"""
Tests for SQLite user database.

Tests CRUD operations on users and user_settings tables.
"""

import os
import sqlite3
import tempfile

import pytest


@pytest.fixture
def db_path():
    """Create a temporary database path."""
    with tempfile.TemporaryDirectory() as tmpdir:
        yield os.path.join(tmpdir, "shelfmark.db")


@pytest.fixture
def user_db(db_path):
    """Create a UserDB instance with a temporary database."""
    from shelfmark.core.user_db import UserDB

    db = UserDB(db_path)
    db.initialize()
    return db


class TestUserDBInitialization:
    """Tests for database creation and schema setup."""

    def test_initialize_creates_database_file(self, db_path):
        from shelfmark.core.user_db import UserDB

        db = UserDB(db_path)
        db.initialize()
        assert os.path.exists(db_path)

    def test_initialize_creates_users_table(self, user_db, db_path):
        conn = sqlite3.connect(db_path)
        cursor = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='table' AND name='users'"
        )
        assert cursor.fetchone() is not None
        conn.close()

    def test_initialize_creates_user_settings_table(self, user_db, db_path):
        conn = sqlite3.connect(db_path)
        cursor = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='table' AND name='user_settings'"
        )
        assert cursor.fetchone() is not None
        conn.close()

    def test_initialize_creates_download_requests_table(self, user_db, db_path):
        conn = sqlite3.connect(db_path)
        cursor = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='table' AND name='download_requests'"
        )
        assert cursor.fetchone() is not None
        conn.close()

    def test_initialize_creates_activity_tables(self, user_db, db_path):
        conn = sqlite3.connect(db_path)
        activity_log = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='table' AND name='activity_log'"
        ).fetchone()
        dismissals = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='table' AND name='activity_dismissals'"
        ).fetchone()
        assert activity_log is not None
        assert dismissals is not None
        conn.close()

    def test_initialize_creates_download_requests_indexes(self, user_db, db_path):
        conn = sqlite3.connect(db_path)
        rows = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='index' AND tbl_name='download_requests'"
        ).fetchall()
        index_names = {row[0] for row in rows}
        assert "idx_download_requests_user_status_created_at" in index_names
        assert "idx_download_requests_status_created_at" in index_names
        conn.close()

    def test_initialize_creates_activity_indexes(self, user_db, db_path):
        conn = sqlite3.connect(db_path)
        rows = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='index' AND tbl_name='activity_log'"
        ).fetchall()
        log_index_names = {row[0] for row in rows}
        assert "idx_activity_log_user_terminal" in log_index_names
        assert "idx_activity_log_lookup" in log_index_names

        rows = conn.execute(
            "SELECT name FROM sqlite_master WHERE type='index' AND tbl_name='activity_dismissals'"
        ).fetchall()
        dismissal_index_names = {row[0] for row in rows}
        assert "idx_activity_dismissals_user_dismissed_at" in dismissal_index_names
        conn.close()

    def test_initialize_enables_wal_mode(self, user_db, db_path):
        conn = sqlite3.connect(db_path)
        cursor = conn.execute("PRAGMA journal_mode")
        mode = cursor.fetchone()[0]
        assert mode == "wal"
        conn.close()

    def test_initialize_is_idempotent(self, db_path):
        from shelfmark.core.user_db import UserDB

        db = UserDB(db_path)
        db.initialize()
        db.initialize()  # Should not raise
        assert os.path.exists(db_path)

    def test_initialize_migrates_auth_source_column_and_backfills(self, db_path):
        """Existing DBs without auth_source should be migrated in place."""
        conn = sqlite3.connect(db_path)
        conn.executescript(
            """
            CREATE TABLE users (
                id            INTEGER PRIMARY KEY AUTOINCREMENT,
                username      TEXT UNIQUE NOT NULL,
                email         TEXT,
                display_name  TEXT,
                password_hash TEXT,
                oidc_subject  TEXT UNIQUE,
                role          TEXT NOT NULL DEFAULT 'user',
                created_at    TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );
            CREATE TABLE user_settings (
                user_id       INTEGER PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
                settings_json TEXT NOT NULL DEFAULT '{}'
            );
            """
        )
        conn.execute(
            "INSERT INTO users (username, password_hash, oidc_subject, role) VALUES (?, ?, ?, ?)",
            ("local_admin", "hash", None, "admin"),
        )
        conn.execute(
            "INSERT INTO users (username, oidc_subject, role) VALUES (?, ?, ?)",
            ("oidc_user", "sub-123", "user"),
        )
        conn.commit()
        conn.close()

        from shelfmark.core.user_db import UserDB

        db = UserDB(db_path)
        db.initialize()

        conn = sqlite3.connect(db_path)
        conn.row_factory = sqlite3.Row
        columns = conn.execute("PRAGMA table_info(users)").fetchall()
        assert "auth_source" in {str(c["name"]) for c in columns}

        rows = conn.execute(
            "SELECT username, auth_source FROM users ORDER BY username"
        ).fetchall()
        by_username = {r["username"]: r["auth_source"] for r in rows}
        assert by_username["local_admin"] == "builtin"
        assert by_username["oidc_user"] == "oidc"
        conn.close()

    def test_initialize_preserves_existing_users_and_user_settings_rows(self, db_path):
        conn = sqlite3.connect(db_path)
        conn.executescript(
            """
            CREATE TABLE users (
                id            INTEGER PRIMARY KEY AUTOINCREMENT,
                username      TEXT UNIQUE NOT NULL,
                email         TEXT,
                display_name  TEXT,
                password_hash TEXT,
                oidc_subject  TEXT UNIQUE,
                role          TEXT NOT NULL DEFAULT 'user',
                created_at    TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );
            CREATE TABLE user_settings (
                user_id       INTEGER PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
                settings_json TEXT NOT NULL DEFAULT '{}'
            );
            """
        )
        conn.execute(
            "INSERT INTO users (id, username, email, role) VALUES (?, ?, ?, ?)",
            (1, "legacy-user", "legacy@example.com", "user"),
        )
        conn.execute(
            "INSERT INTO user_settings (user_id, settings_json) VALUES (?, ?)",
            (1, '{"DESTINATION":"/books/legacy"}'),
        )
        conn.commit()
        conn.close()

        from shelfmark.core.user_db import UserDB

        db = UserDB(db_path)
        db.initialize()
        db.initialize()

        conn = sqlite3.connect(db_path)
        user_row = conn.execute(
            "SELECT username, email FROM users WHERE id = 1"
        ).fetchone()
        settings_row = conn.execute(
            "SELECT settings_json FROM user_settings WHERE user_id = 1"
        ).fetchone()
        assert user_row == ("legacy-user", "legacy@example.com")
        assert settings_row == ('{"DESTINATION":"/books/legacy"}',)
        conn.close()

    def test_initialize_does_not_add_policy_columns_to_users_table(self, user_db, db_path):
        conn = sqlite3.connect(db_path)
        conn.row_factory = sqlite3.Row
        columns = conn.execute("PRAGMA table_info(users)").fetchall()
        column_names = {str(col["name"]) for col in columns}
        assert "REQUESTS_ENABLED" not in column_names
        assert "REQUEST_POLICY_DEFAULT_EBOOK" not in column_names
        assert "REQUEST_POLICY_DEFAULT_AUDIOBOOK" not in column_names
        assert "REQUEST_POLICY_RULES" not in column_names
        assert "MAX_PENDING_REQUESTS_PER_USER" not in column_names
        assert "REQUESTS_ALLOW_NOTES" not in column_names
        conn.close()


class TestUserCRUD:
    """Tests for user create, read, update, delete operations."""

    def test_create_user(self, user_db):
        user = user_db.create_user(
            username="john",
            email="john@example.com",
            display_name="John Doe",
        )
        assert user["id"] is not None
        assert user["username"] == "john"
        assert user["email"] == "john@example.com"
        assert user["display_name"] == "John Doe"
        assert user["auth_source"] == "builtin"
        assert user["role"] == "user"

    def test_create_user_with_password(self, user_db):
        user = user_db.create_user(
            username="admin",
            password_hash="hashed_pw",
            role="admin",
        )
        assert user["role"] == "admin"
        assert user["password_hash"] == "hashed_pw"

    def test_create_user_with_oidc_subject(self, user_db):
        user = user_db.create_user(
            username="oidcuser",
            oidc_subject="sub-12345",
            email="oidc@example.com",
            auth_source="oidc",
        )
        assert user["oidc_subject"] == "sub-12345"
        assert user["auth_source"] == "oidc"

    def test_create_user_with_invalid_auth_source_fails(self, user_db):
        with pytest.raises(ValueError, match="Invalid auth_source"):
            user_db.create_user(username="john", auth_source="not-real")

    def test_create_duplicate_username_fails(self, user_db):
        user_db.create_user(username="john")
        with pytest.raises(ValueError, match="already exists"):
            user_db.create_user(username="john")

    def test_create_duplicate_oidc_subject_fails(self, user_db):
        user_db.create_user(username="user1", oidc_subject="sub-123")
        with pytest.raises(ValueError, match="already exists"):
            user_db.create_user(username="user2", oidc_subject="sub-123")

    def test_get_user_by_id(self, user_db):
        created = user_db.create_user(username="john")
        fetched = user_db.get_user(user_id=created["id"])
        assert fetched["username"] == "john"

    def test_get_user_by_username(self, user_db):
        user_db.create_user(username="john", email="john@example.com")
        fetched = user_db.get_user(username="john")
        assert fetched["email"] == "john@example.com"

    def test_get_user_by_oidc_subject(self, user_db):
        user_db.create_user(username="john", oidc_subject="sub-123")
        fetched = user_db.get_user(oidc_subject="sub-123")
        assert fetched["username"] == "john"

    def test_get_nonexistent_user_returns_none(self, user_db):
        assert user_db.get_user(username="nobody") is None

    def test_update_user(self, user_db):
        user = user_db.create_user(username="john", role="user")
        user_db.update_user(
            user["id"],
            role="admin",
            email="new@example.com",
            auth_source="proxy",
        )
        updated = user_db.get_user(user_id=user["id"])
        assert updated["role"] == "admin"
        assert updated["email"] == "new@example.com"
        assert updated["auth_source"] == "proxy"

    def test_update_user_rejects_invalid_auth_source(self, user_db):
        user = user_db.create_user(username="john")
        with pytest.raises(ValueError, match="Invalid auth_source"):
            user_db.update_user(user["id"], auth_source="bad")

    def test_update_nonexistent_user_raises(self, user_db):
        with pytest.raises(ValueError, match="not found"):
            user_db.update_user(9999, role="admin")

    def test_delete_user(self, user_db):
        user = user_db.create_user(username="john")
        user_db.delete_user(user["id"])
        assert user_db.get_user(user_id=user["id"]) is None

    def test_delete_user_cascades_settings(self, user_db):
        user = user_db.create_user(username="john")
        user_db.set_user_settings(user["id"], {"booklore_library_id": 1})
        user_db.delete_user(user["id"])
        assert user_db.get_user_settings(user["id"]) == {}

    def test_list_users(self, user_db):
        user_db.create_user(username="alice")
        user_db.create_user(username="bob")
        user_db.create_user(username="charlie")
        users = user_db.list_users()
        assert len(users) == 3
        usernames = [u["username"] for u in users]
        assert "alice" in usernames
        assert "bob" in usernames
        assert "charlie" in usernames


class TestUserSettings:
    """Tests for per-user settings."""

    def test_set_and_get_user_settings(self, user_db):
        user = user_db.create_user(username="john")
        settings = {"booklore_library_id": 5, "booklore_path_id": 2}
        user_db.set_user_settings(user["id"], settings)
        fetched = user_db.get_user_settings(user["id"])
        assert fetched["booklore_library_id"] == 5
        assert fetched["booklore_path_id"] == 2

    def test_get_settings_for_user_without_settings(self, user_db):
        user = user_db.create_user(username="john")
        assert user_db.get_user_settings(user["id"]) == {}

    def test_update_user_settings_merges(self, user_db):
        user = user_db.create_user(username="john")
        user_db.set_user_settings(user["id"], {"key1": "val1"})
        user_db.set_user_settings(user["id"], {"key2": "val2"})
        settings = user_db.get_user_settings(user["id"])
        assert settings["key1"] == "val1"
        assert settings["key2"] == "val2"

    def test_update_user_settings_overwrites_existing_key(self, user_db):
        user = user_db.create_user(username="john")
        user_db.set_user_settings(user["id"], {"key1": "old"})
        user_db.set_user_settings(user["id"], {"key1": "new"})
        settings = user_db.get_user_settings(user["id"])
        assert settings["key1"] == "new"


class TestDownloadRequests:
    """Tests for download request storage and validation."""

    @staticmethod
    def _book_data():
        return {
            "title": "Test Book",
            "author": "Test Author",
            "content_type": "ebook",
            "provider": "openlibrary",
            "provider_id": "ol-1",
        }

    @staticmethod
    def _release_data():
        return {
            "source": "direct_download",
            "source_id": "release-1",
            "title": "Release One",
        }

    def test_create_and_get_release_level_request(self, user_db):
        user = user_db.create_user(username="alice")

        created = user_db.create_request(
            user_id=user["id"],
            content_type="ebook",
            request_level="release",
            policy_mode="request_release",
            book_data=self._book_data(),
            release_data=self._release_data(),
            note="please grab this release",
        )

        assert created["id"] is not None
        assert created["status"] == "pending"
        assert created["policy_mode"] == "request_release"
        assert created["request_level"] == "release"
        assert created["book_data"]["title"] == "Test Book"
        assert created["release_data"]["source_id"] == "release-1"

        fetched = user_db.get_request(created["id"])
        assert fetched is not None
        assert fetched["id"] == created["id"]
        assert fetched["note"] == "please grab this release"

    def test_create_request_rejects_invalid_status(self, user_db):
        user = user_db.create_user(username="alice")

        with pytest.raises(ValueError, match="Invalid request status"):
            user_db.create_request(
                user_id=user["id"],
                status="queued",
                content_type="ebook",
                request_level="book",
                policy_mode="request_book",
                book_data=self._book_data(),
            )

    def test_create_request_rejects_invalid_policy_mode(self, user_db):
        user = user_db.create_user(username="alice")

        with pytest.raises(ValueError, match="Invalid policy_mode"):
            user_db.create_request(
                user_id=user["id"],
                content_type="ebook",
                request_level="book",
                policy_mode="allow",
                book_data=self._book_data(),
            )

    def test_create_request_rejects_release_level_without_release_data(self, user_db):
        user = user_db.create_user(username="alice")

        with pytest.raises(ValueError, match="request_level=release requires non-null release_data"):
            user_db.create_request(
                user_id=user["id"],
                content_type="ebook",
                request_level="release",
                policy_mode="request_release",
                book_data=self._book_data(),
                release_data=None,
            )

    def test_create_request_rejects_book_level_with_release_data(self, user_db):
        user = user_db.create_user(username="alice")

        with pytest.raises(ValueError, match="request_level=book requires null release_data"):
            user_db.create_request(
                user_id=user["id"],
                content_type="ebook",
                request_level="book",
                policy_mode="request_book",
                book_data=self._book_data(),
                release_data=self._release_data(),
            )

    def test_create_request_rejects_non_object_release_data(self, user_db):
        user = user_db.create_user(username="alice")

        with pytest.raises(ValueError, match="release_data must be an object when provided"):
            user_db.create_request(
                user_id=user["id"],
                content_type="ebook",
                request_level="release",
                policy_mode="request_release",
                book_data=self._book_data(),
                release_data="not-an-object",
            )

    def test_list_requests_filters_by_user_and_status(self, user_db):
        alice = user_db.create_user(username="alice")
        bob = user_db.create_user(username="bob")

        alice_pending = user_db.create_request(
            user_id=alice["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
        )
        alice_fulfilled = user_db.create_request(
            user_id=alice["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
            status="fulfilled",
        )
        bob_pending = user_db.create_request(
            user_id=bob["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
        )

        alice_only = user_db.list_requests(user_id=alice["id"])
        assert {row["id"] for row in alice_only} == {alice_pending["id"], alice_fulfilled["id"]}

        pending_only = user_db.list_requests(status="pending")
        assert {row["id"] for row in pending_only} == {alice_pending["id"], bob_pending["id"]}

    def test_update_request_allows_pending_to_terminal_transition(self, user_db):
        user = user_db.create_user(username="alice")
        created = user_db.create_request(
            user_id=user["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
        )

        updated = user_db.update_request(
            created["id"],
            status="fulfilled",
            admin_note="done",
        )

        assert updated["status"] == "fulfilled"
        assert updated["admin_note"] == "done"

    def test_update_request_expected_current_status_enforces_compare_and_swap(self, user_db):
        user = user_db.create_user(username="alice")
        created = user_db.create_request(
            user_id=user["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
        )

        first = user_db.update_request(
            created["id"],
            expected_current_status="pending",
            status="fulfilled",
        )
        assert first["status"] == "fulfilled"

        with pytest.raises(ValueError, match="Request state changed before update"):
            user_db.update_request(
                created["id"],
                expected_current_status="pending",
                status="fulfilled",
            )

    def test_update_request_rejects_terminal_status_mutation(self, user_db):
        user = user_db.create_user(username="alice")
        created = user_db.create_request(
            user_id=user["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
            status="cancelled",
        )

        with pytest.raises(ValueError, match="Terminal request statuses are immutable"):
            user_db.update_request(created["id"], status="fulfilled")

    def test_update_request_validates_request_level_and_release_data(self, user_db):
        user = user_db.create_user(username="alice")
        created = user_db.create_request(
            user_id=user["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
        )

        with pytest.raises(ValueError, match="request_level=release requires non-null release_data"):
            user_db.update_request(created["id"], request_level="release")

        updated = user_db.update_request(
            created["id"],
            request_level="release",
            release_data=self._release_data(),
            policy_mode="request_release",
        )
        assert updated["request_level"] == "release"
        assert updated["policy_mode"] == "request_release"
        assert updated["release_data"]["source_id"] == "release-1"

    def test_update_request_allows_fulfilled_book_level_to_store_release_data(self, user_db):
        user = user_db.create_user(username="alice")
        created = user_db.create_request(
            user_id=user["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
        )

        updated = user_db.update_request(
            created["id"],
            status="fulfilled",
            release_data=self._release_data(),
            admin_note="Approved from browse mode",
        )
        assert updated["request_level"] == "book"
        assert updated["status"] == "fulfilled"
        assert updated["release_data"]["source_id"] == "release-1"
        assert updated["admin_note"] == "Approved from browse mode"

    def test_update_request_rejects_non_object_release_data(self, user_db):
        user = user_db.create_user(username="alice")
        created = user_db.create_request(
            user_id=user["id"],
            content_type="ebook",
            request_level="release",
            policy_mode="request_release",
            book_data=self._book_data(),
            release_data=self._release_data(),
        )

        with pytest.raises(ValueError, match="release_data must be an object when provided"):
            user_db.update_request(created["id"], release_data="not-an-object")

    def test_count_pending_requests(self, user_db):
        alice = user_db.create_user(username="alice")
        bob = user_db.create_user(username="bob")

        user_db.create_request(
            user_id=alice["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
            status="pending",
        )
        user_db.create_request(
            user_id=alice["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
            status="fulfilled",
        )
        user_db.create_request(
            user_id=bob["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
            status="pending",
        )

        assert user_db.count_pending_requests() == 2
        assert user_db.count_user_pending_requests(alice["id"]) == 1
        assert user_db.count_user_pending_requests(bob["id"]) == 1

    def test_delete_user_cascades_download_requests(self, user_db):
        user = user_db.create_user(username="alice")
        created = user_db.create_request(
            user_id=user["id"],
            content_type="ebook",
            request_level="book",
            policy_mode="request_book",
            book_data=self._book_data(),
        )

        user_db.delete_user(user["id"])

        assert user_db.get_request(created["id"]) is None