"""
Reporting endpoints - Enterprise report generation.
"""

from fastapi import APIRouter, HTTPException
from app.api.models import ReportRequest, ReportResponse
from app.reporting.enterprise_report import EnterpriseReportGenerator
from pathlib import Path
import structlog

logger = structlog.get_logger(__name__)

router = APIRouter()
report_generator = EnterpriseReportGenerator()


@router.post("/report", response_model=ReportResponse)
async def generate_report(request: ReportRequest):
    """Generate enterprise HTML report."""
    logger.info("report_request", result_id=request.result_id, format=request.format, tier=request.tier)
    
    try:
        # In production, fetch result from cache/database
        # For now, use placeholder data
        result_data = {
            'files_processed': 5,
            'issues_found': 12,
            'fixes_applied': 10,
            'quality_score': 95.0,
            'processing_time_seconds': 2.3,
            'issues': [
                {
                    'issue_type': 'MIXED_DATES',
                    'severity': 'medium',
                    'description': 'Column "date" has mixed date formats',
                    'affected_items': ['date'],
                    'fix_available': True
                }
            ]
        }
        
        schema_data = {
            'version': '1.0.0',
            'columns': {
                'id': {'dtype': 'Int64', 'nullable': False, 'constraints': {'unique': True}},
                'name': {'dtype': 'Utf8', 'nullable': False},
                'email': {'dtype': 'Utf8', 'nullable': True},
                'age': {'dtype': 'Int64', 'nullable': True, 'constraints': {'min_value': 0, 'max_value': 120}}
            }
        }
        
        drift_data = {
            'drift_score': 0.15,
            'missing_columns': {'email': ['file1.csv']},
            'extra_columns': {},
            'type_drifts': {'age': {'file1.csv': 'Utf8', 'file2.csv': 'Int64'}}
        }
        
        lineage_data = {
            'email': [
                {'source_file': 'customers.csv', 'source_column': 'email', 'confidence': 1.0},
                {'source_file': 'users.csv', 'source_column': 'e_mail', 'confidence': 0.9}
            ]
        }
        
        # Generate report
        if request.format == 'html':
            if request.tier == 'pro':
                # Enterprise report
                html = report_generator.generate_report(
                    result_data=result_data,
                    schema_data=schema_data,
                    drift_data=drift_data,
                    lineage_data=lineage_data
                )
                
                # Save to temp file
                output_path = Path.home() / '.datashaper' / 'reports' / f'{request.result_id}.html'
                output_path.parent.mkdir(parents=True, exist_ok=True)
                output_path.write_text(html, encoding='utf-8')
                
                return ReportResponse(
                    report_url=str(output_path),
                    format='html'
                )
            else:
                # Basic report for free tier
                html = "<html><body><h1>Basic Report</h1><p>Upgrade to PRO for enterprise reports</p></body></html>"
                return ReportResponse(
                    report_data={'html': html},
                    format='html'
                )
        else:  # json
            return ReportResponse(
                report_data={
                    'result': result_data,
                    'schema': schema_data,
                    'drift': drift_data
                },
                format='json'
            )
    
    except Exception as e:
        logger.error("report_generation_error", error=str(e))
        raise HTTPException(status_code=500, detail=str(e))
