# app/api/v1/vendor/features.py
"""
Vendor features API endpoints.

Provides feature availability information for the frontend to:
- Show/hide UI elements based on tier
- Display upgrade prompts for unavailable features
- Load feature metadata for dynamic rendering

Endpoints:
- GET /features/available - List of feature codes (for quick checks)
- GET /features - Full feature list with availability and metadata
- GET /features/{code} - Single feature details with upgrade info
- GET /features/categories - List feature categories
"""

import logging

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

from app.api.deps import get_current_vendor_api
from app.core.database import get_db
from app.exceptions import FeatureNotFoundError
from app.services.feature_service import feature_service
from models.database.user import User

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


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


class FeatureCodeListResponse(BaseModel):
    """Simple list of available feature codes for quick checks."""

    features: list[str]
    tier_code: str
    tier_name: str


class FeatureResponse(BaseModel):
    """Full feature information."""

    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
    is_available: bool
    minimum_tier_code: str | None = None
    minimum_tier_name: str | None = None


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

    features: list[FeatureResponse]
    available_count: int
    total_count: int
    tier_code: str
    tier_name: str


class FeatureDetailResponse(BaseModel):
    """Single feature detail with upgrade info."""

    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
    is_available: bool
    # Upgrade info (only if not available)
    upgrade_tier_code: str | None = None
    upgrade_tier_name: str | None = None
    upgrade_tier_price_monthly_cents: int | None = None


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

    categories: list[str]


class FeatureGroupedResponse(BaseModel):
    """Features grouped by category."""

    categories: dict[str, list[FeatureResponse]]
    available_count: int
    total_count: int


class FeatureCheckResponse(BaseModel):
    """Quick feature availability check response."""

    has_feature: bool
    feature_code: str


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


@router.get("/available", response_model=FeatureCodeListResponse)
def get_available_features(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Get list of feature codes available to vendor.

    This is a lightweight endpoint for quick feature checks.
    Use this to populate a frontend feature store on app init.

    Returns:
        List of feature codes the vendor has access to
    """
    vendor_id = current_user.token_vendor_id

    # Get subscription for tier info
    from app.services.subscription_service import subscription_service

    subscription = subscription_service.get_or_create_subscription(db, vendor_id)
    tier = subscription.tier_obj

    # Get available features
    feature_codes = feature_service.get_available_feature_codes(db, vendor_id)

    return FeatureCodeListResponse(
        features=feature_codes,
        tier_code=subscription.tier,
        tier_name=tier.name if tier else subscription.tier.title(),
    )


@router.get("", response_model=FeatureListResponse)
def get_features(
    category: str | None = Query(None, description="Filter by category"),
    include_unavailable: bool = Query(True, description="Include features not available to vendor"),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Get all features with availability status and metadata.

    This is a comprehensive endpoint for building feature-gated UIs.
    Each feature includes:
    - Availability status
    - UI metadata (icon, route, location)
    - Minimum tier required

    Args:
        category: Filter to specific category (orders, inventory, etc.)
        include_unavailable: Whether to include locked features

    Returns:
        List of features with metadata and availability
    """
    vendor_id = current_user.token_vendor_id

    # Get subscription for tier info
    from app.services.subscription_service import subscription_service

    subscription = subscription_service.get_or_create_subscription(db, vendor_id)
    tier = subscription.tier_obj

    # Get features
    features = feature_service.get_vendor_features(
        db,
        vendor_id,
        category=category,
        include_unavailable=include_unavailable,
    )

    available_count = sum(1 for f in features if f.is_available)

    return FeatureListResponse(
        features=[
            FeatureResponse(
                code=f.code,
                name=f.name,
                description=f.description,
                category=f.category,
                ui_location=f.ui_location,
                ui_icon=f.ui_icon,
                ui_route=f.ui_route,
                ui_badge_text=f.ui_badge_text,
                is_available=f.is_available,
                minimum_tier_code=f.minimum_tier_code,
                minimum_tier_name=f.minimum_tier_name,
            )
            for f in features
        ],
        available_count=available_count,
        total_count=len(features),
        tier_code=subscription.tier,
        tier_name=tier.name if tier else subscription.tier.title(),
    )


@router.get("/categories", response_model=CategoryListResponse)
def get_feature_categories(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Get list of feature categories.

    Returns:
        List of category names
    """
    categories = feature_service.get_categories(db)
    return CategoryListResponse(categories=categories)


@router.get("/grouped", response_model=FeatureGroupedResponse)
def get_features_grouped(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Get features grouped by category.

    Useful for rendering feature comparison tables or settings pages.
    """
    vendor_id = current_user.token_vendor_id

    grouped = feature_service.get_features_grouped_by_category(db, vendor_id)

    # Convert to response format
    categories_response = {}
    total = 0
    available = 0

    for category, features in grouped.items():
        categories_response[category] = [
            FeatureResponse(
                code=f.code,
                name=f.name,
                description=f.description,
                category=f.category,
                ui_location=f.ui_location,
                ui_icon=f.ui_icon,
                ui_route=f.ui_route,
                ui_badge_text=f.ui_badge_text,
                is_available=f.is_available,
                minimum_tier_code=f.minimum_tier_code,
                minimum_tier_name=f.minimum_tier_name,
            )
            for f in features
        ]
        total += len(features)
        available += sum(1 for f in features if f.is_available)

    return FeatureGroupedResponse(
        categories=categories_response,
        available_count=available,
        total_count=total,
    )


@router.get("/{feature_code}", response_model=FeatureDetailResponse)
def get_feature_detail(
    feature_code: str,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Get detailed information about a specific feature.

    Includes upgrade information if the feature is not available.
    Use this for upgrade prompts and feature explanation modals.

    Args:
        feature_code: The feature code

    Returns:
        Feature details with upgrade info if locked
    """
    vendor_id = current_user.token_vendor_id

    # Get feature
    feature = feature_service.get_feature_by_code(db, feature_code)
    if not feature:
        raise FeatureNotFoundError(feature_code)

    # Check availability
    is_available = feature_service.has_feature(db, vendor_id, feature_code)

    # Get upgrade info if not available
    upgrade_tier_code = None
    upgrade_tier_name = None
    upgrade_tier_price = None

    if not is_available:
        upgrade_info = feature_service.get_feature_upgrade_info(db, feature_code)
        if upgrade_info:
            upgrade_tier_code = upgrade_info.required_tier_code
            upgrade_tier_name = upgrade_info.required_tier_name
            upgrade_tier_price = upgrade_info.required_tier_price_monthly_cents

    return FeatureDetailResponse(
        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,
        is_available=is_available,
        upgrade_tier_code=upgrade_tier_code,
        upgrade_tier_name=upgrade_tier_name,
        upgrade_tier_price_monthly_cents=upgrade_tier_price,
    )


@router.get("/check/{feature_code}", response_model=FeatureCheckResponse)
def check_feature(
    feature_code: str,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """
    Quick check if vendor has access to a feature.

    Returns simple boolean response for inline checks.

    Args:
        feature_code: The feature code

    Returns:
        has_feature and feature_code
    """
    vendor_id = current_user.token_vendor_id
    has_feature = feature_service.has_feature(db, vendor_id, feature_code)

    return FeatureCheckResponse(has_feature=has_feature, feature_code=feature_code)