from __future__ import annotations

import collections
import json
import os
import socket
import time
import uuid

import docker
import pytest
import requests
from docker import DockerClient
from docker.errors import APIError, NotFound
from requests import RequestException

CONSUL_VERSIONS = ["1.16.1", "1.17.3"]

ConsulInstance = collections.namedtuple("ConsulInstance", ["container", "port", "version"])

# Create a logs directory if it doesn't exist
LOGS_DIR = os.path.join(os.path.dirname(__file__), "logs")
os.makedirs(LOGS_DIR, exist_ok=True)


def get_free_ports(num: int, host=None) -> list[int]:
    if not host:
        host = "127.0.0.1"
    sockets = []
    ret = []
    for _ in range(num):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.bind((host, 0))
        ret.append(s.getsockname()[1])
        sockets.append(s)
    for s in sockets:
        s.close()
    return ret


@pytest.fixture(scope="session", autouse=True)
def _unset_consul_token():
    if "CONSUL_HTTP_TOKEN" in os.environ:
        del os.environ["CONSUL_HTTP_TOKEN"]


def start_consul_container(version: str, acl_master_token: str | None = None):
    """
    Starts a Consul container. If acl_master_token is None, ACL will be disabled
    for this server, otherwise it will be enabled and the master token will be
    set to the supplied token.

    Returns: a tuple of the container object and the HTTP port the instance is listening on
    """
    client = docker.from_env()
    allocated_ports = get_free_ports(5)
    ports = {
        "http": allocated_ports[0],
        "server": allocated_ports[1],
        "grpc": allocated_ports[2],
        "serf_lan": allocated_ports[3],
        "serf_wan": allocated_ports[4],
    }

    base_config = {
        "ports": {
            "https": -1,
            "dns": -1,
            "grpc_tls": -1,
        },
        "performance": {"raft_multiplier": 1},
        "enable_script_checks": True,
    }
    docker_config = {
        "ports": {
            8500: ports["http"],
            8300: ports["server"],
            8502: ports["grpc"],
            8301: ports["serf_lan"],
            8302: ports["serf_wan"],
        },
        "environment": {"CONSUL_LOCAL_CONFIG": json.dumps(base_config)},
        "detach": True,
        "name": f"consul_test_{uuid.uuid4().hex[:8]}",  # Add a unique name
    }

    # Extend the base config with required ACL fields if needed
    if acl_master_token:
        acl_config = {
            "primary_datacenter": "dc1",
            "acl": {"enabled": True, "tokens": {"initial_management": acl_master_token}},
        }
        merged_config = {**base_config, **acl_config}
        docker_config["environment"]["CONSUL_LOCAL_CONFIG"] = json.dumps(merged_config)  # type: ignore

    def start_consul_container_with_retry(  # pylint: disable=inconsistent-return-statements
        client: DockerClient,
        command: str,
        version: str,
        docker_config: dict,
        max_retries: int = 3,
        retry_delay: int = 2,
    ):
        """
        Start a Consul container with retries as a few initial attempts sometimes fail.
        """
        for attempt in range(max_retries):
            try:
                container = client.containers.run(f"hashicorp/consul:{version}", command=command, **docker_config)
                return container
            except APIError:
                # Cleanup that stray container as it might cause a naming conflict
                try:
                    container = client.containers.get(docker_config["name"])
                    container.remove(force=True)
                except NotFound:
                    pass
                if attempt == max_retries - 1:
                    raise
                time.sleep(retry_delay)

    container = start_consul_container_with_retry(
        client, command="agent -dev -client=0.0.0.0 -log-level trace", version=version, docker_config=docker_config
    )

    # Wait for Consul to be ready
    base_uri = f"http://127.0.0.1:{ports['http']}/v1/"
    start_time = time.time()
    global_timeout = 10

    while True:
        if time.time() - start_time > global_timeout:
            container.stop()
            container.remove()
            raise TimeoutError("Global timeout reached")
        time.sleep(0.1)
        try:
            response = requests.get(base_uri + "status/leader", timeout=2)
            if response.status_code == 200 and response.json():
                break
        except RequestException:
            continue

    # Additional check to ensure Consul is fully ready
    for _ in range(10):
        try:
            requests.put(base_uri + "agent/service/register", json={"name": "test-service"}, timeout=2)
            response = requests.get(base_uri + "health/service/test-service", timeout=2)
            if response.status_code == 200 and response.json():
                requests.put(base_uri + "agent/service/deregister/test-service", timeout=2)
                return container, ports["http"]
        except RequestException:
            time.sleep(0.5)

    container.stop()
    container.remove()
    raise Exception("Failed to verify Consul startup")  # pylint: disable=broad-exception-raised


def get_consul_version(port: int) -> str:
    base_uri = f"http://127.0.0.1:{port}/v1/"
    response = requests.get(base_uri + "agent/self", timeout=10)
    return response.json()["Config"]["Version"].strip()


def setup_and_teardown_consul(request, version, acl_master_token: str | None = None):
    # Start the container, yield, get container logs, store them in logs/<test_name>.log, stop the container
    container, port = start_consul_container(version=version, acl_master_token=acl_master_token)
    version = get_consul_version(port)
    instance = ConsulInstance(container, port, version)

    yield instance if acl_master_token is None else (instance, acl_master_token)

    logs = container.logs().decode("utf-8")
    log_file = os.path.join(LOGS_DIR, f"{request.node.name}.log")
    with open(log_file, "w", encoding="utf-8") as f:
        f.write(logs)

    container.stop()
    container.remove()


@pytest.fixture(params=CONSUL_VERSIONS)
def consul_instance(request):
    yield from setup_and_teardown_consul(request, version=request.param)


@pytest.fixture(params=CONSUL_VERSIONS)
def acl_consul_instance(request):
    acl_master_token = uuid.uuid4().hex
    yield from setup_and_teardown_consul(request, version=request.param, acl_master_token=acl_master_token)


@pytest.fixture
def consul_port(consul_instance):
    return consul_instance.port, consul_instance.version