use chrono::Utc;
use serde_json::Value;
use tokio_postgres::GenericClient;

use crate::activitypub::{
    activity::{Activity, Object},
    actors::{
        helpers::update_remote_profile,
        types::Actor,
    },
    handlers::create::get_note_content,
    vocabulary::{NOTE, PERSON},
};
use crate::config::Config;
use crate::database::DatabaseError;
use crate::errors::ValidationError;
use crate::models::{
    posts::queries::{
        get_post_by_remote_object_id,
        update_post,
    },
    posts::types::PostUpdateData,
    profiles::queries::get_profile_by_remote_actor_id,
};
use super::HandlerResult;

async fn handle_update_note(
    db_client: &mut impl GenericClient,
    object: Object,
) -> HandlerResult {
    let post_id = match get_post_by_remote_object_id(
        db_client,
        &object.id,
    ).await {
        Ok(post) => post.id,
        // Ignore Update if post is not found locally
        Err(DatabaseError::NotFound(_)) => return Ok(None),
        Err(other_error) => return Err(other_error.into()),
    };
    let content = get_note_content(&object)?;
    let updated_at = object.updated.unwrap_or(Utc::now());
    let post_data = PostUpdateData { content, updated_at };
    update_post(db_client, &post_id, post_data).await?;
    Ok(Some(NOTE))
}

async fn handle_update_person(
    config: &Config,
    db_client: &impl GenericClient,
    activity: Activity,
) -> HandlerResult {
    let actor: Actor = serde_json::from_value(activity.object)
        .map_err(|_| ValidationError("invalid actor data"))?;
    if actor.id != activity.actor {
        return Err(ValidationError("actor ID mismatch").into());
    };
    let profile = get_profile_by_remote_actor_id(
        db_client,
        &actor.id,
    ).await?;
    update_remote_profile(
        db_client,
        &config.instance(),
        &config.media_dir(),
        profile,
        actor,
    ).await?;
    Ok(Some(PERSON))
}

pub async fn handle_update(
    config: &Config,
    db_client: &mut impl GenericClient,
    activity: Value,
) -> HandlerResult {
    let activity: Activity = serde_json::from_value(activity)
        .map_err(|_| ValidationError("unexpected activity structure"))?;
    let object_type = activity.object["type"].as_str()
        .ok_or(ValidationError("unknown object type"))?;
    match object_type {
        NOTE => {
            let object: Object = serde_json::from_value(activity.object)
                .map_err(|_| ValidationError("invalid object"))?;
            handle_update_note(db_client, object).await
        },
        PERSON => {
            handle_update_person(config, db_client, activity).await
        },
        _ => {
            log::warn!("unexpected object type {}", object_type);
            Ok(None)
        },
    }
}