import Axios from "axios";

export namespace API {
    // Base URL for API queries.
    export let Base_URL = "/api";

    // Types of modifications which can be applied to various models.
    export enum Modification {
        Add, Delete, Refresh
    }

    // Change a channel state.
    export async function channel_modify(youtubeID : string, modify : Modification): Promise<void | string> {
        switch (modify){
            case Modification.Add: {
                let URL = API.Base_URL + '/Channels/' + youtubeID;
                let resp = await Axios.post(URL).catch((error) => {
                    if (error.response)
                        return error.response.data;
                    else if (error.request)
                        return error.request;
                    else
                        return "Axios request failed for unkown reason.";
                });
                if (typeof resp == "string") 
                    return resp;
                break;
            }
            case Modification.Delete: {
                let URL = API.Base_URL + '/Channels/' + youtubeID;
                let resp = await Axios.delete(URL).catch(e => console.log(e));
                if (resp != null){
                    if (resp.status != 200)
                        return resp.data();
                    else
                        return;
                } else {
                    return "Response is null";
                }
            }
            case Modification.Refresh: {
                let URL = API.Base_URL + '/Channels/Update/' + youtubeID;
                let resp = await Axios.post(URL).catch(e => console.log(e));
                if (resp != null){
                    if (resp.status != 200)
                        return resp.data();
                    else
                        return;
                } else {
                    return "Response is null";
                }
            }
            default: {
                console.log("Unknown request type, error ...");
                break;
            }
        }
    }

    // Search for channels based on a search string.
    export async function search_channels(searchstr : string): Promise<Array<Channel>> {
        // Temporary holder for data.
        let Channels : Array<Channel> = [];

        // Ask server for data.
        let resp = await Axios.get(API.Base_URL + '/Channels/' + searchstr).catch(e => console.log(e));

        // Handle all our nulls.
        if (resp == null || resp.data == null)
            console.log("server /api/Channels/" + searchstr +  " return is null");
        else {
            // Parse our videos and add it to the video output.
            resp.data.forEach((c: any) => Channels.push(new Channel(c)));
        }
        
        // Send back the resulting videos.
        return Promise.resolve(Channels);
    }

    // Search for videos based on a search string.
    export async function search_videos(searchstr : string): Promise<Array<Video>> {
        // Temporary holder for videos.
        let Videos : Array<Video> = [];

        // Ask server for videos.
        let resp = await Axios.get(API.Base_URL + '/Videos/' + searchstr).catch(e => console.log(e));

        // Handle all our nulls.
        if (resp == null || resp.data == null)
            console.log("server /videos/ return is null");
        else {
            // Parse our videos.
            resp.data.forEach((v: any) => Videos.push(new Video(v)));
        }
        
        // Send back the resulting videos.
        return Promise.resolve(Videos);
    }
}

// Wrapper for channels returned from our server.
export class Channel {
    // Title of the channel according to youtube.
    public Title: string;

    // Description of channel according to youtube.
    public Description: string;

    // Youtube ID
    public ID: string;

    // Tags given to the video.
    public User_Tags: Array<string>;

    // ID's belonging to the channel.
    public Video_IDs: Array<string>;

    // Popuplate this using data from our server.
    constructor(c : any){
        if (c == null) {
            this.Title = "NULL"
            this.Description = "NULL"
            this.ID = "NULL"
            this.User_Tags = ["NULL", "NULL", "NULL"]
            this.Video_IDs = ["NULL", "NULL"]
        } else {
            this.Title = c.title;
            this.Description = c.description;
            this.ID = c.id;
            this.User_Tags = c.user_Tags;
            this.Video_IDs = c.video_IDs;
        }
    }
}

// Wrapper for videos returned from our server.
export class Video {
    // Title of the video according to youtube.
    public Title: string;

    // Description of video according to youtube.
    public Description: string;

    // Youtube ID
    public ID: string;

    // Thumbnail
    public Thumbnail: string;
    
    // What channel made this video.
    public Channel: string;

    // Duration of the video in seconds.
    public Seconds: number;

    // Tags relevant to the video.
    public Tags: Array<string>;
    
    // Youtube URL of the video.
    public URL: string;

    // Popuplate this using data from our server.
    constructor(v: any){
        if (v == null){
            this.Title = "NULL";
            this.Description = "NULL";
            this.ID = "NULL";
            this.Thumbnail = "NULL";
            this.Channel = "NULL";
            this.Seconds = 9999999;
            this.Tags = ["NULL", "NULL"];
            this.URL = "NULL";
        } else {
            this.Title = v.title;
            this.Description = v.description;
            this.ID = v.id;
            this.Thumbnail = v.thumbnail;
            this.Channel = v.channel;
            this.Seconds = v.seconds;
            this.Tags = v.tags;
            this.URL = "https://www.youtube.com/watch?v=" + v.id;
        }
    }
}