use std::io::{Error, ErrorKind};
use chrono::{DateTime, FixedOffset};
use reqwest::Client;
use serde::Deserialize;

use crate::{Modloader, List};

#[derive(Debug, Deserialize, Clone)]
pub struct Project {
    pub slug: String,
    pub title: String,
    pub description: String,
    pub categories: Vec<String>,
    pub client_side: Side,
    pub server_side: Side,
    pub body: String,
    pub additional_categories: Option<Vec<String>>,
    pub project_type: Type,
    pub downloads: u32,
    pub icon_url: Option<String>,
    pub id: String,
    pub team: String,
    pub moderator_message: Option<ModeratorMessage>,
    pub published: String,
    pub updated: String,
    pub approved: Option<String>,
    pub followers: u32,
    pub status: Status,
    pub license: License,
    pub versions: Vec<String>,
}

#[derive(Debug, Deserialize, Clone)]
pub struct License {
    pub id: String,
    pub name: String,
    pub url: Option<String>,
}

#[derive(Debug, Deserialize, Clone)]
pub struct ModeratorMessage {
    pub message: String,
    pub body: Option<String>,
}

#[allow(non_camel_case_types)]
#[derive(Debug, Deserialize, Clone)]
pub enum Side {
    required,
    optional,
    unsupported
}

#[allow(non_camel_case_types)]
#[derive(Debug, Deserialize, Clone)]
pub enum Type {
    r#mod,
    modpack,
    recourcepack
}

#[allow(non_camel_case_types)]
#[derive(Debug, Deserialize, Clone)]
pub enum Status {
    approved,
    rejected,
    draft,
    unlisted,
    archived,
    processing,
    unknown
}

#[derive(Debug, Clone, Deserialize)]
pub struct Version {
    pub name: String,
    pub version_number: String,
    pub changelog: Option<String>,
    pub game_versions: Vec<String>,
    pub version_type: VersionType,
    pub loaders: Vec<String>,
    pub featured: bool,
    pub id: String,
    pub project_id: String,
    pub author_id: String,
    pub date_published: String,
    pub downloads: u32,
    pub files: Vec<VersionFile>,
}

#[allow(non_camel_case_types)]
#[derive(Debug, Clone, Deserialize)]
pub enum VersionType {
    release,
    beta,
    alpha
}

#[derive(Debug, Clone, Deserialize)]
pub struct VersionFile {
    pub hashes: Hash,
    pub url: String,
    pub filename: String,
    pub primary: bool,
    pub size: u32,
}

#[derive(Debug, Clone, Deserialize)]
pub struct Hash {
    pub sha512: String,
    pub sha1: String,
}

async fn get(api: String, path: String) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
    let url = format!(r#"{}{}"#, api, path);
    
    let client = Client::builder()
        .user_agent(format!("fxqnlr/modlistcli/{} (fxqnlr@gmail.com)", env!("CARGO_PKG_VERSION")))
        .build()?;
    let data = client.get(url)
        .send()
        .await?
        .bytes()
        .await?
        .to_vec();

    Ok(data)
}

pub async fn project(api: String, name: &str) -> Project {
    println!("!!!PROJECT");
    let url = format!("project/{}", name);
    let data = get(api, url);

    serde_json::from_slice(&data.await.unwrap()).unwrap()
}

pub async fn projects(api: String, ids: Vec<String>) -> Vec<Project> {
    //println!("!!!PROJECTS");
    println!("Getting versions for all mods from modrinth");
    let all = ids.join(r#"",""#);
    let url = format!(r#"projects?ids=["{}"]"#, all);
    //println!("{}", url);

    let data = get(api, url);
    
    serde_json::from_slice(&data.await.unwrap()).unwrap()
}

pub async fn versions(api: String, id: String, list: List) -> Vec<Version> {
    println!("!!!VERSIONS");
    let loaderstr = match list.modloader {
        Modloader::Forge => String::from("forge"),
        Modloader::Fabric => String::from("fabric"),
    };

    let url = format!(r#"project/{}/version?loaders=["{}"]&game_versions=["{}"]"#, id, loaderstr, list.mc_version);

    let data = get(api, url);

    serde_json::from_slice(&data.await.unwrap()).unwrap()
}

pub async fn get_raw_versions(api: String, versions: Vec<String>) -> Vec<Version> {
    println!("!!!RAWVERSIONS");
    println!("Getting versions {}", &versions.join(", "));

    let url = format!(r#"versions?ids=["{}"]"#, versions.join(r#"",""#));

    let data = get(api, url).await;

    serde_json::from_slice(&data.unwrap()).unwrap()
}

pub fn extract_current_version(versions: Vec<Version>) -> Result<String, Box<dyn std::error::Error>> {
    match versions.len() {
        0 => Err(Box::new(Error::new(ErrorKind::NotFound, "NO_VERSIONS_AVAILABLE"))),
        1.. => {
            let mut times: Vec<(String, DateTime<FixedOffset>)> = vec![];
            for ver in versions {
                let stamp = DateTime::parse_from_rfc3339(&ver.date_published)?;
                times.push((ver.id, stamp))
            }
            times.sort_by_key(|t| t.1);
            times.reverse();
            println!("Current Version: {}", times[0].0);
            Ok(times[0].0.to_string())
        },
        _ => panic!("available_versions should never be negative"),
    }
}