#!/usr/bin/env python3
  """
  Main entry point for SearchEngine operations.
  
  Provides a unified CLI for common operations:
  - ingest: Ingest data into Elasticsearch
  - serve: Start API service
  - search: Test search from command line
  """
  
  import sys
  import os
  import argparse
  import json

  import pandas as pd
  import uvicorn

  
  # Add parent directory to path
  sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
  

  from config import ConfigLoader
  from utils import ESClient
  from indexer import DataTransformer, IndexingPipeline
  from embeddings import BgeEncoder, CLIPImageEncoder
  from search import Searcher
  

  
  def cmd_ingest(args):
      """Run data ingestion."""

      print("Starting data ingestion")

  
      # Load config

      config_loader = ConfigLoader("config/config.yaml")
      config = config_loader.load_config()

  
      # Initialize ES
      es_client = ESClient(hosts=[args.es_host])
      if not es_client.ping():
          print(f"ERROR: Cannot connect to Elasticsearch at {args.es_host}")
          return 1
  
      # Load data
      df = pd.read_csv(args.csv_file)
      if args.limit:
          df = df.head(args.limit)
      print(f"Loaded {len(df)} documents")
  
      # Initialize encoders
      text_encoder = None if args.skip_embeddings else BgeEncoder()
      image_encoder = None if args.skip_embeddings else CLIPImageEncoder()
  
      # Transform and index
      transformer = DataTransformer(config, text_encoder, image_encoder, use_cache=True)
      pipeline = IndexingPipeline(config, es_client, transformer, recreate_index=args.recreate)
  
      results = pipeline.run(df, batch_size=args.batch_size)
  
      print(f"\nIngestion complete:")
      print(f"  Success: {results['success']}")
      print(f"  Failed: {results['failed']}")
      print(f"  Time: {results['elapsed_time']:.2f}s")
  
      return 0
  
  
  def cmd_serve(args):
      """Start API service."""

      os.environ['ES_HOST'] = args.es_host
  

      print("Starting API service (multi-tenant)...")

      print(f"  Host: {args.host}:{args.port}")
      print(f"  Elasticsearch: {args.es_host}")
  
      uvicorn.run(
          "api.app:app",
          host=args.host,
          port=args.port,
          reload=args.reload
      )
  
  
  def cmd_search(args):
      """Test search from command line."""

      # Load config

      config_loader = ConfigLoader("config/config.yaml")
      config = config_loader.load_config()

  
      # Initialize ES and searcher
      es_client = ESClient(hosts=[args.es_host])
      if not es_client.ping():
          print(f"ERROR: Cannot connect to Elasticsearch at {args.es_host}")
          return 1
  

      from query import QueryParser
      query_parser = QueryParser(config)

      searcher = Searcher(es_client, config, query_parser)

  
      # Execute search

      print(f"Searching for: '{args.query}' (tenant: {args.tenant_id})")

      result = searcher.search(
          query=args.query,

          tenant_id=args.tenant_id,
          size=args.size

      )
  
      # Display results
      print(f"\nFound {result.total} results in {result.took_ms}ms")
      print(f"Max score: {result.max_score}")
  
      if args.json:
          print(json.dumps(result.to_dict(), indent=2, ensure_ascii=False))
      else:
          print(f"\nTop {len(result.hits)} results:")
          for i, hit in enumerate(result.hits, 1):
              source = hit['_source']
              score = hit['_score']
              print(f"\n{i}. Score: {score:.4f}")
              print(f"   ID: {source.get('skuId', 'N/A')}")
              print(f"   Name: {source.get('name', 'N/A')}")
              print(f"   Category: {source.get('categoryName', 'N/A')}")
              print(f"   Brand: {source.get('brandName', 'N/A')}")
  
      return 0
  
  
  def main():
      """Main CLI entry point."""
      parser = argparse.ArgumentParser(
          description='SearchEngine - E-Commerce Search SaaS',
          formatter_class=argparse.RawDescriptionHelpFormatter
      )
  
      subparsers = parser.add_subparsers(dest='command', help='Command to execute')
  
      # Ingest command
      ingest_parser = subparsers.add_parser('ingest', help='Ingest data into Elasticsearch')
      ingest_parser.add_argument('csv_file', help='Path to CSV data file')

      ingest_parser.add_argument('--es-host', default='http://localhost:9200', help='Elasticsearch host')
      ingest_parser.add_argument('--limit', type=int, help='Limit number of documents')
      ingest_parser.add_argument('--batch-size', type=int, default=100, help='Batch size')
      ingest_parser.add_argument('--recreate', action='store_true', help='Recreate index')
      ingest_parser.add_argument('--skip-embeddings', action='store_true', help='Skip embeddings')
  
      # Serve command

      serve_parser = subparsers.add_parser('serve', help='Start API service (multi-tenant)')

      serve_parser.add_argument('--host', default='0.0.0.0', help='Host to bind to')

      serve_parser.add_argument('--port', type=int, default=6002, help='Port to bind to')

      serve_parser.add_argument('--es-host', default='http://localhost:9200', help='Elasticsearch host')
      serve_parser.add_argument('--reload', action='store_true', help='Enable auto-reload')
  
      # Search command
      search_parser = subparsers.add_parser('search', help='Test search from command line')
      search_parser.add_argument('query', help='Search query')

      search_parser.add_argument('--tenant-id', required=True, help='Tenant ID (required)')

      search_parser.add_argument('--es-host', default='http://localhost:9200', help='Elasticsearch host')
      search_parser.add_argument('--size', type=int, default=10, help='Number of results')
      search_parser.add_argument('--no-translation', action='store_true', help='Disable translation')
      search_parser.add_argument('--no-embedding', action='store_true', help='Disable embeddings')
      search_parser.add_argument('--json', action='store_true', help='Output JSON')
  
      args = parser.parse_args()
  
      if not args.command:
          parser.print_help()
          return 1
  
      # Execute command
      if args.command == 'ingest':
          return cmd_ingest(args)
      elif args.command == 'serve':
          return cmd_serve(args)
      elif args.command == 'search':
          return cmd_search(args)
      else:
          print(f"Unknown command: {args.command}")
          return 1
  
  
  if __name__ == "__main__":
      sys.exit(main())