import { prisma } from './prisma';
import { whatsappQueue } from './queue';

export class KBService {
    static async uploadAndIndex(organizationId: string, fileBuffer: Buffer, filename: string, mimeType: string) {
        const { uploadFile } = await import('./storage');
        const publicUrl = await uploadFile(fileBuffer, filename, mimeType, organizationId);

        await prisma.organization.update({
            where: { id: organizationId },
            data: { knowledgeBaseUrl: publicUrl }
        });

        await whatsappQueue.add('process-kb', { organizationId, url: publicUrl });

        const chunkCount = await prisma.knowledgeBaseEntry.count({ where: { organizationId } });
        return { publicUrl, chunkCount };
    }

    static async getStats(organizationId: string) {
        const [chunkCount, org] = await Promise.all([
            prisma.knowledgeBaseEntry.count({ where: { organizationId } }),
            prisma.organization.findUnique({ where: { id: organizationId }, select: { knowledgeBaseUrl: true } })
        ]);
        return { chunkCount, hasKnowledgeBase: !!org?.knowledgeBaseUrl, knowledgeBaseUrl: org?.knowledgeBaseUrl };
    }

    static async listChunks(organizationId: string, page: number, limit: number) {
        const skip = (page - 1) * limit;
        const [entries, total] = await Promise.all([
            prisma.knowledgeBaseEntry.findMany({
                where: { organizationId },
                orderBy: { createdAt: 'desc' },
                skip,
                take: limit,
                select: { id: true, content: true, metadata: true, createdAt: true }
            }),
            prisma.knowledgeBaseEntry.count({ where: { organizationId } })
        ]);
        return { entries, total, page, limit };
    }

    static async deleteChunk(organizationId: string, entryId: string) {
        const entry = await prisma.knowledgeBaseEntry.findFirst({ where: { id: entryId, organizationId } });
        if (!entry) return false;
        await prisma.knowledgeBaseEntry.delete({ where: { id: entryId } });
        return true;
    }
}