"""Tests for Users — file-backed admin/author management."""

from __future__ import annotations

import os

from volumen.users import Users


class TestBootstrap:
    def test_bootstrap_user_from_hash(self, users_path: str, bootstrap_hash: str) -> None:
        users = Users(path=users_path, bootstrap_hash=bootstrap_hash)
        assert len(users.all) == 1
        assert users.authenticate("admin", "volumen-test-password") is not None

    def test_bootstrap_user_is_admin(self, users_path: str, bootstrap_hash: str) -> None:
        users = Users(path=users_path, bootstrap_hash=bootstrap_hash)
        admin = users.find("admin")
        assert admin is not None
        assert admin.role == "admin"

    def test_no_users_without_file_or_hash(self, users_path: str) -> None:
        users = Users(path=users_path)
        assert not users.any


class TestFind:
    def test_find_existing_user(self, users: Users) -> None:
        assert users.find("admin") is not None

    def test_find_nonexistent_user(self, users: Users) -> None:
        assert users.find("nobody") is None


class TestAuthenticate:
    def test_authenticate_correct_password(self, users: Users) -> None:
        assert users.authenticate("admin", "volumen-test-password") is not None

    def test_authenticate_wrong_password(self, users: Users) -> None:
        assert users.authenticate("admin", "nope") is None

    def test_authenticate_nonexistent_user(self, users: Users) -> None:
        assert users.authenticate("nobody", "volumen-test-password") is None


class TestAdd:
    def test_add_creates_user(self, users_path: str) -> None:
        users = Users(path=users_path)
        result = users.add("alice", "wonderland")
        assert result is not None
        assert result.username == "alice"
        assert os.path.isfile(users_path)

    def test_add_and_authenticate(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "wonderland")
        assert users.authenticate("alice", "wonderland") is not None
        assert users.authenticate("alice", "nope") is None

    def test_add_rejects_duplicate(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        assert users.add("alice", "y") is None

    def test_add_rejects_empty_username(self, users_path: str) -> None:
        users = Users(path=users_path)
        assert users.add("", "password") is None

    def test_add_with_explicit_role(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("boss", "x", "admin")
        assert users.find("boss").role == "admin"

    def test_add_default_role_is_author(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        assert users.find("alice").role == "author"

    def test_add_invalid_role_falls_back_to_default(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x", "wizard")
        assert users.find("alice").role == "author"


class TestUpdate:
    def test_update_name(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        users.update_name("alice", "Alice Smith")
        assert users.find("alice").name == "Alice Smith"

    def test_update_name_clear(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        users.update_name("alice", "Alice")
        users.update_name("alice", None)
        assert users.find("alice").name is None

    def test_update_fediverse_creator(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        users.update_fediverse_creator("alice", "@alice@example.com")
        assert users.find("alice").fediverse_creator == "@alice@example.com"

    def test_update_fediverse_creator_clear(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        users.update_fediverse_creator("alice", "@alice@example.com")
        users.update_fediverse_creator("alice", None)
        assert users.find("alice").fediverse_creator is None

    def test_update_photo(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        users.update_photo("alice", "/media/photo.webp")
        assert users.find("alice").photo == "/media/photo.webp"

    def test_update_password(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "old")
        users.update_password("alice", "new")
        assert users.authenticate("alice", "old") is None
        assert users.authenticate("alice", "new") is not None


class TestRename:
    def test_rename_user(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        assert users.rename("alice", "alicia") is not None
        assert users.find("alice") is None
        assert users.find("alicia") is not None

    def test_rename_to_existing_username(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        users.add("bob", "y")
        assert users.rename("alice", "bob") is None
        assert users.find("alice") is not None

    def test_rename_empty_new_name(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        assert users.rename("alice", "") is None


class TestSetRole:
    def test_set_role(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x", "admin")
        users.add("bob", "y", "author")
        assert users.set_role("bob", "admin") is not None
        assert users.find("bob").role == "admin"

    def test_cannot_demote_last_admin(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x", "admin")
        users.add("bob", "y", "author")
        assert users.set_role("alice", "author") is None
        assert users.find("alice").role == "admin"

    def test_set_role_invalid(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        assert users.set_role("alice", "wizard") is None


class TestDelete:
    def test_delete_user(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        users.add("bob", "y")
        assert users.delete("bob") == "bob"
        assert users.find("bob") is None

    def test_cannot_delete_last_user(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        assert users.delete("alice") is None
        assert users.find("alice") is not None

    def test_cannot_delete_last_admin(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x", "admin")
        users.add("bob", "y", "author")
        assert users.delete("alice") is None
        # After adding another admin, deletion works
        users.add("carol", "z", "admin")
        assert users.delete("alice") == "alice"


class TestPersistence:
    def test_persistence_write_and_read(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "wonderland")
        users.add("bob", "builder", "admin")
        users.update_name("alice", "Alice")

        # Read back from disk with a fresh instance
        fresh = Users(path=users_path)
        assert len(fresh.all) == 2
        alice = fresh.find("alice")
        assert alice is not None
        assert alice.name == "Alice"
        assert alice.role == "author"
        bob = fresh.find("bob")
        assert bob is not None
        assert bob.role == "admin"

    def test_password_survives_persistence(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "alice-test-password")
        fresh = Users(path=users_path)
        assert fresh.authenticate("alice", "alice-test-password") is not None
        assert fresh.authenticate("alice", "wrong") is None

    def test_mtime_cache_invalidation(self, users_path: str) -> None:
        users = Users(path=users_path)
        users.add("alice", "x")
        assert len(users.all) == 1

        # Directly modify the file behind the cache
        with open(users_path, "w") as fh:
            fh.write("")

        # Should detect file change and return empty
        assert len(users.all) == 0