import { useEffect, useState } from 'react';
import { supabase } from '@/integrations/supabase/client';
import { Card, CardContent, CardHeader, CardTitle, CardDescription } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { Label } from '@/components/ui/label';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
import { Alert, AlertDescription } from '@/components/ui/alert';
import { Switch } from '@/components/ui/switch';
import { toast } from '@/hooks/use-toast';
import { Puzzle, Webhook, MessageSquare, Calendar, Mail, Link as LinkIcon, Key, Send, AlertTriangle } from 'lucide-react';

interface IntegrationSettings {
  id?: string;
  integration_n8n_base_url: string;
  integration_whatsapp_number: string;
  integration_whatsapp_url: string;
  integration_google_calendar_id: string;
  google_oauth_config?: string;
  integration_email_provider: string;
  integration_email_api_base_url: string;
  integration_email_api_token: string;
  integration_email_from_name: string;
  integration_email_from_email: string;
  integration_privacy_url: string;
  integration_terms_url: string;
  integration_n8n_test_mode: boolean;
}

const emptySettings: IntegrationSettings = {
  integration_n8n_base_url: '',
  integration_whatsapp_number: '',
  integration_whatsapp_url: '',
  integration_google_calendar_id: '',
  integration_email_provider: 'mailketing',
  integration_email_api_base_url: '',
  integration_email_api_token: '',
  integration_email_from_name: '',
  integration_email_from_email: '',
  integration_privacy_url: '/privacy',
  integration_terms_url: '/terms',
  integration_n8n_test_mode: false,
};

export function IntegrasiTab() {
  const [settings, setSettings] = useState<IntegrationSettings>(emptySettings);
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [testEmail, setTestEmail] = useState('');
  const [sendingTest, setSendingTest] = useState(false);
  const [isTestRunning, setIsTestRunning] = useState(false);

  useEffect(() => {
    fetchSettings();
  }, []);

  const fetchSettings = async () => {
    const { data: platformData } = await supabase
      .from('platform_settings')
      .select('*')
      .single();

    if (platformData) {
      setSettings({
        id: platformData.id,
        integration_n8n_base_url: platformData.integration_n8n_base_url || '',
        integration_whatsapp_number: platformData.integration_whatsapp_number || '',
        integration_whatsapp_url: platformData.integration_whatsapp_url || '',
        integration_google_calendar_id: platformData.integration_google_calendar_id || '',
        google_oauth_config: platformData.google_oauth_config || '',
        integration_email_provider: platformData.integration_email_provider || 'mailketing',
        integration_email_api_base_url: platformData.integration_email_api_base_url || '',
        integration_email_api_token: platformData.integration_email_api_token || '',
        integration_email_from_name: platformData.integration_email_from_name || platformData.brand_email_from_name || '',
        integration_email_from_email: platformData.integration_email_from_email || '',
        integration_privacy_url: platformData.integration_privacy_url || '/privacy',
        integration_terms_url: platformData.integration_terms_url || '/terms',
        integration_n8n_test_mode: platformData.integration_n8n_test_mode || false,
      });
    }
    setLoading(false);
  };

  const saveSettings = async () => {
    setSaving(true);

    try {
      // Save platform settings (includes email settings)
      const platformPayload = {
        integration_n8n_base_url: settings.integration_n8n_base_url,
        integration_whatsapp_number: settings.integration_whatsapp_number,
        integration_whatsapp_url: settings.integration_whatsapp_url,
        integration_google_calendar_id: settings.integration_google_calendar_id,
        google_oauth_config: settings.google_oauth_config,
        integration_email_provider: settings.integration_email_provider,
        integration_email_api_base_url: settings.integration_email_api_base_url,
        integration_email_api_token: settings.integration_email_api_token,
        integration_email_from_name: settings.integration_email_from_name,
        integration_email_from_email: settings.integration_email_from_email,
        integration_privacy_url: settings.integration_privacy_url,
        integration_terms_url: settings.integration_terms_url,
        integration_n8n_test_mode: settings.integration_n8n_test_mode,
      };

      if (settings.id) {
        const { error: platformError } = await supabase
          .from('platform_settings')
          .update(platformPayload)
          .eq('id', settings.id);

        if (platformError) {
          // If schema cache error, try saving OAuth config separately via raw SQL
          if (platformError.code === 'PGRST204' && settings.google_oauth_config) {
            console.log('Schema cache error, using fallback RPC method');
            const { error: rpcError } = await supabase.rpc('exec_sql', {
              sql: `UPDATE platform_settings SET google_oauth_config = '${settings.google_oauth_config.replace(/'/g, "''")}'::jsonb WHERE id = '${settings.id}'`
            });

            if (rpcError) {
              // Save other fields without the problematic column
              const { error: retryError } = await supabase
                .from('platform_settings')
                .update({
                  integration_n8n_base_url: settings.integration_n8n_base_url,
                  integration_whatsapp_number: settings.integration_whatsapp_number,
                  integration_whatsapp_url: settings.integration_whatsapp_url,
                  integration_google_calendar_id: settings.integration_google_calendar_id,
                  integration_email_provider: settings.integration_email_provider,
                  integration_email_api_base_url: settings.integration_email_api_base_url,
                  integration_email_api_token: settings.integration_email_api_token,
                  integration_email_from_name: settings.integration_email_from_name,
                  integration_email_from_email: settings.integration_email_from_email,
                  integration_privacy_url: settings.integration_privacy_url,
                  integration_terms_url: settings.integration_terms_url,
                  integration_n8n_test_mode: settings.integration_n8n_test_mode,
                })
                .eq('id', settings.id);

              if (retryError) throw retryError;
              toast({ title: 'Peringatan', description: 'Pengaturan disimpan tapi Service Account JSON perlu disimpan manual. Hubungi admin.' });
            } else {
              toast({ title: 'Berhasil', description: 'Service Account JSON disimpan via RPC' });
            }
          } else {
            throw platformError;
          }
        }
      }

      toast({ title: 'Berhasil', description: 'Pengaturan integrasi disimpan' });
    } catch (error: any) {
      toast({ title: 'Error', description: error.message, variant: 'destructive' });
    }

    setSaving(false);
  };

  const sendTestEmail = async () => {
    if (!testEmail) return toast({ title: 'Error', description: 'Masukkan email tujuan', variant: 'destructive' });
    if (!isEmailConfigured) return toast({ title: 'Error', description: 'Lengkapi konfigurasi email provider terlebih dahulu', variant: 'destructive' });

    setSendingTest(true);
    try {
      // Get brand name for test email
      const { data: platformData } = await supabase
        .from('platform_settings')
        .select('brand_name')
        .single();

      const brandName = platformData?.brand_name || 'ACCESS HUB';

      // Test email content using proper HTML template
      const testEmailContent = `
<div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto; padding: 20px;">
  <h2 style="color: #333;">Email Test - ${brandName}</h2>

  <p>Halo,</p>

  <p>Ini adalah email tes dari sistem <strong>${brandName}</strong>.</p>

  <div style="margin: 20px 0; padding: 15px; background-color: #f0f0f0; border-left: 4px solid #000;">
    <p style="margin: 0; font-size: 14px;">
      <strong>✓ Konfigurasi email berhasil!</strong><br>
      Email Anda telah terkirim dengan benar menggunakan provider: <strong>Mailketing</strong>
    </p>
  </div>

  <p style="font-size: 14px; color: #666;">
    Jika Anda menerima email ini, berarti konfigurasi email sudah benar.
  </p>

  <p style="font-size: 14px;">
    Terima kasih,<br>
    Tim ${brandName}
  </p>
</div>
      `;

      const { data, error } = await supabase.functions.invoke('send-notification', {
        body: {
          template_key: 'test_email',
          recipient_email: testEmail,
          recipient_name: 'Admin',
          variables: {
            brand_name: brandName,
            test_email: testEmail
          }
        },
      });

      if (error) throw error;

      if (data?.success) {
        toast({ title: 'Berhasil', description: data.message });
      } else {
        throw new Error(data?.message || 'Failed to send test email');
      }
    } catch (error: any) {
      console.error('Test email error:', error);
      toast({ title: 'Error', description: error.message || 'Gagal mengirim email uji coba', variant: 'destructive' });
    } finally {
      setSendingTest(false);
    }
  };

  const isEmailConfigured = settings.integration_email_api_token && settings.integration_email_from_email;

  if (loading) return <div className="animate-pulse h-64 bg-muted rounded-md" />;

  return (
    <div className="space-y-6">
      {/* n8n / Webhook */}
      <Card className="border-2 border-border">
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Webhook className="w-5 h-5" />
            n8n / Webhook
          </CardTitle>
          <CardDescription>
            Konfigurasi URL untuk integrasi otomatisasi
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="space-y-2">
            <Label>Base URL n8n / Integrasi</Label>
            <Input
              value={settings.integration_n8n_base_url}
              onChange={(e) => setSettings({ ...settings, integration_n8n_base_url: e.target.value })}
              placeholder="https://automation.domain.com"
              className="border-2"
            />
            <p className="text-sm text-muted-foreground">
              Digunakan sebagai target default untuk webhook lanjutan. webhook_url per template tetap harus URL lengkap.
            </p>
          </div>

          <div className="flex items-center justify-between p-4 border rounded-lg space-y-0">
            <div className="space-y-0.5">
              <Label>Mode Test n8n</Label>
              <p className="text-sm text-muted-foreground">
                Aktifkan untuk menggunakan webhook path /webhook-test/ instead of /webhook/
              </p>
            </div>
            <Switch
              checked={settings.integration_n8n_test_mode}
              onCheckedChange={(checked) => setSettings({ ...settings, integration_n8n_test_mode: checked })}
            />
          </div>

          {settings.integration_n8n_test_mode && (
            <Alert>
              <AlertTriangle className="w-4 h-4" />
              <AlertDescription>
                Mode test aktif: Webhook akan menggunakan path <code>/webhook-test/</code>
              </AlertDescription>
            </Alert>
          )}
        </CardContent>
      </Card>

      {/* WhatsApp */}
      <Card className="border-2 border-border">
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <MessageSquare className="w-5 h-5" />
            WhatsApp
          </CardTitle>
          <CardDescription>
            Nomor kontak untuk dukungan dan notifikasi
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label>Nomor WhatsApp Dukungan</Label>
              <Input
                value={settings.integration_whatsapp_number}
                onChange={(e) => setSettings({ ...settings, integration_whatsapp_number: e.target.value })}
                placeholder="+62812xxxx"
                className="border-2"
              />
              <p className="text-sm text-muted-foreground">
                Ditampilkan di konfirmasi konsultasi
              </p>
            </div>

            <div className="space-y-2">
              <Label>URL WhatsApp Click-to-Chat (Opsional)</Label>
              <Input
                value={settings.integration_whatsapp_url}
                onChange={(e) => setSettings({ ...settings, integration_whatsapp_url: e.target.value })}
                placeholder="https://wa.me/62812..."
                className="border-2"
              />
            </div>
          </div>
        </CardContent>
      </Card>

      {/* Google Calendar */}
      <Card className="border-2 border-border">
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Calendar className="w-5 h-5" />
            Google Calendar
          </CardTitle>
          <CardDescription>
            Untuk pembuatan event konsultasi otomatis
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="space-y-2">
            <Label>ID Kalender Google untuk Konsultasi</Label>
            <Input
              value={settings.integration_google_calendar_id}
              onChange={(e) => setSettings({ ...settings, integration_google_calendar_id: e.target.value })}
              placeholder="your-calendar@gmail.com"
              className="border-2"
            />
            <p className="text-sm text-muted-foreground">
              Backend akan menggunakan ID ini untuk membuat event
            </p>
          </div>

          <div className="space-y-2">
            <Label className="flex items-center gap-2">
              <Key className="w-4 h-4" />
              Google OAuth Config
            </Label>
            <Textarea
              value={settings.google_oauth_config || ''}
              onChange={(e) => setSettings({ ...settings, google_oauth_config: e.target.value })}
              placeholder='{"client_id": "...", "client_secret": "...", "refresh_token": "..."}'
              className="min-h-[120px] font-mono text-sm border-2"
            />
            <div className="space-y-1">
              <p className="text-sm text-muted-foreground">
                OAuth2 credentials untuk personal Gmail account. Gunakan <a href="/get-google-refresh-token.html" target="_blank" className="text-blue-600 underline">tool ini</a> untuk generate refresh token.
              </p>
            </div>
          </div>

          <Button
            variant="outline"
            onClick={async () => {
              if (!settings.integration_google_calendar_id || !settings.google_oauth_config) {
                toast({ title: "Error", description: "Lengkapi Calendar ID dan OAuth Config", variant: "destructive" });
                return;
              }

              if (isTestRunning) {
                return; // Prevent React Strict Mode double-call
              }

              setIsTestRunning(true);

              try {
                const { data, error } = await supabase.functions.invoke('create-google-meet-event', {
                  body: {
                    slot_id: 'test-connection',
                    date: new Date().toISOString().split('T')[0],
                    start_time: '14:00:00',
                    end_time: '15:00:00',
                    client_name: 'Test Connection',
                    client_email: 'test@example.com',
                    topic: 'Connection Test',
                  },
                });

                if (error) throw error;
                if (data?.success) {
                  toast({ title: "Berhasil", description: "Google Calendar API berfungsi! Event test dibuat." });
                } else {
                  throw new Error(data?.message || 'Connection failed');
                }
              } catch (err: any) {
                toast({ title: "Error", description: err.message, variant: "destructive" });
              } finally {
                setIsTestRunning(false);
              }
            }}
            disabled={isTestRunning}
            className="w-full border-2"
          >
            Test Google Calendar Connection
          </Button>
        </CardContent>
      </Card>

      {/* Email Provider */}
      <Card className="border-2 border-border">
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Mail className="w-5 h-5" />
            Provider Email
          </CardTitle>
          <CardDescription>
            Konfigurasi provider email untuk pengiriman notifikasi
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          {!isEmailConfigured && (
            <Alert variant="destructive" className="border-2">
              <AlertTriangle className="w-4 h-4" />
              <AlertDescription>
                Konfigurasi email provider belum lengkap. Email tidak akan terkirim.
              </AlertDescription>
            </Alert>
          )}

          <div className="space-y-4">
            <div className="space-y-2">
              <Label>Provider Email</Label>
              <Select
                value={settings.integration_email_provider}
                onValueChange={(value: 'mailketing') => setSettings({ ...settings, integration_email_provider: value })}
              >
                <SelectTrigger className="border-2">
                  <SelectValue placeholder="Pilih provider email" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="mailketing">Mailketing</SelectItem>
                </SelectContent>
              </Select>
            </div>

            {settings.integration_email_provider === 'mailketing' && (
              <>
                <div className="space-y-2">
                  <Label className="flex items-center gap-2">
                    <Key className="w-4 h-4" />
                    API Token
                  </Label>
                  <Input
                    type="password"
                    value={settings.integration_email_api_token}
                    onChange={(e) => setSettings({ ...settings, integration_email_api_token: e.target.value })}
                    placeholder="Masukkan API token dari Mailketing"
                    className="border-2"
                  />
                  <p className="text-sm text-muted-foreground">
                    Dapatkan API token dari menu Integration di dashboard Mailketing
                  </p>
                </div>

                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div className="space-y-2">
                    <Label>Nama Pengirim</Label>
                    <Input
                      value={settings.integration_email_from_name}
                      onChange={(e) => setSettings({ ...settings, integration_email_from_name: e.target.value })}
                      placeholder="Nama Bisnis"
                      className="border-2"
                    />
                  </div>
                  <div className="space-y-2">
                    <Label>Email Pengirim</Label>
                    <Input
                      type="email"
                      value={settings.integration_email_from_email}
                      onChange={(e) => setSettings({ ...settings, integration_email_from_email: e.target.value })}
                      placeholder="info@domain.com"
                      className="border-2"
                    />
                    <p className="text-sm text-muted-foreground">
                      Pastikan email sudah terdaftar di Mailketing
                    </p>
                  </div>
                </div>

                <div className="flex gap-4 pt-4 border-t">
                  <Input
                    type="email"
                    value={testEmail}
                    onChange={(e) => setTestEmail(e.target.value)}
                    placeholder="Email uji coba"
                    className="border-2 flex-1"
                  />
                  <Button variant="outline" onClick={sendTestEmail} className="border-2 flex-1" disabled={sendingTest}>
                    <Send className="w-4 h-4 mr-2" />
                    {sendingTest ? 'Mengirim...' : 'Kirim Email Uji Coba'}
                  </Button>
                </div>
              </>
            )}
          </div>
        </CardContent>
      </Card>

      {/* Public Links */}
      <Card className="border-2 border-border">
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <LinkIcon className="w-5 h-5" />
            Link Publik
          </CardTitle>
          <CardDescription>
            URL untuk halaman legal
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label>URL Kebijakan Privasi</Label>
              <Input
                value={settings.integration_privacy_url}
                onChange={(e) => setSettings({ ...settings, integration_privacy_url: e.target.value })}
                placeholder="/privacy"
                className="border-2"
              />
            </div>

            <div className="space-y-2">
              <Label>URL Syarat & Ketentuan</Label>
              <Input
                value={settings.integration_terms_url}
                onChange={(e) => setSettings({ ...settings, integration_terms_url: e.target.value })}
                placeholder="/terms"
                className="border-2"
              />
            </div>
          </div>
          <p className="text-sm text-muted-foreground">
            Default: halaman internal. Bisa diganti dengan URL eksternal.
          </p>
        </CardContent>
      </Card>

      <div className="flex gap-4 pt-4 border-t-2 border-border">
        <Button onClick={saveSettings} disabled={saving} className="shadow-sm flex-1">
          {saving ? 'Menyimpan...' : 'Simpan Semua Pengaturan'}
        </Button>
      </div>
    </div>
  );
}