'use strict';

const fs = require('fs');

const knex = require('../knex');
const args = require('../argv');

async function getActorId(alert) {
	if (alert.actorSlug) {
		const actor = await knex('actors')
			.select('actors.id')
			.leftJoin('entities', 'entities.id', 'actors.entity_id')
			.where('actors.slug', alert.actorSlug)
			.where((builder) => {
				if (alert.actorEntitySlug) {
					builder
						.where('entities.slug', alert.actorEntitySlug)
						.where('entities.type', alert.actorEntityType);
				}
			})
			.first();

		if (actor) {
			return actor.id;
		}

		throw new Error(`No actor ${alert.actorSlug} for ${alert.username}`);
	}

	return null;
}

async function getEntityId(alert) {
	if (alert.entitySlug) {
		const entity = await knex('entities')
			.select('entities.id')
			.where({
				slug: alert.entitySlug,
				type: alert.entityType,
			})
			.first();

		if (entity) {
			return entity.id;
		}

		throw new Error(`No entity ${alert.entitySlug} for ${alert.username}`);
	}

	return null;
}

async function getTagId(alert) {
	if (alert.tagSlug) {
		const tag = await knex('tags')
			.select('tags.id')
			.where('slug', alert.tagSlug)
			.first();

		if (tag) {
			return tag.id;
		}

		throw new Error(`No tag ${alert.stashSlug} for ${alert.username}`);
	}

	return null;
}

async function getStashId(alert, userId) {
	if (alert.stashSlug) {
		const stash = await knex('stashes')
			.select('stashes.id')
			.where('stashes.slug', alert.stashSlug)
			.where('stashes.user_id', userId)
			.first();

		if (stash) {
			return stash.id;
		}

		throw new Error(`No stash ${alert.stashSlug} for ${alert.username}`);
	}

	return null;
}

async function createAlert(alert, { userId, actorId, entityId, tagId, stashId }) {
	const [alertId] = await knex('alerts')
		.insert({
			user_id: userId,
			notify: alert.notify,
			email: alert.email,
			created_at: alert.createdAt,
		})
		.returning('id');

	if (actorId) {
		await knex('alerts_actors').insert({
			alert_id: alertId,
			actor_id: actorId,
		});
	}

	if (entityId) {
		await knex('alerts_entities').insert({
			alert_id: alertId,
			entity_id: entityId,
		});
	}

	if (tagId) {
		await knex('alerts_tags').insert({
			alert_id: alertId,
			tag_id: tagId,
		});
	}

	if (stashId) {
		await knex('alerts_stashes').insert({
			alert_id: alertId,
			stash_id: stashId,
		});
	}
}

async function load() {
	const filename = process.argv[2];
	const file = await fs.promises.readFile(filename, 'utf8');

	const alerts = file.split('\n')
		.filter(Boolean)
		.map((data) => JSON.parse(data))
		.filter((alert) => !args.username || alert.username === args.username);

	await alerts.reduce(async (chain, alert, index) => {
		await chain;

		const user = await knex('users')
			.select('id')
			.where('username', alert.username)
			.first();

		if (!user) {
			throw new Error(`No user ${alert.username}`);
		}

		const actorId = await getActorId(alert);
		const entityId = await getEntityId(alert);
		const tagId = await getTagId(alert);
		const stashId = await getStashId(alert, user.id);

		await createAlert(alert, {
			userId: user.id,
			actorId,
			entityId,
			stashId,
			tagId,
		});

		console.log(`Loaded alert ${index + 1}/${alerts.length} from ${alert.username}`);
	}, Promise.resolve());

	process.exit();
}

load();