const fs = require('fs');
const path = require('path');
const db = require('../db');
const config = require('../config');
const Database = require('better-sqlite3');

let idb = null;

function getIntelligenceDb() {
  if (idb) return idb;

  const configDir = path.resolve(__dirname, '..', '..');
  const rawPath = process.env.INTELLIGENCE_DB
    || (config.intelligence_db
      ? (path.isAbsolute(config.intelligence_db) ? config.intelligence_db : path.resolve(configDir, config.intelligence_db))
      : path.resolve(configDir, 'intelligence.sqlite'));

  if (!fs.existsSync(rawPath)) return null;

  idb = new Database(rawPath);
  return idb;
}

const adminUser = (config.admin && config.admin.username) || 'admin';
const adminPass = (config.admin && config.admin.password) || 'changeme';

function checkAuth(request, reply) {
  const header = request.headers['authorization'] || '';
  if (!header.startsWith('Basic ')) {
    reply.header('WWW-Authenticate', 'Basic realm="Duriin Admin"');
    reply.code(401).send('Unauthorized');
    return false;
  }

  const decoded = Buffer.from(header.slice(6), 'base64').toString('utf8');
  const colon = decoded.indexOf(':');
  const user = decoded.slice(0, colon);
  const pass = decoded.slice(colon + 1);

  if (user !== adminUser || pass !== adminPass) {
    reply.header('WWW-Authenticate', 'Basic realm="Duriin Admin"');
    reply.code(401).send('Unauthorized');
    return false;
  }

  return true;
}

const htmlPath = path.join(__dirname, '..', '..', 'admin.html');

async function adminRoutes(fastify) {

  fastify.get('/admin', async (request, reply) => {
    if (!checkAuth(request, reply)) return;
    reply.type('text/html');
    return fs.createReadStream(htmlPath);
  });

  // list articles — all of them, not just the ones with embeddings
  fastify.get('/admin/api/articles', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const q = request.query || {};
    const limit = Math.min(parseInt(q.limit, 10) || 50, 200);
    const offset = parseInt(q.offset, 10) || 0;

    const conditions = [];
    const params = [];

    if (q.keyword) {
      conditions.push('(title LIKE ? OR description LIKE ? OR content LIKE ?)');
      const like = `%${q.keyword}%`;
      params.push(like, like, like);
    }

    if (q.source) {
      conditions.push('source = ?');
      params.push(q.source);
    }

    if (q.content_status) {
      if (q.content_status === 'null') {
        conditions.push('content_status IS NULL');
      } else {
        conditions.push('content_status = ?');
        params.push(q.content_status);
      }
    }

    if (q.from) {
      conditions.push('ingested_at >= ?');
      params.push(q.from);
    }

    if (q.to) {
      conditions.push('ingested_at <= ?');
      params.push(q.to);
    }

    const where = conditions.length ? `WHERE ${conditions.join(' AND ')}` : '';

    const total = db.prepare(`SELECT COUNT(*) as n FROM articles ${where}`).get(...params).n;

    params.push(limit, offset);
    const rows = db.prepare(`
      SELECT id, title, url, source, pub_date, ingested_at, content_status, is_index_page, has_embedding, language
      FROM articles
      ${where}
      ORDER BY ingested_at DESC, id DESC
      LIMIT ? OFFSET ?
    `).all(...params);

    return { total, rows };
  });

  fastify.get('/admin/api/articles/:id', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const row = db.prepare(`
      SELECT id, title, description, content, url, normalized_title, source,
             pub_date, pub_date_effective, ingested_at, content_status, content_error,
             content_attempted_at, content_attempt_count, is_index_page, has_embedding, language, event_id
      FROM articles WHERE id = ?
    `).get(request.params.id);

    if (!row) { reply.code(404); return { error: 'not found' }; }
    return row;
  });

  fastify.patch('/admin/api/articles/:id', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const id = parseInt(request.params.id, 10);
    const body = request.body || {};

    // only allow editing these fields
    const allowed = ['title', 'description', 'content', 'content_status', 'is_index_page', 'language', 'pub_date'];
    const updates = [];
    const params = [];

    for (const key of allowed) {
      if (Object.prototype.hasOwnProperty.call(body, key)) {
        updates.push(`${key} = ?`);
        params.push(body[key]);
      }
    }

    if (updates.length === 0) {
      reply.code(400);
      return { error: 'no valid fields provided' };
    }

    params.push(id);
    db.prepare(`UPDATE articles SET ${updates.join(', ')} WHERE id = ?`).run(...params);
    return { ok: true };
  });

  fastify.delete('/admin/api/articles/:id', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const id = parseInt(request.params.id, 10);

    // remove embeddings first so foreign key stuff doesnt bite us
    db.prepare(`DELETE FROM article_embedding_store WHERE article_id = ?`).run(id);
    db.prepare(`DELETE FROM article_embedding_meta WHERE article_id = ?`).run(id);

    try {
      db.prepare(`DELETE FROM article_embeddings WHERE article_id = ?`).run(id);
    } catch (_) {}

    db.prepare(`DELETE FROM articles WHERE id = ?`).run(id);
    return { ok: true };
  });

  // sources list for filter dropdown
  fastify.get('/admin/api/sources', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const rows = db.prepare(`SELECT DISTINCT source FROM articles ORDER BY source`).all();
    return rows.map(r => r.source);
  });

  // events
  fastify.get('/admin/api/events', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const q = request.query || {};
    const limit = Math.min(parseInt(q.limit, 10) || 50, 200);
    const offset = parseInt(q.offset, 10) || 0;

    const total = db.prepare(`SELECT COUNT(*) as n FROM events`).get().n;
    const rows = db.prepare(`
      SELECT e.id, e.title, e.created_at, COUNT(a.id) as article_count
      FROM events e
      LEFT JOIN articles a ON a.event_id = e.id
      GROUP BY e.id
      ORDER BY e.created_at DESC
      LIMIT ? OFFSET ?
    `).all(limit, offset);

    return { total, rows };
  });

  fastify.delete('/admin/api/events/:id', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const id = parseInt(request.params.id, 10);
    // detach articles from this event but dont delete the articles themselves
    db.prepare(`UPDATE articles SET event_id = NULL WHERE event_id = ?`).run(id);
    db.prepare(`DELETE FROM events WHERE id = ?`).run(id);
    return { ok: true };
  });

  fastify.patch('/admin/api/events/:id', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const id = parseInt(request.params.id, 10);
    const body = request.body || {};

    if (!body.title) { reply.code(400); return { error: 'title is required' }; }
    db.prepare(`UPDATE events SET title = ? WHERE id = ?`).run(body.title, id);
    return { ok: true };
  });

  // intelligence endpoints
  fastify.get('/admin/api/intelligence/stats', async (request, reply) => {
    if (!checkAuth(request, reply)) return;
    const db = getIntelligenceDb();
    if (!db) return { available: false };

    const queue = db.prepare(`SELECT status, COUNT(*) as n FROM article_queue GROUP BY status`).all();
    const knowledge = db.prepare(`SELECT COUNT(*) as n FROM event_knowledge`).get().n;
    const predictions = db.prepare(`SELECT COUNT(*) as n FROM event_predictions`).get().n;
    const companies = db.prepare(`SELECT COUNT(*) as n FROM tracked_companies`).get().n;
    const embeddings = db.prepare(`SELECT COUNT(*) as n FROM company_embeddings`).get().n;

    let workerRates = [];
    try {
      workerRates = db.prepare(`
        SELECT
          worker,
          SUM(CASE WHEN completed_at >= datetime('now', '-5 minutes') THEN 1 ELSE 0 END) as n5m,
          SUM(CASE WHEN completed_at >= datetime('now', '-1 minute') THEN 1 ELSE 0 END) as n1m
        FROM worker_events
        GROUP BY worker
      `).all();
    } catch (_) {}

    return { available: true, queue, knowledge, predictions, companies, embeddings, workerRates };
  });

  fastify.get('/admin/api/intelligence/companies', async (request, reply) => {
    if (!checkAuth(request, reply)) return;
    const db = getIntelligenceDb();
    if (!db) return [];
    return db.prepare(`SELECT * FROM tracked_companies ORDER BY name`).all();
  });

  fastify.get('/admin/api/intelligence/knowledge', async (request, reply) => {
    if (!checkAuth(request, reply)) return;
    const db = getIntelligenceDb();
    if (!db) return { total: 0, rows: [] };

    const q = request.query || {};
    const limit = Math.min(parseInt(q.limit, 10) || 50, 200);
    const offset = parseInt(q.offset, 10) || 0;
    const companyId = q.company_id ? parseInt(q.company_id, 10) : null;
    const type = q.type || null;

    const conditions = [];
    const params = [];
    if (companyId) { conditions.push('ek.company_id = ?'); params.push(companyId); }
    if (type) { conditions.push('ek.type = ?'); params.push(type); }
    const where = conditions.length ? `WHERE ${conditions.join(' AND ')}` : '';

    const sortCol = q.sort === 'event_date' ? 'ek.event_date' : 'ek.id';

    const total = db.prepare(`SELECT COUNT(*) as n FROM event_knowledge ek ${where}`).get(...params).n;
    const rows = db.prepare(`
      SELECT ek.id, ek.event_id, ek.type, ek.data, ek.event_date, ek.created_at,
             tc.name as company_name
      FROM event_knowledge ek
      JOIN tracked_companies tc ON tc.id = ek.company_id
      ${where}
      ORDER BY ${sortCol} DESC
      LIMIT ? OFFSET ?
    `).all(...params, limit, offset);

    return { total, rows };
  });

  fastify.get('/admin/api/intelligence/predictions', async (request, reply) => {
    if (!checkAuth(request, reply)) return;
    const db = getIntelligenceDb();
    if (!db) return { total: 0, rows: [] };

    const q = request.query || {};
    const limit = Math.min(parseInt(q.limit, 10) || 50, 200);
    const offset = parseInt(q.offset, 10) || 0;
    const companyId = q.company_id ? parseInt(q.company_id, 10) : null;

    const conditions = [];
    const params = [];
    if (companyId) { conditions.push('ep.company_id = ?'); params.push(companyId); }
    const where = conditions.length ? `WHERE ${conditions.join(' AND ')}` : '';

    const sortCol = q.sort === 'event_date' ? 'ep.event_date' : 'ep.id';

    const total = db.prepare(`SELECT COUNT(*) as n FROM event_predictions ep ${where}`).get(...params).n;
    const rows = db.prepare(`
      SELECT ep.*, tc.name as company_name
      FROM event_predictions ep
      JOIN tracked_companies tc ON tc.id = ep.company_id
      ${where}
      ORDER BY ${sortCol} DESC
      LIMIT ? OFFSET ?
    `).all(...params, limit, offset);

    return { total, rows };
  });

  // intelligence graph — nodes + edges from company_relationships
  fastify.get('/admin/api/intelligence/graph', async (request, reply) => {
    if (!checkAuth(request, reply)) return;
    const idb = getIntelligenceDb();
    if (!idb) return { nodes: [], edges: [] };

    const edges = idb.prepare(`SELECT * FROM company_relationships`).all();

    const trackedIds = new Set();
    for (const e of edges) {
      trackedIds.add(e.from_company_id);
      if (e.to_company_id) trackedIds.add(e.to_company_id);
    }

    const allTracked = idb.prepare(`SELECT id, name, ticker FROM tracked_companies`).all();

    // build a lowercase name+alias set so we can exclude untracked entities
    // that are just unresolved references to tracked companies
    const trackedNameSet = new Set();
    for (const c of allTracked) {
      trackedNameSet.add(c.name.toLowerCase());
      trackedNameSet.add(c.ticker.toLowerCase());
    }

    const untrackedSeen = new Set();
    for (const e of edges) {
      if (!e.to_company_id && e.to_entity) {
        if (!trackedNameSet.has(e.to_entity.toLowerCase())) {
          untrackedSeen.add(e.to_entity);
        }
      }
    }

    const nodes = [
      ...allTracked
        .filter(c => trackedIds.has(c.id))
        .map(c => ({ id: c.id, name: c.name, ticker: c.ticker, tracked: true })),

      ...[...untrackedSeen].map(name => ({ id: null, name, ticker: null, tracked: false })),
    ];

    return { nodes, edges };
  });


  // per-company facts for the graph sidebar
  fastify.get('/admin/api/intelligence/facts/:company_id', async (request, reply) => {
    if (!checkAuth(request, reply)) return;
    const idb = getIntelligenceDb();
    if (!idb) return [];

    const companyId = parseInt(request.params.company_id, 10);
    return idb.prepare(`
      SELECT type, claim, confidence, confirmation_count
      FROM company_facts
      WHERE company_id = ?
      ORDER BY confirmation_count DESC
      LIMIT 10
    `).all(companyId);
  });


  // raw sql console — supports multiple statements separated by ;
  fastify.post('/admin/api/sql', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const { sql, database } = request.body || {};
    if (!sql || !sql.trim()) { reply.code(400); return { error: 'no sql provided' }; }

    const target = database === 'intelligence' ? getIntelligenceDb() : db;
    if (!target) { reply.code(400); return { error: 'database not available' }; }

    // split on semicolons, drop empty statements
    const statements = sql.split(';').map(s => s.trim()).filter(s => s.length > 0);

    const results = [];
    const start = Date.now();

    for (const s of statements) {
      try {
        const stmt = target.prepare(s);
        if (stmt.reader) {
          results.push({ sql: s, rows: stmt.all() });
        } else {
          const info = stmt.run();
          results.push({ sql: s, changes: info.changes, lastInsertRowid: info.lastInsertRowid });
        }
      } catch (err) {
        results.push({ sql: s, error: err.message });
      }
    }

    return { results, elapsed: Date.now() - start };
  });

  // stats for dashboard header
  fastify.get('/admin/api/stats', async (request, reply) => {
    if (!checkAuth(request, reply)) return;

    const total = db.prepare(`SELECT COUNT(*) as n FROM articles`).get().n;
    const withContent = db.prepare(`SELECT COUNT(*) as n FROM articles WHERE content IS NOT NULL AND content != ''`).get().n;
    const withEmbedding = db.prepare(`SELECT COUNT(*) as n FROM articles WHERE has_embedding = 1`).get().n;
    const eventCount = db.prepare(`SELECT COUNT(*) as n FROM events`).get().n;

    const bySource = db.prepare(`
      SELECT source, COUNT(*) as n FROM articles GROUP BY source ORDER BY n DESC
    `).all();

    const byStatus = db.prepare(`
      SELECT COALESCE(content_status, 'null') as status, COUNT(*) as n
      FROM articles GROUP BY content_status ORDER BY n DESC
    `).all();

    return { total, withContent, withEmbedding, eventCount, bySource, byStatus };
  });
}

module.exports = adminRoutes;