import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { createTestDb } from "@parking/db/testing";
import { type Db } from "@parking/db";
import {
  ShiftService,
  ShiftAlreadyOpenError,
  NoOpenShiftError,
  NoShiftOpenError,
  InvalidCashMovementError,
} from "./shift-service.js";
import type { EventLog } from "./event-log.js";
import { makeLog, silentLogger } from "./test-helpers.js";

// The shift is an operator's accountability period — signed shift_open … shift_z_report,
// no mutable table. These tests pin: the site-wide single-open invariant, the takings
// SPLIT by source (subscription sales vs out-of-window charges vs transient tickets — the
// 2026-06-21 work), the drawer carry-forward, and that close signs a Z-report with the
// right figures.

let db: Db;
let close: () => void;
let log: EventLog;
let shift: ShiftService;

beforeEach(() => {
  const t = createTestDb();
  db = t.db;
  close = t.close;
  log = makeLog(db);
  shift = new ShiftService(db, log, silentLogger());
});
afterEach(() => close());

/** Append a signed payment with source-split flags, as the booth/pay paths do. */
async function payment(
  amountMinor: number,
  opts: { tender?: "cash" | "card"; subscriptionSale?: boolean; subscriptionWindowCharge?: boolean } = {},
) {
  await log.append({
    type: "payment", source: "manual", identity: "T",
    payload: {
      sessionRef: "T", amountMinor, currency: "ALL", tender: opts.tender ?? "cash",
      ...(opts.subscriptionSale ? { subscriptionSale: true } : {}),
      ...(opts.subscriptionWindowCharge ? { subscriptionWindowCharge: true } : {}),
    },
  });
}

describe("single-open invariant", () => {
  it("opens a shift and reports it as the current open one", async () => {
    await shift.open("alice");
    const cur = shift.currentOpenShift();
    expect(cur?.identity).toBe("alice");
  });

  it("refuses a second open while one is already open (even another operator)", async () => {
    await shift.open("alice");
    await expect(shift.open("alice")).rejects.toBeInstanceOf(ShiftAlreadyOpenError);
    await expect(shift.open("bob")).rejects.toBeInstanceOf(ShiftAlreadyOpenError);
  });

  it("allows a new shift after the prior one closes", async () => {
    await shift.open("alice");
    await shift.close("alice");
    await expect(shift.open("bob")).resolves.toBeTruthy();
  });

  it("close without an open shift throws", async () => {
    await expect(shift.close("alice")).rejects.toBeInstanceOf(NoOpenShiftError);
  });

  it("requireOpenShift throws when none is open", () => {
    expect(() => shift.requireOpenShift()).toThrow(NoShiftOpenError);
  });
});

describe("takings split by source", () => {
  it("separates subscription sales, out-of-window charges, and transient tickets", async () => {
    await shift.open("alice");
    await payment(50000, { subscriptionSale: true }); // monthly fee
    await payment(20000, { subscriptionWindowCharge: true }); // out-of-window
    await payment(10000); // transient ticket
    await payment(30000, { tender: "card" }); // transient ticket, card

    const r = shift.currentReport()!;
    expect(r.subscriptionSalesMinor).toBe(50000);
    expect(r.subscriptionWindowMinor).toBe(20000);
    expect(r.subscriptionTotalMinor).toBe(70000);
    expect(r.ticketTotalMinor).toBe(40000); // 10000 cash + 30000 card
    // The split must reconcile to the cash+card grand total.
    expect(r.cashTotalMinor + r.cardTotalMinor).toBe(
      r.ticketTotalMinor + r.subscriptionTotalMinor,
    );
    expect(r.cashTotalMinor).toBe(80000); // 50000 + 20000 + 10000
    expect(r.cardTotalMinor).toBe(30000);
  });
});

describe("drawer carry-forward", () => {
  it("cash payments enter the drawer; card does not", async () => {
    await shift.open("alice");
    await payment(10000, { tender: "cash" });
    await payment(50000, { tender: "card" });
    const r = shift.currentReport()!;
    expect(r.cashTotalMinor).toBe(10000);
    // Expected drawer = opening(0) + cash(10000) + added(0) − removed(0).
    expect(r.expectedDrawerMinor).toBe(10000);
  });

  it("a closed shift's expected drawer becomes the next shift's opening float", async () => {
    await shift.open("alice");
    await payment(25000, { tender: "cash" });
    const closed = await shift.close("alice");
    expect(closed.expectedDrawerMinor).toBe(25000);

    const next = await shift.open("bob");
    expect(next.openingFloatMinor).toBe(25000); // inherited
  });

  it("cash_in / cash_out movements adjust the drawer", async () => {
    await shift.open("alice");
    await shift.recordVoucher({ type: "cash_in", operator: "alice", amountMinor: 100000, reason: "float load" });
    await shift.recordVoucher({ type: "cash_out", operator: "alice", amountMinor: 30000, reason: "bank drop" });
    const r = shift.currentReport()!;
    expect(r.cashAddedMinor).toBe(100000);
    expect(r.cashRemovedMinor).toBe(30000);
    expect(r.expectedDrawerMinor).toBe(70000);
  });

  it("rejects a non-positive movement amount", async () => {
    await shift.open("alice");
    await expect(
      shift.recordVoucher({ type: "cash_in", operator: "alice", amountMinor: 0, reason: "x" }),
    ).rejects.toBeInstanceOf(InvalidCashMovementError);
    await expect(
      shift.recordVoucher({ type: "cash_out", operator: "alice", amountMinor: -5, reason: "x" }),
    ).rejects.toBeInstanceOf(InvalidCashMovementError);
  });
});

describe("drawer review (operator records, admin reviews after)", () => {
  it("a new movement starts pending; review sets authorized/denied", async () => {
    await shift.open("alice");
    const m = await shift.recordVoucher({ type: "cash_out", operator: "alice", amountMinor: 5000, reason: "supplies" });
    // Find the movement's ledger id via the status list.
    let list = shift.movementsWithStatus({ operator: "alice" });
    expect(list).toHaveLength(1);
    expect(list[0].status).toBe("pending");
    expect(list[0].voucherNo).toBe(m.voucherNo);

    await shift.reviewMovement({ refId: list[0].id, decision: "deny", reviewedBy: "admin", note: "not genuine" });
    list = shift.movementsWithStatus({ operator: "alice" });
    expect(list[0].status).toBe("denied");
    expect(list[0].reviewedBy).toBe("admin");
    expect(list[0].reviewNote).toBe("not genuine");
  });

  it("DENY is a flag only — it does NOT reverse the movement or touch the drawer", async () => {
    await shift.open("alice");
    await shift.recordVoucher({ type: "cash_out", operator: "alice", amountMinor: 10000, reason: "x" });
    const before = shift.drawerBalance().balanceMinor;
    expect(before).toBe(-10000); // the disbursement counted immediately
    const id = shift.movementsWithStatus({ operator: "alice" })[0].id;
    await shift.reviewMovement({ refId: id, decision: "deny", reviewedBy: "admin" });
    // Balance UNCHANGED by the denial — the correction is settled outside the app.
    expect(shift.drawerBalance().balanceMinor).toBe(-10000);
  });

  it("a denied movement in a CLOSED shift never leaks into the next operator's drawer", async () => {
    // The regression that motivated the redesign: op1 disburses, shift closes, op2
    // inherits; op1's disbursement is later DENIED. op2's drawer must be untouched.
    await shift.open("op1");
    await shift.recordVoucher({ type: "cash_out", operator: "op1", amountMinor: 10000, reason: "questionable" });
    const closed = await shift.close("op1");
    expect(closed.expectedDrawerMinor).toBe(-10000);

    const next = await shift.open("op2");
    expect(next.openingFloatMinor).toBe(-10000); // op2 inherits the real till balance

    const id = shift.movementsWithStatus({ operator: "op1" })[0].id;
    await shift.reviewMovement({ refId: id, decision: "deny", reviewedBy: "admin" });

    // op2's drawer is STILL -10000 — the denial added no reversing cash.
    expect(shift.drawerBalance().balanceMinor).toBe(-10000);
    expect(shift.currentReport()!.openingFloatMinor).toBe(-10000);
  });

  it("rejects reviewing a non-movement or an already-reviewed movement", async () => {
    await shift.open("alice");
    await shift.recordVoucher({ type: "cash_in", operator: "alice", amountMinor: 5000, reason: "x" });
    const id = shift.movementsWithStatus({ operator: "alice" })[0].id;
    await expect(
      shift.reviewMovement({ refId: "not-a-real-id", decision: "authorize", reviewedBy: "admin" }),
    ).rejects.toBeInstanceOf(InvalidCashMovementError);
    await shift.reviewMovement({ refId: id, decision: "authorize", reviewedBy: "admin" });
    await expect(
      shift.reviewMovement({ refId: id, decision: "deny", reviewedBy: "admin" }),
    ).rejects.toBeInstanceOf(InvalidCashMovementError); // already reviewed
  });

  it("scopes movements by operator", async () => {
    await shift.open("alice");
    await shift.recordVoucher({ type: "cash_in", operator: "alice", amountMinor: 1000, reason: "a" });
    await shift.close("alice");
    await shift.open("bob");
    await shift.recordVoucher({ type: "cash_out", operator: "bob", amountMinor: 2000, reason: "b" });
    expect(shift.movementsWithStatus({ operator: "alice" })).toHaveLength(1);
    expect(shift.movementsWithStatus({ operator: "bob" })).toHaveLength(1);
    expect(shift.movementsWithStatus()).toHaveLength(2); // reviewer sees all
    expect(shift.movementsWithStatus({ status: "pending" })).toHaveLength(2);
  });
});

describe("close signs a Z-report; listShifts reads it back", () => {
  it("a closed shift appears in history with its split figures", async () => {
    await shift.open("alice");
    await payment(50000, { subscriptionSale: true });
    await payment(10000); // ticket
    await shift.close("alice");

    const history = shift.listShifts();
    expect(history).toHaveLength(1);
    const s = history[0];
    expect(s.operator).toBe("alice");
    expect(s.subscriptionSalesMinor).toBe(50000);
    expect(s.ticketTotalMinor).toBe(10000);
    expect(s.cashTotalMinor).toBe(60000);
    // The Z-report is a signed chain event.
    expect(log.verifyChain()).toEqual({ ok: true });
  });

  it("filters history by operator", async () => {
    await shift.open("alice"); await shift.close("alice");
    await shift.open("bob"); await shift.close("bob");
    expect(shift.listShifts({ operator: "alice" }).map((s) => s.operator)).toEqual(["alice"]);
  });

  it("listOperators: distinct + sorted, includes the OPEN shift's operator", async () => {
    await shift.open("bob"); await shift.close("bob");
    await shift.open("bob"); await shift.close("bob"); // twice — must stay distinct
    await shift.open("alice"); // open, no z-report yet
    expect(shift.listOperators()).toEqual(["alice", "bob"]);
  });
});

describe("tills: one shift per till, one drawer per till", () => {
  /** A bay payment as the Car Wash module signs it (till = carwash). */
  async function bayPayment(amountMinor: number, tender: "cash" | "card" = "cash") {
    await log.append({
      type: "carwash_payment", source: "manual", identity: "T",
      payload: { sessionRef: "T", orderId: "o1", amountMinor, currency: "ALL", tender, till: "carwash" },
    });
  }

  it("the booth and the carwash till can both be open at once, by different operators", async () => {
    await shift.open("alice");
    await expect(shift.open("wanda", "carwash")).resolves.toMatchObject({ till: "carwash" });
    expect(shift.currentOpenShift()?.identity).toBe("alice");
    expect(shift.currentOpenShift("carwash")?.identity).toBe("wanda");
    // Each till keeps its own single-open rule.
    await expect(shift.open("bob", "carwash")).rejects.toBeInstanceOf(ShiftAlreadyOpenError);
    await expect(shift.open("bob")).rejects.toBeInstanceOf(ShiftAlreadyOpenError);
  });

  it("requireOpenShift is per till: a booth shift does not cover the bay", async () => {
    await shift.open("alice");
    expect(() => shift.requireOpenShift("carwash")).toThrow(NoShiftOpenError);
    await shift.open("wanda", "carwash");
    expect(shift.requireOpenShift("carwash").identity).toBe("wanda");
  });

  it("money folds into ITS till only: bay cash is the wash operator's, not the booth's", async () => {
    await shift.open("alice");
    await shift.open("wanda", "carwash");
    await payment(10000); // booth (payment events carry till=booth or nothing)
    await bayPayment(70000);
    await bayPayment(20000, "card");

    const booth = shift.currentReport()!;
    expect(booth.till).toBe("booth");
    expect(booth.cashTotalMinor).toBe(10000);
    expect(booth.paymentCount).toBe(1);
    expect(booth.expectedDrawerMinor).toBe(10000);

    const wash = shift.currentReport("carwash")!;
    expect(wash.till).toBe("carwash");
    expect(wash.cashTotalMinor).toBe(70000);
    expect(wash.cardTotalMinor).toBe(20000);
    expect(wash.paymentCount).toBe(2);
    expect(wash.expectedDrawerMinor).toBe(70000);

    expect(shift.drawerBalance().balanceMinor).toBe(10000);
    expect(shift.drawerBalance("carwash").balanceMinor).toBe(70000);
  });

  it("vouchers name their till; each till's expected drawer carries forward on its own", async () => {
    await shift.open("alice");
    await shift.open("wanda", "carwash");
    await shift.recordVoucher({ type: "cash_in", operator: "wanda", amountMinor: 5000, reason: "float", till: "carwash" });
    await shift.recordVoucher({ type: "cash_in", operator: "alice", amountMinor: 100000, reason: "float" });
    await bayPayment(70000);
    expect(shift.movementsWithStatus({ till: "carwash" }).map((m) => m.amountMinor)).toEqual([5000]);

    const washZ = await shift.close("wanda", "carwash");
    expect(washZ).toMatchObject({ till: "carwash", cashAddedMinor: 5000, cashTotalMinor: 70000, expectedDrawerMinor: 75000 });
    const boothZ = await shift.close("alice");
    expect(boothZ).toMatchObject({ till: "booth", cashAddedMinor: 100000, cashTotalMinor: 0, expectedDrawerMinor: 100000 });

    // Next shift on each till inherits that till's drawer only.
    expect((await shift.open("wanda", "carwash")).openingFloatMinor).toBe(75000);
    expect((await shift.open("bob")).openingFloatMinor).toBe(100000);
  });

  it("close is per till: closing the booth never closes the wash desk", async () => {
    await shift.open("alice");
    await shift.open("alice", "carwash");
    await shift.close("alice");
    expect(shift.currentOpenShift()).toBeNull();
    expect(shift.currentOpenShift("carwash")?.identity).toBe("alice");
    await expect(shift.close("alice")).rejects.toBeInstanceOf(NoOpenShiftError);
  });

  it("history lists both tills, filterable; pre-till reports read as booth", async () => {
    await shift.open("alice");
    await shift.open("wanda", "carwash");
    await shift.close("wanda", "carwash");
    await shift.close("alice");
    const all = shift.listShifts();
    expect(all.map((s) => s.till).sort()).toEqual(["booth", "carwash"]);
    expect(shift.listShifts({ till: "carwash" }).map((s) => s.operator)).toEqual(["wanda"]);
    expect(shift.listShifts({ till: "booth" }).map((s) => s.operator)).toEqual(["alice"]);
    expect(shift.listOperators("carwash")).toEqual(["wanda"]);
  });
});