from datetime import timedelta

import pytest
from django.urls import reverse
from django.utils import timezone

from apps.accounts.models import User, UserRole
from apps.bookings.models import Booking, BookingStatus
from apps.salons.models import Salon, Service, StaffAvailability, StaffProfile


@pytest.fixture
def base_entities():
    owner = User.objects.create_user(email="owner@example.com", password="pass", role=UserRole.MANAGER)
    customer = User.objects.create_user(email="customer@example.com", password="pass")
    staff_user = User.objects.create_user(email="staff@example.com", password="pass", role=UserRole.STAFF)

    salon = Salon.objects.create(
        owner=owner,
        name="Main Salon",
        description="",
        address="123 King Rd",
        city="Riyadh",
        phone_number="0512345678",
    )
    service = Service.objects.create(
        salon=salon,
        name="Haircut",
        description="",
        duration_minutes=60,
        price_amount=120,
        currency="SAR",
    )
    staff = StaffProfile.objects.create(user=staff_user, salon=salon)
    return customer, staff, service


def booking_payload(service, staff, start_time, end_time, notes=""):
    return {
        "service": service.id,
        "staff": staff.id if staff else None,
        "start_time": start_time.isoformat(),
        "end_time": end_time.isoformat(),
        "notes": notes,
    }


def next_day_at(hour, minute=0):
    now = timezone.now()
    target = now + timedelta(days=1)
    return target.replace(hour=hour, minute=minute, second=0, microsecond=0)


@pytest.mark.django_db
def test_requires_staff_assignment(client, base_entities):
    customer, staff, service = base_entities
    client.force_login(customer)

    start_time = next_day_at(9)
    end_time = start_time + timedelta(minutes=service.duration_minutes)
    payload = booking_payload(service, None, start_time, end_time)

    response = client.post(
        reverse("booking-list"),
        payload,
        content_type="application/json",
    )

    assert response.status_code == 400
    assert "staff" in response.json()


@pytest.mark.django_db
def test_rejects_end_before_start(client, base_entities):
    customer, staff, service = base_entities
    client.force_login(customer)

    start_time = next_day_at(9)
    end_time = start_time - timedelta(minutes=service.duration_minutes)
    payload = booking_payload(service, staff, start_time, end_time)

    response = client.post(
        reverse("booking-list"),
        payload,
        content_type="application/json",
    )

    assert response.status_code == 400
    assert "end_time" in response.json()


@pytest.mark.django_db
def test_rejects_duration_mismatch(client, base_entities):
    customer, staff, service = base_entities
    client.force_login(customer)

    start_time = next_day_at(9)
    end_time = start_time + timedelta(minutes=30)
    payload = booking_payload(service, staff, start_time, end_time)

    response = client.post(
        reverse("booking-list"),
        payload,
        content_type="application/json",
    )

    assert response.status_code == 400
    assert "end_time" in response.json()


@pytest.mark.django_db
def test_rejects_outside_availability_when_defined(client, base_entities):
    customer, staff, service = base_entities
    client.force_login(customer)

    start_time = next_day_at(8)
    end_time = start_time + timedelta(minutes=service.duration_minutes)

    StaffAvailability.objects.create(
        staff=staff,
        day_of_week=start_time.weekday(),
        start_time=timezone.datetime(2000, 1, 1, 9, 0).time(),
        end_time=timezone.datetime(2000, 1, 1, 17, 0).time(),
    )

    payload = booking_payload(service, staff, start_time, end_time)
    response = client.post(
        reverse("booking-list"),
        payload,
        content_type="application/json",
    )

    assert response.status_code == 400
    assert "start_time" in response.json()


@pytest.mark.django_db
def test_allows_booking_without_availability_records(client, base_entities):
    customer, staff, service = base_entities
    client.force_login(customer)

    start_time = next_day_at(10)
    end_time = start_time + timedelta(minutes=service.duration_minutes)

    payload = booking_payload(service, staff, start_time, end_time)
    response = client.post(
        reverse("booking-list"),
        payload,
        content_type="application/json",
    )

    assert response.status_code == 201


@pytest.mark.django_db
def test_rejects_overlapping_pending_or_confirmed_bookings(client, base_entities):
    customer, staff, service = base_entities
    client.force_login(customer)

    start_time = next_day_at(9)
    end_time = start_time + timedelta(minutes=service.duration_minutes)

    Booking.objects.create(
        salon=service.salon,
        customer=customer,
        service=service,
        staff=staff,
        start_time=start_time,
        end_time=end_time,
        status=BookingStatus.CONFIRMED,
        price_amount=service.price_amount,
        currency=service.currency,
        notes="",
    )

    overlap_start = start_time + timedelta(minutes=30)
    overlap_end = overlap_start + timedelta(minutes=service.duration_minutes)
    payload = booking_payload(service, staff, overlap_start, overlap_end)

    response = client.post(
        reverse("booking-list"),
        payload,
        content_type="application/json",
    )

    assert response.status_code == 400
    assert "start_time" in response.json()


@pytest.mark.django_db
def test_allows_overlap_with_cancelled_or_completed(client, base_entities):
    customer, staff, service = base_entities
    client.force_login(customer)

    start_time = next_day_at(9)
    end_time = start_time + timedelta(minutes=service.duration_minutes)

    Booking.objects.create(
        salon=service.salon,
        customer=customer,
        service=service,
        staff=staff,
        start_time=start_time,
        end_time=end_time,
        status=BookingStatus.CANCELLED,
        price_amount=service.price_amount,
        currency=service.currency,
        notes="",
    )

    overlap_start = start_time + timedelta(minutes=30)
    overlap_end = overlap_start + timedelta(minutes=service.duration_minutes)
    payload = booking_payload(service, staff, overlap_start, overlap_end)

    response = client.post(
        reverse("booking-list"),
        payload,
        content_type="application/json",
    )

    assert response.status_code == 201