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package com.spice.profitmandi.dao.service;

import com.spice.profitmandi.common.exception.ProfitMandiBusinessException;
import com.spice.profitmandi.common.model.CustomPaymentOption;
import com.spice.profitmandi.dao.entity.catalog.Item;
import com.spice.profitmandi.dao.entity.dtr.ScratchOffer;
import com.spice.profitmandi.dao.entity.fofo.FofoOrder;
import com.spice.profitmandi.dao.entity.fofo.FofoOrderItem;
import com.spice.profitmandi.dao.entity.scratch.GiftEntity;
import com.spice.profitmandi.dao.entity.scratch.OfferEntity;
import com.spice.profitmandi.dao.entity.scratch.ScratchRequest;
import com.spice.profitmandi.dao.repository.catalog.ItemRepository;
import com.spice.profitmandi.dao.repository.dtr.ScratchOfferRepository;
import com.spice.profitmandi.dao.repository.fofo.FofoOrderItemRepository;
import com.spice.profitmandi.dao.repository.fofo.FofoOrderRepository;
import com.spice.profitmandi.dao.repository.scratch.GiftRepository;
import com.spice.profitmandi.dao.repository.scratch.SeasonalOfferRepository;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.function.Function;
import java.util.stream.Collectors;

@Service
public class ScratchService {
    private static final Logger logger = LogManager.getLogger(ScratchService.class);
    @Autowired
    SeasonalOfferRepository seasonalOfferRepository;
    @Autowired
    GiftRepository giftRepository;
    @Autowired
    ScratchOfferRepository scratchOfferRepository;
    @Autowired
    FofoOrderItemRepository fofoOrderItemRepository;
    @Autowired
    ItemRepository itemRepository;
    @Autowired
    FofoOrderRepository fofoOrderRepository;


    public void processScratchOffer(int fofoOrderId, Set<CustomPaymentOption> paymentOptions, Set<Integer> fofoOrderItemIds) throws ProfitMandiBusinessException {
        List<OfferEntity> activeOffers = seasonalOfferRepository.getOffersByDate(LocalDate.now());
        if (activeOffers.isEmpty()) {
            return;
        }

        FofoOrder fofoOrder = fofoOrderRepository.selectByOrderId(fofoOrderId);
        OfferEntity eligibleOffer = findEligibleOffer(activeOffers, fofoOrder);
        if (eligibleOffer == null) {
            logger.info("No eligible offer for order {}", fofoOrderId);
            return;
        }

        ScratchOffer availedOffer = scratchOfferRepository.getScractchOfferByCustomerIdAndOfferId(fofoOrder.getCustomerId(), eligibleOffer.getId());
        if (availedOffer != null) {
            logger.info("Customer {} already availed offer {}", fofoOrder.getCustomerId(), eligibleOffer.getId());
            return;
        }

        this.processOffer(eligibleOffer, fofoOrder);
    }

    private OfferEntity findEligibleOffer(List<OfferEntity> activeOffers, FofoOrder fofoOrder) {
        int customerFofoId = fofoOrder.getFofoId();

        // Check PartnerWise offers first
        for (OfferEntity activeOffer : activeOffers) {
            if (!"PartnerWise".equals(activeOffer.getClassification())) {
                continue;
            }
            List<GiftEntity> gifts = giftRepository.findByOfferId(activeOffer.getId());
            for (GiftEntity gift : gifts) {
                if (gift.getFofoStore() == null || gift.getFofoStore().trim().isEmpty()) {
                    continue;
                }
                boolean matches = Arrays.stream(gift.getFofoStore().split(","))
                        .map(String::trim)
                        .filter(s -> !s.isEmpty())
                        .anyMatch(store -> {
                            try {
                                return Integer.parseInt(store) == customerFofoId;
                            } catch (NumberFormatException e) {
                                return false;
                            }
                        });
                if (matches) {
                    return activeOffer;
                }
            }
        }

        // Fallback to first non-PartnerWise offer
        return activeOffers.stream()
                .filter(offer -> !"PartnerWise".equals(offer.getClassification()))
                .findFirst()
                .orElse(null);
    }


    private boolean checkGiftAvailability(LocalDate date, int perDayMaxQty, OfferEntity offer) {
        GiftEntity defaultGift = giftRepository.getDefaultGift(offer.getId());
        if (defaultGift == null) return false;
        Integer giftCounts = scratchOfferRepository.countTodaysGiftDistribution(date.atStartOfDay(), date.atTime(LocalTime.MAX), defaultGift.getId());
        return giftCounts < perDayMaxQty;
    }

    private boolean isAppleItem(FofoOrder fofoOrder) {
        List<FofoOrderItem> fofoOrderItems = fofoOrderItemRepository.selectByOrderId(fofoOrder.getId());
        if (fofoOrderItems == null || fofoOrderItems.isEmpty()) {
            return false;
        }
        return fofoOrderItems.stream()
                .anyMatch(item -> item != null && "apple".equalsIgnoreCase(item.getBrand()));
    }

    private boolean processOffer(OfferEntity offer, FofoOrder fofoOrder) {
        logger.info("Processing offer {} for order {}", offer.getId(), fofoOrder.getId());

        List<GiftEntity> allGifts = giftRepository.findNonDefaultGIft(offer.getId());
        GiftEntity defaultGift = giftRepository.getDefaultGift(offer.getId());

        if (allGifts.isEmpty()) {
            logger.warn("Offer {} has no gifts", offer.getId());
            return false;
        }

        // Apple items always get the last gift
        if (isAppleItem(fofoOrder)) {
            GiftEntity lastGift = allGifts.get(allGifts.size() - 1);
            if (lastGift.getMaxRedemptions() > 0) {
                createScratchOffer(fofoOrder, offer, lastGift);
            } else {
                createBetterLuckNextTimeScratch(fofoOrder, offer);
            }
            return true;
        }

        // Check daily limit
        if (!checkGiftAvailability(LocalDate.now(), offer.getUserLimit(), offer)) {
            createDefaultGiftScratch(fofoOrder, offer, defaultGift);
            return true;
        }

        // Find eligible gifts by cart value and category
        List<FofoOrderItem> orderItems = fofoOrderItemRepository.selectByOrderId(fofoOrder.getId());
        Set<Integer> itemCategoryIds = new HashSet<>();
        for (FofoOrderItem orderItem : orderItems) {
            try {
                Item item = itemRepository.selectById(orderItem.getItemId());
                if (item != null) {
                    itemCategoryIds.add(item.getCategoryId());
                }
            } catch (ProfitMandiBusinessException e) {
                logger.warn("Item {} not found", orderItem.getItemId());
            }
        }

        float totalAmount = fofoOrder.getTotalAmount();
        List<GiftEntity> allOfferGifts = giftRepository.findByOfferId(offer.getId());
        List<GiftEntity> eligibleGifts = allOfferGifts.stream()
                .filter(gift -> gift.getMaxRedemptions() > 0
                        && totalAmount >= gift.getMinCartValue()
                        && totalAmount <= gift.getMaxCartValue()
                        && itemCategoryIds.stream().anyMatch(catId -> isItemCategoryEligible(gift.getProductCategory(), catId)))
                .collect(Collectors.toList());

        if (eligibleGifts.isEmpty()) {
            createDefaultGiftScratch(fofoOrder, offer, defaultGift);
            return true;
        }

        GiftEntity selectedGift = selectGiftByClassification(offer, eligibleGifts, fofoOrder);
        if (selectedGift == null || selectedGift.getMaxRedemptions() <= 0) {
            createDefaultGiftScratch(fofoOrder, offer, defaultGift);
            return true;
        }

        createScratchOffer(fofoOrder, offer, selectedGift);
        return true;
    }


    private boolean isItemCategoryEligible(String giftCategories, Integer itemCategoryId) {
        if (giftCategories == null || giftCategories.trim().isEmpty()) {
            return false;
        }
        return Arrays.stream(giftCategories.split(","))
                .map(String::trim)
                .filter(s -> !s.isEmpty())
                .map(category -> {
                    try {
                        return Integer.parseInt(category);
                    } catch (NumberFormatException e) {
                        return -1;
                    }
                })
                .anyMatch(itemCategoryId::equals);
    }

    private GiftEntity selectGiftByClassification(OfferEntity offer, List<GiftEntity> eligibleGifts, FofoOrder fofoOrder) {
        switch (offer.getClassification()) {
            case "Serial":
                return eligibleGifts.get(0);
            case "Random":
                List<GiftEntity> shuffled = new ArrayList<>(eligibleGifts);
                Collections.shuffle(shuffled);
                return shuffled.get(0);
            case "PartnerWise":
                int fofoId = fofoOrder.getFofoId();
                return eligibleGifts.stream()
                        .filter(gift -> gift.getFofoStore() != null
                                && Arrays.stream(gift.getFofoStore().split(","))
                                .map(String::trim)
                                .anyMatch(s -> {
                                    try { return Integer.parseInt(s) == fofoId; }
                                    catch (NumberFormatException e) { return false; }
                                }))
                        .findFirst()
                        .orElse(null);
            default:
                logger.warn("Unknown classification: {}", offer.getClassification());
                return null;
        }
    }

    public void createBetterLuckNextTimeScratch(FofoOrder order, OfferEntity offer) {
        ScratchOffer so = new ScratchOffer();
        so.setCustomerId(order.getCustomerId());
        so.setOfferId(offer.getId());
        so.setGiftId(1);
        so.setInvoiceNumber(order.getInvoiceNumber());
        so.setCreatedTimestamp(LocalDateTime.now());
        so.setOfferName(offer.getName());
        scratchOfferRepository.persist(so);
    }

    public void createScratchOffer(FofoOrder order, OfferEntity offer, GiftEntity gift) {
        int updated = giftRepository.decrementMaxRedemptions(gift.getId());
        if (updated == 0) {
            logger.warn("Gift {} has no remaining redemptions", gift.getId());
            return;
        }

        ScratchOffer so = new ScratchOffer();
        so.setCustomerId(order.getCustomerId());
        so.setOfferId(offer.getId());
        so.setGiftId(gift.getId());
        so.setInvoiceNumber(order.getInvoiceNumber());
        so.setCreatedTimestamp(LocalDateTime.now());
        so.setOfferName(gift.getName());
        scratchOfferRepository.persist(so);
        logger.info("Created scratch offer for order {} gift {}", order.getId(), gift.getId());
    }

    public void createDefaultGiftScratch(FofoOrder order, OfferEntity offer, GiftEntity gift) {
        ScratchOffer so = new ScratchOffer();
        so.setCustomerId(order.getCustomerId());
        so.setOfferId(offer.getId());
        so.setGiftId(gift.getId());
        so.setInvoiceNumber(order.getInvoiceNumber());
        so.setCreatedTimestamp(LocalDateTime.now());
        so.setOfferName(gift.getName());
        scratchOfferRepository.persist(so);
    }


    public boolean createOffer(ScratchRequest request) {
        OfferEntity offer = mapToOfferEntity(request);
        seasonalOfferRepository.save(offer);
        List<GiftEntity> gifts = mapToGiftEntities(request.getGifts(), offer.getId());
        gifts.forEach(giftRepository::save);
        return offer.getId() > 0 && giftRepository.findByOfferId(offer.getId()).size() == request.getGifts().size();
    }

    public boolean updateOffer(Integer offerId, ScratchRequest request) {
        OfferEntity existingOffer = seasonalOfferRepository.findById(offerId);
        boolean res = false;
        if (existingOffer != null) {
            updateOfferEntity(existingOffer, request);
            updateGifts(existingOffer.getId(), request.getGifts());
            res = true;
        }
        return res;
    }

    //update offer
    private void updateOfferEntity(OfferEntity existingOffer, ScratchRequest request) {
        existingOffer.setName(request.getName());
        existingOffer.setDescription(request.getDescription());
        existingOffer.setStartDate(request.getStartDate());
        existingOffer.setEndDate(request.getEndDate());
        existingOffer.setTermsCondition(request.getTermsCondition());
        existingOffer.setUserLimit(request.getUserLimit());
        existingOffer.setScratchValidity(request.getScratchValidity());
        existingOffer.setProductCategory(request.getProductCategory());
        existingOffer.setPaymentMethod(request.getPaymentMethod());
        existingOffer.setClassification(request.getClassification());
    }

    //update gift
    private void updateGifts(Integer offerId, List<ScratchRequest.GiftData> giftsData) {
        Map<Integer, GiftEntity> existingGifts = giftRepository.findByOfferId(offerId).stream().collect(Collectors.toMap(GiftEntity::getId, Function.identity()));

        for (ScratchRequest.GiftData giftData : giftsData) {
            if (giftData.getId() != null && existingGifts.containsKey(giftData.getId())) {
                GiftEntity existingGift = existingGifts.get(giftData.getId());
                updateGiftEntity(existingGift, giftData);
                existingGifts.remove(giftData.getId());
            } else {
                GiftEntity gift = new GiftEntity();
                gift.setName(giftData.getName());
                gift.setThumbnailUrl(giftData.getThumbnailUrl());
                gift.setMinCartValue(giftData.getMinCartValue());
                gift.setMaxRedemptions(giftData.getMaxRedemptions());
                gift.setOfferId(offerId);
                gift.setMaxCartValue(giftData.getMaxCartValue());
                gift.setFofoStore(giftData.getFofoStore());
                gift.setProductCategory(giftData.getProductCategory());
                gift.setIsDefault(giftData.isDefault());
                giftRepository.save(gift);
            }
        }
    }

    private void updateGiftEntity(GiftEntity gift, ScratchRequest.GiftData data) {
        gift.setName(data.getName());
        gift.setThumbnailUrl(data.getThumbnailUrl());
        gift.setMinCartValue(data.getMinCartValue());
        gift.setMaxRedemptions(data.getMaxRedemptions());
        gift.setMaxCartValue(data.getMaxCartValue());
        gift.setFofoStore(data.getFofoStore());
        gift.setProductCategory(data.getProductCategory());
        gift.setIsDefault(data.isDefault());
    }

    //offer
    private OfferEntity mapToOfferEntity(ScratchRequest request) {
        OfferEntity offer = new OfferEntity();
        offer.setName(request.getName());
        offer.setDescription(request.getDescription());
        offer.setOfferImage(request.getOfferImage());
        offer.setOfferType(request.getOfferType());
        offer.setStartDate(request.getStartDate());
        offer.setEndDate(request.getEndDate());
        offer.setTermsCondition(request.getTermsCondition());
        offer.setUserLimit(request.getUserLimit());
        offer.setScratchValidity(request.getScratchValidity());
        offer.setProductCategory(request.getProductCategory());
        offer.setPaymentMethod(request.getPaymentMethod());
        offer.setClassification(request.getClassification());
        logger.info("active flag - " + request.isActive());
        offer.setActive(request.isActive());
        return offer;
    }

    //gift
    private List<GiftEntity> mapToGiftEntities(List<ScratchRequest.GiftData> giftsData, Integer offerId) {
        return giftsData.stream().map(giftData -> {
            logger.info("giftData: {}", giftData);
            GiftEntity gift = new GiftEntity();
            gift.setName(giftData.getName());
            gift.setThumbnailUrl(giftData.getThumbnailUrl());
            gift.setMinCartValue(giftData.getMinCartValue());
            gift.setMaxRedemptions(giftData.getMaxRedemptions());
            gift.setOfferId(offerId);
            gift.setMaxCartValue(giftData.getMaxCartValue());
            gift.setFofoStore(giftData.getFofoStore());
            gift.setProductCategory(giftData.getProductCategory());
            gift.setIsDefault(giftData.isDefault());
            return gift;
        }).collect(Collectors.toList());
    }

}