import { NextRequest, NextResponse } from 'next/server';
import { db, marketplaceListings } from '@mcpengine/db';
import { eq, ilike, and, desc, count, or, sql } from 'drizzle-orm';

// ── GET /api/marketplace — public listing search ────────────────────────────

export async function GET(req: NextRequest) {
  try {
    const url = new URL(req.url);
    const query = url.searchParams.get('q') || '';
    const category = url.searchParams.get('category') || '';
    const official = url.searchParams.get('official');
    const featured = url.searchParams.get('featured');
    const page = Math.max(1, parseInt(url.searchParams.get('page') || '1', 10));
    const limit = Math.min(50, Math.max(1, parseInt(url.searchParams.get('limit') || '24', 10)));
    const offset = (page - 1) * limit;

    // Build filter conditions — only published listings
    const conditions = [eq(marketplaceListings.status, 'published')];

    if (category) {
      conditions.push(eq(marketplaceListings.category, category));
    }

    if (official === 'true') {
      conditions.push(eq(marketplaceListings.isOfficial, true));
    }

    if (featured === 'true') {
      conditions.push(eq(marketplaceListings.isFeatured, true));
    }

    if (query) {
      conditions.push(
        or(
          ilike(marketplaceListings.name, `%${query}%`),
          ilike(marketplaceListings.description, `%${query}%`),
          ilike(marketplaceListings.slug, `%${query}%`),
        )!,
      );
    }

    const where = and(...conditions);

    const [rows, totalResult] = await Promise.all([
      db
        .select()
        .from(marketplaceListings)
        .where(where)
        .orderBy(
          desc(marketplaceListings.isFeatured),
          desc(marketplaceListings.forkCount),
          desc(marketplaceListings.createdAt),
        )
        .limit(limit)
        .offset(offset),
      db
        .select({ count: count() })
        .from(marketplaceListings)
        .where(where),
    ]);

    const total = totalResult[0]?.count ?? 0;

    // Collect distinct categories for faceting
    const categories = await db
      .selectDistinct({ category: marketplaceListings.category })
      .from(marketplaceListings)
      .where(eq(marketplaceListings.status, 'published'));

    return NextResponse.json({
      data: rows,
      meta: {
        page,
        limit,
        total,
        totalPages: Math.ceil(total / limit),
        categories: categories
          .map((c) => c.category)
          .filter(Boolean)
          .sort(),
      },
    });
  } catch (error) {
    console.error('[GET /api/marketplace]', error);
    return NextResponse.json(
      { error: 'Internal server error' },
      { status: 500 },
    );
  }
}