import { NextRequest, NextResponse } from 'next/server'
import { searchEntities } from '@/lib/search'

export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url)
    const query = searchParams.get('q')
    const type = searchParams.get('type')
    const limit = parseInt(searchParams.get('limit') || '20')
    const offset = parseInt(searchParams.get('offset') || '0')

    if (!query || query.trim().length === 0) {
      return NextResponse.json(
        { error: 'Search query is required' },
        { status: 400 }
      )
    }

    // Validate parameters
    if (limit < 1 || limit > 100) {
      return NextResponse.json(
        { error: 'Limit must be between 1 and 100' },
        { status: 400 }
      )
    }

    if (offset < 0) {
      return NextResponse.json(
        { error: 'Offset must be non-negative' },
        { status: 400 }
      )
    }

    if (type && !['song', 'album', 'artist', 'playlist'].includes(type)) {
      return NextResponse.json(
        { error: 'Invalid type. Must be one of: song, album, artist, playlist' },
        { status: 400 }
      )
    }

    // Perform search using the search index
    const { results, total } = await searchEntities(
      query.trim(),
      type || undefined,
      limit,
      offset
    )

    // Group results by entity type for easier frontend consumption
    const groupedResults = {
      songs: results.filter(r => r.entityType === 'song').map(r => r.entity),
      albums: results.filter(r => r.entityType === 'album').map(r => r.entity),
      artists: results.filter(r => r.entityType === 'artist').map(r => r.entity),
      playlists: results.filter(r => r.entityType === 'playlist').map(r => r.entity),
    }

    return NextResponse.json(
      {
        query,
        type,
        results: groupedResults,
        total,
        limit,
        offset,
        hasMore: offset + limit < total,
      },
      { status: 200 }
    )
  } catch (error) {
    console.error('Search error:', error)
    return NextResponse.json(
      { error: 'Failed to perform search' },
      { status: 500 }
    )
  }
}