import argparse
import sys
from pathlib import Path
import tempfile
import numpy as np
from typing import Final

import db

DEFAULT_DB_PATH: Final[Path] = Path("db.pkl")


def test_database():
    """Test database save/load functionality by creating, saving, loading and comparing."""
    print("=== Database Test ===")

    # Create dummy database
    print("1. Creating dummy database...")
    original_db = db.create_dummy()
    print(
        f"   Original DB: {len(original_db.vectors)} vectors, {len(original_db.records)} records"
    )

    # Print some details about the original database
    print(
        "   First vector shape:",
        original_db.vectors[0].shape if original_db.vectors else "No vectors",
    )
    print(
        "   Sample vector:",
        original_db.vectors[0][:4] if original_db.vectors else "No vectors",
    )
    print("   Sample record keys (first 3):", list(original_db.records.keys())[:3])

    # Create temporary file for testing
    with tempfile.NamedTemporaryFile(suffix=".pkl", delete=False) as tmp_file:
        test_file = Path(tmp_file.name)

    try:
        # Save database
        print(f"\n2. Saving database to {test_file}...")
        db.save(original_db, test_file)
        print(f"   File size: {test_file.stat().st_size} bytes")

        # Load database
        print(f"\n3. Loading database from {test_file}...")
        loaded_db = db.load(test_file)
        print(
            f"   Loaded DB: {len(loaded_db.vectors)} vectors, {len(loaded_db.records)} records"
        )

        # Compare databases
        print("\n4. Comparing original vs loaded...")

        # Check vector count
        vectors_match = len(original_db.vectors) == len(loaded_db.vectors)
        print(f"   Vector count match: {vectors_match}")

        # Check record count
        records_match = len(original_db.records) == len(loaded_db.records)
        print(f"   Record count match: {records_match}")

        # Check vector equality
        vectors_equal = True
        if vectors_match and original_db.vectors:
            for i, (orig, loaded) in enumerate(
                zip(original_db.vectors, loaded_db.vectors)
            ):
                if not np.array_equal(orig, loaded):
                    vectors_equal = False
                    print(f"   Vector {i} mismatch!")
                    break
        print(f"   All vectors equal: {vectors_equal}")

        # Check record equality
        records_equal = True
        if records_match:
            for key in original_db.records:
                if key not in loaded_db.records:
                    records_equal = False
                    print("   Missing record key!")
                    break
                if original_db.records[key] != loaded_db.records[key]:
                    records_equal = False
                    print("   Record content mismatch!")
                    break
        print(f"   All records equal: {records_equal}")

        # Test embedding functionality
        print("\n5. Testing embedding functionality (Ollama API server)...")
        try:
            test_embedding = db._embed("This is a test text for embedding.")
            print(
                f"   Embedding test PASSED: Generated vector of shape {test_embedding.shape}"
            )
            ollama_running = True
        except Exception as e:
            print(
                f"   Embedding test FAILED: {e}\n   Did you start ollama docker image?"
            )
            ollama_running = False

        # Summary
        all_good = (
            vectors_match
            and records_match
            and vectors_equal
            and records_equal
            and ollama_running
        )
        print(f"\n✅ Test {'PASSED' if all_good else 'FAILED'}")

    finally:
        # Clean up temporary file
        if test_file.exists():
            test_file.unlink()
            print(f"   Cleaned up temporary file: {test_file}")


def create_database(db_path: str):
    """Create a new empty database."""
    db_file = Path(db_path)

    # Check if file already exists
    if db_file.exists():
        response = input(f"Database {db_file} already exists. Overwrite? (y/N): ")
        if response.lower() != "y":
            print("Operation cancelled.")
            return

    # Create empty database
    empty_db = db.create_empty()

    # Save to file
    db.save(empty_db, db_file)

    print(f"✅ Created empty database: {db_file}")
    print(f"   Vectors: {len(empty_db.vectors)}")
    print(f"   Records: {len(empty_db.records)}")


def add_file(db_path: str, file_paths: list[str]):
    """Add one or more files to the semantic search database."""
    print(f"Adding {len(file_paths)} file(s) to database: {db_path}")

    db_file = Path(db_path)
    successful_files = []
    failed_files = []

    for i, file_path in enumerate(file_paths, 1):
        print(f"\n[{i}/{len(file_paths)}] Processing: {file_path}")
        try:
            db.add_document(db_file, Path(file_path))
            successful_files.append(file_path)
            print(f"✅ Successfully added: {file_path}")
        except Exception as e:
            failed_files.append((file_path, str(e)))
            print(f"❌ Failed to add {file_path}: {e}")

    # Summary
    print(f"\n{'='*60}")
    print("SUMMARY:")
    print(f"✅ Successfully added: {len(successful_files)} files")
    if successful_files:
        for file_path in successful_files:
            print(f"   - {Path(file_path).name}")

    if failed_files:
        print(f"❌ Failed to add: {len(failed_files)} files")
        for file_path, error in failed_files:
            print(f"   - {Path(file_path).name}: {error}")

    print(f"{'='*60}")


def query(db_path: str, query_text: str):
    """Query the semantic search database."""
    print(f"Querying: '{query_text}' in database: {db_path}")

    try:
        results = db.query(Path(db_path), query_text)

        if not results:
            print("No results found.")
            return

        print(f"\nFound {len(results)} results:")
        print("=" * 60)

        for i, res in enumerate(results, 1):
            print(f"\n{i}. Distance: {res.distance:.4f}")
            print(f"   Document: {res.document_name}")
            print(f"   Page: {res.record.page}, Chunk: {res.record.chunk}")
            # Replace all whitespace characters with regular spaces for cleaner display
            clean_text = " ".join(res.record.text[:200].split())
            print(f"   Text preview: {clean_text}...")
            if i < len(results):
                print("-" * 40)

    except Exception as e:
        print(f"Error querying database: {e}")


def start_web_server(db_path: str, host: str = "127.0.0.1", port: int = 5000):
    """Start a web server for the semantic search tool."""
    try:
        from flask import Flask, request, jsonify, render_template, send_file
    except ImportError:
        print("❌ Flask not found. Please install it first:")
        print("   pip install flask")
        sys.exit(1)
    # Set template_folder to 'templates' directory
    app = Flask(__name__, template_folder="templates")
    db_file = Path(db_path)

    # Check if database exists
    if not db_file.exists():
        print(f"❌ Database file not found: {db_file}")
        print("   Create a database first using: python main.py create")
        sys.exit(1)

    @app.route("/")
    def index():
        return render_template("index.html", results=None)

    @app.route("/file/<int:document_index>")
    def serve_file(document_index):
        """Serve PDF files directly."""
        try:
            file_path = db.get_document_path(db_file, document_index)
            if not file_path.exists():
                return jsonify({"error": "File not found"}), 404
            return send_file(file_path, as_attachment=False)
        except Exception as e:
            return jsonify({"error": str(e)}), 500

    @app.route("/api/search", methods=["POST"])
    def search():
        try:
            data = request.get_json()
            if not data or "query" not in data:
                return jsonify({"error": "Missing query parameter"}), 400

            query_text = data["query"].strip()
            if not query_text:
                return jsonify({"error": "Query cannot be empty"}), 400

            # Perform the search
            results = db.query(db_file, query_text)

            # Format results for JSON response
            formatted_results = []
            for res in results:
                formatted_results.append(
                    {
                        "distance": float(res.distance),
                        "document_name": res.document_name,
                        "document_index": res.record.document_index,
                        "page": res.record.page,
                        "chunk": res.record.chunk,
                        "text": " ".join(
                            res.record.text[:300].split()
                        ),  # Clean and truncate text
                    }
                )
            return jsonify({"results": formatted_results})

        except Exception as e:
            return jsonify({"error": str(e)}), 500

    print("🚀 Starting web server...")
    print(f"   Database: {db_file}")
    print(f"   URL: http://{host}:{port}")
    print("   Press Ctrl+C to stop")

    try:
        app.run(host=host, port=port, debug=False)
    except KeyboardInterrupt:
        print("\n👋 Web server stopped")
    except Exception as e:
        print(f"❌ Error starting web server: {e}")


def main():
    parser = argparse.ArgumentParser(
        description="Semantic Search Tool",
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )

    # Create subparsers for different commands
    subparsers = parser.add_subparsers(dest="command", help="Available commands")

    # Create command
    create_parser = subparsers.add_parser(
        "create", aliases=["c"], help="Create a new empty database"
    )
    create_parser.add_argument(
        "db_path",
        nargs="?",
        default=str(DEFAULT_DB_PATH),
        help=f"Path to database file (default: {DEFAULT_DB_PATH})",
    )

    # Add file command
    add_parser = subparsers.add_parser(
        "add-file", aliases=["a"], help="Add one or more files to the search database"
    )
    add_parser.add_argument("db", help="Path to the database file (e.g., db.pkl)")
    add_parser.add_argument(
        "file_paths", nargs="+", help="Path(s) to the PDF file(s) to add"
    )

    # Query command
    query_parser = subparsers.add_parser(
        "query", aliases=["q"], help="Query the search database"
    )
    query_parser.add_argument("db", help="Path to the database file (e.g., db.pkl)")
    query_parser.add_argument("query_text", help="Text to search for")

    # Host command (web server)
    host_parser = subparsers.add_parser(
        "host", aliases=["h"], help="Start a web server for semantic search"
    )
    host_parser.add_argument("db", help="Path to the database file (e.g., db.pkl)")
    host_parser.add_argument(
        "--host",
        default="127.0.0.1",
        help="Host address to bind to (default: 127.0.0.1)",
    )
    host_parser.add_argument(
        "--port", type=int, default=5000, help="Port to listen on (default: 5000)"
    )

    # Test command
    subparsers.add_parser(
        "test", aliases=["t"], help="Test database save/load functionality"
    )

    # Parse arguments
    args = parser.parse_args()

    # Handle commands
    if args.command in ["create", "c"]:
        create_database(args.db_path)
    elif args.command in ["add-file", "a"]:
        add_file(args.db, args.file_paths)
    elif args.command in ["query", "q"]:
        query(args.db, args.query_text)
    elif args.command in ["host", "h"]:
        start_web_server(args.db, args.host, args.port)
    elif args.command in ["test", "t"]:
        test_database()
    else:
        parser.print_help()
        sys.exit(1)


if __name__ == "__main__":
    main()