import { QdrantClient } from '@qdrant/js-client-rest';

const isDockerContainer =
  process.env.IS_DOCKER === 'true' || process.env.HOSTNAME?.includes('klz-app');
const qdrantUrl =
  process.env.QDRANT_URL ||
  (isDockerContainer ? 'http://klz-qdrant:6333' : 'http://localhost:6333');
const qdrantApiKey = process.env.QDRANT_API_KEY || '';

export const qdrant = new QdrantClient({
  url: qdrantUrl,
  apiKey: qdrantApiKey || undefined,
});

export const COLLECTION_NAME = 'klz_products';
export const VECTOR_SIZE = 1536; // OpenAI text-embedding-3-small

/**
 * Ensure the collection exists in Qdrant.
 */
export async function ensureCollection() {
  try {
    const collections = await qdrant.getCollections();
    const exists = collections.collections.some((c) => c.name === COLLECTION_NAME);
    if (!exists) {
      await qdrant.createCollection(COLLECTION_NAME, {
        vectors: {
          size: VECTOR_SIZE,
          distance: 'Cosine',
        },
      });
      console.log(`Successfully created Qdrant collection: ${COLLECTION_NAME}`);
    }
  } catch (error) {
    console.error('Error ensuring Qdrant collection:', error);
  }
}

/**
 * Generate an embedding for a given text using OpenRouter (OpenAI embedding proxy)
 */
export async function generateEmbedding(text: string): Promise<number[]> {
  const openRouterKey = process.env.OPENROUTER_API_KEY;
  if (!openRouterKey) {
    throw new Error('OPENROUTER_API_KEY is not set');
  }

  const response = await fetch('https://openrouter.ai/api/v1/embeddings', {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${openRouterKey}`,
      'Content-Type': 'application/json',
      'HTTP-Referer': process.env.NEXT_PUBLIC_BASE_URL || 'https://klz-cables.com',
      'X-Title': 'KLZ Cables Search AI',
    },
    body: JSON.stringify({
      model: 'openai/text-embedding-3-small',
      input: text,
    }),
  });

  if (!response.ok) {
    const errorBody = await response.text();
    throw new Error(
      `Failed to generate embedding: ${response.status} ${response.statusText} ${errorBody}`,
    );
  }

  const data = await response.json();
  return data.data[0].embedding;
}

/**
 * Upsert a product into Qdrant
 */
export async function upsertProductVector(
  id: string | number,
  text: string,
  payload: Record<string, any>,
) {
  try {
    await ensureCollection();
    const vector = await generateEmbedding(text);

    await qdrant.upsert(COLLECTION_NAME, {
      wait: true,
      points: [
        {
          id: id,
          vector,
          payload,
        },
      ],
    });
  } catch (error) {
    console.error('Error writing to Qdrant:', error);
  }
}

/**
 * Delete a product from Qdrant
 */
export async function deleteProductVector(id: string | number) {
  try {
    await ensureCollection();
    await qdrant.delete(COLLECTION_NAME, {
      wait: true,
      points: [id] as [string | number],
    });
  } catch (error) {
    console.error('Error deleting from Qdrant:', error);
  }
}

/**
 * Search products in Qdrant
 */
export async function searchProducts(query: string, limit = 5) {
  try {
    await ensureCollection();
    const vector = await generateEmbedding(query);

    const results = await qdrant.search(COLLECTION_NAME, {
      vector,
      limit,
      with_payload: true,
    });

    return results;
  } catch (error) {
    console.error('Error searching in Qdrant:', error);
    return [];
  }
}