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

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

import logging

from fastapi import APIRouter, Depends, HTTPException, 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 (
    ProgramListResponse,
    ProgramResponse,
    ProgramStatsResponse,
    CompanyStatsResponse,
    CompanySettingsResponse,
    CompanySettingsUpdate,
)
from app.modules.loyalty.services import program_service
from app.modules.tenancy.models import User

logger = logging.getLogger(__name__)

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


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


@admin_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 company name"),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """List all loyalty programs (platform admin)."""
    from sqlalchemy import func

    from app.modules.loyalty.models import LoyaltyCard, LoyaltyTransaction
    from app.modules.tenancy.models import Company

    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 company name
        company = db.query(Company).filter(Company.id == program.company_id).first()
        if company:
            response.company_name = company.name

        # Get basic stats for this program
        response.total_cards = (
            db.query(func.count(LoyaltyCard.id))
            .filter(LoyaltyCard.company_id == program.company_id)
            .scalar()
            or 0
        )
        response.active_cards = (
            db.query(func.count(LoyaltyCard.id))
            .filter(
                LoyaltyCard.company_id == program.company_id,
                LoyaltyCard.is_active == True,
            )
            .scalar()
            or 0
        )
        response.total_points_issued = (
            db.query(func.sum(LoyaltyTransaction.points_delta))
            .filter(
                LoyaltyTransaction.company_id == program.company_id,
                LoyaltyTransaction.points_delta > 0,
            )
            .scalar()
            or 0
        )
        response.total_points_redeemed = (
            db.query(func.sum(func.abs(LoyaltyTransaction.points_delta)))
            .filter(
                LoyaltyTransaction.company_id == program.company_id,
                LoyaltyTransaction.points_delta < 0,
            )
            .scalar()
            or 0
        )

        program_responses.append(response)

    return ProgramListResponse(programs=program_responses, total=total)


@admin_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


@admin_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)


# =============================================================================
# Company Management
# =============================================================================


@admin_router.get("/companies/{company_id}/stats", response_model=CompanyStatsResponse)
def get_company_stats(
    company_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Get company-wide loyalty statistics across all locations."""
    stats = program_service.get_company_stats(db, company_id)
    if "error" in stats:
        raise HTTPException(status_code=404, detail=stats["error"])

    return CompanyStatsResponse(**stats)


@admin_router.get("/companies/{company_id}/settings", response_model=CompanySettingsResponse)
def get_company_settings(
    company_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Get company loyalty settings."""
    settings = program_service.get_or_create_company_settings(db, company_id)
    return CompanySettingsResponse.model_validate(settings)


@admin_router.patch("/companies/{company_id}/settings", response_model=CompanySettingsResponse)
def update_company_settings(
    data: CompanySettingsUpdate,
    company_id: int = Path(..., gt=0),
    current_user: User = Depends(get_current_admin_api),
    db: Session = Depends(get_db),
):
    """Update company loyalty settings (admin only)."""
    from app.modules.loyalty.models import CompanyLoyaltySettings

    settings = program_service.get_or_create_company_settings(db, company_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 company {company_id} loyalty settings: {list(update_data.keys())}")

    return CompanySettingsResponse.model_validate(settings)


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


@admin_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."""
    from sqlalchemy import func

    from app.modules.loyalty.models import LoyaltyCard, LoyaltyProgram, LoyaltyTransaction

    # Program counts
    total_programs = db.query(func.count(LoyaltyProgram.id)).scalar() or 0
    active_programs = (
        db.query(func.count(LoyaltyProgram.id))
        .filter(LoyaltyProgram.is_active == True)
        .scalar()
        or 0
    )

    # Card counts
    total_cards = db.query(func.count(LoyaltyCard.id)).scalar() or 0
    active_cards = (
        db.query(func.count(LoyaltyCard.id))
        .filter(LoyaltyCard.is_active == True)
        .scalar()
        or 0
    )

    # Transaction counts (last 30 days)
    from datetime import UTC, datetime, timedelta

    thirty_days_ago = datetime.now(UTC) - timedelta(days=30)
    transactions_30d = (
        db.query(func.count(LoyaltyTransaction.id))
        .filter(LoyaltyTransaction.transaction_at >= thirty_days_ago)
        .scalar()
        or 0
    )

    # Points issued/redeemed (last 30 days)
    points_issued_30d = (
        db.query(func.sum(LoyaltyTransaction.points_delta))
        .filter(
            LoyaltyTransaction.transaction_at >= thirty_days_ago,
            LoyaltyTransaction.points_delta > 0,
        )
        .scalar()
        or 0
    )

    points_redeemed_30d = (
        db.query(func.sum(func.abs(LoyaltyTransaction.points_delta)))
        .filter(
            LoyaltyTransaction.transaction_at >= thirty_days_ago,
            LoyaltyTransaction.points_delta < 0,
        )
        .scalar()
        or 0
    )

    # Company count with programs
    companies_with_programs = (
        db.query(func.count(func.distinct(LoyaltyProgram.company_id))).scalar() or 0
    )

    return {
        "total_programs": total_programs,
        "active_programs": active_programs,
        "companies_with_programs": companies_with_programs,
        "total_cards": total_cards,
        "active_cards": active_cards,
        "transactions_30d": transactions_30d,
        "points_issued_30d": points_issued_30d,
        "points_redeemed_30d": points_redeemed_30d,
    }