import { describe, expect, test } from "bun:test";
import { createDatabase, Database } from "../modules/database/src/index.ts";
import { Field } from "../modules/database/src/decorators/Field.ts";
import { Hydrate } from "../modules/database/src/decorators/Hydrate.ts";
import { Table } from "../modules/database/src/decorators/Table.ts";
import { encodeRow, hydrateRow } from "../modules/database/src/hydration.ts";

/**
 * Tests of the ORM: the fluent repository, the hydration of the rows and the
 * encoding of the values.
 */

@Table("users")
class User {
	@Field({ type: "text", primary: true })
	id: string;

	@Field({
		type: "text",
		unique: true,
		encode: (value: string) => value.trim().toLowerCase(),
	})
	email: string;

	@Field({
		type: "text",
		nullable: true,
		encode: (value: string | null) => value?.trim() ?? null,
		decode: (value: unknown) => (value === null ? null : String(value)),
	})
	name: string | null;

	@Field({ type: "int", default: 0 })
	age: number;

	@Hydrate({
		decode: (row) => `${String(row.email).split("@")[1] ?? ""}`,
	})
	domain: string;
}

async function database(): Promise<Database> {
	const db = createDatabase({ dialect: "sqlite", path: ":memory:" });
	db.model(User);
	await db.migrate();
	return db;
}

describe("orm", () => {
	test("creates the table of a model", async () => {
		const db = await database();
		const rows = await db
			.model(User)
			.query("SELECT name FROM sqlite_master WHERE type = 'table'");
		expect(rows).toHaveLength(1);
		await db.close();
	});

	test("inserts and reads a row", async () => {
		const db = await database();
		const users = db.model(User);

		const created = await users.create({
			id: "1",
			email: "ADA@Example.COM",
			name: "Ada",
			age: 36,
		});
		expect(created.id).toBe("1");

		const found = await users.where("id", "1").first();
		expect(found?.email).toBe("ada@example.com");
		expect(found?.name).toBe("Ada");
		await db.close();
	});

	test("encodes the values before the commit", async () => {
		const db = await database();
		const users = db.model(User);

		await users.create({
			id: "1",
			email: "ada@example.com",
			name: "  Ada  ",
			age: 36,
		});

		const rows = await users.query(
			"SELECT name, email FROM users WHERE id = '1'",
		);
		expect(rows[0]?.name).toBe("Ada");
		expect(rows[0]?.email).toBe("ada@example.com");
		await db.close();
	});

	test("hydrates the rows before they are read", async () => {
		const db = await database();
		const users = db.model(User);

		await users.create({
			id: "1",
			email: "ada@example.com",
			name: null,
			age: 36,
		});

		const found = await users.where("id", "1").first();
		expect(found?.domain).toBe("example.com");
		expect(found?.name).toBeNull();
		await db.close();
	});

	test("queries with conditions, order and limit", async () => {
		const db = await database();
		const users = db.model(User);

		for (const [index, name] of ["Ada", "Grace", "Alan"].entries()) {
			await users.create({
				id: String(index),
				email: `${name.toLowerCase()}@example.com`,
				name,
				age: 30 + index,
			});
		}

		expect(await users.count()).toBe(3);
		expect(await users.where("age", ">", 30).count()).toBe(2);
		expect((await users.orderBy("age", "desc").limit(1).all())[0]?.name).toBe(
			"Alan",
		);
		expect(
			await users
				.where([{ column: "name", operator: "=", value: "Ada" }])
				.count(),
		).toBe(1);
		await db.close();
	});

	test("updates and deletes rows", async () => {
		const db = await database();
		const users = db.model(User);

		await users.create({
			id: "1",
			email: "ada@example.com",
			name: "Ada",
			age: 36,
		});

		expect(await users.where("id", "1").update({ age: 37 })).toBe(1);
		expect((await users.where("id", "1").first())?.age).toBe(37);
		expect(await users.where("id", "1").delete()).toBe(1);
		expect(await users.count()).toBe(0);
		await db.close();
	});

	test("runs a transaction", async () => {
		const db = await database();
		const users = db.model(User);

		await db.transaction(async (tx) => {
			await tx.model(User).create({
				id: "1",
				email: "ada@example.com",
				name: "Ada",
				age: 36,
			});
		});

		expect(await users.count()).toBe(1);
		await db.close();
	});

	test("encodes and hydrates a row on its own", () => {
		const encoded = encodeRow<User>(User as never, {
			email: " A@B.COM ",
			name: " x ",
		});
		expect(encoded.email).toBe("a@b.com");
		expect(encoded.name).toBe("x");

		const hydrated = hydrateRow<User>(User as never, {
			id: "1",
			email: "ada@example.com",
			name: null,
			age: 36,
		});
		expect(hydrated.domain).toBe("example.com");
		expect(hydrated.name).toBeNull();
	});
});