use std::time::{Duration, SystemTime};
use chrono::{DateTime, Utc};
use reqwest::{IntoUrl, Method, RequestBuilder};
use serde::{Deserialize, Serialize};
use uuid::Uuid;
use super::{AuthError, MinecraftPlayerInfo, PlayerProfile};
use super::types::Token;

const MINECRAFT_LOGIN: &str = "https://api.minecraftservices.com/authentication/login_with_xbox";
const MINECRAFT_ENTITLEMENTS: &str = "https://api.minecraftservices.com/entitlements";
const MINECRAFT_PROFILE: &str = "https://api.minecraftservices.com/minecraft/profile";

const MINECRAFT_SESSION_PROFILE: &str = "https://sessionserver.mojang.com/session/minecraft/profile/";

fn build_authenticated(client: &reqwest::Client, url: impl IntoUrl, method: Method, mc_token: &str) -> RequestBuilder {
    super::build_json_request(client, url, method)
        .bearer_auth(mc_token)
}

#[derive(Serialize, Debug)]
#[serde(rename_all = "camelCase")]
struct MinecraftXboxLoginRequest<'a> {
    identity_token: &'a str,
    ensure_legacy_enabled: bool
}

#[derive(Deserialize, Debug)]
struct MinecraftXboxLoginResponse {
    access_token: String,
    expires_in: u64
}

pub async fn login_with_xbox(client: &reqwest::Client, xsts_token: &str, user_hash: &str) -> Result<Token, AuthError> {
    let tok = format!("XBL3.0 x={user_hash};{xsts_token}");
    let req = MinecraftXboxLoginRequest {
        identity_token: tok.as_str(),
        ensure_legacy_enabled: true
    };

    let res: MinecraftXboxLoginResponse = super::build_json_request(client, MINECRAFT_LOGIN, Method::POST)
        .json(&req).send().await
        .and_then(|r| r.error_for_status())
        .map_err(|e| AuthError::Request { what: "minecraft xbox login", error: e })?
        .json().await
        .map_err(|e| AuthError::Request { what: "minecraft xbox login (decode)", error: e })?;

    let now: DateTime<Utc> = SystemTime::now().into();

    Ok(Token {
        value: res.access_token,
        expire: Some(now + Duration::from_secs(res.expires_in))
    })
}

#[derive(Deserialize, Debug)]
struct EntitlementItem {
    name: String
    // we don't care about the signature
}

#[derive(Deserialize, Debug)]
struct EntitlementResponse {
    #[serde(default)]
    items: Vec<EntitlementItem>
}

pub async fn owns_the_game(client: &reqwest::Client, token: &str) -> Result<bool, AuthError> {
    let res: EntitlementResponse = build_authenticated(client, MINECRAFT_ENTITLEMENTS, Method::GET, token)
        .send().await
        .and_then(|r| r.error_for_status())
        .map_err(|e| AuthError::Request { what: "entitlements", error: e })?
        .json().await
        .map_err(|e| AuthError::Request { what: "entitlements (receive)", error: e})?;

    Ok(res.items.iter().filter(|i| i.name == "game_minecraft" || i.name == "product_minecraft").next().is_some())
}

pub async fn get_player_info(client: &reqwest::Client, token: &str) -> Result<MinecraftPlayerInfo, AuthError> {
    build_authenticated(client, MINECRAFT_PROFILE, Method::GET, token)
        .send().await
        .and_then(|r| r.error_for_status())
        .map_err(|e| AuthError::Request { what: "player info", error: e })?
        .json().await
        .map_err(|e| AuthError::Request { what: "player info (receive)", error: e })
}

pub async fn get_player_profile(client: &reqwest::Client, uuid: Uuid) -> Result<PlayerProfile, reqwest::Error> {
    super::build_json_request(client, format!("{}{}?unsigned=false", MINECRAFT_SESSION_PROFILE, uuid.as_simple()), Method::GET)
        .send().await
        .and_then(|r| r.error_for_status())?
        .json().await
}