// auto-imports
use crate::ScootalooError;
use crate::config::TwitterConfig;
use crate::util::cache_media;

// std
use std::error::Error;

// egg-mode
use egg_mode::{
    Token,
    KeyPair,
    entities::{MediaEntity, MediaType},
    user::UserID,
    tweet::{
        Tweet,
        user_timeline,
    },
};

/// Gets Twitter oauth2 token
pub fn get_oauth2_token(config: &TwitterConfig) -> Token {
    let con_token = KeyPair::new(String::from(&config.consumer_key), String::from(&config.consumer_secret));
    let access_token = KeyPair::new(String::from(&config.access_key), String::from(&config.access_secret));

    Token::Access {
        consumer: con_token,
        access: access_token,
    }
}

/// Gets Twitter user timeline
pub async fn get_user_timeline(config: &TwitterConfig, token: Token, lid: Option<u64>) -> Result<Vec<Tweet>, Box<dyn Error>> {
    // fix the page size to 200 as it is the maximum Twitter authorizes
    let (_, feed) = user_timeline(UserID::from(String::from(&config.username)), true, false, &token)
                .with_page_size(200)
                .older(lid)
                .await?;

    Ok(feed.to_vec())
}

/// Retrieves a single media from a tweet and store it in a temporary file
pub async fn get_tweet_media(m: &MediaEntity, t: &str) -> Result<String, Box<dyn Error>> {
    match m.media_type {
        MediaType::Photo => {
            return cache_media(&m.media_url_https, t).await;
        },
        _ => {
            match &m.video_info {
                Some(v) => {
                    for variant in &v.variants {
                        if variant.content_type == "video/mp4" {
                            return cache_media(&variant.url, t).await;
                        }
                    }
                    return Err(ScootalooError::new(&format!("Media Type for {} is video but no mp4 file URL is available", &m.url)).into());
                },
                None => {
                    return Err(ScootalooError::new(&format!("Media Type for {} is video but does not contain any video_info", &m.url)).into());
                },
            }
        },
    };
}