'use client';

import { Check, Copy, ExternalLink, X } from 'lucide-react';
import { useEffect, useState } from 'react';
import { ANIMATIONS, buildOverlayUrl, DEFAULT_OPTIONS, POSITIONS, SIZES, THEMES, type OverlayOptions } from '../lib/overlayOptions';

const STORAGE_KEY = 'ytchathub.overlay';

const LABELS: Record<string, string> = {
  bl: 'Bottom left', bc: 'Bottom center', br: 'Bottom right',
  tl: 'Top left', tc: 'Top center', tr: 'Top right',
  s: 'Small', m: 'Medium', l: 'Large', xl: 'Extra large',
  dark: 'Dark', light: 'Light', blueprint: 'Blueprint (light, brand)', glass: 'Glass', youtube: 'YouTube red',
  fade: 'Fade', slide: 'Slide', none: 'None'
};

function load(): OverlayOptions {
  try {
    const raw = localStorage.getItem(STORAGE_KEY);
    if (raw) return { ...DEFAULT_OPTIONS, ...JSON.parse(raw) };
  } catch {
    // storage unavailable or corrupt
  }
  return DEFAULT_OPTIONS;
}

export function OverlaySettings({ onClose }: { onClose: () => void }) {
  const [options, setOptions] = useState<OverlayOptions>(DEFAULT_OPTIONS);
  const [origin, setOrigin] = useState('');
  const [copied, setCopied] = useState(false);

  useEffect(() => {
    setOptions(load());
    setOrigin(window.location.origin);
  }, []);

  useEffect(() => {
    try {
      localStorage.setItem(STORAGE_KEY, JSON.stringify(options));
    } catch {
      // storage unavailable
    }
  }, [options]);

  const url = buildOverlayUrl(origin, options);
  const set = <K extends keyof OverlayOptions>(key: K, value: OverlayOptions[K]) => setOptions((prev) => ({ ...prev, [key]: value }));

  const copy = async () => {
    try {
      await navigator.clipboard.writeText(url);
      setCopied(true);
      setTimeout(() => setCopied(false), 1500);
    } catch {
      // clipboard blocked; the URL is still selectable in the field
    }
  };

  const select = <K extends 'theme' | 'pos' | 'size' | 'anim'>(key: K, label: string, values: readonly OverlayOptions[K][]) => (
    <label className="field">
      <span>{label}</span>
      <select value={options[key]} onChange={(event) => set(key, event.target.value as OverlayOptions[K])}>
        {values.map((value) => (
          <option key={value} value={value}>{LABELS[value] ?? value}</option>
        ))}
      </select>
    </label>
  );

  return (
    <div className="modal" onClick={onClose}>
      <div className="modal__card modal__card--wide" onClick={(event) => event.stopPropagation()}>
        <div className="modal__head">
          <h2>Overlay for OBS</h2>
          <button type="button" className="btn btn--icon" onClick={onClose} aria-label="Close">
            <X size={16} />
          </button>
        </div>
        <p className="muted">Add the URL below as a Browser Source. Settings are stored in the URL, so one source can have its own look.</p>
        <div className="fields">
          {select('theme', 'Theme', THEMES)}
          {select('pos', 'Position', POSITIONS)}
          {select('size', 'Text size', SIZES)}
          {select('anim', 'Animation', ANIMATIONS)}
          <label className="field">
            <span>Hide after (seconds, 0 = never)</span>
            <input type="number" min={0} max={600} value={options.hide} onChange={(event) => set('hide', Math.max(0, Number(event.target.value) || 0))} />
          </label>
          <label className="field">
            <span>Max width (px on a 1080p canvas, scales with source size)</span>
            <input type="number" min={240} max={1920} step={20} value={options.width} onChange={(event) => set('width', Math.max(240, Number(event.target.value) || 240))} />
          </label>
        </div>
        <div className="urlbox">
          <input readOnly value={url} onFocus={(event) => event.target.select()} />
          <button type="button" className="btn" onClick={copy}>
            {copied ? <Check size={14} /> : <Copy size={14} />}
            {copied ? 'Copied' : 'Copy'}
          </button>
          <a className="btn" href={url} target="_blank" rel="noopener noreferrer">
            <ExternalLink size={14} />
            Open
          </a>
        </div>
        <p className="muted">Recommended Browser Source size: 1920 × 1080, with “Shutdown source when not visible” off so the connection stays warm.</p>
      </div>
    </div>
  );
}