'use client';

import {
  componentsV2HasContent,
  embedHasContent,
  type DashboardMessageMode,
  type MessageComponentsV2,
  type WelcomeEmbed
} from '@nexumi/shared';
import { Send } from 'lucide-react';
import { useState } from 'react';
import { toast } from 'sonner';
import { FieldAnchor } from '@/components/layout/field-anchor';
import { useTranslations } from '@/components/locale-provider';
import { Button } from '@/components/ui/button';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { DiscordChannelSelect } from '@/components/ui/discord-channel-select';
import {
  DiscordComponentsV2Builder,
  emptyComponentsV2,
  normalizeComponentsV2
} from '@/components/ui/discord-components-v2-builder';
import { DiscordEmbedBuilder, emptyEmbed, normalizeEmbed } from '@/components/ui/discord-embed-builder';
import { Label } from '@/components/ui/label';
import { cn } from '@/lib/utils';

interface MessagesManagerProps {
  guildId: string;
}

export function MessagesManager({ guildId }: MessagesManagerProps) {
  const t = useTranslations();
  const [channelId, setChannelId] = useState('');
  const [mode, setMode] = useState<DashboardMessageMode>('EMBED');
  const [embed, setEmbed] = useState<WelcomeEmbed | null>(emptyEmbed());
  const [components, setComponents] = useState<MessageComponentsV2 | null>(emptyComponentsV2());
  const [sending, setSending] = useState(false);

  async function handleSend() {
    if (!channelId.trim()) {
      toast.error(t('modulePages.messages.channelRequired'));
      return;
    }

    const normalizedEmbed = mode === 'EMBED' ? normalizeEmbed(embed) : null;
    const normalizedComponents = mode === 'COMPONENTS_V2' ? normalizeComponentsV2(components) : null;

    if (
      mode === 'EMBED' &&
      !embedHasContent(normalizedEmbed) &&
      normalizedEmbed?.color === undefined
    ) {
      toast.error(t('modulePages.messages.embedRequired'));
      return;
    }

    if (mode === 'COMPONENTS_V2' && !componentsV2HasContent(normalizedComponents)) {
      toast.error(t('modulePages.messages.componentsRequired'));
      return;
    }

    setSending(true);
    try {
      const response = await fetch(`/api/guilds/${guildId}/messages`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          channelId: channelId.trim(),
          mode,
          embed: normalizedEmbed,
          components: normalizedComponents
        })
      });
      const body = (await response.json().catch(() => null)) as { error?: string; messageId?: string | null } | null;
      if (!response.ok || !body) {
        toast.error(body?.error ?? t('common.saveError'));
        return;
      }
      toast.success(
        body.messageId
          ? t('modulePages.messages.sentWithId', { id: body.messageId })
          : t('modulePages.messages.sent')
      );
    } catch {
      toast.error(t('common.saveError'));
    } finally {
      setSending(false);
    }
  }

  return (
    <FieldAnchor id="field-messages-send">
      <Card>
        <CardHeader>
          <CardTitle>{t('modulePages.messages.sendTitle')}</CardTitle>
          <CardDescription>{t('modulePages.messages.sendDescription')}</CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="space-y-2">
            <Label>{t('modulePages.messages.channelId')}</Label>
            <DiscordChannelSelect guildId={guildId} value={channelId} onChange={setChannelId} />
          </div>

          <div className="space-y-2">
            <Label>{t('modulePages.messages.mode')}</Label>
            <div className="flex flex-wrap gap-2">
              {(['EMBED', 'COMPONENTS_V2'] as DashboardMessageMode[]).map((entry) => (
                <Button
                  key={entry}
                  type="button"
                  variant={mode === entry ? 'default' : 'outline'}
                  size="sm"
                  className={cn(mode !== entry && 'text-muted-foreground')}
                  onClick={() => setMode(entry)}
                >
                  {t(`modulePages.messages.modes.${entry}`)}
                </Button>
              ))}
            </div>
          </div>

          {mode === 'EMBED' ? (
            <DiscordEmbedBuilder
              value={embed}
              onChange={setEmbed}
              placeholderPreset="scheduler"
              showClearHint={false}
            />
          ) : (
            <DiscordComponentsV2Builder
              guildId={guildId}
              value={components}
              onChange={setComponents}
              placeholderPreset="scheduler"
              showClearHint={false}
            />
          )}

          <Button type="button" onClick={handleSend} disabled={sending}>
            <Send className="size-4" />
            {sending ? t('modulePages.messages.sending') : t('modulePages.messages.send')}
          </Button>
        </CardContent>
      </Card>
    </FieldAnchor>
  );
}