use crate::config::MastodonConfig;

use egg_mode::{
    entities::{MentionEntity, UrlEntity},
    user::UserEntityDetail,
};
use megalodon::{
    generator,
    mastodon::Mastodon,
    megalodon::{AppInputOptions, CredentialsFieldAttribute},
};
use regex::Regex;
use std::{collections::HashMap, io::stdin};

/// Decodes the Twitter mention to something that will make sense once Twitter has joined the
/// Fediverse. Users in the global user list of Scootaloo are rewritten, as they are Mastodon users
/// as well
pub fn twitter_mentions(
    toot: &mut String,
    ums: &[MentionEntity],
    masto: &HashMap<String, MastodonConfig>,
) {
    let tm: HashMap<String, String> = ums
        .iter()
        .map(|s| {
            (
                format!("@{}", s.screen_name),
                format!("@{}@twitter.com", s.screen_name),
            )
        })
        .chain(
            masto
                .values()
                .filter(|s| s.mastodon_screen_name.is_some())
                .map(|s| {
                    (
                        format!("@{}", s.twitter_screen_name),
                        format!(
                            "@{}@{}",
                            s.mastodon_screen_name.as_ref().unwrap(),
                            s.base.split('/').last().unwrap()
                        ),
                    )
                })
                .collect::<HashMap<String, String>>(),
        )
        .collect();

    for (k, v) in tm {
        *toot = toot.replace(&k, &v);
    }
}

/// Decodes urls in toot
pub fn decode_urls(toot: &mut String, urls: &HashMap<String, String>) {
    for (k, v) in urls {
        *toot = toot.replace(k, v);
    }
}

/// Reassociates source url with destination url for rewritting
/// this takes a Teet UrlEntity and an optional Regex
pub fn associate_urls(urls: &[UrlEntity], re: &Option<Regex>) -> HashMap<String, String> {
    urls.iter()
        .filter(|s| s.expanded_url.is_some())
        .map(|s| {
            (s.url.to_owned(), {
                let mut def = s.expanded_url.as_deref().unwrap().to_owned();

                if let Some(r) = re {
                    if r.is_match(s.expanded_url.as_deref().unwrap()) {
                        def = s.display_url.to_owned();
                    }
                }

                def
            })
        })
        .collect::<HashMap<String, String>>()
}

/// Replaces the commonly used services by mirrors, if asked to
pub fn replace_alt_services(urls: &mut HashMap<String, String>, alts: &HashMap<String, String>) {
    for val in urls.values_mut() {
        for (k, v) in alts {
            *val = val.replace(&format!("/{k}/"), &format!("/{v}/"));
        }
    }
}

/// Finds a Mastodon screen_name/base_url from a MastodonConfig
pub fn find_mastodon_screen_name_by_twitter_screen_name(
    twitter_screen_name: &str,
    masto: &HashMap<String, MastodonConfig>,
) -> Option<(String, String)> {
    masto.iter().find_map(|(_, v)| {
        if twitter_screen_name == v.twitter_screen_name && v.mastodon_screen_name.is_some() {
            Some((
                v.mastodon_screen_name.as_ref().unwrap().to_owned(),
                v.base.to_owned(),
            ))
        } else {
            None
        }
    })
}

/// Replaces the original quoted tweet by the corresponding toot
pub fn replace_tweet_by_toot(
    urls: &mut HashMap<String, String>,
    twitter_screen_name: &str,
    tweet_id: u64,
    mastodon_screen_name: &str,
    base_url: &str,
    toot_id: &str,
) {
    for val in urls.values_mut() {
        if val.to_lowercase().starts_with(&format!(
            "https://twitter.com/{}/status/{}",
            twitter_screen_name.to_lowercase(),
            tweet_id
        )) {
            *val = format!("{base_url}/@{mastodon_screen_name}/{toot_id}");
        }
    }
}

/// Gets Mastodon Data
pub fn get_mastodon_token(masto: &MastodonConfig) -> Mastodon {
    Mastodon::new(masto.base.to_string(), Some(masto.token.to_string()), None)
}

/// Gets note from twitter_user description
pub fn get_note_from_description(t: &Option<String>, urls: &[UrlEntity]) -> Option<String> {
    t.as_ref().map(|d| {
        let mut n = d.to_owned();
        let a_urls = associate_urls(urls, &None);
        decode_urls(&mut n, &a_urls);
        n
    })
}

/// Gets fields_attribute from UserEntityDetail
pub fn get_attribute_from_url(
    user_entity_detail: &Option<UserEntityDetail>,
) -> Option<Vec<CredentialsFieldAttribute>> {
    user_entity_detail.as_ref().and_then(|u| {
        u.urls.first().and_then(|v| {
            v.expanded_url.as_ref().map(|e| {
                vec![CredentialsFieldAttribute {
                    name: v.display_url.to_string(),
                    value: e.to_string(),
                }]
            })
        })
    })
}

/// Generic register function
/// As this function is supposed to be run only once, it will panic for every error it encounters
/// Most of this function is a direct copy/paste of the official `elefren` crate
#[tokio::main]
pub async fn register(host: &str, screen_name: &str) {
    let mastodon = generator(megalodon::SNS::Mastodon, host.to_string(), None, None);

    let options = AppInputOptions {
        redirect_uris: None,
        scopes: Some(
            [
                "read:accounts".to_string(),
                "write:accounts".to_string(),
                "write:media".to_string(),
                "write:statuses".to_string(),
            ]
            .to_vec(),
        ),
        website: Some("https://framagit.org/veretcle/scootaloo".to_string()),
    };

    let app_data = mastodon
        .register_app(env!("CARGO_PKG_NAME").to_string(), &options)
        .await
        .expect("Cannot build registration object!");

    let url = app_data.url.expect("Cannot generate registration URI!");

    println!("Click this link to authorize on Mastodon: {url}");
    println!("Paste the returned authorization code: ");

    let mut input = String::new();
    stdin()
        .read_line(&mut input)
        .expect("Unable to read back registration code!");

    let token_data = mastodon
        .fetch_access_token(
            app_data.client_id.to_owned(),
            app_data.client_secret.to_owned(),
            input.trim().to_string(),
            megalodon::default::NO_REDIRECT.to_string(),
        )
        .await
        .expect("Unable to create access token!");

    let mastodon = generator(
        megalodon::SNS::Mastodon,
        host.to_string(),
        Some(token_data.access_token.to_owned()),
        None,
    );

    let current_account = mastodon
        .verify_account_credentials()
        .await
        .expect("Unable to access account information!")
        .json();

    println!(
        r#"Please insert the following block at the end of your configuration file:
[mastodon.{}]
twitter_screen_name = "{}"
mastodon_screen_name = "{}"
base = "{}"
client_id = "{}"
client_secret = "{}"
redirect = "{}"
token = "{}""#,
        screen_name.to_lowercase(),
        screen_name,
        current_account.username,
        host,
        app_data.client_id,
        app_data.client_secret,
        app_data.redirect_uri,
        token_data.access_token,
    );
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_get_attribute_from_url() {
        let expected_credentials_field_attribute = CredentialsFieldAttribute {
            name: "Nintendojo.fr".to_string(),
            value: "https://www.nintendojo.fr".to_string(),
        };

        let true_urls = vec![UrlEntity {
            display_url: "Nintendojo.fr".to_string(),
            expanded_url: Some("https://www.nintendojo.fr".to_string()),
            range: (1, 3),
            url: "https://t.me/balek".to_string(),
        }];

        let false_urls = vec![UrlEntity {
            display_url: "Nintendojo.fr".to_string(),
            expanded_url: None,
            range: (1, 3),
            url: "https://t.me/balek".to_string(),
        }];

        assert!(get_attribute_from_url(&None).is_none());
        assert!(get_attribute_from_url(&Some(UserEntityDetail { urls: false_urls })).is_none());

        let binding = get_attribute_from_url(&Some(UserEntityDetail { urls: true_urls })).unwrap();
        let result_credentials_field_attribute = binding.first().unwrap();

        assert_eq!(
            result_credentials_field_attribute.name,
            expected_credentials_field_attribute.name
        );
        assert_eq!(
            result_credentials_field_attribute.value,
            expected_credentials_field_attribute.value
        );
    }

    #[test]
    fn test_get_note_from_description() {
        let urls = vec![UrlEntity {
            display_url: "tamerelol".to_string(),
            expanded_url: Some("https://www.nintendojo.fr/dojobar".to_string()),
            range: (1, 3),
            url: "https://t.me/tamerelol".to_string(),
        }];

        let some_description = Some("Youpi | https://t.me/tamerelol".to_string());
        let none_description = None;

        assert_eq!(
            get_note_from_description(&some_description, &urls),
            Some("Youpi | https://www.nintendojo.fr/dojobar".to_string())
        );

        assert_eq!(get_note_from_description(&none_description, &urls), None);
    }

    #[test]
    fn test_replace_tweet_by_toot() {
        let mut associated_urls = HashMap::from([
            (
                "https://t.co/perdudeouf".to_string(),
                "https://www.perdu.com".to_string(),
            ),
            (
                "https://t.co/realquoteshere".to_string(),
                "https://twitter.com/nintendojofr/status/1590047921633755136".to_string(),
            ),
            (
                "https://t.co/almostthere".to_string(),
                "https://twitter.com/NintendojoFR/status/nope".to_string(),
            ),
            (
                "http://t.co/yetanotherone".to_string(),
                "https://twitter.com/NINTENDOJOFR/status/1590047921633755136".to_string(),
            ),
        ]);

        let expected_urls = HashMap::from([
            (
                "https://t.co/perdudeouf".to_string(),
                "https://www.perdu.com".to_string(),
            ),
            (
                "https://t.co/realquoteshere".to_string(),
                "https://m.nintendojo.fr/@nintendojofr/109309605486908797".to_string(),
            ),
            (
                "https://t.co/almostthere".to_string(),
                "https://twitter.com/NintendojoFR/status/nope".to_string(),
            ),
            (
                "http://t.co/yetanotherone".to_string(),
                "https://m.nintendojo.fr/@nintendojofr/109309605486908797".to_string(),
            ),
        ]);

        replace_tweet_by_toot(
            &mut associated_urls,
            "NintendojoFR",
            1590047921633755136,
            "nintendojofr",
            "https://m.nintendojo.fr",
            "109309605486908797",
        );

        assert_eq!(associated_urls, expected_urls);
    }

    #[test]
    fn test_find_mastodon_screen_name_by_twitter_screen_name() {
        let masto_config = HashMap::from([
            (
                "test".to_string(),
                MastodonConfig {
                    twitter_screen_name: "tonpere".to_string(),
                    mastodon_screen_name: Some("lalali".to_string()),
                    twitter_page_size: None,
                    base: "https://mstdn.net".to_string(),
                    client_id: "".to_string(),
                    client_secret: "".to_string(),
                    redirect: "".to_string(),
                    token: "".to_string(),
                },
            ),
            (
                "test2".to_string(),
                MastodonConfig {
                    twitter_screen_name: "tamerelol".to_string(),
                    mastodon_screen_name: None,
                    twitter_page_size: None,
                    base: "https://mastoot.fr".to_string(),
                    client_id: "".to_string(),
                    client_secret: "".to_string(),
                    redirect: "".to_string(),
                    token: "".to_string(),
                },
            ),
            (
                "test3".to_string(),
                MastodonConfig {
                    twitter_screen_name: "NintendojoFR".to_string(),
                    mastodon_screen_name: Some("nintendojofr".to_string()),
                    twitter_page_size: None,
                    base: "https://m.nintendojo.fr".to_string(),
                    client_id: "".to_string(),
                    client_secret: "".to_string(),
                    redirect: "".to_string(),
                    token: "".to_string(),
                },
            ),
        ]);

        // case sensitiveness, to avoid any mistake
        assert_eq!(
            None,
            find_mastodon_screen_name_by_twitter_screen_name("nintendojofr", &masto_config)
        );
        assert_eq!(
            Some((
                "nintendojofr".to_string(),
                "https://m.nintendojo.fr".to_string()
            )),
            find_mastodon_screen_name_by_twitter_screen_name("NintendojoFR", &masto_config)
        );
        // should return None if twitter_screen_name is undefined
        assert_eq!(
            None,
            find_mastodon_screen_name_by_twitter_screen_name("tamerelol", &masto_config)
        );
        assert_eq!(
            Some(("lalali".to_string(), "https://mstdn.net".to_string())),
            find_mastodon_screen_name_by_twitter_screen_name("tonpere", &masto_config)
        );
    }

    #[test]
    fn test_twitter_mentions() {
        let mention_entities = vec![
            MentionEntity {
                id: 12345,
                range: (1, 3),
                name: "Ta Mere l0l".to_string(),
                screen_name: "tamerelol".to_string(),
            },
            MentionEntity {
                id: 6789,
                range: (1, 3),
                name: "TONPERE".to_string(),
                screen_name: "tonpere".to_string(),
            },
        ];

        let mut toot = ":kikoo: @tamerelol @tonpere !".to_string();

        let masto_config = HashMap::from([(
            "test".to_string(),
            (MastodonConfig {
                twitter_screen_name: "tonpere".to_string(),
                mastodon_screen_name: Some("lalali".to_string()),
                twitter_page_size: None,
                base: "https://mstdn.net".to_string(),
                client_id: "".to_string(),
                client_secret: "".to_string(),
                redirect: "".to_string(),
                token: "".to_string(),
            }),
        )]);

        twitter_mentions(&mut toot, &mention_entities, &masto_config);

        assert_eq!(&toot, ":kikoo: @tamerelol@twitter.com @lalali@mstdn.net !");
    }

    #[test]
    fn test_decode_urls() {
        let urls = HashMap::from([
            (
                "https://t.co/thisisatest".to_string(),
                "https://www.nintendojo.fr/dojobar".to_string(),
            ),
            (
                "https://t.co/nopenotinclusive".to_string(),
                "invité.es".to_string(),
            ),
        ]);

        let mut toot =
            "Rendez-vous sur https://t.co/thisisatest avec nos https://t.co/nopenotinclusive !"
                .to_string();

        decode_urls(&mut toot, &urls);

        assert_eq!(
            &toot,
            "Rendez-vous sur https://www.nintendojo.fr/dojobar avec nos invité.es !"
        );
    }

    #[test]
    fn test_associate_urls() {
        let urls = vec![
            UrlEntity {
                display_url: "tamerelol".to_string(),
                expanded_url: Some("https://www.nintendojo.fr/dojobar".to_string()),
                range: (1, 3),
                url: "https://t.me/tamerelol".to_string(),
            },
            UrlEntity {
                display_url: "sadcat".to_string(),
                expanded_url: None,
                range: (1, 3),
                url: "https://t.me/sadcat".to_string(),
            },
            UrlEntity {
                display_url: "invité.es".to_string(),
                expanded_url: Some("http://xn--invit-fsa.es".to_string()),
                range: (85, 108),
                url: "https://t.co/WAUgnpHLmo".to_string(),
            },
        ];

        let expected_urls = HashMap::from([
            (
                "https://t.me/tamerelol".to_string(),
                "https://www.nintendojo.fr/dojobar".to_string(),
            ),
            (
                "https://t.co/WAUgnpHLmo".to_string(),
                "invité.es".to_string(),
            ),
        ]);

        let re = Regex::new("(.+)\\.es$").ok();

        let associated_urls = associate_urls(&urls, &re);

        assert_eq!(associated_urls, expected_urls);
    }

    #[test]
    fn test_replace_alt_services() {
        let mut associated_urls = HashMap::from([
            (
                "https://t.co/youplaboom".to_string(),
                "https://www.youtube.com/watch?v=dQw4w9WgXcQ".to_string(),
            ),
            (
                "https://t.co/thisisfine".to_string(),
                "https://twitter.com/Nintendo/status/1594590628771688448".to_string(),
            ),
            (
                "https://t.co/nopenope".to_string(),
                "https://www.nintendojo.fr/dojobar".to_string(),
            ),
            (
                "https://t.co/broken".to_string(),
                "http://youtu.be".to_string(),
            ),
            (
                "https://t.co/alsobroken".to_string(),
                "https://youtube.com".to_string(),
            ),
        ]);

        let alt_services = HashMap::from([
            ("twitter.com".to_string(), "nitter.net".to_string()),
            ("youtu.be".to_string(), "invidio.us".to_string()),
            ("www.youtube.com".to_string(), "invidio.us".to_string()),
            ("youtube.com".to_string(), "invidio.us".to_string()),
        ]);

        let expected_urls = HashMap::from([
            (
                "https://t.co/youplaboom".to_string(),
                "https://invidio.us/watch?v=dQw4w9WgXcQ".to_string(),
            ),
            (
                "https://t.co/thisisfine".to_string(),
                "https://nitter.net/Nintendo/status/1594590628771688448".to_string(),
            ),
            (
                "https://t.co/nopenope".to_string(),
                "https://www.nintendojo.fr/dojobar".to_string(),
            ),
            (
                "https://t.co/broken".to_string(),
                "http://youtu.be".to_string(),
            ),
            (
                "https://t.co/alsobroken".to_string(),
                "https://youtube.com".to_string(),
            ),
        ]);

        replace_alt_services(&mut associated_urls, &alt_services);

        assert_eq!(associated_urls, expected_urls);
    }
}