use crate::{
    apub::actions::{
        AnnounceSubmission, CreateSubmission, DeleteComment, DeleteSubmission, UpdateSubmission,
    },
    Action, Outbound, Context, Error, Required,
};
use std::collections::HashSet;

impl Action for CreateSubmission {
    fn perform(&self, context: &Context) -> Result<Option<Box<dyn Outbound>>, Error> {
        let submission =
            context
                .store
                .submissions
                .create(self.profile_id, &self.title, self.visibility)?;

        let submission_id = submission.id();

        let mut changes = submission.update();
        changes.publish(Some(self.published));
        if let Some(description) = &self.description {
            changes.description(description);
        }
        let submission = context.store.submissions.update(&changes)?;
        let mut changes = submission.update_files();
        for file in &self.files {
            if let Ok(Some(file)) = context.store.files.by_id(*file) {
                changes.add_file(&file);
            }
        }
        let submission = context.store.submissions.update_files(&changes)?;

        if let Some(apub_id) = &self.note_apub_id {
            context.apub.submission(apub_id, submission_id)?;
        }

        let profile_id = self.profile_id;
        let published = submission.published().req()?;
        let context_clone = context.clone();
        context.spawn_blocking(move || {
            for follower_id in context_clone.store.view.follows.forward_iter(profile_id) {
                if let Ok(Some(true)) = context_clone.store.profiles.is_local(follower_id) {
                    context_clone
                        .store
                        .view
                        .submissions
                        .new(follower_id, submission_id, published);
                }
            }
        });

        if context.is_local(submission.profile_id())? {
            return Ok(Some(Box::new(crate::apub::results::SubmissionCreated {
                submission_id,
            })));
        }

        Ok(None)
    }
}

impl Action for AnnounceSubmission {
    fn perform(&self, _: &Context) -> Result<Option<Box<dyn Outbound>>, Error> {
        Ok(None)
    }
}

impl Action for UpdateSubmission {
    fn perform(&self, context: &Context) -> Result<Option<Box<dyn Outbound>>, Error> {
        let submission_id = self.submission_id;
        let submission = context.store.submissions.by_id(submission_id)?.req()?;

        let mut changes = submission.update();
        if let Some(title) = &self.title {
            changes.title(title);
        }
        if let Some(description) = &self.description {
            changes.description(description);
        }
        let submission = context.store.submissions.update(&changes)?;

        let mut original_files = submission.files().iter().cloned().collect::<HashSet<_>>();
        let mut changes = submission.update_files();
        for file in &self.files {
            original_files.remove(file);
            if let Ok(Some(file)) = context.store.files.by_id(*file) {
                changes.add_file(&file);
            }
        }
        context.store.submissions.update_files(&changes)?;
        for file in original_files {
            context.spawner.purge_file(file);
        }

        let profile_id = submission.profile_id();
        if context.is_local(profile_id)? {
            return Ok(Some(Box::new(crate::apub::results::SubmissionUpdated {
                submission_id,
            })));
        }

        Ok(None)
    }
}

fn delete_comment(comment_id: uuid::Uuid, context: &Context) -> Result<(), Error> {
    let note_apub_id = context.apub.apub_for_comment(comment_id)?.req()?;
    Action::perform(
        &DeleteComment {
            note_apub_id,
            comment_id,
        },
        context,
    )?;
    Ok(())
}

impl Action for DeleteSubmission {
    fn perform(&self, context: &Context) -> Result<Option<Box<dyn Outbound>>, Error> {
        let submission_id = self.submission_id;
        let opt = context.store.submissions.delete(submission_id)?;

        if let Some(undo_submission) = opt {
            let note_apub_id = context.apub.apub_for_submission(submission_id)?.req()?;
            context.apub.delete_object(&note_apub_id)?;

            let context_clone = context.clone();
            context.spawn_blocking(move || {
                for comment_id in context_clone.store.comments.for_submission(submission_id) {
                    if let Err(e) = delete_comment(comment_id, &context_clone) {
                        log::error!("Failed to delete comment {}: {}", comment_id, e);
                    }
                }
            });

            for file_id in undo_submission.0.files() {
                context.spawner.purge_file(*file_id);
            }

            let context_clone = context.clone();
            context.spawn_blocking(move || {
                context_clone.store.view.submissions.remove(submission_id);
            });

            let profile_id = undo_submission.0.profile_id();
            if context.is_local(profile_id)? {
                return Ok(Some(Box::new(crate::apub::results::SubmissionDeleted {
                    profile_id,
                    submission_id,
                })));
            }
        }

        Ok(None)
    }
}