"""
SearchIndexManager Module

Provides index management utilities for Elasticsearch.

For the full implementation, see:
https://github.com/paulkokos/project-management-dashboard/blob/master/backend/projects/search_indexes.py
"""

from typing import Any, Dict, List, Optional


class SearchIndexManager:
    """
    Manager for Elasticsearch index operations.

    This class provides utilities for managing Elasticsearch indexes,
    including index creation, deletion, rebuilding, and optimization.

    Example:
        ```python
        from project_search import SearchIndexManager

        manager = SearchIndexManager()

        # Rebuild all indexes
        manager.rebuild_all_indexes()

        # Get index statistics
        stats = manager.get_index_stats()
        print(f"Total documents indexed: {stats['total_documents']}")

        # Optimize an index
        manager.optimize_index('projects')
        ```
    """

    def rebuild_all_indexes(self) -> Dict[str, Any]:
        """
        Rebuild all search indexes.

        This will clear all existing indexes and re-index all data from the database.
        Use this after schema changes or to fix index corruption.

        Returns:
            Dictionary with rebuild statistics:
                - status: 'success' or 'error'
                - indexes_rebuilt: List of rebuilt index names
                - total_documents: Total documents indexed
                - duration_seconds: Time taken for rebuild

        Raises:
            RuntimeError: If Elasticsearch is unavailable
            ValueError: If index names are invalid

        Note:
            This operation can take significant time for large datasets.
            Consider running during low-traffic periods.

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            result = manager.rebuild_all_indexes()

            if result['status'] == 'success':
                print(f"Rebuilt {len(result['indexes_rebuilt'])} indexes")
                print(f"Indexed {result['total_documents']} documents")
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )

    def rebuild_index(self, index_name: str) -> Dict[str, Any]:
        """
        Rebuild a specific index.

        Args:
            index_name: Name of the index to rebuild
                       ('projects', 'milestones', 'activities', or 'tags')

        Returns:
            Dictionary with rebuild information:
                - index_name: Name of rebuilt index
                - documents_indexed: Number of documents indexed
                - status: 'success' or 'error'

        Raises:
            ValueError: If index name is invalid
            RuntimeError: If Elasticsearch is unavailable

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            result = manager.rebuild_index('projects')
            print(f"Indexed {result['documents_indexed']} projects")
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )

    def optimize_index(self, index_name: str) -> Dict[str, Any]:
        """
        Optimize an index for better performance.

        Performs index optimization including segment merging.
        Use this after bulk indexing operations or large data changes.

        Args:
            index_name: Name of the index to optimize

        Returns:
            Dictionary with optimization results:
                - index_name: Name of optimized index
                - segments_before: Number of segments before optimization
                - segments_after: Number of segments after optimization
                - status: 'success' or 'error'

        Raises:
            ValueError: If index name is invalid
            RuntimeError: If Elasticsearch is unavailable

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            result = manager.optimize_index('projects')
            print(f"Optimized index: {result['segments_after']} segments")
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )

    def delete_index(self, index_name: str) -> Dict[str, Any]:
        """
        Delete an index.

        WARNING: This will permanently delete the index and all its data.
        Use with caution.

        Args:
            index_name: Name of the index to delete

        Returns:
            Dictionary with deletion status:
                - index_name: Name of deleted index
                - status: 'deleted' or 'error'

        Raises:
            ValueError: If index name is invalid or system
            RuntimeError: If Elasticsearch is unavailable

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            # WARNING: This will delete the index!
            result = manager.delete_index('projects')
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )

    def get_index_stats(self) -> Dict[str, Any]:
        """
        Get statistics for all search indexes.

        Returns:
            Dictionary with index statistics:
                - indexes: Dict of index names to their stats
                - total_documents: Total documents across all indexes
                - total_size_bytes: Total index size in bytes
                - health_status: 'green', 'yellow', or 'red'

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            stats = manager.get_index_stats()

            print(f"Total documents: {stats['total_documents']}")
            print(f"Health status: {stats['health_status']}")

            for index_name, index_stats in stats['indexes'].items():
                print(f"{index_name}: {index_stats['document_count']} docs")
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )

    def get_index_mapping(self, index_name: str) -> Dict[str, Any]:
        """
        Get the mapping (schema) for an index.

        Returns the Elasticsearch mapping which defines how documents are indexed.

        Args:
            index_name: Name of the index

        Returns:
            Dictionary with index mapping definition

        Raises:
            ValueError: If index name is invalid
            RuntimeError: If Elasticsearch is unavailable

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            mapping = manager.get_index_mapping('projects')

            # Check field definitions
            for field_name, field_type in mapping['properties'].items():
                print(f"{field_name}: {field_type['type']}")
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )

    def reindex_document(self, doc_id: int, doc_type: str) -> Dict[str, Any]:
        """
        Reindex a single document.

        Args:
            doc_id: ID of the document to reindex
            doc_type: Type of document ('project', 'milestone', 'activity', 'tag')

        Returns:
            Dictionary with reindexing status:
                - doc_id: ID of reindexed document
                - status: 'indexed' or 'error'
                - timestamp: When document was indexed

        Raises:
            ValueError: If doc_type is invalid
            RuntimeError: If Elasticsearch is unavailable or document not found

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            result = manager.reindex_document(doc_id=42, doc_type='project')
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )

    def clear_cache(self) -> Dict[str, Any]:
        """
        Clear Elasticsearch request cache for all indexes.

        Use this after bulk updates or when cache may be stale.

        Returns:
            Dictionary with cache clear status:
                - status: 'success' or 'error'
                - indexes_cleared: List of indexes where cache was cleared

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            result = manager.clear_cache()
            if result['status'] == 'success':
                print("Cache cleared for all indexes")
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )

    def health_check(self) -> Dict[str, Any]:
        """
        Check the health of Elasticsearch and all indexes.

        Returns:
            Dictionary with health information:
                - elasticsearch_status: 'connected' or 'error'
                - indexes: Dict of index names to their health status
                - last_check: Timestamp of last health check
                - issues: List of any issues found

        Example:
            ```python
            from project_search import SearchIndexManager

            manager = SearchIndexManager()
            health = manager.health_check()

            if health['elasticsearch_status'] == 'connected':
                print("Elasticsearch is running")
            else:
                print("Elasticsearch connection failed")
                for issue in health['issues']:
                    print(f"  - {issue}")
            ```
        """
        raise NotImplementedError(
            "This is a stub. Use the full implementation from the main project."
        )
