import io
import pytest
from main import create_app
from config import Config


class TestConfig(Config):
    API_KEY = "test-key-123"
    DEBUG = True


@pytest.fixture
def app():
    app = create_app(TestConfig)
    app.config["TESTING"] = True
    return app


@pytest.fixture
def client(app):
    return app.test_client()


class TestHealthCheck:
    def test_health_no_auth_required(self, client):
        resp = client.get("/health")
        assert resp.status_code in (200, 503)
        data = resp.get_json()
        assert "status" in data
        assert "uptime_seconds" in data

    def test_health_returns_checks(self, client):
        resp = client.get("/health")
        data = resp.get_json()
        assert "checks" in data
        assert "upload_directory" in data["checks"]


class TestAuth:
    def test_no_api_key_returns_401(self, client):
        resp = client.post("/api/ocr")
        assert resp.status_code == 401

    def test_wrong_api_key_returns_401(self, client):
        resp = client.post("/api/ocr", headers={"X-API-Key": "wrong-key"})
        assert resp.status_code == 401

    def test_correct_api_key_passes_auth(self, client):
        # Will get 400 (no doc_type) but not 401
        resp = client.post("/api/ocr", headers={"X-API-Key": "test-key-123"})
        assert resp.status_code == 400


class TestOCREndpoint:
    def test_missing_doc_type_returns_400(self, client):
        resp = client.post(
            "/api/ocr",
            headers={"X-API-Key": "test-key-123"},
        )
        assert resp.status_code == 400
        assert "doc_type is required" in resp.get_json()["error"]

    def test_invalid_doc_type_returns_400(self, client):
        resp = client.post(
            "/api/ocr",
            headers={"X-API-Key": "test-key-123"},
            data={"doc_type": "invalid_type"},
        )
        assert resp.status_code == 400
        assert "Invalid doc_type" in resp.get_json()["error"]

    def test_no_file_returns_400(self, client):
        resp = client.post(
            "/api/ocr",
            headers={"X-API-Key": "test-key-123"},
            data={"doc_type": "sa_id_card"},
        )
        assert resp.status_code == 400
        assert "No front image" in resp.get_json()["error"]

    def test_invalid_file_type_returns_400(self, client):
        data = {
            "front": (io.BytesIO(b"not an image"), "test.txt"),
            "doc_type": "sa_id_card",
        }
        resp = client.post(
            "/api/ocr",
            headers={"X-API-Key": "test-key-123"},
            data=data,
            content_type="multipart/form-data",
        )
        assert resp.status_code == 400
        assert "Invalid file type" in resp.get_json()["error"]

    def test_back_rejected_for_non_id_card(self, client):
        data = {
            "front": (io.BytesIO(b"\x89PNG\r\n"), "front.png"),
            "back": (io.BytesIO(b"\x89PNG\r\n"), "back.png"),
            "doc_type": "sa_id_book",
        }
        resp = client.post(
            "/api/ocr",
            headers={"X-API-Key": "test-key-123"},
            data=data,
            content_type="multipart/form-data",
        )
        assert resp.status_code == 400
        assert "only accepted for doc_type=sa_id_card" in resp.get_json()["error"]

    def test_legacy_file_key_accepted(self, client):
        """Legacy 'file' key should work as front image."""
        data = {
            "file": (io.BytesIO(b"not an image"), "test.txt"),
            "doc_type": "sa_id_card",
        }
        resp = client.post(
            "/api/ocr",
            headers={"X-API-Key": "test-key-123"},
            data=data,
            content_type="multipart/form-data",
        )
        # 400 for invalid file type (not 400 for missing file)
        assert resp.status_code == 400
        assert "Invalid file type" in resp.get_json()["error"]

    def test_request_id_in_response(self, client):
        resp = client.post(
            "/api/ocr",
            headers={"X-API-Key": "test-key-123", "X-Request-ID": "test-req-123"},
            data={"doc_type": "sa_id_card"},
        )
        assert resp.headers.get("X-Request-ID") == "test-req-123"

    def test_request_id_generated_if_missing(self, client):
        resp = client.post(
            "/api/ocr",
            headers={"X-API-Key": "test-key-123"},
            data={"doc_type": "sa_id_card"},
        )
        assert resp.headers.get("X-Request-ID") is not None


class TestWarmEndpoint:
    def test_warm_no_auth_required(self, client):
        resp = client.get("/warm")
        assert resp.status_code == 200
        data = resp.get_json()
        assert "status" in data
        assert "engines" in data


class TestNotFound:
    def test_unknown_route_returns_404(self, client):
        resp = client.get("/api/unknown", headers={"X-API-Key": "test-key-123"})
        assert resp.status_code == 404
        data = resp.get_json()
        assert "error" in data