use log::debug;

mod error;
pub use error::OolatoocsError;

mod config;
pub use config::{parse_toml, Config};

mod state;
use state::{delete_state, read_all_state, read_state, write_state, TootRecord};
pub use state::{init_db, migrate_db};

mod mastodon;
pub use mastodon::register;
use mastodon::{get_mastodon_instance, get_mastodon_timeline_since, get_status_edited_at};

mod utils;
use utils::{generate_multi_tweets, strip_everything};

mod bsky;
use bsky::{
    build_post_record, generate_media_records, generate_quote_records, generate_webcard_records,
    get_session, BskyReply,
};

use rusqlite::Connection;

#[tokio::main]
pub async fn run(config: &Config) {
    let conn = Connection::open(&config.oolatoocs.db_path)
        .unwrap_or_else(|e| panic!("Cannot open DB: {}", e));

    let mastodon = get_mastodon_instance(&config.mastodon)
        .unwrap_or_else(|e| panic!("Cannot instantiate Mastodon: {}", e));

    let bluesky = get_session(&config.bluesky)
        .await
        .unwrap_or_else(|e| panic!("Cannot get Bsky session: {}", e));

    let last_entry =
        read_state(&conn, None).unwrap_or_else(|e| panic!("Cannot get last toot id: {}", e));

    let last_toot_id: Option<u64> = match last_entry {
        None => None, // Does not exist, this is the same as previously
        Some(t) => {
            match get_status_edited_at(&mastodon, t.toot_id).await {
                None => Some(t.toot_id),
                Some(d) => {
                    // a date has been found
                    if d > t.datetime.unwrap() {
                        debug!("Last toot date is posterior to the previously written tweet, deleting…");
                        let local_record_uris =
                            read_all_state(&conn, t.toot_id).unwrap_or_else(|e| {
                                panic!(
                                    "Cannot fetch all records associated with Toot ID {}: {}",
                                    t.toot_id, e
                                )
                            });
                        for local_record_uri in local_record_uris.into_iter() {
                            bluesky
                                .delete_record(&local_record_uri)
                                .await
                                .unwrap_or_else(|e| {
                                    panic!("Cannot delete record ID ({}): {}", &t.record_uri, e)
                                });
                        }
                        delete_state(&conn, t.toot_id).unwrap_or_else(|e| {
                            panic!("Cannot delete Toot ID ({}): {}", t.toot_id, e)
                        });
                        read_state(&conn, None)
                            .unwrap_or_else(|e| panic!("Cannot get last toot id: {}", e))
                            .map(|a| a.toot_id)
                    } else {
                        Some(t.toot_id)
                    }
                }
            }
        }
    };

    let timeline = get_mastodon_timeline_since(&mastodon, last_toot_id)
        .await
        .unwrap_or_else(|e| panic!("Cannot get instance: {}", e));

    for toot in timeline {
        // detecting tag #NoTweet and skipping the toot
        if toot.tags.iter().any(|f| &f.name == "notweet") {
            continue;
        }

        // form tweet_content and strip everything useless in it
        let toot_tags: Vec<megalodon::entities::status::Tag> =
            match &config.oolatoocs.remove_hashtags {
                true => toot.tags.clone(),
                false => vec![],
            };
        let Ok(mut tweet_content) =
            strip_everything(&toot.content, &toot_tags, &config.mastodon.base)
        else {
            continue; // skip in case we can’t strip something
        };

        // threads if necessary
        let mut record_reply_to = toot.in_reply_to_id.and_then(|t| {
            read_state(&conn, Some(t.parse::<u64>().unwrap()))
                .ok()
                .flatten()
                .map(|s| BskyReply {
                    record_uri: s.record_uri.to_owned(),
                    root_record_uri: s.root_record_uri.to_owned(),
                })
        });

        // if the toot is too long, we cut it in half here
        if let Some((first_half, second_half)) = generate_multi_tweets(&tweet_content) {
            tweet_content = second_half;
            // post the first half
            let record = build_post_record(
                &config.bluesky,
                &first_half,
                &toot.language,
                None,
                &record_reply_to,
            )
            .await
            .unwrap_or_else(|e| panic!("Cannot create valid record for {}: {}", &toot.id, e));
            let record_reply_id = bluesky.create_record(record).await.unwrap_or_else(|e| {
                panic!(
                    "Cannot post the first half of {} for Bluesky: {}",
                    &toot.id, e
                )
            });
            // write it to db
            write_state(
                &conn,
                TootRecord {
                    toot_id: toot.id.parse::<u64>().unwrap(),
                    record_uri: record_reply_id.data.uri.to_owned(),
                    root_record_uri: record_reply_to
                        .as_ref()
                        .map_or(record_reply_id.data.uri.to_owned(), |v| {
                            v.root_record_uri.to_owned()
                        }),
                    datetime: None,
                },
            )
            .unwrap_or_else(|e| {
                panic!(
                    "Cannot store Toot/Tweet/Record ({}/{}): {}",
                    &toot.id, &record_reply_id.data.uri, e
                )
            });

            record_reply_to = Some(BskyReply {
                record_uri: record_reply_id.data.uri.to_owned(),
                root_record_uri: record_reply_to
                    .as_ref()
                    .map_or(record_reply_id.data.uri.clone(), |v| {
                        v.root_record_uri.clone()
                    }),
            });
        };

        // handle quote if any
        let quote_embed = match toot.reblog {
            Some(r) => {
                let quote_record = read_state(&conn, Some(r.id.parse::<u64>().unwrap()));
                match quote_record {
                    Ok(Some(q)) => generate_quote_records(&config.bluesky, &q.record_uri)
                        .await
                        .ok(),
                    _ => None,
                }
            }
            None => None,
        };

        // handle medias if any
        let media_embed = if toot.media_attachments.len() > usize::from(0u8) {
            generate_media_records(&bluesky, &toot.media_attachments)
                .await
                .ok()
        } else {
            None
        };

        // handle webcard if any
        let webcard_embed = match toot.card {
            Some(t) => generate_webcard_records(&bluesky, &t).await.ok(),
            None => None,
        };

        let record_embed = if quote_embed.is_some() {
            if media_embed.is_some() {
                let medias_mapped = match media_embed.unwrap() {
                    atrium_api::app::bsky::feed::post::RecordEmbedRefs::AppBskyEmbedImagesMain(a) => atrium_api::app::bsky::embed::record_with_media::MainMediaRefs::AppBskyEmbedImagesMain(a),
                    atrium_api::app::bsky::feed::post::RecordEmbedRefs::AppBskyEmbedVideoMain(a) => atrium_api::app::bsky::embed::record_with_media::MainMediaRefs::AppBskyEmbedVideoMain(a),
                    _ => continue, // this should NEVER happen as Media are either Video or
                                   // Images at this point
                };
                let quote_mapped = match quote_embed.unwrap() {
                    atrium_api::app::bsky::feed::post::RecordEmbedRefs::AppBskyEmbedRecordMain(
                        a,
                    ) => a,
                    _ => continue, // again, this should NEVER happen
                };
                Some(atrium_api::types::Union::Refs(
                        atrium_api::app::bsky::feed::post::RecordEmbedRefs::AppBskyEmbedRecordWithMediaMain(
                            Box::new(
                                atrium_api::app::bsky::embed::record_with_media::MainData {
                                    media: atrium_api::types::Union::Refs(medias_mapped),
                                    record: (*quote_mapped),
                                }.into()
                            )
                        )
                ))
            } else {
                quote_embed.map(atrium_api::types::Union::Refs)
            }
        } else if media_embed.is_some() {
            media_embed.map(atrium_api::types::Union::Refs)
        } else if webcard_embed.is_some() {
            webcard_embed.map(atrium_api::types::Union::Refs)
        } else {
            None
        };

        // posts corresponding tweet
        let record = build_post_record(
            &config.bluesky,
            &tweet_content,
            &toot.language,
            record_embed,
            &record_reply_to,
        )
        .await
        .unwrap_or_else(|e| panic!("Cannot build record for {}: {}", &toot.id, e));

        let created_record = bluesky
            .create_record(record)
            .await
            .unwrap_or_else(|e| panic!("Cannot put record {}: {}", &toot.id, e));

        // writes the current state of the tweet
        write_state(
            &conn,
            TootRecord {
                toot_id: toot.id.parse::<u64>().unwrap(),
                record_uri: created_record.data.uri.clone(),
                root_record_uri: record_reply_to
                    .as_ref()
                    .map_or(created_record.data.uri.clone(), |v| {
                        v.root_record_uri.clone()
                    }),
                datetime: None,
            },
        )
        .unwrap_or_else(|e| panic!("Cannot store Toot/Tweet ({}): {}", &toot.id, e));
    }
}