package jnpf.dmsEntity.watermark;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import jnpf.exception.DataException;
import lombok.Data;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.LinkedHashSet;

/** Runtime barcode entries shared by preview, download and print, in caller-specified order. */
@Data
public class DmsWatermarkParameters {
    public static final String CUSTOM_BARCODE_TEMPLATE = "{/CUSTOM_BARCODE_TEXT}";
    private List<CustomBarcode> customBarcode;
    private List<String> watermarkBusinessTypes;

    public DmsWatermarkParameters normalized() {
        DmsWatermarkParameters result = new DmsWatermarkParameters();
        if (watermarkBusinessTypes != null) {
            if (watermarkBusinessTypes.size() > 50) throw new DataException("水印业务类型不能超过 50 项");
            LinkedHashSet<String> types = new LinkedHashSet<>();
            for (String value : watermarkBusinessTypes) {
                if (value == null || value.isBlank() || value.length() > 100 || !value.equals(value.trim())) {
                    throw new DataException("水印业务类型取值无效");
                }
                types.add(value);
            }
            result.setWatermarkBusinessTypes(new ArrayList<>(types));
        }
        if (customBarcode != null) {
            if (customBarcode.isEmpty()) throw new DataException("customBarcode 数组不能为空；不需要自定义条码时请省略该参数");
            if (customBarcode.size() > 10000) throw new DataException("自定义条码数组不能超过 10000 项");
            List<CustomBarcode> entries = new ArrayList<>();
            for (CustomBarcode item : customBarcode) {
                if (item == null) throw new DataException("自定义条码数组不能包含空项");
                if (item.getPage() != null && item.getPage() < 1) {
                    throw new DataException("水印页码必须是从 1 开始的正整数；省略 page 表示每页渲染");
                }
                validateText(item.getBarValue(), "条码内容 barValue");
                validateText(item.getBarText(), "条码显示文字 barText");
                CustomBarcode copy = new CustomBarcode();
                copy.setPage(item.getPage());
                copy.setBarValue(item.getBarValue());
                copy.setBarText(item.getBarText());
                entries.add(copy);
            }
            result.setCustomBarcode(entries);
        }
        return result;
    }

    private static void validateText(String text, String label) {
        if (text == null || text.isBlank()) throw new DataException(label + "不能为空");
        if (text.length() > 2000) throw new DataException(label + "不能超过 2000 个字符");
    }

    @Data
    public static class CustomBarcode {
        /** Null means every physical page. Repeated page entries are intentionally retained. */
        @JsonDeserialize(using = PageNumberDeserializer.class)
        private Integer page;
        private String barValue;
        private String barText;
    }

    /** Do not let Jackson silently truncate 1.5 or coerce "2" into an integer page. */
    public static class PageNumberDeserializer extends JsonDeserializer<Integer> {
        @Override
        public Integer deserialize(JsonParser parser, DeserializationContext context) throws IOException {
            if (!parser.hasToken(JsonToken.VALUE_NUMBER_INT)) {
                return (Integer) context.handleUnexpectedToken(Integer.class, parser);
            }
            return parser.getIntValue();
        }
    }
}