import { askOpenAI } from "./llm.js";
import { curateText } from "./curation.js";
import { queryCollectionDataEnhanced, queryCollectionData } from "./vector.js";
import { loadContextTreeDocuments } from "../utils.js";

export async function routeUserInput(input, config) {
  try {
    const intent = await classifyIntent(input, config);

    switch (intent.type) {
      case "search":
        return await handleSearch(input, intent, config);

      case "curate":
        return await handleCurate(input, intent, config);

      case "add":
        return await handleAdd(input, intent, config);

      case "list":
        return await handleList(input, intent, config);

      default:
        return {
          error: "Could not determine intent",
          input,
          intent: intent.type,
        };
    }
  } catch (error) {
    return {
      error: `Routing failed: ${error.message}`,
      input,
    };
  }
}

async function classifyIntent(input, config) {
  const prompt = `Analyze this user input and classify the intent. Return ONLY valid JSON:

Input: "${input}"

Classify as one of these intents:
- "search": User is asking questions to find knowledge
- "curate": User is teaching/storing new knowledge
- "add": User is adding documents to the knowledge base
- "list": User wants to see all stored knowledge

Response format (valid JSON only):
{
  "type": "search|curate|add|list",
  "confidence": 0.0-1.0,
  "reasoning": "brief explanation",
  "hints": {
    "enhanced": false,
    "rerank": false,
    "extractText": null
  }
}`;

  try {
    const response = await askOpenAI(input, prompt);
    const parsed = JSON.parse(response);
    return parsed;
  } catch (error) {
    console.error("Intent classification failed:", error.message);
    return { type: "search", confidence: 0.5, reasoning: "Fallback to search" };
  }
}

async function handleSearch(input, intent, config) {
  try {
    const searchParams = {
      query: input,
      nResults: 5,
      enhanced: intent.hints?.enhanced || false,
      rerank: intent.hints?.rerank || false,
    };

    const results = searchParams.enhanced
      ? await queryCollectionDataEnhanced(searchParams)
      : await queryCollectionData(searchParams);

    const documents = results.ids?.[0] || [];
    const contents = results.documents?.[0] || [];
    const metadatas = results.metadatas?.[0] || [];

    if (documents.length === 0) {
      return {
        intent: "search",
        query: input,
        answer: "No matching knowledge found. Please curate relevant documentation first.",
      };
    }

    const answer = contents
      .map((content, idx) => {
        const meta = metadatas[idx] || {};
        return `**${meta.title || documents[idx]}** (${meta.topic || "general"})\n${content}`;
      })
      .join("\n\n---\n\n");

    return {
      intent: "search",
      query: input,
      answer,
    };
  } catch (error) {
    return {
      intent: "search",
      error: `Search failed: ${error.message}`,
      query: input,
    };
  }
}

async function handleCurate(input, intent, config) {
  try {
    const textToCurate = intent.hints?.extractText || input;

    const result = await curateText(textToCurate, config);

    return {
      intent: "curate",
      action: "extracted_and_stored",
      result,
    };
  } catch (error) {
    return {
      intent: "curate",
      error: `Curation failed: ${error.message}`,
      input,
    };
  }
}

async function handleAdd(input, intent, config) {
  return {
    intent: "add",
    message:
      "To add documents, use the add_documents tool with an array of {id, text, metadata}",
    guidance: input,
  };
}

async function handleList(input, intent, config) {
  try {
    const dataDir = process.env.DATA_DIR || "/data";
    const docs = await loadContextTreeDocuments(dataDir);

    return {
      intent: "list",
      count: docs.length,
      documents: docs.map((d) => ({
        id: d.id,
        title: d.title,
        topic: d.topic,
        type: d.type,
        importance: d.importance,
        filePath: d.filePath,
      })),
    };
  } catch (error) {
    return {
      intent: "list",
      error: `List failed: ${error.message}`,
    };
  }
}