# app/api/v1/platform/pricing.py
"""
Public pricing API endpoints.

Provides subscription tier and add-on product information
for the marketing homepage and signup flow.
"""

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

from app.core.database import get_db
from models.database.subscription import (
    AddOnProduct,
    BillingPeriod,
    SubscriptionTier,
    TIER_LIMITS,
    TierCode,
)

router = APIRouter()


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


class TierFeature(BaseModel):
    """Feature included in a tier."""

    code: str
    name: str
    description: str | None = None


class TierResponse(BaseModel):
    """Subscription tier details for public display."""

    code: str
    name: str
    description: str | None
    price_monthly: float  # Price in euros
    price_annual: float | None  # Price in euros (null for enterprise)
    price_monthly_cents: int
    price_annual_cents: int | None
    orders_per_month: int | None  # None = unlimited
    products_limit: int | None  # None = unlimited
    team_members: int | None  # None = unlimited
    order_history_months: int | None  # None = unlimited
    features: list[str]
    is_popular: bool = False  # Highlight as recommended
    is_enterprise: bool = False  # Contact sales

    class Config:
        from_attributes = True


class AddOnResponse(BaseModel):
    """Add-on product details for public display."""

    code: str
    name: str
    description: str | None
    category: str
    price: float  # Price in euros
    price_cents: int
    billing_period: str
    quantity_unit: str | None
    quantity_value: int | None

    class Config:
        from_attributes = True


class PricingResponse(BaseModel):
    """Complete pricing information."""

    tiers: list[TierResponse]
    addons: list[AddOnResponse]
    trial_days: int
    annual_discount_months: int  # e.g., 2 = "2 months free"


# =============================================================================
# Feature Descriptions
# =============================================================================

FEATURE_DESCRIPTIONS = {
    "letzshop_sync": "Letzshop Order Sync",
    "inventory_basic": "Basic Inventory Management",
    "inventory_locations": "Warehouse Locations",
    "inventory_purchase_orders": "Purchase Orders",
    "invoice_lu": "Luxembourg VAT Invoicing",
    "invoice_eu_vat": "EU VAT Invoicing",
    "invoice_bulk": "Bulk Invoicing",
    "customer_view": "Customer List",
    "customer_export": "Customer Export",
    "analytics_dashboard": "Analytics Dashboard",
    "accounting_export": "Accounting Export",
    "api_access": "API Access",
    "automation_rules": "Automation Rules",
    "team_roles": "Team Roles & Permissions",
    "white_label": "White-Label Option",
    "multi_vendor": "Multi-Vendor Support",
    "custom_integrations": "Custom Integrations",
    "sla_guarantee": "SLA Guarantee",
    "dedicated_support": "Dedicated Account Manager",
}


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


@router.get("/tiers", response_model=list[TierResponse])
def get_tiers(db: Session = Depends(get_db)) -> list[TierResponse]:
    """
    Get all public subscription tiers.

    Returns tiers from database if available, falls back to hardcoded TIER_LIMITS.
    """
    # Try to get from database first
    db_tiers = (
        db.query(SubscriptionTier)
        .filter(
            SubscriptionTier.is_active == True,
            SubscriptionTier.is_public == True,
        )
        .order_by(SubscriptionTier.display_order)
        .all()
    )

    if db_tiers:
        return [
            TierResponse(
                code=tier.code,
                name=tier.name,
                description=tier.description,
                price_monthly=tier.price_monthly_cents / 100,
                price_annual=(tier.price_annual_cents / 100) if tier.price_annual_cents else None,
                price_monthly_cents=tier.price_monthly_cents,
                price_annual_cents=tier.price_annual_cents,
                orders_per_month=tier.orders_per_month,
                products_limit=tier.products_limit,
                team_members=tier.team_members,
                order_history_months=tier.order_history_months,
                features=tier.features or [],
                is_popular=tier.code == TierCode.PROFESSIONAL.value,
                is_enterprise=tier.code == TierCode.ENTERPRISE.value,
            )
            for tier in db_tiers
        ]

    # Fallback to hardcoded tiers
    tiers = []
    for tier_code, limits in TIER_LIMITS.items():
        tiers.append(
            TierResponse(
                code=tier_code.value,
                name=limits["name"],
                description=None,
                price_monthly=limits["price_monthly_cents"] / 100,
                price_annual=(limits["price_annual_cents"] / 100) if limits.get("price_annual_cents") else None,
                price_monthly_cents=limits["price_monthly_cents"],
                price_annual_cents=limits.get("price_annual_cents"),
                orders_per_month=limits.get("orders_per_month"),
                products_limit=limits.get("products_limit"),
                team_members=limits.get("team_members"),
                order_history_months=limits.get("order_history_months"),
                features=limits.get("features", []),
                is_popular=tier_code == TierCode.PROFESSIONAL,
                is_enterprise=tier_code == TierCode.ENTERPRISE,
            )
        )

    return tiers


@router.get("/tiers/{tier_code}", response_model=TierResponse)
def get_tier(tier_code: str, db: Session = Depends(get_db)) -> TierResponse:
    """Get a specific tier by code."""
    # Try database first
    tier = (
        db.query(SubscriptionTier)
        .filter(
            SubscriptionTier.code == tier_code,
            SubscriptionTier.is_active == True,
        )
        .first()
    )

    if tier:
        return TierResponse(
            code=tier.code,
            name=tier.name,
            description=tier.description,
            price_monthly=tier.price_monthly_cents / 100,
            price_annual=(tier.price_annual_cents / 100) if tier.price_annual_cents else None,
            price_monthly_cents=tier.price_monthly_cents,
            price_annual_cents=tier.price_annual_cents,
            orders_per_month=tier.orders_per_month,
            products_limit=tier.products_limit,
            team_members=tier.team_members,
            order_history_months=tier.order_history_months,
            features=tier.features or [],
            is_popular=tier.code == TierCode.PROFESSIONAL.value,
            is_enterprise=tier.code == TierCode.ENTERPRISE.value,
        )

    # Fallback to hardcoded
    try:
        tier_enum = TierCode(tier_code)
        limits = TIER_LIMITS[tier_enum]
        return TierResponse(
            code=tier_enum.value,
            name=limits["name"],
            description=None,
            price_monthly=limits["price_monthly_cents"] / 100,
            price_annual=(limits["price_annual_cents"] / 100) if limits.get("price_annual_cents") else None,
            price_monthly_cents=limits["price_monthly_cents"],
            price_annual_cents=limits.get("price_annual_cents"),
            orders_per_month=limits.get("orders_per_month"),
            products_limit=limits.get("products_limit"),
            team_members=limits.get("team_members"),
            order_history_months=limits.get("order_history_months"),
            features=limits.get("features", []),
            is_popular=tier_enum == TierCode.PROFESSIONAL,
            is_enterprise=tier_enum == TierCode.ENTERPRISE,
        )
    except ValueError:
        from fastapi import HTTPException
        raise HTTPException(status_code=404, detail=f"Tier '{tier_code}' not found")


@router.get("/addons", response_model=list[AddOnResponse])
def get_addons(db: Session = Depends(get_db)) -> list[AddOnResponse]:
    """
    Get all available add-on products.

    Returns add-ons from database, or empty list if none configured.
    """
    addons = (
        db.query(AddOnProduct)
        .filter(AddOnProduct.is_active == True)
        .order_by(AddOnProduct.category, AddOnProduct.display_order)
        .all()
    )

    return [
        AddOnResponse(
            code=addon.code,
            name=addon.name,
            description=addon.description,
            category=addon.category,
            price=addon.price_cents / 100,
            price_cents=addon.price_cents,
            billing_period=addon.billing_period,
            quantity_unit=addon.quantity_unit,
            quantity_value=addon.quantity_value,
        )
        for addon in addons
    ]


@router.get("/pricing", response_model=PricingResponse)
def get_pricing(db: Session = Depends(get_db)) -> PricingResponse:
    """
    Get complete pricing information (tiers + add-ons).

    This is the main endpoint for the pricing page.
    """
    from app.core.config import settings

    return PricingResponse(
        tiers=get_tiers(db),
        addons=get_addons(db),
        trial_days=settings.stripe_trial_days,
        annual_discount_months=2,  # "2 months free" with annual billing
    )