# app/api/v1/admin/features.py
"""
Admin feature management endpoints.

Provides endpoints for:
- Listing all features with their tier assignments
- Updating tier feature assignments
- Managing feature metadata
- Viewing feature usage statistics
"""

import logging

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel
from sqlalchemy.orm import Session

from app.api.deps import get_current_admin_api
from app.core.database import get_db
from app.services.feature_service import feature_service
from models.schema.auth import UserContext

router = APIRouter(prefix="/features")
logger = logging.getLogger(__name__)


# ============================================================================
# Response Schemas
# ============================================================================


class FeatureResponse(BaseModel):
    """Feature information for admin."""

    id: int
    code: str
    name: str
    description: str | None = None
    category: str
    ui_location: str | None = None
    ui_icon: str | None = None
    ui_route: str | None = None
    ui_badge_text: str | None = None
    minimum_tier_id: int | None = None
    minimum_tier_code: str | None = None
    minimum_tier_name: str | None = None
    is_active: bool
    is_visible: bool
    display_order: int


class FeatureListResponse(BaseModel):
    """List of features."""

    features: list[FeatureResponse]
    total: int


class TierFeaturesResponse(BaseModel):
    """Tier with its features."""

    id: int
    code: str
    name: str
    description: str | None = None
    features: list[str]
    feature_count: int


class TierListWithFeaturesResponse(BaseModel):
    """All tiers with their features."""

    tiers: list[TierFeaturesResponse]


class UpdateTierFeaturesRequest(BaseModel):
    """Request to update tier features."""

    feature_codes: list[str]


class UpdateFeatureRequest(BaseModel):
    """Request to update feature metadata."""

    name: str | None = None
    description: str | None = None
    category: str | None = None
    ui_location: str | None = None
    ui_icon: str | None = None
    ui_route: str | None = None
    ui_badge_text: str | None = None
    minimum_tier_code: str | None = None
    is_active: bool | None = None
    is_visible: bool | None = None
    display_order: int | None = None


class CategoryListResponse(BaseModel):
    """List of feature categories."""

    categories: list[str]


class TierFeatureDetailResponse(BaseModel):
    """Tier features with full details."""

    tier_code: str
    tier_name: str
    features: list[dict]
    feature_count: int


# ============================================================================
# Helper Functions
# ============================================================================


def _feature_to_response(feature) -> FeatureResponse:
    """Convert Feature model to response."""
    return FeatureResponse(
        id=feature.id,
        code=feature.code,
        name=feature.name,
        description=feature.description,
        category=feature.category,
        ui_location=feature.ui_location,
        ui_icon=feature.ui_icon,
        ui_route=feature.ui_route,
        ui_badge_text=feature.ui_badge_text,
        minimum_tier_id=feature.minimum_tier_id,
        minimum_tier_code=feature.minimum_tier.code if feature.minimum_tier else None,
        minimum_tier_name=feature.minimum_tier.name if feature.minimum_tier else None,
        is_active=feature.is_active,
        is_visible=feature.is_visible,
        display_order=feature.display_order,
    )


# ============================================================================
# Endpoints
# ============================================================================


@router.get("", response_model=FeatureListResponse)
def list_features(
    category: str | None = Query(None, description="Filter by category"),
    active_only: bool = Query(False, description="Only active features"),
    current_user: UserContext = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """List all features with their tier assignments."""
    features = feature_service.get_all_features(
        db, category=category, active_only=active_only
    )

    return FeatureListResponse(
        features=[_feature_to_response(f) for f in features],
        total=len(features),
    )


@router.get("/categories", response_model=CategoryListResponse)
def list_categories(
    current_user: UserContext = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """List all feature categories."""
    categories = feature_service.get_categories(db)
    return CategoryListResponse(categories=categories)


@router.get("/tiers", response_model=TierListWithFeaturesResponse)
def list_tiers_with_features(
    current_user: UserContext = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """List all tiers with their feature assignments."""
    tiers = feature_service.get_all_tiers_with_features(db)

    return TierListWithFeaturesResponse(
        tiers=[
            TierFeaturesResponse(
                id=t.id,
                code=t.code,
                name=t.name,
                description=t.description,
                features=t.features or [],
                feature_count=len(t.features or []),
            )
            for t in tiers
        ]
    )


@router.get("/{feature_code}", response_model=FeatureResponse)
def get_feature(
    feature_code: str,
    current_user: UserContext = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """
    Get a single feature by code.

    Raises 404 if feature not found.
    """
    feature = feature_service.get_feature_by_code(db, feature_code)

    if not feature:
        from app.exceptions import FeatureNotFoundError

        raise FeatureNotFoundError(feature_code)

    return _feature_to_response(feature)


@router.put("/{feature_code}", response_model=FeatureResponse)
def update_feature(
    feature_code: str,
    request: UpdateFeatureRequest,
    current_user: UserContext = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """
    Update feature metadata.

    Raises 404 if feature not found, 400 if tier code is invalid.
    """
    feature = feature_service.update_feature(
        db,
        feature_code,
        name=request.name,
        description=request.description,
        category=request.category,
        ui_location=request.ui_location,
        ui_icon=request.ui_icon,
        ui_route=request.ui_route,
        ui_badge_text=request.ui_badge_text,
        minimum_tier_code=request.minimum_tier_code,
        is_active=request.is_active,
        is_visible=request.is_visible,
        display_order=request.display_order,
    )

    db.commit()
    db.refresh(feature)

    logger.info(f"Updated feature {feature_code} by admin {current_user.id}")

    return _feature_to_response(feature)


@router.put("/tiers/{tier_code}/features", response_model=TierFeaturesResponse)
def update_tier_features(
    tier_code: str,
    request: UpdateTierFeaturesRequest,
    current_user: UserContext = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """
    Update features assigned to a tier.

    Raises 404 if tier not found, 422 if any feature codes are invalid.
    """
    tier = feature_service.update_tier_features(db, tier_code, request.feature_codes)
    db.commit()

    logger.info(
        f"Updated tier {tier_code} features to {len(request.feature_codes)} features "
        f"by admin {current_user.id}"
    )

    return TierFeaturesResponse(
        id=tier.id,
        code=tier.code,
        name=tier.name,
        description=tier.description,
        features=tier.features or [],
        feature_count=len(tier.features or []),
    )


@router.get("/tiers/{tier_code}/features", response_model=TierFeatureDetailResponse)
def get_tier_features(
    tier_code: str,
    current_user: UserContext = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """
    Get features assigned to a specific tier with full details.

    Raises 404 if tier not found.
    """
    tier, features = feature_service.get_tier_features_with_details(db, tier_code)

    return TierFeatureDetailResponse(
        tier_code=tier.code,
        tier_name=tier.name,
        features=[
            {
                "code": f.code,
                "name": f.name,
                "category": f.category,
                "description": f.description,
            }
            for f in features
        ],
        feature_count=len(features),
    )