# app/modules/tenancy/routes/api/merchant.py
"""
Tenancy module merchant API routes.

Provides merchant-facing API endpoints for the merchant portal:
- /account/stores - List merchant's stores
- /account/profile - Get/update merchant profile

Auto-discovered by the route system (merchant.py in routes/api/).
"""

import logging
from typing import Optional

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

from app.api.deps import get_current_merchant_from_cookie_or_header
from app.core.database import get_db
from app.modules.tenancy.models import Merchant
from models.schema.auth import UserContext

logger = logging.getLogger(__name__)

router = APIRouter()

ROUTE_CONFIG = {
    "prefix": "/account",
}


# ============================================================================
# SCHEMAS
# ============================================================================


class MerchantProfileUpdate(BaseModel):
    """Schema for updating merchant profile information."""

    name: str | None = None
    contact_email: EmailStr | None = None
    contact_phone: str | None = None
    website: str | None = None
    business_address: str | None = None
    tax_number: str | None = None


# ============================================================================
# HELPERS
# ============================================================================


def _get_user_merchant(db: Session, user_context: UserContext) -> Merchant:
    """
    Get the first active merchant owned by the authenticated user.

    Args:
        db: Database session
        user_context: Authenticated user context

    Returns:
        Merchant: The user's active merchant

    Raises:
        HTTPException: 404 if user does not own any active merchant
    """
    merchant = (
        db.query(Merchant)
        .filter(
            Merchant.owner_user_id == user_context.id,
            Merchant.is_active == True,  # noqa: E712
        )
        .first()
    )

    if not merchant:
        raise HTTPException(status_code=404, detail="Merchant not found")

    return merchant


# ============================================================================
# ENDPOINTS
# ============================================================================


@router.get("/stores")
async def merchant_stores(
    request: Request,
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    db: Session = Depends(get_db),
):
    """
    List all stores belonging to the merchant.

    Returns a list of store summary dicts with basic info for each store
    owned by the authenticated merchant.
    """
    merchant = _get_user_merchant(db, current_user)

    stores = []
    for store in merchant.stores:
        stores.append(
            {
                "id": store.id,
                "name": store.name,
                "store_code": store.store_code,
                "is_active": store.is_active,
                "created_at": store.created_at.isoformat() if store.created_at else None,
            }
        )

    return {"stores": stores}


@router.get("/profile")
async def merchant_profile(
    request: Request,
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    db: Session = Depends(get_db),
):
    """
    Get the authenticated merchant's profile information.

    Returns merchant details including contact info, business details,
    and verification status.
    """
    merchant = _get_user_merchant(db, current_user)

    return {
        "id": merchant.id,
        "name": merchant.name,
        "contact_email": merchant.contact_email,
        "contact_phone": merchant.contact_phone,
        "website": merchant.website,
        "business_address": merchant.business_address,
        "tax_number": merchant.tax_number,
        "is_verified": merchant.is_verified,
    }


@router.put("/profile")
async def update_merchant_profile(
    request: Request,
    profile_data: MerchantProfileUpdate,
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    db: Session = Depends(get_db),
):
    """
    Update the authenticated merchant's profile information.

    Accepts partial updates - only provided fields are changed.
    """
    merchant = _get_user_merchant(db, current_user)

    # Apply only the fields that were explicitly provided
    update_data = profile_data.model_dump(exclude_unset=True)
    for field_name, value in update_data.items():
        setattr(merchant, field_name, value)

    db.commit()
    db.refresh(merchant)

    logger.info(
        f"Merchant profile updated: merchant_id={merchant.id}, "
        f"user={current_user.username}, fields={list(update_data.keys())}"
    )

    return {
        "id": merchant.id,
        "name": merchant.name,
        "contact_email": merchant.contact_email,
        "contact_phone": merchant.contact_phone,
        "website": merchant.website,
        "business_address": merchant.business_address,
        "tax_number": merchant.tax_number,
        "is_verified": merchant.is_verified,
    }