id}
    narrow = search.board_filters(filters or {})
    narrow.update(scope)
    ready = sorted(
        packets.list_cards(conn, pp, {**narrow, "status": "qc", "limit": BOARD_LIMIT}),
        key=lambda c: (c["status_at"], c["id"]),
    )
    where, params = _scope_where(project_id, unit_id)
    acc_all = _ids_with_last(conn, ("complete", "filed"), "accepted", where, params)
    if search.narrowing(narrow) and acc_all:
        # The newest accepted packets that match the find bar (a light pass, no `can`), then the board's eight.
        hits = {
            c["id"]
            for c in packets.list_cards(conn, pp, {**narrow, "ids": acc_all, "lite": True, "limit": BOARD_LIMIT})
        }
        acc_all = [i for i in acc_all if i in hits]
    acc_ids = acc_all[:ACCEPTED_ON_BOARD]
    rej_ids = _ids_with_last(conn, ("review",), "rejected", where, params)
    by_id: dict[Any, dict[str, Any]] = {}
    if acc_ids or rej_ids:
        by_id = {
            c["id"]: c for c in packets.list_cards(conn, pp, {**narrow, "ids": acc_ids + rej_ids, "limit": BOARD_LIMIT})
        }
    accepted = [by_id[i] for i in acc_ids if i in by_id]
    rejected = [by_id[i] for i in rej_ids if i in by_id]
    _add_qc(conn, ready + accepted + rejected)
    waiting = len(ready)
    if search.narrowing(filters or {}):
        row = conn.execute(WAITING_SQL + where, params).fetchone()  # where: fixed fragments from _scope_where
        waiting = int(row[0] or 0)
    return {
        "kpis": {
            "waiting": waiting,
            "accepted_7d": _count_7d(conn, "Q.C. accepted", where, params),
            "rejected_7d": _count_7d(conn, "Q.C. rejected", where, params),
        },
        "columns": {"ready": ready, "accepted": accepted, "rejected": rejected},
        "folders": qcdocs.folders(conn, "active"),
        "facets": search.facets(conn, project_id=project_id, unit_id=unit_id),
    }


def _add_qc(conn: Any, cards: list[dict[str, Any]]) -> None:
    """Each card gains `qc` (the open inspection's location and sent time, or the last result) and itp_hold_count."""
    if not cards:
        return
    ids = [int(c["id"]) for c in cards]
    open_rows = {
        int(r["packet_id"]): r
        for r in packets.rows(
            conn,
            "SELECT packet_id, location, sent_at, inspector, result FROM qc_inspections"
            " WHERE packet_id = ANY(%s) AND closed_at IS NULL",
            (ids,),
        )
    }
    last = _last_results(conn, ids)
    units = itp.unit_itps(conn, [int(c["unit"]["id"]) for c in cards])
    for c in cards:
        pid = int(c["id"])
        o = open_rows.get(pid)
        if o is not None:
            c["qc"] = {k: o[k] for k in ("location", "sent_at", "inspector", "result")}
        elif pid in last:
            h = last[pid]
            snap = h.get("snapshot") or {}
            c["qc"] = {
                "location": snap.get("location"),
                "sent_at": snap.get("sent_at"),
                "inspector": h.get("inspector"),
                "result": h.get("result"),
            }
        else:
            c["qc"] = None
        u = units.get(int(c["unit"]["id"]))
        hold = itp.holds_for_packet(u[0], u[1], c["dept"]["code"]) if u else None
        c["itp_hold_count"] = hold["count"] if hold else 0