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

Platform admin endpoints for:
- Viewing all loyalty programs (merchant-based)
- Merchant loyalty settings management
- Platform-wide analytics
"""

import logging

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

from app.api.deps import get_current_admin_api, require_module_access
from app.core.database import get_db
from app.modules.enums import FrontendType
from app.modules.loyalty.schemas import (
    MerchantSettingsResponse,
    MerchantSettingsUpdate,
    MerchantStatsResponse,
    ProgramCreate,
    ProgramListResponse,
    ProgramResponse,
    ProgramStatsResponse,
    ProgramUpdate,
)
from app.modules.loyalty.services import program_service
from app.modules.tenancy.models import User  # API-007

logger = logging.getLogger(__name__)

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


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


@router.get("/programs", response_model=ProgramListResponse)
def list_programs(
    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, description="Search by merchant name"),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """List all loyalty programs (platform admin)."""
    programs, total = program_service.list_programs(
        db,
        skip=skip,
        limit=limit,
        is_active=is_active,
        search=search,
    )

    program_responses = []
    for program in programs:
        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

        # Get aggregation stats from service
        list_stats = program_service.get_program_list_stats(db, program)
        response.merchant_name = list_stats["merchant_name"]
        response.total_cards = list_stats["total_cards"]
        response.active_cards = list_stats["active_cards"]
        response.total_points_issued = list_stats["total_points_issued"]
        response.total_points_redeemed = list_stats["total_points_redeemed"]

        program_responses.append(response)

    return ProgramListResponse(programs=program_responses, total=total)


@router.get("/programs/{program_id}", response_model=ProgramResponse)
def get_program(
    program_id: int,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Get a specific loyalty program."""
    program = program_service.require_program(db, program_id)

    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


@router.get("/programs/{program_id}/stats", response_model=ProgramStatsResponse)
def get_program_stats(
    program_id: int,
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Get statistics for a loyalty program."""
    stats = program_service.get_program_stats(db, program_id)
    return ProgramStatsResponse(**stats)


@router.post(
    "/merchants/{merchant_id}/program", response_model=ProgramResponse, status_code=201
)
def create_program_for_merchant(
    data: ProgramCreate,
    merchant_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Create a loyalty program for a merchant (admin override)."""
    program = program_service.create_program(db, merchant_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

    logger.info(f"Admin created loyalty program for merchant {merchant_id}")
    return response


@router.patch("/programs/{program_id}", response_model=ProgramResponse)
def update_program(
    data: ProgramUpdate,
    program_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Update a loyalty program (admin override)."""
    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

    logger.info(f"Admin updated loyalty program {program_id}")
    return response


@router.delete("/programs/{program_id}", status_code=204)
def delete_program(
    program_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Delete a loyalty program (admin override)."""
    program_service.delete_program(db, program_id)
    logger.info(f"Admin deleted loyalty program {program_id}")


@router.post("/programs/{program_id}/activate", response_model=ProgramResponse)
def activate_program(
    program_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Activate a loyalty program."""
    program = program_service.activate_program(db, program_id)

    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

    logger.info(f"Admin activated loyalty program {program_id}")
    return response


@router.post("/programs/{program_id}/deactivate", response_model=ProgramResponse)
def deactivate_program(
    program_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Deactivate a loyalty program."""
    program = program_service.deactivate_program(db, program_id)

    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

    logger.info(f"Admin deactivated loyalty program {program_id}")
    return response


# =============================================================================
# Merchant Management
# =============================================================================


@router.get("/merchants/{merchant_id}/stats", response_model=MerchantStatsResponse)
def get_merchant_stats(
    merchant_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Get merchant-wide loyalty statistics across all locations."""
    stats = program_service.get_merchant_stats(db, merchant_id)

    return MerchantStatsResponse(**stats)


@router.get("/merchants/{merchant_id}/settings", response_model=MerchantSettingsResponse)
def get_merchant_settings(
    merchant_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Get merchant loyalty settings."""
    settings = program_service.get_or_create_merchant_settings(db, merchant_id)
    return MerchantSettingsResponse.model_validate(settings)


@router.patch("/merchants/{merchant_id}/settings", response_model=MerchantSettingsResponse)
def update_merchant_settings(
    data: MerchantSettingsUpdate,
    merchant_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Update merchant loyalty settings (admin only)."""

    settings = program_service.get_or_create_merchant_settings(db, merchant_id)

    update_data = data.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(settings, field, value)

    db.commit()
    db.refresh(settings)

    logger.info(f"Updated merchant {merchant_id} loyalty settings: {list(update_data.keys())}")

    return MerchantSettingsResponse.model_validate(settings)


# =============================================================================
# Platform Stats
# =============================================================================


@router.get("/stats")
def get_platform_stats(
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Get platform-wide loyalty statistics."""
    return program_service.get_platform_stats(db)