# -*- coding: utf-8 -*-
"""
Worker 配置模型

定义 Worker 运行时的配置参数。
"""

import os
from dataclasses import dataclass, field
from typing import List, Optional

from constant import HW_ACCEL_NONE, HW_ACCEL_QSV, HW_ACCEL_CUDA, HW_ACCEL_TYPES


# 默认支持的任务类型
DEFAULT_CAPABILITIES = [
    "RENDER_SEGMENT_VIDEO",
    "PREPARE_JOB_AUDIO",
    "PACKAGE_SEGMENT_TS",
    "FINALIZE_MP4"
]


@dataclass
class WorkerConfig:
    """
    Worker 配置

    包含 Worker 运行所需的所有配置参数。
    """
    # API 配置
    api_endpoint: str
    access_key: str
    worker_id: str

    # 并发控制
    max_concurrency: int = 4

    # 心跳配置
    heartbeat_interval: int = 5  # 秒

    # 租约配置
    lease_extension_threshold: int = 60  # 秒，提前多久续期
    lease_extension_duration: int = 300  # 秒，每次续期时长

    # 目录配置
    temp_dir: str = "/tmp/render_worker"

    # 能力配置
    capabilities: List[str] = field(default_factory=lambda: DEFAULT_CAPABILITIES.copy())

    # FFmpeg 配置
    ffmpeg_timeout: int = 3600  # 秒，FFmpeg 执行超时

    # 下载/上传配置
    download_timeout: int = 300  # 秒，下载超时
    upload_timeout: int = 600  # 秒，上传超时

    # 硬件加速配置
    hw_accel: str = HW_ACCEL_NONE  # 硬件加速类型: none, qsv, cuda

    @classmethod
    def from_env(cls) -> 'WorkerConfig':
        """从环境变量创建配置"""

        # API 端点，优先使用 V2 版本
        api_endpoint = os.getenv('API_ENDPOINT_V2') or os.getenv('API_ENDPOINT', '')
        if not api_endpoint:
            raise ValueError("API_ENDPOINT_V2 or API_ENDPOINT environment variable is required")

        # Access Key
        access_key = os.getenv('ACCESS_KEY', '')
        if not access_key:
            raise ValueError("ACCESS_KEY environment variable is required")

        # Worker ID
        worker_id = os.getenv('WORKER_ID', '100001')

        # 并发数
        max_concurrency = int(os.getenv('MAX_CONCURRENCY', '4'))

        # 心跳间隔
        heartbeat_interval = int(os.getenv('HEARTBEAT_INTERVAL', '5'))

        # 租约配置
        lease_extension_threshold = int(os.getenv('LEASE_EXTENSION_THRESHOLD', '60'))
        lease_extension_duration = int(os.getenv('LEASE_EXTENSION_DURATION', '300'))

        # 临时目录
        temp_dir = os.getenv('TEMP_DIR', os.getenv('TEMP', '/tmp/render_worker'))

        # 能力列表
        capabilities_str = os.getenv('CAPABILITIES', '')
        if capabilities_str:
            capabilities = [c.strip() for c in capabilities_str.split(',') if c.strip()]
        else:
            capabilities = DEFAULT_CAPABILITIES.copy()

        # FFmpeg 超时
        ffmpeg_timeout = int(os.getenv('FFMPEG_TIMEOUT', '3600'))

        # 下载/上传超时
        download_timeout = int(os.getenv('DOWNLOAD_TIMEOUT', '300'))
        upload_timeout = int(os.getenv('UPLOAD_TIMEOUT', '600'))

        # 硬件加速配置
        hw_accel = os.getenv('HW_ACCEL', HW_ACCEL_NONE).lower()
        if hw_accel not in HW_ACCEL_TYPES:
            hw_accel = HW_ACCEL_NONE

        return cls(
            api_endpoint=api_endpoint,
            access_key=access_key,
            worker_id=worker_id,
            max_concurrency=max_concurrency,
            heartbeat_interval=heartbeat_interval,
            lease_extension_threshold=lease_extension_threshold,
            lease_extension_duration=lease_extension_duration,
            temp_dir=temp_dir,
            capabilities=capabilities,
            ffmpeg_timeout=ffmpeg_timeout,
            download_timeout=download_timeout,
            upload_timeout=upload_timeout,
            hw_accel=hw_accel
        )

    def get_work_dir_path(self, task_id: str) -> str:
        """获取任务工作目录路径"""
        return os.path.join(self.temp_dir, f"task_{task_id}")

    def ensure_temp_dir(self) -> None:
        """确保临时目录存在"""
        os.makedirs(self.temp_dir, exist_ok=True)

    def is_hw_accel_enabled(self) -> bool:
        """是否启用了硬件加速"""
        return self.hw_accel != HW_ACCEL_NONE

    def is_qsv(self) -> bool:
        """是否使用 QSV 硬件加速"""
        return self.hw_accel == HW_ACCEL_QSV

    def is_cuda(self) -> bool:
        """是否使用 CUDA 硬件加速"""
        return self.hw_accel == HW_ACCEL_CUDA