import { NextRequest, NextResponse } from 'next/server';
import { getDb } from '@/lib/db';
import Parser from 'rss-parser';

export const dynamic = 'force-dynamic';

export async function GET() {
    const db = await getDb();
    const feeds = await db.all(`
        SELECT f.*, (SELECT COUNT(*) FROM rss_items WHERE feed_id = f.id) as item_count
        FROM rss_feeds f ORDER BY f.created_at ASC
    `);
    return NextResponse.json(feeds);
}

export async function POST(req: NextRequest) {
    const { url, name } = await req.json();

    if (!url || typeof url !== 'string') {
        return NextResponse.json({ error: 'URL is required' }, { status: 400 });
    }

    // Validate URL format
    try {
        new URL(url);
    } catch {
        return NextResponse.json({ error: 'Invalid URL format' }, { status: 400 });
    }

    // Validate it's actually an RSS feed
    const parser = new Parser({ timeout: 5000 });
    let parsed;
    try {
        parsed = await parser.parseURL(url);
    } catch {
        return NextResponse.json({ error: 'Could not parse RSS feed at this URL' }, { status: 400 });
    }

    const feedName = name?.trim() || parsed.title || new URL(url).hostname;

    const db = await getDb();

    try {
        const result = await db.run(
            'INSERT INTO rss_feeds (name, url) VALUES (?, ?)',
            feedName, url.trim()
        );
        const feedId = result.lastID;

        // Immediately fetch and cache items
        for (const item of parsed.items || []) {
            if (!item.title || !item.link) continue;
            await db.run(
                `INSERT OR IGNORE INTO rss_items (feed_id, title, link, pub_date, creator, snippet)
                 VALUES (?, ?, ?, ?, ?, ?)`,
                feedId,
                item.title,
                item.link,
                item.pubDate || item.isoDate || null,
                item.creator || item.author || null,
                (item.contentSnippet || item.content || '').substring(0, 500) || null
            );
        }

        await db.run(
            'UPDATE rss_feeds SET last_fetched = ? WHERE id = ?',
            new Date().toISOString(), feedId
        );

        const feed = await db.get('SELECT * FROM rss_feeds WHERE id = ?', feedId);
        return NextResponse.json(feed, { status: 201 });
    } catch (err: unknown) {
        if (err instanceof Error && err.message.includes('UNIQUE')) {
            return NextResponse.json({ error: 'Feed URL already exists' }, { status: 409 });
        }
        throw err;
    }
}

export async function DELETE(req: NextRequest) {
    const { id } = await req.json();
    if (!id) {
        return NextResponse.json({ error: 'Feed id is required' }, { status: 400 });
    }

    const db = await getDb();
    await db.run('DELETE FROM rss_items WHERE feed_id = ?', id);
    await db.run('DELETE FROM rss_feeds WHERE id = ?', id);

    return NextResponse.json({ ok: true });
}