"""
Tests for weekly repeating capacity.

A single capacity row is created for the nearest future Thursday, repeating
every 7 days.  The tests verify:
  - each Thursday in the series accepts bookings
  - days that are not Thursday are rejected
  - a slot that has reached capacity (capacity=1) is rejected on re-submission

Fixture chain (module-scoped):
    repeating_timetable_id -> repeating_capacity_id
    repeating_timetable_id -> repeating_form_id
"""

import os
from datetime import date, timedelta
import requests
import pytest

BASE_URL = os.environ.get("WP_BASE_URL", "http://localhost/wordpress")
API = f"{BASE_URL}/wp-json/reservations/v1"


def _next_thursday() -> date:
    """Nearest Thursday at least 7 days from today."""
    d = date.today() + timedelta(days=7)
    while d.weekday() != 3:   # 3 = Thursday
        d += timedelta(days=1)
    return d


THURSDAY        = _next_thursday()
FRIDAY          = THURSDAY + timedelta(days=1)
THURSDAY_WEEK_2 = THURSDAY + timedelta(weeks=1)
THURSDAY_WEEK_3 = THURSDAY + timedelta(weeks=2)


def slot(day: date, time: str = "09:00:00") -> str:
    return f"{day.isoformat()}T{time}+00:00"


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------

@pytest.fixture(scope="module")
def repeating_timetable_id():
    r = requests.post(f"{API}/timetable", json={
        "name": "Weekly Thursday timetable",
        "block_size": 60,
    })
    assert r.status_code == 201, r.text
    return r.json()["id"]


@pytest.fixture(scope="module")
def repeating_capacity_id(repeating_timetable_id):
    r = requests.post(f"{API}/timetable/{repeating_timetable_id}/capacity", json={
        "capacity": 1,
        "min_lead_time_minutes": 0,
        "date": THURSDAY.isoformat(),
        "start_time": "08:00",
        "end_time": "18:00",
        "repeat_period_in_days": 7,
        "repeat_times": 52,
    })
    print(r.json())
    assert r.status_code == 201, r.text
    return r.json()["ids"][0]


@pytest.fixture(scope="module")
def repeating_form_id(repeating_timetable_id):
    r = requests.post(f"{API}/form-definition", json={
        "name": "Weekly Thursday form",
        "definition": {
            "email_key": "email",
            "elements": [
                {
                    "type": "reservation",
                    "name": "reservation",
                    "label": "Book a slot",
                    "calendar_id": str(repeating_timetable_id),
                    "required": True,
                },
                {
                    "type": "input-text",
                    "name": "email",
                    "label": "Email",
                    "required": True,
                    "validation": "email",
                },
                {
                    "type": "button",
                    "name": "submit",
                    "label": "Submit",
                },
            ],
        },
    })
    assert r.status_code == 201, r.text
    return r.json()["id"]


def book(form_id, timetable_id, day: date, time: str = "09:00:00"):
    return requests.post(f"{API}/form/{form_id}", json={
        "email": "user@example.com",
        "reservation": {
            "timetable_id": timetable_id,
            "timetable_reservations": [slot(day, time)],
        },
    })


def assert_not_available(r):
    body = r.json()
    assert body["success"] is False, f"Expected failure but got: {body}"
    error = next((e for e in body["errors"] if e["element"] == "reservation"), None)
    assert error is not None
    assert error["code"] == "not_available"


# ---------------------------------------------------------------------------
# Tests
# ---------------------------------------------------------------------------

class TestRepeatingCapacity:
    def test_first_thursday_is_available(
        self, repeating_form_id, repeating_timetable_id, repeating_capacity_id
    ):
        r = book(repeating_form_id, repeating_timetable_id, THURSDAY)
        assert r.json()["success"] is True, r.text

    def test_first_thursday_is_full_after_booking(
        self, repeating_form_id, repeating_timetable_id, repeating_capacity_id
    ):
        # capacity=1; the slot booked above is now exhausted
        r = book(repeating_form_id, repeating_timetable_id, THURSDAY)
        assert_not_available(r)

    def test_friday_is_not_available(
        self, repeating_form_id, repeating_timetable_id, repeating_capacity_id
    ):
        r = book(repeating_form_id, repeating_timetable_id, FRIDAY)
        assert_not_available(r)

    def test_second_thursday_is_available(
        self, repeating_form_id, repeating_timetable_id, repeating_capacity_id
    ):
        r = book(repeating_form_id, repeating_timetable_id, THURSDAY_WEEK_2)
        assert r.json()["success"] is True, r.text

    def test_third_thursday_is_available(
        self, repeating_form_id, repeating_timetable_id, repeating_capacity_id
    ):
        r = book(repeating_form_id, repeating_timetable_id, THURSDAY_WEEK_3)
        assert r.json()["success"] is True, r.text

    def test_wednesday_before_second_thursday_is_not_available(
        self, repeating_form_id, repeating_timetable_id, repeating_capacity_id
    ):
        wednesday = THURSDAY_WEEK_2 - timedelta(days=1)
        r = book(repeating_form_id, repeating_timetable_id, wednesday)
        assert_not_available(r)