"""Tests du moteur de validation — un cas passant et un cas déclenchant par
règle, plus les cas limites de la sémantique figée (CLAUDE.md § 3)."""

import datetime as dt

from app.validation import (
    AvailabilityWindow,
    DayPartWindow,
    Severity,
    ShiftInfo,
    ValidationInput,
    ViolationCode,
    has_blocking,
    validate,
)

DAY_PARTS = (
    DayPartWindow("MORNING", dt.time(6, 0), dt.time(13, 0), 0),
    DayPartWindow("AFTERNOON", dt.time(13, 0), dt.time(19, 0), 1),
    DayPartWindow("EVENING", dt.time(19, 0), dt.time(6, 0), 2),
)


def _dt(day: int, hour: int, minute: int = 0) -> dt.datetime:
    return dt.datetime(2026, 7, day, hour, minute)


def _shift(sid: str, start: dt.datetime, end: dt.datetime) -> ShiftInfo:
    return ShiftInfo(id=sid, starts_at=start, ends_at=end)


def _codes(violations) -> list[ViolationCode]:
    return [v.code for v in violations]


def _win(day: int, start_h: int, end_h: int) -> AvailabilityWindow:
    """Fenêtre de dispo le <day> juillet, de start_h:00 à end_h:00.
    `end_h <= start_h` ⇒ se termine le lendemain."""
    return AvailabilityWindow(
        dt.date(2026, 7, day), dt.time(start_h % 24, 0), dt.time(end_h % 24, 0)
    )


# --------------------------------------------------------------------------- #
# SHIFT_OVERLAP                                                               #
# --------------------------------------------------------------------------- #
def test_overlap_pass_when_shifts_are_adjacent():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
        existing_shifts=(_shift("e", _dt(10, 18), _dt(10, 22)),),
        availabilities=(_win(10, 8, 23),),
    )
    assert ViolationCode.SHIFT_OVERLAP not in _codes(validate(data))


def test_overlap_triggers_and_is_blocking():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
        existing_shifts=(_shift("e", _dt(10, 16), _dt(10, 20)),),
        availabilities=(_win(10, 8, 23),),
    )
    violations = validate(data)
    overlap = [v for v in violations if v.code is ViolationCode.SHIFT_OVERLAP]
    assert len(overlap) == 1
    assert overlap[0].severity is Severity.BLOCKING
    assert overlap[0].params["other_shift_id"] == "e"
    assert has_blocking(violations) is True


# --------------------------------------------------------------------------- #
# OUTSIDE_AVAILABILITY                                                        #
# --------------------------------------------------------------------------- #
def test_availability_pass_when_shift_within_declared_window():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
        availabilities=(_win(10, 13, 19),),
    )
    assert validate(data) == []


def test_availability_pass_when_window_exactly_matches_shift():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
        availabilities=(_win(10, 14, 18),),
    )
    assert validate(data) == []


def test_availability_triggers_when_nothing_declared():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
    )
    violations = validate(data)
    assert _codes(violations) == [ViolationCode.OUTSIDE_AVAILABILITY]
    assert violations[0].severity is Severity.WARNING
    assert violations[0].params["date"] == "2026-07-10"
    assert violations[0].params["uncovered_minutes"] == 240


def test_availability_triggers_on_partial_coverage_and_counts_the_gap():
    # Créneau 16:00 -> 20:00 ; dispo seulement 13:00 -> 19:00 ⇒ 60 min à découvert.
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 16), _dt(10, 20)),
        availabilities=(_win(10, 13, 19),),
    )
    violations = validate(data)
    assert _codes(violations) == [ViolationCode.OUTSIDE_AVAILABILITY]
    assert violations[0].params["uncovered_minutes"] == 60


def test_availability_union_of_several_windows_covers_the_shift():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 12), _dt(10, 20)),
        availabilities=(_win(10, 12, 16), _win(10, 15, 20)),
    )
    assert validate(data) == []


def test_availability_midnight_crossing_window_covers_night_shift():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 22), _dt(11, 2)),
        availabilities=(_win(10, 19, 4),),  # 19:00 -> 04:00 le lendemain
    )
    assert validate(data) == []


def test_availability_gap_between_two_windows_is_flagged():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 10), _dt(10, 18)),
        availabilities=(_win(10, 10, 12), _win(10, 14, 18)),  # trou 12:00-14:00
    )
    violations = validate(data)
    assert _codes(violations) == [ViolationCode.OUTSIDE_AVAILABILITY]
    assert violations[0].params["uncovered_minutes"] == 120


# --------------------------------------------------------------------------- #
# DAILY_HOURS_EXCEEDED                                                        #
# --------------------------------------------------------------------------- #
def test_daily_hours_pass_at_exactly_eight():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 9), _dt(10, 17)),  # 8 h pile
        day_parts=DAY_PARTS,
        availabilities=(_win(10, 8, 18),),
    )
    assert ViolationCode.DAILY_HOURS_EXCEEDED not in _codes(validate(data))


def test_daily_hours_triggers_above_eight():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 9), _dt(10, 17)),  # 8 h
        existing_shifts=(_shift("e", _dt(10, 20), _dt(10, 20, 30)),),  # +30 min
        day_parts=DAY_PARTS,
    )
    violations = [
        v for v in validate(data) if v.code is ViolationCode.DAILY_HOURS_EXCEEDED
    ]
    assert len(violations) == 1
    assert violations[0].params["total_minutes"] == 510
    assert violations[0].params["date"] == "2026-07-10"


def test_daily_hours_day_starts_at_first_day_part_boundary():
    # Frontière de journée = 06:00 (début de MORNING). Un créneau de nuit qui
    # commence à 03:00 le 11 appartient à la journée du 10.
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 8), _dt(10, 15)),  # 7 h, journée 10
        existing_shifts=(_shift("e", _dt(11, 3), _dt(11, 5)),),  # 2 h, journée 10
        day_parts=DAY_PARTS,
    )
    violations = [
        v for v in validate(data) if v.code is ViolationCode.DAILY_HOURS_EXCEEDED
    ]
    assert len(violations) == 1
    assert violations[0].params["date"] == "2026-07-10"


def test_daily_hours_ignores_other_days():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 9), _dt(10, 17)),  # 8 h journée 10
        existing_shifts=(_shift("e", _dt(9, 9), _dt(9, 17)),),  # 8 h journée 9
        day_parts=DAY_PARTS,
    )
    assert ViolationCode.DAILY_HOURS_EXCEEDED not in _codes(validate(data))


# --------------------------------------------------------------------------- #
# INSUFFICIENT_REST                                                          #
# --------------------------------------------------------------------------- #
def test_rest_pass_with_more_than_eight_hours_gap():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 8), _dt(10, 12)),
        existing_shifts=(_shift("e", _dt(9, 18), _dt(9, 23)),),  # écart 9 h
        availabilities=(_win(10, 8, 12),),
    )
    assert ViolationCode.INSUFFICIENT_REST not in _codes(validate(data))


def test_rest_pass_at_exactly_eight_hours():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 4), _dt(10, 12)),
        existing_shifts=(_shift("e", _dt(10, 20), _dt(10, 22)),),  # écart 8 h pile
    )
    assert ViolationCode.INSUFFICIENT_REST not in _codes(validate(data))


def test_rest_triggers_for_shift_before():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 10), _dt(10, 14)),
        existing_shifts=(_shift("e", _dt(10, 2), _dt(10, 6)),),  # écart 4 h
    )
    violations = [
        v for v in validate(data) if v.code is ViolationCode.INSUFFICIENT_REST
    ]
    assert len(violations) == 1
    assert violations[0].params["direction"] == "BEFORE"
    assert violations[0].params["gap_minutes"] == 240


def test_rest_triggers_for_shift_after():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 10), _dt(10, 14)),
        existing_shifts=(_shift("e", _dt(10, 18), _dt(10, 20)),),  # écart 4 h
    )
    violations = [
        v for v in validate(data) if v.code is ViolationCode.INSUFFICIENT_REST
    ]
    assert len(violations) == 1
    assert violations[0].params["direction"] == "AFTER"


def test_back_to_back_shifts_are_rest_violation_not_overlap():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
        existing_shifts=(_shift("e", _dt(10, 18), _dt(10, 22)),),
        availabilities=(_win(10, 8, 23),),
    )
    codes = _codes(validate(data))
    assert ViolationCode.SHIFT_OVERLAP not in codes
    assert ViolationCode.INSUFFICIENT_REST in codes


# --------------------------------------------------------------------------- #
# Combinaisons                                                                #
# --------------------------------------------------------------------------- #
def test_clean_assignment_has_no_violation():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
        existing_shifts=(_shift("e", _dt(9, 8), _dt(9, 12)),),
        day_parts=DAY_PARTS,
        availabilities=(_win(10, 13, 19),),
    )
    assert validate(data) == []


def test_multiple_rules_fire_together():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
        existing_shifts=(_shift("e", _dt(10, 16), _dt(10, 20)),),  # chevauchement
        # aucune dispo déclarée ⇒ OUTSIDE_AVAILABILITY
    )
    codes = set(_codes(validate(data)))
    assert {
        ViolationCode.SHIFT_OVERLAP,
        ViolationCode.OUTSIDE_AVAILABILITY,
    } <= codes
    assert has_blocking(validate(data)) is True


def test_only_warnings_is_not_blocking():
    data = ValidationInput(
        candidate_shift=_shift("c", _dt(10, 14), _dt(10, 18)),
        # pas de dispo ⇒ un seul avertissement OUTSIDE_AVAILABILITY
    )
    violations = validate(data)
    assert _codes(violations) == [ViolationCode.OUTSIDE_AVAILABILITY]
    assert has_blocking(violations) is False