import { StoccaTreDbConn } from "../../database.ts";
import StoccaTreRequest, { RouteDefinition } from "../../StoccaTreRequest.ts";
import {Result, StoccaTreError} from "../../Result.ts";
import { JSONObject } from "../../JSON.ts";
import UserCollection from "./UserCollection.ts";
import { UserSchemaWithoutId } from "./UserModel.ts";

export default class UserResource {
    private dbConnection: StoccaTreDbConn;
    private collection: UserCollection;
    private routes: Readonly<Record<string, RouteDefinition>> = {
        Add: {
            pattern: /\/add/,
            method: "POST",
        },
        GetAll: {
            pattern: /\/all/,
            method: "GET",
        },
    } as const;

    constructor(dbConnection: StoccaTreDbConn) {
        this.dbConnection = dbConnection;
        this.collection = new UserCollection(dbConnection);
    }

    async handleRequest(request: StoccaTreRequest): Promise<Result<JSONObject> | null> {
        if (request.match(this.routes.Add)) {
            return await this.addUser(request);
        }
        if (request.match(this.routes.GetAll)) {
            return await this.allUsers(request);
        }
        return null;
    }

    private async addUser(request: StoccaTreRequest): Promise<Result<{ id: number }>> {
        const user = UserSchemaWithoutId.safeParse(request.body);
        if (!user.success) {
            return [new StoccaTreError("User definition was malformed.", 400)];
        }
        return await this.collection.addUser(user.data);
    }

    private async allUsers(request: StoccaTreRequest): Promise<Result<JSONObject>> {
        const [error, result] = await this.collection.getAllUsers();
        if (error) {
            return [error];
        }
        return [, { users: result }];
    }
}