import logging

import pytest

from kanta import Kanta
from kanta.callbacks import DictPost, DictPre

from .support import Data, make_kanta, read_changes


def test_logheader_rejects_async(tmp_path, format_config):
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    with pytest.raises(TypeError, match="must not be async"):

        @kanta.logheader
        async def header(action: str) -> str:
            return action


def test_logheader_rejects_bad_return_annotation(tmp_path, format_config):
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    with pytest.raises(TypeError, match="must return"):

        @kanta.logheader
        def header(action: str) -> int:
            return 1


def test_logheader_rejects_unknown_annotation(tmp_path, format_config):
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    with pytest.raises(TypeError, match="unsupported annotation"):

        @kanta.logheader
        def header(action: str, bogus: int) -> str:
            return action


@pytest.mark.asyncio
async def test_logheader_replaces_default_header(tmp_path, format_config, caplog):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    @kanta.logheader
    def header(action: str, user: str | None, extra: dict | None) -> str:
        return f"HDR {action} user={user} session={extra['session']}"

    await kanta.open(log=False)
    with kanta.transaction(action="update", user="alice", extra={"session": 3}) as data:
        data.counter = 1
    await kanta.close()

    assert "HDR update user=alice session=3" in caplog.text
    # The diff body is still logged after the custom header.
    assert "counter" in caplog.text


@pytest.mark.asyncio
async def test_logheader_default_target_is_filename(tmp_path, format_config, caplog):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "mydb.db", Data, format_config)

    @kanta.logheader
    def header(action: str, extra: dict | None) -> str:
        return f"target={extra['target']}"

    await kanta.open(log=False)
    with kanta.transaction(action="update") as data:
        data.counter = 1
    await kanta.close()

    assert "target=mydb.db" in caplog.text


@pytest.mark.asyncio
async def test_logheader_explicit_target_kept(tmp_path, format_config, caplog):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "mydb.db", Data, format_config)

    @kanta.logheader
    def header(action: str, extra: dict | None) -> str:
        return f"target={extra['target']}"

    await kanta.open(log=False)
    with kanta.transaction(
        action="update", extra={"target": "Project X (abcd1234)"}
    ) as data:
        data.counter = 1
    await kanta.close()

    assert "target=Project X (abcd1234)" in caplog.text


@pytest.mark.asyncio
async def test_logheader_injects_states_and_kanta(tmp_path, format_config, caplog):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    @kanta.logheader
    def header(
        action: str,
        previous: DictPre,
        current: DictPost,
        kanta: Kanta,
    ) -> str:
        return (
            f"{action} counter {previous.get('counter')}"
            f" -> {current.get('counter')} db={kanta.filename.name}"
        )

    await kanta.open(log=False)
    with kanta.transaction(action="increment") as data:
        data.counter = 5
    await kanta.close()

    assert "increment counter 0 -> 5 db=test.db" in caplog.text


@pytest.mark.asyncio
async def test_logheader_chain_first_non_none_wins(tmp_path, format_config, caplog):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    @kanta.logheader
    def first(action: str) -> str | None:
        return None

    @kanta.logheader
    def second(action: str) -> str:
        return f"SECOND {action}"

    await kanta.open(log=False)
    with kanta.transaction(action="update") as data:
        data.counter = 1
    await kanta.close()

    assert "SECOND update" in caplog.text


@pytest.mark.asyncio
async def test_logheader_all_none_falls_back_to_default(
    tmp_path, format_config, caplog
):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    @kanta.logheader
    def header(action: str) -> str | None:
        return None

    await kanta.open(log=False)
    with kanta.transaction(action="update", user="alice") as data:
        data.counter = 1
    await kanta.close()

    assert "update" in caplog.text
    assert "alice" in caplog.text


@pytest.mark.asyncio
async def test_logheader_receives_formatted_user(tmp_path, format_config, caplog):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    @kanta.logfmt(path="$user")
    def resolve_user(value: str) -> str | None:
        return "Alice"

    @kanta.logheader
    def header(action: str, user: str | None) -> str:
        return f"actor={user}"

    await kanta.open(log=False)
    with kanta.transaction(action="update", user="uuid-1") as data:
        data.counter = 1
    await kanta.close()

    assert "actor=Alice" in caplog.text


@pytest.mark.asyncio
async def test_logheader_applies_to_bootstrap(tmp_path, format_config, caplog):
    caplog.set_level(logging.INFO, logger="kanta.bootstrap")
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    @kanta.logheader
    def header(action: str, extra: dict | None) -> str:
        return f"BOOT {action} target={extra['target']}"

    await kanta.open()
    await kanta.close()

    assert "BOOT bootstrap target=test.db" in caplog.text


@pytest.mark.asyncio
async def test_transaction_extra_string_in_default_header(
    tmp_path, format_config, caplog
):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    await kanta.open(log=False)
    with kanta.transaction(action="export", extra="mydb.db") as data:
        data.counter = 1
    await kanta.close()

    assert "export" in caplog.text
    assert "mydb.db" in caplog.text


@pytest.mark.asyncio
async def test_extra_is_not_persisted(tmp_path, format_config):
    path = tmp_path / "test.db"
    kanta = make_kanta(path, Data, format_config)

    await kanta.open(log=False)
    with kanta.transaction(
        action="update", user="alice", extra={"session": 3, "target": "X"}
    ) as data:
        data.counter = 1
    await kanta.close()

    record = read_changes(path, format_config)[-1]
    assert record.a == "update"
    assert record.u == "alice"


@pytest.mark.asyncio
async def test_transaction_log_dict_toggles(tmp_path, format_config, caplog):
    caplog.set_level(logging.INFO, logger="kanta.transaction")
    kanta = make_kanta(tmp_path / "test.db", Data, format_config)

    await kanta.open(log=False)
    with kanta.transaction(
        action="myaction", log={"header": True, "diff": False}
    ) as data:
        data.counter = 1
    with kanta.transaction(
        action="otheraction", log={"header": False, "diff": True}
    ) as data:
        data.counter = 2
    await kanta.close()

    # First transaction: header only.
    assert "myaction" in caplog.text
    # Second transaction: diff only, no header.
    assert "otheraction" not in caplog.text
    assert "counter" in caplog.text