"use strict";
/* eslint-disable no-undef */

/*
SELECT
	reviews.movie_id,
	movie.title AS title,
	COUNT(reviews.*) AS positive_review_count
FROM reviews
JOIN
	movies AS movie ON reviews.movie_id = movie.id
WHERE
	reviews.rating > 3
	AND movie.title LIKE '%Movie%'
GROUP BY (reviews.movie_id, movie.id);
*/
query = select("reviews", [
	define({ movie: belongsTo("movie_id") }),
	where({
		rating: moreThan(3),
		movie: { title: includes("Movie") }
	}),
	collapseBy("movie_id", [
		compute({ positive_review_count: count() }),
		renameColumn("movie.title", "title")
	])
]);


/*
SELECT
	movies.*,
	COUNT(reviews_1.*) AS positive_review_count
FROM movies
LEFT JOIN
	reviews AS reviews_1 ON
		movies.id = reviews_1.movie_id
		AND reviews_1.rating > 3
GROUP BY movies.id;

NOTES:
- Must be a LEFT JOIN, to ensure that the rows from the parent table are always present
- Foreign predicates are in the ON, not the WHERE; that way they filter the foreign inputs, not the JOIN output?
MARKER: Continue fleshing out the mental model for all these different features, and how they translate to SQL. Also figure out where *non*-relation virtual tables fit into the picture, with aggregrates and such - especially whether they also require the primary-key GROUP BY.
*/
query = select("movies", [
	compute({ // better name for withDerived?
		positive_review_count: count(has("reviews.movie_id", [
			where({ rating: moreThan(3) })
		]))
	})
]);

query = select("movies", [
	define({ reviews_1: has("reviews.movie_id", [
		where({ rating: moreThan(3) })
	])}),
	compute({ // better name for withDerived?
		positive_review_count: count("reviews_1")
	})
]);


/*
SELECT
	movies.*,
	COUNT(reviews_1.*) AS positive_review_count
FROM movies
JOIN
	reviews AS reviews_1 ON movies.id = reviews_1.movie_id
WHERE reviews_1.rating > 3
GROUP BY movies.id;
*/
query = select("movies", [
	define({
		releases: has("releases.movie_id"),
		positive_reviews: has("reviews.movie_id", [
			where({ rating: moreThan(3) })
		])
	}),
	compute({ // better name for withDerived?
		positive_review_count: count("positive_reviews"),
		initial_release_year: lowestOf("releases.year")
	})
]);