# app/modules/tenancy/services/tenancy_features.py
"""
Tenancy feature provider for the billing feature system.

Declares tenancy-related billable features (team member limits, role-based access)
and provides usage tracking queries for feature gating. The team_members feature
tracks how many active users a merchant has across their stores on a platform.
"""

from __future__ import annotations

import logging
from typing import TYPE_CHECKING

from sqlalchemy import func

from app.modules.contracts.features import (
    FeatureDeclaration,
    FeatureScope,
    FeatureType,
    FeatureUsage,
)

if TYPE_CHECKING:
    from sqlalchemy.orm import Session

logger = logging.getLogger(__name__)


class TenancyFeatureProvider:
    """Feature provider for the tenancy module.

    Declares:
    - team_members: quantitative merchant-level limit on active team members
    - single_user: binary merchant-level feature for single-user mode
    - team_basic: binary merchant-level feature for basic team support
    - team_roles: binary merchant-level feature for role-based access
    - audit_log: binary merchant-level feature for audit logging
    """

    @property
    def feature_category(self) -> str:
        return "tenancy"

    def get_feature_declarations(self) -> list[FeatureDeclaration]:
        return [
            FeatureDeclaration(
                code="team_members",
                name_key="tenancy.features.team_members.name",
                description_key="tenancy.features.team_members.description",
                category="tenancy",
                feature_type=FeatureType.QUANTITATIVE,
                scope=FeatureScope.MERCHANT,
                default_limit=1,
                unit_key="tenancy.features.team_members.unit",
                ui_icon="users",
                display_order=10,
            ),
            FeatureDeclaration(
                code="single_user",
                name_key="tenancy.features.single_user.name",
                description_key="tenancy.features.single_user.description",
                category="tenancy",
                feature_type=FeatureType.BINARY,
                scope=FeatureScope.MERCHANT,
                ui_icon="user",
                display_order=20,
            ),
            FeatureDeclaration(
                code="team_basic",
                name_key="tenancy.features.team_basic.name",
                description_key="tenancy.features.team_basic.description",
                category="tenancy",
                feature_type=FeatureType.BINARY,
                scope=FeatureScope.MERCHANT,
                ui_icon="user-plus",
                display_order=30,
            ),
            FeatureDeclaration(
                code="team_roles",
                name_key="tenancy.features.team_roles.name",
                description_key="tenancy.features.team_roles.description",
                category="tenancy",
                feature_type=FeatureType.BINARY,
                scope=FeatureScope.MERCHANT,
                ui_icon="shield",
                display_order=40,
            ),
            FeatureDeclaration(
                code="audit_log",
                name_key="tenancy.features.audit_log.name",
                description_key="tenancy.features.audit_log.description",
                category="tenancy",
                feature_type=FeatureType.BINARY,
                scope=FeatureScope.MERCHANT,
                ui_icon="clipboard-list",
                display_order=50,
            ),
        ]

    def get_store_usage(
        self,
        db: Session,
        store_id: int,
    ) -> list[FeatureUsage]:
        # team_members is MERCHANT-scoped, not applicable at store level
        return []

    def get_merchant_usage(
        self,
        db: Session,
        merchant_id: int,
        platform_id: int,
    ) -> list[FeatureUsage]:
        from app.modules.tenancy.models.store import Store, StoreUser
        from app.modules.tenancy.models.store_platform import StorePlatform
        from app.modules.tenancy.models.user import User

        # Count active users associated with stores owned by this merchant
        count = (
            db.query(func.count(func.distinct(User.id)))
            .join(StoreUser, User.id == StoreUser.user_id)
            .join(Store, StoreUser.store_id == Store.id)
            .join(StorePlatform, Store.id == StorePlatform.store_id)
            .filter(
                Store.merchant_id == merchant_id,
                StorePlatform.platform_id == platform_id,
                User.is_active == True,  # noqa: E712
            )
            .scalar()
            or 0
        )
        return [
            FeatureUsage(
                feature_code="team_members",
                current_count=count,
                label="Team members",
            ),
        ]


# Singleton instance for module registration
tenancy_feature_provider = TenancyFeatureProvider()

__all__ = [
    "TenancyFeatureProvider",
    "tenancy_feature_provider",
]