package jnpf.dmsService;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import jnpf.exception.DataException;
import java.util.*;

/** Native organizeSelect values; deliberately rejects users, positions and unresolved dynamic parameters. */
public final class DmsApprovedDepartmentScope {
    private static final ObjectMapper JSON = new ObjectMapper();
    public record Department(String id, String scope) {}
    private DmsApprovedDepartmentScope() {}

    public static List<Department> parse(String value) {
        if (value == null || value.isBlank()) return List.of();
        try {
            JsonNode array = JSON.readTree(value);
            // Native empty selections can be SQL NULL or serialized JSON null.
            if (array == null || array.isNull()) return List.of();
            if (!array.isArray()) throw new DataException("查阅授权部门必须为数组");
            Map<String, Department> departments = new TreeMap<>();
            for (JsonNode node : array) {
                if (!node.isTextual()) throw new DataException("查阅授权部门必须为ID字符串");
                String token = node.textValue().trim();
                String id = token, scope = "SELF";
                int separator = token.indexOf("--");
                if (separator >= 0) {
                    id = token.substring(0, separator);
                    scope = switch (token.substring(separator + 2)) {
                        case "org" -> "SELF";
                        case "subOrg" -> "CHILDREN";
                        case "progenyOrg" -> "DESCENDANTS";
                        default -> throw new DataException("查阅授权仅支持部门及部门下级范围");
                    };
                }
                if (id.isBlank() || id.length() > 100 || id.startsWith("@") || !id.equals(id.trim())
                        || id.chars().anyMatch(Character::isWhitespace))
                    throw new DataException("查阅授权部门ID无效");
                Department candidate = new Department(id, scope);
                Department old = departments.get(id);
                if (old == null || rank(candidate.scope()) > rank(old.scope())) departments.put(id, candidate);
            }
            return List.copyOf(departments.values());
        } catch (DataException ex) { throw ex; }
        catch (Exception ex) { throw new DataException("查阅授权部门格式无效"); }
    }

    public static String normalize(String value) {
        List<Department> departments = parse(value);
        try {
            return JSON.writeValueAsString(departments.stream().map(d -> d.id() + switch (d.scope()) {
                case "CHILDREN" -> "--subOrg";
                case "DESCENDANTS" -> "--progenyOrg";
                default -> "";
            }).toList());
        } catch (Exception ex) { throw new DataException("无法保存查阅授权部门快照"); }
    }
    private static int rank(String scope) {
        return switch (scope) { case "CHILDREN" -> 1; case "DESCENDANTS" -> 2; default -> 0; };
    }
}