import { Router, Request, Response } from 'express';
import { addNode, getNode, listNodes, updateNode, removeNode, addEdge, removeEdge, query } from '../core/store';
import { getConnections, buildTree } from '../core/graph';
import { getDb } from '../core/db';
import { determineGroupingStrategy, groupResults } from './queryOrganizer';
import { getLastReport, markDirty, runMaintenance } from './heartbeat';

const router = Router();

function param(req: Request, name: string): string {
  const v = req.params[name];
  return Array.isArray(v) ? v[0] : v;
}

// List nodes
router.get('/nodes', (req: Request, res: Response) => {
  try {
    const options: any = {};
    if (req.query.kind) options.kind = req.query.kind as string;
    if (req.query.status) options.status = req.query.status as string;
    if (req.query.tags) options.tags = (req.query.tags as string).split(',');
    if (req.query.limit) options.limit = parseInt(req.query.limit as string);
    if (req.query.includeStale === 'true') options.includeStale = true;
    const nodes = listNodes(options);
    res.json(nodes.map(n => ({ ...n, embedding: undefined })));
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

// Get single node + connections
router.get('/nodes/:id', (req: Request, res: Response) => {
  try {
    const node = getNode(param(req, 'id'));
    if (!node) return res.status(404).json({ error: 'Node not found' });
    const connections = getConnections(param(req, 'id'));
    res.json({ ...node, embedding: undefined, connections });
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

// Add node
router.post('/nodes', async (req: Request, res: Response) => {
  try {
    const node = await addNode(req.body);
    res.status(201).json({ ...node, embedding: undefined });
  } catch (err: any) {
    res.status(400).json({ error: err.message });
  }
});

// Update node
router.patch('/nodes/:id', async (req: Request, res: Response) => {
  try {
    const node = await updateNode(param(req, 'id'), req.body);
    if (!node) return res.status(404).json({ error: 'Node not found' });
    res.json({ ...node, embedding: undefined });
  } catch (err: any) {
    res.status(400).json({ error: err.message });
  }
});

// Delete node
router.delete('/nodes/:id', (req: Request, res: Response) => {
  try {
    const hard = req.query.hard === 'true';
    const ok = removeNode(param(req, 'id'), hard);
    if (!ok) return res.status(404).json({ error: 'Node not found' });
    res.json({ ok: true });
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

// Add edge
router.post('/edges', (req: Request, res: Response) => {
  try {
    const { fromId, toId, type, metadata } = req.body;
    const edge = addEdge(fromId, toId, type, metadata);
    res.status(201).json(edge);
  } catch (err: any) {
    res.status(400).json({ error: err.message });
  }
});

// Delete edge
router.delete('/edges/:id', (req: Request, res: Response) => {
  try {
    const ok = removeEdge(param(req, 'id'));
    if (!ok) return res.status(404).json({ error: 'Edge not found' });
    res.json({ ok: true });
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

// Graph — returns nodes + edges for React Flow
router.get('/graph', (_req: Request, res: Response) => {
  try {
    const db = getDb();
    const nodes = (db.prepare('SELECT * FROM nodes WHERE is_stale = 0').all() as any[]).map(row => ({
      id: row.id,
      kind: row.kind,
      title: row.title,
      content: row.content,
      status: row.status,
      tags: JSON.parse(row.tags || '[]'),
      metadata: JSON.parse(row.metadata || '{}'),
      createdAt: row.created_at,
      updatedAt: row.updated_at,
    }));
    const edges = (db.prepare('SELECT * FROM edges').all() as any[]).map(row => ({
      id: row.id,
      fromId: row.from_id,
      toId: row.to_id,
      type: row.type,
      metadata: JSON.parse(row.metadata || '{}'),
      createdAt: row.created_at,
    }));
    res.json({ nodes, edges });
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

// Search
router.post('/search', async (req: Request, res: Response) => {
  try {
    const { text, options } = req.body;
    const results = await query(text, options || {});
    res.json(results.map(r => ({ ...r, node: { ...r.node, embedding: undefined } })));
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

// Organized query
router.post('/query/organize', async (req: Request, res: Response) => {
  try {
    const { text } = req.body;
    if (!text) return res.status(400).json({ error: 'text is required' });
    const results = await query(text, { limit: 30 });
    const strategy = determineGroupingStrategy(text);
    const grouped = groupResults(results, strategy);
    res.json(grouped);
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

// Maintenance status
router.get('/maintenance/status', (_req: Request, res: Response) => {
  const report = getLastReport();
  res.json(report || { message: 'No heartbeat has run yet' });
});

// Trigger maintenance manually
router.post('/maintenance/run', async (_req: Request, res: Response) => {
  try {
    markDirty();
    const report = await runMaintenance();
    res.json(report);
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

// Prompt — AI-driven natural language instruction
router.post('/prompt', async (req: Request, res: Response) => {
  try {
    const { prompt } = req.body;
    if (!prompt || typeof prompt !== 'string') {
      return res.status(400).json({ error: 'prompt is required' });
    }
    const { interpretAndExecute } = await import('../core/prompt/interpreter');
    const result = await interpretAndExecute(prompt);
    res.json(result);
  } catch (err: any) {
    res.status(500).json({ error: err.message });
  }
});

export default router;