package com.wyrs.admin.service.config;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.wyrs.admin.config.WyrsConfigProperties;
import com.wyrs.admin.entity.MembershipPrice;
import com.wyrs.admin.util.PackageNameContext;
import java.math.BigDecimal;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import org.springframework.stereotype.Service;

@Service
public class PricesConfigService extends AbstractEntityListConfigService<MembershipPrice> {
    private static final TypeReference<EntityListStore<MembershipPrice>> TYPE =
            new TypeReference<EntityListStore<MembershipPrice>>() {};

    public PricesConfigService(WyrsConfigProperties config, ObjectMapper objectMapper) {
        super(config.resolveFile("prices.json"), objectMapper, TYPE, MembershipPrice::getId, MembershipPrice::getAppCode);
    }

    public List<MembershipPrice> findByAppCode(String appCode) {
        // Admin: all packages under appCode
        return this.findByAppCodeOrderByPriceAsc(appCode, false, null);
    }

    public List<MembershipPrice> findByAppCodeAndEnabledTrueOrderByPriceAsc(String appCode) {
        // Client: filter by X-Wyrs-Package / packageName
        return this.findByAppCodeOrderByPriceAsc(appCode, true, PackageNameContext.get());
    }

    private List<MembershipPrice> findByAppCodeOrderByPriceAsc(String appCode, boolean enabledOnly, String packageName) {
        Object object = this.lock;
        synchronized (object) {
            List<MembershipPrice> base = this.store.getItems().stream()
                    .filter(p -> appCode.equals(p.getAppCode()))
                    .filter(p -> !enabledOnly || Boolean.TRUE.equals(p.getEnabled()))
                    .sorted(Comparator.comparing(MembershipPrice::getPrice, Comparator.nullsLast(BigDecimal::compareTo)))
                    .toList();
            return filterByPackage(base, packageName);
        }
    }

    /**
     * Empty packageName: return all.
     * Non-empty: prefer exact package match; else fall back to blank packageName defaults.
     */
    public static List<MembershipPrice> filterByPackage(List<MembershipPrice> items, String packageName) {
        if (packageName == null || packageName.isBlank()) {
            return items;
        }
        String want = packageName.trim().toLowerCase(Locale.ROOT);
        List<MembershipPrice> exact = items.stream()
                .filter(p -> {
                    String pkg = p.getPackageName();
                    return pkg != null && !pkg.isBlank() && pkg.trim().toLowerCase(Locale.ROOT).equals(want);
                })
                .toList();
        if (!exact.isEmpty()) {
            return exact;
        }
        return items.stream()
                .filter(p -> {
                    String pkg = p.getPackageName();
                    return pkg == null || pkg.isBlank();
                })
                .toList();
    }

    public MembershipPrice save(MembershipPrice price) {
        if (price != null) {
            if (price.getPackageName() == null) {
                price.setPackageName("");
            }
            if (price.getBillingType() == null || price.getBillingType().isBlank()) {
                Integer days = price.getDurationDays();
                price.setBillingType(days != null && days > 0 ? "subscription" : "one_time");
            } else {
                String bt = price.getBillingType().trim().toLowerCase(Locale.ROOT);
                if ("sub".equals(bt) || "renew".equals(bt) || "auto".equals(bt)) {
                    bt = "subscription";
                }
                if ("once".equals(bt) || "onetime".equals(bt) || "iap".equals(bt)) {
                    bt = "one_time";
                }
                price.setBillingType("subscription".equals(bt) ? "subscription" : "one_time");
            }
            if (price.getChannelProductCodes() == null) {
                price.setChannelProductCodes(new LinkedHashMap<>());
            }
        }
        return this.save(price, MembershipPrice::setId);
    }
}