// Unit tests for the SEA (naval / sea control) ability (v0.43.0, #65) — the
// modular, DURABLE LLM-ability that gives nations sole control over a fixed
// set of 12 named sea zones: the zone is upserted in `GameState.seaZones`
// (replace in place, contest by higher current military), and every committed
// turn the controller earns a deterministic +1 military / +1 economy bonus
// (clamped, mirrored to its regions, re-derived). The layer never touches
// `territory` / `unowned` — it is fully parallel to but independent of land.
// This is the ability's own test file (the registry's cross-cutting
// guarantees — order, distinct fields, the system/user goldens — are covered
// by ./registry.test.ts). The stub never proposes a sea op, so the apply path
// is exercised here, not by the e2e suite.

import { describe, expect, it } from 'vitest';

import {
  SEA_ZONES,
  SEA_ZONE_IDS,
  applySeaControl,
  applySeaZoneBonuses,
  isSeaZoneId,
  sea,
  seaZoneName,
  validateSeaOps,
} from './sea';

import type {
  GameState,
  Nation,
  NationStats,
  RegionStats,
  SeaZoneClaim,
} from '../../shared/types';

// ---------------------------------------------------------------------------
// Fixture helpers
// ---------------------------------------------------------------------------

/** Build a NationStats from the four canonical indices (military, economy, stability, population). */
function NS(military: number, economy: number, stability: number, population: number): NationStats {
  return { military, economy, stability, population };
}

/** Build a RegionStats from the four canonical indices. */
function RS(military: number, economy: number, stability: number, population: number): RegionStats {
  return { military, economy, stability, population };
}

/** A minimal nation: the given id/name/stats/region-key territory. */
function mkNation(
  id: string,
  name: string,
  stats: NationStats,
  territory: string[],
): Nation {
  return { id, name, type: 'major', stats, territory, relations: {} };
}

/**
 * A minimal GameState carrying the given nations (keyed by id), per-region
 * stats, and an optional existing sea-zone list. Every other required field
 * is at its fresh-game baseline.
 */
function mkState(
  nations: Record<string, Nation>,
  regionStats: Record<string, RegionStats>,
  seaZones: SeaZoneClaim[] = [],
): GameState {
  return {
    id: 'g1',
    presetId: 'test',
    presetTitle: 'Test',
    playerNationId: Object.keys(nations)[0] ?? 'a1',
    turn: 1,
    date: '1939-09-01',
    nations,
    events: [],
    pending: [],
    version: 1,
    unowned: [],
    pendingNationOps: [],
    markers: [],
    regionStats,
    wars: [],
    trades: [],
    embargoes: [],
    industry: [],
    seaZones,
  };
}

// ---------------------------------------------------------------------------
// SEA_ZONES / isSeaZoneId / seaZoneName
// ---------------------------------------------------------------------------

describe('SEA_ZONES / SEA_ZONE_IDS / isSeaZoneId / seaZoneName', () => {
  it('exposes exactly the 12 fixed sea zones', () => {
    expect(SEA_ZONES).toHaveLength(12);
    const ids = SEA_ZONES.map((z) => z.id);
    expect(ids).toEqual([
      'north-atlantic',
      'south-atlantic',
      'pacific',
      'indian',
      'mediterranean',
      'north-sea',
      'baltic',
      'arctic',
      'black-sea',
      'gulf-mexico',
      'red-sea',
      'sargasso',
    ]);
  });

  it('SEA_ZONE_IDS is a ReadonlySet of all 12 ids', () => {
    expect(SEA_ZONE_IDS).toBeInstanceOf(Set);
    expect(SEA_ZONE_IDS.size).toBe(12);
    for (const z of SEA_ZONES) expect(SEA_ZONE_IDS.has(z.id)).toBe(true);
  });

  it('isSeaZoneId accepts each known id and rejects unknown / non-strings', () => {
    for (const z of SEA_ZONES) expect(isSeaZoneId(z.id)).toBe(true);
    expect(isSeaZoneId('atlantic-ocean')).toBe(false);
    expect(isSeaZoneId('')).toBe(false);
  });

  it('seaZoneName returns the human-readable name; an unknown id is returned raw', () => {
    expect(seaZoneName('pacific')).toBe('Pacific Ocean');
    expect(seaZoneName('mediterranean')).toBe('Mediterranean Sea');
    expect(seaZoneName('nope')).toBe('nope');
  });
});

// ---------------------------------------------------------------------------
// validateSeaOps
// ---------------------------------------------------------------------------

describe('validateSeaOps', () => {
  it('accepts the { control: [...] } object shape and a bare array', () => {
    const op = { zone: 'pacific', by: 'a1' };
    expect(validateSeaOps({ control: [op] })).toEqual({ control: [op] });
    expect(validateSeaOps([op])).toEqual({ control: [op] });
  });

  it('drops an op with an unknown / missing zone', () => {
    expect(validateSeaOps([{ zone: 'nope', by: 'a1' }])).toEqual({ control: [] });
    expect(validateSeaOps([{ by: 'a1' }])).toEqual({ control: [] });
    expect(validateSeaOps([{ zone: '', by: 'a1' }])).toEqual({ control: [] });
  });

  it('drops an op with an empty / missing `by` (the controller)', () => {
    expect(validateSeaOps([{ zone: 'pacific', by: '' }])).toEqual({ control: [] });
    expect(validateSeaOps([{ zone: 'pacific' }])).toEqual({ control: [] });
  });

  it('drops a non-object entry', () => {
    expect(validateSeaOps([42, 'nope', null, { zone: 'pacific', by: 'a1' }])).toEqual({
      control: [{ zone: 'pacific', by: 'a1' }],
    });
  });

  it('a missing / malformed top-level value yields { control: [] }', () => {
    expect(validateSeaOps(undefined)).toEqual({ control: [] });
    expect(validateSeaOps(null)).toEqual({ control: [] });
    expect(validateSeaOps('nope')).toEqual({ control: [] });
    expect(validateSeaOps({ control: 'nope' })).toEqual({ control: [] });
  });

  it('caps `zone` at 100 and `by` at 200 chars', () => {
    const longBy = 'f'.repeat(500);
    const out = validateSeaOps([{ zone: 'pacific', by: longBy }]);
    expect(out.control).toHaveLength(1);
    expect(out.control[0].by).toHaveLength(200);
  });
});

// ---------------------------------------------------------------------------
// applySeaControl
// ---------------------------------------------------------------------------

describe('applySeaControl', () => {
  it('a single op sets a new zone claim', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(80, 70, 60, 50), ['a-r1']) },
      { 'a-r1': RS(80, 70, 60, 50) },
    );
    applySeaControl(state, [{ zone: 'pacific', by: 'a1' }]);
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'a1' }]);
  });

  it('replaces an existing claim in place (position preserved)', () => {
    const state = mkState(
      {
        a1: mkNation('a1', 'Alpha', NS(80, 70, 60, 50), ['a-r1']),
        b2: mkNation('b2', 'Bravo', NS(90, 40, 20, 30), ['b-r1']),
      },
      { 'a-r1': RS(80, 70, 60, 50), 'b-r1': RS(90, 40, 20, 30) },
      [
        { zone: 'pacific', by: 'a1' },
        { zone: 'indian', by: 'b2' },
      ],
    );
    // b2 now claims pacific — the pacific claim moves to b2 but stays at index 0
    applySeaControl(state, [{ zone: 'pacific', by: 'b2' }]);
    expect(state.seaZones).toEqual([
      { zone: 'pacific', by: 'b2' },
      { zone: 'indian', by: 'b2' },
    ]);
  });

  it('appends a new zone after existing claims', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(80, 70, 60, 50), ['a-r1']) },
      { 'a-r1': RS(80, 70, 60, 50) },
      [{ zone: 'pacific', by: 'a1' }],
    );
    applySeaControl(state, [{ zone: 'arctic', by: 'a1' }]);
    expect(state.seaZones).toEqual([
      { zone: 'pacific', by: 'a1' },
      { zone: 'arctic', by: 'a1' },
    ]);
  });

  it('a contest: the higher current military wins', () => {
    const state = mkState(
      {
        a1: mkNation('a1', 'Alpha', NS(80, 70, 60, 50), ['a-r1']),
        b2: mkNation('b2', 'Bravo', NS(90, 40, 20, 30), ['b-r1']),
      },
      { 'a-r1': RS(80, 70, 60, 50), 'b-r1': RS(90, 40, 20, 30) },
    );
    // b2 has higher military (90 > 80) → b2 wins
    applySeaControl(state, [
      { zone: 'pacific', by: 'a1' },
      { zone: 'pacific', by: 'b2' },
    ]);
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'b2' }]);
  });

  it('a contest tie: the earlier-listed op wins', () => {
    const state = mkState(
      {
        a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), ['a-r1']),
        b2: mkNation('b2', 'Bravo', NS(50, 50, 50, 50), ['b-r1']),
      },
      { 'a-r1': RS(50, 50, 50, 50), 'b-r1': RS(50, 50, 50, 50) },
    );
    // equal military (50 == 50) → a1 wins (listed first)
    applySeaControl(state, [
      { zone: 'pacific', by: 'a1' },
      { zone: 'pacific', by: 'b2' },
    ]);
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'a1' }]);
  });

  it('two ops for the same nation on the same zone: a single claim (no contest)', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(80, 70, 60, 50), ['a-r1']) },
      { 'a-r1': RS(80, 70, 60, 50) },
    );
    applySeaControl(state, [
      { zone: 'pacific', by: 'a1' },
      { zone: 'pacific', by: 'a1' },
    ]);
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'a1' }]);
  });

  it('resolves `by` by unique name (not just id)', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(80, 70, 60, 50), ['a-r1']) },
      { 'a-r1': RS(80, 70, 60, 50) },
    );
    applySeaControl(state, [{ zone: 'pacific', by: 'Alpha' }]);
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'a1' }]);
  });

  it('an unresolvable `by` is dropped; if all ops on a zone drop, the zone is untouched', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(80, 70, 60, 50), ['a-r1']) },
      { 'a-r1': RS(80, 70, 60, 50) },
      [{ zone: 'pacific', by: 'a1' }],
    );
    // ghost does not exist → dropped; pacific stays as a1
    applySeaControl(state, [{ zone: 'pacific', by: 'ghost' }]);
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'a1' }]);

    // a NEW zone with only an unresolvable op → zone not added
    applySeaControl(state, [{ zone: 'arctic', by: 'ghost' }]);
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'a1' }]);
  });

  it('an ambiguous name (two nations share it) drops the op', () => {
    const state = mkState(
      {
        a1: mkNation('a1', 'Twin', NS(80, 70, 60, 50), ['a-r1']),
        a2: mkNation('a2', 'Twin', NS(20, 20, 20, 20), ['a-r2']),
      },
      { 'a-r1': RS(80, 70, 60, 50), 'a-r2': RS(20, 20, 20, 20) },
    );
    applySeaControl(state, [{ zone: 'pacific', by: 'Twin' }]);
    // ambiguous → dropped
    expect(state.seaZones).toEqual([]);
  });

  it('never touches `territory` or `unowned`', () => {
    const state = mkState(
      {
        a1: mkNation('a1', 'Alpha', NS(80, 70, 60, 50), ['a-r1']),
        b2: mkNation('b2', 'Bravo', NS(90, 40, 20, 30), ['b-r1']),
      },
      { 'a-r1': RS(80, 70, 60, 50), 'b-r1': RS(90, 40, 20, 30) },
    );
    applySeaControl(state, [
      { zone: 'pacific', by: 'a1' },
      { zone: 'pacific', by: 'b2' },
    ]);
    expect(state.nations.a1.territory).toEqual(['a-r1']);
    expect(state.nations.b2.territory).toEqual(['b-r1']);
    expect(state.unowned).toEqual([]);
  });
});

// ---------------------------------------------------------------------------
// applySeaZoneBonuses
// ---------------------------------------------------------------------------

describe('applySeaZoneBonuses', () => {
  it('a controller earns +1 military and +1 economy (clamped, mirrored, re-derived)', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), ['a-r1']) },
      { 'a-r1': RS(50, 50, 50, 50) },
      [{ zone: 'pacific', by: 'a1' }],
    );
    applySeaZoneBonuses(state);
    // +1 to both military and economy, mirrored to the region, re-derived
    // (single region → re-derive gives back the region's value)
    expect(state.nations.a1.stats).toEqual(NS(51, 51, 50, 50));
    expect(state.regionStats['a-r1']).toEqual(RS(51, 51, 50, 50));
  });

  it('clamps to 0 and 100', () => {
    // military at 99 → 100; economy at 1 → 2
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(99, 1, 50, 50), ['a-r1']) },
      { 'a-r1': RS(99, 1, 50, 50) },
      [{ zone: 'pacific', by: 'a1' }],
    );
    applySeaZoneBonuses(state);
    expect(state.nations.a1.stats.military).toBe(100);
    expect(state.nations.a1.stats.economy).toBe(2);
  });

  it('a nation controlling several zones stacks the bonus', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), ['a-r1']) },
      { 'a-r1': RS(50, 50, 50, 50) },
      [
        { zone: 'pacific', by: 'a1' },
        { zone: 'indian', by: 'a1' },
      ],
    );
    applySeaZoneBonuses(state);
    // +2 to both (one per zone)
    expect(state.nations.a1.stats).toEqual(NS(52, 52, 50, 50));
  });

  it('a 0-region nation keeps its directly-mutated stats (no re-derive)', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), []) },
      {},
      [{ zone: 'pacific', by: 'a1' }],
    );
    applySeaZoneBonuses(state);
    // direct mutation, no re-derive (no regions)
    expect(state.nations.a1.stats).toEqual(NS(51, 51, 50, 50));
  });

  it('a stale controller (nation no longer in `nations`) is skipped; the claim is kept', () => {
    // Build a state where the claim references a nation id that is not in `nations`
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), ['a-r1']) },
      { 'a-r1': RS(50, 50, 50, 50) },
      [{ zone: 'pacific', by: 'ghost' }],
    );
    applySeaZoneBonuses(state);
    // ghost is not in nations → skipped; a1 is unaffected
    expect(state.nations.a1.stats).toEqual(NS(50, 50, 50, 50));
    // the claim is kept (not removed)
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'ghost' }]);
  });

  it('an empty seaZones list is a no-op', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), ['a-r1']) },
      { 'a-r1': RS(50, 50, 50, 50) },
      [],
    );
    applySeaZoneBonuses(state);
    expect(state.nations.a1.stats).toEqual(NS(50, 50, 50, 50));
  });

  it('never touches `territory` or `unowned`', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), ['a-r1']) },
      { 'a-r1': RS(50, 50, 50, 50) },
      [{ zone: 'pacific', by: 'a1' }],
    );
    applySeaZoneBonuses(state);
    expect(state.nations.a1.territory).toEqual(['a-r1']);
    expect(state.unowned).toEqual([]);
  });
});

// ---------------------------------------------------------------------------
// The Ability object contract
// ---------------------------------------------------------------------------

describe('sea ability', () => {
  it('owns the "sea" field; default() is a fresh empty { control: [] }', () => {
    expect(sea.field).toBe('sea');
    expect(sea.default()).toEqual({ control: [] });
    expect(sea.default()).not.toBe(sea.default());
  });

  it('default() is not meaningful; a populated value is', () => {
    expect(sea.isMeaningful(sea.default())).toBe(false);
    expect(sea.isMeaningful({ control: [{ zone: 'pacific', by: 'a1' }] })).toBe(true);
  });

  it('validate() wraps the validator into the SeaOps shape', () => {
    expect(sea.validate([{ zone: 'pacific', by: 'a1' }])).toEqual({
      control: [{ zone: 'pacific', by: 'a1' }],
    });
    expect(sea.validate(undefined)).toEqual({ control: [] });
  });

  it('the stub value equals default() (the stub never proposes a sea op)', () => {
    expect(sea.stub()).toEqual({ control: [] });
  });

  it('stateFields is [seaZones] (the durable GameState field)', () => {
    expect(sea.stateFields).toEqual(['seaZones']);
  });

  it('payload() emits seaZones (even when empty / undefined)', () => {
    expect(sea.payload({ seaZones: [] } as never)).toEqual({ seaZones: [] });
    expect(sea.payload({} as never)).toEqual({ seaZones: [] });
    expect(sea.payload({ seaZones: [{ zone: 'pacific', by: 'a1' }] } as never)).toEqual({
      seaZones: [{ zone: 'pacific', by: 'a1' }],
    });
  });

  it('apply() runs the ops then the per-turn bonus (no throw on a bad ref)', () => {
    const state = mkState(
      {
        a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), ['a-r1']),
        b2: mkNation('b2', 'Bravo', NS(80, 40, 20, 30), ['b-r1']),
      },
      { 'a-r1': RS(50, 50, 50, 50), 'b-r1': RS(80, 40, 20, 30) },
    );
    const ctx = { previous: state, actingTurn: state.turn };
    sea.apply(
      state,
      {
        control: [
          { zone: 'pacific', by: 'a1' },
          { zone: 'pacific', by: 'b2' },
          // an unresolvable ref — must be dropped, not throw
          { zone: 'arctic', by: 'ghost' },
        ],
      },
      ctx,
    );
    // contest: b2 (military 80) beats a1 (military 50) → b2 controls pacific
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'b2' }]);
    // b2 gets the +1/+1 bonus (it controls pacific)
    expect(state.nations.b2.stats).toEqual(NS(81, 41, 20, 30));
    // a1 is unaffected
    expect(state.nations.a1.stats).toEqual(NS(50, 50, 50, 50));
  });

  it('apply() with an empty control still applies the per-turn bonus to existing claims', () => {
    const state = mkState(
      { a1: mkNation('a1', 'Alpha', NS(50, 50, 50, 50), ['a-r1']) },
      { 'a-r1': RS(50, 50, 50, 50) },
      [{ zone: 'pacific', by: 'a1' }],
    );
    const ctx = { previous: state, actingTurn: state.turn };
    sea.apply(state, { control: [] }, ctx);
    // no new claims, but the existing claim's controller earns the bonus
    expect(state.seaZones).toEqual([{ zone: 'pacific', by: 'a1' }]);
    expect(state.nations.a1.stats).toEqual(NS(51, 51, 50, 50));
  });
});