"""
XPath/XQuery Paradigm - Path-based data extraction.
"""

import time
from typing import Dict, Any, List, Optional

from ..base import BaseQueryParadigm, QueryResult


class XPathParadigm(BaseQueryParadigm):
    """XPath/XQuery paradigm for path-based data extraction."""

    @property
    def name(self) -> str:
        return "XPath/XQuery"

    @property
    def description(self) -> str:
        return "Path-based data extraction from structured documents using XPath and XQuery syntax"

    @property
    def category(self) -> str:
        return "structural"

    @property
    def complexity(self) -> str:
        return "advanced"

    def execute(self, query: str, config: Dict[str, Any] = None) -> QueryResult:
        """Execute XPath query (not yet implemented)."""
        start_time = time.time()
        execution_time = (time.time() - start_time) * 1000

        return QueryResult(
            paradigm=self.name,
            query=query,
            execution_time_ms=execution_time,
            result_count=0,
            results=[],
            metadata={
                "status": "not_implemented",
                "implementation_issue": "TBD - to be created",
                "description": "XPath enables precise navigation through document structures"
            },
            success=False,
            error_message="XPath/XQuery paradigm not yet implemented."
        )

    def get_examples(self) -> List[Dict[str, str]]:
        """Get example XPath queries."""
        return [
            {
                "name": "Select files by attribute",
                "description": "Find all files with specific author",
                "query": "//file[@author='Alice']"
            },
            {
                "name": "Deep path selection",
                "description": "Select nested content elements",
                "query": "//file/content/section[contains(@title, 'Introduction')]"
            },
            {
                "name": "Conditional selection",
                "description": "Select files with multiple conditions",
                "query": "//file[@type='markdown' and @size > 1000]/tags/tag"
            },
            {
                "name": "Position-based selection",
                "description": "Select first 3 files by creation date",
                "query": "//file[position() <= 3 and @created > '2024-01-01']"
            }
        ]

    def validate_query(self, query: str) -> tuple[bool, Optional[str]]:
        """Validate XPath query syntax."""
        if not query.strip():
            return False, "XPath query cannot be empty"

        if not (query.startswith('//') or query.startswith('/')):
            return False, "XPath query must start with / or //"

        return True, None

    def get_syntax_help(self) -> str:
        """Get syntax help for XPath queries."""
        return """XPath/XQuery Syntax:

Basic Path Selection:
//element - Select all elements anywhere
/root/element - Select from root
element[@attribute='value'] - Select by attribute

Predicates:
//file[@author='Alice'] - Attribute equals
//file[position() <= 3] - Position-based
//file[contains(@tags, 'tutorial')] - Text contains

Functions:
position() - Element position
contains(string, substring) - Text contains
count(elements) - Count elements
text() - Get text content

Document Structure (conceptual):
//file - All files
//file/@author - All author attributes
//file/tags/tag - All tags in files
//file[content/section] - Files with sections

Examples:
//file[@type='markdown']
//file/tags/tag[text()='documentation']
//file[@created > '2024-01-01' and @author='Alice']
"""