seclusion/plop/utils/relation-parser.ts

/**
 * 关联关系 DSL 解析器
 *
 * DSL 格式：
 * - 关联关系: 关联名:目标模型 字段1,字段2,... [noList]
 * - 多对多: 关系名:中间表:外键:目标键:目标模型 字段1,字段2,...
 */

/**
 * 关联关系配置
 */
export interface RelationConfig {
  /** 关联名，如 'class' */
  name: string;
  /** 目标模型 PascalCase，如 'Class' */
  model: string;
  /** 目标模型 camelCase，如 'class' */
  modelCamel: string;
  /** select 字段列表 */
  selectFields: string[];
  /** 是否在列表中包含（默认 true） */
  includeInList: boolean;
}

/**
 * 多对多关系<E585B3><E7B3BB><EFBFBD>置
 */
export interface ManyToManyConfig {
  /** 关系名，如 'teachers' */
  name: string;
  /** 中间表名，如 'classTeacher' */
  through: string;
  /** 当前实体外键，如 'classId' */
  foreignKey: string;
  /** 目标实体外键，如 'teacherId' */
  targetKey: string;
  /** 目标模型 camelCase，如 'teacher' */
  target: string;
  /** 目标模型 PascalCase，如 'Teacher' */
  targetModel: string;
  /** 目标实体 select 字段列表 */
  selectFields: string[];
}

/**
 * 解析关联关系 DSL
 *
 * @example
 * 输入:
 * ```
 * class:Class id,code,name
 * headTeacher:Teacher id,teacherNo,name,subject noList
 * ```
 *
 * 输出:
 * [
 *   { name: 'class', model: 'Class', selectFields: ['id', 'code', 'name'], includeInList: true },
 *   { name: 'headTeacher', model: 'Teacher', selectFields: ['id', 'teacherNo', 'name', 'subject'], includeInList: false },
 * ]
 */
export function parseRelations(dsl: string): RelationConfig[] {
  const lines = dsl
    .split('\n')
    .map((line) => line.trim())
    .filter((line) => line && !line.startsWith('#'));

  const relations: RelationConfig[] = [];

  for (const line of lines) {
    // 匹配格式: 关联名:目标模型 字段1,字段2,... [noList]
    const match = line.match(/^(\w+):(\w+)\s+([\w,]+)(?:\s+(noList))?$/);
    if (!match) {
      console.warn(`无法解析关联配置行: ${line}`);
      continue;
    }

    const [, name, model, fieldsStr, noListFlag] = match;
    const selectFields = fieldsStr.split(',').map((f) => f.trim());

    relations.push({
      name,
      model,
      modelCamel: model.charAt(0).toLowerCase() + model.slice(1),
      selectFields,
      includeInList: !noListFlag,
    });
  }

  return relations;
}

/**
 * 解析多对多关系 DSL
 *
 * @example
 * 输入:
 * ```
 * teachers:classTeacher:classId:teacherId:Teacher id,teacherNo,name,subject
 * ```
 *
 * 输出:
 * [
 *   {
 *     name: 'teachers',
 *     through: 'classTeacher',
 *     foreignKey: 'classId',
 *     targetKey: 'teacherId',
 *     target: 'teacher',
 *     targetModel: 'Teacher',
 *     selectFields: ['id', 'teacherNo', 'name', 'subject'],
 *   },
 * ]
 */
export function parseManyToMany(dsl: string): ManyToManyConfig[] {
  const lines = dsl
    .split('\n')
    .map((line) => line.trim())
    .filter((line) => line && !line.startsWith('#'));

  const configs: ManyToManyConfig[] = [];

  for (const line of lines) {
    // 匹配格式: 关系名:中间表:外键:目标键:目标模型 字段1,字段2,...
    const match = line.match(/^(\w+):(\w+):(\w+):(\w+):(\w+)\s+([\w,]+)$/);
    if (!match) {
      console.warn(`无法解析多对多配置行: ${line}`);
      continue;
    }

    const [, name, through, foreignKey, targetKey, targetModel, fieldsStr] = match;
    const selectFields = fieldsStr.split(',').map((f) => f.trim());

    configs.push({
      name,
      through,
      foreignKey,
      targetKey,
      target: targetModel.charAt(0).toLowerCase() + targetModel.slice(1),
      targetModel,
      selectFields,
    });
  }

  return configs;
}

/**
 * 解析统计关系（逗号分隔的字符串）
 *
 * @example
 * 输入: "students, orders"
 * 输出: ['students', 'orders']
 */
export function parseCountRelations(input: string): string[] {
  if (!input || !input.trim()) {
    return [];
  }
  return input
    .split(',')
    .map((s) => s.trim())
    .filter(Boolean);
}

/**
 * 获取字段的 TypeScript 类型（用于生成关联类型）
 * 简化版本，假设大多数字段是 string
 */
export function getFieldType(fieldName: string): string {
  // 常见的非字符串字段
  const numberFields = ['id', 'count', 'amount', 'price', 'quantity', 'sort', 'order'];
  const booleanFields = ['is', 'has', 'can', 'should', 'enabled', 'active', 'visible'];

  if (numberFields.some((f) => fieldName.toLowerCase().includes(f))) {
    return 'number';
  }
  if (booleanFields.some((f) => fieldName.toLowerCase().startsWith(f))) {
    return 'boolean';
  }
  return 'string';
}

/**
 * 生成关联类型的 select 对象字符串
 *
 * @example
 * 输入: ['id', 'code', 'name']
 * 输出: '{ id: true, code: true, name: true }'
 */
export function generateSelectObject(fields: string[]): string {
  const pairs = fields.map((f) => `${f}: true`);
  return `{ ${pairs.join(', ')} }`;
}

/**
 * 生成关联类型定义字符串
 *
 * @example
 * 输入: { name: 'class', selectFields: ['id', 'code', 'name'] }
 * 输出: 'class?: { id: string; code: string; name: string } | null'
 */
export function generateRelationTypeField(config: RelationConfig): string {
  const fieldTypes = config.selectFields.map((f) => `${f}: ${getFieldType(f)}`);
  return `${config.name}?: { ${fieldTypes.join('; ')} } | null`;
}

/**
 * 生成多对多类型定义字符串
 *
 * @example
 * 输入: { name: 'teachers', target: 'teacher', selectFields: ['id', 'name'] }
 * 输出: 'teachers?: Array<{ teacher: { id: string; name: string } }>'
 */
export function generateManyToManyTypeField(config: ManyToManyConfig): string {
  const fieldTypes = config.selectFields.map((f) => `${f}: ${getFieldType(f)}`);
  return `${config.name}?: Array<{ ${config.target}: { ${fieldTypes.join('; ')} } }>`;
}