use std::fmt;
use reqwest::StatusCode;

use crate::{bots::approved_bot::modules::download::DownloadData, config};

use self::types::{CachedMessage, DownloadFile};

pub mod types;

#[derive(Debug, Clone)]
struct DownloadError {
    status_code: StatusCode
}

impl fmt::Display for DownloadError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Status code is {0}", self.status_code)
    }
}

impl std::error::Error for DownloadError {}

pub async fn get_cached_message(
    download_data: &DownloadData,
) -> Result<CachedMessage, Box<dyn std::error::Error + Send + Sync>> {
    let DownloadData { format, id } = download_data;

    let client = reqwest::Client::new();
    let response = client
        .get(format!(
            "{}/api/v1/{id}/{format}",
            &config::CONFIG.cache_server_url
        ))
        .header("Authorization", &config::CONFIG.cache_server_api_key)
        .send()
        .await;

    let response = match response {
        Ok(v) => v,
        Err(err) => return Err(Box::new(err)),
    };

    let response = match response.error_for_status() {
        Ok(v) => v,
        Err(err) => return Err(Box::new(err)),
    };

    if response.status() != StatusCode::OK {
        return Err(Box::new(DownloadError {
            status_code: response.status()
        }));
    };

    match response.json::<CachedMessage>().await {
        Ok(v) => Ok(v),
        Err(err) => Err(Box::new(err)),
    }
}

pub async fn download_file(
    download_data: &DownloadData,
) -> Result<DownloadFile, Box<dyn std::error::Error + Send + Sync>> {
    let DownloadData { format, id } = download_data;

    let client = reqwest::Client::new();
    let response = client
        .get(format!(
            "{}/api/v1/download/{id}/{format}",
            &config::CONFIG.cache_server_url
        ))
        .header("Authorization", &config::CONFIG.cache_server_api_key)
        .send()
        .await;

    let response = match response {
        Ok(v) => v,
        Err(err) => return Err(Box::new(err)),
    };

    let response = match response.error_for_status() {
        Ok(response) => response,
        Err(err) => return Err(Box::new(err)),
    };

    if response.status() != StatusCode::OK {
        return Err(Box::new(DownloadError {
            status_code: response.status()
        }));
    };

    let headers = response.headers();

    log::info!("{:?}", headers);

    let filename = headers
        .get("content-disposition")
        .unwrap()
        .to_str()
        .unwrap()
        .replace('"', "")
        .split("filename=")
        .collect::<Vec<&str>>()
        .get(1)
        .unwrap()
        .to_string();
    let caption = std::str::from_utf8(
        &base64::decode(headers.get("x-caption-b64").unwrap()).unwrap(),
    )
    .unwrap()
    .to_string();

    Ok(DownloadFile {
        response,
        filename,
        caption,
    })
}