use dioxus::{
    fullstack::{FileStream},
    prelude::*,
};

#[cfg(feature = "server")]
use crate::config::ServerConfig;

use crate::config::ClientConfig;

use std::time::Duration;

use std::fs;
use std::fs::File;
use std::io::Write;
use futures::StreamExt;

use dioxus_primitives::toast::{
    ToastOptions,
    consume_toast
};

pub fn byte_to_human_size(size: u64) -> String {
    let sizes = vec!["B", "KB", "MB", "GB", "TB", "WTFAREYOUDOINGB"];
    let mut current = 0;

    let mut res_size: f64 = size as f64;

    while res_size >= 1000.0 && current < sizes.len() {
        res_size /= 1000.0;
        current += 1;
    }

    ((res_size * 100.0).round() / 100.0).to_string() + " " + sizes[current]
}

#[post("/api/upload")]
async fn upload_file(mut upload: FileStream) -> Result<String, HttpError> {
    let s_config = ServerConfig::load();
    let c_config = ClientConfig::load();

    let mut total_len: u64 = 0;
    let mut error: Option<&str> = None;

    let filename: String = loop {
        let cur = random_string::generate(20, "ABCDEFGHIJKLMNOPQRTSTUVWXYZ0123456789");
        if (!fs::exists(s_config.upload_folder.clone() + &cur).expect("can't check if file exists")) {
            break cur;
        }
    };

    if let Some(size) = upload.size() {
        if size > c_config.upload_max_size.try_into().unwrap() {
            return HttpError::payload_too_large("this file is too large");
        }
    }


    let mut file = match fs::File::create(s_config.upload_folder.clone() + &filename) {
        Ok(val) => { val },
        Err(_) => { return HttpError::internal_server_error("failed to open the output file") }
    };

    while let Some(chunk) = upload.next().await {
        match chunk {
            Ok(bytes) => {
                total_len += bytes.len() as u64;
                if total_len > c_config.upload_max_size.try_into().unwrap() {
                    error = Some("Uploaded file too large");
                    break;
                }

                if file.write(&bytes).is_err() { error == Some("failed write"); break; };
            },
            Err(_) => { error = Some("unknown"); break; }
        }
    }

    match error {
        Some(err)=> {
            file.sync_data();
            fs::remove_file(s_config.upload_folder.clone() + &filename);
            HttpError::internal_server_error(err)?
        }
        None => { Ok(filename) }
    }

}

pub fn build_table(files: Vec<(String, String, Option<Result<String, HttpError>>)>) -> Element {
    rsx! {
        table {
            tr {
                th { "filename" }
                th { "size" }
                th { "url" }
            } 

            { files.iter().map(|file| rsx! {
                tr {
                    td { class: "px-2", "{file.0}" }
                    td { class: "px-2", "{file.1}" }
                    td { class: "px-2", 
                        match &file.2 {
                            Some(res) => { match res {
                                Ok(file_url) => {let url = file_url.clone(); rsx! { input {
                                    type:"button",
                                    onclick: move |_| {
                                        let toast_api = consume_toast();
                                        toast_api
                                            .success(
                                                "Success".to_string(),
                                                ToastOptions::new()
                                                    .description("The url has been copied successfully")
                                                    .duration(Duration::from_secs(5))
                                                    .permanent(false),
                                            );
                                        let _ = web_sys::window().unwrap().navigator().clipboard().write_text(&url);
                                    },
                                    value: "{file_url}"
                                } } },
                                Err(e) => {
                                    let msg = e.message.clone().unwrap();
                                    rsx! { p { "Upload failed, reason : {msg}" } }
                                }
                            } }
                            None => { rsx! { p { "Waiting for file to be uploaded" } } }
                        }
                    }
                }
            }) }
        }
    }
}

#[component]
pub fn Upload() -> Element {
    let config = ClientConfig::load();

    let mut selected : Signal<Vec<(String, String, Option<Result<String, HttpError>>)>> = use_signal(|| vec![]);

    rsx! {
        div { class : "p-2 h-full w-full",
            p { class: "text-4xl font-bold p-1", "Upload a file" }

            form {

                label { for :"file", {
                    if selected.len() == 0 {
                        rsx! { "No file selected" }
                    } else {
                        build_table(selected())
                    }
                } }

                input { id: "file", r#type : "file" ,multiple: false, class : "hidden", oninput: move |e| async move {
                    let file = &e.files()[0];
                    selected.with_mut(|files| {files.push((file.name(), byte_to_human_size(file.size()), None)); } );
                    let idx = selected().len() - 1;
 
                    if file.size() > config.upload_max_size as u64 {
                        //messy but firefox can't handle when server returns early
                        selected.with_mut(|files| { files[idx].2 = Some(HttpError::payload_too_large("This file is too large")) });
                        return ;
                    }
 
                    let res = match upload_file(file.clone().into()).await {
                        Ok(file_id) => {
                            let location = web_sys::window().unwrap().location();
                            let host = location.host().expect("unknown host");
                            let protocol = location.protocol().expect("unknown protocol");
                            Ok(protocol + "//" + &host + "/upload/" + &file_id)
                        },
                        Err(err) => { Err(err) }
                    };
                    selected.with_mut(|files| { files[idx].2 = Some(res) });
                }}
            }
        }
    }
}