from types import SimpleNamespace

import pytest
from fastapi.testclient import TestClient

import app.main as main
from app import __version__


class DummySettings(SimpleNamespace):
    @property
    def auth_enabled(self):
        return bool(self.auth_token)


@pytest.fixture(autouse=True)
def reset_settings(monkeypatch):
    monkeypatch.setattr(
        main,
        "settings",
        DummySettings(
            env="test",
            docs_enabled=True,
            test_ui_enabled=True,
            auth_token="",
            auth_header_name="X-API-Key",
            max_upload_bytes=1024 * 1024,
            allowed_mime_types=("image/jpeg", "image/png", "image/webp", "image/gif"),
        ),
    )


@pytest.fixture()
def client():
    return TestClient(main.app)


def test_health_reflects_settings(client):
    resp = client.get("/health")
    assert resp.status_code == 200
    assert resp.json() == {
        "ok": True,
        "env": "test",
        "version": __version__,
        "docs_enabled": True,
        "test_ui_enabled": True,
        "auth_enabled": False,
        "auth_header": None,
        "max_upload_bytes": 1024 * 1024,
        "allowed_mime_types": ["image/jpeg", "image/png", "image/webp", "image/gif"],
    }


def test_index_shows_disabled_message_when_ui_off(monkeypatch):
    monkeypatch.setattr(
        main,
        "settings",
        DummySettings(
            env="test",
            docs_enabled=True,
            test_ui_enabled=False,
            auth_token="",
            auth_header_name="X-API-Key",
            max_upload_bytes=1024 * 1024,
            allowed_mime_types=("image/jpeg", "image/png", "image/webp", "image/gif"),
        ),
    )
    resp = TestClient(main.app).get("/")
    assert resp.status_code == 200
    assert "Test UI is disabled." in resp.text
    assert resp.headers["cache-control"] == "no-store"


def test_focus_accepts_bearer_auth_and_returns_payload(monkeypatch, client):
    monkeypatch.setattr(
        main,
        "settings",
        DummySettings(
            env="test",
            docs_enabled=True,
            test_ui_enabled=True,
            auth_token="secret",
            auth_header_name="X-API-Key",
            max_upload_bytes=1024 * 1024,
            allowed_mime_types=("image/jpeg", "image/png", "image/webp", "image/gif"),
        ),
    )

    def fake_process_image(image_bytes, filename, buffer_ratio=0.15, detector="subject"):
        assert image_bytes == b"image-bytes"
        assert filename == "sample.jpg"
        assert buffer_ratio == 0.2
        assert detector == "face"
        return {
            "filename": filename,
            "detector": detector,
            "method": "face_cascade",
            "buffer_ratio": buffer_ratio,
            "detected_bbox": {"x": 1, "y": 2, "w": 3, "h": 4},
            "square_bbox": {"x": 0, "y": 0, "w": 8, "h": 8},
            "source_size": {"width": 10, "height": 12},
            "crop_data_url": "data:image/jpeg;base64,AAA=",
            "annotated_data_url": "data:image/jpeg;base64,BBB=",
            "mime_type": "image/jpeg",
            "crop_bytes": b"crop",
        }

    monkeypatch.setattr("app.vision.process_image", fake_process_image)

    resp = client.post(
        "/api/focus",
        headers={"Authorization": "Bearer secret"},
        files={"file": ("sample.jpg", b"image-bytes", "image/jpeg")},
        data={"buffer_ratio": "0.2", "detector": "face"},
    )
    assert resp.status_code == 200
    assert resp.json()["method"] == "face_cascade"
    assert resp.json()["detected_bbox"] == {"x": 1, "y": 2, "w": 3, "h": 4}
    assert resp.json()["mime_type"] == "image/jpeg"


def test_focus_rejects_unauthorized_request(monkeypatch, client):
    monkeypatch.setattr(
        main,
        "settings",
        DummySettings(
            env="test",
            docs_enabled=True,
            test_ui_enabled=True,
            auth_token="secret",
            auth_header_name="X-API-Key",
            max_upload_bytes=1024 * 1024,
            allowed_mime_types=("image/jpeg", "image/png", "image/webp", "image/gif"),
        ),
    )

    resp = client.post(
        "/api/focus",
        files={"file": ("sample.jpg", b"image-bytes", "image/jpeg")},
    )
    assert resp.status_code == 401
    assert resp.json() == {"detail": "unauthorized"}


def test_focus_rejects_unsupported_content_type(monkeypatch, client):
    monkeypatch.setattr(
        main,
        "settings",
        DummySettings(
            env="test",
            docs_enabled=True,
            test_ui_enabled=True,
            auth_token="",
            auth_header_name="X-API-Key",
            max_upload_bytes=1024 * 1024,
            allowed_mime_types=("image/jpeg",),
        ),
    )

    resp = client.post(
        "/api/focus",
        files={"file": ("sample.txt", b"image-bytes", "text/plain")},
    )
    assert resp.status_code == 415
    assert resp.json() == {"detail": "unsupported content type: text/plain"}


def test_focus_rejects_large_upload(monkeypatch, client):
    monkeypatch.setattr(
        main,
        "settings",
        DummySettings(
            env="test",
            docs_enabled=True,
            test_ui_enabled=True,
            auth_token="",
            auth_header_name="X-API-Key",
            max_upload_bytes=4,
            allowed_mime_types=("image/jpeg",),
        ),
    )

    resp = client.post(
        "/api/focus",
        files={"file": ("sample.jpg", b"image-bytes", "image/jpeg")},
    )
    assert resp.status_code == 413
    assert resp.json() == {"detail": "upload exceeds FACE_LOCK_MAX_UPLOAD_BYTES (4 bytes)"}


def test_focus_image_returns_jpeg_stream(monkeypatch, client):
    def fake_process_image(image_bytes, filename, buffer_ratio=0.15, detector="subject"):
        return {
            "filename": filename,
            "detector": detector,
            "method": "subject_contour",
            "buffer_ratio": buffer_ratio,
            "detected_bbox": {"x": 1, "y": 2, "w": 3, "h": 4},
            "square_bbox": {"x": 0, "y": 0, "w": 8, "h": 8},
            "source_size": {"width": 10, "height": 12},
            "crop_data_url": "data:image/jpeg;base64,AAA=",
            "annotated_data_url": "data:image/jpeg;base64,BBB=",
            "mime_type": "image/jpeg",
            "crop_bytes": b"crop-bytes",
        }

    monkeypatch.setattr("app.vision.process_image", fake_process_image)

    resp = client.post(
        "/api/focus/image",
        files={"file": ("sample.jpg", b"image-bytes", "image/jpeg")},
    )
    assert resp.status_code == 200
    assert resp.headers["content-type"] == "image/jpeg"
    assert resp.headers["content-disposition"] == 'inline; filename="sample-crop.jpg"'
    assert resp.content == b"crop-bytes"