"""
将主机端 GPKG 和模板文件预拷贝到 Docker 容器本地文件系统。

WSL2 9P 文件系统随机读取极慢（GPKG 62MB 耗时 6-10s，模板 ZIP 也慢），
拷贝到容器内 /data/ 后读取仅需 ~0.5s。

用法：
  python app/script/copy_data_to_container.py [--container qgis-server] [--dry-run] [--only gpkg|template]

前置条件：
  Docker 容器已启动（docker start qgis-server）
"""
import argparse
import os
import subprocess
import sys
import time
from pathlib import Path

PROJECT_ROOT = Path(__file__).resolve().parent.parent.parent


def _load_config():
    """从 settings.toml 读取配置"""
    try:
        from config import settings
        return {
            "gpkg_subdir": getattr(settings, "QGIS_GPKG_DIR", "app/data/gpkg"),
            "template_subdir": "app/data/template",
            "container": getattr(settings, "QGIS_DOCKER_CONTAINER", "qgis-server"),
            "container_gpkg": getattr(settings, "QGIS_DOCKER_GPKG_DIR", "/data/gpkg"),
            "container_template": getattr(settings, "QGIS_DOCKER_TEMPLATE_DIR", "/data/template"),
        }
    except ImportError:
        pass

    # fallback: 解析 TOML
    cfg = {
        "gpkg_subdir": "app/data/gpkg",
        "template_subdir": "app/data/template",
        "container": "qgis-server",
        "container_gpkg": "/data/gpkg",
        "container_template": "/data/template",
    }
    toml_path = PROJECT_ROOT / "settings.toml"
    if toml_path.exists():
        for line in toml_path.read_text(encoding="utf-8").splitlines():
            line = line.strip()
            for key, prefix in [
                ("gpkg_subdir", "QGIS_GPKG_DIR"),
                ("container", "QGIS_DOCKER_CONTAINER"),
                ("container_gpkg", "QGIS_DOCKER_GPKG_DIR"),
                ("container_template", "QGIS_DOCKER_TEMPLATE_DIR"),
            ]:
                if line.startswith(prefix) and "=" in line:
                    cfg[key] = line.split("=", 1)[1].strip().strip('"').strip("'")
    return cfg


def _run(cmd, timeout=10, **kwargs):
    """subprocess.run 封装，统一 UTF-8 编码，避免 Windows GBK 报错"""
    result = subprocess.run(
        cmd, capture_output=True, timeout=timeout,
        encoding="utf-8", errors="replace", **kwargs,
    )
    return result


def _check_container(container: str):
    """检查容器是否运行"""
    result = _run(["docker", "inspect", "--format={{.State.Running}}", container], timeout=5)
    if (result.stdout or "").strip() != "true":
        raise RuntimeError(f"容器 {container} 未运行，请先 docker start {container}")


def _copy_dir_to_container(host_dir: Path, container: str, container_dest: str, label: str, dry_run: bool):
    """拷贝单个目录到容器"""
    if not host_dir.is_dir():
        print(f"  [{label}] 目录不存在，跳过: {host_dir}")
        return 0

    files = list(host_dir.rglob("*"))
    files = [f for f in files if f.is_file()]
    if not files:
        print(f"  [{label}] 目录为空，跳过: {host_dir}")
        return 0

    total_size = sum(f.stat().st_size for f in files)
    print(f"  [{label}] 主机目录: {host_dir}")
    print(f"           文件数: {len(files)}, 总大小: {total_size / 1024 / 1024:.1f} MB")
    print(f"           容器目标: {container}:{container_dest}")

    if dry_run:
        print(f"           [dry-run] 跳过")
        return 0

    # 确保目标目录存在
    parent_dir = container_dest.rsplit("/", 1)[0]
    _run(["docker", "exec", container, "mkdir", "-p", parent_dir])

    # 清理旧目录
    _run(["docker", "exec", container, "rm", "-rf", container_dest])

    # docker cp
    t0 = time.time()
    result = _run(["docker", "cp", str(host_dir), f"{container}:{container_dest}"], timeout=120)
    elapsed = time.time() - t0

    if result.returncode != 0:
        raise RuntimeError(f"[{label}] docker cp 失败: {result.stderr}")

    # 验证
    verify = _run(["docker", "exec", container, "find", container_dest, "-type", "f"])
    stdout = (verify.stdout or "").strip()
    count = len([l for l in stdout.splitlines() if l.strip()])
    print(f"           拷贝完成: {elapsed:.1f}s, 容器内 {count} 个文件")
    return elapsed


def copy_to_container(container: str = None, dry_run: bool = False, only: str = None):
    """将 GPKG 和模板拷贝到容器本地文件系统"""
    cfg = _load_config()
    if container is None:
        container = cfg["container"]

    _check_container(container)

    t_total = time.time()
    print(f"=== 预拷贝静态数据到容器 {container} ===\n")

    if only != "template":
        host_gpkg = PROJECT_ROOT / cfg["gpkg_subdir"]
        _copy_dir_to_container(host_gpkg, container, cfg["container_gpkg"], "GPKG", dry_run)
        print()

    if only != "gpkg":
        host_template = PROJECT_ROOT / cfg["template_subdir"]
        _copy_dir_to_container(host_template, container, cfg["container_template"], "模板", dry_run)

    elapsed = time.time() - t_total
    print(f"\n=== 总耗时: {elapsed:.1f}s ===")


def main():
    parser = argparse.ArgumentParser(description="将 GPKG 和模板预拷贝到 Docker 容器本地 FS")
    parser.add_argument("--container", default=None, help="Docker 容器名称")
    parser.add_argument("--dry-run", action="store_true", help="仅显示信息，不实际拷贝")
    parser.add_argument("--only", choices=["gpkg", "template"], help="只拷贝指定类型")
    args = parser.parse_args()

    try:
        copy_to_container(container=args.container, dry_run=args.dry_run, only=args.only)
    except Exception as e:
        print(f"错误: {e}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()