import { beforeEach, describe, expect, it, vi } from "vitest";
import type { Mock } from "vitest";
import type { Session } from "next-auth";
import {
  createAssetCategoryAttributeDef,
  listAssetCategoryAttributeDefs,
  validateCreateAssetCategoryAttributeDefInput,
} from "@/lib/asset-category-attribute-defs";
import { prisma } from "@/lib/prisma";

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

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

// AssetCategoryAttributeDef.categoryId is a real FK to AssetCategory (see
// schema.prisma / src/lib/asset-category-attribute-defs.ts) — tests that
// need valid ids create real rows first and use their ids. Mirrors
// tests/purchase-orders.test.ts's createTestVendor()/createTestEmployee()
// helpers.
function createTestAssetCategory(overrides: { name?: string } = {}) {
  return prisma.assetCategory.create({
    data: {
      name: overrides.name ?? "Laptop",
      valueGroup: "high_value",
    },
  });
}

beforeEach(async () => {
  // Each test starts from empty tables so listing/order/uniqueness
  // assertions are deterministic. asset_category_attribute_defs must be
  // cleared before asset_categories since it has an FK (ON DELETE RESTRICT)
  // to it.
  await prisma.assetCategoryAttributeDef.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("validateCreateAssetCategoryAttributeDefInput", () => {
  it("accepts valid input", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });

    expect(result.ok).toBe(true);
    if (result.ok) {
      expect(result.value).toMatchObject({
        categoryId: "11111111-1111-1111-1111-111111111111",
        key: "ram_gb",
        label: "RAM (GB)",
        dataType: "number",
        required: true,
        sortOrder: 1,
      });
    }
  });

  it("accepts each of the four fixed dataType values", () => {
    for (const dataType of ["string", "number", "boolean", "date"] as const) {
      const result = validateCreateAssetCategoryAttributeDefInput({
        categoryId: "11111111-1111-1111-1111-111111111111",
        key: `key_${dataType}`,
        label: "Label",
        dataType,
        required: false,
        sortOrder: 0,
      });
      expect(result.ok).toBe(true);
    }
  });

  it("rejects a missing categoryId", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });

    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 = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "not-a-uuid",
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });

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

  it("rejects an empty key", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      key: "",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });

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

  it("rejects an empty label", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      key: "ram_gb",
      label: "",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });

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

  it("rejects an invalid dataType", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "float",
      required: true,
      sortOrder: 1,
    });

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

  it("rejects a missing dataType", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      key: "ram_gb",
      label: "RAM (GB)",
      required: true,
      sortOrder: 1,
    });

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

  it("rejects a non-boolean required", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: "yes",
      sortOrder: 1,
    });

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

  it("rejects a non-integer sortOrder", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1.5,
    });

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

  it("rejects a missing sortOrder", () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "11111111-1111-1111-1111-111111111111",
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
    });

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

describe("createAssetCategoryAttributeDef", () => {
  it("creates an attribute def for a real category", async () => {
    const category = await createTestAssetCategory();
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: category.id,
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });
    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const created = await createAssetCategoryAttributeDef(result.value);

    expect(created.ok).toBe(true);
    if (!created.ok) return;
    expect(created.value).toMatchObject({
      category_id: category.id,
      key: "ram_gb",
      label: "RAM (GB)",
      data_type: "number",
      required: true,
      sort_order: 1,
    });
    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("returns a clean error when categoryId doesn't reference an existing category", async () => {
    const result = validateCreateAssetCategoryAttributeDefInput({
      categoryId: "00000000-0000-0000-0000-000000000000",
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });
    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const created = await createAssetCategoryAttributeDef(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.assetCategoryAttributeDef.findMany();
    expect(remaining).toHaveLength(0);
  });

  it("rejects a duplicate key within the same category with a clean 400-style error", async () => {
    const category = await createTestAssetCategory();
    const first = validateCreateAssetCategoryAttributeDefInput({
      categoryId: category.id,
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });
    expect(first.ok).toBe(true);
    if (first.ok) {
      const firstCreated = await createAssetCategoryAttributeDef(first.value);
      expect(firstCreated.ok).toBe(true);
    }

    const second = validateCreateAssetCategoryAttributeDefInput({
      categoryId: category.id,
      key: "ram_gb",
      label: "RAM (GB) duplicate",
      dataType: "number",
      required: false,
      sortOrder: 2,
    });
    expect(second.ok).toBe(true);
    if (!second.ok) return;

    const created = await createAssetCategoryAttributeDef(second.value);
    expect(created.ok).toBe(false);
    if (created.ok) return;
    expect(created.error).toMatch(/key/i);

    const remaining = await prisma.assetCategoryAttributeDef.findMany();
    expect(remaining).toHaveLength(1);
  });

  it("allows the same key across two different categories", async () => {
    const laptop = await createTestAssetCategory({ name: "Laptop" });
    const monitor = await createTestAssetCategory({ name: "Màn hình" });

    const first = validateCreateAssetCategoryAttributeDefInput({
      categoryId: laptop.id,
      key: "weight_kg",
      label: "Khối lượng (kg)",
      dataType: "number",
      required: false,
      sortOrder: 1,
    });
    expect(first.ok).toBe(true);
    if (first.ok) {
      const firstCreated = await createAssetCategoryAttributeDef(first.value);
      expect(firstCreated.ok).toBe(true);
    }

    const second = validateCreateAssetCategoryAttributeDefInput({
      categoryId: monitor.id,
      key: "weight_kg",
      label: "Khối lượng (kg)",
      dataType: "number",
      required: false,
      sortOrder: 1,
    });
    expect(second.ok).toBe(true);
    if (!second.ok) return;

    const created = await createAssetCategoryAttributeDef(second.value);
    expect(created.ok).toBe(true);
    if (!created.ok) return;
    expect(created.value.category_id).toBe(monitor.id);
    expect(created.value.key).toBe("weight_kg");

    const remaining = await prisma.assetCategoryAttributeDef.findMany();
    expect(remaining).toHaveLength(2);
  });
});

describe("listAssetCategoryAttributeDefs", () => {
  it("lists created attribute defs, newest first", async () => {
    const category = await createTestAssetCategory();

    const first = validateCreateAssetCategoryAttributeDefInput({
      categoryId: category.id,
      key: "ram_gb",
      label: "RAM (GB)",
      dataType: "number",
      required: true,
      sortOrder: 1,
    });
    expect(first.ok).toBe(true);
    if (first.ok) await createAssetCategoryAttributeDef(first.value);

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

    const second = validateCreateAssetCategoryAttributeDefInput({
      categoryId: category.id,
      key: "cpu",
      label: "CPU",
      dataType: "string",
      required: false,
      sortOrder: 2,
    });
    expect(second.ok).toBe(true);
    if (second.ok) await createAssetCategoryAttributeDef(second.value);

    const records = await listAssetCategoryAttributeDefs();

    expect(records).toHaveLength(2);
    // newest first
    expect(records[0]).toMatchObject({ key: "cpu" });
    expect(records[1]).toMatchObject({ key: "ram_gb" });
  });

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

describe("POST /api/asset-category-attribute-defs", () => {
  it("creates an attribute def on valid input", async () => {
    const category = await createTestAssetCategory();
    const res = await POST(
      postRequest({
        categoryId: category.id,
        key: "ram_gb",
        label: "RAM (GB)",
        dataType: "number",
        required: true,
        sortOrder: 1,
      })
    );

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

    expect(body).toMatchObject({
      category_id: category.id,
      key: "ram_gb",
      label: "RAM (GB)",
      data_type: "number",
      required: true,
      sort_order: 1,
    });
    expect(typeof body.id).toBe("string");
    expect(body.id.length).toBeGreaterThan(0);
    expect(Number.isNaN(Date.parse(body.created_at))).toBe(false);
  });

  it("rejects an invalid dataType", async () => {
    const category = await createTestAssetCategory();
    const res = await POST(
      postRequest({
        categoryId: category.id,
        key: "ram_gb",
        label: "RAM (GB)",
        dataType: "float",
        required: true,
        sortOrder: 1,
      })
    );

    expect(res.status).toBe(400);
    const body = await res.json();
    expect(body.error).toMatch(/dataType/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",
        key: "ram_gb",
        label: "RAM (GB)",
        dataType: "number",
        required: true,
        sortOrder: 1,
      })
    );

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

  it("rejects a duplicate (categoryId, key) with a clean 400, not a raw 500", async () => {
    const category = await createTestAssetCategory();
    const first = await POST(
      postRequest({
        categoryId: category.id,
        key: "ram_gb",
        label: "RAM (GB)",
        dataType: "number",
        required: true,
        sortOrder: 1,
      })
    );
    expect(first.status).toBe(201);

    const second = await POST(
      postRequest({
        categoryId: category.id,
        key: "ram_gb",
        label: "RAM (GB) duplicate",
        dataType: "number",
        required: false,
        sortOrder: 2,
      })
    );

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

    const remaining = await prisma.assetCategoryAttributeDef.findMany();
    expect(remaining).toHaveLength(1);
  });

  it("allows the same key across two different categories via the route", async () => {
    const laptop = await createTestAssetCategory({ name: "Laptop" });
    const monitor = await createTestAssetCategory({ name: "Màn hình" });

    const first = await POST(
      postRequest({
        categoryId: laptop.id,
        key: "weight_kg",
        label: "Khối lượng (kg)",
        dataType: "number",
        required: false,
        sortOrder: 1,
      })
    );
    expect(first.status).toBe(201);

    const second = await POST(
      postRequest({
        categoryId: monitor.id,
        key: "weight_kg",
        label: "Khối lượng (kg)",
        dataType: "number",
        required: false,
        sortOrder: 1,
      })
    );
    expect(second.status).toBe(201);

    const remaining = await prisma.assetCategoryAttributeDef.findMany();
    expect(remaining).toHaveLength(2);
  });

  it("rejects an invalid JSON body", async () => {
    const req = new Request("http://localhost/api/asset-category-attribute-defs", {
      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-categories) — 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-category-attribute-defs", () => {
  it("lists created attribute defs, newest first", async () => {
    const category = await createTestAssetCategory();
    await POST(
      postRequest({
        categoryId: category.id,
        key: "ram_gb",
        label: "RAM (GB)",
        dataType: "number",
        required: true,
        sortOrder: 1,
      })
    );
    // Ensure a distinct created_at ordering even on fast filesystems/clocks.
    await new Promise((resolve) => setTimeout(resolve, 5));
    await POST(
      postRequest({
        categoryId: category.id,
        key: "cpu",
        label: "CPU",
        dataType: "string",
        required: false,
        sortOrder: 2,
      })
    );

    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({ key: "cpu" });
    expect(body[1]).toMatchObject({ key: "ram_gb" });
  });

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

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

    const res = await POST(
      postRequest({
        categoryId: category.id,
        key: "ram_gb",
        label: "RAM (GB)",
        dataType: "number",
        required: true,
        sortOrder: 1,
      })
    );

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

  it("GET /api/asset-category-attribute-defs 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" });
  });
});