import pytest
import sqlite3
import types


def test_query(fresh_db):
    fresh_db["dogs"].insert_all([{"name": "Cleo"}, {"name": "Pancakes"}])
    results = fresh_db.query("select * from dogs order by name desc")
    assert isinstance(results, types.GeneratorType)
    assert list(results) == [{"name": "Pancakes"}, {"name": "Cleo"}]


def test_query_executes_eagerly(fresh_db):
    # The SQL runs when query() is called, not when the result is iterated,
    # so errors are raised at the call site
    with pytest.raises(sqlite3.OperationalError):
        fresh_db.query("select * from missing_table")


def test_query_rejects_statements_that_return_no_rows(fresh_db):
    fresh_db["dogs"].insert({"name": "Cleo"})
    with pytest.raises(ValueError) as ex:
        fresh_db.query("update dogs set name = 'Cleopaws'")
    assert "execute()" in str(ex.value)


@pytest.mark.skipif(
    sqlite3.sqlite_version_info < (3, 35, 0),
    reason="RETURNING requires SQLite 3.35.0 or higher",
)
def test_query_insert_returning(fresh_db):
    fresh_db["dogs"].insert({"name": "Cleo"})
    rows = list(
        fresh_db.query("insert into dogs (name) values ('Pancakes') returning name")
    )
    assert rows == [{"name": "Pancakes"}]
    assert fresh_db["dogs"].count == 2


def test_execute_returning_dicts(fresh_db):
    # Like db.query() but returns a list, included for backwards compatibility
    # see https://github.com/simonw/sqlite-utils/issues/290
    fresh_db["test"].insert({"id": 1, "bar": 2}, pk="id")
    assert fresh_db.execute_returning_dicts("select * from test") == [
        {"id": 1, "bar": 2}
    ]