"""
Compliance repositories — extracted from compliance/db/repository.py.

Phase 1 Step 5: the monolithic repository module is decomposed per
aggregate. Every repository class is re-exported from
``compliance.db.repository`` for backwards compatibility.
"""

import uuid
from datetime import datetime, date, timezone
from typing import List, Optional, Dict, Any, Tuple

from sqlalchemy.orm import Session as DBSession, selectinload, joinedload
from sqlalchemy import func, and_, or_

from compliance.db.models import (
    RegulationDB, RequirementDB, ControlDB, ControlMappingDB,
    EvidenceDB, RiskDB, AuditExportDB,
    AuditSessionDB, AuditSignOffDB, AuditResultEnum, AuditSessionStatusEnum,
    RegulationTypeEnum, ControlDomainEnum, ControlStatusEnum,
    RiskLevelEnum, EvidenceStatusEnum, ExportStatusEnum,
    ServiceModuleDB, ModuleRegulationMappingDB,
)

class RegulationRepository:
    """Repository for regulations/standards."""

    def __init__(self, db: DBSession):
        self.db = db

    def create(
        self,
        code: str,
        name: str,
        regulation_type: RegulationTypeEnum,
        full_name: Optional[str] = None,
        source_url: Optional[str] = None,
        local_pdf_path: Optional[str] = None,
        effective_date: Optional[date] = None,
        description: Optional[str] = None,
    ) -> RegulationDB:
        """Create a new regulation."""
        regulation = RegulationDB(
            id=str(uuid.uuid4()),
            code=code,
            name=name,
            full_name=full_name,
            regulation_type=regulation_type,
            source_url=source_url,
            local_pdf_path=local_pdf_path,
            effective_date=effective_date,
            description=description,
        )
        self.db.add(regulation)
        self.db.commit()
        self.db.refresh(regulation)
        return regulation

    def get_by_id(self, regulation_id: str) -> Optional[RegulationDB]:
        """Get regulation by ID."""
        return self.db.query(RegulationDB).filter(RegulationDB.id == regulation_id).first()

    def get_by_code(self, code: str) -> Optional[RegulationDB]:
        """Get regulation by code (e.g., 'GDPR')."""
        return self.db.query(RegulationDB).filter(RegulationDB.code == code).first()

    def get_all(
        self,
        regulation_type: Optional[RegulationTypeEnum] = None,
        is_active: Optional[bool] = True
    ) -> List[RegulationDB]:
        """Get all regulations with optional filters."""
        query = self.db.query(RegulationDB)
        if regulation_type:
            query = query.filter(RegulationDB.regulation_type == regulation_type)
        if is_active is not None:
            query = query.filter(RegulationDB.is_active == is_active)
        return query.order_by(RegulationDB.code).all()

    def update(self, regulation_id: str, **kwargs) -> Optional[RegulationDB]:
        """Update a regulation."""
        regulation = self.get_by_id(regulation_id)
        if not regulation:
            return None
        for key, value in kwargs.items():
            if hasattr(regulation, key):
                setattr(regulation, key, value)
        regulation.updated_at = datetime.now(timezone.utc)
        self.db.commit()
        self.db.refresh(regulation)
        return regulation

    def delete(self, regulation_id: str) -> bool:
        """Delete a regulation."""
        regulation = self.get_by_id(regulation_id)
        if not regulation:
            return False
        self.db.delete(regulation)
        self.db.commit()
        return True

    def get_active(self) -> List[RegulationDB]:
        """Get all active regulations."""
        return self.get_all(is_active=True)

    def count(self) -> int:
        """Count all regulations."""
        return self.db.query(func.count(RegulationDB.id)).scalar() or 0


class RequirementRepository:
    """Repository for requirements."""

    def __init__(self, db: DBSession):
        self.db = db

    def create(
        self,
        regulation_id: str,
        article: str,
        title: str,
        paragraph: Optional[str] = None,
        description: Optional[str] = None,
        requirement_text: Optional[str] = None,
        breakpilot_interpretation: Optional[str] = None,
        is_applicable: bool = True,
        priority: int = 2,
    ) -> RequirementDB:
        """Create a new requirement."""
        requirement = RequirementDB(
            id=str(uuid.uuid4()),
            regulation_id=regulation_id,
            article=article,
            paragraph=paragraph,
            title=title,
            description=description,
            requirement_text=requirement_text,
            breakpilot_interpretation=breakpilot_interpretation,
            is_applicable=is_applicable,
            priority=priority,
        )
        self.db.add(requirement)
        self.db.commit()
        self.db.refresh(requirement)
        return requirement

    def get_by_id(self, requirement_id: str) -> Optional[RequirementDB]:
        """Get requirement by ID with eager-loaded relationships."""
        return (
            self.db.query(RequirementDB)
            .options(
                selectinload(RequirementDB.control_mappings).selectinload(ControlMappingDB.control),
                joinedload(RequirementDB.regulation)
            )
            .filter(RequirementDB.id == requirement_id)
            .first()
        )

    def get_by_regulation(
        self,
        regulation_id: str,
        is_applicable: Optional[bool] = None
    ) -> List[RequirementDB]:
        """Get all requirements for a regulation with eager-loaded controls."""
        query = (
            self.db.query(RequirementDB)
            .options(
                selectinload(RequirementDB.control_mappings).selectinload(ControlMappingDB.control),
                joinedload(RequirementDB.regulation)
            )
            .filter(RequirementDB.regulation_id == regulation_id)
        )
        if is_applicable is not None:
            query = query.filter(RequirementDB.is_applicable == is_applicable)
        return query.order_by(RequirementDB.article, RequirementDB.paragraph).all()

    def get_by_regulation_code(self, code: str) -> List[RequirementDB]:
        """Get requirements by regulation code with eager-loaded relationships."""
        return (
            self.db.query(RequirementDB)
            .options(
                selectinload(RequirementDB.control_mappings).selectinload(ControlMappingDB.control),
                joinedload(RequirementDB.regulation)
            )
            .join(RegulationDB)
            .filter(RegulationDB.code == code)
            .order_by(RequirementDB.article, RequirementDB.paragraph)
            .all()
        )

    def get_all(self, is_applicable: Optional[bool] = None) -> List[RequirementDB]:
        """Get all requirements with optional filter and eager-loading."""
        query = (
            self.db.query(RequirementDB)
            .options(
                selectinload(RequirementDB.control_mappings).selectinload(ControlMappingDB.control),
                joinedload(RequirementDB.regulation)
            )
        )
        if is_applicable is not None:
            query = query.filter(RequirementDB.is_applicable == is_applicable)
        return query.order_by(RequirementDB.article, RequirementDB.paragraph).all()

    def get_paginated(
        self,
        page: int = 1,
        page_size: int = 50,
        regulation_code: Optional[str] = None,
        status: Optional[str] = None,
        is_applicable: Optional[bool] = None,
        search: Optional[str] = None,
    ) -> Tuple[List[RequirementDB], int]:
        """
        Get paginated requirements with eager-loaded relationships.
        Returns tuple of (items, total_count).
        """
        query = (
            self.db.query(RequirementDB)
            .options(
                selectinload(RequirementDB.control_mappings).selectinload(ControlMappingDB.control),
                joinedload(RequirementDB.regulation)
            )
        )

        # Filters
        if regulation_code:
            query = query.join(RegulationDB).filter(RegulationDB.code == regulation_code)
        if status:
            query = query.filter(RequirementDB.implementation_status == status)
        if is_applicable is not None:
            query = query.filter(RequirementDB.is_applicable == is_applicable)
        if search:
            search_term = f"%{search}%"
            query = query.filter(
                or_(
                    RequirementDB.title.ilike(search_term),
                    RequirementDB.description.ilike(search_term),
                    RequirementDB.article.ilike(search_term),
                )
            )

        # Count before pagination
        total = query.count()

        # Apply pagination and ordering
        items = (
            query
            .order_by(RequirementDB.priority.desc(), RequirementDB.article, RequirementDB.paragraph)
            .offset((page - 1) * page_size)
            .limit(page_size)
            .all()
        )

        return items, total

    def delete(self, requirement_id: str) -> bool:
        """Delete a requirement."""
        requirement = self.db.query(RequirementDB).filter(RequirementDB.id == requirement_id).first()
        if not requirement:
            return False
        self.db.delete(requirement)
        self.db.commit()
        return True

    def count(self) -> int:
        """Count all requirements."""
        return self.db.query(func.count(RequirementDB.id)).scalar() or 0