import { describe, expect, it } from 'vitest';
import { chooseBotTurn } from './bot';
import { resolveTurn } from './resolve';
import { createGame } from './state';

function lcg(seed: number) {
	let s = seed >>> 0;
	return () => {
		s = (s * 1664525 + 1013904223) >>> 0;
		return s / 4294967296;
	};
}

describe('bot versus bot', () => {
	it('sixty duels end without errors and by death, not surrender', () => {
		let finished = 0;
		let byDeath = 0;
		let totalTurns = 0;
		for (let seed = 1; seed <= 60; seed++) {
			let state = createGame({ A: 'Black', B: 'White' }, seed);
			const rngA = lcg(seed * 7 + 1);
			const rngB = lcg(seed * 13 + 5);
			for (let turn = 0; turn < 80 && !state.over; turn++) {
				const a = chooseBotTurn(state, 'A', rngA);
				const b = chooseBotTurn(state, 'B', rngB);
				state = resolveTurn(state, { A: a, B: b });
			}
			if (state.over) {
				finished++;
				totalTurns += state.turn;
				if (!state.wizards.A.alive || !state.wizards.B.alive) byDeath++;
			}
			for (const w of Object.values(state.wizards)) {
				expect(w.hp).toBeGreaterThanOrEqual(0);
				expect(w.hp).toBeLessThanOrEqual(15);
			}
		}
		expect(finished).toBeGreaterThan(45);
		expect(byDeath).toBe(finished);
		expect(totalTurns / finished).toBeLessThan(40);
	}, 60000);
});