"""Tests for the phone-workout GitHub sync pull (crdt-sync transport)."""

from __future__ import annotations

import json
from unittest.mock import MagicMock, patch

from crdt_sync import GitHubSyncError, Hlc, Record
import pytest

from screen_locker import _workout_sync

# The autouse `_isolate_sync_token` fixture in conftest.py already redirects
# `_workout_sync.SYNC_TOKEN_FILE` into a per-test tmp_path, so tests here can
# write to it directly without needing their own isolation fixture.


def _record_json(payload: dict, *, wall_time_ms: int = 1000) -> dict:
    hlc = Hlc(wall_time_ms=wall_time_ms, counter=0, node_id="phone")
    record = Record(id="x", fields={"payload": (payload, hlc)})
    return record.to_dict()


class TestReadSyncToken:
    def test_returns_none_when_file_is_missing(self) -> None:
        assert _workout_sync.read_sync_token() is None

    def test_returns_none_when_file_is_empty(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("   \n")
        assert _workout_sync.read_sync_token() is None

    def test_returns_the_stripped_token(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("  abc123  \n")
        assert _workout_sync.read_sync_token() == "abc123"


class TestLatestPayload:
    def test_returns_none_for_an_empty_log(self) -> None:
        assert _workout_sync._latest_payload("{}") is None

    def test_returns_the_only_records_payload(self) -> None:
        log = {"a": _record_json({"succeeded": True})}
        assert _workout_sync._latest_payload(json.dumps(log)) == {"succeeded": True}

    def test_returns_the_payload_with_the_greatest_clock(self) -> None:
        log = {
            "old": _record_json({"succeeded": False}, wall_time_ms=100),
            "new": _record_json({"succeeded": True}, wall_time_ms=200),
        }
        assert _workout_sync._latest_payload(json.dumps(log)) == {"succeeded": True}

    def test_skips_records_with_no_payload_field(self) -> None:
        no_payload = Record(
            id="a",
            fields={"other": (1, Hlc(wall_time_ms=1, counter=0, node_id="phone"))},
        )
        log = {"a": no_payload.to_dict()}
        assert _workout_sync._latest_payload(json.dumps(log)) is None

    def test_raises_type_error_when_top_level_is_not_an_object(self) -> None:
        with pytest.raises(TypeError, match="not a JSON object"):
            _workout_sync._latest_payload(json.dumps([1, 2, 3]))

    def test_raises_type_error_when_payload_field_is_not_an_object(self) -> None:
        log = {"a": _record_json("not-a-dict")}
        with pytest.raises(TypeError, match="payload field is not a JSON object"):
            _workout_sync._latest_payload(json.dumps(log))

    def test_raises_key_error_for_a_malformed_record(self) -> None:
        log = {"a": {"id": "a"}}  # missing "fields"
        with pytest.raises(KeyError):
            _workout_sync._latest_payload(json.dumps(log))

    def test_raises_value_error_for_invalid_json(self) -> None:
        with pytest.raises(ValueError, match="Expecting property name"):
            _workout_sync._latest_payload("{not valid json")


def _mock_client(*, get_file_text: object) -> MagicMock:
    client = MagicMock()
    if isinstance(get_file_text, Exception):
        client.get_file_text.side_effect = get_file_text
    else:
        client.get_file_text.return_value = get_file_text
    return client


class TestPullSyncedWorkout:
    def test_returns_none_none_when_no_token_is_configured(self) -> None:
        with patch.object(_workout_sync, "GitHubSyncClient") as client_cls:
            assert _workout_sync.pull_synced_workout() == (None, None)
        client_cls.assert_not_called()

    def test_returns_the_error_message_on_a_sync_error(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        client = _mock_client(get_file_text=GitHubSyncError("offline"))
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            assert _workout_sync.pull_synced_workout() == (None, "offline")

    def test_returns_none_none_when_nothing_has_been_pushed_yet(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        client = _mock_client(get_file_text=None)
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            assert _workout_sync.pull_synced_workout() == (None, None)

    def test_returns_the_payload_on_success(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        log = json.dumps({"a": _record_json({"succeeded": True})})
        client = _mock_client(get_file_text=log)
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            assert _workout_sync.pull_synced_workout() == ({"succeeded": True}, None)

    def test_returns_a_corrupt_data_message_on_malformed_sync_data(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        client = _mock_client(get_file_text="{not valid json")
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            data, error = _workout_sync.pull_synced_workout()
        assert data is None
        assert error is not None
        assert "corrupt sync data" in error


def _manual_payload(**extra: object) -> dict:
    payload = {"kind": "manual_workout", "date": "2026-07-13"}
    payload.update(extra)
    return payload


def _manual_record_dict(
    record_id: str, payload: dict, *, wall_time_ms: int = 1000
) -> dict:
    hlc = Hlc(wall_time_ms=wall_time_ms, counter=0, node_id="phone")
    return Record(id=record_id, fields={"payload": (payload, hlc)}).to_dict()


class TestLatestPayloadSkipsManual:
    def test_manual_only_log_yields_no_session(self) -> None:
        log = {"m": _manual_record_dict("manual:1", _manual_payload())}
        assert _workout_sync._latest_payload(json.dumps(log)) is None

    def test_returns_session_even_when_a_later_manual_exists(self) -> None:
        log = {
            "s": _record_json({"succeeded": True}, wall_time_ms=100),
            "m": _manual_record_dict("manual:1", _manual_payload(), wall_time_ms=999),
        }
        assert _workout_sync._latest_payload(json.dumps(log)) == {"succeeded": True}


class TestIsManualPayload:
    def test_true_for_manual_kind(self) -> None:
        assert _workout_sync._is_manual_payload({"kind": "manual_workout"}) is True

    def test_false_for_session_or_non_dict(self) -> None:
        assert _workout_sync._is_manual_payload({"succeeded": True}) is False
        assert _workout_sync._is_manual_payload("not-a-dict") is False


class TestManualRecords:
    def test_returns_only_manual_records(self) -> None:
        log = {
            "s": _record_json({"succeeded": True}),
            "m": _manual_record_dict("manual:1", _manual_payload()),
        }
        result = _workout_sync._manual_records(json.dumps(log))
        assert list(result) == ["manual:1"]

    def test_skips_records_without_a_payload_field(self) -> None:
        no_payload = Record(
            id="a",
            fields={"other": (1, Hlc(wall_time_ms=1, counter=0, node_id="phone"))},
        )
        log = {"a": no_payload.to_dict()}
        assert _workout_sync._manual_records(json.dumps(log)) == {}

    def test_raises_type_error_when_top_level_is_not_an_object(self) -> None:
        with pytest.raises(TypeError, match="not a JSON object"):
            _workout_sync._manual_records(json.dumps([1, 2, 3]))


def _multi_device_client(device_logs: dict[str, object]) -> MagicMock:
    client = MagicMock()
    client.list_directory.return_value = list(device_logs)

    def _get(path: str) -> object:
        device = path.split("/")[-2]
        value = device_logs[device]
        if isinstance(value, Exception):
            raise value
        return value

    client.get_file_text.side_effect = _get
    return client


class TestPullAllManualRecords:
    def test_returns_empty_when_no_token(self) -> None:
        assert _workout_sync.pull_all_manual_records() == []

    def test_returns_empty_when_listing_fails(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        client = MagicMock()
        client.list_directory.side_effect = GitHubSyncError("offline")
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            assert _workout_sync.pull_all_manual_records() == []

    def test_merges_manual_records_across_devices(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        client = _multi_device_client(
            {
                "phone": json.dumps(
                    {"a": _manual_record_dict("manual:a", _manual_payload())}
                ),
                "pc": json.dumps(
                    {"b": _manual_record_dict("manual:b", _manual_payload())}
                ),
            }
        )
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            result = _workout_sync.pull_all_manual_records()
        assert sorted(rid for rid, _ in result) == ["manual:a", "manual:b"]

    def test_skips_missing_and_corrupt_device_logs(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        client = _multi_device_client(
            {
                "phone": json.dumps(
                    {"a": _manual_record_dict("manual:a", _manual_payload())}
                ),
                "gone": GitHubSyncError("404"),
                "empty": None,
                "corrupt": "{not json",
            }
        )
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            result = _workout_sync.pull_all_manual_records()
        assert [rid for rid, _ in result] == ["manual:a"]

    def test_dedups_same_id_keeping_highest_clock(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        client = _multi_device_client(
            {
                "phone": json.dumps(
                    {
                        "a": _manual_record_dict(
                            "manual:a",
                            _manual_payload(cost="OLD"),
                            wall_time_ms=100,
                        )
                    }
                ),
                "pc": json.dumps(
                    {
                        "a": _manual_record_dict(
                            "manual:a",
                            _manual_payload(cost="NEW"),
                            wall_time_ms=200,
                        )
                    }
                ),
            }
        )
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            result = _workout_sync.pull_all_manual_records()
        assert len(result) == 1
        assert result[0][1]["cost"] == "NEW"

    def test_ignores_a_lower_clock_duplicate_seen_later(self) -> None:
        _workout_sync.SYNC_TOKEN_FILE.write_text("tok")
        client = _multi_device_client(
            {
                "phone": json.dumps(
                    {
                        "a": _manual_record_dict(
                            "manual:a",
                            _manual_payload(cost="NEW"),
                            wall_time_ms=200,
                        )
                    }
                ),
                "pc": json.dumps(
                    {
                        "a": _manual_record_dict(
                            "manual:a",
                            _manual_payload(cost="OLD"),
                            wall_time_ms=100,
                        )
                    }
                ),
            }
        )
        with patch.object(_workout_sync, "GitHubSyncClient", return_value=client):
            result = _workout_sync.pull_all_manual_records()
        assert len(result) == 1
        assert result[0][1]["cost"] == "NEW"