# app/modules/loyalty/routes/api/vendor.py
"""
Loyalty module vendor routes.

Store/vendor endpoints for:
- Program management
- Staff PINs
- Card operations (stamps, points, redemptions)
- Customer cards lookup
- Dashboard stats
"""

import logging

from fastapi import APIRouter, Depends, HTTPException, Path, Query, Request
from sqlalchemy.orm import Session

from app.api.deps import get_current_vendor_api, require_module_access
from app.core.database import get_db
from app.modules.loyalty.exceptions import (
    LoyaltyCardNotFoundException,
    LoyaltyException,
    LoyaltyProgramNotFoundException,
)
from app.modules.loyalty.schemas import (
    CardDetailResponse,
    CardEnrollRequest,
    CardListResponse,
    CardLookupResponse,
    CardResponse,
    PinCreate,
    PinListResponse,
    PinResponse,
    PinUpdate,
    PointsEarnRequest,
    PointsEarnResponse,
    PointsRedeemRequest,
    PointsRedeemResponse,
    ProgramCreate,
    ProgramResponse,
    ProgramStatsResponse,
    ProgramUpdate,
    StampRedeemRequest,
    StampRedeemResponse,
    StampRequest,
    StampResponse,
)
from app.modules.loyalty.services import (
    card_service,
    pin_service,
    points_service,
    program_service,
    stamp_service,
    wallet_service,
)
from app.modules.enums import FrontendType
from app.modules.tenancy.models import User

logger = logging.getLogger(__name__)

# Vendor router with module access control
vendor_router = APIRouter(
    prefix="/loyalty",
    dependencies=[Depends(require_module_access("loyalty", FrontendType.VENDOR))],
)


def get_client_info(request: Request) -> tuple[str | None, str | None]:
    """Extract client IP and user agent from request."""
    ip = request.client.host if request.client else None
    user_agent = request.headers.get("user-agent")
    return ip, user_agent


# =============================================================================
# Program Management
# =============================================================================


@vendor_router.get("/program", response_model=ProgramResponse)
def get_program(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Get the vendor's loyalty program."""
    vendor_id = current_user.token_vendor_id

    program = program_service.get_program_by_vendor(db, vendor_id)
    if not program:
        raise HTTPException(status_code=404, detail="No loyalty program configured")

    response = ProgramResponse.model_validate(program)
    response.is_stamps_enabled = program.is_stamps_enabled
    response.is_points_enabled = program.is_points_enabled
    response.display_name = program.display_name

    return response


@vendor_router.post("/program", response_model=ProgramResponse, status_code=201)
def create_program(
    data: ProgramCreate,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Create a loyalty program for the vendor."""
    vendor_id = current_user.token_vendor_id

    try:
        program = program_service.create_program(db, vendor_id, data)
    except LoyaltyException as e:
        raise HTTPException(status_code=e.status_code, detail=e.message)

    response = ProgramResponse.model_validate(program)
    response.is_stamps_enabled = program.is_stamps_enabled
    response.is_points_enabled = program.is_points_enabled
    response.display_name = program.display_name

    return response


@vendor_router.patch("/program", response_model=ProgramResponse)
def update_program(
    data: ProgramUpdate,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Update the vendor's loyalty program."""
    vendor_id = current_user.token_vendor_id

    program = program_service.get_program_by_vendor(db, vendor_id)
    if not program:
        raise HTTPException(status_code=404, detail="No loyalty program configured")

    program = program_service.update_program(db, program.id, data)

    response = ProgramResponse.model_validate(program)
    response.is_stamps_enabled = program.is_stamps_enabled
    response.is_points_enabled = program.is_points_enabled
    response.display_name = program.display_name

    return response


@vendor_router.get("/stats", response_model=ProgramStatsResponse)
def get_stats(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Get loyalty program statistics."""
    vendor_id = current_user.token_vendor_id

    program = program_service.get_program_by_vendor(db, vendor_id)
    if not program:
        raise HTTPException(status_code=404, detail="No loyalty program configured")

    stats = program_service.get_program_stats(db, program.id)
    return ProgramStatsResponse(**stats)


# =============================================================================
# Staff PINs
# =============================================================================


@vendor_router.get("/pins", response_model=PinListResponse)
def list_pins(
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """List all staff PINs for the loyalty program."""
    vendor_id = current_user.token_vendor_id

    program = program_service.get_program_by_vendor(db, vendor_id)
    if not program:
        raise HTTPException(status_code=404, detail="No loyalty program configured")

    pins = pin_service.list_pins(db, program.id)

    return PinListResponse(
        pins=[PinResponse.model_validate(pin) for pin in pins],
        total=len(pins),
    )


@vendor_router.post("/pins", response_model=PinResponse, status_code=201)
def create_pin(
    data: PinCreate,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Create a new staff PIN."""
    vendor_id = current_user.token_vendor_id

    program = program_service.get_program_by_vendor(db, vendor_id)
    if not program:
        raise HTTPException(status_code=404, detail="No loyalty program configured")

    pin = pin_service.create_pin(db, program.id, vendor_id, data)
    return PinResponse.model_validate(pin)


@vendor_router.patch("/pins/{pin_id}", response_model=PinResponse)
def update_pin(
    pin_id: int = Path(..., gt=0),
    data: PinUpdate = None,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Update a staff PIN."""
    pin = pin_service.update_pin(db, pin_id, data)
    return PinResponse.model_validate(pin)


@vendor_router.delete("/pins/{pin_id}", status_code=204)
def delete_pin(
    pin_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Delete a staff PIN."""
    pin_service.delete_pin(db, pin_id)


@vendor_router.post("/pins/{pin_id}/unlock", response_model=PinResponse)
def unlock_pin(
    pin_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Unlock a locked staff PIN."""
    pin = pin_service.unlock_pin(db, pin_id)
    return PinResponse.model_validate(pin)


# =============================================================================
# Card Management
# =============================================================================


@vendor_router.get("/cards", response_model=CardListResponse)
def list_cards(
    skip: int = Query(0, ge=0),
    limit: int = Query(50, ge=1, le=100),
    is_active: bool | None = Query(None),
    search: str | None = Query(None, max_length=100),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """List loyalty cards for the vendor."""
    vendor_id = current_user.token_vendor_id

    program = program_service.get_program_by_vendor(db, vendor_id)
    if not program:
        raise HTTPException(status_code=404, detail="No loyalty program configured")

    cards, total = card_service.list_cards(
        db,
        vendor_id,
        skip=skip,
        limit=limit,
        is_active=is_active,
        search=search,
    )

    card_responses = []
    for card in cards:
        response = CardResponse(
            id=card.id,
            card_number=card.card_number,
            customer_id=card.customer_id,
            vendor_id=card.vendor_id,
            program_id=card.program_id,
            stamp_count=card.stamp_count,
            stamps_target=program.stamps_target,
            stamps_until_reward=max(0, program.stamps_target - card.stamp_count),
            total_stamps_earned=card.total_stamps_earned,
            stamps_redeemed=card.stamps_redeemed,
            points_balance=card.points_balance,
            total_points_earned=card.total_points_earned,
            points_redeemed=card.points_redeemed,
            is_active=card.is_active,
            created_at=card.created_at,
            has_google_wallet=bool(card.google_object_id),
            has_apple_wallet=bool(card.apple_serial_number),
        )
        card_responses.append(response)

    return CardListResponse(cards=card_responses, total=total)


@vendor_router.post("/cards/lookup", response_model=CardLookupResponse)
def lookup_card(
    request: Request,
    card_id: int | None = Query(None),
    qr_code: str | None = Query(None),
    card_number: str | None = Query(None),
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Look up a card by ID, QR code, or card number."""
    vendor_id = current_user.token_vendor_id

    try:
        card = card_service.lookup_card(
            db,
            card_id=card_id,
            qr_code=qr_code,
            card_number=card_number,
        )
    except LoyaltyCardNotFoundException:
        raise HTTPException(status_code=404, detail="Card not found")

    # Verify card belongs to this vendor
    if card.vendor_id != vendor_id:
        raise HTTPException(status_code=404, detail="Card not found")

    program = card.program

    # Check cooldown
    can_stamp, _ = card.can_stamp(program.cooldown_minutes)
    cooldown_ends = None
    if not can_stamp and card.last_stamp_at:
        from datetime import timedelta

        cooldown_ends = card.last_stamp_at + timedelta(minutes=program.cooldown_minutes)

    # Get stamps today
    stamps_today = card_service.get_stamps_today(db, card.id)

    return CardLookupResponse(
        card_id=card.id,
        card_number=card.card_number,
        customer_id=card.customer_id,
        customer_name=card.customer.full_name if card.customer else None,
        customer_email=card.customer.email if card.customer else "",
        stamp_count=card.stamp_count,
        stamps_target=program.stamps_target,
        stamps_until_reward=max(0, program.stamps_target - card.stamp_count),
        points_balance=card.points_balance,
        can_redeem_stamps=card.stamp_count >= program.stamps_target,
        stamp_reward_description=program.stamps_reward_description,
        can_stamp=can_stamp,
        cooldown_ends_at=cooldown_ends,
        stamps_today=stamps_today,
        max_daily_stamps=program.max_daily_stamps,
        can_earn_more_stamps=stamps_today < program.max_daily_stamps,
    )


@vendor_router.post("/cards/enroll", response_model=CardResponse, status_code=201)
def enroll_customer(
    data: CardEnrollRequest,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Enroll a customer in the loyalty program."""
    vendor_id = current_user.token_vendor_id

    if not data.customer_id:
        raise HTTPException(status_code=400, detail="customer_id is required")

    try:
        card = card_service.enroll_customer(db, data.customer_id, vendor_id)
    except LoyaltyException as e:
        raise HTTPException(status_code=e.status_code, detail=e.message)

    program = card.program

    return CardResponse(
        id=card.id,
        card_number=card.card_number,
        customer_id=card.customer_id,
        vendor_id=card.vendor_id,
        program_id=card.program_id,
        stamp_count=card.stamp_count,
        stamps_target=program.stamps_target,
        stamps_until_reward=program.stamps_target,
        total_stamps_earned=card.total_stamps_earned,
        stamps_redeemed=card.stamps_redeemed,
        points_balance=card.points_balance,
        total_points_earned=card.total_points_earned,
        points_redeemed=card.points_redeemed,
        is_active=card.is_active,
        created_at=card.created_at,
    )


# =============================================================================
# Stamp Operations
# =============================================================================


@vendor_router.post("/stamp", response_model=StampResponse)
def add_stamp(
    request: Request,
    data: StampRequest,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Add a stamp to a loyalty card."""
    ip, user_agent = get_client_info(request)

    try:
        result = stamp_service.add_stamp(
            db,
            card_id=data.card_id,
            qr_code=data.qr_code,
            card_number=data.card_number,
            staff_pin=data.staff_pin,
            ip_address=ip,
            user_agent=user_agent,
            notes=data.notes,
        )
    except LoyaltyException as e:
        raise HTTPException(status_code=e.status_code, detail=e.message)

    return StampResponse(**result)


@vendor_router.post("/stamp/redeem", response_model=StampRedeemResponse)
def redeem_stamps(
    request: Request,
    data: StampRedeemRequest,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Redeem stamps for a reward."""
    ip, user_agent = get_client_info(request)

    try:
        result = stamp_service.redeem_stamps(
            db,
            card_id=data.card_id,
            qr_code=data.qr_code,
            card_number=data.card_number,
            staff_pin=data.staff_pin,
            ip_address=ip,
            user_agent=user_agent,
            notes=data.notes,
        )
    except LoyaltyException as e:
        raise HTTPException(status_code=e.status_code, detail=e.message)

    return StampRedeemResponse(**result)


# =============================================================================
# Points Operations
# =============================================================================


@vendor_router.post("/points", response_model=PointsEarnResponse)
def earn_points(
    request: Request,
    data: PointsEarnRequest,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Earn points from a purchase."""
    ip, user_agent = get_client_info(request)

    try:
        result = points_service.earn_points(
            db,
            card_id=data.card_id,
            qr_code=data.qr_code,
            card_number=data.card_number,
            purchase_amount_cents=data.purchase_amount_cents,
            order_reference=data.order_reference,
            staff_pin=data.staff_pin,
            ip_address=ip,
            user_agent=user_agent,
            notes=data.notes,
        )
    except LoyaltyException as e:
        raise HTTPException(status_code=e.status_code, detail=e.message)

    return PointsEarnResponse(**result)


@vendor_router.post("/points/redeem", response_model=PointsRedeemResponse)
def redeem_points(
    request: Request,
    data: PointsRedeemRequest,
    current_user: User = Depends(get_current_vendor_api),
    db: Session = Depends(get_db),
):
    """Redeem points for a reward."""
    ip, user_agent = get_client_info(request)

    try:
        result = points_service.redeem_points(
            db,
            card_id=data.card_id,
            qr_code=data.qr_code,
            card_number=data.card_number,
            reward_id=data.reward_id,
            staff_pin=data.staff_pin,
            ip_address=ip,
            user_agent=user_agent,
            notes=data.notes,
        )
    except LoyaltyException as e:
        raise HTTPException(status_code=e.status_code, detail=e.message)

    return PointsRedeemResponse(**result)
