from datetime import datetime, timedelta, timezone

from app.availability_service import (
    get_week_boundaries,
    is_participant_free,
)


def test_get_week_boundaries_returns_monday_to_friday():
    wednesday = datetime(2026, 1, 7, 12, 0, 0, tzinfo=timezone.utc)
    monday, friday = get_week_boundaries(wednesday)

    assert monday.weekday() == 0
    assert friday.weekday() == 4
    assert monday.hour == 0
    assert friday.hour == 23


def test_get_week_boundaries_monday_input():
    monday_input = datetime(2026, 1, 5, 12, 0, 0, tzinfo=timezone.utc)
    monday, friday = get_week_boundaries(monday_input)

    assert monday.day == 5
    assert friday.day == 9


def test_is_participant_free_no_blocks():
    slot_start = datetime(2026, 1, 6, 10, 0, 0, tzinfo=timezone.utc)
    slot_end = datetime(2026, 1, 6, 11, 0, 0, tzinfo=timezone.utc)

    assert is_participant_free([], slot_start, slot_end) is True


def test_is_participant_free_with_non_overlapping_block():
    slot_start = datetime(2026, 1, 6, 10, 0, 0, tzinfo=timezone.utc)
    slot_end = datetime(2026, 1, 6, 11, 0, 0, tzinfo=timezone.utc)

    busy_blocks = [
        (
            datetime(2026, 1, 6, 14, 0, 0, tzinfo=timezone.utc),
            datetime(2026, 1, 6, 15, 0, 0, tzinfo=timezone.utc),
        )
    ]

    assert is_participant_free(busy_blocks, slot_start, slot_end) is True


def test_is_participant_busy_with_overlapping_block():
    slot_start = datetime(2026, 1, 6, 10, 0, 0, tzinfo=timezone.utc)
    slot_end = datetime(2026, 1, 6, 11, 0, 0, tzinfo=timezone.utc)

    busy_blocks = [
        (
            datetime(2026, 1, 6, 10, 30, 0, tzinfo=timezone.utc),
            datetime(2026, 1, 6, 11, 30, 0, tzinfo=timezone.utc),
        )
    ]

    assert is_participant_free(busy_blocks, slot_start, slot_end) is False


def test_is_participant_busy_with_containing_block():
    slot_start = datetime(2026, 1, 6, 10, 0, 0, tzinfo=timezone.utc)
    slot_end = datetime(2026, 1, 6, 11, 0, 0, tzinfo=timezone.utc)

    busy_blocks = [
        (
            datetime(2026, 1, 6, 9, 0, 0, tzinfo=timezone.utc),
            datetime(2026, 1, 6, 12, 0, 0, tzinfo=timezone.utc),
        )
    ]

    assert is_participant_free(busy_blocks, slot_start, slot_end) is False