import json
import pytest
from backend.app import create_app

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

@pytest.fixture
def auth_headers(client):
    """
    Registers a test user and returns an authorization header.
    """
    import uuid
    unique_suffix = str(uuid.uuid4())[:8]
    username = f"activityuser_{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}"}

@pytest.fixture
def project_id(client, auth_headers):
    """
    Creates a project for the user so we can attach activity logs to it.
    Returns the project ID as a string.
    """
    payload = {
        "name": "Activity Test Project",
        "topic": "Log Testing",
        "description": "Project used for testing activity logs."
    }
    resp = client.post("/api/projects", data=json.dumps(payload),
                       content_type="application/json", headers=auth_headers)
    assert resp.status_code == 201, f"Project creation failed: {resp.data.decode()}"
    data = json.loads(resp.data)
    return data["project_id"]

def test_list_activity_empty(client, auth_headers, project_id):
    """
    No logs exist initially, so listing with ?projectId=xxx returns empty array.
    """
    url = f"/api/project_activity?projectId={project_id}"
    resp = client.get(url, headers=auth_headers)
    assert resp.status_code == 200, f"List logs failed: {resp.data.decode()}"
    data = json.loads(resp.data)
    assert "activity_logs" in data
    assert len(data["activity_logs"]) == 0

def test_create_activity(client, auth_headers, project_id):
    """
    Create an activity log for the project, then verify it appears in the listing.
    """
    payload = {
        "projectId": project_id,
        "activityType": "URL added",
        "message": "Added a new URL to the project."
    }
    create_resp = client.post("/api/project_activity",
                              data=json.dumps(payload),
                              content_type="application/json",
                              headers=auth_headers)
    assert create_resp.status_code == 201, f"Create activity failed: {create_resp.data.decode()}"
    create_data = json.loads(create_resp.data)
    assert "activity_id" in create_data

    # Now list logs
    list_resp = client.get(f"/api/project_activity?projectId={project_id}", headers=auth_headers)
    assert list_resp.status_code == 200
    list_data = json.loads(list_resp.data)
    logs = list_data.get("activity_logs", [])
    assert len(logs) == 1
    assert logs[0]["activityType"] == "URL added"
    assert logs[0]["message"] == "Added a new URL to the project."

def test_create_activity_invalid_project(client, auth_headers):
    """
    If projectId is invalid or not found, we expect 400 or 404.
    """
    # Invalid format
    payload1 = {
        "projectId": "not_a_valid_objectid",
        "activityType": "Test",
        "message": ""
    }
    resp1 = client.post("/api/project_activity",
                        data=json.dumps(payload1),
                        content_type="application/json",
                        headers=auth_headers)
    assert resp1.status_code == 400, f"Expected 400 for invalid projectId format, got {resp1.status_code}"

    # 404 if project doesn't exist
    payload2 = {
        "projectId": "64f3f000000000000000abcd",  # random objectId
        "activityType": "Test",
        "message": ""
    }
    resp2 = client.post("/api/project_activity",
                        data=json.dumps(payload2),
                        content_type="application/json",
                        headers=auth_headers)
    assert resp2.status_code == 404, f"Expected 404 for non-existent project, got {resp2.status_code}"

def test_list_activity_pagination(client, auth_headers, project_id):
    """
    Create multiple logs, then retrieve them with offset/limit.
    """
    # Create 5 logs
    for i in range(5):
        pay = {
            "projectId": project_id,
            "activityType": f"LogType{i}",
            "message": f"Message {i}"
        }
        resp = client.post("/api/project_activity",
                           data=json.dumps(pay),
                           content_type="application/json",
                           headers=auth_headers)
        assert resp.status_code == 201

    # List with limit=2, offset=0
    resp_list1 = client.get(f"/api/project_activity?projectId={project_id}&limit=2&offset=0", headers=auth_headers)
    assert resp_list1.status_code == 200
    data1 = json.loads(resp_list1.data)
    logs1 = data1["activity_logs"]
    assert len(logs1) == 2

    # List with limit=2, offset=2
    resp_list2 = client.get(f"/api/project_activity?projectId={project_id}&limit=2&offset=2", headers=auth_headers)
    data2 = json.loads(resp_list2.data)
    logs2 = data2["activity_logs"]
    assert len(logs2) == 2

def test_delete_activity(client, auth_headers, project_id):
    """
    By default, only the project owner can delete logs. We'll test that scenario.
    """
    # Create a log
    payload = {
        "projectId": project_id,
        "activityType": "DeleteCheck",
        "message": "Testing delete."
    }
    create_resp = client.post("/api/project_activity",
                              data=json.dumps(payload),
                              content_type="application/json",
                              headers=auth_headers)
    assert create_resp.status_code == 201
    activity_id = json.loads(create_resp.data)["activity_id"]

    # Delete it
    del_resp = client.delete(f"/api/project_activity/{activity_id}", headers=auth_headers)
    assert del_resp.status_code == 200, f"Delete log failed: {del_resp.data.decode()}"

    # Confirm it's gone
    list_resp = client.get(f"/api/project_activity?projectId={project_id}", headers=auth_headers)
    data = json.loads(list_resp.data)
    logs_left = [a for a in data["activity_logs"] if a["_id"] == activity_id]
    assert len(logs_left) == 0, "Activity log was not deleted properly."