import json
import pytest
from backend.app import create_app

@pytest.fixture
def client():
    """
    Creates a Flask test client from your create_app function.
    """
    app = create_app()
    app.config["TESTING"] = True
    with app.test_client() as client:
        yield client

@pytest.fixture
def auth_headers(client):
    """
    Registers and logs in a test user, returning an authorization header.
    """
    import uuid
    unique_suffix = str(uuid.uuid4())[:8]
    username = f"apilistuser_{unique_suffix}"
    email = f"{username}@example.com"

    reg_payload = {
        "username": username,
        "email": email,
        "password": "TestPassword123"
    }
    reg_resp = client.post("/api/register", data=json.dumps(reg_payload), content_type="application/json")
    assert reg_resp.status_code == 201, f"Registration failed: {reg_resp.data.decode()}"
    data = json.loads(reg_resp.data)
    token = data["token"]
    return {"Authorization": f"Bearer {token}"}

def test_list_api_keys_empty(client, auth_headers):
    """
    Initially, the user has no API keys.
    GET /api/api_list should return empty array.
    """
    resp = client.get("/api/api_list", headers=auth_headers)
    assert resp.status_code == 200, f"List keys failed: {resp.data.decode()}"
    data = json.loads(resp.data)
    assert "api_keys" in data
    assert len(data["api_keys"]) == 0

def test_create_api_key(client, auth_headers):
    """
    Test creating an API key for e.g. 'Gemini'.
    """
    payload = {
        "name": "Gemini",
        "key": "gemini-secret-key",
        "selected": True
    }
    create_resp = client.post("/api/api_list", data=json.dumps(payload),
                              content_type="application/json", headers=auth_headers)
    assert create_resp.status_code == 201, f"Create API key failed: {create_resp.data.decode()}"
    data = json.loads(create_resp.data)
    assert "api_id" in data

    # Now list and verify we see the new key
    list_resp = client.get("/api/api_list", headers=auth_headers)
    assert list_resp.status_code == 200
    list_data = json.loads(list_resp.data)
    keys = list_data.get("api_keys", [])
    assert len(keys) == 1
    api_entry = keys[0]
    assert api_entry["name"] == "Gemini"
    assert api_entry["key"] == "gemini-secret-key"
    assert api_entry["selected"] is True

def test_create_api_key_duplicate(client, auth_headers):
    """
    By default, the code returns 400 if the user already has an API key for the same 'name'.
    """
    # Create first
    payload1 = {
        "name": "Chatgpt",
        "key": "chatgpt-key1",
        "selected": False
    }
    resp1 = client.post("/api/api_list", data=json.dumps(payload1),
                        content_type="application/json", headers=auth_headers)
    assert resp1.status_code == 201

    # Try creating second with same 'name' => should fail with 400
    payload2 = {
        "name": "Chatgpt",
        "key": "chatgpt-key2",
        "selected": True
    }
    resp2 = client.post("/api/api_list", data=json.dumps(payload2),
                        content_type="application/json", headers=auth_headers)
    assert resp2.status_code == 400, f"Expected 400 on duplicate provider, got {resp2.status_code}"

def test_create_api_key_invalid_name(client, auth_headers):
    """
    If 'name' is not in ['Gemini','Deepseek','Chatgpt'], the code should fail with 400.
    """
    invalid_payload = {
        "name": "InvalidProvider",
        "key": "some-key",
        "selected": False
    }
    resp = client.post("/api/api_list", data=json.dumps(invalid_payload),
                       content_type="application/json", headers=auth_headers)
    assert resp.status_code == 400, f"Expected 400 on invalid 'name', got {resp.status_code}"

def test_update_api_key(client, auth_headers):
    """
    Test updating an existing API key fields: 'key', 'selected', or 'name'.
    """
    # Create
    payload = {
        "name": "Deepseek",
        "key": "deepseek-initial",
        "selected": False
    }
    create_resp = client.post("/api/api_list", data=json.dumps(payload),
                              content_type="application/json", headers=auth_headers)
    assert create_resp.status_code == 201
    api_id = json.loads(create_resp.data)["api_id"]

    # Now update
    update_payload = {"key": "deepseek-updated", "selected": True}
    update_resp = client.put(f"/api/api_list/{api_id}",
                             data=json.dumps(update_payload),
                             content_type="application/json", headers=auth_headers)
    assert update_resp.status_code == 200, f"Update failed: {update_resp.data.decode()}"

    # List and confirm
    list_resp = client.get("/api/api_list", headers=auth_headers)
    data = json.loads(list_resp.data)
    updated_entry = next((k for k in data["api_keys"] if k["_id"] == api_id), None)
    assert updated_entry is not None, "Updated key not found in list"
    assert updated_entry["key"] == "deepseek-updated"
    assert updated_entry["selected"] is True

def test_delete_api_key(client, auth_headers):
    """
    Test deleting an API key by _id.
    """
    payload = {
        "name": "Gemini",
        "key": "gemini-key2",
        "selected": False
    }
    create_resp = client.post("/api/api_list", data=json.dumps(payload),
                              content_type="application/json", headers=auth_headers)
    assert create_resp.status_code == 201
    api_id = json.loads(create_resp.data)["api_id"]

    # Delete
    delete_resp = client.delete(f"/api/api_list/{api_id}", headers=auth_headers)
    assert delete_resp.status_code == 200, f"Deletion failed: {delete_resp.data.decode()}"

    # Confirm it's gone
    list_resp = client.get("/api/api_list", headers=auth_headers)
    data = json.loads(list_resp.data)
    keys_left = [k for k in data["api_keys"] if k["_id"] == api_id]
    assert len(keys_left) == 0, "API key was not deleted properly"