import { test } from 'node:test';
import assert from 'node:assert/strict';
import { createInitialState, reduce, getLegalIntents, isPlayersTurn } from './game.js';
import { board } from './board.js';
import { rollsNeededFor } from './tileEffects.js';

function join(state, playerId, name, seat) {
  return reduce(state, { type: 'JOIN', playerId, name, seat, color: '#000' });
}

// Deterministic dummy rolls — always the low end of each die's range, so
// these tests exercise the reducer's mechanics without depending on real
// (or synthesized-placeholder) table content. shared/tileEffects.test.js
// covers the actual banding/effect math.
function rollsFor(space) {
  return rollsNeededFor(space).map(() => 1);
}

function takeTurn(state, playerId) {
  const player = state.players[playerId];
  if (player.pendingChoice) {
    const spaceId = player.pendingChoice.options[0];
    return reduce(state, { type: 'CHOOSE', playerId, spaceId, rolls: rollsFor(board.spaces[spaceId]) });
  }
  const nextSpaceId = board.spaces[player.position].next;
  return reduce(state, { type: 'ROLL', playerId, rolls: rollsFor(board.spaces[nextSpaceId]) });
}

test('lobby: join validation', () => {
  let state = createInitialState();
  state = join(state, 'p1', 'Alice', 1);
  assert.throws(() => join(state, 'p1', 'Alice again', 2), /already joined/);
  assert.throws(() => join(state, 'p2', 'Bob', 1), /Seat already taken/);
  assert.throws(() => reduce(state, { type: 'START_GAME' }), /Not enough players/);
});

test('join gives every player the five starting stats', () => {
  let state = createInitialState();
  state = join(state, 'p1', 'Alice', 1);
  const p1 = state.players.p1;
  assert.deepEqual(
    { cash: p1.cash, love: p1.love, education: p1.education, wealth: p1.wealth, age: p1.age },
    state.config.startingStats
  );
});

test('turn order and illegal actions', () => {
  let state = createInitialState();
  state = join(state, 'p1', 'Alice', 1);
  state = join(state, 'p2', 'Bob', 2);
  state = reduce(state, { type: 'START_GAME' });

  assert.equal(state.status, 'active');
  assert.deepEqual(state.turnOrder, ['p1', 'p2']);
  assert.equal(state.currentTurn, 'p1');
  assert.equal(isPlayersTurn(state, 'p1'), true);
  assert.equal(isPlayersTurn(state, 'p2'), false);
  assert.deepEqual(getLegalIntents(state, 'p1'), ['REQUEST_ROLL']);
  assert.deepEqual(getLegalIntents(state, 'p2'), []);

  assert.throws(() => reduce(state, { type: 'ROLL', playerId: 'p2', rolls: [] }), /Not your turn/);
  assert.throws(() => reduce(state, { type: 'CHOOSE', playerId: 'p1', spaceId: 'anything' }), /No pending choice/);
});

test('a single roll advances exactly one tile and applies its effect', () => {
  let state = createInitialState();
  state = join(state, 'p1', 'Alice', 1);
  state = join(state, 'p2', 'Bob', 2);
  state = reduce(state, { type: 'START_GAME' });

  const expectedNext = board.spaces[board.startSpaceId].next;
  state = takeTurn(state, 'p1');
  assert.equal(state.players.p1.position, expectedNext);
  assert.equal(state.currentTurn, 'p2', 'turn advances since no choice is pending yet');
  assert.equal(state.log.at(-1).landedOn, expectedNext);
});

test('full board: walking every tile to the temporary finish never crashes and always terminates', () => {
  let state = createInitialState();
  state = join(state, 'p1', 'Alice', 1);
  state = join(state, 'p2', 'Bob', 2);
  state = reduce(state, { type: 'START_GAME' });

  const seenTypes = new Set();
  let guard = 0;
  while (state.status === 'active') {
    if (++guard > 1000) throw new Error('game did not finish in a reasonable number of turns');
    const turnPlayerId = state.currentTurn;
    state = takeTurn(state, turnPlayerId);
    const after = state.players[turnPlayerId];
    seenTypes.add(board.spaces[after.position].type);
    for (const stat of ['cash', 'love', 'education', 'wealth', 'age']) {
      assert.equal(typeof after[stat], 'number', `${stat} stays numeric`);
    }
    assert.ok(board.spaces[after.position], 'player is always on a real space');
  }

  assert.equal(state.status, 'finished');
  assert.ok(state.winnerId);
  assert.equal(state.currentTurn, null);
  assert.equal(state.players[state.winnerId].position, 'finish');
  assert.deepEqual(getLegalIntents(state, 'p1'), []);

  // Every distinct tile type in the real board actually got resolved along the way.
  for (const type of [
    'payday', 'action_space', 'dice_space', 'roll_table_ref',
    'inline_table', 'cash_bonus', 'event', 'choice', 'stop',
  ]) {
    assert.ok(seenTypes.has(type), `expected to land on a "${type}" tile during a full playthrough`);
  }

  assert.throws(() => reduce(state, { type: 'ROLL', playerId: 'p1', rolls: [] }), /not active/);
});

test('board graph is well-formed', () => {
  const ids = Object.keys(board.spaces);
  assert.equal(ids.length, 212, '211 real tiles + 1 synthetic finish');
  let nonFinishCount = 0;
  for (const id of ids) {
    const space = board.spaces[id];
    if (space.type === 'finish') {
      assert.equal(space.next, undefined);
      continue;
    }
    nonFinishCount++;
    assert.ok(board.spaces[space.next], `${id} -> missing ${space.next}`);
  }
  assert.equal(nonFinishCount, 211);
});