// consolidationWorker.js
// reads from event_knowledge (never writes to it) and maintains company_facts
// runs on a slow loop — one full pass over all tracked companies per cycle

const https = require("https");
const http = require("http");


async function runConsolidationWorker(archiveDb, intelligenceDb, config) {
  const loopDelay = config.workers?.consolidationLoopDelayMs ?? 60000;
  const llmConfig = config.openRouter || {};

  const getCompanies = intelligenceDb.prepare("SELECT * FROM tracked_companies");

  const recordEvent = intelligenceDb.prepare(
    `INSERT INTO worker_events (worker) VALUES ('consolidation')`
  );
  const pruneEvents = intelligenceDb.prepare(
    `DELETE FROM worker_events WHERE worker = 'consolidation' AND completed_at < datetime('now', '-1 hour')`
  );

  const getKnowledge = intelligenceDb.prepare(`
    SELECT * FROM event_knowledge WHERE company_id = ? ORDER BY event_date ASC
  `);

  const getExistingFirstSeen = intelligenceDb.prepare(`
    SELECT claim, first_seen_at FROM company_facts WHERE company_id = ?
  `);

  const deleteCompanyFacts = intelligenceDb.prepare(
    "DELETE FROM company_facts WHERE company_id = ?"
  );

  const insertFact = intelligenceDb.prepare(`
    INSERT INTO company_facts
      (company_id, type, claim, confidence, confirmation_count, first_seen_at, last_seen_at, last_event_id, supporting_event_ids)
    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
  `);

  // stale = seen only once and not reinforced in 90 days
  const deleteStaleFacts = intelligenceDb.prepare(`
    DELETE FROM company_facts
    WHERE confirmation_count = 1
      AND last_seen_at < datetime('now', '-90 days')
  `);

  while (true) {
    try {
      const companies = getCompanies.all();

      let pruneCounter = 0;
      for (const company of companies) {
        try {
          await processCompany(
            company, intelligenceDb, llmConfig,
            getKnowledge, getExistingFirstSeen, deleteCompanyFacts, insertFact
          );
          recordEvent.run();
          pruneCounter++;
          if (pruneCounter >= 50) { pruneEvents.run(); pruneCounter = 0; }
        } catch (err) {
          console.error(`[consolidation] error on ${company.name}:`, err.message);
        }
      }

      const staleResult = deleteStaleFacts.run();
      if (staleResult.changes > 0) {
        console.log(`[consolidation] pruned ${staleResult.changes} stale facts`);
      }

      console.log("[consolidation] cycle complete");

    } catch (err) {
      console.error("[consolidation] cycle error:", err.message);
    }

    await sleep(loopDelay);
  }
}


async function processCompany(company, intelligenceDb, llmConfig, getKnowledge, getExistingFirstSeen, deleteCompanyFacts, insertFact) {
  const rows = getKnowledge.all(company.id);
  if (rows.length === 0) return;

  const rawClaims = [];

  for (const row of rows) {
    let data;
    try { data = JSON.parse(row.data); } catch (_) { continue; }

    const text = extractClaimText(row.type, data);
    if (!text) continue;

    rawClaims.push({
      text,
      type: row.type,
      eventId: row.event_id,
      eventDate: row.event_date || row.created_at,
    });
  }

  if (rawClaims.length === 0) return;

  let groups;
  try {
    groups = await normalizeClaims(company.name, rawClaims, llmConfig);
  } catch (err) {
    console.error(`[consolidation] LLM failed for ${company.name}:`, err.message);
    return;
  }

  if (!groups || groups.length === 0) return;

  // save first_seen_at before we wipe the rows
  const priorFirstSeen = {};
  for (const f of getExistingFirstSeen.all(company.id)) {
    priorFirstSeen[f.claim] = f.first_seen_at;
  }

  const writeAll = intelligenceDb.transaction(() => {
    deleteCompanyFacts.run(company.id);

    for (const group of groups) {
      const { canonical, type, eventIds, dates } = group;

      const distinctEventIds = [...new Set(eventIds)];
      const count = distinctEventIds.size || distinctEventIds.length;

      const sortedDates = dates.filter(Boolean).sort();
      const firstSeen = priorFirstSeen[canonical] || sortedDates[0] || new Date().toISOString();
      const lastSeen = sortedDates[sortedDates.length - 1] || firstSeen;

      const lastEventId = eventIds[eventIds.length - 1];
      const confidence = countToConfidence(count);

      insertFact.run(
        company.id,
        type,
        canonical,
        confidence,
        count,
        firstSeen,
        lastSeen,
        lastEventId,
        JSON.stringify(distinctEventIds)
      );
    }
  });

  writeAll();
  console.log(`[consolidation] ${company.name}: ${groups.length} distinct facts`);
}


function extractClaimText(type, data) {
  if (type === "relationship") {
    if (!data.entity) return null;
    return `${data.entity} is a ${data.type || "partner"}`;
  }

  if (type === "theme") {
    if (!data.theme) return null;
    return `${data.theme} is ${data.direction || "relevant"}`;
  }

  if (type === "factor") {
    if (!data.factor) return null;
    return `${data.factor}: ${data.relationship || "relevant"}`;
  }

  return null;
}


function countToConfidence(count) {
  if (count >= 8) return "very_high";
  if (count >= 4) return "high";
  if (count >= 2) return "medium";
  return "low";
}


async function normalizeClaims(companyName, rawClaims, llmConfig) {
  // cap to keep the prompt manageable
  const capped = rawClaims.slice(0, 120);

  const lines = capped.map((c, i) => `${i + 1}. [${c.type}] ${c.text}`).join("\n");

  const prompt = `You are normalizing knowledge claims about ${companyName}. Always respond in English regardless of the language of the input articles.

Group semantically equivalent claims and provide a canonical short form for each group (lowercase, no punctuation).

Claims:
${lines}

Return JSON only — no explanation. Shape:
{
  "groups": [
    { "canonical": "canonical claim text", "type": "relationship|theme|factor", "indices": [1, 2] }
  ]
}

Rules:
- canonical must be lowercase with no punctuation marks
- merge claims that mean the same thing even if worded differently
- each index appears in exactly one group
- pick the type that best fits the group`;

  const body = JSON.stringify({
    model: llmConfig.llmModel || llmConfig.model,
    messages: [{ role: "user", content: prompt }],
    temperature: 0.1,
  });

  const url = new URL("https://openrouter.ai/api/v1/chat/completions");
  const responseText = await httpPost(url, body, {
    "Content-Type": "application/json",
    "Authorization": `Bearer ${llmConfig.apiKey || ""}`,
  });

  let parsed;
  try {
    parsed = JSON.parse(responseText);
  } catch (_) {
    throw new Error(`LLM response not JSON: ${responseText.slice(0, 200)}`);
  }

  const content = parsed.choices?.[0]?.message?.content;
  if (!content) return [];

  const stripped = content.replace(/^```(?:json)?\s*/i, "").replace(/\s*```$/, "").trim();
  const result = JSON.parse(stripped);

  const groups = [];

  for (const g of (result.groups || [])) {
    const indices = (g.indices || [])
      .map(i => i - 1)
      .filter(i => i >= 0 && i < capped.length);

    if (indices.length === 0) continue;

    const eventIds = indices.map(i => capped[i].eventId);
    const dates = indices.map(i => capped[i].eventDate);
    const type = g.type || capped[indices[0]].type;

    groups.push({ canonical: g.canonical, type, eventIds, dates });
  }

  return groups;
}


function httpPost(url, body, headers) {
  return new Promise((resolve, reject) => {
    const lib = url.protocol === "https:" ? https : http;

    const req = lib.request({
      hostname: url.hostname,
      port: url.port || (url.protocol === "https:" ? 443 : 80),
      path: url.pathname + url.search,
      method: "POST",
      headers: { ...headers, "Content-Length": Buffer.byteLength(body) },
    }, (res) => {
      let data = "";
      res.on("data", chunk => data += chunk);
      res.on("end", () => {
        if (res.statusCode >= 200 && res.statusCode < 300) resolve(data);
        else reject(new Error(`LLM ${res.statusCode}: ${data.slice(0, 300)}`));
      });
    });

    req.on("error", reject);
    req.write(body);
    req.end();
  });
}

function sleep(ms) {
  return new Promise(r => setTimeout(r, ms));
}

module.exports = { runConsolidationWorker };