import pytest
from sqlalchemy import text

from web.app import app
from web.db import (
    db_init,
    create_or_update_user,
    list_email_templates,
    update_email_template,
    _ensure_session,
    ensure_default_email_template,
)
from web.email_templates import render_job_alert_email


@pytest.fixture(scope="function", autouse=True)
def setup_database():
    app.config.update(TESTING=True, WTF_CSRF_ENABLED=False)
    with app.app_context():
        db_init()
        create_or_update_user("admin", password="secret", is_admin=True, is_active=True)
    with _ensure_session() as session:
        session.execute(text("DELETE FROM email_templates"))
        session.commit()
    ensure_default_email_template()
    yield
    with _ensure_session() as session:
        session.execute(text("DELETE FROM email_templates"))
        session.commit()
    ensure_default_email_template()


@pytest.fixture
def client():
    with app.test_client() as test_client:
        with test_client.session_transaction() as sess:
            sess["username"] = "admin"
        yield test_client


@pytest.fixture
def anon_client():
    with app.test_client() as test_client:
        with test_client.session_transaction() as sess:
            sess.pop("username", None)
        yield test_client


def test_email_templates_requires_admin(anon_client):
    response = anon_client.get("/admin/email-templates")
    assert response.status_code == 302
    assert "/login" in response.headers.get("Location", "")


def test_email_templates_lists_default(client):
    response = client.get("/admin/email-templates")
    assert response.status_code == 200
    assert b"job-alert" in response.data


def test_email_templates_create_update_delete(client):
    # Create
    response = client.post(
        "/admin/email-templates",
        data={
            "action": "create",
            "name": "Daily Summary",
            "slug": "daily-summary",
            "subject": "Summary: {count_label}",
            "body": "Jobs:{jobs_section}",
            "is_active": "on",
        },
        follow_redirects=False,
    )
    assert response.status_code == 302
    templates = list_email_templates()
    assert any(t["slug"] == "daily-summary" for t in templates)

    # Update
    template_row = next(t for t in templates if t["slug"] == "daily-summary")
    response = client.post(
        "/admin/email-templates",
        data={
            "action": "update",
            "template_id": template_row["template_id"],
            "name": "Daily Summary",
            "slug": "daily-summary",
            "subject": "Updated: {count_label}",
            "body": "Updated body {jobs_section}",
        },
        follow_redirects=False,
    )
    assert response.status_code == 302
    updated = list_email_templates()
    updated_row = next(t for t in updated if t["slug"] == "daily-summary")
    assert "Updated:" in updated_row["subject"]

    # Delete
    response = client.post(
        "/admin/email-templates",
        data={
            "action": "delete",
            "template_id": updated_row["template_id"],
        },
        follow_redirects=False,
    )
    assert response.status_code == 302
    slugs = [t["slug"] for t in list_email_templates()]
    assert "daily-summary" not in slugs


def test_email_templates_preview(client):
    templates = list_email_templates()
    job_alert = next(t for t in templates if t["slug"] == "job-alert")
    response = client.get(f"/admin/email-templates?preview_id={job_alert['template_id']}")
    assert response.status_code == 200
    assert b"Preview" in response.data
    assert b"Subject" in response.data


def test_render_job_alert_email_uses_template_override(client):
    templates = list_email_templates()
    job_alert = next(t for t in templates if t["slug"] == "job-alert")
    update_email_template(
        job_alert["template_id"],
        subject="Custom Subject {count}",
        body="Body {jobs_message}",
    )
    rendered = render_job_alert_email([
        {
            "title": "Python Developer",
            "company": "Acme",
            "location": "Remote",
            "url": "https://example.com",
        }
    ])
    assert rendered["subject"].startswith("Custom Subject")
    assert "Python Developer" in rendered["body"]