import { IQueryParams } from "./IQueryParams";
import { ProfileManager } from "../Profile/ProfileManager";
import SwrveLogger from "../utils/SwrveLogger";
import { ISwrveInternalConfig } from "../Config/ISwrveInternalConfig";
import IResourceDiff from "../WebApi/Resources/IResourceDiff";
import IRestResponse from "./IRestResponse";
import { IPlatform } from "../utils/platforms/IPlatform";
import IEventBatch from "../WebApi/Events/IEventBatch";
import SwrveEvent from "../WebApi/Events/SwrveEvent";
import IIdentityParams from "../WebApi/Identity/IIdentityParams";
import IdentityResponse from "../WebApi/Identity/IIdentityResponse";

export class SwrveRestClient {
    public readonly version: number = 3;
    public readonly apiVersion: string = "8";
    public readonly inAppVersion: string = "10";
    public readonly embeddedVersion: string = "1";

    public constructor(
        private readonly config: ISwrveInternalConfig,
        private readonly profileManager: ProfileManager,
        private readonly platform: IPlatform,
    ) {}

    public postEvents(events: ReadonlyArray<SwrveEvent>): Promise<Response | Error | void> {
        const appId = this.config.appId;
        const stack = this.config.stack === "us" ? "api" : "eu-api";
        const url =
            this.config.contentUrl == null ? `https://${appId}.${stack}.swrve.com/1/batch` : this.config.contentUrl;

        const body: IEventBatch = {
            user: this.profileManager.currentUser.userId,
            app_version: this.config.appVersion,
            session_token: this.profileManager.getSessionToken(),
            version: this.version,
            unique_device_id: this.platform.deviceID,
            data: events,
        };

        return this.fetch(url, {
            body: JSON.stringify(body),
            cache: "no-cache",
            method: "POST",
            headers: {
                "content-type": "application/json",
            },
        });
    }

    public getCampaignsAndResources(): Promise<any> {
        const appId = this.config.appId;
        const stack = this.config.stack === "us" ? "content" : "eu-content";
        const url =
            this.config.apiUrl == null ? `https://${appId}.${stack}.swrve.com/api/1/user_content?` : this.config.apiUrl;
        const query = this.getQueryString(this.profileManager.currentUser.etag);

        SwrveLogger.debug("campaignsAndResourcesUrl: " + url + query);

        return this.fetch(url + query)
            .then((response) =>
                response.json().then((json) => ({
                    json,
                    etag: response.headers.get("ETag"),
                })),
            )
            .catch((error) => {
                throw error;
            });
    }

    public identify(externalUserId: string, swrveId: string): Promise<IdentityResponse> {
        const appId = this.config.appId;
        const stack = this.config.stack === "us" ? "identity" : "eu-identity";
        const url =
            this.config.identityUrl == null ? `https://${appId}.${stack}.swrve.com/identify` : this.config.identityUrl;
        const body: IIdentityParams = {
            api_key: this.config.apiKey,
            swrve_id: swrveId,
            external_user_id: externalUserId,
            unique_device_id: this.platform.deviceID,
        };

        return this.fetch(url, {
            body: JSON.stringify(body),
            cache: "no-cache",
            method: "POST",
            headers: {
                "Content-Type": "application/json",
            },
        })
            .then((response) => {
                if (response && response.ok) {
                    return response.json();
                } else {
                    throw new Error("Error " + response + " statusText:" + (response && response.statusText));
                }
            })
            .catch((error) => {
                SwrveLogger.debug(error);
                throw error;
            });
    }

    public getUserResourcesDiff(): Promise<IRestResponse<ReadonlyArray<IResourceDiff>>> {
        const appId = this.config.appId;
        const stack = this.config.stack === "us" ? "content" : "eu-content";
        const url =
            this.config.apiUrl == null
                ? `https://${appId}.${stack}.swrve.com/api/1/user_resources_diff?`
                : this.config.apiUrl;
        const query = this.getQueryString();

        SwrveLogger.info("url+query " + url + query);

        return this.fetch(url + query).then((response) =>
            response.json().then((json: ReadonlyArray<IResourceDiff>) => ({
                json,
                etag: response.headers.get("ETag"),
            })),
        );
    }

    public getQueryString(etag?: string): string {
        const esc = encodeURIComponent;
        const params: IQueryParams = this.getContentRequestParams();

        const query = Object.keys(params)
            .filter((key) => (<any>params)[key] != null)
            .map((k) => esc(k) + "=" + esc((<any>params)[k]))
            .join("&");

        const etagParam = etag ? "&etag=" + etag : "";
        const sessionToken = this.profileManager!.getSessionToken();
        const sessionTokenParam =  sessionToken ? "&session_token=" + sessionToken : "";
        return query + etagParam + sessionTokenParam;
    }

    public getContentRequestParams(): IQueryParams {
        const params: IQueryParams = {
            api_key: this.config.apiKey,
            user: this.profileManager.currentUser.userId,
            app_version: this.config.appVersion,
            joined: this.profileManager.currentUser.firstUse.toString(),
            version: this.apiVersion,
            in_app_version: this.inAppVersion,
            embedded_campaign_version: this.embeddedVersion,
            language: this.platform.language,
            app_store: this.platform.appStore,
            device_width: this.platform.screenWidth.toString(),
            device_height: this.platform.screenHeight.toString(),
            device_dpi: this.platform.screenDPI.toString(),
            device_name: this.platform.deviceID,
            device_type: "tv",
            os: this.platform.os,
            os_version: this.platform.osVersion,
            orientation: "landscape",
        };

        return params;
    }

    public fetch(input: string | Request, init?: RequestInit): Promise<Response> {
        const timeout = this.config.httpsTimeoutSeconds;
        let controller: AbortController;
        let signal;
        if ("AbortController" in window) {
            controller = new AbortController();
            signal = controller.signal;
        }

        return Promise.race([
            fetch(input, { ...init, signal }),
            new Promise((_, reject) => {
                setTimeout(() => {
                    reject(new Error("Request timeout after " + timeout + " seconds"));
                    if (controller) {
                        controller.abort();
                    }
                }, timeout * 1000);
            }) as Promise<Response>,
        ]);
    }
}