/**
 * Unit tests for `src/actions/water-log/auth.ts` — the centralized auth
 * helpers for the water log module.
 *
 * These helpers are the gate for every field/admin-PIN server action
 * (`/water`, `/water/admin/*`). Critically, **they must not call
 * `getSession()` from `@/lib/auth`** (the Neon Auth wrapper) — that
 * was the source of the bug where PIN submission hung for users with
 * no platform login.
 *
 * If a future refactor accidentally re-introduces a `getSession()` call
 * in this module, the `does not import getSession from @/lib/auth` test
 * below will fail.
 */
import { describe, it, expect, vi, beforeEach } from "vitest";

// ── Hoisted state (visible inside vi.mock factory closures) ────────────

const state = vi.hoisted(() => ({
  cookieValue: undefined as string | undefined,
  mockDb: { select: vi.fn() } as { select: ReturnType<typeof vi.fn> },
  mockWithPlatformAdmin: null as unknown as ReturnType<typeof vi.fn>,
  mockGetAdminUser: null as unknown as ReturnType<typeof vi.fn>,
}));

state.mockWithPlatformAdmin = vi.fn(
  async (fn: (db: typeof state.mockDb) => Promise<unknown>) => fn(state.mockDb),
);
state.mockGetAdminUser = vi.fn();

vi.mock("server-only", () => ({}));

vi.mock("@/db/client", () => ({
  withPlatformAdmin: state.mockWithPlatformAdmin,
  withBrand: vi.fn(),
  withDb: vi.fn(),
}));

vi.mock("@/lib/admin-permissions", () => ({
  getAdminUser: state.mockGetAdminUser,
}));

vi.mock("next/headers", () => ({
  cookies: () =>
    Promise.resolve({
      get: () =>
        state.cookieValue !== undefined
          ? { value: state.cookieValue }
          : undefined,
    }),
  headers: () => Promise.resolve(new Headers()),
}));

beforeEach(() => {
  state.cookieValue = undefined;
  state.mockDb.select.mockReset();
  state.mockWithPlatformAdmin.mockClear();
  state.mockGetAdminUser.mockReset();
});

// ── Module guards (the regression this whole PR exists for) ─────────────

describe("water-log/auth — module surface", () => {
  it("does not import getSession from @/lib/auth", async () => {
    // Strip comments (block + line) and collapse whitespace before checking
    // — the JSDoc deliberately references these symbols as documentation
    // of what the module does NOT do.
    const fs = await import("node:fs/promises");
    const path = await import("node:path");
    const raw = await fs.readFile(
      path.resolve(process.cwd(), "src/actions/water-log/auth.ts"),
      "utf8",
    );
    const stripped = raw
      .replace(/\/\*[\s\S]*?\*\//g, "")
      .replace(/^\s*\/\/.*$/gm, "")
      .replace(/\s+/g, " ");
    expect(stripped).not.toMatch(/from\s+["']@\/lib\/auth["']/);
    expect(stripped).not.toMatch(/\bgetSession\s*\(/);
  });
});

// ── Module guard for the Tuxedo admin-PIN entry flow ───────────────────
//
// The `/water/admin/login` page is Tuxedo-brand-specific and PIN-only.
// Users must be able to enter the admin PIN WITHOUT being signed into
// the platform. If a future refactor re-adds a Neon Auth dependency
// (getSession / getAdminUser) inside `verifyWaterAdminPin`, the PIN
// submission 500s for unauthenticated field staff.
//
// Note: other functions in settings.ts (getWaterAdminSettings,
// saveWaterAdminSettings, regenerateAdminPin) are called from the
// platform-admin-gated `/admin/water-log/settings/*` UI and correctly
// DO depend on `getAdminUser()`. Only `verifyWaterAdminPin` is the
// PIN-only entry point.

describe("water-log/settings — verifyWaterAdminPin surface", () => {
  /**
   * Extract just the body of `verifyWaterAdminPin` from settings.ts so
   * the regression check is scoped to that function (and not falsely
   * tripped by sibling functions that legitimately use getAdminUser).
   *
   * The function is the LAST export in the file, so we read from
   * `export async function verifyWaterAdminPin` to EOF.
   */
  async function getVerifyWaterAdminPinSource(): Promise<string> {
    const fs = await import("node:fs/promises");
    const path = await import("node:path");
    const raw = await fs.readFile(
      path.resolve(
        process.cwd(),
        "src/actions/water-log/settings.ts",
      ),
      "utf8",
    );
    const idx = raw.indexOf("export async function verifyWaterAdminPin");
    if (idx === -1) throw new Error("verifyWaterAdminPin not found");
    return raw.slice(idx);
  }

  function stripComments(src: string): string {
    return src
      .replace(/\/\*[\s\S]*?\*\//g, "")
      .replace(/^\s*\/\/.*$/gm, "")
      .replace(/\s+/g, " ");
  }

  it("does not call getAdminUser inside verifyWaterAdminPin", async () => {
    const stripped = stripComments(await getVerifyWaterAdminPinSource());
    expect(stripped).not.toMatch(/\bgetAdminUser\s*\(/);
  });

  it("does not call getSession inside verifyWaterAdminPin", async () => {
    const stripped = stripComments(await getVerifyWaterAdminPinSource());
    expect(stripped).not.toMatch(/\bgetSession\s*\(/);
  });

  it("always inserts the zero-UUID fallback adminUserId", async () => {
    const stripped = stripComments(await getVerifyWaterAdminPinSource());
    // Confirms the session row is inserted with the placeholder UUID
    // — i.e. the function no longer conditions adminUserId on a
    // successful platform-admin lookup.
    expect(stripped).toMatch(
      /00000000-0000-0000-0000-000000000000/,
    );
  });
});

// ── requireFieldSession ─────────────────────────────────────────────────

describe("requireFieldSession()", () => {
  it("returns { ok: false, error: 'Not logged in' } when wl_session cookie is missing", async () => {
    state.cookieValue = undefined;
    const { requireFieldSession } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireFieldSession();
    expect(result).toEqual({ ok: false, error: "Not logged in" });
    expect(state.mockWithPlatformAdmin).not.toHaveBeenCalled();
  });

  it("returns { ok: false, error: 'Session not found' } when cookie has no matching row", async () => {
    state.cookieValue = "missing-session-id";
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        innerJoin: () => ({
          where: () => ({
            limit: async () => [],
          }),
        }),
      }),
    });
    const { requireFieldSession } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireFieldSession();
    expect(result).toEqual({ ok: false, error: "Session not found" });
  });

  it("returns { ok: false, error: 'Session expired' } and best-effort deletes the row when past expires_at", async () => {
    state.cookieValue = "expired-id";
    const past = new Date(Date.now() - 60_000);
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        innerJoin: () => ({
          where: () => ({
            limit: async () => [
              {
                session: { id: "expired-id", expiresAt: past },
                irrigator: {
                  id: "u1",
                  brandId: "b1",
                  role: "irrigator",
                  active: true,
                },
              },
            ],
          }),
        }),
      }),
    });
    const mockDelete = vi.fn().mockReturnValue({
      where: async () => undefined,
    });
    (state.mockDb as unknown as { select: typeof vi.fn; delete: typeof vi.fn }).delete =
      mockDelete;
    const { requireFieldSession } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireFieldSession();
    expect(result).toEqual({ ok: false, error: "Session expired" });
    expect(mockDelete).toHaveBeenCalled();
  });

  it("returns { ok: false, error: 'User is inactive' } when irrigator is soft-deleted", async () => {
    state.cookieValue = "valid-id";
    const future = new Date(Date.now() + 60_000);
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        innerJoin: () => ({
          where: () => ({
            limit: async () => [
              {
                session: { id: "valid-id", expiresAt: future },
                irrigator: {
                  id: "u1",
                  brandId: "b1",
                  role: "irrigator",
                  active: false,
                },
              },
            ],
          }),
        }),
      }),
    });
    const { requireFieldSession } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireFieldSession();
    expect(result).toEqual({ ok: false, error: "User is inactive" });
  });

  it("returns { ok: true, userId, brandId, role } on a happy-path session", async () => {
    state.cookieValue = "valid-id";
    const future = new Date(Date.now() + 60_000);
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        innerJoin: () => ({
          where: () => ({
            limit: async () => [
              {
                session: { id: "valid-id", expiresAt: future },
                irrigator: {
                  id: "u1",
                  brandId: "b1",
                  role: "irrigator",
                  active: true,
                },
              },
            ],
          }),
        }),
      }),
    });
    const { requireFieldSession } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireFieldSession();
    expect(result).toEqual({
      ok: true,
      userId: "u1",
      brandId: "b1",
      role: "irrigator",
    });
  });
});

// ── requireWaterAdminSession ────────────────────────────────────────────

describe("requireWaterAdminSession()", () => {
  it("returns { ok: false, error: 'Not signed in' } when wl_admin_session cookie is missing", async () => {
    state.cookieValue = undefined;
    const { requireWaterAdminSession } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireWaterAdminSession();
    expect(result).toEqual({ ok: false, error: "Not signed in" });
  });

  it("returns { ok: false, error: 'Session expired' } when row is past expires_at", async () => {
    state.cookieValue = "expired-admin";
    const past = new Date(Date.now() - 60_000);
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        where: () => ({
          limit: async () => [
            {
              id: "expired-admin",
              brandId: "b1",
              adminUserId: "au1",
              expiresAt: past,
            },
          ],
        }),
      }),
    });
    const { requireWaterAdminSession } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireWaterAdminSession();
    expect(result).toEqual({ ok: false, error: "Session expired" });
  });

  it("returns { ok: true, sessionId, brandId, adminUserId } on a happy-path admin session", async () => {
    state.cookieValue = "valid-admin";
    const future = new Date(Date.now() + 60_000);
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        where: () => ({
          limit: async () => [
            {
              id: "valid-admin",
              brandId: "b1",
              adminUserId: "au1",
              expiresAt: future,
            },
          ],
        }),
      }),
    });
    const { requireWaterAdminSession } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireWaterAdminSession();
    expect(result).toEqual({
      ok: true,
      sessionId: "valid-admin",
      brandId: "b1",
      adminUserId: "au1",
    });
  });
});

// ── getWaterAdminSession (the "return null on miss" variant) ────────────

describe("getWaterAdminSession()", () => {
  it("returns null when cookie is missing", async () => {
    state.cookieValue = undefined;
    const { getWaterAdminSession } = await import(
      "@/actions/water-log/auth"
    );
    expect(await getWaterAdminSession()).toBeNull();
  });

  it("returns null when session row is missing", async () => {
    state.cookieValue = "missing";
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        where: () => ({ limit: async () => [] }),
      }),
    });
    const { getWaterAdminSession } = await import(
      "@/actions/water-log/auth"
    );
    expect(await getWaterAdminSession()).toBeNull();
  });

  it("returns null when past expires_at", async () => {
    state.cookieValue = "expired";
    const past = new Date(Date.now() - 1);
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        where: () => ({
          limit: async () => [
            {
              id: "expired",
              brandId: "b1",
              adminUserId: "au1",
              expiresAt: past,
            },
          ],
        }),
      }),
    });
    const { getWaterAdminSession } = await import(
      "@/actions/water-log/auth"
    );
    expect(await getWaterAdminSession()).toBeNull();
  });

  it("returns the session shape on a valid row", async () => {
    state.cookieValue = "valid";
    const future = new Date(Date.now() + 60_000);
    state.mockDb.select.mockReturnValueOnce({
      from: () => ({
        where: () => ({
          limit: async () => [
            {
              id: "valid",
              brandId: "b1",
              adminUserId: "au1",
              expiresAt: future,
            },
          ],
        }),
      }),
    });
    const { getWaterAdminSession } = await import(
      "@/actions/water-log/auth"
    );
    expect(await getWaterAdminSession()).toEqual({
      sessionId: "valid",
      brandId: "b1",
      adminUserId: "au1",
      role: "water_admin",
    });
  });
});

// ── requireWaterAdminPermission (site-admin gate) ───────────────────────

describe("requireWaterAdminPermission()", () => {
  it("returns { ok: false, error: 'Not signed in' } when getAdminUser is null", async () => {
    state.mockGetAdminUser.mockResolvedValue(null);
    const { requireWaterAdminPermission } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireWaterAdminPermission();
    expect(result).toEqual({ ok: false, error: "Not signed in" });
  });

  it("returns { ok: false, error: 'Not authorized' } when admin lacks can_manage_water_log and is not platform_admin", async () => {
    state.mockGetAdminUser.mockResolvedValue({
      user_id: "u1",
      role: "brand_admin",
      can_manage_water_log: false,
    });
    const { requireWaterAdminPermission } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireWaterAdminPermission();
    expect(result).toEqual({ ok: false, error: "Not authorized" });
  });

  it("returns { ok: true, adminUser } when platform_admin", async () => {
    const adminUser = { user_id: "u1", role: "platform_admin" };
    state.mockGetAdminUser.mockResolvedValue(adminUser);
    const { requireWaterAdminPermission } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireWaterAdminPermission();
    expect(result).toEqual({ ok: true, adminUser });
  });

  it("returns { ok: true, adminUser } when brand_admin with can_manage_water_log", async () => {
    const adminUser = {
      user_id: "u1",
      role: "brand_admin",
      can_manage_water_log: true,
    };
    state.mockGetAdminUser.mockResolvedValue(adminUser);
    const { requireWaterAdminPermission } = await import(
      "@/actions/water-log/auth"
    );
    const result = await requireWaterAdminPermission();
    expect(result).toEqual({ ok: true, adminUser });
  });
});