import json
import pytest
import shutil
import tempfile
from pathlib import Path

from datastore import DatastoreEngine
from garmin_sync import GarminSyncClient, GarminMirrorWriter, sync_date_range, generate_date_list


@pytest.fixture
def temp_data_dir():
    temp_dir = tempfile.mkdtemp(prefix="garmin_test_")
    data_dir = Path(temp_dir)
    # create standard dirs
    (data_dir / "garmin").mkdir(parents=True)
    yield data_dir
    shutil.rmtree(temp_dir)


def test_garmin_sync_mock_and_idempotency(temp_data_dir):
    client = GarminSyncClient(token_dir=temp_data_dir, mock=True)
    writer = GarminMirrorWriter(temp_data_dir)

    dates = ["2026-10-01", "2026-10-02"]
    sync_date_range(client, writer, dates)

    daily_file = temp_data_dir / "garmin" / "daily" / "2026-10.jsonl"
    sleep_file = temp_data_dir / "garmin" / "sleep" / "2026-10.jsonl"
    activities_file = temp_data_dir / "garmin" / "activities" / "2026-10.jsonl"

    assert daily_file.is_file()
    assert sleep_file.is_file()
    assert activities_file.is_file()

    # Read daily lines
    with open(daily_file) as f:
        daily_lines = [json.loads(line) for line in f if line.strip()]
    assert len(daily_lines) == 2
    assert daily_lines[0]["calendarDate"] == "2026-10-01"
    assert daily_lines[1]["calendarDate"] == "2026-10-02"

    # Re-syncing 2026-10-01 must not create duplicates (idempotent upsert)
    sync_date_range(client, writer, ["2026-10-01"])

    with open(daily_file) as f:
        daily_lines_after = [json.loads(line) for line in f if line.strip()]
    assert len(daily_lines_after) == 2

    # Check activities
    with open(activities_file) as f:
        act_lines = [json.loads(line) for line in f if line.strip()]
    # Mock returns activityId 987654321 for each day, so deduplication keeps 1 record with latest info
    assert len(act_lines) == 1
    assert act_lines[0]["activityId"] == 987654321


def test_generate_date_list():
    dates = generate_date_list("2026-09-28", "2026-10-01")
    assert dates == ["2026-09-28", "2026-09-29", "2026-09-30", "2026-10-01"]

    # Reversed dates should automatically normalize
    dates_rev = generate_date_list("2026-10-01", "2026-09-28")
    assert dates_rev == ["2026-09-28", "2026-09-29", "2026-09-30", "2026-10-01"]


def test_garmin_auth_error_handling(temp_data_dir):
    # Non-mock client with empty dir should raise FileNotFoundError
    with pytest.raises(FileNotFoundError):
        GarminSyncClient(token_dir=temp_data_dir, mock=False)