use crate::structs;

use std::env;
use std::fs::File;
use std::io::Write;
use tokio::stream::StreamExt;
extern crate serde_json;
extern crate reqwest;

fn fix_gallery(body: &mut serde_json::Value) -> Result<(), serde_json::Error> {
    if body["id"].is_string() {
        body["id"] = serde_json::json!(
            body["id"].as_str().unwrap().parse::<usize>().unwrap()
        );
    }
    for title in ["english", "japanese", "pretty"].iter() {
        if body["title"][title].is_null() {
            body["title"][title] = serde_json::json!("")
        }
    }
    Ok(())
}

pub async fn get_sauce_info(client: reqwest::Client, sauce: usize) -> Result<structs::GalleryInfo, reqwest::Error> {
    let mut uri = String::from("https://nhentai.net/api/gallery/");
    uri.push_str(&sauce.to_string());
    let resp = client.get(&uri)
        .send()
        .await?;
    assert_eq!(resp.status().is_success(), true);
    let body = resp.text().await?;
    let mut body: serde_json::Value = serde_json::from_str(&body).unwrap();
    fix_gallery(&mut body).unwrap();
    Ok(serde_json::from_str(&serde_json::to_string(&body).unwrap()).unwrap())
}

pub async fn get_search_info(client: reqwest::Client, search_query: &str) -> Result<structs::SearchInfo, reqwest::Error> {
    let uri = "https://nhentai.net/api/galleries/search";
    let resp = client.get(uri)
        .query(&[("query", search_query)])
        .send()
        .await?;
    assert_eq!(resp.status().is_success(), true);
    let body = resp.text().await?;
    let mut body: serde_json::Value = serde_json::from_str(&body).unwrap();
    for i in 0..body["result"].as_array().unwrap().len() {
        fix_gallery(&mut body["result"][i]).unwrap();
    }
    Ok(serde_json::from_str(&serde_json::to_string(&body).unwrap()).unwrap())
}

pub async fn download_file(client: reqwest::Client, url: &str, file_name: &str) -> Result<(), reqwest::Error> {
    let resp = client.get(url)
        .send()
        .await?;
    let mut file = File::create(&file_name).unwrap();
    let mut stream = resp.bytes_stream();
    while let Some(item) = stream.next().await {
        file.write(&item?).unwrap();
    }
    Ok(())
}

pub fn get_arg_sauces(args: env::Args) -> Result<Vec<usize>, String> {
    let mut sauces: Vec<usize> = Vec::new();
    for sauce in args {
        let sauce: usize = match sauce.parse() {
                Ok(sauce) => sauce,
                Err(_) => {
                    return Err(format!("{} is not a number/sauce", sauce));
                }
        };
        if !sauces.contains(&sauce) {
            sauces.push(sauce);
        }
    }
    Ok(sauces)
}