use crate::structs;

use std::env;
use std::fs::File;
use std::io::Write;
use tokio::stream::StreamExt;
use std::collections::BTreeMap;
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()
        );
    }
    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?;
    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!(resp.status().is_success());
    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)
}

pub fn human_sauce_info(sauce_info: &structs::GalleryInfoSuccess) -> String {
    let mut text = format!("Sauce: {}\nTitle: ", sauce_info.id);
    let japanese_title = sauce_info.title.japanese.as_ref();
    let english_title = sauce_info.title.english.as_ref();
    if english_title.is_some() {
        text.push_str(english_title.unwrap());
        if japanese_title.is_some() {
            text.push_str(&format!("\nJapanese Title: {}", japanese_title.unwrap()));
        }
    } else {
        text.push_str(japanese_title.unwrap());
    }
    let mut tag_hashmap = BTreeMap::new();
    for tag_info in &sauce_info.tags {
        let tag_key = tag_info.r#type.as_str();
        let tag_value = tag_info.name.as_str();
        let tag_vec = tag_hashmap.entry(tag_key).or_insert(Vec::new());
        tag_vec.push(tag_value);
    }
    for (tag_key, tag_value) in tag_hashmap {
        let tag_key = match tag_key {
            "tag" => "Tags",
            "artist" => "Artists",
            "parody" => "Parodies",
            "character" => "Characters",
            "group" => "Groups",
            "language" => "Languages",
            "category" => "Categories",
            _ => tag_key
        };
        text.push_str(&format!("\n{}: {}", tag_key, tag_value.join(", ")));
    }
    text.push_str(&format!("\nPages: {}\nFavorites: {}", sauce_info.num_pages, sauce_info.num_favorites));
    text
}