import datetime
import re

import pytest

from conftest import outcome_actions

TODAY = datetime.date.today()


@pytest.fixture
def student(dev_client):
    # Instructor launch first so the dev course and roster exist.
    dev_client.post("/dev/launch/dev-instructor")
    dev_client.post("/dev/launch/dev-student-1")
    return dev_client


def next_class_day_iso(page):
    """First offered opt-out date from the student page's select."""
    match = re.search(r'<option value="(\d{4}-\d{2}-\d{2})"', page)
    return match.group(1)


def test_student_home_shows_standing_and_histogram(student):
    page = student.get("/me").get_data(as_text=True)
    assert "answered <strong>0</strong>" in page
    assert "class median is 0" in page
    assert 'class="hist"' in page
    assert "classmate" in page


def test_optout_roundtrip(student):
    page = student.get("/me").get_data(as_text=True)
    day = next_class_day_iso(page)

    resp = student.post("/me/optout", data={"date": day}, follow_redirects=True)
    page = resp.get_data(as_text=True)
    assert f"<td>{day}</td>" in page
    assert "Withdraw" in page

    # Duplicate submissions are ignored, not errors.
    student.post("/me/optout", data={"date": day})
    page = student.get("/me").get_data(as_text=True)
    assert page.count(f"<td>{day}</td>") == 1

    optout_id = re.search(r"/me/optout/(\d+)/delete", page).group(1)
    resp = student.post(f"/me/optout/{optout_id}/delete", follow_redirects=True)
    assert f"<td>{day}</td>" not in resp.get_data(as_text=True)


def test_optout_rejects_non_class_day(student):
    # Dev course meets Tue/Thu; find an upcoming Monday.
    day = TODAY + datetime.timedelta(days=1)
    while day.weekday() != 0:
        day += datetime.timedelta(days=1)
    resp = student.post("/me/optout", data={"date": day.isoformat()})
    assert resp.status_code == 400


def test_optout_rejects_past_date(student):
    resp = student.post(
        "/me/optout",
        data={"date": (TODAY - datetime.timedelta(days=7)).isoformat()},
    )
    assert resp.status_code == 400


def test_optout_affects_instructor_present_count(student):
    page = student.get("/me").get_data(as_text=True)
    day = next_class_day_iso(page)
    student.post("/me/optout", data={"date": day})

    student.post("/dev/launch/dev-instructor")
    page = student.get(f"/instructor/live?date={day}").get_data(as_text=True)
    assert "7 of 8 students available" in page
    assert "(1 opted out)" in page


def test_students_cannot_touch_others_optouts(student):
    page = student.get("/me").get_data(as_text=True)
    day = next_class_day_iso(page)
    student.post("/me/optout", data={"date": day})
    page = student.get("/me").get_data(as_text=True)
    optout_id = re.search(r"/me/optout/(\d+)/delete", page).group(1)

    student.post("/dev/launch/dev-student-2")
    assert student.post(f"/me/optout/{optout_id}/delete").status_code == 404


def test_assessment_visibility_setting(student):
    # Record an answered call for dev-student-1 as the instructor.
    student.post("/dev/launch/dev-instructor")
    day = TODAY.isoformat()
    # Draw live calls until dev-student-1 comes up, resolving each.
    for _ in range(200):
        student.post("/instructor/live/next", data={"date": day})
        page = student.get(f"/instructor/live?date={day}").get_data(as_text=True)
        call_id = re.search(r"/instructor/call/(\d+)/outcome", page).group(1)
        target = "Ada Lovelace" in page
        student.post(
            f"/instructor/call/{call_id}/outcome",
            data={"action": outcome_actions(page)["POOR"]},
        )
        if target:
            break

    student.post("/dev/launch/dev-student-1")
    page = student.get("/me").get_data(as_text=True)
    assert "POOR" in page

    # Turn visibility off; the outcome shows as just "answered".
    student.post("/dev/launch/dev-instructor")
    student.post(
        "/instructor/settings",
        data={"selection_mode": "weighted", "weight_factor": "2"},
    )
    student.post("/dev/launch/dev-student-1")
    page = student.get("/me").get_data(as_text=True)
    assert "POOR" not in page
    assert "answered" in page