"""
Visual Query Builder Paradigm - Drag-and-drop query construction.
"""

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

from ..base import BaseQueryParadigm, QueryResult


class VisualQueryBuilderParadigm(BaseQueryParadigm):
    """Visual query builder paradigm for drag-and-drop query construction."""

    @property
    def name(self) -> str:
        return "Visual Query Builder"

    @property
    def description(self) -> str:
        return "Drag-and-drop interface for building complex queries visually, generates SQL/GraphQL automatically"

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

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

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

        # This is a documentation paradigm - not yet implemented
        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": "Visual query builder provides drag-and-drop interface for constructing complex queries"
            },
            success=False,
            error_message="Visual Query Builder paradigm not yet implemented. This paradigm will provide a web-based drag-and-drop interface."
        )

    def get_examples(self) -> List[Dict[str, str]]:
        """Get example visual query configurations."""
        return [
            {
                "name": "Simple filter",
                "description": "Drag file table, add author filter",
                "query": "{'tables': ['files'], 'filters': [{'field': 'author', 'operator': 'equals', 'value': 'Alice'}]}"
            },
            {
                "name": "Join with aggregation",
                "description": "Join files and tags, count by tag",
                "query": "{'tables': ['files', 'tags'], 'joins': [{'type': 'inner', 'on': 'file_id'}], 'groupBy': ['tag_name'], 'aggregates': [{'function': 'count', 'field': '*'}]}"
            },
            {
                "name": "Date range with sorting",
                "description": "Files created in last month, sorted by date",
                "query": "{'tables': ['files'], 'filters': [{'field': 'created_at', 'operator': 'greater_than', 'value': '30 days ago'}], 'orderBy': [{'field': 'created_at', 'direction': 'desc'}]}"
            },
            {
                "name": "Complex multi-table",
                "description": "Files with tags and author info, filtered by multiple criteria",
                "query": "{'tables': ['files', 'tags', 'authors'], 'joins': [{'type': 'left', 'on': 'file_id'}, {'type': 'inner', 'on': 'author_id'}], 'filters': [{'field': 'tag_name', 'operator': 'in', 'value': ['documentation', 'tutorial']}, {'field': 'author.department', 'operator': 'equals', 'value': 'Engineering'}]}"
            }
        ]

    def validate_query(self, query: str) -> tuple[bool, Optional[str]]:
        """Validate visual query configuration."""
        try:
            import json
            config = json.loads(query)

            if not isinstance(config, dict):
                return False, "Visual query configuration must be a JSON object"

            if 'tables' not in config:
                return False, "Visual query must specify at least one table"

            if not isinstance(config['tables'], list) or len(config['tables']) == 0:
                return False, "Tables must be a non-empty list"

            return True, None
        except json.JSONDecodeError:
            return False, "Visual query configuration must be valid JSON"

    def get_syntax_help(self) -> str:
        """Get syntax help for visual query builder."""
        return """Visual Query Builder Configuration:

The visual query builder uses JSON configuration that represents the visual elements:

Basic Structure:
{
  "tables": ["table1", "table2"],
  "joins": [{"type": "inner|left|right", "on": "field_name"}],
  "filters": [{"field": "field_name", "operator": "equals|contains|greater_than|in", "value": "value"}],
  "groupBy": ["field1", "field2"],
  "aggregates": [{"function": "count|sum|avg|min|max", "field": "field_name"}],
  "orderBy": [{"field": "field_name", "direction": "asc|desc"}],
  "limit": 100
}

Filter Operators:
- equals: Exact match
- contains: Text contains substring
- greater_than, less_than: Numeric/date comparison
- in: Value in list
- between: Value between two values

Aggregate Functions:
- count: Count records
- sum: Sum numeric values
- avg: Average of numeric values
- min/max: Minimum/maximum values

Example:
{
  "tables": ["files"],
  "filters": [
    {"field": "author", "operator": "equals", "value": "Alice"},
    {"field": "created_at", "operator": "greater_than", "value": "2024-01-01"}
  ],
  "orderBy": [{"field": "created_at", "direction": "desc"}]
}
"""