import Database, { CollectionOptions, mockDatabase } from '@tachybase/database';
import { Handlers, ResourceOptions, Resourcer } from '@tachybase/resourcer';

import Koa from 'koa';
import bodyParser from 'koa-bodyparser';
import qs from 'qs';
import supertest, { SuperAgentTest } from 'supertest';

import db2resource from '../../../server/src/middlewares/db2resource';

interface ActionParams {
  fields?: string[];
  filter?: any;
  filterByTk?: any;
  sort?: string[];
  page?: number;
  pageSize?: number;
  values?: any;
  /**
   * @deprecated
   */
  resourceName?: string;
  /**
   * @deprecated
   */
  resourceIndex?: string;
  /**
   * @deprecated
   */
  associatedName?: string;
  /**
   * @deprecated
   */
  associatedIndex?: string;
  [key: string]: any;
}

interface SortActionParams {
  resourceName?: string;
  resourceIndex?: any;
  associatedName?: string;
  associatedIndex?: any;
  sourceId?: any;
  targetId?: any;
  sortField?: string;
  method?: string;
  target?: any;
  sticky?: boolean;
  [key: string]: any;
}

interface Resource {
  get: (params?: ActionParams) => Promise<supertest.Response>;
  list: (params?: ActionParams) => Promise<supertest.Response>;
  create: (params?: ActionParams) => Promise<supertest.Response>;
  update: (params?: ActionParams) => Promise<supertest.Response>;
  destroy: (params?: ActionParams) => Promise<supertest.Response>;
  sort: (params?: SortActionParams) => Promise<supertest.Response>;
  [name: string]: (params?: ActionParams) => Promise<supertest.Response>;
}

export class MockServer extends Koa {
  db: Database;
  resourcer: Resourcer;

  constructor() {
    super();
    this.db = mockDatabase({
      sync: {
        force: true,
      },
    });
    this.resourcer = new Resourcer({
      prefix: '/api',
    });
    this.use(async (ctx, next) => {
      ctx.db = this.db;
      ctx.resourcer = this.resourcer;
      await next();
    });
    this.use(bodyParser());
    this.use(db2resource);
    this.use(
      this.resourcer.restApiMiddleware({
        prefix: '/api',
      }),
    );
  }

  collection(options: CollectionOptions) {
    return this.db.collection(options);
  }

  resource(options: ResourceOptions) {
    this.resourcer.define(options);
  }

  async destroy() {
    return this.db.close();
  }

  actions(handlers: Handlers) {
    this.resourcer.registerActionHandlers(handlers);
  }

  agent(): SuperAgentTest & { resource: (name: string, resourceOf?: any) => Resource } {
    const agent = supertest.agent(this.callback());
    const prefix = this.resourcer.options.prefix;
    const proxy = new Proxy(agent, {
      get(target, method: string, receiver) {
        if (method === 'resource') {
          return (name: string, resourceOf?: any) => {
            const keys = name.split('.');
            const proxy = new Proxy(
              {},
              {
                get(target, method: string, receiver) {
                  return (params: ActionParams = {}) => {
                    let { filterByTk } = params;
                    const { values = {}, file, ...restParams } = params;
                    if (params.associatedIndex) {
                      resourceOf = params.associatedIndex;
                    }
                    if (params.resourceIndex) {
                      filterByTk = params.resourceIndex;
                    }
                    let url = prefix;
                    if (keys.length > 1) {
                      url += `/${keys[0]}/${resourceOf}/${keys[1]}`;
                    } else {
                      url += `/${name}`;
                    }
                    url += `:${method as string}`;
                    if (filterByTk) {
                      url += `/${filterByTk}`;
                    }

                    switch (method) {
                      case 'upload':
                        return agent
                          .post(`${url}?${qs.stringify(restParams)}`)
                          .attach('file', file)
                          .field(values);
                      case 'list':
                      case 'get':
                        return agent.get(`${url}?${qs.stringify(restParams)}`);
                      default:
                        return agent.post(`${url}?${qs.stringify(restParams)}`).send(values);
                    }
                  };
                },
              },
            );
            return proxy;
          };
        }
        return (...args: any[]) => {
          return agent[method](...args);
        };
      },
    });
    return proxy as any;
  }
}

export function mockServer() {
  return new MockServer();
}
