core2026/packages/logic/test/diplomacy.test.ts

import { describe, expect, it } from 'vitest';
import { GAME_TICKS_PER_TURN } from '@sammo-ts/common';

import {
    DEFAULT_WAR_TERM,
    DIPLOMACY_STATE,
    processDiplomacyMonth,
    resolveDiplomacyMessageValidMinutes,
    resolveDiplomacyMessageValidUntilTick,
    type DiplomacyEntry,
} from '@sammo-ts/logic';

const buildEntry = (
    fromNationId: number,
    toNationId: number,
    state: number,
    term: number,
    dead = 0
): DiplomacyEntry => ({
    fromNationId,
    toNationId,
    state,
    term,
    dead,
    meta: {},
});

describe('diplomacy month processing', () => {
    it('promotes declaration to war after term expires', () => {
        const entries = [
            buildEntry(1, 2, DIPLOMACY_STATE.DECLARATION, 1),
            buildEntry(2, 1, DIPLOMACY_STATE.DECLARATION, 1),
        ];
        const result = processDiplomacyMonth(
            entries,
            new Map([
                [1, 1],
                [2, 1],
            ])
        );

        for (const entry of result) {
            expect(entry.state).toBe(DIPLOMACY_STATE.WAR);
            expect(entry.term).toBe(DEFAULT_WAR_TERM);
        }
    });

    it('ends war when both terms reach zero without casualties', () => {
        const entries = [buildEntry(1, 2, DIPLOMACY_STATE.WAR, 1), buildEntry(2, 1, DIPLOMACY_STATE.WAR, 1)];
        const result = processDiplomacyMonth(
            entries,
            new Map([
                [1, 1],
                [2, 1],
            ])
        );

        for (const entry of result) {
            expect(entry.state).toBe(DIPLOMACY_STATE.TRADE);
            expect(entry.term).toBe(0);
        }
    });

    it('extends war term based on accumulated casualties', () => {
        const entries = [buildEntry(1, 2, DIPLOMACY_STATE.WAR, 3, 400), buildEntry(2, 1, DIPLOMACY_STATE.WAR, 3, 0)];
        const result = processDiplomacyMonth(
            entries,
            new Map([
                [1, 2],
                [2, 2],
            ])
        );

        const forward = result.find((entry) => entry.fromNationId === 1 && entry.toNationId === 2);
        const reverse = result.find((entry) => entry.fromNationId === 2 && entry.toNationId === 1);
        expect(forward?.term).toBe(4);
        expect(forward?.dead).toBe(0);
        expect(reverse?.term).toBe(2);
    });

    it('expires non-aggression pact into trade', () => {
        const entries = [
            buildEntry(1, 2, DIPLOMACY_STATE.NON_AGGRESSION, 1),
            buildEntry(2, 1, DIPLOMACY_STATE.NON_AGGRESSION, 1),
        ];
        const result = processDiplomacyMonth(
            entries,
            new Map([
                [1, 1],
                [2, 1],
            ])
        );

        for (const entry of result) {
            expect(entry.state).toBe(DIPLOMACY_STATE.TRADE);
            expect(entry.term).toBe(0);
        }
    });

    it('decrements non-aggression exactly once per month and allows declaration only after the final month', () => {
        let entries = [
            buildEntry(1, 2, DIPLOMACY_STATE.NON_AGGRESSION, 3),
            buildEntry(2, 1, DIPLOMACY_STATE.NON_AGGRESSION, 3),
        ];
        const generalCounts = new Map([
            [1, 1],
            [2, 1],
        ]);

        entries = processDiplomacyMonth(entries, generalCounts);
        expect(entries.map(({ state, term }) => ({ state, term }))).toEqual([
            { state: DIPLOMACY_STATE.NON_AGGRESSION, term: 2 },
            { state: DIPLOMACY_STATE.NON_AGGRESSION, term: 2 },
        ]);
        entries = processDiplomacyMonth(entries, generalCounts);
        expect(entries.map(({ state, term }) => ({ state, term }))).toEqual([
            { state: DIPLOMACY_STATE.NON_AGGRESSION, term: 1 },
            { state: DIPLOMACY_STATE.NON_AGGRESSION, term: 1 },
        ]);
        entries = processDiplomacyMonth(entries, generalCounts);
        expect(entries.map(({ state, term }) => ({ state, term }))).toEqual([
            { state: DIPLOMACY_STATE.TRADE, term: 0 },
            { state: DIPLOMACY_STATE.TRADE, term: 0 },
        ]);
    });
});

describe('diplomacy message validity', () => {
    it('uses the same three-turn or 30-minute logical expiry for messages and NPC retry gates', () => {
        expect(resolveDiplomacyMessageValidMinutes(600)).toBe(30);
        expect(resolveDiplomacyMessageValidUntilTick(100, 600)).toBe(100 + GAME_TICKS_PER_TURN * 3);

        expect(resolveDiplomacyMessageValidMinutes(300)).toBe(30);
        expect(resolveDiplomacyMessageValidUntilTick(100, 300)).toBe(100 + GAME_TICKS_PER_TURN * 6);
    });
});