'use client';

import { useState } from 'react';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Eye, EyeOff, HardDrive, CheckCircle2, AlertCircle } from 'lucide-react';
import { saveHetznerConfig, configureHetznerCors } from '@/actions/settings';

interface HetznerConfig {
  hetzner_endpoint: string;
  hetzner_access_key: string;
  hetzner_secret_key: string;
  hetzner_bucket_name: string;
}

interface Props {
  initialConfig: HetznerConfig;
}

export function HetznerConfigForm({ initialConfig }: Props) {
  const [form, setForm] = useState<HetznerConfig>(initialConfig);
  const [showSecret, setShowSecret] = useState(false);
  const [loading, setLoading] = useState(false);
  const [status, setStatus] = useState<'idle' | 'success' | 'error'>('idle');
  const [errorMsg, setErrorMsg] = useState<string | null>(null);
  const [corsLoading, setCorsLoading] = useState(false);
  const [corsStatus, setCorsStatus] = useState<'idle' | 'success' | 'error'>('idle');
  const [corsError, setCorsError] = useState<string | null>(null);

  function handleChange(key: keyof HetznerConfig) {
    return (e: React.ChangeEvent<HTMLInputElement>) => {
      setForm((prev) => ({ ...prev, [key]: e.target.value }));
      setStatus('idle');
    };
  }

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setLoading(true);
    setStatus('idle');
    setErrorMsg(null);
    try {
      await saveHetznerConfig(form);
      setStatus('success');
    } catch (err: unknown) {
      setStatus('error');
      setErrorMsg(err instanceof Error ? err.message : 'Failed to save configuration.');
    } finally {
      setLoading(false);
    }
  }

  async function handleConfigureCors() {
    setCorsLoading(true);
    setCorsStatus('idle');
    setCorsError(null);
    try {
      await configureHetznerCors();
      setCorsStatus('success');
    } catch (err: unknown) {
      setCorsStatus('error');
      setCorsError(err instanceof Error ? err.message : 'Failed to configure CORS.');
    } finally {
      setCorsLoading(false);
    }
  }

  return (
    <Card>
      <CardHeader>
        <CardTitle className="text-base flex items-center gap-2">
          <HardDrive className="h-4 w-4" />
          Hetzner Object Storage
        </CardTitle>
        <CardDescription className="text-sm text-muted-foreground">
          Configure the Hetzner S3-compatible bucket used for high-res deliverable storage.
          These values override the environment variables and take effect immediately — no rebuild required.
        </CardDescription>
      </CardHeader>
      <CardContent>
        <form onSubmit={handleSubmit} className="space-y-4 max-w-sm">
          <div className="space-y-1.5">
            <Label htmlFor="hetzner_endpoint">Endpoint URL</Label>
            <Input
              id="hetzner_endpoint"
              type="url"
              placeholder="https://nbg1.your-objectstorage.com"
              value={form.hetzner_endpoint}
              onChange={handleChange('hetzner_endpoint')}
              autoComplete="off"
            />
          </div>

          <div className="space-y-1.5">
            <Label htmlFor="hetzner_bucket_name">Bucket Name</Label>
            <Input
              id="hetzner_bucket_name"
              type="text"
              placeholder="vfxreview"
              value={form.hetzner_bucket_name}
              onChange={handleChange('hetzner_bucket_name')}
              autoComplete="off"
            />
          </div>

          <div className="space-y-1.5">
            <Label htmlFor="hetzner_access_key">Access Key</Label>
            <Input
              id="hetzner_access_key"
              type="text"
              placeholder="Access key ID"
              value={form.hetzner_access_key}
              onChange={handleChange('hetzner_access_key')}
              autoComplete="off"
            />
          </div>

          <div className="space-y-1.5">
            <Label htmlFor="hetzner_secret_key">Secret Key</Label>
            <div className="relative">
              <Input
                id="hetzner_secret_key"
                type={showSecret ? 'text' : 'password'}
                placeholder="Secret key"
                value={form.hetzner_secret_key}
                onChange={handleChange('hetzner_secret_key')}
                autoComplete="new-password"
                className="pr-10"
              />
              <button
                type="button"
                onClick={() => setShowSecret((v) => !v)}
                className="absolute right-2.5 top-1/2 -translate-y-1/2 text-zinc-400 hover:text-white"
                tabIndex={-1}
              >
                {showSecret ? <EyeOff className="h-4 w-4" /> : <Eye className="h-4 w-4" />}
              </button>
            </div>
          </div>

          {status === 'success' && (
            <div className="flex items-center gap-2 text-sm text-emerald-400">
              <CheckCircle2 className="h-4 w-4 shrink-0" />
              Configuration saved — changes are live immediately.
            </div>
          )}

          {status === 'error' && (
            <div className="flex items-center gap-2 text-sm text-red-400">
              <AlertCircle className="h-4 w-4 shrink-0" />
              {errorMsg}
            </div>
          )}

          <Button type="submit" disabled={loading} size="sm">
            {loading ? 'Saving…' : 'Save Configuration'}
          </Button>
        </form>

        <div className="mt-6 border-t border-border pt-5 space-y-3">
          <div>
            <p className="text-sm font-medium">Batch Upload — CORS</p>
            <p className="text-xs text-muted-foreground mt-0.5">
              Required once so browsers can upload large MOV files directly to
              Hetzner, bypassing the Cloudflare / Nginx size limit.
            </p>
          </div>

          {corsStatus === 'success' && (
            <div className="flex items-center gap-2 text-sm text-emerald-400">
              <CheckCircle2 className="h-4 w-4 shrink-0" />
              CORS policy applied — batch MOV uploads should now work.
            </div>
          )}

          {corsStatus === 'error' && (
            <div className="flex items-center gap-2 text-sm text-red-400">
              <AlertCircle className="h-4 w-4 shrink-0" />
              {corsError}
            </div>
          )}

          <Button
            type="button"
            variant="outline"
            size="sm"
            disabled={corsLoading}
            onClick={handleConfigureCors}
          >
            {corsLoading ? 'Applying…' : 'Configure CORS on bucket'}
          </Button>
        </div>
      </CardContent>
    </Card>
  );
}