package jnpf.flowable.service.dev;

import jnpf.flowable.model.templatenode.nodejson.NodeModel;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/** Checks saved values, including native child-table field paths. Never fabricates input. */
public final class DevApprovalValidation {
    private DevApprovalValidation() {}

    public static List<String> missing(NodeModel node, Map<String, Object> values) {
        List<String> problems = new ArrayList<>();
        if (node.getFormOperates() == null) return problems;
        for (Map<String, Object> field : node.getFormOperates()) {
            if (!Boolean.TRUE.equals(field.get("required"))) continue;
            String id = String.valueOf(field.get("id"));
            String label = String.valueOf(field.getOrDefault("name", id)).replace('\n', ' ');
            int separator = id.indexOf('-');
            if (separator < 0) {
                if (empty(values.get(id))) problems.add(label + "（" + id + "）");
            } else {
                Object rows = values.get(id.substring(0, separator));
                String column = id.substring(separator + 1);
                if (!(rows instanceof List) || ((List<?>) rows).isEmpty()) {
                    // No rows means there are no child field instances to validate.
                    continue;
                }
                List<?> list = (List<?>) rows;
                for (int i = 0; i < list.size(); i++) {
                    Object row = list.get(i);
                    if (!(row instanceof Map) || empty(((Map<?, ?>) row).get(column))) {
                        problems.add(label + "（第" + (i + 1) + "行，" + id + "）");
                    }
                }
            }
        }
        return problems;
    }

    static boolean empty(Object value) {
        if (value == null) return true;
        if (value instanceof String) {
            String text = ((String) value).trim();
            return text.isEmpty() || "[]".equals(text) || "null".equals(text);
        }
        if (value instanceof Collection) return ((Collection<?>) value).isEmpty();
        if (value instanceof Map) return ((Map<?, ?>) value).isEmpty();
        return value.getClass().isArray() && Array.getLength(value) == 0;
    }
}