import os
from typing import Any

from services.runner import run_cmd


def _top_dirs_cmd(path: str, limit: int) -> list[str]:
    return ["bash", "-lc", f"du -xhd1 {path} 2>/dev/null | sort -h | tail -n {limit}"]


async def build_disk_report(cfg: dict[str, Any], mount: str, usage: int) -> str:
    limit = int(cfg.get("disk_report", {}).get("top_dirs", 8))

    lines = ["🧱 Disk report", f"💽 {mount}: {usage}%"]

    rc, out = await run_cmd(_top_dirs_cmd(mount, limit), timeout=30)
    if rc == 0 and out.strip():
        lines.append("")
        lines.append("Top directories:")
        lines.append(out.strip())

    docker_dir = cfg.get("disk_report", {}).get("docker_dir", "/var/lib/docker")
    if docker_dir and os.path.exists(docker_dir):
        rc2, out2 = await run_cmd(_top_dirs_cmd(docker_dir, limit), timeout=30)
        if rc2 == 0 and out2.strip():
            lines.append("")
            lines.append(f"Docker dir: {docker_dir}")
            lines.append(out2.strip())

    logs_dir = cfg.get("disk_report", {}).get("logs_dir", "/var/log")
    if logs_dir and os.path.exists(logs_dir):
        rc3, out3 = await run_cmd(_top_dirs_cmd(logs_dir, limit), timeout=30)
        if rc3 == 0 and out3.strip():
            lines.append("")
            lines.append(f"Logs dir: {logs_dir}")
            lines.append(out3.strip())

    return "\n".join(lines)