use std::fs;
use std::fs::create_dir;
use std::path::Path;
use std::collections::HashMap;

use reqwest::header::{USER_AGENT, AUTHORIZATION};

use serde::{Serialize, Deserialize};
use serde_json::Value;

use dirs;

const PK_URL: &str = "https://api.pluralkit.me/v2";
const SP_URL: &str = "https://api.apparyllis.com/v1";

#[derive(Debug, Serialize, Deserialize, Clone)]
struct System {
    pk_userid: String,
    sp_userid: String,
    members: Vec<Member>,
}

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
struct Member {
    pk_id: String,
    sp_id: String,
    name: String,
    alias: String
}

#[derive(Debug)]
struct Fronters {
  sp: Vec<Member>,
  pk: Vec<Member>,
}

impl Fronters {
  fn new(pk: Vec<Member>, sp: Vec<Member>) -> Self {
    Self {sp, pk}
  }
}

fn main() {
    let helpstring = r#"PluralSync
Made by Jvnko@lavenderfield

Usage:\npluralsync [COMMAND] [member1] [member2]...

Commands:
sync - Fetches the system member information from PluralKit and SimplyPlural
set - Sets one or more members to the front
get - Refreshes the current front information
add - Adds a member to the existing front
memberlist - Shows loaded member list"#;

    if std::env::args().len() > 1 {
        let augs: Vec<String> = std::env::args().collect();
        let command = &augs[1];
        let config_path: String;

        match dirs::config_dir() {
            Some(x) => {
                config_path = format!("{}/pluralsync", x.display());
                match command.as_str() {
                    "sync" => {
                        let _ = sync(config_path);
                    },
                    "set" => {
                        if std::env::args().len() > 2 {
                            let _ = set_member(config_path, &augs[2..]).map_err(|e| println!("{e}"));

                        } else {
                            //set_empty(config_path);
                        }
                    },
                    "add" => {
                        if std::env::args().len() > 2 {
                            let _ = add_member(config_path, &augs[2..]).map_err(|e| println!("{e}"));
                        } else {
                            //add_empty(config_path);
                        }

                    }
                    "get" => get(config_path),
                    "memberlist" => memberlist(config_path),
                    &_ => println!("{}", helpstring),
                }
            },
            None => println!("Something went wrong")
        }
    } else {
        println!("{}", helpstring);
    }
}

fn sync(config_path: String) -> Result<(), String>{
    // Get config
    let config = get_config(&config_path);
    if config == Value::Null {
        println!("Stopping.");
        return Ok(());
    }

    let pk_key = &config["pk_key"].as_str().unwrap();
    let sp_key = &config["sp_key"].as_str().unwrap();

    // Get Pluralkit system id
    let pk_sys = pk_get_system(pk_key);
    let pk_sysid = pk_sys["id"].as_str().unwrap();

    // Get Simplyplural user id
    let sp_user_id = sp_get_userid(sp_key);

    // Get Simplyplural member ids
    let sp_member_ids = sp_get_memberids(sp_key, &sp_user_id);

    // get members
    let pk_members = pk_get_members(pk_key, pk_sysid);
    let mut members: Vec<Member> = Vec::new();
    for member in pk_members {
        let mut m = Member {
            pk_id: member["id"].as_str().unwrap().to_string(),
            sp_id: String::new(),
            name: member["name"].as_str().unwrap().to_string(),
            alias: String::new()
        };

        if member["display_name"].as_str() != None {
            m.alias = member["display_name"].as_str().unwrap().to_string();
        } else {
            m.alias = String::from(&m.name);
        }

        m.sp_id = get_sp_id(&m, &sp_member_ids);

        members.push(m);
    }

    let sys = System {
        pk_userid: pk_sysid.to_string(),
        sp_userid: sp_user_id,
        members: members.clone(),
    };

    let json = serde_json::to_string(&sys);
    let _ = fs::write(format!("{}/system.json", config_path), &json.unwrap());

    Ok(())
}

/*
TODO fn set_empty(config_path: String) {
TODO     let config = load_json(format!("{}/config.json", config_path));
TODO     let system = get_system(&config_path);
TODO }
*/

fn set_member(config_path: String, tf_members: &[String]) -> Result<(), &'static str> {
    let config = get_config(&config_path);
    if config == Value::Null {
        return Err("Config not found. Stopping");
    }

    let system: System = get_system(&config_path);

    let mut to_front: Vec<Member> = Vec::new();
    for member in tf_members {
        for mem in &system.members {
            if mem.name.to_lowercase() == member.to_lowercase() || mem.alias.to_lowercase() == member.to_lowercase() {
                println!("Member {member} found");
                to_front.push(mem.clone());

                break;
            }
        }
    }
    if to_front.len() != 0 {
        let fronters = get_fronters(&config["pk_key"].as_str().unwrap(), &config["sp_key"].as_str().unwrap(), &system);

        pk_set_fronters(&config["pk_key"].as_str().unwrap(), &system, &to_front, &fronters);
        sp_set_fronters(&config["sp_key"].as_str().unwrap(), &to_front, &fronters);

        get(config_path);
    } else {
        println!("No members found. Known members:\n--------------------------");
        memberlist(config_path);
        println!("--------------------------\nIf a member is missing from the system try running \"pluralsync sync\" to refresh the local database");
    }
    Ok(())
}

fn add_member(config_path: String, tf_members: &[String]) -> Result<(), &'static str> {
    let config = get_config(&config_path);
    if config == Value::Null {
        return Err("Config not found. Stopping");
    }

    let system: System = get_system(&config_path);

    let mut to_front: Vec<Member> = Vec::new();
    for member in tf_members {
        for mem in &system.members {
            if mem.name.to_lowercase() == member.to_lowercase() || mem.alias.to_lowercase() == member.to_lowercase() {
                to_front.push(mem.clone());
                break;
            }
        }
    }
    if to_front.len() != 0 {
        let fronters = get_fronters(&config["pk_key"].as_str().unwrap(), &config["sp_key"].as_str().unwrap(), &system);

        let mut aux: Vec<Member> = Vec::new();
        aux.append(&mut fronters.pk.clone());
        aux.append(&mut to_front);
        to_front = aux;

        pk_set_fronters(&config["pk_key"].as_str().unwrap(), &system, &to_front, &fronters);
        sp_set_fronters(&config["sp_key"].as_str().unwrap(), &to_front, &fronters);

        get(config_path);
    } else {
        println!("No members found. Known members:\n--------------------------");
        memberlist(config_path);
        println!("--------------------------\nIf a member is missing from the system try running \"pluralsync sync\" to refresh the local database");
    }
    Ok(())
}

fn memberlist(config_path: String) {
    let sys = get_system(&config_path);

    for mem in sys.members {
        if mem.name != mem.alias {
            println!("{} / {}", mem.name, mem.alias);
        } else {
            println!("{}", mem.name);
        }
    }

}

fn get(config_path: String) {
    let config = get_config(&config_path);
    let sys = get_system(&config_path);

    let f = get_fronters(&config["pk_key"].as_str().unwrap(), &config["sp_key"].as_str().unwrap(), &sys);
    let mut names = Vec::new();
    for m in &f.pk {
        names.push(String::from(&m.name));
    }
    let fronters = names.join(" || ");
    println!("Currently fronting: {}", fronters);
    let _ = fs::write(format!("{}/.front", config_path), fronters);
}

fn pk_get_system(key: &str) -> Value {
    let url = format!("{}/systems/@me", PK_URL);

    let res = http_get_request(url,key);
    return serde_json::from_str(&res.unwrap()).unwrap();
}

fn pk_get_members(key: &str, sysid: &str) -> Vec<Value> {
    let url = format!("{}/systems/{}/members", PK_URL, sysid);

    let res = http_get_request(url,key);
    let datas: Vec<Value> = serde_json::from_str(&res.unwrap()).unwrap();

    return datas;
}

fn pk_get_fronters(key: &str, sys: &System) -> Vec<Member> {
    let url = format!("{}/systems/{}/fronters", PK_URL, sys.pk_userid);

    let res = http_get_request(url,key);
    let data: Value = serde_json::from_str(&res.unwrap()).unwrap();
    let memberdata = &data["members"].as_array();

    let mut members: Vec<Member> = Vec::new();
    for member in memberdata {
        for m in member.into_iter() {
            for dbmem in &sys.members {
                if m["name"].as_str().unwrap() == dbmem.name {
                    members.push(dbmem.clone());
                }
            }
        }
    }

    return members;
}

fn pk_set_fronters(key: &str, sys: &System, to_front: &Vec<Member>, fronters: &Fronters) {
    let url = format!("{}/systems/{}/switches", PK_URL, sys.pk_userid);

    if to_front != &fronters.pk {
        let mut frontcodes = Vec::new();
        for tf in to_front {
            frontcodes.push(String::from(&tf.pk_id));
        }
        let mut body: HashMap<&str, Vec<String>> = HashMap::new();
        body.insert("members", frontcodes);
        let _ = http_post_request(url, key, &body);
    } else {
        println!("Members already fonting");
    }

}

fn sp_get_userid(key: &str) -> String {
    let url = format!("{}/me", SP_URL);

    let res = http_get_request(url,key);
    let json_res : Value = serde_json::from_str(&res.unwrap()).unwrap();
    return json_res["id"].as_str().unwrap().to_string();
}

fn sp_get_memberids(key: &str, system_id: &str) -> HashMap<String, String> {
    let url = format!("{}/members/{}", SP_URL, system_id);

    let res = http_get_request(url,key);
    let datas: Vec<Value> = serde_json::from_str(&res.unwrap()).unwrap();

    let mut sp_memberdata: HashMap<String, String> = HashMap::new();
    for data in datas {
        sp_memberdata.insert(String::from(data["content"]["name"].as_str().unwrap()), String::from(data["id"].as_str().unwrap()));
    }

    return sp_memberdata;
}

fn get_sp_id(mem: &Member, ids: &HashMap<String, String>) -> String {

    let mut member_id = String::new();

    for (mn, mid) in ids {
        if &mem.name == mn || &mem.alias == mn {
            member_id = String::from(mid);
        }
    }

    return member_id;
}

fn sp_get_fronters(key: &str, sys: &System) -> Vec<Member> {
    let url = format!("{}/fronters", SP_URL);

    let res = http_get_request(url,key);
    let datas: Vec<Value> = serde_json::from_str(&res.unwrap()).unwrap();

    let mut members = Vec::new();
    for data in datas {
        let sp_id = &data["content"]["member"].as_str().unwrap();
        for member in &sys.members {
            if &member.sp_id == sp_id {
                members.push(member.clone());
            }
        }

    }
    return members;
}

fn sp_get_frontids(key: &str, to_id: &Member) -> String {
    let url = format!("{}/fronters", SP_URL);

    let res = http_get_request(url,key);
    let datas: Vec<Value> = serde_json::from_str(&res.unwrap()).unwrap();

    for data in datas {
        let sp_f_id = &data["id"].as_str().unwrap();
        let sp_id = &data["content"]["member"].as_str().unwrap();
        if sp_id.to_string() == to_id.sp_id {
            return sp_f_id.to_string();
        }
    }
    return String::new();
}

fn sp_set_fronters(key: &str, to_front: &Vec<Member>, fronters: &Fronters) {
    if to_front == &fronters.sp {
        println!("Members already fonting");
        return;
    }

    for fronting_member in &fronters.sp {
        if !to_front.contains(&fronting_member) {
            let f_id = sp_get_frontids(&key, &fronting_member);

            let url = format!("{}/frontHistory/{}", SP_URL, f_id);

            #[derive (Serialize)]
            #[allow (non_snake_case)]
            struct SpRem {
                live: bool,
                endTime: u64
            }

            let end_time = std::time::SystemTime::now().duration_since(std::time::SystemTime::UNIX_EPOCH).expect("wa").as_secs();
            let rem = SpRem {
                live: false,
                endTime: end_time * 1000
            };

            let body = serde_json::to_string(&rem).expect("Error");

            let _ = http_patch_request(url, key, body);
        }
    }

    for tf_member in to_front {
        if !fronters.sp.contains(&tf_member) {
            let url = format!("{}/frontHistory", SP_URL);

            #[derive (Serialize)]
            #[allow (non_snake_case)]
            struct SpAdd {
                member: String,
                custom: bool,
                live: bool,
                startTime: u64
            }

            let start_time = std::time::SystemTime::now().duration_since(std::time::SystemTime::UNIX_EPOCH).expect("wa").as_secs();
            let rem = SpAdd {
                member: String::from(&tf_member.sp_id),
                custom: false,
                live: true,
                startTime: start_time * 1000
            };

            let body = serde_json::to_string(&rem).expect("Error");

            let _ = http_post_request_st(url, key, body);
        }
    }
}

fn load_json(path: String) -> Value {
    if Path::new(&path).exists() {
        let config_data = fs::read_to_string(&path).expect("File not found");
        return serde_json::from_str(&config_data).unwrap();
    } else {
        println!("Config file in {path} not found");
        return Value::Null;
    }
}

fn get_config(config_path: &str) -> Value {
    let path = format!("{}/config.json", config_path);
    if Path::new(config_path).exists() {

        let result = load_json(String::from(&path));

        if result == Value::Null {
            println!("Config file missing, creating template in {path}");
            let _ = fs::write(path, r#"
{
    "pk_key": "// Pluralkit token",
    "sp_key": "// Simplplural token"
}
                                    "#);
            }

        return result;
    } else {
        println!("Directory {config_path} does not exist. Creating with template config");
        let _ = create_dir(config_path);
        let _ = fs::write(path, r#"
{
    "pk_key": "// Pluralkit token",
    "sp_key": "// Simplplural token"
}
                                "#);
        return Value::Null;
    }
}

fn get_system(config_path: &str) -> System {
    let path = format!("{}/system.json", config_path);

    let mut result = load_json(String::from(&path));

    if result == Value::Null {
        println!("Syncing system config");
        let _ = sync(String::from(config_path));
        result = load_json(String::from(&path));
    }

    let vec = serde_json::to_vec(&result).unwrap();
    let sys = serde_json::from_slice::<System>(&vec).unwrap();

    return sys;

}

fn get_fronters(pk_key: &str, sp_key: &str, sys: &System) -> Fronters {
    let fronters = Fronters::new(
        pk_get_fronters(pk_key, sys),
        sp_get_fronters(sp_key, sys)
    );

//     if fronters["pk"] != fronters["sp"] {
//         fronters.insert(String::from("pk"), fronters["sp"].clone());
//     }

    return fronters;
}

#[tokio::main]
async fn http_get_request(url: String, key: &str) -> Result<String, Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    let res = client
        .get(url)
        .header(USER_AGENT, "Pluralsync")
        .header(AUTHORIZATION, key)
        .send()
        .await?
        .text()
        .await?;
    Ok(res)
}

#[tokio::main]
async fn http_post_request(url: String, key: &str, body: &HashMap<&str, Vec<String>>) -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    let _= client
        .post(url)
        .json(body)
        .header(USER_AGENT, "Pluralsync")
        .header(AUTHORIZATION, key)
        .send()
        .await?;
    Ok(())
}

#[tokio::main]
async fn http_post_request_st(url: String, key: &str, body: String) -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    let c = client
        .post(url)
        .body(body)
        .header("content-type", "application/json; charset=utf-8")
        .header(USER_AGENT, "Pluralsync")
        .header(AUTHORIZATION, key);
    let _res = c.send()
        .await?;
    Ok(())
}

#[tokio::main]
async fn http_patch_request(url: String, key: &str, body: String ) -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    let c = client
        .patch(url)
        .body(body)
        .header("content-type", "application/json; charset=utf-8")
        .header(USER_AGENT, "Pluralsync")
        .header(AUTHORIZATION, key);
    let _res = c.send()
        .await?;
    Ok(())
}