genChapter4

src/lib/store/genNextBattle.js

@@ -102,6 +102,32 @@ export function genChapter3Battle(battles) {
 	};
 }
 
+export function genChapter4Battle(battles) {
+	const chapter = 4;
+
+	const scenario = 'The Last Battle';
+
+	const cities = R.difference(
+		battles
+			.slice(0, 6)
+			.filter(({ status }) => status !== 'lost')
+			.map(R.prop('city')),
+		battles.slice(6).map((b) => b.city.selection),
+	);
+
+	const characters = battles.slice(0, 6).map(R.prop('character'));
+
+	return {
+		scenario,
+		city: { choices: cities, selection: R.first(cities) },
+		status: 'ongoing',
+		additionalCharacters: R.range(0, 3).map((i) => ({
+			choices: characters,
+			selection: characters[i],
+		})),
+	};
+}
+
 export function genNextBattle(battles = []) {
 	let chapter = R.clamp(1 + parseInt(battles.length / 2), { min: 1, max: 4 });
 
@@ -110,4 +136,6 @@ export function genNextBattle(battles = []) {
 	if (chapter === 2) return genChapter2Battle(battles);
 
 	if (chapter === 3) return genChapter3Battle(battles);
+
+	return genChapter4Battle(battles);
 }

src/lib/store/genNextBattle.test.js

@@ -4,6 +4,7 @@ import {
 	genNextBattle,
 	genChapter2Battle,
 	genChapter3Battle,
+	genChapter4Battle,
 } from './genNextBattle.js';
 
 test('generate for the first chapter', () => {
@@ -66,3 +67,20 @@ test('chapter 3, second battle', () => {
 	expect(result.additionalCharacters[0].selection).toEqual('two');
 	expect(result.additionalCharacters[1].selection).toEqual('four');
 });
+
+test.only('chapter 4, first battle', () => {
+	const result = genChapter4Battle([
+		{ character: 'one', city: 'a' },
+		{ character: 'two', city: 'b', status: 'lost' },
+		{ character: 'three', city: 'c' },
+		{ character: 'four', city: 'd' },
+		{ character: 'five', city: 'e' },
+		{ character: 'six', city: 'f' },
+	]);
+
+	expect(result.additionalCharacters[0].selection).toEqual('one');
+	expect(result.additionalCharacters[1].selection).toEqual('two');
+	expect(result.additionalCharacters[2].selection).toEqual('three');
+
+	expect(result.city.choices).not.toContain('b');
+});