module sites.basesite;

import config.downloaderconfig;
import sites.basesiteintf;

/++
+ This is the baseclass which all
+ other site classes inherit from
+/
class BaseSite : BaseSiteIntf
{
protected:
    import std.stdio    : writeln, writefln;
    import std.file     : exists, rmdirRecurse, mkdir;
    import std.json     : parseJSON, JSONValue;
    import std.array    : replace, split;
    import std.string   : indexOf;
    import std.net.curl : download;
    import std.parallelism : parallel;

    Config _config;

    // This function needs to be implemented by each derived site class
    abstract string getNameFromUrl(string url);

    // This function needs to be implemented by each derived site class
    abstract string[] getImageUrlsFromBase(string url);

    /++
    + This function creates a folder with the supplied name.
    + If the folder already exists the folder will get deleted!!
    +/
    void createOuputFolder(string foldername)
    {
        // Check if foler exits already
        if(exists(foldername))
        {
            writefln(`[!] Folder with the name "%s" exists already...`, foldername);
            writeln("[!] Deleting it now!");
            rmdirRecurse(foldername);
        }

        writefln(`[*] Creating folder "%s"`, foldername);
        mkdir(foldername);
    }

    /++
    + This function extracts the name of a file from the supplied url
    +/
    string extractFileNameFromUrl(string url)
    {
        string[] tmpString = url.split("/");
        return tmpString[tmpString.length-1];
    }

    /++
    + This function downloads the images over the
    + url supplied in the `imageUrls` into the `outputPath`
    +/
    void downloadImages(string[] imageUrls, string outputPath)
    {
        foreach(string url; parallel(imageUrls))
        {
            // Extract the filename from the url
            string filepath = outputPath ~ extractFileNameFromUrl(url);

            if(_config.enable_debug_output) writefln("[i] Downloading from %s ==> %s", url, filepath);

            // Download the image
            download(url, filepath);
        }
    }

    /++
    + Downloads a doujin from `url` into the `outputPath`
    +/
    void downloadDoujinFromUrl(string url, string outputPath)
    {
        // Create a folder with the name of the managa
        createOuputFolder(outputPath);

        // Extract the urls of the managa images
        string[] urls = getImageUrlsFromBase(url);

        // Download the images over the extracted urls
        downloadImages(urls, outputPath);

        writeln("[*] Done downloading...");
    }

public:

    /++
    + This constructor is to setup the site class with the
    + supplied `Config`
    +/
    this(Config config)
    {
        // Set the config
        _config = config;
    }

    /++
    + This function downloads a doujin from the supplied url
    +/
    void downloadDoujin(string url)
    {
        // Get the name of the doujin
        string _foldername = _config.standard_download_folder ~ getNameFromUrl(url) ~ "/";

        // Check if the folder already exists and `redownload_mangas_regardless` is set to false
        if(exists(_foldername) && !_config.redownload_mangas_regardless)
        {
            // Then stop downloading
            return;
        }

        if(_config.enable_debug_output) writefln("[i] _foldername is ----> %s", _foldername);

        // Download the doujin into a folder with the name of the doujin
        downloadDoujinFromUrl(url, _foldername);
    }

    /++
    + This function downloads multiple doujins
    +/
    void downloadDoujin(string[] urls)
    {
        foreach(string url; urls)
        {
            // Get the name of the doujin
            string _foldername = _config.standard_download_folder ~ getNameFromUrl(url) ~ "/";

            if(_config.enable_debug_output) writefln("[i] _foldername is :s%", _foldername);

            // Check if the folder already exists and `redownload_mangas_regardless` is set to false
            if(exists(_foldername) && !_config.redownload_mangas_regardless)
            {
                // Then continue to the next url in the list
                continue;
            }

            // Download the doujin into a folder with the name of the doujin
            downloadDoujinFromUrl(url, _foldername);
        }
    }
}