from __future__ import annotations

from contextlib import contextmanager

import pytest

import ariadne.db.database as db_module
from ariadne.db.database import Database


class DummyResult:
    def __init__(self, row=None, rows=None):
        self._row = row
        self._rows = rows or []

    def fetchone(self):
        return self._row

    def fetchall(self):
        return self._rows


class DummyConn:
    def __init__(self):
        self.row_factory = None
        self.executed = []

    def execute(self, query, params=None):
        self.executed.append((query, params))
        if "pg_try_advisory_lock" in query:
            return DummyResult(row=(True,))
        return DummyResult()


class DummyPool:
    def __init__(self, conninfo=None, min_size=None, max_size=None, kwargs=None):
        self.conn = DummyConn()

    @contextmanager
    def connection(self):
        yield self.conn

    def close(self):
        return None


def test_migrate_runs(monkeypatch) -> None:
    monkeypatch.setattr(db_module, "ConnectionPool", DummyPool)
    db = Database("postgresql://user:pass@localhost/db")
    db.migrate(lock_id=123)
    assert db._pool.conn.executed


def test_fetch_and_execute(monkeypatch) -> None:
    monkeypatch.setattr(db_module, "ConnectionPool", DummyPool)
    db = Database("postgresql://user:pass@localhost/db")
    db.execute("SELECT 1")
    db.fetchone("SELECT 1")
    db.fetchall("SELECT 1")
    db.close()
    assert db._pool.conn.executed


def test_database_requires_dsn() -> None:
    with pytest.raises(RuntimeError):
        Database("")


def test_migrate_handles_lock(monkeypatch) -> None:
    class LockConn(DummyConn):
        def execute(self, query, params=None):
            if "CREATE TABLE" in query:
                raise db_module.psycopg.errors.LockNotAvailable()
            return super().execute(query, params)

    class LockPool(DummyPool):
        def __init__(self, conninfo=None, min_size=None, max_size=None, kwargs=None):
            self.conn = LockConn()

    monkeypatch.setattr(db_module, "ConnectionPool", LockPool)
    db = Database("postgresql://user:pass@localhost/db")
    db.migrate(lock_id=123)


def test_migrate_ignores_timeout_errors(monkeypatch) -> None:
    class TimeoutConn(DummyConn):
        def execute(self, query, params=None):
            if query.startswith("SET lock_timeout") or query.startswith("SET statement_timeout"):
                raise RuntimeError("boom")
            return super().execute(query, params)

    class TimeoutPool(DummyPool):
        def __init__(self, conninfo=None, min_size=None, max_size=None, kwargs=None):
            self.conn = TimeoutConn()

    monkeypatch.setattr(db_module, "ConnectionPool", TimeoutPool)
    db = Database("postgresql://user:pass@localhost/db")
    db.migrate(lock_id=123)


def test_migrate_handles_lock_on_alter(monkeypatch) -> None:
    class LockConn(DummyConn):
        def execute(self, query, params=None):
            if "ALTER TABLE access_requests" in query:
                raise db_module.psycopg.errors.QueryCanceled()
            return super().execute(query, params)

    class LockPool(DummyPool):
        def __init__(self, conninfo=None, min_size=None, max_size=None, kwargs=None):
            self.conn = LockConn()

    monkeypatch.setattr(db_module, "ConnectionPool", LockPool)
    db = Database("postgresql://user:pass@localhost/db")
    db.migrate(lock_id=123)


def test_fetchone_and_fetchall_return_dicts(monkeypatch) -> None:
    class RowConn(DummyConn):
        def execute(self, query, params=None):
            if "fetchone" in query:
                return DummyResult(row={"id": 1})
            return DummyResult(row=None, rows=[{"id": 1}, {"id": 2}])

    class RowPool(DummyPool):
        def __init__(self, conninfo=None, min_size=None, max_size=None, kwargs=None):
            self.conn = RowConn()

    monkeypatch.setattr(db_module, "ConnectionPool", RowPool)
    db = Database("postgresql://user:pass@localhost/db")
    assert db.fetchone("fetchone") == {"id": 1}
    assert db.fetchall("fetchall") == [{"id": 1}, {"id": 2}]