import { Router } from 'express';
import { requireUser } from '../auth.js';
import { getDb } from '../db/index.js';
import { getStatsMap } from '../stats.js';

export const router = Router();

router.use(requireUser);

router.get('/favorites', (req, res) => {
    const rows = getDb().prepare(`
    SELECT s.*, f.position
    FROM favorites f JOIN stations s ON s.id = f.station_id
    WHERE f.user_id = ? AND s.enabled = 1
    ORDER BY f.position ASC, f.created_at ASC
  `).all(req.user.id);
    const stats = getStatsMap(req.user.id);
    res.json(rows.map((r) => {
        const st = stats.get(r.id) || { up: 0, down: 0, plays: 0, myVote: 0, score: 0 };
        return {
            id: r.id, uuid: r.uuid, name: r.name, slug: r.slug, homepage: r.homepage, country: r.country,
            genres: r.genres ? JSON.parse(r.genres) : [], image_url: r.image_url, category: r.category, position: r.position,
            up: st.up, down: st.down, plays: st.plays, my_vote: st.myVote, score: st.score
        };
    }));
});

// Pick one random favorite. Returns 404 if the user has none.
router.get('/favorites/random', (req, res) => {
    const rows = getDb().prepare(`
    SELECT s.* FROM favorites f JOIN stations s ON s.id = f.station_id
    WHERE f.user_id = ? AND s.enabled = 1
  `).all(req.user.id);
    if (!rows.length) return res.status(404).json({ error: 'no favorites' });
    const r = rows[Math.floor(Math.random() * rows.length)];
    const stats = getStatsMap(req.user.id).get(r.id) || { up: 0, down: 0, plays: 0, myVote: 0, score: 0 };
    res.set('Cache-Control', 'no-store');
    res.json({
        id: r.id, uuid: r.uuid, name: r.name, slug: r.slug, homepage: r.homepage, country: r.country,
        genres: r.genres ? JSON.parse(r.genres) : [], image_url: r.image_url, category: r.category,
        up: stats.up, down: stats.down, plays: stats.plays, my_vote: stats.myVote, score: stats.score
    });
});

router.put('/favorites/:stationId', (req, res) => {
    const stationId = Number(req.params.stationId);
    const position = Number(req.body?.position ?? 0);
    getDb().prepare(`
    INSERT INTO favorites (user_id, station_id, position) VALUES (?, ?, ?)
    ON CONFLICT(user_id, station_id) DO UPDATE SET position = excluded.position
  `).run(req.user.id, stationId, position);
    res.json({ ok: true });
});

router.delete('/favorites/:stationId', (req, res) => {
    getDb().prepare('DELETE FROM favorites WHERE user_id = ? AND station_id = ?')
        .run(req.user.id, Number(req.params.stationId));
    res.json({ ok: true });
});

router.get('/profile', (req, res) => {
    const row = getDb().prepare('SELECT * FROM profiles WHERE user_id = ?').get(req.user.id);
    res.json(row || { user_id: req.user.id, display_name: req.user.username, theme: 'dark', default_volume: 0.7 });
});

router.patch('/profile', (req, res) => {
    const { display_name, theme, default_volume } = req.body || {};
    getDb().prepare(`
    INSERT INTO profiles (user_id, display_name, theme, default_volume) VALUES (?, ?, ?, ?)
    ON CONFLICT(user_id) DO UPDATE SET
      display_name = COALESCE(excluded.display_name, profiles.display_name),
      theme        = COALESCE(excluded.theme,        profiles.theme),
      default_volume = COALESCE(excluded.default_volume, profiles.default_volume)
  `).run(req.user.id, display_name ?? null, theme ?? null, default_volume ?? null);
    res.json({ ok: true });
});

router.get('/history', (req, res) => {
    const rows = getDb().prepare(`
    SELECT h.*, s.name AS station_name, s.slug AS station_slug
    FROM play_history h JOIN stations s ON s.id = h.station_id
    WHERE h.user_id = ?
    ORDER BY h.started_at DESC LIMIT 50
  `).all(req.user.id);
    res.json(rows);
});