"""Frontend integration tests — backend API calls are fully mocked."""
import os
import pytest
from unittest.mock import MagicMock, patch

os.environ.setdefault("FLASK_SECRET_KEY", "test-secret")
os.environ.setdefault("BACKEND_URL", "http://backend-mock")

from frontend.app.main import app  # noqa: E402


@pytest.fixture
def client():
    app.config["TESTING"] = True
    app.config["WTF_CSRF_ENABLED"] = False
    with app.test_client() as c:
        yield c


def _mock_response(status_code: int, json_data: dict) -> MagicMock:
    m = MagicMock()
    m.status_code = status_code
    m.json.return_value = json_data
    return m


# ---------------------------------------------------------------------------
# Index redirect
# ---------------------------------------------------------------------------

def test_index_redirects_to_login(client):
    resp = client.get("/")
    assert resp.status_code == 302
    assert "/login" in resp.headers["Location"]


def test_index_redirects_to_dashboard_when_logged_in(client):
    with client.session_transaction() as sess:
        sess["access_token"] = "tok"
        sess["refresh_token"] = "ref"
    resp = client.get("/")
    assert resp.status_code == 302
    assert "/dashboard" in resp.headers["Location"]


# ---------------------------------------------------------------------------
# Login
# ---------------------------------------------------------------------------

def test_login_page_renders(client):
    resp = client.get("/login")
    assert resp.status_code == 200
    assert b"Log in" in resp.data


def test_login_success(client):
    mock = _mock_response(200, {"access_token": "acc", "refresh_token": "ref"})
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.post("/login", data={"email": "u@example.com", "password": "secret"})
    assert resp.status_code == 302
    assert "/dashboard" in resp.headers["Location"]


def test_login_failure_shows_error(client):
    mock = _mock_response(401, {"detail": "Invalid credentials."})
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.post("/login", data={"email": "u@example.com", "password": "wrong"})
    assert resp.status_code == 200
    assert b"Invalid email or password" in resp.data


# ---------------------------------------------------------------------------
# Register
# ---------------------------------------------------------------------------

def test_register_page_renders(client):
    resp = client.get("/register")
    assert resp.status_code == 200
    assert b"Create account" in resp.data


def test_register_success_redirects_to_login(client):
    mock = _mock_response(201, {"id": "abc", "email": "u@example.com", "role": "user"})
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.post("/register", data={"email": "u@example.com", "password": "secret123"})
    assert resp.status_code == 302
    assert "/login" in resp.headers["Location"]


def test_register_duplicate_shows_error(client):
    mock = _mock_response(409, {"detail": "Email already registered."})
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.post("/register", data={"email": "dup@example.com", "password": "secret123"})
    assert resp.status_code == 200
    assert b"Email already registered" in resp.data


# ---------------------------------------------------------------------------
# Logout
# ---------------------------------------------------------------------------

def test_logout_clears_session_and_redirects(client):
    with client.session_transaction() as sess:
        sess["access_token"] = "tok"
        sess["refresh_token"] = "ref"
    mock = _mock_response(204, {})
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.get("/logout")
    assert resp.status_code == 302
    assert "/login" in resp.headers["Location"]
    with client.session_transaction() as sess:
        assert "access_token" not in sess


# ---------------------------------------------------------------------------
# Dashboard
# ---------------------------------------------------------------------------

def test_dashboard_requires_login(client):
    resp = client.get("/dashboard")
    assert resp.status_code == 302
    assert "/login" in resp.headers["Location"]


def test_dashboard_renders_user_info(client):
    with client.session_transaction() as sess:
        sess["access_token"] = "tok"
    mock = _mock_response(200, {"id": "1", "email": "u@example.com", "role": "user"})
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.get("/dashboard")
    assert resp.status_code == 200
    assert b"u@example.com" in resp.data


# ---------------------------------------------------------------------------
# Generate
# ---------------------------------------------------------------------------

def test_generate_page_requires_login(client):
    resp = client.get("/generate")
    assert resp.status_code == 302
    assert "/login" in resp.headers["Location"]


def test_generate_page_renders(client):
    with client.session_transaction() as sess:
        sess["access_token"] = "tok"
    resp = client.get("/generate")
    assert resp.status_code == 200
    assert b"Generate" in resp.data


def test_generate_text_success(client):
    with client.session_transaction() as sess:
        sess["access_token"] = "tok"
    mock = _mock_response(200, {"id": "g1", "model": "openai/gpt-4o", "content": "Hello world", "usage": None})
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.post("/generate", data={
            "type": "text", "model": "openai/gpt-4o", "prompt": "Say hello"
        })
    assert resp.status_code == 200
    assert b"Hello world" in resp.data


def test_generate_image_success(client):
    with client.session_transaction() as sess:
        sess["access_token"] = "tok"
    mock = _mock_response(200, {
        "id": "g2", "model": "openai/dall-e-3",
        "images": [{"url": "https://example.com/img.png", "revised_prompt": None, "b64_json": None}]
    })
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.post("/generate", data={
            "type": "image", "model": "openai/dall-e-3", "prompt": "A cat"
        })
    assert resp.status_code == 200
    assert b"example.com/img.png" in resp.data


def test_generate_upstream_error_shows_message(client):
    with client.session_transaction() as sess:
        sess["access_token"] = "tok"
    mock = _mock_response(502, {"detail": "OpenRouter error: timeout"})
    with patch("frontend.app.main.httpx.request", return_value=mock):
        resp = client.post("/generate", data={
            "type": "text", "model": "openai/gpt-4o", "prompt": "Hi"
        })
    assert resp.status_code == 200
    assert b"OpenRouter error" in resp.data