use crate::config::CONFIG;
use crate::errors::AppError;
use axum::{
    extract::{Multipart, Path},
    http::header::{HeaderMap, HeaderName, HeaderValue},
};
use std::fs::read;

use rand::random;

/// Upload a file. Returns an `AppError` or the path of the uploaded file
pub async fn upload(
    mut multipart: Multipart,
    allowed_extensions: Vec<&str>,
) -> Result<String, AppError> {
    let mut uploaded_file = String::new();

    if let Some(file) = multipart.next_field().await.unwrap() {
        let content_type = file.content_type().unwrap().to_string();

        let index = content_type.find('/').unwrap_or(usize::max_value());
        let mut ext_name = "xxx";
        if index != usize::max_value() {
            ext_name = &content_type[index + 1..];
        }

        if allowed_extensions
            .iter()
            .any(|&x| x.to_lowercase() == ext_name)
        {
            let rnd = (random::<f32>() * 1000000000 as f32) as i32;

            let save_filename = format!("{}/{}.{}", CONFIG.save_file_base_path, rnd, ext_name);
            uploaded_file = format!("{}/{}.{}", CONFIG.uploads_endpoint, rnd, ext_name);

            let data = file.bytes().await.unwrap();

            tokio::fs::write(&save_filename, &data)
                .await
                .map_err(|err| err.to_string())?;
        }
    }

    if !uploaded_file.is_empty() {
        return Ok(uploaded_file);
    }

    Err(AppError::BadRequest(
        "File extension not supported".to_string(),
    ))
}

/// Axum endpoint which shows uploaded file
pub async fn show_uploads(Path(id): Path<String>) -> (HeaderMap, Vec<u8>) {
    let index = id.find('.').unwrap_or(usize::max_value());

    let mut ext_name = "xxx";
    if index != usize::max_value() {
        ext_name = &id[index + 1..];
    }
    let mut headers = HeaderMap::new();

    if vec!["jpg", "jpeg", "png", "gif", "webp"]
        .iter()
        .any(|&x| x == ext_name)
    {
        let content_type = format!("image/{}", ext_name);
        headers.insert(
            HeaderName::from_static("content-type"),
            HeaderValue::from_str(&content_type).unwrap(),
        );
    }
    let file_name = format!("{}/{}", CONFIG.save_file_base_path, id);
    (headers, read(&file_name).unwrap())
}