import {Suite, expect} from "cynic"

import {Reactor} from "./reactor.js"
import {Flat} from "../flatstate/flat.js"
import {SignalTower} from "../signals/tower.js"

function setup() {
	return new Reactor(
		new Flat(),
		new SignalTower(),
	)
}

export default <Suite>{
	"two-function syntax": {
		"reactor reacts to flatstate changes": async() => {
			const reactor = setup()
			const state = reactor.flat.state({alpha: 0})
			let calls = 0

			reactor.reaction(
				() => void state.alpha,
				() => calls++,
			)

			state.alpha++
			await reactor.wait
			expect(calls).equals(1)
		},
		"reactor reacts to signal changes": async() => {
			const reactor = setup()
			const bravo = reactor.signals.signal(0)
			let calls = 0

			reactor.reaction(
				() => void bravo.value,
				() => calls++,
			)

			bravo.value++
			await reactor.wait
			expect(calls).equals(1)
		},
		"flatstate and signal changes are debounced": async() => {
			const reactor = setup()
			const state = reactor.flat.state({alpha: 0})
			const bravo = reactor.signals.signal(0)
			let calls = 0

			reactor.reaction(
				() => void bravo.value,
				() => calls++,
			)

			state.alpha++
			bravo.value++
			await reactor.wait
			expect(calls).equals(1)
		},
		"reaction can be stopped": async() => {
			const reactor = setup()
			const state = reactor.flat.state({alpha: 0})
			const bravo = reactor.signals.signal(0)
			let calls = 0

			const stop = reactor.reaction(
				() => void bravo.value,
				() => calls++,
			)

			stop()
			state.alpha++
			bravo.value++
			await reactor.wait
			expect(calls).equals(0)
		},
	},
	"one-function syntax": {
		"reactor reacts to flatstate changes": async() => {
			const reactor = setup()
			const state = reactor.flat.state({alpha: 0})
			let calls = 0

			reactor.reaction(() => {
				void state.alpha
				calls++
			})
			expect(calls).equals(1)

			state.alpha++
			await reactor.wait
			expect(calls).equals(2)
		},
		"reactor reacts to signal changes": async() => {
			const reactor = setup()
			const bravo = reactor.signals.signal(0)
			let calls = 0

			reactor.reaction(() => {
				void bravo.value
				calls++
			})
			expect(calls).equals(1)

			bravo.value++
			await reactor.wait
			expect(calls).equals(2)
		},
		"flatstate and signal changes are debounced": async() => {
			const reactor = setup()
			const state = reactor.flat.state({alpha: 0})
			const bravo = reactor.signals.signal(0)
			let calls = 0

			reactor.reaction(() => {
				void bravo.value
				calls++
			})
			expect(calls).equals(1)

			state.alpha++
			bravo.value++
			await reactor.wait
			expect(calls).equals(2)
		},
		"reaction can be stopped": async() => {
			const reactor = setup()
			const state = reactor.flat.state({alpha: 0})
			const bravo = reactor.signals.signal(0)
			let calls = 0

			const stop = reactor.reaction(() => {
				void bravo.value
				calls++
			})
			expect(calls).equals(1)

			stop()
			state.alpha++
			bravo.value++
			await reactor.wait
			expect(calls).equals(1)
		},
	},
}