import {
    HttpStatusCode,
    IHttp,
    IModify,
    IPersistence,
    IRead,
} from "@rocket.chat/apps-engine/definition/accessors";
import {
    ApiEndpoint,
    IApiEndpointInfo,
    IApiRequest,
    IApiResponse,
} from "@rocket.chat/apps-engine/definition/api";
import crypto = require("crypto");
import { SCIMError, SCIMErrorType } from "./scim/Error";
import { SCIMListResponse } from "./scim/ListResponse";
import { SCIMUser } from "./scim/User";

export class UsersEndpoint extends ApiEndpoint {
    public path = "Users";

    public async get(
        request: IApiRequest,
        endpoint: IApiEndpointInfo,
        read: IRead,
        modify: IModify,
        http: IHttp,
        persis: IPersistence
    ): Promise<IApiResponse> {
        const list = new SCIMListResponse();
        try {
            const response = await http.get(
                `http://localhost:3000/api/v1/users.list?query={"type":{"$eq":"user"}}&fields={"createdAt":1}`,
                {
                    headers: {
                        ...(await this.getAuthHeaders(read)),
                        "Content-Type": "application/json",
                    },
                }
            );
            if (!response.content) {
                throw new Error("Empty response");
            }
            const o = JSON.parse(response.content);
            if (!o.success) {
                throw new Error(o.error);
            }
            list.Resources = o.users.map(SCIMUser.fromRC);
            list.totalResults = o.total;
        } catch (e) {
            const err = new SCIMError();
            err.scimType = SCIMErrorType.INVALID_VALUE;
            err.detail = e.message;
            err.status = "400";
            return err.toApiResponse();
        }
        return {
            headers: {
                "Content-Type": "application/scim+json",
            },
            status: HttpStatusCode.OK,
            content: list,
        };
    }

    public async post(
        request: IApiRequest,
        endpoint: IApiEndpointInfo,
        read: IRead,
        modify: IModify,
        http: IHttp,
        persis: IPersistence
    ): Promise<IApiResponse> {
        let user = request.content;
        try {
            const response = await http.post(
                `http://localhost:3000/api/v1/users.create`,
                {
                    headers: {
                        ...(await this.getAuthHeaders(read)),
                        "Content-Type": "application/json",
                    },
                    content: JSON.stringify(
                        this.scimToUserCreate(SCIMUser.fromPlain(user))
                    ),
                }
            );
            if (!response.content) {
                throw new Error("Empty response");
            }
            const o = JSON.parse(response.content);
            if (!o.success) {
                throw new Error(o.error);
            }
            user = SCIMUser.fromRC(o.user);
        } catch (e) {
            const err = new SCIMError();
            err.scimType = SCIMErrorType.INVALID_VALUE;
            err.detail = e.message;
            err.status = "400";
            return err.toApiResponse();
        }
        return {
            headers: {
                "Content-Type": "application/scim+json",
            },
            status: HttpStatusCode.CREATED,
            content: user,
        };
    }

    private async getAuthHeaders(
        read: IRead
    ): Promise<{ [key: string]: string }> {
        return {
            "X-User-Id": await read
                .getEnvironmentReader()
                .getSettings()
                .getValueById("rc-user-id"),
            "X-Auth-Token": await read
                .getEnvironmentReader()
                .getSettings()
                .getValueById("rc-token"),
        };
    }

    private scimToUserCreate(user: SCIMUser): IUserCreate {
        return {
            email: user.emails[0].value,
            name: user.displayName,
            username: user.userName,
            password: crypto.randomBytes(64).toString("base64").slice(0, 64),
            verified: true,
            customFields: {
                scimExternalId: user.externalId,
            },
        };
    }
}