import { readdirSync } from "fs";
import path from "path";
import { opsDb } from "./db";
import { entitlements, type Entitlements, type PlanRow } from "../plan";

/* Everything the operations console knows about the facilities, in one place.
 *
 * This is the only module in the product that reads across facilities, and it reads through
 * opsDb() — the ops_ro role, which the database itself restricts to control-plane columns. So the
 * shape of what leaves here is decided twice: by the SELECTs below, and by grants that would
 * refuse a wider one. Nothing in a projection is a person: no name, no email, no photo, no note.
 * Group lists come out as lengths, the GL account as set-or-not, and contacts do not come out at
 * all — a reveal is a separate, narrow, trailed path.
 *
 * The demo facility is rebuilt every twenty minutes and would otherwise dominate every count, so
 * every projection splits it out rather than mixing it in.
 *
 * scripts/check-ops.sh asserts this file never imports the main client. */

const DAY = 24 * 60 * 60 * 1000;

/** The facility columns the console may read — the same allow-list as the ops_ro grant. */
const FACILITY_COLS = {
  id: true, name: true, timezone: true, defaultEntitlement: true, initialSets: true, capSets: true,
  defaultReorder: true, exceptionHigh: true, varianceReason: true, glAccount: true, journalDesc: true,
  lastBackup: true, barcodeLookup: true, staffGroups: true, nursingGroups: true, kitGroups: true,
  orderSeq: true, catalogSeq: true, requestSeq: true, rev: true, barcodeSeq: true, slipOrg: true,
  isDemo: true, demoResetAt: true, createdAt: true, plan: true, planNote: true, ssoEnabled: true, ssoRequired: true, ssoStaff: true,
  planStatus: true, trialEndsAt: true, paidUntil: true, grandfathered: true,
} as const;

/** The plan as the console shows it — the raw columns for the form, and what they mean today. */
export type PlanView = {
  plan: string; planNote: string; planStatus: string; trialEndsAt: Date | null; paidUntil: Date | null; grandfathered: boolean;
  label: string; state: Entitlements["state"]; readOnly: boolean; maxStaff: number | null;
  endsAt: Date | null; graceEndsAt: Date | null;
};

function planView(f: PlanRow & { plan: string; planNote: string }): PlanView {
  const e = entitlements(f);
  return {
    plan: f.plan, planNote: f.planNote, planStatus: f.planStatus, trialEndsAt: f.trialEndsAt, paidUntil: f.paidUntil, grandfathered: f.grandfathered,
    label: e.label, state: e.state, readOnly: e.readOnly, maxStaff: e.maxStaff, endsAt: e.endsAt, graceEndsAt: e.graceEndsAt,
  };
}

export type FacilityRow = {
  id: string; name: string; createdAt: Date; isDemo: boolean; timezone: string;
  rev: number; lastBackup: string; backupAgeDays: number | null;
  plan: string; planNote: string;
  planView: PlanView;
  users: number; staff: number; items: number; issues: number; requests: number;
  groups: number; setUp: boolean;
  state: "live" | "dormant" | "unconfigured" | "demo";
};

/** "YYYY-MM-DD" in the facility's zone → whole days ago, or null when never. */
function ageDays(lastBackup: string): number | null {
  if (!lastBackup) return null;
  const t = Date.parse(lastBackup + "T00:00:00Z");
  return Number.isFinite(t) ? Math.max(0, Math.floor((Date.now() - t) / DAY)) : null;
}

function stateOf(f: { isDemo: boolean; rev: number; staffGroups: string[] }): FacilityRow["state"] {
  if (f.isDemo) return "demo";
  if (f.staffGroups.length === 0) return "unconfigured";
  return f.rev > 0 ? "live" : "dormant";
}

export async function facilities(): Promise<FacilityRow[]> {
  const rows = await opsDb().facility.findMany({
    select: { ...FACILITY_COLS, _count: { select: { users: true, staff: true, items: true, issues: true, requests: true } } },
    orderBy: { createdAt: "desc" },
  });
  return rows.map((f) => ({
    id: f.id, name: f.name, createdAt: f.createdAt, isDemo: f.isDemo, timezone: f.timezone,
    rev: f.rev, lastBackup: f.lastBackup, backupAgeDays: ageDays(f.lastBackup), plan: f.plan, planNote: f.planNote, planView: planView(f),
    users: f._count.users, staff: f._count.staff, items: f._count.items, issues: f._count.issues, requests: f._count.requests,
    groups: f.staffGroups.length, setUp: f.staffGroups.length > 0,
    state: stateOf(f),
  }));
}

export type FacilityDetail = FacilityRow & {
  config: {
    capSets: number; initialSets: number; defaultEntitlement: number; defaultReorder: number;
    exceptionHigh: number; varianceReason: number;
    fteGroups: number; kitGroups: number; groups: number;
    glAccountSet: boolean; journalDesc: string; barcodeLookup: boolean; slipOrgSet: boolean;
    sso: "off" | "optional" | "required"; ssoStaff: boolean;
  };
  counts: {
    users: number; admins: number; usersWith2fa: number; inactiveUsers: number;
    staff: number; activeStaff: number; staffAccounts: number; accountsSeen7d: number;
    items: number; issues: number; orders: number; requests: number; events24h: number;
  };
  seq: { orders: number; catalogue: number; requests: number; barcodes: number };
};

export async function facility(id: string): Promise<FacilityDetail | null> {
  const db = opsDb();
  const f = await db.facility.findUnique({ where: { id }, select: FACILITY_COLS });
  if (!f) return null;
  const since7d = new Date(Date.now() - 7 * DAY);
  const since24h = new Date(Date.now() - DAY);
  const [users, admins, usersWith2fa, inactiveUsers, staff, activeStaff, staffAccounts, accountsSeen7d, items, issues, orders, requests, events24h] = await Promise.all([
    db.user.count({ where: { facilityId: id } }),
    db.user.count({ where: { facilityId: id, role: "ADMIN", inactive: false } }),
    db.user.count({ where: { facilityId: id, totpEnabledAt: { not: null } } }),
    db.user.count({ where: { facilityId: id, inactive: true } }),
    db.staff.count({ where: { facilityId: id } }),
    db.staff.count({ where: { facilityId: id, inactive: false } }),
    db.staffAccount.count({ where: { facilityId: id } }),
    db.staffAccount.count({ where: { facilityId: id, lastSeenAt: { gte: since7d } } }),
    db.catalogItem.count({ where: { facilityId: id } }),
    db.issue.count({ where: { facilityId: id } }),
    db.order.count({ where: { facilityId: id } }),
    db.request.count({ where: { facilityId: id } }),
    db.auditEvent.count({ where: { facilityId: id, at: { gte: since24h } } }),
  ]);
  return {
    id: f.id, name: f.name, createdAt: f.createdAt, isDemo: f.isDemo, timezone: f.timezone,
    rev: f.rev, lastBackup: f.lastBackup, backupAgeDays: ageDays(f.lastBackup), plan: f.plan, planNote: f.planNote, planView: planView(f),
    users, staff, items, issues, requests,
    groups: f.staffGroups.length, setUp: f.staffGroups.length > 0, state: stateOf(f),
    config: {
      capSets: f.capSets, initialSets: f.initialSets, defaultEntitlement: f.defaultEntitlement,
      defaultReorder: f.defaultReorder, exceptionHigh: f.exceptionHigh, varianceReason: f.varianceReason,
      fteGroups: f.nursingGroups.length, kitGroups: f.kitGroups.length, groups: f.staffGroups.length,
      glAccountSet: !!f.glAccount, journalDesc: f.journalDesc, barcodeLookup: f.barcodeLookup, slipOrgSet: !!f.slipOrg,
      sso: f.ssoEnabled ? (f.ssoRequired ? "required" : "optional") : "off", ssoStaff: f.ssoStaff,
    },
    counts: { users, admins, usersWith2fa, inactiveUsers, staff, activeStaff, staffAccounts, accountsSeen7d, items, issues, orders, requests, events24h },
    seq: { orders: f.orderSeq, catalogue: f.catalogSeq, requests: f.requestSeq, barcodes: f.barcodeSeq },
  };
}

export type Overview = {
  facilities: number; live: number; dormant: number; unconfigured: number; demo: number;
  signupsThisMonth: number; reachedFirstIssue: number;
  overdueBackups: FacilityRow[]; neverIssued: FacilityRow[]; unconfiguredList: FacilityRow[];
  enquiriesUnhandled: number;
  migrations: { applied: number; inRepo: number };
  demoRebuiltAgoMin: number | null;
};

/** How many migration folders the repo ships, read from disk on the box that is running. */
function migrationsInRepo(): number {
  try {
    return readdirSync(path.join(process.cwd(), "prisma", "migrations"), { withFileTypes: true }).filter((d) => d.isDirectory()).length;
  } catch { return 0; }
}

export async function overview(): Promise<Overview> {
  const db = opsDb();
  const all = await facilities();
  const real = all.filter((f) => !f.isDemo);
  const monthStart = new Date(); monthStart.setUTCDate(1); monthStart.setUTCHours(0, 0, 0, 0);
  const [enquiriesUnhandled, appliedRows, demo] = await Promise.all([
    db.contactMessage.count({ where: { handled: false } }),
    db.$queryRaw<{ n: bigint }[]>`SELECT count(*)::bigint AS n FROM "_prisma_migrations" WHERE "finished_at" IS NOT NULL AND "rolled_back_at" IS NULL`,
    db.facility.findFirst({ where: { isDemo: true }, select: { demoResetAt: true } }),
  ]);
  const signups = real.filter((f) => f.createdAt >= monthStart);
  return {
    facilities: real.length,
    live: real.filter((f) => f.state === "live").length,
    dormant: real.filter((f) => f.state === "dormant").length,
    unconfigured: real.filter((f) => f.state === "unconfigured").length,
    demo: all.length - real.length,
    signupsThisMonth: signups.length,
    reachedFirstIssue: signups.filter((f) => f.issues > 0).length,
    // Overdue: live facilities with no export in seven days, or never — the figure the Terms used to promise a reminder on.
    overdueBackups: real.filter((f) => f.state === "live" && (f.backupAgeDays === null || f.backupAgeDays > 7)),
    neverIssued: real.filter((f) => f.state === "dormant"),
    unconfiguredList: real.filter((f) => f.state === "unconfigured"),
    enquiriesUnhandled,
    migrations: { applied: Number(appliedRows[0]?.n ?? 0), inRepo: migrationsInRepo() },
    demoRebuiltAgoMin: demo?.demoResetAt ? Math.floor((Date.now() - demo.demoResetAt.getTime()) / 60000) : null,
  };
}