from typing import Any

import pytest
from conftest import DEFAULT_URI  # type: ignore
from langchain_core.runnables import RunnableConfig

from langgraph.checkpoint.base import (
    Checkpoint,
    CheckpointMetadata,
    create_checkpoint,
    empty_checkpoint,
)
from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver


class TestAsyncPostgresSaver:
    @pytest.fixture(autouse=True)
    async def setup(self) -> None:
        # objects for test setup
        self.config_1: RunnableConfig = {
            "configurable": {
                "thread_id": "thread-1",
                # for backwards compatibility testing
                "thread_ts": "1",
                "checkpoint_ns": "",
            }
        }
        self.config_2: RunnableConfig = {
            "configurable": {
                "thread_id": "thread-2",
                "checkpoint_id": "2",
                "checkpoint_ns": "",
            }
        }
        self.config_3: RunnableConfig = {
            "configurable": {
                "thread_id": "thread-2",
                "checkpoint_id": "2-inner",
                "checkpoint_ns": "inner",
            }
        }

        self.chkpnt_1: Checkpoint = empty_checkpoint()
        self.chkpnt_2: Checkpoint = create_checkpoint(self.chkpnt_1, {}, 1)
        self.chkpnt_3: Checkpoint = empty_checkpoint()

        self.metadata_1: CheckpointMetadata = {
            "source": "input",
            "step": 2,
            "writes": {},
            "score": 1,
        }
        self.metadata_2: CheckpointMetadata = {
            "source": "loop",
            "step": 1,
            "writes": {"foo": "bar"},
            "score": None,
        }
        self.metadata_3: CheckpointMetadata = {}
        async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
            await saver.setup()

    async def test_asearch(self) -> None:
        async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
            await saver.aput(self.config_1, self.chkpnt_1, self.metadata_1, {})
            await saver.aput(self.config_2, self.chkpnt_2, self.metadata_2, {})
            await saver.aput(self.config_3, self.chkpnt_3, self.metadata_3, {})

            # call method / assertions
            query_1 = {"source": "input"}  # search by 1 key
            query_2 = {
                "step": 1,
                "writes": {"foo": "bar"},
            }  # search by multiple keys
            query_3: dict[str, Any] = {}  # search by no keys, return all checkpoints
            query_4 = {"source": "update", "step": 1}  # no match

            search_results_1 = [c async for c in saver.alist(None, filter=query_1)]
            assert len(search_results_1) == 1
            assert search_results_1[0].metadata == self.metadata_1

            search_results_2 = [c async for c in saver.alist(None, filter=query_2)]
            assert len(search_results_2) == 1
            assert search_results_2[0].metadata == self.metadata_2

            search_results_3 = [c async for c in saver.alist(None, filter=query_3)]
            assert len(search_results_3) == 3

            search_results_4 = [c async for c in saver.alist(None, filter=query_4)]
            assert len(search_results_4) == 0

            # search by config (defaults to checkpoints across all namespaces)
            search_results_5 = [
                c
                async for c in saver.alist({"configurable": {"thread_id": "thread-2"}})
            ]
            assert len(search_results_5) == 2
            assert {
                search_results_5[0].config["configurable"]["checkpoint_ns"],
                search_results_5[1].config["configurable"]["checkpoint_ns"],
            } == {"", "inner"}

            # TODO: test before and limit params

    async def test_null_chars(self) -> None:
        async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
            config = await saver.aput(
                self.config_1, self.chkpnt_1, {"my_key": "\x00abc"}, {}
            )
            assert (await saver.aget_tuple(config)).metadata["my_key"] == "abc"
            assert [c async for c in saver.alist(None, filter={"my_key": "abc"})][
                0
            ].metadata["my_key"] == "abc"