import * as Pont from 'pont-engine';
import { CodeGenerator, Interface, Property, Mod, Surrounding } from 'pont-engine';

/**
 * 生成代码
 */
export default class MyGenerator extends CodeGenerator {
  /**
   * 类型声明 api.d.ts
   */

  /** 获取公共的类型定义代码 */
  // getCommonDeclaration() {
  //   return `
  //   import { RequestOptionsInit } from 'umi-request';
  //   `;
  // }

  /** 获取所有基类的类型定义代码，一个 namespace */
  getBaseClassesInDeclaration() {
    const content = `namespace ${this.dataSource.name || 'defs'} {
      ${this.dataSource.baseClasses
        .map(
          (base) => `
        export ${this.getBaseClassInDeclaration(base)}
      `,
        )
        .join('\n')}
    }
    `;

    return content;
  }

  /** 获取接口内容的类型定义代码 */
  getInterfaceContentInDeclaration(inter: Interface) {
    // 请求体（Body）类型参数列表
    const bodyParams = inter.parameters.filter((param) => param.in === 'body');
    // 路径参数（PathVariable）类型参数列表
    const pathParams = inter.parameters.filter((param) => param.in === 'path');
    // 查询字符串（QueryString）类型参数列表
    const queryParams = inter.parameters.filter((param) => param.in === 'query');

    // 获取请求体类型参数类代码
    const bodyParamsCode = inter.getBodyParamsCode();
    // 获取查询字符串参数类代码
    const paramsCode = inter.getParamsCode();
    // 获取路径参数类代码
    const pathParamsCode = this.getPathParamsCodeInDeclaration(pathParams);

    // 接口方法参数列表
    const requestArgs: string[] = [];

    pathParams.length > 0 && requestArgs.push(`pathParams: PathParams`);
    queryParams.length > 0 && requestArgs.push(`params: Params`);
    bodyParams.length > 0 &&
      requestArgs.push(`bodyParams:${bodyParams.length > 0 ? bodyParamsCode : ''}`);
    requestArgs.push('options?: any');

    const requestParams = requestArgs.join(', ');

    // 返回数据类型
    const { responseType } = inter;

    return `
      ${queryParams.length > 0 ? paramsCode : ''}
      ${pathParams.length > 0 ? pathParamsCode : ''}

      export type ResponseType = Promise<${responseType}>

      export const URL:string;

      export function request(${requestParams}): ResponseType;
    `;
  }

  /**
   * 接口实现 /mods/<module_name>/<method_name>.ts
   */

  /** 获取接口实现内容的代码 */
  getInterfaceContent(inter: Interface) {
    // 接口请求类型
    const method = inter.method.toUpperCase();

    // 请求体（Body）类型参数列表
    const bodyParams = inter.parameters.filter((param) => param.in === 'body');
    // 路径参数（PathVariable）类型参数列表
    const pathParams = inter.parameters.filter((param) => param.in === 'path');
    // 查询字符串（QueryString）类型参数列表
    const queryParams = inter.parameters.filter((param) => param.in === 'query');

    // 获取请求体类型参数类代码
    const bodyParamsCode = inter.getBodyParamsCode();
    // 获取查询字符串参数类代码
    const paramsCode = this.getParamsCode(queryParams);
    // 获取路径参数类代码
    const pathParamsCode = this.getPathParamsCode(pathParams);

    // 请求的 MIME 类型
    const contentType =
      inter.consumes && inter.consumes.length ? inter.consumes[0] : 'application/json';

    // 接口方法参数列表
    const requestArgs: string[] = [];

    pathParams.length > 0 && requestArgs.push(`pathParams: PathParams`);
    queryParams.length > 0 && requestArgs.push(`params: Params`);
    bodyParams.length > 0 &&
      requestArgs.push(`bodyParams:${bodyParams.length > 0 ? bodyParamsCode : ''}`);
    requestArgs.push('options?: RequestOptionsInit');

    const requestParams = requestArgs.join(', ');

    // 数据源前缀
    let dataSourcePrefix = '';
    if (this.dataSource.name) {
      dataSourcePrefix = `/${this.dataSource.name}`;
    }

    return `
      import fetch from '../../../utils/request';
      import { RequestOptionsInit } from 'umi-request';

      ${pathParams.length > 0 ? `export ${pathParamsCode}` : ''}
      ${queryParams.length > 0 ? `export ${paramsCode}` : ''}

      export const URL = '${dataSourcePrefix}${inter.path}';

      /**
       * @desc ${inter.description}
       */
      export function request (${requestParams}) {
        const fetchOption = Object.assign ({
          method: '${method}',
          headers: {
            'Content-Type': '${contentType}'
          },
          ${queryParams.length > 0 ? 'params: params,' : ''}
          ${bodyParamsCode ? 'data: bodyParams' : ''}
        },
        options)
        return fetch('${dataSourcePrefix}${inter.path}', fetchOption);
      }
      `;
  }

  // 生成参数类（Params）
  getParamsCode(params: Property[]): string {
    if (!Array.isArray(params) || params.length === 0) return '';

    return `
      export class Params {
        ${params
          .map((param) => {
            return `${param.toPropertyCodeWithInitValue('')}`;
          })
          .join('\n')}
      }
    `;
  }

  // 生成路径参数类（PathParams）
  getPathParamsCode(pathParams: Property[]): string {
    if (!Array.isArray(pathParams) || pathParams.length === 0) return '';

    return `
      class PathParams {
        ${pathParams
          .map((param) => {
            return `${param.toPropertyCodeWithInitValue('')}`;
          })
          .join('\n')}
      }
    `;
  }

  // 生成路径参数类（PathParams）
  getPathParamsCodeInDeclaration(pathParams: Property[]): string {
    if (!Array.isArray(pathParams) || pathParams.length === 0) return '';

    return `
      class PathParams {
        ${pathParams
          .map((param) => {
            return `${param.toPropertyCode(Surrounding.typeScript, param.required)}`;
          })
          .join('\n')}
      }
    `;
  }
}