import { beforeEach, describe, expect, it, vi } from "vitest";
import type { Mock } from "vitest";
import type { Session } from "next-auth";
import {
  createAssetCategory,
  listAssetCategories,
  validateCreateAssetCategoryInput,
} from "@/lib/asset-categories";
import { prisma } from "@/lib/prisma";

// Note: this file has two layers of coverage, mirroring tests/vendors.test.ts:
// - lib-level tests below exercise src/lib/asset-categories.ts directly
//   (validation, valueGroup enum, list ordering).
// - route-level tests (further down) exercise
//   src/app/api/asset-categories/route.ts over HTTP, including the auth()
//   gate — mirrors tests/vendors.test.ts's @/auth mocking pattern.
vi.mock("@/auth", () => ({ auth: vi.fn() }));

import { GET, POST } from "@/app/api/asset-categories/route";
import { auth } from "@/auth";

const mockedAuth = auth as unknown as Mock<() => Promise<Session | null>>;

const testSession: Session = {
  user: { id: "test-user-id" },
  expires: new Date(Date.now() + 60 * 60 * 1000).toISOString(),
};

function postRequest(body: unknown): Request {
  return new Request("http://localhost/api/asset-categories", {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify(body),
  });
}

beforeEach(async () => {
  // Each test starts from an empty table so listing/order assertions are
  // deterministic.
  await prisma.assetCategory.deleteMany();
  // Default to a logged-in session — the lib-level tests below don't go
  // through the route at all (so this is a no-op for them), and the
  // route-level tests exercise business logic, not auth gating (that's
  // covered by the "auth gating" describe block further down).
  mockedAuth.mockResolvedValue(testSession);
});

describe("validateCreateAssetCategoryInput", () => {
  it("accepts a valid high_value category", () => {
    const result = validateCreateAssetCategoryInput({
      name: "Laptop",
      valueGroup: "high_value",
    });

    expect(result.ok).toBe(true);
    if (result.ok) {
      expect(result.value).toMatchObject({ name: "Laptop", valueGroup: "high_value" });
    }
  });

  it("accepts a valid low_value category", () => {
    const result = validateCreateAssetCategoryInput({
      name: "Cáp HDMI",
      valueGroup: "low_value",
    });

    expect(result.ok).toBe(true);
    if (result.ok) {
      expect(result.value).toMatchObject({ name: "Cáp HDMI", valueGroup: "low_value" });
    }
  });

  it("rejects an empty name", () => {
    const result = validateCreateAssetCategoryInput({
      name: "",
      valueGroup: "high_value",
    });

    expect(result.ok).toBe(false);
    if (!result.ok) {
      expect(result.error).toMatch(/name/i);
    }
  });

  it("rejects a missing name", () => {
    const result = validateCreateAssetCategoryInput({
      valueGroup: "high_value",
    });

    expect(result.ok).toBe(false);
    if (!result.ok) {
      expect(result.error).toMatch(/name/i);
    }
  });

  it("rejects an invalid valueGroup", () => {
    const result = validateCreateAssetCategoryInput({
      name: "Laptop",
      valueGroup: "medium_value",
    });

    expect(result.ok).toBe(false);
    if (!result.ok) {
      expect(result.error).toMatch(/valueGroup/i);
    }
  });

  it("rejects a missing valueGroup", () => {
    const result = validateCreateAssetCategoryInput({
      name: "Laptop",
    });

    expect(result.ok).toBe(false);
    if (!result.ok) {
      expect(result.error).toMatch(/valueGroup/i);
    }
  });
});

describe("createAssetCategory", () => {
  it("creates a high_value category", async () => {
    const result = validateCreateAssetCategoryInput({
      name: "Laptop",
      valueGroup: "high_value",
    });
    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const created = await createAssetCategory(result.value);

    expect(created.ok).toBe(true);
    if (!created.ok) return;
    expect(created.value).toMatchObject({ name: "Laptop", value_group: "high_value" });
    expect(typeof created.value.id).toBe("string");
    expect(created.value.id.length).toBeGreaterThan(0);
    expect(Number.isNaN(Date.parse(created.value.created_at))).toBe(false);
  });

  it("creates a low_value category", async () => {
    const result = validateCreateAssetCategoryInput({
      name: "Cáp HDMI",
      valueGroup: "low_value",
    });
    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const created = await createAssetCategory(result.value);

    expect(created.ok).toBe(true);
    if (!created.ok) return;
    expect(created.value).toMatchObject({ name: "Cáp HDMI", value_group: "low_value" });
  });
});

describe("listAssetCategories", () => {
  it("lists created categories, newest first", async () => {
    const first = validateCreateAssetCategoryInput({ name: "Cáp HDMI", valueGroup: "low_value" });
    expect(first.ok).toBe(true);
    if (first.ok) await createAssetCategory(first.value);

    // Ensure a distinct created_at ordering even on fast filesystems/clocks.
    await new Promise((resolve) => setTimeout(resolve, 5));

    const second = validateCreateAssetCategoryInput({ name: "Laptop", valueGroup: "high_value" });
    expect(second.ok).toBe(true);
    if (second.ok) await createAssetCategory(second.value);

    const records = await listAssetCategories();

    expect(records).toHaveLength(2);
    // newest first
    expect(records[0]).toMatchObject({ name: "Laptop" });
    expect(records[1]).toMatchObject({ name: "Cáp HDMI" });
  });

  it("returns an empty list when there are no categories", async () => {
    const records = await listAssetCategories();
    expect(records).toEqual([]);
  });
});

describe("POST /api/asset-categories", () => {
  it("creates a high_value category on valid input", async () => {
    const res = await POST(postRequest({ name: "Laptop", valueGroup: "high_value" }));

    expect(res.status).toBe(201);
    const body = await res.json();

    expect(body).toMatchObject({ name: "Laptop", value_group: "high_value" });
    expect(typeof body.id).toBe("string");
    expect(body.id.length).toBeGreaterThan(0);
    expect(Number.isNaN(Date.parse(body.created_at))).toBe(false);
  });

  it("creates a low_value category on valid input", async () => {
    const res = await POST(postRequest({ name: "Cáp HDMI", valueGroup: "low_value" }));

    expect(res.status).toBe(201);
    const body = await res.json();
    expect(body).toMatchObject({ name: "Cáp HDMI", value_group: "low_value" });
  });

  it("rejects an empty name", async () => {
    const res = await POST(postRequest({ name: "", valueGroup: "high_value" }));

    expect(res.status).toBe(400);
    const body = await res.json();
    expect(body.error).toMatch(/name/i);
  });

  it("rejects an invalid valueGroup", async () => {
    const res = await POST(postRequest({ name: "Laptop", valueGroup: "medium_value" }));

    expect(res.status).toBe(400);
    const body = await res.json();
    expect(body.error).toMatch(/valueGroup/i);
  });

  it("rejects a missing valueGroup", async () => {
    const res = await POST(postRequest({ name: "Laptop" }));

    expect(res.status).toBe(400);
    const body = await res.json();
    expect(body.error).toMatch(/valueGroup/i);
  });

  it("rejects an invalid JSON body", async () => {
    const req = new Request("http://localhost/api/asset-categories", {
      method: "POST",
      headers: { "content-type": "application/json" },
      body: "not json",
    });

    const res = await POST(req);
    expect(res.status).toBe(400);
    const body = await res.json();
    expect(body.error).toMatch(/JSON/i);
  });

  it("rejects a non-object JSON body", async () => {
    // Note: arrays are `typeof "object"` in JS, so they pass the route's
    // object check (same behavior as /api/vendors) — use a JSON string
    // primitive here to actually exercise the "not an object" branch.
    const res = await POST(postRequest("not an object"));

    expect(res.status).toBe(400);
    const body = await res.json();
    expect(body.error).toMatch(/JSON object/i);
  });
});

describe("GET /api/asset-categories", () => {
  it("lists created categories, newest first", async () => {
    await POST(postRequest({ name: "Cáp HDMI", valueGroup: "low_value" }));
    // Ensure a distinct created_at ordering even on fast filesystems/clocks.
    await new Promise((resolve) => setTimeout(resolve, 5));
    await POST(postRequest({ name: "Laptop", valueGroup: "high_value" }));

    const res = await GET();
    expect(res.status).toBe(200);

    const body = await res.json();
    expect(Array.isArray(body)).toBe(true);
    expect(body).toHaveLength(2);

    // newest first
    expect(body[0]).toMatchObject({ name: "Laptop" });
    expect(body[1]).toMatchObject({ name: "Cáp HDMI" });
  });

  it("returns an empty list when there are no categories", async () => {
    const res = await GET();
    expect(res.status).toBe(200);
    const body = await res.json();
    expect(body).toEqual([]);
  });
});

describe("auth gating on /api/asset-categories", () => {
  // Mirrors tests/vendors.test.ts's "auth gating" block — only checks
  // session presence, per the flat permission model (no role/permission
  // logic).
  it("POST /api/asset-categories returns 401 without a session", async () => {
    mockedAuth.mockResolvedValue(null);

    const res = await POST(postRequest({ name: "Laptop", valueGroup: "high_value" }));

    expect(res.status).toBe(401);
    const body = await res.json();
    expect(body).toEqual({ error: "Unauthorized" });

    // And it must not have created anything.
    const remaining = await prisma.assetCategory.findMany();
    expect(remaining).toHaveLength(0);
  });

  it("GET /api/asset-categories returns 401 without a session", async () => {
    mockedAuth.mockResolvedValue(null);

    const res = await GET();

    expect(res.status).toBe(401);
    const body = await res.json();
    expect(body).toEqual({ error: "Unauthorized" });
  });
});