use std::{env, fs, io::{self, stdin, Read, Write}, path::Path};
fn main() {
    let mut rblxpath = String::new();
    if let Some(lad) = env::var("LOCALAPPDATA").ok() {
        let temprbx_lad = format!("{}\\Roblox", lad);
        if Path::new(&temprbx_lad).is_dir() {
            rblxpath = temprbx_lad;
        }
    } else if let Some(pfx86) = env::var("ProgramFiles(x86)").ok() {
        let temprbx_pfx86 = format!("{}\\Roblox", pfx86);
        if Path::new(&temprbx_pfx86).is_dir() {
            rblxpath = temprbx_pfx86;
        }
    }
    if rblxpath != "" {
        println!("Found path: {}", rblxpath);
    } else {
        println!("Roblox not found (Die)");
        return;
    }
    println!("What FPS would you like to cap the fps to? (0 for no cap at all)");
    let _ = io::stdout().flush();
    let mut input = String::new();
    stdin().read_line(&mut input).expect("invalid input, try again");
    if let Some('\n')=input.chars().next_back() {
        input.pop();
    }
    if let Some('\r')=input.chars().next_back() {
        input.pop();
    }
    let fps = input.parse::<i32>().unwrap();
    let desired_fps = match fps {
    	0 => 5588562,
     	_ => fps
    };
    println!("fps cap will be set to {desired_fps}");
    let just_make_this_work = format!("{{\"FFlagHandleAltEnterFullscreenManually\":\"False\",\"DFIntTaskSchedulerTargetFps\":{desired_fps},\"FFlagEnableInGameMenuChromeABTest3\":\"False\",\"FFlagGameBasicSettingsFramerateCap5\":\"False\",\"FFlagTaskSchedulerLimitTargetFpsTo2402\":\"False\"}}");
    let fflag_contents = just_make_this_work.as_str();
    let versions = format!("{}\\Versions\\", rblxpath);
    for folder in fs::read_dir(versions).unwrap() {
        let cur_folder = folder.unwrap().path().display().to_string();
        if cur_folder.to_lowercase().contains("version") {
            let executable = format!("{}\\RobloxPlayerBeta.exe", cur_folder);
            if Path::new(&executable).is_file() {
                let cs_folder = format!("{}\\ClientSettings", cur_folder);
                if !Path::new(&cs_folder).is_dir() {
                    fs::create_dir(&cs_folder).ok();
                    println!("Created ClientSettings folder in {}", cur_folder);
                } else {
                    println!("ClientSettings folder already exists in {}", cur_folder);
                }
                let cas_json = format!("{}\\ClientAppSettings.json", cs_folder);
                fs::write(cas_json, fflag_contents).ok();
                println!("Wrote ClientAppSettings.json to {}", cur_folder)
            }
        }
    }
    println!("Press enter to exit");
    let _ = io::stdin().read(&mut [0u8]).unwrap();
}