"""
Tests fuer die Messenger API.

Testet:
- Kontakt CRUD Operationen
- Konversations-Management
- Nachrichten-Versand
- CSV Import/Export
- Vorlagen-Verwaltung
- Gruppen-Verwaltung
- Statistiken

Hinweis: Diese Tests nutzen den Docker-Container.
Starten Sie den Backend-Container vor dem Testen:
    docker compose up -d backend
"""

import pytest
import requests
import uuid
from typing import Optional

# Backend URL (Docker)
BASE_URL = "http://localhost:8000/api/messenger"


def skip_if_backend_unavailable():
    """Skip tests if backend is not running."""
    try:
        requests.get(f"{BASE_URL}/contacts", timeout=2)
    except requests.exceptions.RequestException:
        pytest.skip("Backend not available - start with 'docker compose up -d backend'")


def generate_unique_email():
    """Generiert eine eindeutige Email-Adresse fuer Tests."""
    return f"test_{uuid.uuid4().hex[:8]}@example.com"


class TestMessengerContacts:
    """Tests fuer Kontakt-Endpoints."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_get_contacts(self):
        """Test: Kontaktliste abrufen."""
        response = requests.get(f"{BASE_URL}/contacts")
        assert response.status_code == 200
        assert isinstance(response.json(), list)

    def test_create_and_delete_contact(self):
        """Test: Kontakt erstellen und loeschen."""
        contact_data = {
            "name": "Test Familie Mueller",
            "email": generate_unique_email(),
            "phone": "+49 123 456789",
            "student_name": "Max Mueller",
            "class_name": "10a"
        }

        # Erstellen
        response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        assert response.status_code == 200

        data = response.json()
        assert data["name"] == "Test Familie Mueller"
        assert "id" in data
        assert "created_at" in data
        assert "updated_at" in data

        # Loeschen
        contact_id = data["id"]
        delete_response = requests.delete(f"{BASE_URL}/contacts/{contact_id}")
        assert delete_response.status_code == 200
        assert delete_response.json()["status"] == "deleted"

    def test_update_contact(self):
        """Test: Kontakt aktualisieren."""
        # Erstellen
        contact_data = {"name": "Original Name", "email": generate_unique_email()}
        create_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = create_response.json()["id"]

        # Aktualisieren
        update_data = {"name": "Aktualisierter Name", "email": generate_unique_email()}
        response = requests.put(f"{BASE_URL}/contacts/{contact_id}", json=update_data)
        assert response.status_code == 200
        assert response.json()["name"] == "Aktualisierter Name"

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_get_single_contact(self):
        """Test: Einzelnen Kontakt abrufen."""
        # Erstellen
        contact_data = {"name": "Single Test", "email": generate_unique_email()}
        create_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = create_response.json()["id"]

        # Abrufen
        response = requests.get(f"{BASE_URL}/contacts/{contact_id}")
        assert response.status_code == 200
        assert response.json()["name"] == "Single Test"

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_get_nonexistent_contact(self):
        """Test: Nicht existierenden Kontakt abrufen gibt 404."""
        response = requests.get(f"{BASE_URL}/contacts/nonexistent-uuid")
        assert response.status_code == 404

    def test_filter_contacts_by_role(self):
        """Test: Kontakte nach Rolle filtern."""
        # Kontakt mit Rolle erstellen
        email = generate_unique_email()
        contact_data = {"name": "Teacher Test", "email": email, "role": "teacher"}
        create_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = create_response.json()["id"]

        # Nach Rolle filtern
        response = requests.get(f"{BASE_URL}/contacts", params={"role": "teacher"})
        assert response.status_code == 200
        contacts = response.json()
        assert all(c.get("role") == "teacher" for c in contacts)

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_filter_contacts_by_class(self):
        """Test: Kontakte nach Klasse filtern."""
        email = generate_unique_email()
        contact_data = {"name": "Class Test", "email": email, "class_name": "12b"}
        create_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = create_response.json()["id"]

        # Nach Klasse filtern
        response = requests.get(f"{BASE_URL}/contacts", params={"class_name": "12b"})
        assert response.status_code == 200
        contacts = response.json()
        assert all(c.get("class_name") == "12b" for c in contacts)

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_search_contacts(self):
        """Test: Kontakte durchsuchen."""
        unique_name = f"Suchtest_{uuid.uuid4().hex[:8]}"
        email = generate_unique_email()
        contact_data = {"name": unique_name, "email": email}
        create_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = create_response.json()["id"]

        # Suchen
        response = requests.get(f"{BASE_URL}/contacts", params={"search": unique_name})
        assert response.status_code == 200
        contacts = response.json()
        assert len(contacts) >= 1
        assert any(c["name"] == unique_name for c in contacts)

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_create_contact_with_tags(self):
        """Test: Kontakt mit Tags erstellen."""
        contact_data = {
            "name": "Tags Test",
            "email": generate_unique_email(),
            "tags": ["Elternbeirat", "Foerderverein"]
        }
        response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        assert response.status_code == 200
        assert "Elternbeirat" in response.json()["tags"]

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{response.json()['id']}")

    def test_duplicate_email_rejected(self):
        """Test: Doppelte Email-Adresse wird abgelehnt."""
        email = generate_unique_email()
        contact_data = {"name": "First Contact", "email": email}
        response1 = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        assert response1.status_code == 200
        contact_id = response1.json()["id"]

        # Zweiter Kontakt mit gleicher Email
        contact_data2 = {"name": "Second Contact", "email": email}
        response2 = requests.post(f"{BASE_URL}/contacts", json=contact_data2)
        assert response2.status_code == 400

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")


class TestMessengerConversations:
    """Tests fuer Konversations-Endpoints."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_get_conversations(self):
        """Test: Konversationsliste abrufen."""
        response = requests.get(f"{BASE_URL}/conversations")
        assert response.status_code == 200
        assert isinstance(response.json(), list)

    def test_create_conversation_with_contact(self):
        """Test: Konversation mit Kontakt erstellen."""
        # Kontakt erstellen
        contact_data = {"name": "Conv Test Contact", "email": generate_unique_email()}
        contact_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = contact_response.json()["id"]

        # Konversation erstellen
        response = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        assert response.status_code == 200
        conv = response.json()
        assert conv["name"] == "Conv Test Contact"
        assert contact_id in conv["participant_ids"]

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv['id']}")
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_create_conversation_returns_existing(self):
        """Test: Erneutes Erstellen gibt bestehende Konversation zurueck."""
        # Kontakt erstellen
        contact_data = {"name": "Existing Conv Test", "email": generate_unique_email()}
        contact_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = contact_response.json()["id"]

        # Erste Konversation
        response1 = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        conv_id1 = response1.json()["id"]

        # Zweite Anfrage sollte gleiche Konversation zurueckgeben
        response2 = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        conv_id2 = response2.json()["id"]

        assert conv_id1 == conv_id2

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv_id1}")
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_create_conversation_without_params_fails(self):
        """Test: Konversation ohne Parameter gibt Fehler."""
        response = requests.post(f"{BASE_URL}/conversations")
        assert response.status_code == 400

    def test_delete_conversation(self):
        """Test: Konversation loeschen."""
        # Kontakt und Konversation erstellen
        contact_data = {"name": "Delete Conv Test", "email": generate_unique_email()}
        contact_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = contact_response.json()["id"]

        conv_response = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        conv_id = conv_response.json()["id"]

        # Loeschen
        delete_response = requests.delete(f"{BASE_URL}/conversations/{conv_id}")
        assert delete_response.status_code == 200

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")


class TestMessengerMessages:
    """Tests fuer Nachrichten-Endpoints."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_send_and_get_messages(self):
        """Test: Nachricht senden und abrufen."""
        # Kontakt und Konversation erstellen
        contact_data = {"name": "Message Test", "email": generate_unique_email()}
        contact_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = contact_response.json()["id"]

        conv_response = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        conv_id = conv_response.json()["id"]

        # Nachricht senden
        msg_data = {"content": "Test Nachricht"}
        send_response = requests.post(f"{BASE_URL}/conversations/{conv_id}/messages", json=msg_data)
        assert send_response.status_code == 200
        msg = send_response.json()
        assert msg["content"] == "Test Nachricht"
        assert msg["sender_id"] == "self"

        # Nachrichten abrufen
        get_response = requests.get(f"{BASE_URL}/conversations/{conv_id}/messages")
        assert get_response.status_code == 200
        messages = get_response.json()
        assert len(messages) >= 1

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv_id}")
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_message_updates_conversation(self):
        """Test: Nachricht aktualisiert Konversation."""
        # Setup
        contact_data = {"name": "Update Conv Test", "email": generate_unique_email()}
        contact_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = contact_response.json()["id"]

        conv_response = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        conv_id = conv_response.json()["id"]

        # Nachricht senden
        msg_data = {"content": "Aktualisiert letzte Nachricht"}
        requests.post(f"{BASE_URL}/conversations/{conv_id}/messages", json=msg_data)

        # Konversation pruefen
        conv = requests.get(f"{BASE_URL}/conversations/{conv_id}").json()
        assert "Aktualisiert" in conv.get("last_message", "")

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv_id}")
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_mark_message_as_read(self):
        """Test: Nachricht als gelesen markieren."""
        # Setup
        contact_data = {"name": "Read Test", "email": generate_unique_email()}
        contact_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = contact_response.json()["id"]

        conv_response = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        conv_id = conv_response.json()["id"]

        msg_response = requests.post(
            f"{BASE_URL}/conversations/{conv_id}/messages",
            json={"content": "Read me"}
        )
        msg_id = msg_response.json()["id"]

        # Als gelesen markieren
        read_response = requests.put(f"{BASE_URL}/messages/{msg_id}/read")
        assert read_response.status_code == 200
        assert read_response.json()["status"] == "read"

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv_id}")
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_mark_all_messages_read(self):
        """Test: Alle Nachrichten einer Konversation als gelesen markieren."""
        # Setup
        contact_data = {"name": "Read All Test", "email": generate_unique_email()}
        contact_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = contact_response.json()["id"]

        conv_response = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        conv_id = conv_response.json()["id"]

        # Mehrere Nachrichten senden
        requests.post(f"{BASE_URL}/conversations/{conv_id}/messages", json={"content": "Msg 1"})
        requests.post(f"{BASE_URL}/conversations/{conv_id}/messages", json={"content": "Msg 2"})

        # Alle als gelesen markieren
        response = requests.put(f"{BASE_URL}/conversations/{conv_id}/read-all")
        assert response.status_code == 200
        assert response.json()["status"] == "all_read"

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv_id}")
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_messages_pagination(self):
        """Test: Nachrichten mit Limit abrufen."""
        # Setup
        contact_data = {"name": "Pagination Test", "email": generate_unique_email()}
        contact_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = contact_response.json()["id"]

        conv_response = requests.post(f"{BASE_URL}/conversations", params={"contact_id": contact_id})
        conv_id = conv_response.json()["id"]

        # Mehrere Nachrichten senden
        for i in range(5):
            requests.post(f"{BASE_URL}/conversations/{conv_id}/messages", json={"content": f"Msg {i}"})

        # Mit Limit abrufen
        response = requests.get(f"{BASE_URL}/conversations/{conv_id}/messages", params={"limit": 3})
        assert response.status_code == 200
        assert len(response.json()) <= 3

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv_id}")
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")


class TestMessengerTemplates:
    """Tests fuer Vorlagen-Endpoints."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_get_templates(self):
        """Test: Vorlagenliste abrufen."""
        response = requests.get(f"{BASE_URL}/templates")
        assert response.status_code == 200
        templates = response.json()
        assert isinstance(templates, list)
        # Standard-Vorlagen sollten vorhanden sein
        assert len(templates) >= 1

    def test_create_and_delete_template(self):
        """Test: Vorlage erstellen und loeschen."""
        # Erstellen (Query-Parameter)
        response = requests.post(
            f"{BASE_URL}/templates",
            params={
                "name": "Test Vorlage",
                "content": "Test mit [PLATZHALTER]",
                "category": "test"
            }
        )
        assert response.status_code == 200
        template = response.json()
        assert template["name"] == "Test Vorlage"
        assert "[PLATZHALTER]" in template["content"]

        # Loeschen
        delete_response = requests.delete(f"{BASE_URL}/templates/{template['id']}")
        assert delete_response.status_code == 200

    def test_default_templates_exist(self):
        """Test: Standard-Vorlagen sind vorhanden."""
        response = requests.get(f"{BASE_URL}/templates")
        templates = response.json()

        # Mindestens eine Vorlage sollte existieren
        assert len(templates) >= 1

        # Jede Vorlage hat die erforderlichen Felder
        for template in templates:
            assert "id" in template
            assert "name" in template
            assert "content" in template
            assert "category" in template


class TestMessengerGroups:
    """Tests fuer Gruppen-Endpoints."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_get_groups(self):
        """Test: Gruppenliste abrufen."""
        response = requests.get(f"{BASE_URL}/groups")
        assert response.status_code == 200
        assert isinstance(response.json(), list)

    def test_create_and_delete_group(self):
        """Test: Gruppe erstellen und loeschen."""
        group_data = {
            "name": f"Test Klasse {uuid.uuid4().hex[:4]}",
            "description": "Test Elterngruppe",
            "group_type": "class",
            "member_ids": []
        }

        # Erstellen
        response = requests.post(f"{BASE_URL}/groups", json=group_data)
        assert response.status_code == 200
        group = response.json()
        assert "Test Klasse" in group["name"]
        assert group["group_type"] == "class"

        # Loeschen
        delete_response = requests.delete(f"{BASE_URL}/groups/{group['id']}")
        assert delete_response.status_code == 200

    def test_update_group_members(self):
        """Test: Gruppen-Mitglieder aktualisieren."""
        # Kontakte erstellen
        contact1 = requests.post(
            f"{BASE_URL}/contacts",
            json={"name": "Member 1", "email": generate_unique_email()}
        ).json()
        contact2 = requests.post(
            f"{BASE_URL}/contacts",
            json={"name": "Member 2", "email": generate_unique_email()}
        ).json()

        # Gruppe erstellen
        group = requests.post(
            f"{BASE_URL}/groups",
            json={"name": "Members Test", "description": "Test", "member_ids": []}
        ).json()

        # Mitglieder hinzufuegen
        member_ids = [contact1["id"], contact2["id"]]
        response = requests.put(
            f"{BASE_URL}/groups/{group['id']}/members",
            json=member_ids
        )
        assert response.status_code == 200
        assert contact1["id"] in response.json()["member_ids"]
        assert contact2["id"] in response.json()["member_ids"]

        # Cleanup
        requests.delete(f"{BASE_URL}/groups/{group['id']}")
        requests.delete(f"{BASE_URL}/contacts/{contact1['id']}")
        requests.delete(f"{BASE_URL}/contacts/{contact2['id']}")

    def test_create_group_conversation(self):
        """Test: Gruppenkonversation erstellen."""
        # Gruppe erstellen
        group = requests.post(
            f"{BASE_URL}/groups",
            json={"name": "Group Conv Test", "description": "Test"}
        ).json()

        # Konversation mit Gruppe erstellen
        response = requests.post(
            f"{BASE_URL}/conversations",
            params={"group_id": group["id"]}
        )
        assert response.status_code == 200
        conv = response.json()
        assert conv["is_group"] == True
        assert conv["group_id"] == group["id"]

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv['id']}")
        requests.delete(f"{BASE_URL}/groups/{group['id']}")


class TestMessengerCSV:
    """Tests fuer CSV Import/Export."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_export_csv(self):
        """Test: Kontakte als CSV exportieren."""
        response = requests.get(f"{BASE_URL}/contacts/export/csv")
        assert response.status_code == 200
        assert "text/csv" in response.headers.get("content-type", "")

        # CSV-Inhalt pruefen
        content = response.text
        assert "name" in content.lower()
        assert "email" in content.lower()

    def test_import_csv_semicolon(self):
        """Test: Kontakte aus CSV mit Semikolon-Trennung importieren."""
        unique_email = generate_unique_email()
        csv_content = f"Name;Email;Telefon;Schueler;Klasse\nCSV Test Import;{unique_email};0123;CSV Schueler;5b"

        files = {"file": ("test.csv", csv_content, "text/csv")}
        response = requests.post(f"{BASE_URL}/contacts/import", files=files)

        assert response.status_code == 200
        result = response.json()
        assert "imported" in result
        assert result["imported"] >= 1

        # Cleanup - importierten Kontakt loeschen
        if result.get("contacts"):
            for contact in result["contacts"]:
                requests.delete(f"{BASE_URL}/contacts/{contact['id']}")

    def test_import_csv_german_columns(self):
        """Test: CSV mit deutschen Spaltennamen importieren."""
        unique_email = generate_unique_email()
        csv_content = f"Name;E-Mail;Telefon;Kind;Klasse;Notizen\nDeutsche Spalten;{unique_email};0123;Kind Name;7c;Test Notizen"

        files = {"file": ("german.csv", csv_content, "text/csv")}
        response = requests.post(f"{BASE_URL}/contacts/import", files=files)

        assert response.status_code == 200
        result = response.json()
        assert result["imported"] >= 1

        # Cleanup
        if result.get("contacts"):
            for contact in result["contacts"]:
                requests.delete(f"{BASE_URL}/contacts/{contact['id']}")

    def test_import_csv_skip_duplicates(self):
        """Test: CSV Import ueberspringt doppelte Emails."""
        # Ersten Kontakt erstellen
        email = generate_unique_email()
        requests.post(f"{BASE_URL}/contacts", json={"name": "Original", "email": email})

        # CSV mit gleicher Email importieren
        csv_content = f"Name;Email\nDuplikat;{email}"
        files = {"file": ("dup.csv", csv_content, "text/csv")}
        response = requests.post(f"{BASE_URL}/contacts/import", files=files)

        assert response.status_code == 200
        result = response.json()
        assert result["skipped"] >= 1
        assert any("existiert bereits" in err for err in result.get("errors", []))

    def test_import_csv_missing_name(self):
        """Test: CSV Import meldet fehlende Namen."""
        csv_content = "Name;Email\n;noname@test.com"
        files = {"file": ("noname.csv", csv_content, "text/csv")}
        response = requests.post(f"{BASE_URL}/contacts/import", files=files)

        assert response.status_code == 200
        result = response.json()
        assert result["skipped"] >= 1
        assert any("Name fehlt" in err for err in result.get("errors", []))

    def test_import_non_csv_rejected(self):
        """Test: Nicht-CSV Dateien werden abgelehnt."""
        files = {"file": ("test.txt", "not a csv", "text/plain")}
        response = requests.post(f"{BASE_URL}/contacts/import", files=files)
        assert response.status_code == 400


class TestMessengerStats:
    """Tests fuer Statistik-Endpoint."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_get_stats(self):
        """Test: Statistiken abrufen."""
        response = requests.get(f"{BASE_URL}/stats")
        assert response.status_code == 200

        stats = response.json()
        assert "total_contacts" in stats
        assert "total_groups" in stats
        assert "total_conversations" in stats
        assert "total_messages" in stats
        assert "unread_messages" in stats
        assert "contacts_by_role" in stats

    def test_stats_reflect_data(self):
        """Test: Statistiken spiegeln Daten wider."""
        # Initiale Stats
        initial_stats = requests.get(f"{BASE_URL}/stats").json()
        initial_contacts = initial_stats["total_contacts"]

        # Kontakt hinzufuegen
        contact = requests.post(
            f"{BASE_URL}/contacts",
            json={"name": "Stats Test", "email": generate_unique_email()}
        ).json()

        # Neue Stats
        new_stats = requests.get(f"{BASE_URL}/stats").json()
        assert new_stats["total_contacts"] == initial_contacts + 1

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact['id']}")


class TestMessengerEdgeCases:
    """Tests fuer Randfaelle und Fehlerbehandlung."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_update_nonexistent_contact(self):
        """Test: Update nicht existierendem Kontakt gibt 404."""
        response = requests.put(
            f"{BASE_URL}/contacts/nonexistent-uuid",
            json={"name": "Test"}
        )
        assert response.status_code == 404

    def test_message_to_nonexistent_conversation(self):
        """Test: Nachricht an nicht existierende Konversation gibt 404."""
        response = requests.post(
            f"{BASE_URL}/conversations/nonexistent-uuid/messages",
            json={"content": "Test"}
        )
        assert response.status_code == 404

    def test_create_conversation_nonexistent_contact(self):
        """Test: Konversation mit nicht existierendem Kontakt gibt 404."""
        response = requests.post(
            f"{BASE_URL}/conversations",
            params={"contact_id": "nonexistent-uuid"}
        )
        assert response.status_code == 404

    def test_create_conversation_nonexistent_group(self):
        """Test: Konversation mit nicht existierender Gruppe gibt 404."""
        response = requests.post(
            f"{BASE_URL}/conversations",
            params={"group_id": "nonexistent-uuid"}
        )
        assert response.status_code == 404

    def test_mark_nonexistent_message_read(self):
        """Test: Nicht existierende Nachricht als gelesen markieren gibt 404."""
        response = requests.put(f"{BASE_URL}/messages/nonexistent-uuid/read")
        assert response.status_code == 404

    def test_contact_without_email(self):
        """Test: Kontakt ohne Email erstellen ist erlaubt."""
        contact_data = {"name": "Nur Name"}
        response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        assert response.status_code == 200
        assert response.json()["email"] is None

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{response.json()['id']}")

    def test_empty_message_rejected(self):
        """Test: Leere Nachricht wird abgelehnt."""
        # Setup
        contact = requests.post(
            f"{BASE_URL}/contacts",
            json={"name": "Empty Msg Test", "email": generate_unique_email()}
        ).json()
        conv = requests.post(
            f"{BASE_URL}/conversations",
            params={"contact_id": contact["id"]}
        ).json()

        # Leere Nachricht sollte Fehler geben
        response = requests.post(
            f"{BASE_URL}/conversations/{conv['id']}/messages",
            json={"content": ""}
        )
        assert response.status_code == 422  # Validation error

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv['id']}")
        requests.delete(f"{BASE_URL}/contacts/{contact['id']}")


class TestMessengerMatrixFeatures:
    """Tests fuer Matrix-ID und bevorzugten Kanal."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_create_contact_with_matrix_id(self):
        """Test: Kontakt mit Matrix-ID erstellen."""
        contact_data = {
            "name": "Matrix User",
            "email": generate_unique_email(),
            "matrix_id": "@testuser:matrix.org"
        }
        response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        assert response.status_code == 200
        data = response.json()
        assert data["matrix_id"] == "@testuser:matrix.org"

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{data['id']}")

    def test_create_contact_with_preferred_channel(self):
        """Test: Kontakt mit bevorzugtem Kanal erstellen."""
        contact_data = {
            "name": "Channel Test",
            "email": generate_unique_email(),
            "preferred_channel": "matrix"
        }
        response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        assert response.status_code == 200
        data = response.json()
        assert data["preferred_channel"] == "matrix"

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{data['id']}")

    def test_update_contact_matrix_id(self):
        """Test: Matrix-ID eines Kontakts aktualisieren."""
        # Kontakt erstellen
        contact_data = {"name": "Update Matrix Test", "email": generate_unique_email()}
        create_response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        contact_id = create_response.json()["id"]

        # Matrix-ID hinzufuegen
        update_data = {"matrix_id": "@updated:matrix.org"}
        response = requests.put(f"{BASE_URL}/contacts/{contact_id}", json=update_data)
        assert response.status_code == 200
        assert response.json()["matrix_id"] == "@updated:matrix.org"

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact_id}")

    def test_default_preferred_channel_is_email(self):
        """Test: Standard bevorzugter Kanal ist 'email'."""
        contact_data = {"name": "Default Channel Test", "email": generate_unique_email()}
        response = requests.post(f"{BASE_URL}/contacts", json=contact_data)
        assert response.status_code == 200
        data = response.json()
        assert data["preferred_channel"] == "email"

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{data['id']}")

    def test_csv_export_includes_matrix_fields(self):
        """Test: CSV-Export enthaelt Matrix-ID und bevorzugten Kanal."""
        # Kontakt mit Matrix-Feldern erstellen
        contact_data = {
            "name": "CSV Matrix Test",
            "email": generate_unique_email(),
            "matrix_id": "@csvtest:matrix.org",
            "preferred_channel": "matrix"
        }
        contact = requests.post(f"{BASE_URL}/contacts", json=contact_data).json()

        # CSV exportieren
        response = requests.get(f"{BASE_URL}/contacts/export/csv")
        assert response.status_code == 200
        csv_content = response.text.lower()
        assert "matrix" in csv_content

        # Cleanup
        requests.delete(f"{BASE_URL}/contacts/{contact['id']}")


class TestMessengerEmailFeatures:
    """Tests fuer Email-Versand bei Nachrichten."""

    @pytest.fixture(autouse=True)
    def check_backend(self):
        skip_if_backend_unavailable()

    def test_send_message_with_email(self):
        """Test: Nachricht mit Email-Versand senden."""
        # Kontakt mit Email erstellen
        contact_data = {
            "name": "Email Test Contact",
            "email": generate_unique_email()
        }
        contact = requests.post(f"{BASE_URL}/contacts", json=contact_data).json()

        # Konversation erstellen
        conv = requests.post(
            f"{BASE_URL}/conversations",
            params={"contact_id": contact["id"]}
        ).json()

        # Nachricht mit send_email=true senden
        msg_data = {
            "content": "Diese Nachricht wird per Email gesendet.",
            "send_email": True
        }
        response = requests.post(
            f"{BASE_URL}/conversations/{conv['id']}/messages",
            json=msg_data
        )
        assert response.status_code == 200
        data = response.json()
        assert data["content"] == "Diese Nachricht wird per Email gesendet."
        # Email-Status wird zurueckgegeben
        assert "email_sent" in data

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv['id']}")
        requests.delete(f"{BASE_URL}/contacts/{contact['id']}")

    def test_send_message_without_email(self):
        """Test: Nachricht ohne Email-Versand senden."""
        # Kontakt erstellen
        contact = requests.post(
            f"{BASE_URL}/contacts",
            json={"name": "No Email Test", "email": generate_unique_email()}
        ).json()

        # Konversation erstellen
        conv = requests.post(
            f"{BASE_URL}/conversations",
            params={"contact_id": contact["id"]}
        ).json()

        # Nachricht ohne send_email senden (Standard: false)
        msg_data = {"content": "Normale Nachricht ohne Email."}
        response = requests.post(
            f"{BASE_URL}/conversations/{conv['id']}/messages",
            json=msg_data
        )
        assert response.status_code == 200
        data = response.json()
        # Email sollte nicht gesendet worden sein
        assert data.get("email_sent", False) == False

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv['id']}")
        requests.delete(f"{BASE_URL}/contacts/{contact['id']}")

    def test_send_message_email_to_contact_without_email_address(self):
        """Test: Email-Versand an Kontakt ohne Email-Adresse."""
        # Kontakt ohne Email erstellen
        contact = requests.post(
            f"{BASE_URL}/contacts",
            json={"name": "No Email Address"}
        ).json()

        # Konversation erstellen
        conv = requests.post(
            f"{BASE_URL}/conversations",
            params={"contact_id": contact["id"]}
        ).json()

        # Nachricht mit send_email=true senden
        msg_data = {
            "content": "Versuch Email zu senden ohne Adresse.",
            "send_email": True
        }
        response = requests.post(
            f"{BASE_URL}/conversations/{conv['id']}/messages",
            json=msg_data
        )
        assert response.status_code == 200
        # Nachricht sollte gespeichert werden, aber Email schlaegt fehl
        data = response.json()
        assert data["email_sent"] == False

        # Cleanup
        requests.delete(f"{BASE_URL}/conversations/{conv['id']}")
        requests.delete(f"{BASE_URL}/contacts/{contact['id']}")