import { describe, it, expect, beforeAll, afterAll } from "vitest";
import prisma from "../config/database";
import { confirmInventorySession } from "../services/warehouse.service";

/**
 * Pinning tests for audit finding C3: confirmInventorySession must be atomic.
 * A session whose item list contains a valid surplus line BEFORE a deficit
 * line that cannot be satisfied (no batches) must fail WITHOUT committing the
 * surplus item's corrective receipt/batch — and retries must not accumulate
 * phantom stock.
 */

const N = "wh_invconf_";

let itemAId: number; // surplus line (processed first — lower line id)
let itemBId: number; // deficit line with no batches -> selectFifoBatches throws
let sessionId: number;

/** Corrective receipts carry generated notes without our prefix — collect
 * them via their lines' items before deleting. */
async function cleanup() {
  const lines = await prisma.sklad_receipt_lines.findMany({
    where: { item: { name: { contains: N } } },
    select: { receipt_id: true },
  });
  const receiptIds = [...new Set(lines.map((l) => l.receipt_id))];
  await prisma.sklad_batches.deleteMany({
    where: { item: { name: { contains: N } } },
  });
  await prisma.sklad_receipt_lines.deleteMany({
    where: { item: { name: { contains: N } } },
  });
  if (receiptIds.length > 0) {
    await prisma.sklad_receipts.deleteMany({
      where: { id: { in: receiptIds } },
    });
  }
  await prisma.sklad_inventory_lines.deleteMany({
    where: { session: { notes: { contains: N } } },
  });
  await prisma.sklad_inventory_sessions.deleteMany({
    where: { notes: { contains: N } },
  });
  await prisma.sklad_items.deleteMany({ where: { name: { contains: N } } });
}

beforeAll(async () => {
  await cleanup();

  const itemA = await prisma.sklad_items.create({
    data: { name: `${N}surplus_item`, unit: "ks" },
  });
  itemAId = itemA.id;
  const itemB = await prisma.sklad_items.create({
    data: { name: `${N}deficit_item`, unit: "ks" },
  });
  itemBId = itemB.id;

  // Surplus line created first => lower id => processed first by the confirm
  // loop. Deficit line for an item with NO batches forces the FIFO throw.
  const session = await prisma.sklad_inventory_sessions.create({
    data: {
      notes: `${N}session`,
      items: {
        create: [
          { item_id: itemAId, system_qty: 0, actual_qty: 5, difference: 5 },
          { item_id: itemBId, system_qty: 3, actual_qty: 0, difference: -3 },
        ],
      },
    },
  });
  sessionId = session.id;
});

afterAll(async () => {
  await cleanup();
  await prisma.$disconnect();
});

describe("confirmInventorySession atomicity (audit C3)", () => {
  it("rolls back the surplus corrective receipt when a later deficit line fails", async () => {
    const result = await confirmInventorySession(sessionId);

    // The confirm must fail — item B has nothing to consume.
    expect("error" in result).toBe(true);
    if ("error" in result) {
      expect(result.status).toBe(400);
      expect(result.error).toContain(`ID ${itemBId}`);
    }

    // ...and item A's surplus writes must NOT have been committed.
    const receiptLines = await prisma.sklad_receipt_lines.findMany({
      where: { item_id: itemAId },
    });
    expect(receiptLines).toHaveLength(0);

    const batches = await prisma.sklad_batches.findMany({
      where: { item_id: itemAId },
    });
    expect(batches).toHaveLength(0);

    // The session itself stays DRAFT and unnumbered either way.
    const session = await prisma.sklad_inventory_sessions.findUnique({
      where: { id: sessionId },
    });
    expect(session?.status).toBe("DRAFT");
    expect(session?.session_number).toBeNull();
  });

  it("does not accumulate phantom stock when the failed confirm is retried", async () => {
    await confirmInventorySession(sessionId);
    await confirmInventorySession(sessionId);

    const batches = await prisma.sklad_batches.findMany({
      where: { item_id: itemAId },
    });
    expect(batches).toHaveLength(0);

    const receipts = await prisma.sklad_receipts.findMany({
      where: { notes: { contains: `inventarizace #${sessionId}` } },
    });
    expect(receipts).toHaveLength(0);
  });
});