"""
Package repository for data access operations.
"""

from typing import Optional, List, Tuple
from sqlalchemy.orm import Session
from sqlalchemy import func, or_, asc, desc
from uuid import UUID

from .base import BaseRepository
from ..models import Package, Project, Tag, Upload, Artifact


class PackageRepository(BaseRepository[Package]):
    """Repository for Package entity operations."""

    model = Package

    def get_by_name(self, project_id: UUID, name: str) -> Optional[Package]:
        """Get package by name within a project."""
        return (
            self.db.query(Package)
            .filter(Package.project_id == project_id, Package.name == name)
            .first()
        )

    def get_by_project_and_name(self, project_name: str, package_name: str) -> Optional[Package]:
        """Get package by project name and package name."""
        return (
            self.db.query(Package)
            .join(Project, Package.project_id == Project.id)
            .filter(Project.name == project_name, Package.name == package_name)
            .first()
        )

    def exists_by_name(self, project_id: UUID, name: str) -> bool:
        """Check if package with name exists in project."""
        return self.db.query(
            self.db.query(Package)
            .filter(Package.project_id == project_id, Package.name == name)
            .exists()
        ).scalar()

    def list_by_project(
        self,
        project_id: UUID,
        page: int = 1,
        limit: int = 20,
        search: Optional[str] = None,
        format: Optional[str] = None,
        platform: Optional[str] = None,
        sort: str = "name",
        order: str = "asc",
    ) -> Tuple[List[Package], int]:
        """
        List packages in a project with filtering and pagination.

        Returns tuple of (packages, total_count).
        """
        query = self.db.query(Package).filter(Package.project_id == project_id)

        # Apply search filter
        if search:
            search_lower = search.lower()
            query = query.filter(
                or_(
                    func.lower(Package.name).contains(search_lower),
                    func.lower(Package.description).contains(search_lower)
                )
            )

        # Apply format filter
        if format:
            query = query.filter(Package.format == format)

        # Apply platform filter
        if platform:
            query = query.filter(Package.platform == platform)

        # Get total count
        total = query.count()

        # Apply sorting
        sort_columns = {
            "name": Package.name,
            "created_at": Package.created_at,
            "updated_at": Package.updated_at,
        }
        sort_column = sort_columns.get(sort, Package.name)
        if order == "desc":
            query = query.order_by(desc(sort_column))
        else:
            query = query.order_by(asc(sort_column))

        # Apply pagination
        offset = (page - 1) * limit
        packages = query.offset(offset).limit(limit).all()

        return packages, total

    def create_package(
        self,
        project_id: UUID,
        name: str,
        description: Optional[str] = None,
        format: str = "generic",
        platform: str = "any",
    ) -> Package:
        """Create a new package."""
        return self.create(
            project_id=project_id,
            name=name,
            description=description,
            format=format,
            platform=platform,
        )

    def update_package(
        self,
        package: Package,
        name: Optional[str] = None,
        description: Optional[str] = None,
        format: Optional[str] = None,
        platform: Optional[str] = None,
    ) -> Package:
        """Update package fields."""
        updates = {}
        if name is not None:
            updates["name"] = name
        if description is not None:
            updates["description"] = description
        if format is not None:
            updates["format"] = format
        if platform is not None:
            updates["platform"] = platform
        return self.update(package, **updates)

    def get_stats(self, package_id: UUID) -> dict:
        """Get package statistics (tag count, artifact count, total size)."""
        tag_count = (
            self.db.query(func.count(Tag.id))
            .filter(Tag.package_id == package_id)
            .scalar() or 0
        )

        artifact_stats = (
            self.db.query(
                func.count(func.distinct(Upload.artifact_id)),
                func.coalesce(func.sum(Artifact.size), 0)
            )
            .join(Artifact, Upload.artifact_id == Artifact.id)
            .filter(Upload.package_id == package_id)
            .first()
        )

        return {
            "tag_count": tag_count,
            "artifact_count": artifact_stats[0] if artifact_stats else 0,
            "total_size": artifact_stats[1] if artifact_stats else 0,
        }

    def search(self, query_str: str, limit: int = 10) -> List[Tuple[Package, str]]:
        """Search packages by name or description. Returns (package, project_name) tuples."""
        search_lower = query_str.lower()
        return (
            self.db.query(Package, Project.name)
            .join(Project, Package.project_id == Project.id)
            .filter(
                or_(
                    func.lower(Package.name).contains(search_lower),
                    func.lower(Package.description).contains(search_lower)
                )
            )
            .order_by(Package.name)
            .limit(limit)
            .all()
        )