package com.sinata.appointment.service;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.sinata.appointment.constants.AppointmentBizConstants;
import com.sinata.appointment.constants.BizErrorCode;
import com.sinata.appointment.config.HikvisionQrcodeProperties;
import com.sinata.appointment.entity.AppointmentOrder;
import com.sinata.appointment.entity.AppointmentVisitor;
import com.sinata.appointment.entity.MpUser;
import com.sinata.appointment.entity.MpVisitor;
import com.sinata.appointment.exception.BizException;
import com.sinata.appointment.util.MobileMaskUtil;
import com.sinata.appointment.util.SensitiveDataUtil;
import java.nio.charset.StandardCharsets;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.Base64;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

/**
 * 海康出码适配：当前按 PDF 示例组装二维码 payload 字符串。
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class IntegrationHikvisionService {

    private static final String VISITOR_ID_CARD_TYPE = "111";
    private static final String VALID_TIME_PREFIX = "m";
    private static final String EMPTY = "";
    private static final DateTimeFormatter QR_TIME_FORMATTER =
            DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
    private static final DateTimeFormatter QR_DATE_FORMATTER =
            DateTimeFormatter.ofPattern("yyMMddHHmmss.SSS");

    private final ObjectMapper objectMapper;
    private final HikvisionQrcodeProperties properties;

    public String requestQrcodePayload(
            AppointmentOrder order,
            AppointmentVisitor visitor,
            MpVisitor visitorProfile,
            MpUser visitedUser,
            String visitPurpose,
            String areas,
            LocalDateTime qrGenerateTime,
            LocalDateTime qrExpireTime,
            int validMinutes,
            String codeId,
            String visitorIdCardPlain) {
        return buildPlainQrcodePayload(
                order,
                visitor,
                visitorProfile,
                visitedUser,
                visitPurpose,
                areas,
                qrGenerateTime,
                qrExpireTime,
                validMinutes,
                codeId,
                visitorIdCardPlain);
    }

    public String buildPlainQrcodePayload(
            AppointmentOrder order,
            AppointmentVisitor visitor,
            MpVisitor visitorProfile,
            MpUser visitedUser,
            String visitPurpose,
            String areas,
            LocalDateTime qrGenerateTime,
            LocalDateTime qrExpireTime,
            int validMinutes,
            String codeId,
            String visitorIdCardPlain) {
        LocalDateTime startTime = resolveVisitStartTime(order);
        LocalDateTime endTime = resolveVisitEndTime(order);
        Map<String, Object> payload = new LinkedHashMap<>();
        payload.put("visitorName", firstNonBlank(visitor.getName(), valueOf(visitorProfile, MpVisitor::getVisitorName)));
        payload.put("visitorIdCard", trimToEmpty(visitorIdCardPlain));
        payload.put("visitorIdCardType", VISITOR_ID_CARD_TYPE);
        payload.put("visitorPhone", firstNonBlank(visitor.getMobile(), valueOf(visitorProfile, MpVisitor::getVisitorMobile)));
        payload.put("workUnit", firstNonBlank(valueOf(visitorProfile, MpVisitor::getVisitorCompany), order.getVisitorOrg()));
        payload.put("carNumber", trimToEmpty(visitor.getPlateNo()));
        payload.put("visitPurpose", trimToEmpty(visitPurpose));
        payload.put("beVisitorPhone", valueOf(visitedUser, MpUser::getMobile));
        payload.put("startTime", formatDateTime(startTime, QR_TIME_FORMATTER));
        payload.put("endTime", formatDateTime(endTime, QR_TIME_FORMATTER));
        payload.put("areas", trimToEmpty(areas));
        payload.put("beVisitorName", firstNonBlank(order.getVisitedUserName(), valueOf(visitedUser, MpUser::getNickName)));
        payload.put("date", formatDateTime(qrGenerateTime, QR_DATE_FORMATTER));
        payload.put("validTime", VALID_TIME_PREFIX + Math.max(validMinutes, 1));
        payload.put("codeId", trimToEmpty(codeId));
        try {
            String json = objectMapper.writeValueAsString(payload);
            log.info(
                    "Hikvision payload prepared orderId={} mpVisitorId={} codeId={} generateTime={} expireTime={} payload={}",
                    order.getId(),
                    visitor.getMpVisitorId(),
                    codeId,
                    qrGenerateTime,
                    qrExpireTime,
                    toSafePayloadLog(payload));
            return json;
        } catch (JsonProcessingException ex) {
            throw new IllegalStateException("二维码内容生成失败", ex);
        }
    }

    public String encryptQrcodePayload(String plainPayload) {
        if (!StringUtils.hasText(plainPayload) || !plainPayload.trim().startsWith("{")) {
            return plainPayload;
        }
        if (!properties.isEncryptEnabled()) {
            return plainPayload;
        }
        if (!isValidAesConfig()) {
            throw new BizException(BizErrorCode.CONFIG_NOT_FOUND, "二维码加密配置无效");
        }
        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            SecretKeySpec keySpec =
                    new SecretKeySpec(properties.getAesKey().getBytes(StandardCharsets.UTF_8), "AES");
            IvParameterSpec ivSpec =
                    new IvParameterSpec(properties.getAesIv().getBytes(StandardCharsets.UTF_8));
            cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
            byte[] encrypted = cipher.doFinal(plainPayload.getBytes(StandardCharsets.UTF_8));
            return Base64.getEncoder().encodeToString(encrypted);
        } catch (BizException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new BizException(BizErrorCode.CONFIG_NOT_FOUND, "二维码加密配置无效");
        }
    }

    private boolean isValidAesConfig() {
        return properties.getAesKey() != null
                && properties.getAesIv() != null
                && properties.getAesKey().getBytes(StandardCharsets.UTF_8).length == 16
                && properties.getAesIv().getBytes(StandardCharsets.UTF_8).length == 16;
    }

    private Map<String, Object> toSafePayloadLog(Map<String, Object> payload) {
        Map<String, Object> safe = new LinkedHashMap<>(payload);
        safe.put("visitorIdCard", maskIdCardForLog(safe.get("visitorIdCard")));
        safe.put("visitorPhone", maskMobileForLog(safe.get("visitorPhone")));
        safe.put("beVisitorPhone", maskMobileForLog(safe.get("beVisitorPhone")));
        return safe;
    }

    private String maskIdCardForLog(Object value) {
        String text = value == null ? "" : String.valueOf(value).trim();
        return StringUtils.hasText(text) ? SensitiveDataUtil.maskIdCard(text) : EMPTY;
    }

    private String maskMobileForLog(Object value) {
        String text = value == null ? "" : String.valueOf(value).trim();
        return StringUtils.hasText(text) ? MobileMaskUtil.mask(text) : EMPTY;
    }

    private LocalDateTime resolveVisitStartTime(AppointmentOrder order) {
        LocalDate visitDate = firstNonNull(order.getVisitStartDate(), order.getVisitEndDate(), LocalDate.now());
        if (!AppointmentBizConstants.TIME_MODE_MULTI.equalsIgnoreCase(trimToEmpty(order.getVisitTimeMode()))) {
            String slot = trimToEmpty(order.getVisitTimeSlot()).toUpperCase();
            if (AppointmentBizConstants.TIME_SLOT_PM.equals(slot)) {
                return LocalDateTime.of(visitDate, LocalTime.of(12, 0));
            }
        }
        return LocalDateTime.of(visitDate, LocalTime.MIN);
    }

    private LocalDateTime resolveVisitEndTime(AppointmentOrder order) {
        LocalDate visitDate = firstNonNull(order.getVisitEndDate(), order.getVisitStartDate(), LocalDate.now());
        if (!AppointmentBizConstants.TIME_MODE_MULTI.equalsIgnoreCase(trimToEmpty(order.getVisitTimeMode()))) {
            String slot = trimToEmpty(order.getVisitTimeSlot()).toUpperCase();
            if (AppointmentBizConstants.TIME_SLOT_AM.equals(slot)) {
                return LocalDateTime.of(visitDate, LocalTime.of(11, 59, 59));
            }
        }
        return LocalDateTime.of(visitDate, LocalTime.of(23, 59, 59));
    }

    private String formatDateTime(LocalDateTime value, DateTimeFormatter formatter) {
        return value == null ? EMPTY : value.format(formatter);
    }

    private String trimToEmpty(String value) {
        return value == null ? EMPTY : value.trim();
    }

    private String firstNonBlank(String... values) {
        if (values == null) {
            return EMPTY;
        }
        for (String value : values) {
            if (StringUtils.hasText(value)) {
                return value.trim();
            }
        }
        return EMPTY;
    }

    @SafeVarargs
    private final <T> T firstNonNull(T... values) {
        if (values == null) {
            return null;
        }
        for (T value : values) {
            if (value != null) {
                return value;
            }
        }
        return null;
    }

    private <T> String valueOf(T source, StringGetter<T> getter) {
        if (source == null) {
            return EMPTY;
        }
        String value = getter.get(source);
        return StringUtils.hasText(value) ? value.trim() : EMPTY;
    }

    @FunctionalInterface
    private interface StringGetter<T> {
        String get(T source);
    }
}