import { assert, assertEquals } from "@std/assert";
import { clock, CYCLE_TICKS, DAY_TICKS, daylight, format_clock, is_day, NIGHT_TICKS } from "$/common/time.ts";
import { test_game } from "./helpers.ts";

Deno.test("a day is 30 minutes and a night 10, tick 0 is 06:00 of day 1", () => {
	assertEquals(DAY_TICKS, 30 * 60 * 20);
	assertEquals(NIGHT_TICKS, 10 * 60 * 20);
	assertEquals(format_clock(0), "Day 1, 06:00");
	assertEquals(format_clock(DAY_TICKS / 2), "Day 1, 12:00");
	assertEquals(format_clock(DAY_TICKS), "Day 1, 18:00");
	// midnight is halfway through the night, and the day number goes up there
	assertEquals(format_clock(DAY_TICKS + NIGHT_TICKS / 2 - 1), "Day 1, 23:59");
	assertEquals(format_clock(DAY_TICKS + NIGHT_TICKS / 2), "Day 2, 00:00");
	assertEquals(format_clock(CYCLE_TICKS), "Day 2, 06:00");
	assertEquals(clock(3 * CYCLE_TICKS + DAY_TICKS / 4), { day: 4, hour: 9, minute: 0 });
	assert(is_day(DAY_TICKS - 1) && !is_day(DAY_TICKS) && is_day(CYCLE_TICKS));
});

Deno.test("it's bright all day, dark in the middle of the night, and fades in between", () => {
	assertEquals(daylight(0), 1);
	assertEquals(daylight(DAY_TICKS - 1), 1);
	assertEquals(daylight(DAY_TICKS + NIGHT_TICKS / 2), 0);
	const dusk = daylight(DAY_TICKS + 600);
	const dawn = daylight(CYCLE_TICKS - 600);
	assert(dusk > 0 && dusk < 1 && Math.abs(dusk - dawn) < 1e-9, `dusk ${dusk}, dawn ${dawn}`);
	// smooth between ticks too
	assert(daylight(DAY_TICKS + 600.5) < dusk);
});

Deno.test("the server keeps the time, tells players, saves it, and /time changes it", async () => {
	const { game, join, take, send } = await test_game("mods");
	assertEquals(join(1, "alice").time, 0);

	for (let i = 0; i < 40; i++) game.tick();
	assertEquals(take(1).filter((m) => m.type === "time").map((m) => m.time), [20, 40]);

	send(1, { type: "chat", text: "/time" });
	assertEquals(take(1).find((m) => m.type === "chat").text, "Day 1, 06:00 (tick 40)");

	send(1, { type: "chat", text: "/time set midnight" });
	let messages = take(1);
	assertEquals(messages.find((m) => m.type === "time").time, DAY_TICKS + NIGHT_TICKS / 2);
	assert(messages.some((m) => m.text === "alice set the time to Day 2, 00:00"));

	// named times are the next one, so time never goes backwards
	send(1, { type: "chat", text: "/time set day" });
	assertEquals(game.world.time, CYCLE_TICKS);
	send(1, { type: "chat", text: "/time add 100" });
	assertEquals(game.world.time, CYCLE_TICKS + 100);
	send(1, { type: "chat", text: "/time set nope" });
	messages = take(1);
	assert(messages.at(-1).text.startsWith("Usage: /time"));

	const loaded = await test_game("mods", game.save());
	assertEquals(loaded.game.world.time, CYCLE_TICKS + 100);
	assertEquals(loaded.join(1, "alice").time, CYCLE_TICKS + 100);
});