import { test } from 'node:test';
import assert from 'node:assert/strict';
import { Store } from '../src/store.js';
import { MS_PER_DAY } from '../src/pure.js';
import { createLocalStorage } from './localstorage-shim.js';

const DAY = MS_PER_DAY;
const NOW = 1_700_000_000_000;

function freshStore() {
  return new Store({ storage: createLocalStorage() });
}

test('Store: starts empty', () => {
  const s = freshStore();
  assert.equal(s.getTarget('strength'), null);
});

test('Store: setTarget validates via parseTarget', () => {
  const s = freshStore();
  assert.equal(s.setTarget('strength', '25M'), true);
  assert.equal(s.getTarget('strength'), 25_000_000);
});

test('Store: setTarget rejects invalid and keeps previous', () => {
  const s = freshStore();
  s.setTarget('strength', 25_000_000);
  assert.equal(s.setTarget('strength', 'abc'), false);
  assert.equal(s.getTarget('strength'), 25_000_000);
});

test('Store: targets are per-attribute', () => {
  const s = freshStore();
  s.setTarget('strength', 25_000_000);
  s.setTarget('speed', 50_000_000);
  assert.equal(s.getTarget('strength'), 25_000_000);
  assert.equal(s.getTarget('speed'), 50_000_000);
});

test('Store: persists across instances via storage', () => {
  const storage = createLocalStorage();
  const a = new Store({ storage });
  a.setTarget('strength', 25_000_000);
  const b = new Store({ storage });
  assert.equal(b.getTarget('strength'), 25_000_000);
});

test('Store: corrupted JSON is wiped with a warning', () => {
  const storage = createLocalStorage();
  storage.setItem('tat.targets', '{not json');
  const warnings = [];
  const s = new Store({ storage, onWarn: (m) => warnings.push(m) });
  assert.equal(s.getTarget('strength'), null);
  assert.equal(warnings.length, 1);
  assert.equal(storage.getItem('tat.targets'), null);
  const warningsBefore = warnings.length;
  new Store({ storage, onWarn: (m) => warnings.push(m) });
  assert.equal(warnings.length, warningsBefore);
});

test('Store: latches off further saves after a storage write failure', () => {
  const data = new Map();
  const throwingStorage = {
    getItem(k) { return data.has(k) ? data.get(k) : null; },
    setItem() { throw new Error('quota exceeded'); },
    removeItem(k) { data.delete(k); },
    clear() { data.clear(); },
  };
  const warnings = [];
  const s = new Store({ storage: throwingStorage, onWarn: (m) => warnings.push(m) });
  assert.equal(s.setTarget('strength', 25_000_000), false);
  assert.equal(s.setTarget('speed', 50_000_000), false);
  assert.equal(warnings.length, 1);
  assert.equal(s.getTarget('strength'), 25_000_000);
  assert.equal(s.getTarget('speed'), 50_000_000);
});

test('Store: recordTrain appends to per-attribute history', () => {
  const s = freshStore();
  s.recordTrain('strength', 247, NOW);
  s.recordTrain('strength', 250, NOW - 1000);
  assert.equal(s.history.strength.length, 2);
  assert.equal(s.history.strength[0].delta, 247);
});

test('Store: recordTrain prunes entries older than 30 days', () => {
  const s = freshStore();
  s.recordTrain('strength', 100, NOW - 31 * DAY);
  s.recordTrain('strength', 200, NOW);
  assert.equal(s.history.strength.length, 1);
  assert.equal(s.history.strength[0].delta, 200);
});

test('Store: getSummary returns computed summary for attribute', () => {
  const s = freshStore();
  s.recordTrain('strength', 247, NOW - 1000);
  s.recordTrain('strength', 247, NOW - 2000);
  const sum = s.getSummary('strength', NOW);
  assert.equal(sum.trainsToday, 2);
  assert.equal(sum.perDay, Math.floor((2 / 7) * 247));
});

test('Store: recordTrain rejects non-positive and non-number deltas', () => {
  const s = freshStore();
  assert.equal(s.recordTrain('strength', 0, NOW), false);
  assert.equal(s.recordTrain('strength', -5, NOW), false);
  assert.equal(s.recordTrain('strength', '10', NOW), false);
  assert.equal(s.recordTrain('strength', NaN, NOW), false);
  assert.equal(s.history.strength, undefined);
});

test('Store: getSummary on unknown attribute returns zeros', () => {
  const s = freshStore();
  const sum = s.getSummary('nonexistent', NOW);
  assert.equal(sum.trainsToday, 0);
  assert.equal(sum.sevenDayAvgPerDay, 0);
  assert.equal(sum.perDay, 0);
});