# Download YouTube video thumbnail to file

hideconsole;

require "input";
require "strings";
require "forms";

global wndstyles int;
global frmMain int;
global bFormRes bool;
global szVideoUrl string;
set szVideoUrl <= "";

function downloadToFile bool(url string, dest string)
{
    result false;
    
    local iSubStr int;
    local szIdent string;
    local szVideo string;
    
    s_find "%url" "?v=" iSubStr;

    if (%iSubStr, -gre, 0) {
        += iSubStr 3;
        s_substr "%url" "%iSubStr" "-1" "szIdent";
        
        set szVideo <= "https://img.youtube.com/vi/%szIdent/maxresdefault.jpg";
        
        sys { curl -o "%dest" "%szVideo"  --silent } szResponse;
        
        result true;
    };
};

function btnSaveVideoThumbnail_OnClick void()
{
    local szTxtVideoUrl string;
    local szTxtDestPath string;
    local bDownloadResult bool;
    
    wnd_gettextboxtext frmMain txtVideoUrl szTxtVideoUrl;
    wnd_gettextboxtext frmMain txtSaveDest szTxtDestPath;
    
    call downloadToFile("%szTxtVideoUrl", "%szTxtDestPath") => bDownloadResult;
    
    if (%bDownloadResult, -eq, true) {
        wnd_setcomptext "frmMain" "CLabel" "lblResult" "Success!";
    } else {
        wnd_setcomptext "frmMain" "CLabel" "lblResult" "Error...";
    };
};

bitop "or" (%WS_OVERLAPPED, %WS_SYSMENU, %WS_VISIBLE) wndstyles;

wnd_spawnform "frmMain" "Download YouTube Thumbnail" 200 300 500 250 %wndstyles frmMain;

wnd_isformvalid frmMain bFormRes;

if (%bFormRes, -eq, false) {
    print "Failed to create form.";
    pause;
    exit;
};

wnd_spawnlabel frmMain "lblVideoUrl" 20 10 50 20 "URL: ";
wnd_spawntextbox frmMain "txtVideoUrl" 20 35 450 20 "https://www.youtube.com/watch?v=012345";

wnd_spawnlabel frmMain "lblSaveDest" 20 75 50 20 "Dest: ";
wnd_spawntextbox frmMain "txtSaveDest" 20 100 450 20 "%USERPROFILE%\Desktop\maxresdefault.jpg";

wnd_spawnbutton frmMain "btnSaveVideoThumbnail" 20 155 200 30 "Save";

wnd_spawnlabel frmMain "lblResult" 230 160 100 20 " ";

while (%bFormRes, -eq, true) {
    wnd_process;

    wnd_isformvalid frmMain bFormRes;
};