import type { FastifyInstance } from "fastify";
import type { Db } from "@parking/db";
import type { TillId } from "@parking/shared";
import { requireAuth, requirePermission, roleHasPermissions } from "../auth.js";
import { parseTill, requireTill, tillsReadableBy } from "../modules.js";
import { InvalidCashMovementError, type MovementStatus, type ShiftService } from "../shift-service.js";

// Drawer cash movements (manned mode). Redesigned 2026-07-01: an operator RECORDS a
// receipt/disbursement FREELY (no admin sign-off at creation); an admin REVIEWS it after
// the fact (authorize/deny — a flag that never moves cash). See wiki/concepts/shift.md.
//   - POST /api/drawer/movement : operator records a cash_in/cash_out on a till.
//                                  Guard = the till's `cash` (booth drawer:create,
//                                  wash carwash:cash).
//   - GET  /api/drawer/movements: list with review status, over the tills the role may
//                                  read (own movements); reviewers (drawer:review) see all
//                                  tills + all operators and can filter status.
//   - POST /api/drawer/review   : admin authorize/deny a movement.        (drawer:review)
//   - GET  /api/drawer/balance  : a till's physical balance NOW (guard = the till's read).
// The drawer BALANCE math is unchanged — a movement counts immediately; a denial is a
// judgment about the operator settled outside the app, never a cash reversal.
// TILLS: a movement names the drawer it moved in/out of (`till`, default booth); each
// desk's cash is guarded by that desk's own permissions (venue-modules.md §"Permissions
// matrix").

interface MovementBody {
  /** Direction is the document TYPE, not a sign: cash_in = Mandat Arkëtimi (pay-IN),
   *  cash_out = Mandat Pagese (pay-OUT). */
  type: "cash_in" | "cash_out";
  /** POSITIVE minor units (magnitude). The direction comes from `type`. */
  amountMinor: number;
  reason?: string;
  currency?: string;
  /** Which drawer (default: the booth). */
  till?: string;
}

interface ReviewBody {
  /** The cash_in/cash_out event id being decided on. */
  refId: string;
  decision: "authorize" | "deny";
  /** Optional admin note (e.g. why denied). */
  note?: string;
}

interface MovementsQuery {
  /** Reviewers only: filter to pending/authorized/denied. Ignored for non-reviewers. */
  status?: MovementStatus;
  /** Filter to one till; absent = every till the role may read (reviewers: every till). */
  till?: string;
}

export async function drawerRoutes(app: FastifyInstance, db: Db, shift: ShiftService): Promise<void> {
  const reviewGuard = requirePermission("drawer:review");

  // Operator RECORDS a movement — freely, no authorizer. It counts in the drawer at once.
  app.post<{ Body: MovementBody }>("/api/drawer/movement", { preHandler: requireTill(db, "cash", "body") }, async (req, reply) => {
    const b = req.body ?? ({} as MovementBody);
    if (b.type !== "cash_in" && b.type !== "cash_out") {
      return reply.code(400).send({ error: "type must be cash_in or cash_out" });
    }
    try {
      return await shift.recordVoucher({
        type: b.type,
        operator: req.user.username,
        amountMinor: b.amountMinor,
        reason: b.reason ?? "",
        currency: b.currency,
        till: req.till!,
      });
    } catch (err) {
      if (err instanceof InvalidCashMovementError) return reply.code(400).send({ error: err.message });
      return reply.code(500).send({ error: (err as Error).message });
    }
  });

  // List movements + review status. Operators are hard-scoped to their OWN movements on
  // the tills they may read; a reviewer sees ALL and may filter by status (the pending
  // review queue).
  app.get<{ Querystring: MovementsQuery }>("/api/drawer/movements", { preHandler: requireAuth }, async (req, reply) => {
    const canReview = roleHasPermissions(req.user.roleId, ["drawer:review"]);
    const readable = tillsReadableBy(db, req.user.roleId);
    if (!canReview && readable.length === 0) return reply.code(403).send({ error: "forbidden" });
    const q = req.query ?? {};
    const status = canReview && ["pending", "authorized", "denied"].includes(q.status ?? "") ? q.status : undefined;
    let tills: TillId[] | undefined = canReview ? undefined : readable;
    if (q.till?.trim()) {
      const parsed = parseTill(db, q.till.trim());
      if (!parsed) return reply.code(400).send({ error: "unknown till", code: "bad_till" });
      if (!canReview && !readable.includes(parsed)) {
        return reply.code(403).send({ error: `your role cannot see the ${parsed} till`, code: "till_forbidden", till: parsed });
      }
      tills = [parsed];
    }
    const operator = canReview ? undefined : req.user.username;
    const movements = tills
      ? tills.flatMap((till) => shift.movementsWithStatus({ operator, status, till })).sort((a, b) => (a.at < b.at ? 1 : a.at > b.at ? -1 : 0))
      : shift.movementsWithStatus({ operator, status });
    return { movements, scope: canReview ? "all" : "self" };
  });

  // A till's physical drawer balance now. Same visibility as the open shift's X-report
  // (the till's read guard) — a drawer is a shared till, not per-operator data.
  app.get("/api/drawer/balance", { preHandler: requireTill(db, "read", "query") }, async (req) => ({
    till: req.till!,
    ...shift.drawerBalance(req.till!),
  }));

  // Admin AUTHORIZES or DENIES a recorded movement. A flag only — no cash reversal.
  app.post<{ Body: ReviewBody }>("/api/drawer/review", { preHandler: reviewGuard }, async (req, reply) => {
    const b = req.body ?? ({} as ReviewBody);
    if (!b.refId || (b.decision !== "authorize" && b.decision !== "deny")) {
      return reply.code(400).send({ error: "refId and decision (authorize|deny) are required" });
    }
    try {
      return await shift.reviewMovement({
        refId: b.refId,
        decision: b.decision,
        reviewedBy: req.user.username,
        note: b.note,
      });
    } catch (err) {
      if (err instanceof InvalidCashMovementError) return reply.code(400).send({ error: err.message });
      return reply.code(500).send({ error: (err as Error).message });
    }
  });
}