import { describe, it, expect, beforeEach, afterEach } from "vitest";
import {
  generateSharedNumber,
  generateOfferNumber,
  previewSharedNumber,
  isSharedNumberTaken,
  previewOfferNumber,
  isOfferNumberTaken,
} from "../services/numbering.service";
import prisma from "../config/database";

describe("generateSharedNumber", () => {
  beforeEach(async () => {
    await prisma.number_sequences.deleteMany({ where: { type: "shared" } });
  });

  afterEach(async () => {
    await prisma.number_sequences.deleteMany({ where: { type: "shared" } });
  });

  it("returns a non-empty string", async () => {
    const num = await generateSharedNumber();
    expect(typeof num).toBe("string");
    expect(num.length).toBeGreaterThan(0);
  });

  it("increments on consecutive calls", async () => {
    const num1 = await generateSharedNumber();
    const num2 = await generateSharedNumber();
    expect(num1).not.toBe(num2);
  });
});

describe("generateOfferNumber", () => {
  beforeEach(async () => {
    await prisma.number_sequences.deleteMany({ where: { type: "offer" } });
  });

  afterEach(async () => {
    await prisma.number_sequences.deleteMany({ where: { type: "offer" } });
  });

  it("returns a non-empty string", async () => {
    const num = await generateOfferNumber();
    expect(typeof num).toBe("string");
    expect(num.length).toBeGreaterThan(0);
  });

  it("increments on consecutive calls", async () => {
    const num1 = await generateOfferNumber();
    const num2 = await generateOfferNumber();
    expect(num1).not.toBe(num2);
  });
});

describe("previewSharedNumber", () => {
  let createdProjectId: number | null = null;

  beforeEach(async () => {
    await prisma.number_sequences.deleteMany({ where: { type: "shared" } });
  });

  afterEach(async () => {
    if (createdProjectId !== null) {
      await prisma.projects
        .delete({ where: { id: createdProjectId } })
        .catch(() => {});
      createdProjectId = null;
    }
    await prisma.number_sequences.deleteMany({ where: { type: "shared" } });
  });

  it("returns a number not already used by an order or project", async () => {
    const preview = await previewSharedNumber();
    expect(typeof preview).toBe("string");
    expect(await isSharedNumberTaken(preview)).toBe(false);
  });

  it("skips a number already taken when the sequence counter lags behind", async () => {
    // Fresh counter → preview points at the first sequence number. With the
    // skip-taken logic this is guaranteed free, so we can safely claim it.
    const first = await previewSharedNumber();
    const project = await prisma.projects.create({
      data: { project_number: first, name: "test-preview-skip-taken" },
    });
    createdProjectId = project.id;

    // The counter still lags behind (no row was consumed), but `first` is now
    // taken — the preview must advance past it instead of re-offering it.
    const second = await previewSharedNumber();
    expect(second).not.toBe(first);
    expect(await isSharedNumberTaken(second)).toBe(false);
  });
});

describe("previewOfferNumber", () => {
  let createdQuotationId: number | null = null;

  beforeEach(async () => {
    await prisma.number_sequences.deleteMany({ where: { type: "offer" } });
  });

  afterEach(async () => {
    if (createdQuotationId !== null) {
      await prisma.quotations
        .delete({ where: { id: createdQuotationId } })
        .catch(() => {});
      createdQuotationId = null;
    }
    await prisma.number_sequences.deleteMany({ where: { type: "offer" } });
  });

  it("returns a number not already used by a quotation", async () => {
    const preview = await previewOfferNumber();
    expect(typeof preview).toBe("string");
    expect(await isOfferNumberTaken(preview)).toBe(false);
  });

  it("skips a number already taken when the sequence counter lags behind", async () => {
    // Fresh counter → preview points at the first sequence number; with the
    // skip-taken logic it's guaranteed free, so we can claim it.
    const first = await previewOfferNumber();
    const quotation = await prisma.quotations.create({
      data: { quotation_number: first },
    });
    createdQuotationId = quotation.id;

    // The counter still lags, but `first` is now taken — the preview must
    // advance past it instead of re-offering it.
    const second = await previewOfferNumber();
    expect(second).not.toBe(first);
    expect(await isOfferNumberTaken(second)).toBe(false);
  });
});