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

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

        let submission_id = submission.id();

        let mut changes = submission.update();
        if self.published.is_some() {
            changes.publish(self.published);
        }
        if let Some(description) = &self.description {
            changes.description(description);
        }
        let submission = if changes.any_changes() {
            ctx.store.submissions.update(&changes)?
        } else {
            submission
        };

        let mut changes = submission.update_files();
        for file in &self.files {
            if let Ok(Some(file)) = ctx.store.files.by_id(*file) {
                changes.add_file(&file);
            }
        }
        let submission = if changes.any_changes() {
            ctx.store.submissions.update_files(&changes)?
        } else {
            submission
        };

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

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

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

        Ok(Some(Box::new(
            crate::apub::results::UnpublishedSubmissionCreated { submission_id },
        )))
    }
}

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

        let initial_published = submission.published().is_some();

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

        let mut changes = submission.update_files();
        if let Some(removed) = &self.removed_files {
            for file in removed {
                if let Ok(Some(file)) = ctx.store.files.by_id(*file) {
                    changes.delete_file(&file);
                    ctx.spawner.purge_file(file.id());
                }
            }
        }
        if let Some(new) = &self.new_files {
            for file in new {
                if let Ok(Some(file)) = ctx.store.files.by_id(*file) {
                    changes.add_file(&file);
                }
            }
        }
        ctx.store.submissions.update_files(&changes)?;

        let newly_published = !initial_published && submission.published().is_some();
        let profile_id = submission.profile_id();
        if ctx.is_local(profile_id)? {
            if newly_published {
                return Ok(Some(Box::new(crate::apub::results::SubmissionCreated {
                    submission_id,
                })));
            } else if submission.published().is_some() {
                return Ok(Some(Box::new(crate::apub::results::SubmissionUpdated {
                    submission_id,
                })));
            }
        }

        Ok(None)
    }
}

fn delete_comment(comment_id: uuid::Uuid, ctx: &Context) -> Result<(), Error> {
    Action::perform(
        &DeleteComment {
            delete_apub_id: None,
            comment_id,
        },
        ctx,
    )?;
    Ok(())
}

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

        if let Some(undo_submission) = opt {
            if undo_submission.0.published().is_some() {
                let note_apub_id = ctx
                    .apub
                    .apub_for_submission(submission_id)?
                    .req("apub for submission")?;
                ctx.apub.delete_object(&note_apub_id)?;
            }

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

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

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

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

        Ok(None)
    }
}