import { beforeEach, describe, expect, it, vi } from "vitest";
import type { Mock } from "vitest";
import type { Session } from "next-auth";
import {
  createAssetModel,
  listAssetModels,
  validateCreateAssetModelInput,
} from "@/lib/asset-models";
import { prisma } from "@/lib/prisma";

// Note: this file has two layers of coverage, mirroring
// tests/asset-category-attribute-defs.test.ts:
// - lib-level tests below exercise src/lib/asset-models.ts directly
//   (validation, FK/business-rule error handling, list ordering).
// - route-level tests (further down) exercise
//   src/app/api/asset-models/route.ts over HTTP, including the auth() gate,
//   malformed JSON, and non-object bodies.
vi.mock("@/auth", () => ({ auth: vi.fn() }));

import { GET, POST } from "@/app/api/asset-models/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-models", {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify(body),
  });
}

// AssetModel.categoryId is a real FK to AssetCategory, and the referenced
// category must be valueGroup=high_value (see docs/
// asset-license-management.md's "Cập nhật 2026-08-02 (2)" section). Tests
// that need valid ids create real rows first and use their ids. Mirrors
// tests/asset-category-attribute-defs.test.ts's createTestAssetCategory()
// helper.
function createTestAssetCategory(
  overrides: { name?: string; valueGroup?: "high_value" | "low_value" } = {}
) {
  return prisma.assetCategory.create({
    data: {
      name: overrides.name ?? "Laptop",
      valueGroup: overrides.valueGroup ?? "high_value",
    },
  });
}

beforeEach(async () => {
  // Each test starts from empty tables so listing/order assertions are
  // deterministic. asset_models must be cleared before asset_categories
  // since it has an FK (ON DELETE RESTRICT) to it.
  await prisma.assetModel.deleteMany();
  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("validateCreateAssetModelInput", () => {
  it("accepts valid input with a non-trivial specs object", () => {
    const result = validateCreateAssetModelInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      manufacturer: "Dell",
      name: "Latitude 5420",
      specs: { ram_gb: 16, cpu: "i7-1165G7" },
    });

    expect(result.ok).toBe(true);
    if (result.ok) {
      expect(result.value).toMatchObject({
        categoryId: "11111111-1111-1111-1111-111111111111",
        manufacturer: "Dell",
        name: "Latitude 5420",
        specs: { ram_gb: 16, cpu: "i7-1165G7" },
      });
    }
  });

  it("defaults specs to {} when omitted", () => {
    const result = validateCreateAssetModelInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      manufacturer: "Dell",
      name: "Latitude 5420",
    });

    expect(result.ok).toBe(true);
    if (result.ok) {
      expect(result.value.specs).toEqual({});
    }
  });

  it("rejects a missing categoryId", () => {
    const result = validateCreateAssetModelInput({
      manufacturer: "Dell",
      name: "Latitude 5420",
    });

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

  it("rejects a categoryId that is not a valid UUID", () => {
    const result = validateCreateAssetModelInput({
      categoryId: "not-a-uuid",
      manufacturer: "Dell",
      name: "Latitude 5420",
    });

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

  it("rejects an empty manufacturer", () => {
    const result = validateCreateAssetModelInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      manufacturer: "",
      name: "Latitude 5420",
    });

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

  it("rejects an empty name", () => {
    const result = validateCreateAssetModelInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      manufacturer: "Dell",
      name: "",
    });

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

  it("rejects a specs value that is not a plain object", () => {
    const result = validateCreateAssetModelInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      manufacturer: "Dell",
      name: "Latitude 5420",
      specs: "not an object",
    });

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

  it("rejects a specs value that is an array", () => {
    const result = validateCreateAssetModelInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      manufacturer: "Dell",
      name: "Latitude 5420",
      specs: ["not", "an", "object"],
    });

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

describe("createAssetModel", () => {
  it("creates a model for a real high_value category, with a non-trivial specs object", async () => {
    const category = await createTestAssetCategory({ valueGroup: "high_value" });
    const result = validateCreateAssetModelInput({
      categoryId: category.id,
      manufacturer: "Dell",
      name: "Latitude 5420",
      specs: { ram_gb: 16, cpu: "i7-1165G7" },
    });
    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const created = await createAssetModel(result.value);

    expect(created.ok).toBe(true);
    if (!created.ok) return;
    expect(created.value).toMatchObject({
      category_id: category.id,
      manufacturer: "Dell",
      name: "Latitude 5420",
      specs: { ram_gb: 16, cpu: "i7-1165G7" },
    });
    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("defaults specs to {} in the created record when omitted", async () => {
    const category = await createTestAssetCategory({ valueGroup: "high_value" });
    const result = validateCreateAssetModelInput({
      categoryId: category.id,
      manufacturer: "Apple",
      name: "MacBook Pro 14",
    });
    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const created = await createAssetModel(result.value);

    expect(created.ok).toBe(true);
    if (!created.ok) return;
    expect(created.value.specs).toEqual({});
  });

  it("returns a clean error when categoryId doesn't reference an existing category", async () => {
    const result = validateCreateAssetModelInput({
      categoryId: "00000000-0000-0000-0000-000000000000",
      manufacturer: "Dell",
      name: "Latitude 5420",
    });
    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const created = await createAssetModel(result.value);
    expect(created.ok).toBe(false);
    if (created.ok) return;
    expect(created.error).toMatch(/categoryId/i);
    expect(created.error).toMatch(/does not reference an existing asset category/i);

    const remaining = await prisma.assetModel.findMany();
    expect(remaining).toHaveLength(0);
  });

  it("returns a distinct clean error when categoryId references an existing but low_value category", async () => {
    const category = await createTestAssetCategory({
      name: "Cáp HDMI",
      valueGroup: "low_value",
    });
    const result = validateCreateAssetModelInput({
      categoryId: category.id,
      manufacturer: "Dell",
      name: "Latitude 5420",
    });
    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const created = await createAssetModel(result.value);
    expect(created.ok).toBe(false);
    if (created.ok) return;
    expect(created.error).toMatch(/high_value/i);
    // Distinct message from the "doesn't exist at all" case.
    expect(created.error).not.toMatch(/does not reference an existing asset category/i);

    const remaining = await prisma.assetModel.findMany();
    expect(remaining).toHaveLength(0);
  });
});

describe("listAssetModels", () => {
  it("lists created models, newest first", async () => {
    const category = await createTestAssetCategory({ valueGroup: "high_value" });

    const first = validateCreateAssetModelInput({
      categoryId: category.id,
      manufacturer: "Dell",
      name: "Latitude 5420",
    });
    expect(first.ok).toBe(true);
    if (first.ok) await createAssetModel(first.value);

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

    const second = validateCreateAssetModelInput({
      categoryId: category.id,
      manufacturer: "Apple",
      name: "MacBook Pro 14",
    });
    expect(second.ok).toBe(true);
    if (second.ok) await createAssetModel(second.value);

    const records = await listAssetModels();

    expect(records).toHaveLength(2);
    // newest first
    expect(records[0]).toMatchObject({ name: "MacBook Pro 14" });
    expect(records[1]).toMatchObject({ name: "Latitude 5420" });
  });

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

describe("POST /api/asset-models", () => {
  it("creates a model on valid input", async () => {
    const category = await createTestAssetCategory({ valueGroup: "high_value" });
    const res = await POST(
      postRequest({
        categoryId: category.id,
        manufacturer: "Dell",
        name: "Latitude 5420",
        specs: { ram_gb: 16, cpu: "i7-1165G7" },
      })
    );

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

    expect(body).toMatchObject({
      category_id: category.id,
      manufacturer: "Dell",
      name: "Latitude 5420",
      specs: { ram_gb: 16, cpu: "i7-1165G7" },
    });
    expect(typeof body.id).toBe("string");
    expect(body.id.length).toBeGreaterThan(0);
    expect(Number.isNaN(Date.parse(body.created_at))).toBe(false);
  });

  it("defaults specs to {} when omitted from the request body", async () => {
    const category = await createTestAssetCategory({ valueGroup: "high_value" });
    const res = await POST(
      postRequest({
        categoryId: category.id,
        manufacturer: "Dell",
        name: "Latitude 5420",
      })
    );

    expect(res.status).toBe(201);
    const body = await res.json();
    expect(body.specs).toEqual({});
  });

  it("rejects a missing manufacturer", async () => {
    const category = await createTestAssetCategory({ valueGroup: "high_value" });
    const res = await POST(
      postRequest({
        categoryId: category.id,
        name: "Latitude 5420",
      })
    );

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

  it("rejects a categoryId that is a well-formed UUID but doesn't reference an existing category", async () => {
    const res = await POST(
      postRequest({
        categoryId: "00000000-0000-0000-0000-000000000000",
        manufacturer: "Dell",
        name: "Latitude 5420",
      })
    );

    expect(res.status).toBe(400);
    const body = await res.json();
    expect(body.error).toMatch(/categoryId/i);
    expect(body.error).toMatch(/does not reference an existing asset category/i);

    const remaining = await prisma.assetModel.findMany();
    expect(remaining).toHaveLength(0);
  });

  it("rejects a categoryId referencing an existing but low_value category, with a distinct 400", async () => {
    const category = await createTestAssetCategory({
      name: "Cáp HDMI",
      valueGroup: "low_value",
    });
    const res = await POST(
      postRequest({
        categoryId: category.id,
        manufacturer: "Dell",
        name: "Latitude 5420",
      })
    );

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

    const remaining = await prisma.assetModel.findMany();
    expect(remaining).toHaveLength(0);
  });

  it("rejects an invalid JSON body", async () => {
    const req = new Request("http://localhost/api/asset-models", {
      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/asset-category-attribute-defs) —
    // 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-models", () => {
  it("lists created models, newest first", async () => {
    const category = await createTestAssetCategory({ valueGroup: "high_value" });
    await POST(
      postRequest({
        categoryId: category.id,
        manufacturer: "Dell",
        name: "Latitude 5420",
      })
    );
    // Ensure a distinct created_at ordering even on fast filesystems/clocks.
    await new Promise((resolve) => setTimeout(resolve, 5));
    await POST(
      postRequest({
        categoryId: category.id,
        manufacturer: "Apple",
        name: "MacBook Pro 14",
      })
    );

    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: "MacBook Pro 14" });
    expect(body[1]).toMatchObject({ name: "Latitude 5420" });
  });

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

describe("auth gating on /api/asset-models", () => {
  // Mirrors tests/asset-category-attribute-defs.test.ts's "auth gating"
  // block — only checks session presence, per the flat permission model (no
  // role/permission logic).
  it("POST /api/asset-models returns 401 without a session", async () => {
    const category = await createTestAssetCategory({ valueGroup: "high_value" });
    mockedAuth.mockResolvedValue(null);

    const res = await POST(
      postRequest({
        categoryId: category.id,
        manufacturer: "Dell",
        name: "Latitude 5420",
      })
    );

    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.assetModel.findMany();
    expect(remaining).toHaveLength(0);
  });

  it("GET /api/asset-models 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" });
  });
});