import { useState, useEffect, useRef } from "react";
import { api } from "../api";

const LOG_FILES = ["poller", "liquidsoap", "icecast_access", "icecast_error"];

export default function LogsPanel() {
  const [logFile, setLogFile] = useState("poller");
  const [lines, setLines] = useState([]);
  const [lineCount, setLineCount] = useState(100);
  const [autoRefresh, setAutoRefresh] = useState(false);
  const [exists, setExists] = useState(true);
  const bottomRef = useRef(null);

  const fetchLogs = () => {
    api.getLogs({ file: logFile, lines: lineCount })
      .then((data) => {
        setLines(data.lines);
        setExists(data.exists);
      })
      .catch(() => {});
  };

  useEffect(fetchLogs, [logFile, lineCount]);

  useEffect(() => {
    if (!autoRefresh) return;
    const id = setInterval(fetchLogs, 5000);
    return () => clearInterval(id);
  }, [autoRefresh, logFile, lineCount]);

  useEffect(() => {
    bottomRef.current?.scrollIntoView({ behavior: "smooth" });
  }, [lines]);

  return (
    <div>
      <div className="flex items-center justify-between mb-6 flex-wrap gap-3">
        <h1 className="text-2xl font-bold">Logs</h1>
        <div className="flex gap-3 items-center">
          <select
            value={logFile}
            onChange={(e) => setLogFile(e.target.value)}
            className="input text-sm"
          >
            {LOG_FILES.map((f) => (
              <option key={f} value={f}>{f}.log</option>
            ))}
          </select>

          <select
            value={lineCount}
            onChange={(e) => setLineCount(parseInt(e.target.value))}
            className="input text-sm"
          >
            <option value={50}>50 lines</option>
            <option value={100}>100 lines</option>
            <option value={200}>200 lines</option>
          </select>

          <label className="flex items-center gap-2 text-sm cursor-pointer">
            <input
              type="checkbox"
              checked={autoRefresh}
              onChange={(e) => setAutoRefresh(e.target.checked)}
              className="accent-radio-accent"
            />
            Auto-refresh
          </label>

          <button onClick={fetchLogs} className="btn btn-ghost text-sm">
            Refresh
          </button>
        </div>
      </div>

      <div className="card p-0">
        {!exists ? (
          <div className="p-8 text-center text-radio-muted">
            Log file <code>{logFile}.log</code> does not exist yet
          </div>
        ) : lines.length === 0 ? (
          <div className="p-8 text-center text-radio-muted">
            Log file is empty
          </div>
        ) : (
          <pre className="text-xs font-mono overflow-x-auto p-4 max-h-[70vh] overflow-y-auto leading-relaxed">
            {lines.map((line, i) => (
              <div
                key={i}
                className={`py-0.5 ${
                  line.includes("ERROR") || line.includes("error")
                    ? "text-radio-danger"
                    : line.includes("WARNING") || line.includes("warning")
                    ? "text-yellow-400"
                    : "text-radio-muted"
                }`}
              >
                {line}
              </div>
            ))}
            <div ref={bottomRef} />
          </pre>
        )}
      </div>
    </div>
  );
}