#
#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
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#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
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#      http://www.apache.org/licenses/LICENSE-2.0
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#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
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import asyncio
import contextlib
import os
import time
from queue import Empty, Queue
from threading import Lock

from models.enums import SupportLanguage
from util import env_setting_enabled, is_valid_memory_limit
from utils.common import async_run_command

from core.logger import logger

_CONTAINER_QUEUES: dict[SupportLanguage, Queue] = {}
_CONTAINER_LOCK: Lock = Lock()


async def init_containers(size: int) -> tuple[int, int]:
    global _CONTAINER_QUEUES
    _CONTAINER_QUEUES = {SupportLanguage.PYTHON: Queue(), SupportLanguage.NODEJS: Queue()}

    with _CONTAINER_LOCK:
        while not _CONTAINER_QUEUES[SupportLanguage.PYTHON].empty():
            _CONTAINER_QUEUES[SupportLanguage.PYTHON].get_nowait()
        while not _CONTAINER_QUEUES[SupportLanguage.NODEJS].empty():
            _CONTAINER_QUEUES[SupportLanguage.NODEJS].get_nowait()

    create_tasks = []
    for i in range(size):
        name = f"sandbox_python_{i}"
        logger.info(f"🛠️ Creating Python container {i + 1}/{size}")
        create_tasks.append(_prepare_container(name, SupportLanguage.PYTHON))

        name = f"sandbox_nodejs_{i}"
        logger.info(f"🛠️ Creating Node.js container {i + 1}/{size}")
        create_tasks.append(_prepare_container(name, SupportLanguage.NODEJS))

    results = await asyncio.gather(*create_tasks, return_exceptions=True)
    success_count = sum(1 for r in results if r is True)
    total_task_count = len(create_tasks)
    return success_count, total_task_count


async def teardown_containers():
    with _CONTAINER_LOCK:
        while not _CONTAINER_QUEUES[SupportLanguage.PYTHON].empty():
            name = _CONTAINER_QUEUES[SupportLanguage.PYTHON].get_nowait()
            await async_run_command("docker", "rm", "-f", name, timeout=5)
        while not _CONTAINER_QUEUES[SupportLanguage.NODEJS].empty():
            name = _CONTAINER_QUEUES[SupportLanguage.NODEJS].get_nowait()
            await async_run_command("docker", "rm", "-f", name, timeout=5)


async def _prepare_container(name: str, language: SupportLanguage) -> bool:
    """Prepare a single container"""
    with contextlib.suppress(Exception):
        await async_run_command("docker", "rm", "-f", name, timeout=5)

    if await create_container(name, language):
        _CONTAINER_QUEUES[language].put(name)
        return True
    return False


async def create_container(name: str, language: SupportLanguage) -> bool:
    """Asynchronously create a container"""
    create_args = [
        "docker",
        "run",
        "-d",
        "--runtime=runsc",
        "--name",
        name,
        "--read-only",
        "--tmpfs",
        "/workspace:rw,exec,size=100M,uid=65534,gid=65534",
        "--tmpfs",
        "/tmp:rw,exec,size=50M",
        "--user",
        "nobody",
        "--workdir",
        "/workspace",
    ]
    if os.getenv("SANDBOX_MAX_MEMORY"):
        memory_limit = os.getenv("SANDBOX_MAX_MEMORY") or "256m"
        if is_valid_memory_limit(memory_limit):
            logger.info(f"SANDBOX_MAX_MEMORY: {os.getenv('SANDBOX_MAX_MEMORY')}")
        else:
            logger.info("Invalid SANDBOX_MAX_MEMORY, using default value: 256m")
            memory_limit = "256m"
        create_args.extend(["--memory", memory_limit])
    else:
        logger.info("Set default SANDBOX_MAX_MEMORY: 256m")
        create_args.extend(["--memory", "256m"])

    if env_setting_enabled("SANDBOX_ENABLE_SECCOMP", "false"):
        logger.info(f"SANDBOX_ENABLE_SECCOMP: {os.getenv('SANDBOX_ENABLE_SECCOMP')}")
        create_args.extend(["--security-opt", "seccomp=/app/seccomp-profile-default.json"])

    if language == SupportLanguage.PYTHON:
        create_args.append(os.getenv("SANDBOX_BASE_PYTHON_IMAGE", "sandbox-base-python:latest"))
    elif language == SupportLanguage.NODEJS:
        create_args.append(os.getenv("SANDBOX_BASE_NODEJS_IMAGE", "sandbox-base-nodejs:latest"))

    logger.info(f"Sandbox config:\n\t {create_args}")

    try:
        returncode, _, stderr = await async_run_command(*create_args, timeout=10)
        if returncode != 0:
            logger.error(f"❌ Container creation failed {name}: {stderr}")
            return False

        if language == SupportLanguage.NODEJS:
            copy_cmd = ["docker", "exec", name, "bash", "-c", "cp -a /app/node_modules /workspace/"]
            returncode, _, stderr = await async_run_command(*copy_cmd, timeout=10)
            if returncode != 0:
                logger.error(f"❌ Failed to prepare dependencies for {name}: {stderr}")
                return False

        return await container_is_running(name)
    except Exception as e:
        logger.error(f"❌ Container creation exception {name}: {str(e)}")
        return False


async def recreate_container(name: str, language: SupportLanguage) -> bool:
    """Asynchronously recreate a container"""
    logger.info(f"🛠️ Recreating container: {name}")
    try:
        await async_run_command("docker", "rm", "-f", name, timeout=5)

        return await create_container(name, language)
    except Exception as e:
        logger.error(f"❌ Container {name} recreation failed: {str(e)}")
        return False


async def release_container(name: str, language: SupportLanguage):
    """Asynchronously release a container"""
    with _CONTAINER_LOCK:
        if await container_is_running(name):
            _CONTAINER_QUEUES[language].put(name)
            logger.info(f"🟢 Released container: {name} (remaining available: {_CONTAINER_QUEUES[language].qsize()})")
        else:
            logger.warning(f"⚠️ Container {name} has crashed, attempting to recreate...")
            if await recreate_container(name, language):
                _CONTAINER_QUEUES[language].put(name)
                logger.info(f"✅ Container {name} successfully recreated and returned to queue")


async def allocate_container_blocking(language: SupportLanguage, timeout=10) -> str:
    """Asynchronously allocate an available container"""
    start_time = time.time()
    while time.time() - start_time < timeout:
        try:
            name = _CONTAINER_QUEUES[language].get_nowait()

            with _CONTAINER_LOCK:
                if not await container_is_running(name) and not await recreate_container(name, language):
                    continue

                return name
        except Empty:
            await asyncio.sleep(0.1)

    return ""


async def container_is_running(name: str) -> bool:
    """Asynchronously check the container status"""
    try:
        returncode, stdout, _ = await async_run_command("docker", "inspect", "-f", "{{.State.Running}}", name, timeout=2)
        return returncode == 0 and stdout.strip() == "true"
    except Exception:
        return False